/* roulang page: index */
:root {
            --pitch: #1A2E1A;
            --carbon: #0E0E0E;
            --volt: #D4FF3F;
            --paper: #F4F1EA;
            --mist: #E9E5DB;
            --ink: #111111;
            --body: #3B3B3B;
            --muted: #6A6A6A;
            --border-light: rgba(0,0,0,0.08);
            --border-volt: rgba(212,255,63,0.4);
            --radius-card: 14px;
            --radius-btn: 10px;
            --radius-chip: 999px;
            --shadow-card: 0 2px 12px rgba(0,0,0,0.04);
            --shadow-card-hover: 0 8px 28px rgba(0,0,0,0.08);
            --transition: 0.25s ease;
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: '"Noto Sans SC"', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            font-size: 16px;
            line-height: 1.65;
            color: var(--body);
            background-color: var(--paper);
            overflow-x: hidden;
        }

        .font-display {
            font-weight: 800;
            letter-spacing: -0.02em;
            color: var(--ink);
        }

        .font-num {
            font-family: 'Inter', 'SF Mono', 'Roboto Mono', monospace;
            font-weight: 700;
            letter-spacing: -0.01em;
        }

        .container-site {
            max-width: 1200px;
            margin: 0 auto;
            padding-left: 32px;
            padding-right: 32px;
        }

        /* Navigation */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 50;
            background: rgba(244,241,234,0.92);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-light);
            transition: box-shadow 0.3s ease;
        }

        .site-header.scrolled {
            box-shadow: 0 4px 20px rgba(0,0,0,0.06);
        }

        .nav-link {
            position: relative;
            font-size: 15px;
            font-weight: 500;
            color: var(--body);
            padding: 8px 14px;
            border-radius: 8px;
            transition: color 0.25s ease, background 0.25s ease;
            white-space: nowrap;
        }

        .nav-link:hover {
            color: var(--ink);
            background: rgba(0,0,0,0.04);
        }

        .nav-link.active {
            color: var(--pitch);
            font-weight: 700;
        }

        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 14px;
            right: 14px;
            height: 2px;
            background: var(--volt);
            border-radius: 2px;
        }

        /* Steps bar */
        .steps-bar {
            display: flex;
            align-items: center;
            gap: 0;
            overflow-x: auto;
            scroll-snap-type: x mandatory;
            -webkit-overflow-scrolling: touch;
            padding: 10px 0;
            max-width: 1200px;
            margin: 0 auto;
            scrollbar-width: none;
        }

        .steps-bar::-webkit-scrollbar {
            display: none;
        }

        .step-node {
            display: flex;
            align-items: center;
            flex-shrink: 0;
            cursor: pointer;
            scroll-snap-align: start;
            transition: transform 0.25s ease;
            user-select: none;
            text-decoration: none;
        }

        .step-node:hover {
            transform: scale(1.02);
        }

        .step-dot {
            width: 28px;
            height: 28px;
            border-radius: 50%;
            border: 2px solid var(--border-light);
            background: var(--paper);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 11px;
            font-weight: 700;
            color: var(--muted);
            transition: all 0.25s ease;
            flex-shrink: 0;
        }

        .step-node:hover .step-dot {
            border-color: var(--volt);
            background: var(--volt);
            color: var(--pitch);
        }

        .step-label {
            font-size: 13px;
            font-weight: 600;
            color: var(--body);
            margin-left: 10px;
            white-space: nowrap;
        }

        .step-separator {
            width: 36px;
            height: 1px;
            background: var(--border-light);
            margin: 0 12px;
            flex-shrink: 0;
        }

        /* Hero */
        .hero-section {
            position: relative;
            min-height: 92vh;
            display: flex;
            align-items: center;
            overflow: hidden;
        }

        .hero-bg {
            position: absolute;
            inset: 0;
            background-size: cover;
            background-position: center;
            opacity: 0.15;
            z-index: 0;
        }

        .hero-content {
            position: relative;
            z-index: 1;
            width: 100%;
        }

