/* roulang page: index */
:root {
            --bg-primary: #0F0E0E;
            --bg-card: #1B1A1F;
            --bg-elevated: #232229;
            --text-primary: #F2F0E8;
            --text-secondary: #A8A6AD;
            --text-muted: #6E6C74;
            --accent-neon: #FF4D2E;
            --accent-gold: #F2B705;
            --accent-cyan: #2EE6D6;
            --border-subtle: #3A3942;
            --border-hover: #FF4D2E;
            --shadow-dark: rgba(0,0,0,0.45);
            --shadow-glow: rgba(255,77,46,0.35);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --spacing-section: 88px;
            --container-max: 1200px;
            --font-family-base: "PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
            --font-family-numeric: "SF Mono","Roboto Mono","PingFang SC",monospace;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-family-base);
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.8;
            font-size: 1rem;
            font-weight: 400;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        a {
            color: var(--text-primary);
            text-decoration: none;
            transition: color 0.25s ease, border-color 0.25s ease, opacity 0.25s ease;
        }

        a:hover,
        a:focus {
            color: var(--accent-gold);
            text-decoration: none;
        }

        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 2px;
        }

        ul,
        ol {
            list-style: none;
            margin: 0;
            padding: 0;
        }

        button {
            font-family: inherit;
            cursor: pointer;
            border: none;
            background: none;
        }

        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding-left: 20px;
            padding-right: 20px;
        }

        .section {
            padding-top: var(--spacing-section);
            padding-bottom: var(--spacing-section);
            position: relative;
        }

        .section-alt {
            background-color: var(--bg-card);
        }

        .section-tight {
            padding-top: 56px;
            padding-bottom: 56px;
        }

        .section-divider {
            border-top: 1px solid var(--border-subtle);
        }

        .eyebrow {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            font-weight: 600;
            letter-spacing: 0.06em;
            text-transform: uppercase;
            color: var(--accent-cyan);
            margin-bottom: 16px;
        }

        .eyebrow::before {
            content: "";
            width: 28px;
            height: 2px;
            background: var(--accent-cyan);
            flex-shrink: 0;
        }

        .section-title {
            font-size: 2rem;
            font-weight: 800;
            line-height: 1.3;
            letter-spacing: -0.01em;
            margin-bottom: 12px;
            color: var(--text-primary);
        }

        .section-subtitle {
            font-size: 1.1rem;
            color: var(--text-secondary);
            max-width: 720px;
            line-height: 1.85;
        }

        .text-center .section-subtitle {
            margin-left: auto;
            margin-right: auto;
        }

        /* Header & Navigation */
        .site-header {
            background: rgba(15,14,14,0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-subtle);
            position: sticky;
            top: 0;
            z-index: 1050;
            padding: 12px 0;
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
        }

        .logo-brand {
            font-size: 1.5rem;
            font-weight: 800;
            letter-spacing: 0.02em;
            color: var(--text-primary);
            white-space: nowrap;
            transition: color 0.25s ease;
            position: relative;
        }

        .logo-brand::after {
            content: "";
            position: absolute;
            bottom: -3px;
            left: 0;
            width: 34px;
            height: 2px;
            background: var(--accent-neon);
            border-radius: 2px;
            transition: width 0.3s ease;
        }

        .logo-brand:hover,
        .logo-brand:focus {
            color: var(--accent-gold);
        }

        .logo-brand:hover::after,
        .logo-brand:focus::after {
            width: 100%;
        }

        .nav-chip-bar {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-wrap: wrap;
            justify-content: center;
        }

        .nav-chip {
            background: transparent;
            color: var(--text-secondary);
            border: 1px solid var(--border-subtle);
            border-radius: 999px;
            padding: 8px 18px;
            font-size: 0.925rem;
            font-weight: 500;
            transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
            white-space: nowrap;
        }

        .nav-chip:hover,
        .nav-chip:focus {
            color: var(--text-primary);
            border-color: var(--accent-neon);
            background-color: rgba(255,77,46,0.08);
            box-shadow: 0 0 14px var(--shadow-glow);
        }

        .nav-chip.active {
            background: var(--accent-neon);
            color: #FFFFFF;
            border-color: var(--accent-neon);
            font-weight: 600;
            box-shadow: 0 0 20px var(--shadow-glow);
        }

        .header-cta {
            background: var(--accent-neon);
            color: #FFFFFF;
            border-radius: 999px;
            padding: 10px 22px;
            font-size: 0.9rem;
            font-weight: 600;
            border: 1px solid var(--accent-neon);
            transition: background-color 0.25s ease, box-shadow 0.25s ease, transform 0.2s ease;
            white-space: nowrap;
        }

        .header-cta:hover,
        .header-cta:focus {
            background: #FF6B4A;
            border-color: #FF6B4A;
            box-shadow: 0 0 24px rgba(255,77,46,0.5);
            color: #FFFFFF;
            transform: translateY(-1px);
        }

        .nav-toggle {
            display: none;
            background: transparent;
            color: var(--text-primary);
            font-size: 1.5rem;
            line-height: 1;
            padding: 4px 10px;
            border-radius: 8px;
            border: 1px solid var(--border-subtle);
        }

        /* Mobile Navigation */
        .mobile-nav {
            display: none;
            background: var(--bg-card);
            border-top: 1px solid var(--border-subtle);
            padding: 12px 20px;
            flex-direction: column;
            gap: 8px;
        }

        .mobile-nav a {
            display: block;
            padding: 10px 14px;
            border-radius: 8px;
            color: var(--text-secondary);
            font-weight: 500;
            transition: background-color 0.2s ease, color 0.2s ease;
        }

        .mobile-nav a:hover,
        .mobile-nav a:focus {
            background: rgba(255,77,46,0.08);
            color: var(--text-primary);
        }

        .mobile-nav a.active {
            color: var(--accent-neon);
            background: rgba(255,77,46,0.12);
        }

        /* Hero */
        .hero-section {
            min-height: 72vh;
            display: flex;
            align-items: center;
            position: relative;
            background-image: linear-gradient(rgba(15,14,14,0.72), rgba(15,14,14,0.88)), url('/assets/images/91c8c1486f8ea0f2.webp');
            background-size: cover;
            background-position: center;
            padding-top: 72px;
            padding-bottom: 72px;
        }

        .hero-content {
            max-width: 820px;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255,77,46,0.14);
            border: 1px solid rgba(255,77,46,0.4);
            border-radius: 999px;
            padding: 6px 14px;
            font-size: 0.8rem;
            font-weight: 600;
            color: var(--accent-gold);
            letter-spacing: 0.04em;
            margin-bottom: 20px;
        }

        .hero-title {
            font-size: 3rem;
            font-weight: 800;
            line-height: 1.25;
            letter-spacing: -0.01em;
            margin-bottom: 18px;
            color: var(--text-primary);
        }

        .hero-title .highlight {
            color: var(--accent-neon);
            position: relative;
        }

        .hero-subtitle {
            font-size: 1.15rem;
            color: var(--text-secondary);
            line-height: 1.9;
            margin-bottom: 28px;
            max-width: 680px;
        }

        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
        }

        .btn-primary-cta {
            background: var(--accent-neon);
            color: #FFFFFF;
            border-radius: 999px;
            padding: 14px 32px;
            font-size: 1rem;
            font-weight: 700;
            border: 2px solid var(--accent-neon);
            transition: background-color 0.25s ease, box-shadow 0.25s ease, transform 0.2s ease;
        }

        .btn-primary-cta:hover,
        .btn-primary-cta:focus {
            background: #FF6B4A;
            border-color: #FF6B4A;
            box-shadow: 0 0 32px rgba(255,77,46,0.55);
            color: #FFFFFF;
            transform: translateY(-2px);
        }

        .btn-secondary-cta {
            background: transparent;
            color: var(--text-primary);
            border-radius: 999px;
            padding: 14px 32px;
            font-size: 1rem;
            font-weight: 600;
            border: 2px solid var(--border-subtle);
            transition: border-color 0.25s ease, background-color 0.25s ease, box-shadow 0.25s ease;
        }

        .btn-secondary-cta:hover,
        .btn-secondary-cta:focus {
            border-color: var(--accent-gold);
            background: rgba(242,183,5,0.08);
            color: var(--accent-gold);
            box-shadow: 0 0 20px rgba(242,183,5,0.2);
        }

        .hero-stats-row {
            display: flex;
            flex-wrap: wrap;
            gap: 28px;
            margin-top: 36px;
        }

        .hero-stat {
            display: flex;
            flex-direction: column;
        }

        .hero-stat-value {
            font-family: var(--font-family-numeric);
            font-size: 1.6rem;
            font-weight: 700;
            color: var(--accent-cyan);
            line-height: 1.2;
        }

        .hero-stat-label {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-top: 4px;
        }

        /* Pain Points */
        .pain-cards {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        .pain-card {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 28px 24px;
            transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
            position: relative;
        }

        .pain-card:hover {
            transform: translateY(-4px);
            border-color: var(--accent-neon);
            box-shadow: 0 0 20px var(--shadow-glow);
        }

        .pain-card-number {
            font-family: var(--font-family-numeric);
            font-size: 2rem;
            font-weight: 700;
            color: var(--accent-neon);
            line-height: 1;
            margin-bottom: 12px;
            display: block;
        }

        .pain-card-title {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 10px;
        }

        .pain-card-text {
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.75;
        }

        .pain-card-solution {
            margin-top: 14px;
            padding-top: 12px;
            border-top: 1px solid var(--border-subtle);
            font-size: 0.875rem;
            color: var(--accent-gold);
            font-weight: 500;
        }

        /* Solution Bridge */
        .solution-bridge {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            padding: 44px 40px;
            position: relative;
            overflow: hidden;
        }

        .solution-bridge::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 4px;
            height: 100%;
            background: linear-gradient(to bottom, var(--accent-neon), var(--accent-gold));
        }

        .solution-bridge-title {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 16px;
        }

        .solution-bridge-text {
            color: var(--text-secondary);
            font-size: 1rem;
            line-height: 1.85;
            margin-bottom: 20px;
            max-width: 680px;
        }

        .solution-pills {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
        }

        .solution-pill {
            background: rgba(46,230,214,0.08);
            border: 1px solid rgba(46,230,214,0.35);
            border-radius: 999px;
            padding: 10px 20px;
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--accent-cyan);
            transition: background-color 0.2s ease, box-shadow 0.2s ease;
        }

        .solution-pill:hover {
            background: rgba(46,230,214,0.15);
            box-shadow: 0 0 16px rgba(46,230,214,0.25);
        }

        /* Steps */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        .step-card {
            background: var(--bg-primary);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 28px 24px;
            transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
        }

        .step-card:hover {
            transform: translateY(-4px);
            border-color: var(--accent-gold);
            box-shadow: 0 0 18px rgba(242,183,5,0.25);
        }

        .step-number {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: rgba(255,77,46,0.12);
            border: 1px solid rgba(255,77,46,0.4);
            color: var(--accent-neon);
            font-family: var(--font-family-numeric);
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 16px;
        }

        .step-card-title {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 8px;
        }

        .step-card-text {
            color: var(--text-secondary);
            font-size: 0.9rem;
            line-height: 1.7;
        }

        /* Progress Modules */
        .progress-modules {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
        }

        .progress-panel {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 28px 26px;
            transition: border-color 0.25s ease, box-shadow 0.25s ease;
        }

        .progress-panel:hover {
            border-color: var(--accent-cyan);
            box-shadow: 0 0 18px rgba(46,230,214,0.2);
        }

        .progress-panel-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 18px;
        }

        .progress-panel-title {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text-primary);
        }

        .progress-panel-percent {
            font-family: var(--font-family-numeric);
            font-size: 1rem;
            font-weight: 700;
            color: var(--accent-cyan);
        }

        .progress-bar-track {
            width: 100%;
            height: 10px;
            background: var(--bg-primary);
            border-radius: 999px;
            overflow: hidden;
            border: 1px solid var(--border-subtle);
        }

        .progress-bar-fill {
            height: 100%;
            border-radius: 999px;
            background: linear-gradient(to right, var(--accent-neon), var(--accent-gold));
            transition: width 0.8s ease;
        }

        .progress-module-list {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: 14px;
        }

        .progress-chip {
            font-size: 0.8rem;
            padding: 6px 12px;
            border-radius: 999px;
            background: var(--bg-elevated);
            border: 1px solid var(--border-subtle);
            color: var(--text-secondary);
        }

        /* Results Wall */
        .results-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        .result-number-card {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 28px 22px;
            text-align: center;
            transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
        }