        .score-display {
            background: var(--carbon);
            border-radius: 18px;
            padding: 28px 32px;
            border: 1px solid rgba(255,255,255,0.06);
            box-shadow: 0 20px 50px rgba(0,0,0,0.2);
        }

        .score-display .team-name {
            font-size: 14px;
            font-weight: 600;
            color: rgba(255,255,255,0.6);
            text-transform: uppercase;
            letter-spacing: 0.08em;
        }

        .score-display .score-num {
            font-size: 56px;
            font-weight: 800;
            color: var(--volt);
            line-height: 1;
            font-family: 'Inter', 'SF Mono', monospace;
        }

        .score-display .timer {
            font-size: 20px;
            font-weight: 700;
            color: rgba(255,255,255,0.9);
            font-family: 'Inter', 'SF Mono', monospace;
            letter-spacing: 0.04em;
        }

        /* Cards */
        .card-base {
            background: #fff;
            border-radius: var(--radius-card);
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-card);
            transition: all var(--transition);
            overflow: hidden;
        }

        .card-base:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-card-hover);
            border-color: var(--border-volt);
        }

        .card-img-wrap {
            position: relative;
            overflow: hidden;
            aspect-ratio: 16 / 9;
            background: var(--mist);
        }

        .card-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.35s ease;
        }

        .card-base:hover .card-img-wrap img {
            transform: scale(1.03);
        }

        .card-body {
            padding: 22px 26px;
        }

        .chip {
            display: inline-flex;
            align-items: center;
            padding: 6px 16px;
            border-radius: var(--radius-chip);
            font-size: 13px;
            font-weight: 600;
            line-height: 1.4;
            transition: all 0.25s ease;
            cursor: pointer;
            white-space: nowrap;
            text-decoration: none;
        }

        .chip-light {
            background: #fff;
            border: 1px solid var(--border-light);
            color: var(--body);
        }

        .chip-light:hover {
            border-color: var(--volt);
            color: var(--pitch);
            background: rgba(212,255,63,0.1);
        }

        /* Buttons */
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 30px;
            background: var(--pitch);
            color: #fff;
            font-weight: 700;
            font-size: 15px;
            border-radius: var(--radius-btn);
            border: none;
            cursor: pointer;
            transition: all 0.25s ease;
            text-decoration: none;
            line-height: 1.4;
        }

        .btn-primary:hover {
            background: var(--volt);
            color: var(--pitch);
            transform: translateY(-2px);
        }

        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 30px;
            background: transparent;
            color: var(--ink);
            font-weight: 700;
            font-size: 15px;
            border-radius: var(--radius-btn);
            border: 2px solid var(--border-light);
            cursor: pointer;
            transition: all 0.25s ease;
            text-decoration: none;
            line-height: 1.4;
        }

        .btn-secondary:hover {
            border-color: var(--volt);
            background: rgba(212,255,63,0.06);
            color: var(--pitch);
        }

        .btn-ghost {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            color: var(--body);
            font-weight: 600;
            font-size: 15px;
            text-decoration: none;
            padding: 4px 0;
            border-bottom: 2px solid transparent;
            transition: all 0.25s ease;
            cursor: pointer;
        }

        .btn-ghost:hover {
            color: var(--pitch);
            border-bottom-color: var(--volt);
        }

        /* Section */
        .section-pad {
            padding-top: 80px;
            padding-bottom: 80px;
        }

        .section-alt {
            background: #fff;
        }

        .section-mist {
            background: var(--mist);
        }

        .section-pitch {
            background: var(--pitch);
            color: rgba(255,255,255,0.85);
        }

        .section-title {
            font-size: 34px;
            font-weight: 800;
            letter-spacing: -0.02em;
            color: var(--ink);
            line-height: 1.25;
            margin-bottom: 14px;
        }

        .section-sub {
            font-size: 17px;
            color: var(--muted);
            line-height: 1.7;
            max-width: 680px;
            margin-bottom: 36px;
        }

        .section-pitch .section-title {
            color: #fff;
        }

        .section-pitch .section-sub {
            color: rgba(255,255,255,0.7);
        }

        /* FAQ */
        .faq-item {
            border-bottom: 1px solid var(--border-light);
            transition: all 0.25s ease;
        }

        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 20px 0;
            cursor: pointer;
            font-weight: 700;
            font-size: 16px;
            color: var(--ink);
            transition: color 0.25s ease;
            user-select: none;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
        }

        .faq-question:hover {
            color: var(--pitch);
        }

        .faq-question .faq-icon {
            transition: transform 0.3s ease;
            color: var(--muted);
            flex-shrink: 0;
            margin-left: 16px;
        }

        .faq-item.open .faq-icon {
            transform: rotate(45deg);
            color: var(--pitch);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            color: var(--body);
            font-size: 15px;
            line-height: 1.7;
            padding: 0;
        }

        .faq-item.open .faq-answer {
            max-height: 300px;
            padding-bottom: 20px;
        }

        /* Form */
        .form-input {
            width: 100%;
            padding: 12px 16px;
            height: 44px;
            border: 1px solid var(--border-light);
            border-radius: 8px;
            font-size: 15px;
            color: var(--ink);
            background: #fff;
            transition: all 0.25s ease;
            outline: none;
        }

        .form-input:focus {
            border-color: var(--volt);
            box-shadow: 0 0 0 3px rgba(212,255,63,0.2);
        }

        .form-label {
            display: block;
            font-size: 14px;
            font-weight: 600;
            color: var(--ink);
            margin-bottom: 6px;
            text-align: left;
        }

        /* Footer */
        .site-footer {
            background: var(--carbon);
            color: rgba(255,255,255,0.7);
            padding-top: 60px;
            padding-bottom: 32px;
        }

        .footer-link {
            color: rgba(255,255,255,0.6);
            text-decoration: none;
            font-size: 14px;
            transition: color 0.25s ease;
            display: inline-block;
            padding: 4px 0;
        }

        .footer-link:hover {
            color: var(--volt);
        }

        /* Mobile nav */
        .mobile-menu {
            display: none;
        }

        .mobile-menu.open {
            display: block;
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .container-site {
                padding-left: 24px;
                padding-right: 24px;
            }
            .section-pad {
                padding-top: 64px;
                padding-bottom: 64px;
            }
            .section-title {
                font-size: 28px;
            }
        }

        @media (max-width: 768px) {
            .desktop-nav {
                display: none;
            }
            .hamburger-btn {
                display: inline-flex;
            }
            .section-pad {
                padding-top: 48px;
                padding-bottom: 48px;
            }
            .section-title {
                font-size: 24px;
            }
            .hero-section {
                min-height: auto;
                padding-top: 60px;
                padding-bottom: 60px;
            }
            .score-display .score-num {
                font-size: 40px;
            }
            .steps-bar {
                height: auto;
                min-height: 44px;
                max-height: 48px;
            }
        }

        @media (max-width: 520px) {
            .container-site {
                padding-left: 18px;
                padding-right: 18px;
            }
            .section-title {
                font-size: 22px;
            }
            .btn-primary, .btn-secondary {
                padding: 12px 22px;
                font-size: 14px;
            }
            .score-display {
                padding: 20px 24px;
            }
            .score-display .score-num {
                font-size: 34px;
            }
        }

        .hamburger-btn {
            display: none;
            align-items: center;
            justify-content: center;
            width: 44px;
            height: 44px;
            border: 1px solid var(--border-light);
            border-radius: 10px;
            background: #fff;
            cursor: pointer;
            font-size: 20px;
            color: var(--ink);
            transition: all 0.25s ease;
        }

        .hamburger-btn:hover {
            border-color: var(--volt);
            background: rgba(212,255,63,0.06);
        }

        @media (max-width: 768px) {
            .desktop-nav {
                display: none !important;
            }
            .hamburger-btn {
                display: inline-flex;
            }
        }