        .result-number-card:hover {
            transform: translateY(-4px);
            border-color: var(--accent-neon);
            box-shadow: 0 0 18px var(--shadow-glow);
        }

        .result-value {
            font-family: var(--font-family-numeric);
            font-size: 2.4rem;
            font-weight: 800;
            color: var(--accent-gold);
            line-height: 1.2;
            display: block;
            margin-bottom: 8px;
        }

        .result-label {
            font-size: 0.95rem;
            color: var(--text-secondary);
            font-weight: 500;
        }

        /* Testimonials */
        .testimonials-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }

        .testimonial-card {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 28px 24px;
            transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
        }

        .testimonial-card:hover {
            transform: translateY(-4px);
            border-color: var(--accent-cyan);
            box-shadow: 0 0 18px rgba(46,230,214,0.2);
        }

        .testimonial-quote {
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 16px;
        }

        .testimonial-author {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .testimonial-avatar {
            width: 38px;
            height: 38px;
            border-radius: 50%;
            background: rgba(255,77,46,0.2);
            border: 1px solid rgba(255,77,46,0.4);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            color: var(--accent-neon);
            font-size: 0.95rem;
        }

        .testimonial-name {
            font-weight: 600;
            color: var(--text-primary);
            font-size: 0.9rem;
        }

        .testimonial-role {
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        /* Audience */
        .audience-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        .audience-card {
            background: var(--bg-primary);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 26px 22px;
            transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
        }

        .audience-card:hover {
            transform: translateY(-4px);
            border-color: var(--accent-gold);
            box-shadow: 0 0 18px rgba(242,183,5,0.25);
        }

        .audience-icon {
            font-size: 1.8rem;
            color: var(--accent-gold);
            margin-bottom: 12px;
            display: block;
        }

        .audience-title {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 8px;
        }

        .audience-text {
            font-size: 0.875rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* Data Metrics */
        .data-metrics {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            padding: 36px 34px;
        }

        .data-metric-row {
            display: flex;
            align-items: center;
            gap: 16px;
            margin-bottom: 18px;
        }

        .data-metric-row:last-child {
            margin-bottom: 0;
        }

        .data-metric-label {
            min-width: 110px;
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--text-secondary);
        }

        .data-metric-bar {
            flex: 1;
            height: 12px;
            background: var(--bg-primary);
            border-radius: 999px;
            overflow: hidden;
            border: 1px solid var(--border-subtle);
        }

        .data-metric-fill {
            height: 100%;
            border-radius: 999px;
            background: linear-gradient(to right, var(--accent-neon), var(--accent-gold));
            transition: width 0.8s ease;
        }

        .data-metric-value {
            font-family: var(--font-family-numeric);
            font-size: 0.95rem;
            font-weight: 700;
            color: var(--accent-cyan);
            min-width: 52px;
            text-align: right;
        }

        /* News */
        .news-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 22px;
        }

        .news-card {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
        }

        .news-card:hover {
            transform: translateY(-4px);
            border-color: var(--accent-neon);
            box-shadow: 0 0 20px var(--shadow-glow);
        }

        .news-card-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            display: block;
        }

        .news-card-body {
            padding: 20px 22px;
        }

        .news-tag {
            display: inline-block;
            font-size: 0.75rem;
            font-weight: 600;
            color: var(--accent-cyan);
            background: rgba(46,230,214,0.08);
            border: 1px solid rgba(46,230,214,0.35);
            border-radius: 999px;
            padding: 4px 12px;
            margin-bottom: 10px;
        }

        .news-card-title {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 8px;
            line-height: 1.4;
        }

        .news-card-text {
            font-size: 0.875rem;
            color: var(--text-secondary);
            line-height: 1.65;
            margin-bottom: 12px;
        }

        .news-card-date {
            font-size: 0.78rem;
            color: var(--text-muted);
            display: flex;
            align-items: center;
            gap: 6px;
        }

        /* Category Entries */
        .category-entry-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 18px;
        }

        .category-entry-card {
            background: var(--bg-primary);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 24px 20px;
            text-align: center;
            transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
            display: block;
            color: var(--text-primary);
        }

        .category-entry-card:hover,
        .category-entry-card:focus {
            transform: translateY(-4px);
            border-color: var(--accent-neon);
            box-shadow: 0 0 22px var(--shadow-glow);
            color: var(--text-primary);
        }

        .category-entry-icon {
            font-size: 1.6rem;
            color: var(--accent-gold);
            margin-bottom: 10px;
            display: block;
        }

        .category-entry-title {
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 6px;
        }

        .category-entry-text {
            font-size: 0.82rem;
            color: var(--text-muted);
            line-height: 1.5;
        }

        /* Scenes */
        .scene-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 22px;
        }

        .scene-card {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
        }

        .scene-card:hover {
            transform: translateY(-4px);
            border-color: var(--accent-gold);
            box-shadow: 0 0 18px rgba(242,183,5,0.25);
        }

        .scene-card-img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            display: block;
        }

        .scene-card-body {
            padding: 20px 22px;
        }

        .scene-card-title {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 8px;
        }

        .scene-card-text {
            font-size: 0.875rem;
            color: var(--text-secondary);
            line-height: 1.65;
        }

        /* Brand Story */
        .brand-story {
            background: linear-gradient(rgba(15,14,14,0.85), rgba(15,14,14,0.92)), url('/assets/images/fb1c95643b064fe5.webp');
            background-size: cover;
            background-position: center;
            border-radius: var(--radius-lg);
            padding: 56px 48px;
            border: 1px solid var(--border-subtle);
            position: relative;
            overflow: hidden;
        }

        .brand-story::after {
            content: "";
            position: absolute;
            top: 0;
            right: 0;
            width: 200px;
            height: 200px;
            background: radial-gradient(circle, rgba(255,77,46,0.18), transparent 70%);
            pointer-events: none;
        }

        .brand-story-title {
            font-size: 1.6rem;
            font-weight: 800;
            color: var(--text-primary);
            margin-bottom: 20px;
        }

        .brand-story-text {
            color: var(--text-secondary);
            font-size: 1rem;
            line-height: 2;
            max-width: 800px;
        }

        /* FAQ */
        .accordion.custom-accordion .accordion-item {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            margin-bottom: 12px;
            overflow: hidden;
        }

        .accordion.custom-accordion .accordion-button {
            background: transparent;
            color: var(--text-primary);
            font-weight: 600;
            padding: 20px 24px;
            border: none;
            box-shadow: none;
            font-size: 1rem;
        }

        .accordion.custom-accordion .accordion-button:not(.collapsed) {
            background: rgba(255,77,46,0.06);
            color: var(--accent-gold);
            box-shadow: none;
        }

        .accordion.custom-accordion .accordion-button:focus {
            box-shadow: none;
            outline: none;
            border-color: var(--accent-cyan);
        }

        .accordion.custom-accordion .accordion-button::after {
            background-image: none;
            content: "+";
            font-size: 1.5rem;
            color: var(--accent-neon);
            display: flex;
            align-items: center;
            justify-content: center;
            width: 28px;
            height: 28px;
            line-height: 1;
        }

        .accordion.custom-accordion .accordion-button:not(.collapsed)::after {
            content: "−";
            color: var(--accent-gold);
        }

        .accordion.custom-accordion .accordion-body {
            background: var(--bg-primary);
            color: var(--text-secondary);
            padding: 18px 24px 22px;
            font-size: 0.95rem;
            line-height: 1.8;
            border-top: 1px solid var(--border-subtle);
        }

        /* CTA Section */
        .cta-band {
            background: linear-gradient(135deg, rgba(255,77,46,0.15), rgba(242,183,5,0.08));
            border: 1px solid rgba(255,77,46,0.4);
            border-radius: var(--radius-lg);
            padding: 52px 42px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .cta-band::before {
            content: "";
            position: absolute;
            top: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 180px;
            height: 3px;
            background: linear-gradient(to right, transparent, var(--accent-neon), transparent);
        }

        .cta-band-title {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--text-primary);
            margin-bottom: 14px;
        }

        .cta-band-text {
            color: var(--text-secondary);
            font-size: 1.05rem;
            line-height: 1.8;
            margin-bottom: 28px;
            max-width: 560px;
            margin-left: auto;
            margin-right: auto;
        }

        .cta-form {
            display: flex;
            gap: 12px;
            max-width: 480px;
            margin: 0 auto;
            flex-wrap: wrap;
            justify-content: center;
        }

        .cta-input {
            flex: 1;
            min-width: 220px;
            padding: 14px 18px;
            background: var(--bg-primary);
            border: 1px solid var(--border-subtle);
            border-radius: 999px;
            color: var(--text-primary);
            font-size: 0.95rem;
            transition: border-color 0.25s ease, box-shadow 0.25s ease;
        }

        .cta-input:focus {
            outline: none;
            border-color: var(--accent-cyan);
            box-shadow: 0 0 16px rgba(46,230,214,0.25);
        }

        .cta-input::placeholder {
            color: var(--text-muted);
        }

        .cta-button {
            background: var(--accent-neon);
            color: #FFFFFF;
            border-radius: 999px;
            padding: 14px 30px;
            font-size: 0.95rem;
            font-weight: 700;
            border: 2px solid var(--accent-neon);
            transition: background-color 0.25s ease, box-shadow 0.25s ease, transform 0.2s ease;
            white-space: nowrap;
        }

        .cta-button:hover,
        .cta-button:focus {
            background: #FF6B4A;
            border-color: #FF6B4A;
            box-shadow: 0 0 28px rgba(255,77,46,0.5);
            transform: translateY(-2px);
            color: #FFFFFF;
        }

        /* Footer */
        .site-footer {
            background: var(--bg-primary);
            border-top: 1px solid var(--border-subtle);
            padding: 56px 0 24px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 36px;
        }

        .footer-brand-name {
            font-size: 1.3rem;
            font-weight: 800;
            color: var(--text-primary);
            margin-bottom: 12px;
        }

        .footer-brand-text {
            font-size: 0.875rem;
            color: var(--text-muted);
            line-height: 1.7;
        }

        .footer-col-title {
            font-size: 0.9rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 14px;
            letter-spacing: 0.04em;
        }

        .footer-col-link {
            display: block;
            font-size: 0.875rem;
            color: var(--text-secondary);
            padding: 5px 0;
            transition: color 0.2s ease, padding-left 0.2s ease;
        }

        .footer-col-link:hover,
        .footer-col-link:focus {
            color: var(--accent-gold);
            padding-left: 6px;
        }

        .footer-bottom {
            border-top: 1px solid var(--border-subtle);
            padding-top: 20px;
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            align-items: center;
            justify-content: space-between;
        }

        .footer-copyright {
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        .footer-copyright a {
            color: var(--text-muted);
            text-decoration: underline;
        }

        .footer-copyright a:hover,
        .footer-copyright a:focus {
            color: var(--accent-gold);
        }

        /* Responsive */
        @media (max-width: 1200px) {
            .pain-cards,
            .steps-grid,
            .audience-grid,
            .category-entry-grid {
                grid-template-columns: repeat(3, 1fr);
            }
            .results-grid {
                grid-template-columns: repeat(4, 1fr);
            }
        }

        @media (max-width: 992px) {
            .section {
                padding-top: 64px;
                padding-bottom: 64px;
            }

            .hero-title {
                font-size: 2.4rem;
            }

            .pain-cards,
            .steps-grid,
            .audience-grid,
            .category-entry-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .testimonials-grid,
            .news-grid,
            .scene-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .results-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .progress-modules {
                grid-template-columns: 1fr;
            }

            .footer-grid {
                grid-template-columns: 1fr 1fr 1fr;
            }

            .header-cta {
                display: none;
            }
        }

        @media (max-width: 768px) {
            .header-inner {
                flex-wrap: wrap;
                gap: 8px;
            }

            .nav-chip-bar {
                order: 3;
                width: 100%;
                overflow-x: auto;
                flex-wrap: nowrap;
                padding-bottom: 4px;
                -webkit-overflow-scrolling: touch;
                scrollbar-width: thin;
                scrollbar-color: var(--border-subtle) transparent;
            }

            .nav-chip-bar::-webkit-scrollbar {
                height: 4px;
            }

            .nav-chip-bar::-webkit-scrollbar-thumb {
                background: var(--border-subtle);
                border-radius: 999px;
            }

            .nav-chip {
                padding: 7px 14px;
                font-size: 0.85rem;
                flex-shrink: 0;
            }

            .hero-section {
                min-height: auto;
                padding-top: 48px;
                padding-bottom: 48px;
            }