        @media (min-width: 769px) {
            .mobile-menu {
                display: none !important;
            }
        }

        /* Image alt styling */
        .img-fallback {
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 13px;
            color: var(--muted);
            font-weight: 600;
            background: var(--mist);
            text-align: center;
            padding: 12px;
            min-height: 100%;
        }

        /* Custom scrollbar for steps on mobile */
        .steps-bar {
            scrollbar-width: none;
        }

        .steps-bar::-webkit-scrollbar {
            display: none;
        }

        /* Section divider subtle */
        .section-divider {
            height: 1px;
            background: var(--border-light);
            max-width: 1200px;
            margin: 0 auto;
        }

/* roulang page: category2 */
:root {
            --pitch: #1A2E1A;
            --carbon: #0E0E0E;
            --volt: #D4FF3F;
            --paper: #F4F1EA;
            --mist: #E9E5DB;
            --ink: #111111;
            --body: #3B3B3B;
            --muted: #6A6A6A;
            --border-light: rgba(0, 0, 0, 0.08);
            --border-volt: rgba(212, 255, 63, 0.4);
            --radius-card: 14px;
            --radius-btn: 10px;
            --radius-chip: 999px;
            --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.04);
            --shadow-card-hover: 0 8px 28px rgba(0, 0, 0, 0.08);
            --transition: 0.25s ease;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            font-size: 16px;
            line-height: 1.65;
            color: var(--body);
            background-color: var(--paper);
            overflow-x: hidden;
        }

        .container-site {
            max-width: 1200px;
            margin: 0 auto;
            padding-left: 32px;
            padding-right: 32px;
        }

        .site-header {
            position: sticky;
            top: 0;
            z-index: 50;
            background: rgba(244, 241, 234, 0.92);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-light);
            transition: box-shadow 0.3s ease;
        }

        .site-header.scrolled {
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
        }

        .nav-link {
            position: relative;
            font-size: 15px;
            font-weight: 500;
            color: var(--body);
            padding: 8px 14px;
            border-radius: 8px;
            transition: color 0.25s ease, background 0.25s ease;
            white-space: nowrap;
            text-decoration: none;
        }

        .nav-link:hover {
            color: var(--ink);
            background: rgba(0, 0, 0, 0.04);
        }

        .nav-link.active {
            color: var(--pitch);
            font-weight: 700;
        }

        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 14px;
            right: 14px;
            height: 2px;
            background: var(--volt);
            border-radius: 2px;
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 30px;
            background: var(--pitch);
            color: #fff;
            font-weight: 700;
            font-size: 15px;
            border-radius: var(--radius-btn);
            border: none;
            cursor: pointer;
            transition: all 0.25s ease;
            text-decoration: none;
            line-height: 1.4;
        }

        .btn-primary:hover {
            background: var(--volt);
            color: var(--pitch);
            transform: translateY(-2px);
        }

        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 30px;
            background: transparent;
            color: var(--ink);
            font-weight: 700;
            font-size: 15px;
            border-radius: var(--radius-btn);
            border: 2px solid var(--border-light);
            cursor: pointer;
            transition: all 0.25s ease;
            text-decoration: none;
            line-height: 1.4;
        }

        .btn-secondary:hover {
            border-color: var(--volt);
            background: rgba(212, 255, 63, 0.06);
            color: var(--pitch);
        }

        .btn-ghost {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            color: var(--body);
            font-weight: 600;
            font-size: 15px;
            text-decoration: none;
            padding: 4px 0;
            border-bottom: 2px solid transparent;
            transition: all 0.25s ease;
            cursor: pointer;
        }

        .btn-ghost:hover {
            color: var(--pitch);
            border-bottom-color: var(--volt);
        }

        .card-base {
            background: #fff;
            border-radius: var(--radius-card);
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-card);
            transition: all var(--transition);
            overflow: hidden;
            text-decoration: none;
            color: inherit;
            display: block;
        }

        .card-base:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-card-hover);
            border-color: var(--border-volt);
        }

        .card-img-wrap {
            position: relative;
            overflow: hidden;
            aspect-ratio: 16 / 9;
            background: var(--mist);
        }

        .card-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.35s ease;
        }

        .card-base:hover .card-img-wrap img {
            transform: scale(1.03);
        }

        .card-body {
            padding: 22px 26px;
        }

        .chip {
            display: inline-flex;
            align-items: center;
            padding: 6px 16px;
            border-radius: var(--radius-chip);
            font-size: 13px;
            font-weight: 600;
            line-height: 1.4;
            transition: all 0.25s ease;
            cursor: pointer;
            white-space: nowrap;
            text-decoration: none;
        }

        .chip-light {
            background: #fff;
            border: 1px solid var(--border-light);
            color: var(--body);
        }

        .chip-light:hover {
            border-color: var(--volt);
            color: var(--pitch);
            background: rgba(212, 255, 63, 0.1);
        }

        .page-banner {
            background: linear-gradient(135deg, rgba(26, 46, 26, 0.05), rgba(26, 46, 26, 0.12));
            border-bottom: 1px solid var(--border-light);
            padding: 48px 0 40px;
        }

        .breadcrumb {
            font-size: 13px;
            color: var(--muted);
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .breadcrumb a {
            color: var(--muted);
            text-decoration: none;
            transition: color 0.25s ease;
        }

        .breadcrumb a:hover {
            color: var(--pitch);
        }

        .section-title {
            font-size: 32px;
            font-weight: 800;
            letter-spacing: -0.02em;
            color: var(--ink);
            margin-bottom: 16px;
            line-height: 1.3;
        }

        .section-sub {
            font-size: 16px;
            color: var(--muted);
            line-height: 1.7;
            max-width: 640px;
        }

        .stat-block {
            background: var(--pitch);
            border-radius: var(--radius-card);
            padding: 28px 24px;
            color: #fff;
            text-align: center;
        }

        .stat-number {
            font-family: 'Inter', 'SF Mono', 'Roboto Mono', monospace;
            font-size: 42px;
            font-weight: 800;
            color: var(--volt);
            letter-spacing: -0.02em;
            line-height: 1.1;
        }

        .stat-label {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.7);
            margin-top: 8px;
        }

        .info-block {
            background: #fff;
            border: 1px solid var(--border-light);
            border-radius: var(--radius-card);
            padding: 22px 24px;
            transition: all var(--transition);
        }

        .info-block:hover {
            border-color: var(--border-volt);
            box-shadow: var(--shadow-card);
        }

        .faq-item {
            border-bottom: 1px solid var(--border-light);
            padding: 18px 0;
        }

        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            font-weight: 700;
            color: var(--ink);
            font-size: 16px;
            gap: 16px;
            transition: color 0.25s ease;
        }

        .faq-question:hover {
            color: var(--pitch);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease;
            color: var(--body);
            font-size: 15px;
            line-height: 1.7;
        }

        .faq-item.open .faq-answer {
            max-height: 200px;
            padding-top: 12px;
        }

        .faq-icon {
            transition: transform 0.3s ease;
            flex-shrink: 0;
            color: var(--muted);
        }

        .faq-item.open .faq-icon {
            transform: rotate(45deg);
            color: var(--pitch);
        }

        .cta-section {
            background: var(--pitch);
            border-radius: 20px;
            padding: 48px 40px;
            color: #fff;
        }

        .footer-link {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.55);
            text-decoration: none;
            transition: color 0.25s ease;
            display: inline-block;
            padding: 2px 0;
        }

        .footer-link:hover {
            color: var(--volt);
        }

        .site-footer {
            background: var(--pitch);
            padding: 56px 0 32px;
            margin-top: 80px;
        }

        .hamburger-btn {
            display: none;
            background: none;
            border: 1px solid var(--border-light);
            border-radius: 8px;
            padding: 8px 12px;
            cursor: pointer;
            font-size: 18px;
            color: var(--ink);
            transition: all 0.25s ease;
        }