            .hero-title {
                font-size: 1.75rem;
            }

            .hero-subtitle {
                font-size: 1rem;
            }

            .hero-stats-row {
                gap: 18px;
                margin-top: 24px;
            }

            .hero-stat-value {
                font-size: 1.3rem;
            }

            .section-title {
                font-size: 1.6rem;
            }

            .pain-cards,
            .steps-grid,
            .audience-grid,
            .category-entry-grid,
            .testimonials-grid,
            .news-grid,
            .scene-grid,
            .results-grid {
                grid-template-columns: 1fr;
            }

            .solution-bridge {
                padding: 32px 24px;
            }

            .brand-story {
                padding: 36px 24px;
            }

            .data-metrics {
                padding: 26px 20px;
            }

            .data-metric-row {
                flex-direction: column;
                align-items: flex-start;
                gap: 8px;
            }

            .data-metric-label {
                min-width: auto;
            }

            .data-metric-value {
                text-align: left;
            }

            .cta-band {
                padding: 36px 22px;
            }

            .cta-band-title {
                font-size: 1.4rem;
            }

            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }

            .footer-bottom {
                flex-direction: column;
                text-align: center;
                gap: 8px;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }

            .section {
                padding-top: 48px;
                padding-bottom: 48px;
            }

            .hero-title {
                font-size: 1.6rem;
            }

            .hero-actions {
                flex-direction: column;
                width: 100%;
            }

            .btn-primary-cta,
            .btn-secondary-cta {
                width: 100%;
                text-align: center;
                padding: 12px 24px;
                font-size: 0.95rem;
            }

            .hero-badge {
                font-size: 0.75rem;
                padding: 5px 12px;
            }

            .section-title {
                font-size: 1.4rem;
            }

            .section-subtitle {
                font-size: 0.95rem;
            }

            .pain-card-title,
            .step-card-title,
            .audience-title,
            .category-entry-title {
                font-size: 1.05rem;
            }

            .testimonial-card,
            .news-card,
            .scene-card,
            .pain-card,
            .step-card,
            .audience-card {
                padding: 20px 16px;
            }

            .news-card-img,
            .scene-card-img {
                height: 160px;
            }

            .result-value {
                font-size: 1.8rem;
            }

            .brand-story {
                padding: 28px 18px;
            }

            .brand-story-title {
                font-size: 1.3rem;
            }

            .brand-story-text {
                font-size: 0.9rem;
                line-height: 1.85;
            }

            .accordion.custom-accordion .accordion-button {
                padding: 16px 18px;
                font-size: 0.9rem;
            }

            .cta-form {
                flex-direction: column;
                width: 100%;
            }

            .cta-input {
                width: 100%;
                min-width: auto;
                padding: 12px 16px;
                font-size: 0.9rem;
            }

            .cta-button {
                width: 100%;
                padding: 12px 24px;
                font-size: 0.9rem;
                text-align: center;
            }
        }

/* roulang page: category1 */
:root {
            --bg-primary: #0F0E0E;
            --bg-card: #1B1A1F;
            --bg-elevated: #232229;
            --text-primary: #F2F0E8;
            --text-secondary: #A8A6AD;
            --text-muted: #6E6C74;
            --accent-neon: #FF4D2E;
            --accent-gold: #F2B705;
            --accent-cyan: #2EE6D6;
            --border-subtle: #3A3942;
            --border-hover: #FF4D2E;
            --shadow-dark: rgba(0, 0, 0, 0.45);
            --shadow-glow: rgba(255, 77, 46, 0.35);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --spacing-section: 72px;
            --container-max: 1200px;
            --font-family-base: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            --font-family-numeric: "SF Mono", "Roboto Mono", "PingFang SC", monospace;
        }

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-family-base);
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.8;
            font-size: 1rem;
            font-weight: 400;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
            min-height: 100vh;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        a {
            color: var(--text-primary);
            text-decoration: none;
            transition: color 0.25s ease, border-color 0.25s ease, opacity 0.25s ease, box-shadow 0.25s ease;
        }

        a:hover,
        a:focus {
            color: var(--accent-gold);
            text-decoration: none;
        }

        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 2px;
        }

        button {
            font-family: inherit;
            cursor: pointer;
            border: none;
            background: none;
        }

        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding-left: 20px;
            padding-right: 20px;
        }

        .section {
            padding-top: var(--spacing-section);
            padding-bottom: var(--spacing-section);
            position: relative;
        }

        .section-alt {
            background-color: var(--bg-card);
        }

        .section-tight {
            padding-top: 48px;
            padding-bottom: 48px;
        }

        .section-divider {
            border-top: 1px solid var(--border-subtle);
        }

        .eyebrow {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            font-weight: 600;
            letter-spacing: 0.06em;
            text-transform: uppercase;
            color: var(--accent-cyan);
            margin-bottom: 16px;
        }

        .eyebrow::before {
            content: "";
            width: 28px;
            height: 2px;
            background: var(--accent-cyan);
            flex-shrink: 0;
        }

        .section-title {
            font-size: 2rem;
            font-weight: 800;
            line-height: 1.3;
            letter-spacing: -0.01em;
            margin-bottom: 12px;
            color: var(--text-primary);
        }

        .section-subtitle {
            font-size: 1.1rem;
            color: var(--text-secondary);
            max-width: 720px;
            line-height: 1.85;
        }

        .text-center .section-subtitle {
            margin-left: auto;
            margin-right: auto;
        }

        /* Header & Navigation */
        .site-header {
            background: rgba(15, 14, 14, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-subtle);
            position: sticky;
            top: 0;
            z-index: 1050;
            padding: 12px 0;
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
            flex-wrap: wrap;
        }

        .logo-brand {
            font-size: 1.5rem;
            font-weight: 800;
            letter-spacing: 0.02em;
            color: var(--text-primary);
            white-space: nowrap;
            transition: color 0.25s ease;
            position: relative;
        }

        .logo-brand::after {
            content: "";
            position: absolute;
            bottom: -3px;
            left: 0;
            width: 34px;
            height: 2px;
            background: var(--accent-neon);
            border-radius: 2px;
            transition: width 0.3s ease;
        }

        .logo-brand:hover,
        .logo-brand:focus {
            color: var(--accent-gold);
        }

        .logo-brand:hover::after,
        .logo-brand:focus::after {
            width: 100%;
        }

        .nav-chip-bar {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-wrap: wrap;
            justify-content: center;
        }

        .nav-chip {
            background: transparent;
            color: var(--text-secondary);
            border: 1px solid var(--border-subtle);
            border-radius: 999px;
            padding: 8px 18px;
            font-size: 0.925rem;
            font-weight: 500;
            transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
            white-space: nowrap;
        }

        .nav-chip:hover,
        .nav-chip:focus {
            color: var(--text-primary);
            border-color: var(--accent-neon);
            background-color: rgba(255, 77, 46, 0.08);
            box-shadow: 0 0 14px var(--shadow-glow);
        }

        .nav-chip.active {
            background: var(--accent-neon);
            color: #FFFFFF;
            border-color: var(--accent-neon);
            font-weight: 600;
            box-shadow: 0 0 20px var(--shadow-glow);
        }

        .header-cta {
            background: var(--accent-neon);
            color: #FFFFFF;
            border-radius: 999px;
            padding: 10px 22px;
            font-size: 0.9rem;
            font-weight: 600;
            white-space: nowrap;
            transition: background-color 0.25s ease, box-shadow 0.25s ease, transform 0.2s ease;
            box-shadow: 0 0 14px rgba(255, 77, 46, 0.25);
        }

        .header-cta:hover,
        .header-cta:focus {
            background-color: #ff6647;
            color: #FFFFFF;
            box-shadow: 0 0 24px rgba(255, 77, 46, 0.45);
            transform: translateY(-1px);
        }

        /* Category Hero Banner */
        .category-hero {
            background-image: linear-gradient(rgba(15, 14, 14, 0.78), rgba(15, 14, 14, 0.88)), url('/assets/images/91c8c1486f8ea0f2.webp');
            background-size: cover;
            background-position: center;
            padding-top: 56px;
            padding-bottom: 56px;
            border-bottom: 1px solid var(--border-subtle);
            position: relative;
        }

        .category-hero::after {
            content: "";
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 1px;
            background: linear-gradient(90deg, transparent, var(--accent-neon), transparent);
            opacity: 0.35;
        }

        .breadcrumb-wrap {
            margin-bottom: 20px;
            font-size: 0.875rem;
            color: var(--text-muted);
            display: flex;
            align-items: center;
            gap: 8px;
            flex-wrap: wrap;
        }

        .breadcrumb-wrap a {
            color: var(--text-muted);
            transition: color 0.2s ease;
        }

        .breadcrumb-wrap a:hover,
        .breadcrumb-wrap a:focus {
            color: var(--accent-gold);
        }

        .breadcrumb-separator {
            color: var(--text-muted);
            opacity: 0.6;
        }

        .category-hero-inner {
            display: flex;
            align-items: flex-start;
            justify-content: space-between;
            gap: 32px;
            flex-wrap: wrap;
            position: relative;
            z-index: 1;
        }

        .category-hero-main {
            flex: 1 1 600px;
        }

        .category-hero-title {
            font-size: 2.5rem;
            font-weight: 800;
            line-height: 1.25;
            color: var(--text-primary);
            margin-bottom: 16px;
            letter-spacing: -0.01em;
        }

        .category-hero-title em {
            font-style: normal;
            color: var(--accent-neon);
        }

        .category-hero-desc {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 700px;
            line-height: 1.9;
            margin-bottom: 20px;
        }

        .category-hero-stats {
            display: flex;
            flex-wrap: wrap;
            gap: 28px;
        }

        .hero-stat-item {
            display: flex;
            flex-direction: column;
        }

        .hero-stat-value {
            font-family: var(--font-family-numeric);
            font-size: 1.75rem;
            font-weight: 700;
            color: var(--accent-gold);
            line-height: 1.2;
        }

        .hero-stat-label {
            font-size: 0.8rem;
            color: var(--text-muted);
            letter-spacing: 0.03em;
        }

        /* Article List Section */
        .article-list-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 16px;
            margin-bottom: 32px;
        }

        .article-list-header .section-title {
            margin-bottom: 0;
        }

        .article-count-tag {
            font-size: 0.85rem;
            color: var(--text-muted);
            background: var(--bg-elevated);
            border: 1px solid var(--border-subtle);
            border-radius: 999px;
            padding: 6px 14px;
            white-space: nowrap;
        }

        .article-list {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .article-card-horizontal {
            display: flex;
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
            flex-direction: column;
        }

        .article-card-horizontal:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 30px var(--shadow-dark);
            border-color: var(--border-hover);
        }

        .article-card-horizontal .article-thumb {
            flex-shrink: 0;
            width: 100%;
            aspect-ratio: 16/9;
            overflow: hidden;
            background: var(--bg-elevated);
        }

        .article-card-horizontal .article-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }

        .article-card-horizontal:hover .article-thumb img {
            transform: scale(1.04);
        }

        .article-card-body {
            padding: 22px 24px;
            display: flex;
            flex-direction: column;
            gap: 10px;
            flex: 1;
        }

        .article-meta-row {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-wrap: wrap;
        }

        .article-date {
            font-size: 0.8rem;
            color: var(--text-muted);
            font-family: var(--font-family-numeric);
        }

        .article-heat-badge {
            font-size: 0.75rem;
            color: var(--accent-cyan);
            background: rgba(46, 230, 214, 0.08);
            border: 1px solid rgba(46, 230, 214, 0.25);
            border-radius: 999px;
            padding: 3px 10px;
            font-weight: 500;
        }

        .article-tag-chip {
            font-size: 0.72rem;
            color: var(--text-secondary);
            background: var(--bg-elevated);
            border-radius: 999px;
            padding: 3px 10px;
            border: 1px solid var(--border-subtle);
        }

        .article-card-title {
            font-size: 1.25rem;
            font-weight: 700;
            line-height: 1.45;
            color: var(--text-primary);
            margin-bottom: 0;
        }

        .article-card-title a {
            color: var(--text-primary);
            transition: color 0.25s ease;
        }

        .article-card-title a:hover,
        .article-card-title a:focus {
            color: var(--accent-gold);
        }

        .article-card-excerpt {
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.75;
            margin-bottom: 0;
        }

        .article-card-link {
            font-size: 0.9rem;
            color: var(--accent-neon);
            font-weight: 500;
            transition: color 0.25s ease;
        }