        .hamburger-btn:hover {
            background: rgba(0, 0, 0, 0.04);
            border-color: var(--volt);
        }

        .mobile-menu {
            display: none;
        }

        .mobile-menu.open {
            display: block;
        }

        @media (max-width: 1024px) {
            .desktop-nav {
                display: none;
            }

            .hamburger-btn {
                display: inline-flex;
                align-items: center;
                justify-content: center;
            }

            .mobile-menu {
                display: none;
                padding-top: 8px;
            }

            .mobile-menu.open {
                display: block;
            }

            .container-site {
                padding-left: 24px;
                padding-right: 24px;
            }
        }

        @media (max-width: 768px) {
            .section-title {
                font-size: 26px;
            }

            .stat-number {
                font-size: 32px;
            }

            .container-site {
                padding-left: 20px;
                padding-right: 20px;
            }

            .page-banner {
                padding: 32px 0 28px;
            }
        }

        @media (max-width: 520px) {
            .section-title {
                font-size: 22px;
            }

            .stat-number {
                font-size: 28px;
            }

            .btn-primary,
            .btn-secondary {
                padding: 12px 22px;
                font-size: 14px;
            }

            .card-body {
                padding: 16px 18px;
            }
        }

        .tag-dot {
            display: inline-block;
            width: 6px;
            height: 6px;
            border-radius: 50%;
            background: var(--volt);
            margin-right: 6px;
            vertical-align: middle;
        }

        .divider {
            height: 1px;
            background: var(--border-light);
            margin: 24px 0;
        }

        .bg-mist {
            background: var(--mist);
        }

        .text-pitch {
            color: var(--pitch);
        }

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

        .font-mono-num {
            font-family: 'Inter', 'SF Mono', 'Roboto Mono', monospace;
        }

/* roulang page: category1 */
/* ========== 设计系统变量 ========== */
        :root {
            --pitch: #1A2E1A;
            --carbon: #0E0E0E;
            --volt: #D4FF3F;
            --paper: #F4F1EA;
            --mist: #E9E5DB;
            --ink: #111111;
            --body: #3B3B3B;
            --muted: #6A6A6A;
            --border-light: rgba(0,0,0,0.08);
            --border-volt: rgba(212,255,63,0.4);
            --radius-card: 14px;
            --radius-btn: 10px;
            --radius-chip: 999px;
            --shadow-card: 0 2px 12px rgba(0,0,0,0.04);
            --shadow-card-hover: 0 8px 28px rgba(0,0,0,0.08);
            --transition: 0.25s ease;
        }
        
        /* ========== 基础 Reset/Base ========== */
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            font-size: 16px;
            line-height: 1.65;
            color: var(--body);
            background-color: var(--paper);
            overflow-x: hidden;
            margin: 0;
            padding: 0;
        }
        img {
            max-width: 100%;
            display: block;
        }
        a {
            text-decoration: none;
            color: inherit;
        }
        button, input, textarea, select {
            font-family: inherit;
            font-size: inherit;
        }
        button:focus-visible, a:focus-visible, input:focus-visible, textarea:focus-visible {
            outline: 2px solid var(--volt);
            outline-offset: 2px;
        }
        * {
            box-sizing: border-box;
        }
        
        /* ========== 容器 ========== */
        .container-site {
            max-width: 1200px;
            margin: 0 auto;
            padding-left: 32px;
            padding-right: 32px;
        }
        @media (max-width: 768px) {
            .container-site {
                padding-left: 24px;
                padding-right: 24px;
            }
        }
        