        .article-card-link:hover,
        .article-card-link:focus {
            color: var(--accent-gold);
        }

        .view-more-wrap {
            margin-top: 28px;
            text-align: center;
        }

        .btn-view-more {
            background: transparent;
            color: var(--text-secondary);
            border: 1px solid var(--border-subtle);
            border-radius: 999px;
            padding: 12px 28px;
            font-size: 0.9rem;
            font-weight: 500;
            transition: color 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease, background-color 0.25s ease;
        }

        .btn-view-more:hover,
        .btn-view-more:focus {
            color: var(--text-primary);
            border-color: var(--accent-neon);
            background-color: rgba(255, 77, 46, 0.08);
            box-shadow: 0 0 16px var(--shadow-glow);
        }

        /* Data Brief Section */
        .data-brief-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 16px;
        }

        .data-brief-card {
            background: var(--bg-elevated);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 18px 20px;
            transition: border-color 0.25s ease, box-shadow 0.25s ease;
        }

        .data-brief-card:hover {
            border-color: var(--border-hover);
            box-shadow: 0 0 16px rgba(255, 77, 46, 0.12);
        }

        .data-matchup {
            font-size: 0.95rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 10px;
        }

        .data-row {
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 0.85rem;
            color: var(--text-secondary);
            padding: 4px 0;
            border-bottom: 1px solid rgba(58, 57, 66, 0.5);
        }

        .data-row:last-child {
            border-bottom: none;
        }

        .data-value {
            font-family: var(--font-family-numeric);
            color: var(--accent-gold);
            font-weight: 600;
        }

        .data-value.cyan {
            color: var(--accent-cyan);
        }

        /* Tag Cloud */
        .tag-cloud-wrap {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }

        .tag-cloud-chip {
            font-size: 0.85rem;
            color: var(--text-secondary);
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: 999px;
            padding: 8px 18px;
            transition: color 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease, background-color 0.25s ease;
        }

        .tag-cloud-chip:hover,
        .tag-cloud-chip:focus {
            color: var(--text-primary);
            border-color: var(--accent-cyan);
            background-color: rgba(46, 230, 214, 0.06);
            box-shadow: 0 0 12px rgba(46, 230, 214, 0.15);
        }

        /* Related Topics */
        .related-topic-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }

        .topic-card {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
            display: flex;
            flex-direction: column;
        }

        .topic-card:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 26px var(--shadow-dark);
            border-color: var(--border-hover);
        }

        .topic-thumb {
            aspect-ratio: 16/9;
            overflow: hidden;
            background: var(--bg-elevated);
        }

        .topic-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }

        .topic-card:hover .topic-thumb img {
            transform: scale(1.04);
        }

        .topic-body {
            padding: 18px 20px;
            display: flex;
            flex-direction: column;
            gap: 8px;
            flex: 1;
        }

        .topic-title {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text-primary);
        }

        .topic-desc {
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 0;
        }

        /* Category Description */
        .category-desc-wrap {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            padding: 40px 40px;
            max-width: 880px;
            margin: 0 auto;
        }

        .category-desc-wrap p {
            font-size: 1rem;
            color: var(--text-secondary);
            line-height: 2;
            margin-bottom: 16px;
        }

        .category-desc-wrap p:last-child {
            margin-bottom: 0;
        }

        .category-desc-wrap strong {
            color: var(--text-primary);
            font-weight: 600;
        }

        /* CTA Zone */
        .cta-panel {
            background: var(--bg-elevated);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            padding: 48px 40px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 32px;
            flex-wrap: wrap;
        }

        .cta-panel-text {
            flex: 1 1 400px;
        }

        .cta-panel-title {
            font-size: 1.6rem;
            font-weight: 800;
            color: var(--text-primary);
            margin-bottom: 10px;
        }

        .cta-panel-desc {
            font-size: 1rem;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 0;
        }

        .cta-form {
            flex: 1 1 320px;
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
        }

        .cta-form input {
            flex: 1 1 200px;
            background: var(--bg-primary);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-sm);
            padding: 12px 16px;
            color: var(--text-primary);
            font-size: 0.95rem;
            font-family: var(--font-family-base);
            transition: border-color 0.25s ease, box-shadow 0.25s ease;
        }

        .cta-form input::placeholder {
            color: var(--text-muted);
        }

        .cta-form input:focus {
            border-color: var(--accent-cyan);
            box-shadow: 0 0 12px rgba(46, 230, 214, 0.2);
            outline: none;
        }

        .btn-cta-submit {
            background: var(--accent-neon);
            color: #FFFFFF;
            border-radius: var(--radius-sm);
            padding: 12px 24px;
            font-size: 0.95rem;
            font-weight: 600;
            white-space: nowrap;
            transition: background-color 0.25s ease, box-shadow 0.25s ease, transform 0.2s ease;
            box-shadow: 0 0 14px rgba(255, 77, 46, 0.25);
        }

        .btn-cta-submit:hover,
        .btn-cta-submit:focus {
            background-color: #ff6647;
            color: #FFFFFF;
            box-shadow: 0 0 24px rgba(255, 77, 46, 0.45);
            transform: translateY(-1px);
        }

        /* Footer */
        .site-footer {
            background: #090808;
            border-top: 1px solid var(--border-subtle);
            padding-top: 48px;
            padding-bottom: 24px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2.2fr 1fr 1fr 1fr 1.4fr;
            gap: 32px;
            margin-bottom: 36px;
        }

        .footer-brand-name {
            font-size: 1.3rem;
            font-weight: 800;
            color: var(--text-primary);
            margin-bottom: 10px;
        }

        .footer-brand-text {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 0;
            max-width: 320px;
        }

        .footer-col-title {
            font-size: 0.85rem;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: 0.04em;
            margin-bottom: 14px;
            text-transform: uppercase;
        }

        .footer-col-link {
            display: block;
            font-size: 0.9rem;
            color: var(--text-secondary);
            padding: 4px 0;
            transition: color 0.2s ease;
        }

        .footer-col-link:hover,
        .footer-col-link:focus {
            color: var(--accent-gold);
        }

        .footer-bottom {
            border-top: 1px solid var(--border-subtle);
            padding-top: 20px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
        }

        .footer-copyright {
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: repeat(3, 1fr);
                gap: 24px;
            }
            .related-topic-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .data-brief-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .category-hero-title {
                font-size: 2.2rem;
            }
        }

        @media (max-width: 768px) {
            .header-inner {
                flex-direction: column;
                gap: 12px;
            }
            .nav-chip-bar {
                order: 3;
                width: 100%;
                overflow-x: auto;
                flex-wrap: nowrap;
                justify-content: flex-start;
                padding-bottom: 4px;
                scrollbar-width: thin;
                scrollbar-color: var(--border-subtle) transparent;
            }
            .nav-chip {
                flex-shrink: 0;
            }
            .header-cta {
                order: 2;
            }
            .logo-brand {
                order: 1;
            }
            .category-hero-title {
                font-size: 1.8rem;
            }
            .category-hero-stats {
                gap: 16px;
            }
            .hero-stat-value {
                font-size: 1.4rem;
            }
            .section {
                padding-top: 56px;
                padding-bottom: 56px;
            }
            .section-title {
                font-size: 1.6rem;
            }
            .related-topic-grid {
                grid-template-columns: 1fr;
            }
            .data-brief-grid {
                grid-template-columns: 1fr;
            }
            .cta-panel {
                flex-direction: column;
                align-items: flex-start;
                padding: 32px 24px;
            }
            .cta-form {
                width: 100%;
                flex-direction: column;
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
            .article-card-horizontal {
                flex-direction: column;
            }
            .article-card-horizontal .article-thumb {
                width: 100%;
            }
            .category-desc-wrap {
                padding: 28px 22px;
            }
        }

        @media (max-width: 520px) {
            .category-hero-title {
                font-size: 1.6rem;
            }
            .category-hero-desc {
                font-size: 0.95rem;
            }
            .article-card-body {
                padding: 18px 18px;
            }
            .article-card-title {
                font-size: 1.1rem;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .cta-panel {
                padding: 24px 18px;
            }
            .category-desc-wrap {
                padding: 22px 16px;
            }
            .section-title {
                font-size: 1.4rem;
            }
        }

/* roulang page: category2 */
:root {
            --bg-primary: #0F0E0E;
            --bg-card: #1B1A1F;
            --bg-elevated: #232229;
            --text-primary: #F2F0E8;
            --text-secondary: #A8A6AD;
            --text-muted: #6E6C74;
            --accent-neon: #FF4D2E;
            --accent-gold: #F2B705;
            --accent-cyan: #2EE6D6;
            --border-subtle: #3A3942;
            --border-hover: #FF4D2E;
            --shadow-dark: rgba(0,0,0,0.45);
            --shadow-glow: rgba(255,77,46,0.35);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --spacing-section: 88px;
            --container-max: 1200px;
            --font-family-base: "PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
            --font-family-numeric: "SF Mono","Roboto Mono","PingFang SC",monospace;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font-family-base);
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.8;
            font-size: 1rem;
            font-weight: 400;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: var(--text-primary);
            text-decoration: none;
            transition: color 0.25s ease, border-color 0.25s ease, opacity 0.25s ease;
        }
        a:hover, a:focus {
            color: var(--accent-gold);
            text-decoration: none;
        }
        a:focus-visible, button:focus-visible, input:focus-visible {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 2px;
        }
        button {
            font-family: inherit;
            cursor: pointer;
            border: none;
            background: none;
        }
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding-left: 20px;
            padding-right: 20px;
        }
        .section {
            padding-top: var(--spacing-section);
            padding-bottom: var(--spacing-section);
            position: relative;
        }
        .section-alt {
            background-color: var(--bg-card);
        }
        .section-tight {
            padding-top: 56px;
            padding-bottom: 56px;
        }
        .section-divider {
            border-top: 1px solid var(--border-subtle);
        }
        .eyebrow {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            font-weight: 600;
            letter-spacing: 0.06em;
            text-transform: uppercase;
            color: var(--accent-cyan);
            margin-bottom: 16px;
        }
        .eyebrow::before {
            content: "";
            width: 28px;
            height: 2px;
            background: var(--accent-cyan);
            flex-shrink: 0;
        }
        .section-title {
            font-size: 2rem;
            font-weight: 800;
            line-height: 1.3;
            letter-spacing: -0.01em;
            margin-bottom: 12px;
            color: var(--text-primary);
        }
        .section-subtitle {
            font-size: 1.1rem;
            color: var(--text-secondary);
            max-width: 720px;
            line-height: 1.85;
        }
        .text-center .section-subtitle {
            margin-left: auto;
            margin-right: auto;
        }

        /* Header & Navigation */
        .site-header {
            background: rgba(15,14,14,0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-subtle);
            position: sticky;
            top: 0;
            z-index: 1050;
            padding: 12px 0;
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
        }
        .logo-brand {
            font-size: 1.5rem;
            font-weight: 800;
            letter-spacing: 0.02em;
            color: var(--text-primary);
            white-space: nowrap;
            transition: color 0.25s ease;
            position: relative;
        }
        .logo-brand::after {
            content: "";
            position: absolute;
            bottom: -3px;
            left: 0;
            width: 34px;
            height: 2px;
            background: var(--accent-neon);
            border-radius: 2px;
            transition: width 0.3s ease;
        }
        .logo-brand:hover, .logo-brand:focus {
            color: var(--accent-gold);
        }
        .logo-brand:hover::after, .logo-brand:focus::after {
            width: 100%;
        }
        .nav-chip-bar {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-wrap: wrap;
            justify-content: center;
        }
        .nav-chip {
            background: transparent;
            color: var(--text-secondary);
            border: 1px solid var(--border-subtle);
            border-radius: 999px;
            padding: 8px 18px;
            font-size: 0.925rem;
            font-weight: 500;
            transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
            white-space: nowrap;
        }
        .nav-chip:hover, .nav-chip:focus {
            color: var(--text-primary);
            border-color: var(--accent-neon);
            background-color: rgba(255,77,46,0.08);
            box-shadow: 0 0 14px var(--shadow-glow);
        }
        .nav-chip.active {
            background: var(--accent-neon);
            color: #FFFFFF;
            border-color: var(--accent-neon);
            font-weight: 600;
            box-shadow: 0 0 20px var(--shadow-glow);
        }
        .header-cta {
            background: var(--accent-neon);
            color: #FFFFFF;
            border-radius: 999px;
            padding: 10px 22px;
            font-size: 0.9rem;
            font-weight: 600;
            transition: background-color 0.25s ease, box-shadow 0.25s ease, transform 0.2s ease;
            white-space: nowrap;
            display: inline-block;
        }
        .header-cta:hover, .header-cta:focus {
            background-color: #e6401d;
            color: #FFFFFF;
            box-shadow: 0 0 20px var(--shadow-glow);
            transform: translateY(-1px);
        }

        /* Breadcrumb */
        .breadcrumb-custom {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.9rem;
            color: var(--text-muted);
            margin-bottom: 24px;
            flex-wrap: wrap;
        }
        .breadcrumb-custom a {
            color: var(--text-secondary);
            transition: color 0.2s ease;
        }
        .breadcrumb-custom a:hover, .breadcrumb-custom a:focus {
            color: var(--accent-gold);
        }
        .breadcrumb-sep {
            color: var(--border-subtle);
            font-weight: 300;
            user-select: none;
        }
        .breadcrumb-custom span:last-child {
            color: var(--text-primary);
            font-weight: 500;
        }

        /* Category Banner */
        .category-banner {
            position: relative;
            padding: 72px 0 88px;
            overflow: hidden;
            background-color: var(--bg-card);
            border-bottom: 1px solid var(--border-subtle);
        }
        .banner-bg {
            position: absolute;
            inset: 0;
            background-size: cover;
            background-position: center;
            opacity: 0.18;
            pointer-events: none;
        }
        .banner-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15,14,14,0.88) 0%, rgba(15,14,14,0.55) 60%, rgba(255,77,46,0.15) 100%);
            pointer-events: none;
        }
        .banner-content {
            position: relative;
            z-index: 2;
            max-width: 780px;
        }
        .banner-content h1 {
            font-size: 2.75rem;
            font-weight: 800;
            letter-spacing: -0.015em;
            line-height: 1.2;
            margin-bottom: 16px;
            color: var(--text-primary);
        }
        .banner-subtitle {
            font-size: 1.15rem;
            color: var(--text-secondary);
            line-height: 1.9;
            max-width: 680px;
        }

        /* Article Card List */
        .article-list-section {
            background-color: var(--bg-primary);
        }
        .guide-card {
            display: flex;
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            overflow: hidden;
            margin-bottom: 20px;
            transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
            position: relative;
        }
        .guide-card:hover, .guide-card:focus-within {
            transform: translateY(-4px);
            border-color: var(--border-hover);
            box-shadow: 0 0 22px var(--shadow-glow);
        }
        .guide-card-img {
            flex-shrink: 0;
            width: 280px;
            min-height: 200px;
            position: relative;
            background-color: var(--bg-elevated);
            overflow: hidden;
        }
        .guide-card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }
        .guide-card:hover .guide-card-img img {
            transform: scale(1.04);
        }
        .guide-card-body {
            flex: 1;
            padding: 24px 28px;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .guide-card-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-wrap: wrap;
        }
        .badge-date {
            font-size: 0.8rem;
            color: var(--text-muted);
            background: var(--bg-elevated);
            border: 1px solid var(--border-subtle);
            border-radius: 999px;
            padding: 4px 12px;
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .badge-heat {
            font-size: 0.8rem;
            color: var(--accent-gold);
            background: rgba(242,183,5,0.1);
            border: 1px solid rgba(242,183,5,0.3);
            border-radius: 999px;
            padding: 4px 12px;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-family: var(--font-family-numeric);
        }
        .guide-card-title {
            font-size: 1.35rem;
            font-weight: 700;
            line-height: 1.45;
            margin-bottom: 4px;
        }
        .guide-card-title a {
            color: var(--text-primary);
            transition: color 0.25s ease;
        }
        .guide-card-title a:hover, .guide-card-title a:focus {
            color: var(--accent-gold);
        }
        .guide-card-excerpt {
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.8;
            margin-bottom: 8px;
        }
        .guide-card-footer {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-wrap: wrap;
            margin-top: auto;
        }
        .read-link {
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--accent-neon);
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: color 0.25s ease, gap 0.25s ease;
        }
        .read-link:hover, .read-link:focus {
            color: var(--accent-gold);
            gap: 10px;
        }
        .tag-item {
            font-size: 0.78rem;
            color: var(--text-secondary);
            background: transparent;
            border: 1px solid var(--border-subtle);
            border-radius: 999px;
            padding: 3px 12px;
            display: inline-flex;
            align-items: center;
        }
        .view-more-wrap {
            text-align: center;
            margin-top: 36px;
        }
        .btn-view-more {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: transparent;
            color: var(--text-primary);
            border: 1px solid var(--border-subtle);
            border-radius: 999px;
            padding: 12px 32px;
            font-size: 0.95rem;
            font-weight: 600;
            transition: border-color 0.25s ease, background-color 0.25s ease, box-shadow 0.25s ease, color 0.25s ease;
        }
        .btn-view-more:hover, .btn-view-more:focus {
            border-color: var(--accent-neon);
            background-color: rgba(255,77,46,0.08);
            color: var(--accent-gold);
            box-shadow: 0 0 18px var(--shadow-glow);
        }

        /* Version Tactical Overview */
        .tactical-speed-card {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 24px;
            height: 100%;
            transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
        }
        .tactical-speed-card:hover {
            transform: translateY(-4px);
            border-color: var(--accent-cyan);
            box-shadow: 0 0 20px rgba(46,230,214,0.25);
        }
        .tactical-speed-icon {
            width: 48px;
            height: 48px;
            border-radius: var(--radius-sm);
            background: rgba(46,230,214,0.1);
            color: var(--accent-cyan);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.25rem;
            margin-bottom: 16px;
        }
        .tactical-speed-card h3 {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text-primary);
        }
        .tactical-speed-card p {
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.75;
            margin-bottom: 0;
        }

        /* Data Brief Cards */
        .stat-data-card {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 28px 24px;
            text-align: center;
            height: 100%;
            transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
        }
        .stat-data-card:hover {
            transform: translateY(-4px);
            border-color: var(--accent-gold);
            box-shadow: 0 0 20px rgba(242,183,5,0.2);
        }
        .stat-number {
            font-family: var(--font-family-numeric);
            font-size: 2.4rem;
            font-weight: 800;
            color: var(--accent-gold);
            line-height: 1.2;
            letter-spacing: -0.02em;
            margin-bottom: 6px;
        }
        .stat-label {
            font-size: 0.9rem;
            color: var(--text-secondary);
            letter-spacing: 0.02em;
        }

        /* Tag Cloud */
        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
            max-width: 700px;
            margin: 0 auto;
        }
        .tag-chip {
            background: var(--bg-elevated);
            color: var(--text-secondary);
            border: 1px solid var(--border-subtle);
            border-radius: 999px;
            padding: 8px 20px;
            font-size: 0.9rem;
            font-weight: 500;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: background-color 0.25s ease, color 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
        }
        .tag-chip:hover, .tag-chip:focus {
            background: rgba(255,77,46,0.1);
            color: var(--text-primary);
            border-color: var(--accent-neon);
            box-shadow: 0 0 16px var(--shadow-glow);
        }

        /* CTA Box */
        .cta-box {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            padding: 56px 48px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-box::before {
            content: "";
            position: absolute;
            top: -60px;
            right: -60px;
            width: 200px;
            height: 200px;
            background: radial-gradient(circle, rgba(255,77,46,0.2) 0%, transparent 70%);
            pointer-events: none;
            border-radius: 50%;
        }
        .cta-box h2 {
            font-size: 1.8rem;
            font-weight: 800;
            letter-spacing: -0.01em;
            margin-bottom: 12px;
            position: relative;
            z-index: 1;
        }
        .cta-box p {
            color: var(--text-secondary);
            max-width: 560px;
            margin: 0 auto 28px;
            position: relative;
            z-index: 1;
        }
        .subscribe-form {
            display: flex;
            gap: 12px;
            max-width: 460px;
            margin: 0 auto;
            flex-wrap: wrap;
            justify-content: center;
            position: relative;
            z-index: 1;
        }
        .subscribe-form input[type="email"] {
            flex: 1;
            min-width: 220px;
            padding: 13px 20px;
            border-radius: 999px;
            border: 1px solid var(--border-subtle);
            background: var(--bg-primary);
            color: var(--text-primary);
            font-size: 0.95rem;
            transition: border-color 0.25s ease, box-shadow 0.25s ease;
        }
        .subscribe-form input[type="email"]::placeholder {
            color: var(--text-muted);
        }
        .subscribe-form input[type="email"]:focus {
            outline: none;
            border-color: var(--accent-cyan);
            box-shadow: 0 0 0 3px rgba(46,230,214,0.2);
        }
        .btn-subscribe {
            background: var(--accent-neon);
            color: #FFFFFF;
            border-radius: 999px;
            padding: 13px 32px;
            font-size: 0.95rem;
            font-weight: 700;
            transition: background-color 0.25s ease, box-shadow 0.25s ease, transform 0.2s ease;
            white-space: nowrap;
        }
        .btn-subscribe:hover, .btn-subscribe:focus {
            background-color: #e6401d;
            box-shadow: 0 0 20px var(--shadow-glow);
            transform: translateY(-1px);
            color: #FFFFFF;
        }

        /* About Section */
        .about-column {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 36px 32px;
        }
        .about-column h3 {
            font-size: 1.4rem;
            font-weight: 700;
            margin-bottom: 16px;
            color: var(--text-primary);
        }
        .about-column p {
            font-size: 1rem;
            color: var(--text-secondary);
            line-height: 1.9;
            margin-bottom: 16px;
        }
        .about-column p:last-child {
            margin-bottom: 0;
        }
        .about-image-wrap {
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--border-subtle);
            height: 100%;
            min-height: 260px;
            background-color: var(--bg-elevated);
        }
        .about-image-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        /* Footer */
        .site-footer {
            background: #0A0909;
            border-top: 1px solid var(--border-subtle);
            padding-top: 56px;
            padding-bottom: 32px;
            margin-top: 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
            gap: 36px;
            padding-bottom: 36px;
            border-bottom: 1px solid var(--border-subtle);
        }
        .footer-brand-name {
            font-size: 1.35rem;
            font-weight: 800;
            letter-spacing: 0.02em;
            color: var(--text-primary);
            margin-bottom: 10px;
        }
        .footer-brand-text {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.75;
            max-width: 300px;
        }
        .footer-col-title {
            font-size: 0.85rem;
            font-weight: 700;
            letter-spacing: 0.04em;
            text-transform: uppercase;
            color: var(--text-muted);
            margin-bottom: 14px;
        }
        .footer-col-link {
            display: block;
            font-size: 0.9rem;
            color: var(--text-secondary);
            padding: 4px 0;
            transition: color 0.2s ease;
        }
        .footer-col-link:hover, .footer-col-link:focus {
            color: var(--accent-gold);
        }
        .footer-bottom {
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
        }
        .footer-copyright {
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            :root {
                --spacing-section: 64px;
            }
            .banner-content h1 {
                font-size: 2.25rem;
            }
            .guide-card-img {
                width: 220px;
                min-height: 180px;
            }
            .guide-card-body {
                padding: 20px 22px;
            }
            .guide-card-title {
                font-size: 1.2rem;
            }
            .footer-grid {
                grid-template-columns: 2fr 1fr 1fr;
                gap: 28px;
            }
        }
        @media (max-width: 768px) {
            :root {
                --spacing-section: 48px;
            }
            .header-inner {
                flex-wrap: wrap;
                gap: 12px;
            }
            .nav-chip-bar {
                order: 3;
                width: 100%;
                overflow-x: auto;
                flex-wrap: nowrap;
                justify-content: flex-start;
                padding-bottom: 4px;
                -webkit-overflow-scrolling: touch;
                scrollbar-width: thin;
                scrollbar-color: var(--border-subtle) transparent;
            }
            .nav-chip-bar::-webkit-scrollbar {
                height: 4px;
            }
            .nav-chip-bar::-webkit-scrollbar-track {
                background: transparent;
            }
            .nav-chip-bar::-webkit-scrollbar-thumb {
                background-color: var(--border-subtle);
                border-radius: 4px;
            }
            .header-cta {
                padding: 8px 18px;
                font-size: 0.85rem;
            }
            .category-banner {
                padding: 56px 0 64px;
            }
            .banner-content h1 {
                font-size: 2rem;
            }
            .banner-subtitle {
                font-size: 1rem;
            }
            .guide-card {
                flex-direction: column;
            }
            .guide-card-img {
                width: 100%;
                min-height: 200px;
                max-height: 240px;
            }
            .guide-card-body {
                padding: 20px;
            }
            .guide-card-title {
                font-size: 1.15rem;
            }
            .stat-number {
                font-size: 1.9rem;
            }
            .cta-box {
                padding: 40px 24px;
            }
            .cta-box h2 {
                font-size: 1.4rem;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
            .footer-grid > div:first-child {
                grid-column: 1 / -1;
            }
        }
        @media (max-width: 520px) {
            .banner-content h1 {
                font-size: 1.75rem;
            }
            .section-title {
                font-size: 1.55rem;
            }
            .breadcrumb-custom {
                font-size: 0.8rem;
                margin-bottom: 18px;
            }
            .guide-card-img {
                min-height: 160px;
            }
            .guide-card-body {
                padding: 16px;
            }
            .guide-card-title {
                font-size: 1.05rem;
            }
            .guide-card-excerpt {
                font-size: 0.88rem;
            }
            .badge-date, .badge-heat {
                font-size: 0.72rem;
                padding: 3px 10px;
            }
            .subscribe-form {
                flex-direction: column;
            }
            .subscribe-form input[type="email"] {
                width: 100%;
                min-width: auto;
            }
            .btn-subscribe {
                width: 100%;
                justify-content: center;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .stat-number {
                font-size: 1.6rem;
            }
            .cta-box {
                padding: 32px 18px;
                border-radius: var(--radius-md);
            }
            .tag-chip {
                padding: 6px 14px;
                font-size: 0.8rem;
            }
        }

/* roulang page: category4 */
:root {
            --bg-primary: #0F0E0E;
            --bg-card: #1B1A1F;
            --bg-elevated: #232229;
            --text-primary: #F2F0E8;
            --text-secondary: #A8A6AD;
            --text-muted: #6E6C74;
            --accent-neon: #FF4D2E;
            --accent-gold: #F2B705;
            --accent-cyan: #2EE6D6;
            --border-subtle: #3A3942;
            --border-hover: #FF4D2E;
            --shadow-dark: rgba(0, 0, 0, 0.45);
            --shadow-glow: rgba(255, 77, 46, 0.35);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --spacing-section: 88px;
            --container-max: 1200px;
            --font-family-base: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            --font-family-numeric: "SF Mono", "Roboto Mono", "PingFang SC", monospace;
        }

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-family-base);
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.8;
            font-size: 1rem;
            font-weight: 400;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        a {
            color: var(--text-primary);
            text-decoration: none;
            transition: color 0.25s ease, border-color 0.25s ease, opacity 0.25s ease;
        }

        a:hover,
        a:focus {
            color: var(--accent-gold);
            text-decoration: none;
        }

        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 2px;
        }

        button {
            font-family: inherit;
            cursor: pointer;
            border: none;
            background: none;
        }

        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding-left: 20px;
            padding-right: 20px;
        }

        .section {
            padding-top: var(--spacing-section);
            padding-bottom: var(--spacing-section);
            position: relative;
        }

        .section-alt {
            background-color: var(--bg-card);
        }

        .section-tight {
            padding-top: 56px;
            padding-bottom: 56px;
        }

        .section-divider {
            border-top: 1px solid var(--border-subtle);
        }

        .eyebrow {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            font-weight: 600;
            letter-spacing: 0.06em;
            text-transform: uppercase;
            color: var(--accent-cyan);
            margin-bottom: 16px;
        }

        .eyebrow::before {
            content: "";
            width: 28px;
            height: 2px;
            background: var(--accent-cyan);
            flex-shrink: 0;
        }

        .section-title {
            font-size: 2rem;
            font-weight: 800;
            line-height: 1.3;
            letter-spacing: -0.01em;
            margin-bottom: 12px;
            color: var(--text-primary);
        }

        .section-subtitle {
            font-size: 1.1rem;
            color: var(--text-secondary);
            max-width: 720px;
            line-height: 1.85;
        }

        .text-center .section-subtitle {
            margin-left: auto;
            margin-right: auto;
        }

        /* Header & Navigation */
        .site-header {
            background: rgba(15, 14, 14, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-subtle);
            position: sticky;
            top: 0;
            z-index: 1050;
            padding: 12px 0;
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
        }

        .logo-brand {
            font-size: 1.5rem;
            font-weight: 800;
            letter-spacing: 0.02em;
            color: var(--text-primary);
            white-space: nowrap;
            transition: color 0.25s ease;
            position: relative;
        }

        .logo-brand::after {
            content: "";
            position: absolute;
            bottom: -3px;
            left: 0;
            width: 34px;
            height: 2px;
            background: var(--accent-neon);
            border-radius: 2px;
            transition: width 0.3s ease;
        }

        .logo-brand:hover,
        .logo-brand:focus {
            color: var(--accent-gold);
        }

        .logo-brand:hover::after,
        .logo-brand:focus::after {
            width: 100%;
        }

        .nav-chip-bar {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-wrap: wrap;
            justify-content: center;
        }

        .nav-chip {
            background: transparent;
            color: var(--text-secondary);
            border: 1px solid var(--border-subtle);
            border-radius: 999px;
            padding: 8px 18px;
            font-size: 0.925rem;
            font-weight: 500;
            transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
            white-space: nowrap;
        }

        .nav-chip:hover,
        .nav-chip:focus {
            color: var(--text-primary);
            border-color: var(--accent-neon);
            background-color: rgba(255, 77, 46, 0.08);
            box-shadow: 0 0 14px var(--shadow-glow);
        }

        .nav-chip.active {
            background: var(--accent-neon);
            color: #FFFFFF;
            border-color: var(--accent-neon);
            font-weight: 600;
            box-shadow: 0 0 20px var(--shadow-glow);
        }

        .header-cta {
            background: var(--accent-neon);
            color: #FFFFFF;
            border-radius: 999px;
            padding: 10px 22px;
            font-size: 0.9rem;
            font-weight: 600;
            transition: background-color 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease;
            white-space: nowrap;
            display: inline-block;
        }

        .header-cta:hover,
        .header-cta:focus {
            background-color: #E63920;
            color: #FFFFFF;
            box-shadow: 0 6px 22px var(--shadow-glow);
            transform: translateY(-2px);
        }

        /* Breadcrumb */
        .breadcrumb-wrap {
            padding: 20px 0 0;
            background: var(--bg-primary);
        }

        .breadcrumb-custom {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.875rem;
            color: var(--text-muted);
            margin: 0;
            padding: 0;
            list-style: none;
        }

        .breadcrumb-custom a {
            color: var(--text-secondary);
            transition: color 0.2s ease;
        }

        .breadcrumb-custom a:hover {
            color: var(--accent-gold);
        }

        .breadcrumb-custom .sep {
            color: var(--text-muted);
            user-select: none;
        }

        .breadcrumb-custom .current {
            color: var(--accent-cyan);
            font-weight: 500;
        }

        /* Category Hero Banner */
        .category-banner {
            background: linear-gradient(135deg, #1B1A1F 0%, #0F0E0E 60%, #1B1A1F 100%);
            border-bottom: 1px solid var(--border-subtle);
            padding: 56px 0 48px;
            position: relative;
            overflow: hidden;
        }

        .category-banner::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background-image: url('/assets/images/53fa2dcfece1296e.webp');
            background-size: cover;
            background-position: center 30%;
            opacity: 0.12;
            pointer-events: none;
        }

        .category-banner .container {
            position: relative;
            z-index: 2;
        }

        .category-banner h1 {
            font-size: 2.6rem;
            font-weight: 800;
            letter-spacing: -0.01em;
            margin-bottom: 12px;
            color: var(--text-primary);
        }

        .category-banner .banner-sub {
            font-size: 1.1rem;
            color: var(--text-secondary);
            max-width: 680px;
            line-height: 1.85;
        }

        .banner-meta {
            display: flex;
            gap: 16px;
            align-items: center;
            margin-top: 18px;
            flex-wrap: wrap;
        }

        .banner-meta-item {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 0.875rem;
            color: var(--text-muted);
            border: 1px solid var(--border-subtle);
            border-radius: 999px;
            padding: 6px 14px;
            background: rgba(27, 26, 31, 0.7);
        }

        .banner-meta-item .dot {
            width: 6px;
            height: 6px;
            border-radius: 50%;
            background: var(--accent-cyan);
            flex-shrink: 0;
        }

        /* Article list cards */
        .article-list-section {
            background: var(--bg-primary);
        }

        .article-list-card {
            display: flex;
            gap: 24px;
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 20px;
            margin-bottom: 20px;
            transition: border-color 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease;
            overflow: hidden;
        }

        .article-list-card:hover {
            border-color: var(--border-hover);
            box-shadow: 0 0 18px var(--shadow-glow);
            transform: translateY(-3px);
        }

        .article-list-thumb {
            width: 220px;
            min-width: 220px;
            height: 150px;
            border-radius: var(--radius-sm);
            overflow: hidden;
            background: var(--bg-elevated);
            flex-shrink: 0;
        }

        .article-list-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }

        .article-list-card:hover .article-list-thumb img {
            transform: scale(1.04);
        }

        .article-list-body {
            flex: 1;
            display: flex;
            flex-direction: column;
            justify-content: center;
            min-width: 0;
        }

        .article-list-title {
            font-size: 1.25rem;
            font-weight: 600;
            line-height: 1.45;
            margin-bottom: 10px;
            color: var(--text-primary);
            transition: color 0.2s ease;
        }

        .article-list-card:hover .article-list-title {
            color: var(--accent-gold);
        }

        .article-list-excerpt {
            font-size: 0.915rem;
            color: var(--text-secondary);
            line-height: 1.75;
            margin-bottom: 12px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .article-list-meta {
            display: flex;
            align-items: center;
            gap: 14px;
            flex-wrap: wrap;
        }

        .article-date {
            font-size: 0.8rem;
            color: var(--text-muted);
            font-family: var(--font-family-numeric);
        }

        .article-tag {
            display: inline-block;
            font-size: 0.75rem;
            font-weight: 600;
            color: var(--accent-cyan);
            background: rgba(46, 230, 214, 0.08);
            border: 1px solid rgba(46, 230, 214, 0.25);
            border-radius: 999px;
            padding: 3px 12px;
            letter-spacing: 0.02em;
        }

        .article-tag.neon {
            color: var(--accent-neon);
            background: rgba(255, 77, 46, 0.08);
            border-color: rgba(255, 77, 46, 0.25);
        }

        .article-tag.gold {
            color: var(--accent-gold);
            background: rgba(242, 183, 5, 0.08);
            border-color: rgba(242, 183, 5, 0.25);
        }

        .heat-badge {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            font-size: 0.75rem;
            font-weight: 600;
            color: var(--accent-neon);
            background: rgba(255, 77, 46, 0.08);
            border-radius: 4px;
            padding: 2px 8px;
        }

        .heat-badge::before {
            content: "🔥";
            font-size: 0.7rem;
        }

        /* Leaderboard summary section */
        .leaderboard-section {
            background: var(--bg-card);
            border-top: 1px solid var(--border-subtle);
            border-bottom: 1px solid var(--border-subtle);
        }

        .leaderboard-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .leaderboard-card {
            background: var(--bg-elevated);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 24px;
            transition: border-color 0.25s ease, box-shadow 0.25s ease;
        }

        .leaderboard-card:hover {
            border-color: var(--border-hover);
            box-shadow: 0 0 16px var(--shadow-glow);
        }

        .leaderboard-card-title {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 16px;
            color: var(--text-primary);
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .leaderboard-card-title .icon-indicator {
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background: var(--accent-gold);
            flex-shrink: 0;
        }

        .leaderboard-list {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .leaderboard-list li {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 8px 0;
            border-bottom: 1px solid rgba(58, 57, 66, 0.5);
            font-size: 0.9rem;
            color: var(--text-secondary);
        }

        .leaderboard-list li:last-child {
            border-bottom: none;
        }

        .leaderboard-rank {
            font-family: var(--font-family-numeric);
            font-weight: 700;
            color: var(--accent-gold);
            width: 28px;
            flex-shrink: 0;
        }

        .leaderboard-name {
            flex: 1;
            text-align: left;
            padding-left: 4px;
        }

        .leaderboard-value {
            font-family: var(--font-family-numeric);
            font-weight: 600;
            color: var(--accent-cyan);
            white-space: nowrap;
        }

        /* Data brief section */
        .data-brief-section {
            background: var(--bg-primary);
        }

        .data-brief-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        .data-brief-item {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 22px;
            text-align: center;
            transition: border-color 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease;
        }

        .data-brief-item:hover {
            border-color: var(--border-hover);
            box-shadow: 0 0 14px var(--shadow-glow);
            transform: translateY(-2px);
        }

        .data-brief-value {
            font-family: var(--font-family-numeric);
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--accent-neon);
            line-height: 1.2;
            margin-bottom: 6px;
        }

        .data-brief-label {
            font-size: 0.875rem;
            color: var(--text-secondary);
            font-weight: 500;
        }

        /* Tags & topics section */
        .tags-topics-section {
            background: var(--bg-card);
            border-top: 1px solid var(--border-subtle);
        }

        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }

        .tag-cloud .tag-item {
            display: inline-block;
            background: transparent;
            color: var(--text-secondary);
            border: 1px solid var(--border-subtle);
            border-radius: 999px;
            padding: 6px 16px;
            font-size: 0.85rem;
            font-weight: 500;
            transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
        }

        .tag-cloud .tag-item:hover {
            color: var(--text-primary);
            border-color: var(--accent-neon);
            background-color: rgba(255, 77, 46, 0.08);
        }

        .topic-list {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 16px;
        }

        .topic-card {
            background: var(--bg-elevated);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 20px;
            transition: border-color 0.25s ease, box-shadow 0.25s ease;
        }

        .topic-card:hover {
            border-color: var(--accent-gold);
            box-shadow: 0 0 12px rgba(242, 183, 5, 0.2);
        }

        .topic-card-title {
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 8px;
            color: var(--text-primary);
        }

        .topic-card-desc {
            font-size: 0.875rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* Category description section */
        .category-desc-section {
            background: var(--bg-primary);
            border-top: 1px solid var(--border-subtle);
        }

        .category-desc-box {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-left: 3px solid var(--accent-neon);
            border-radius: var(--radius-md);
            padding: 32px;
            max-width: 900px;
        }

        .category-desc-box p {
            font-size: 1rem;
            color: var(--text-secondary);
            line-height: 1.95;
            margin-bottom: 16px;
        }

        .category-desc-box p:last-child {
            margin-bottom: 0;
        }

        /* CTA section */
        .cta-zone {
            background: linear-gradient(135deg, #1B1A1F 0%, #0F0E0E 70%);
            border-top: 1px solid var(--border-subtle);
            padding: 64px 0;
        }

        .cta-box {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 32px;
            flex-wrap: wrap;
        }

        .cta-text h2 {
            font-size: 1.8rem;
            font-weight: 800;
            margin-bottom: 8px;
            color: var(--text-primary);
        }

        .cta-text p {
            font-size: 1rem;
            color: var(--text-secondary);
            margin-bottom: 0;
            max-width: 500px;
        }

        .cta-form {
            display: flex;
            gap: 10px;
            align-items: center;
            flex-wrap: wrap;
        }

        .cta-form input {
            background: var(--bg-elevated);
            border: 1px solid var(--border-subtle);
            border-radius: 999px;
            padding: 12px 20px;
            font-size: 0.9rem;
            color: var(--text-primary);
            width: 280px;
            transition: border-color 0.25s ease, box-shadow 0.25s ease;
        }

        .cta-form input::placeholder {
            color: var(--text-muted);
        }

        .cta-form input:focus {
            outline: none;
            border-color: var(--accent-cyan);
            box-shadow: 0 0 0 3px rgba(46, 230, 214, 0.15);
        }

        .cta-button {
            background: var(--accent-neon);
            color: #FFFFFF;
            border-radius: 999px;
            padding: 12px 28px;
            font-size: 0.95rem;
            font-weight: 600;
            transition: background-color 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease;
            white-space: nowrap;
        }

        .cta-button:hover,
        .cta-button:focus {
            background-color: #E63920;
            color: #FFFFFF;
            box-shadow: 0 6px 22px var(--shadow-glow);
            transform: translateY(-2px);
        }

        /* Footer */
        .site-footer {
            background: #0A0909;
            border-top: 1px solid var(--border-subtle);
            padding: 56px 0 24px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 40px;
        }

        .footer-brand-name {
            font-size: 1.3rem;
            font-weight: 800;
            color: var(--text-primary);
            margin-bottom: 12px;
        }

        .footer-brand-text {
            font-size: 0.875rem;
            color: var(--text-muted);
            line-height: 1.75;
            max-width: 300px;
        }

        .footer-col-title {
            font-size: 0.9rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 14px;
            letter-spacing: 0.04em;
        }

        .footer-col-link {
            display: block;
            font-size: 0.875rem;
            color: var(--text-secondary);
            margin-bottom: 8px;
            transition: color 0.2s ease;
        }

        .footer-col-link:hover,
        .footer-col-link:focus {
            color: var(--accent-gold);
        }

        .footer-bottom {
            border-top: 1px solid var(--border-subtle);
            padding-top: 20px;
            text-align: center;
        }

        .footer-copyright {
            font-size: 0.8rem;
            color: var(--text-muted);
            font-family: var(--font-family-numeric);
        }

        /* Responsive breakpoints */
        @media (max-width: 992px) {
            .leaderboard-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .data-brief-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .topic-list {
                grid-template-columns: 1fr;
            }

            .footer-grid {
                grid-template-columns: 2fr 1fr 1fr;
                gap: 24px;
            }

            .header-inner {
                flex-wrap: wrap;
                justify-content: center;
            }

            .nav-chip-bar {
                order: 3;
                width: 100%;
            }

            .article-list-card {
                flex-direction: column;
            }

            .article-list-thumb {
                width: 100%;
                min-width: unset;
                height: 180px;
            }
        }

        @media (max-width: 768px) {
            :root {
                --spacing-section: 56px;
            }

            .category-banner h1 {
                font-size: 2rem;
            }

            .section-title {
                font-size: 1.6rem;
            }

            .leaderboard-grid {
                grid-template-columns: 1fr;
            }

            .data-brief-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }

            .cta-box {
                flex-direction: column;
                align-items: flex-start;
            }

            .cta-form {
                width: 100%;
            }

            .cta-form input {
                width: 100%;
            }

            .header-cta {
                padding: 8px 16px;
                font-size: 0.8rem;
            }

            .nav-chip {
                padding: 6px 14px;
                font-size: 0.8rem;
            }

            .article-list-title {
                font-size: 1.1rem;
            }

            .article-list-card {
                padding: 16px;
                gap: 16px;
            }

            .article-list-thumb {
                height: 140px;
            }
        }

        @media (max-width: 520px) {
            .data-brief-grid {
                grid-template-columns: 1fr;
            }

            .data-brief-value {
                font-size: 1.8rem;
            }

            .category-banner {
                padding: 36px 0 32px;
            }

            .category-banner h1 {
                font-size: 1.7rem;
            }

            .banner-meta {
                gap: 8px;
            }

            .banner-meta-item {
                font-size: 0.75rem;
                padding: 4px 10px;
            }

            .article-list-meta {
                gap: 8px;
            }

            .heat-badge {
                font-size: 0.7rem;
            }

            .article-date {
                font-size: 0.7rem;
            }

            .article-tag {
                font-size: 0.68rem;
                padding: 2px 8px;
            }

            .leaderboard-card {
                padding: 16px;
            }

            .category-desc-box {
                padding: 20px;
            }

            .cta-zone {
                padding: 40px 0;
            }

            .cta-text h2 {
                font-size: 1.4rem;
            }
        }

/* roulang page: category3 */
:root {
            --bg-primary: #0F0E0E;
            --bg-card: #1B1A1F;
            --bg-elevated: #232229;
            --text-primary: #F2F0E8;
            --text-secondary: #A8A6AD;
            --text-muted: #6E6C74;
            --accent-neon: #FF4D2E;
            --accent-gold: #F2B705;
            --accent-cyan: #2EE6D6;
            --border-subtle: #3A3942;
            --border-hover: #FF4D2E;
            --shadow-dark: rgba(0,0,0,0.45);
            --shadow-glow: rgba(255,77,46,0.35);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --spacing-section: 88px;
            --container-max: 1200px;
            --font-family-base: "PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
            --font-family-numeric: "SF Mono","Roboto Mono","PingFang SC",monospace;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font-family-base);
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.8;
            font-size: 1rem;
            font-weight: 400;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: var(--text-primary);
            text-decoration: none;
            transition: color 0.25s ease, border-color 0.25s ease, opacity 0.25s ease, background-color 0.25s ease, box-shadow 0.25s ease;
        }
        a:hover,
        a:focus {
            color: var(--accent-gold);
            text-decoration: none;
        }
        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 2px;
        }
        button {
            font-family: inherit;
            cursor: pointer;
            border: none;
            background: none;
        }
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding-left: 20px;
            padding-right: 20px;
        }
        .section {
            padding-top: var(--spacing-section);
            padding-bottom: var(--spacing-section);
            position: relative;
        }
        .section-alt {
            background-color: var(--bg-card);
        }
        .section-tight {
            padding-top: 56px;
            padding-bottom: 56px;
        }
        .section-divider {
            border-top: 1px solid var(--border-subtle);
        }
        .eyebrow {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            font-weight: 600;
            letter-spacing: 0.06em;
            text-transform: uppercase;
            color: var(--accent-cyan);
            margin-bottom: 16px;
        }
        .eyebrow::before {
            content: "";
            width: 28px;
            height: 2px;
            background: var(--accent-cyan);
            flex-shrink: 0;
        }
        .section-title {
            font-size: 2rem;
            font-weight: 800;
            line-height: 1.3;
            letter-spacing: -0.01em;
            margin-bottom: 12px;
            color: var(--text-primary);
        }
        .section-subtitle {
            font-size: 1.1rem;
            color: var(--text-secondary);
            max-width: 720px;
            line-height: 1.85;
        }
        .text-center .section-subtitle {
            margin-left: auto;
            margin-right: auto;
        }

        /* Header & Navigation */
        .site-header {
            background: rgba(15,14,14,0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-subtle);
            position: sticky;
            top: 0;
            z-index: 1050;
            padding: 12px 0;
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
            flex-wrap: wrap;
        }
        .logo-brand {
            font-size: 1.5rem;
            font-weight: 800;
            letter-spacing: 0.02em;
            color: var(--text-primary);
            white-space: nowrap;
            transition: color 0.25s ease;
            position: relative;
        }
        .logo-brand::after {
            content: "";
            position: absolute;
            bottom: -3px;
            left: 0;
            width: 34px;
            height: 2px;
            background: var(--accent-neon);
            border-radius: 2px;
            transition: width 0.3s ease;
        }
        .logo-brand:hover,
        .logo-brand:focus {
            color: var(--accent-gold);
        }
        .logo-brand:hover::after,
        .logo-brand:focus::after {
            width: 100%;
        }
        .nav-chip-bar {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-wrap: wrap;
            justify-content: center;
        }
        .nav-chip {
            background: transparent;
            color: var(--text-secondary);
            border: 1px solid var(--border-subtle);
            border-radius: 999px;
            padding: 8px 18px;
            font-size: 0.925rem;
            font-weight: 500;
            transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
            white-space: nowrap;
        }
        .nav-chip:hover,
        .nav-chip:focus {
            color: var(--text-primary);
            border-color: var(--accent-neon);
            background-color: rgba(255,77,46,0.08);
            box-shadow: 0 0 14px var(--shadow-glow);
        }
        .nav-chip.active {
            background: var(--accent-neon);
            color: #FFFFFF;
            border-color: var(--accent-neon);
            font-weight: 600;
            box-shadow: 0 0 20px var(--shadow-glow);
        }
        .header-cta {
            background: var(--accent-neon);
            color: #FFFFFF;
            border-radius: 999px;
            padding: 10px 22px;
            font-size: 0.9rem;
            font-weight: 600;
            transition: background-color 0.25s ease, box-shadow 0.25s ease, transform 0.2s ease;
            white-space: nowrap;
        }
        .header-cta:hover,
        .header-cta:focus {
            background: #FF6A4D;
            color: #FFFFFF;
            box-shadow: 0 0 18px var(--shadow-glow);
            transform: translateY(-2px);
        }

        /* Breadcrumb */
        .breadcrumb-bar {
            background-color: transparent;
            padding: 16px 0 0 0;
            margin-bottom: 0;
        }
        .breadcrumb-bar .breadcrumb {
            margin-bottom: 0;
            font-size: 0.88rem;
        }
        .breadcrumb-bar .breadcrumb-item a {
            color: var(--text-secondary);
        }
        .breadcrumb-bar .breadcrumb-item a:hover {
            color: var(--accent-gold);
        }
        .breadcrumb-bar .breadcrumb-item.active {
            color: var(--text-muted);
        }
        .breadcrumb-bar .breadcrumb-item + .breadcrumb-item::before {
            color: var(--text-muted);
            content: ">";
        }

        /* 分类页 H1 横幅 */
        .category-banner {
            background-color: var(--bg-card);
            border-bottom: 1px solid var(--border-subtle);
            padding: 56px 0 48px;
            position: relative;
            overflow: hidden;
        }
        .category-banner::after {
            content: "";
            position: absolute;
            top: 0;
            right: 0;
            width: 45%;
            height: 100%;
            background: radial-gradient(ellipse at center, rgba(255,77,46,0.08) 0%, transparent 70%);
            pointer-events: none;
            z-index: 0;
        }
        .category-banner .container {
            position: relative;
            z-index: 1;
        }
        .category-banner .banner-title {
            font-size: 2.25rem;
            font-weight: 800;
            letter-spacing: -0.01em;
            color: var(--text-primary);
            margin-bottom: 12px;
            line-height: 1.25;
        }
        .category-banner .banner-subtitle {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 680px;
            line-height: 1.85;
            margin-bottom: 0;
        }
        .category-banner .banner-meta {
            display: flex;
            gap: 20px;
            align-items: center;
            margin-top: 18px;
            flex-wrap: wrap;
        }
        .category-banner .banner-meta .meta-item {
            display: flex;
            align-items: center;
            gap: 8px;
            color: var(--text-secondary);
            font-size: 0.85rem;
        }
        .category-banner .banner-meta .meta-dot {
            width: 6px;
            height: 6px;
            border-radius: 50%;
            background: var(--accent-cyan);
            flex-shrink: 0;
        }

        /* 文章列表卡片 */
        .article-list-card {
            background-color: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
            display: flex;
            flex-direction: column;
            height: 100%;
        }
        .article-list-card:hover,
        .article-list-card:focus-within {
            transform: translateY(-4px);
            border-color: var(--border-hover);
            box-shadow: 0 0 22px var(--shadow-glow);
        }
        .article-list-card .card-cover {
            width: 100%;
            aspect-ratio: 16 / 9;
            object-fit: cover;
            background-color: var(--bg-elevated);
            position: relative;
            overflow: hidden;
        }
        .article-list-card .card-cover img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }
        .article-list-card:hover .card-cover img,
        .article-list-card:focus-within .card-cover img {
            transform: scale(1.04);
        }
        .article-list-card .card-body {
            padding: 22px 20px 20px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }
        .article-list-card .card-tags {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
            margin-bottom: 12px;
        }
        .article-list-card .card-tag {
            font-size: 0.75rem;
            font-weight: 600;
            padding: 4px 12px;
            border-radius: 999px;
            background-color: rgba(242,183,5,0.12);
            color: var(--accent-gold);
            border: 1px solid rgba(242,183,5,0.22);
            letter-spacing: 0.02em;
        }
        .article-list-card .card-tag.tag-neon {
            background-color: rgba(255,77,46,0.12);
            color: #FF6A4D;
            border-color: rgba(255,77,46,0.25);
        }
        .article-list-card .card-title {
            font-size: 1.1rem;
            font-weight: 700;
            line-height: 1.45;
            color: var(--text-primary);
            margin-bottom: 10px;
            letter-spacing: -0.005em;
        }
        .article-list-card .card-desc {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.75;
            margin-bottom: 14px;
            flex: 1;
        }
        .article-list-card .card-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            flex-wrap: wrap;
            border-top: 1px solid var(--border-subtle);
            padding-top: 14px;
            margin-top: auto;
        }
        .article-list-card .card-date {
            font-size: 0.8rem;
            color: var(--text-muted);
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .article-list-card .card-heat {
            display: flex;
            align-items: center;
            gap: 6px;
            font-size: 0.8rem;
            color: var(--accent-cyan);
            font-weight: 600;
        }
        .article-list-card .card-heat::before {
            content: "🔥";
            font-size: 0.85rem;
        }

        /* 查看更多按钮 */
        .btn-more-wrap {
            text-align: center;
            margin-top: 40px;
        }
        .btn-more {
            background: transparent;
            color: var(--accent-gold);
            border: 1px solid var(--accent-gold);
            border-radius: 999px;
            padding: 12px 32px;
            font-size: 0.95rem;
            font-weight: 600;
            transition: background-color 0.25s ease, color 0.25s ease, box-shadow 0.25s ease, transform 0.2s ease;
        }
        .btn-more:hover,
        .btn-more:focus {
            background-color: rgba(242,183,5,0.1);
            color: var(--accent-gold);
            box-shadow: 0 0 16px rgba(242,183,5,0.2);
            transform: translateY(-2px);
        }

        /* 成长路线图板块 */
        .roadmap-card {
            background-color: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 28px 24px;
            transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
            height: 100%;
            position: relative;
            overflow: hidden;
        }
        .roadmap-card::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 4px;
            height: 100%;
            background: var(--accent-neon);
            border-radius: 2px 0 0 2px;
        }
        .roadmap-card:hover,
        .roadmap-card:focus-within {
            transform: translateY(-4px);
            border-color: var(--border-hover);
            box-shadow: 0 0 20px var(--shadow-glow);
        }
        .roadmap-card .roadmap-icon {
            width: 44px;
            height: 44px;
            border-radius: 10px;
            background-color: rgba(255,77,46,0.15);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            color: var(--accent-neon);
            margin-bottom: 16px;
            font-weight: 700;
        }
        .roadmap-card .roadmap-title {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 10px;
            letter-spacing: -0.005em;
        }
        .roadmap-card .roadmap-desc {
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 0;
        }

        /* 训练方法/职业路径 */
        .method-item {
            display: flex;
            align-items: flex-start;
            gap: 14px;
            padding: 16px 0;
            border-bottom: 1px solid var(--border-subtle);
            transition: padding-left 0.25s ease;
        }
        .method-item:last-child {
            border-bottom: none;
        }
        .method-item:hover {
            padding-left: 8px;
        }
        .method-item .method-num {
            width: 36px;
            height: 36px;
            flex-shrink: 0;
            border-radius: 50%;
            background-color: rgba(46,230,214,0.1);
            color: var(--accent-cyan);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 0.95rem;
            font-family: var(--font-family-numeric);
        }
        .method-item .method-content h4 {
            font-size: 0.98rem;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 4px;
            letter-spacing: -0.005em;
        }
        .method-item .method-content p {
            font-size: 0.86rem;
            color: var(--text-secondary);
            line-height: 1.65;
            margin-bottom: 0;
        }

        /* 数据短报 */
        .data-brief-card {
            background-color: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 24px;
            text-align: center;
            transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
        }
        .data-brief-card:hover {
            transform: translateY(-4px);
            border-color: var(--border-hover);
            box-shadow: 0 0 20px var(--shadow-glow);
        }
        .data-brief-card .data-value {
            font-size: 2.2rem;
            font-weight: 800;
            font-family: var(--font-family-numeric);
            color: var(--accent-neon);
            line-height: 1.2;
            margin-bottom: 6px;
            letter-spacing: -0.02em;
        }
        .data-brief-card .data-label {
            font-size: 0.82rem;
            color: var(--text-secondary);
            line-height: 1.5;
            margin-bottom: 0;
        }

        /* 订阅 CTA */
        .cta-subscribe {
            background-color: var(--bg-elevated);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            padding: 44px 36px;
            position: relative;
            overflow: hidden;
        }
        .cta-subscribe::before {
            content: "";
            position: absolute;
            top: -40%;
            right: -10%;
            width: 380px;
            height: 380px;
            background: radial-gradient(circle, rgba(255,77,46,0.18) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .cta-subscribe .cta-inner {
            position: relative;
            z-index: 1;
            max-width: 520px;
        }
        .cta-subscribe .cta-title {
            font-size: 1.4rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 10px;
            letter-spacing: -0.005em;
        }
        .cta-subscribe .cta-text {
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.75;
            margin-bottom: 20px;
        }
        .cta-subscribe .form-row-inline {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
        }
        .cta-subscribe .form-input {
            flex: 1;
            min-width: 220px;
            background-color: var(--bg-primary);
            border: 1px solid var(--border-subtle);
            border-radius: 999px;
            padding: 11px 20px;
            font-size: 0.9rem;
            color: var(--text-primary);
            font-family: inherit;
            transition: border-color 0.25s ease, box-shadow 0.25s ease;
        }
        .cta-subscribe .form-input::placeholder {
            color: var(--text-muted);
        }
        .cta-subscribe .form-input:focus {
            outline: none;
            border-color: var(--accent-cyan);
            box-shadow: 0 0 0 3px rgba(46,230,214,0.12);
        }
        .cta-subscribe .form-btn {
            background: var(--accent-neon);
            color: #FFFFFF;
            border-radius: 999px;
            padding: 11px 28px;
            font-size: 0.9rem;
            font-weight: 600;
            border: none;
            transition: background-color 0.25s ease, box-shadow 0.25s ease, transform 0.2s ease;
            white-space: nowrap;
        }
        .cta-subscribe .form-btn:hover,
        .cta-subscribe .form-btn:focus {
            background: #FF6A4D;
            box-shadow: 0 0 18px var(--shadow-glow);
            transform: translateY(-2px);
        }

        /* 页脚 */
        .site-footer {
            background-color: #0A0A0B;
            border-top: 1px solid var(--border-subtle);
            padding-top: 56px;
            padding-bottom: 28px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
            gap: 28px;
            margin-bottom: 36px;
        }
        .footer-brand-name {
            font-size: 1.25rem;
            font-weight: 800;
            color: var(--text-primary);
            margin-bottom: 10px;
            letter-spacing: 0.02em;
        }
        .footer-brand-text {
            font-size: 0.85rem;
            color: var(--text-secondary);
            line-height: 1.7;
            max-width: 260px;
            margin-bottom: 0;
        }
        .footer-col-title {
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 12px;
            letter-spacing: 0.03em;
        }
        .footer-col-link {
            display: block;
            font-size: 0.85rem;
            color: var(--text-secondary);
            padding: 4px 0;
            transition: color 0.2s ease, padding-left 0.2s ease;
        }
        .footer-col-link:hover,
        .footer-col-link:focus {
            color: var(--accent-gold);
            padding-left: 4px;
        }
        .footer-bottom {
            border-top: 1px solid var(--border-subtle);
            padding-top: 20px;
            text-align: center;
        }
        .footer-copyright {
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        /* 响应式断点 */
        @media (max-width: 992px) {
            :root {
                --spacing-section: 64px;
            }
            .header-inner {
                flex-wrap: wrap;
                gap: 12px;
            }
            .nav-chip-bar {
                order: 3;
                width: 100%;
                justify-content: flex-start;
                overflow-x: auto;
                flex-wrap: nowrap;
                -webkit-overflow-scrolling: touch;
                padding-bottom: 4px;
            }
            .nav-chip {
                flex-shrink: 0;
            }
            .category-banner .banner-title {
                font-size: 1.8rem;
            }
            .section-title {
                font-size: 1.6rem;
            }
        }
        @media (max-width: 768px) {
            :root {
                --spacing-section: 48px;
            }
            .logo-brand {
                font-size: 1.2rem;
            }
            .header-cta {
                padding: 8px 16px;
                font-size: 0.82rem;
            }
            .category-banner {
                padding: 36px 0 32px;
            }
            .category-banner .banner-title {
                font-size: 1.5rem;
            }
            .category-banner .banner-subtitle {
                font-size: 0.92rem;
            }
            .section-title {
                font-size: 1.4rem;
            }
            .cta-subscribe {
                padding: 32px 22px;
            }
            .cta-subscribe .form-row-inline {
                flex-direction: column;
            }
            .cta-subscribe .form-input {
                min-width: 100%;
            }
        }
        @media (max-width: 576px) {
            .article-list-card .card-cover {
                aspect-ratio: 16 / 10;
            }
            .article-list-card .card-body {
                padding: 18px 16px;
            }
            .article-list-card .card-title {
                font-size: 1rem;
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
            .roadmap-card {
                padding: 22px 18px;
            }
            .data-brief-card .data-value {
                font-size: 1.8rem;
            }
        }

/* roulang: framework shim */
/* 覆盖 Bootstrap 等对 a/btn 的全局默认，避免导航出现下划线/蓝链 */
.site-header a,.site-header a:hover,.navbar a,.navbar a:hover,.nav-links a,.nav-links a:hover,header nav a,header nav a:hover{text-decoration:none}
.site-header .btn,.navbar .btn,.nav-cta{text-decoration:none}