        /* ========== 导航 ========== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 50;
            background: rgba(244,241,234,0.92);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-light);
            transition: box-shadow 0.3s ease;
        }
        .site-header.scrolled {
            box-shadow: 0 4px 20px rgba(0,0,0,0.06);
        }
        .nav-link {
            position: relative;
            font-size: 15px;
            font-weight: 500;
            color: var(--body);
            padding: 8px 14px;
            border-radius: 8px;
            transition: color 0.25s ease, background 0.25s ease;
            white-space: nowrap;
            text-decoration: none;
            display: inline-flex;
            align-items: center;
        }
        .nav-link:hover {
            color: var(--ink);
            background: rgba(0,0,0,0.04);
        }
        .nav-link.active {
            color: var(--pitch);
            font-weight: 700;
        }
        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 14px;
            right: 14px;
            height: 2px;
            background: var(--volt);
            border-radius: 2px;
        }
        .desktop-nav {
            display: flex;
            align-items: center;
            gap: 1.5px;
            flex-wrap: nowrap;
        }
        @media (max-width: 1024px) {
            .desktop-nav {
                display: none;
            }
        }
        .hamburger-btn {
            display: none;
            background: transparent;
            border: 1px solid var(--border-light);
            border-radius: 8px;
            padding: 8px 12px;
            font-size: 18px;
            color: var(--ink);
            cursor: pointer;
            transition: all 0.25s ease;
            align-items: center;
            justify-content: center;
        }
        .hamburger-btn:hover {
            border-color: var(--volt);
            background: rgba(212,255,63,0.08);
        }
        @media (max-width: 1024px) {
            .hamburger-btn {
                display: inline-flex;
            }
        }
        .mobile-menu {
            transition: all 0.3s ease;
        }
        .mobile-menu.hidden {
            display: none;
        }
        
        /* ========== 按钮 ========== */
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 30px;
            background: var(--pitch);
            color: #fff;
            font-weight: 700;
            font-size: 15px;
            border-radius: var(--radius-btn);
            border: none;
            cursor: pointer;
            transition: all 0.25s ease;
            text-decoration: none;
            line-height: 1.4;
        }
        .btn-primary:hover {
            background: var(--volt);
            color: var(--pitch);
            transform: translateY(-2px);
        }
        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 30px;
            background: transparent;
            color: var(--ink);
            font-weight: 700;
            font-size: 15px;
            border-radius: var(--radius-btn);
            border: 2px solid var(--border-light);
            cursor: pointer;
            transition: all 0.25s ease;
            text-decoration: none;
            line-height: 1.4;
        }
        .btn-secondary:hover {
            border-color: var(--volt);
            background: rgba(212,255,63,0.06);
            color: var(--pitch);
        }
        .btn-ghost {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            color: var(--body);
            font-weight: 600;
            font-size: 15px;
            text-decoration: none;
            padding: 4px 0;
            border-bottom: 2px solid transparent;
            transition: all 0.25s ease;
            cursor: pointer;
            background: transparent;
            border-top: none;
            border-left: none;
            border-right: none;
        }
        .btn-ghost:hover {
            color: var(--pitch);
            border-bottom-color: var(--volt);
        }
        
        /* ========== 卡片 ========== */
        .card-base {
            background: #fff;
            border-radius: var(--radius-card);
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-card);
            transition: all var(--transition);
            overflow: hidden;
            display: flex;
            flex-direction: column;
            height: 100%;
        }
        .card-base:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-card-hover);
            border-color: var(--border-volt);
        }
        .card-img-wrap {
            position: relative;
            overflow: hidden;
            aspect-ratio: 16 / 9;
            background: var(--mist);
            flex-shrink: 0;
        }
        .card-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.35s ease;
        }
        .card-base:hover .card-img-wrap img {
            transform: scale(1.03);
        }
        .card-body {
            padding: 22px 26px;
            flex: 1;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .card-body .card-title {
            font-size: 19px;
            font-weight: 700;
            color: var(--ink);
            line-height: 1.4;
            margin: 0;
        }
        .card-body .card-summary {
            font-size: 15px;
            color: var(--muted);
            line-height: 1.6;
            margin: 0;
            flex: 1;
        }
        .card-body .card-tag {
            font-size: 13px;
            font-weight: 600;
            color: var(--pitch);
            background: rgba(26,46,26,0.06);
            padding: 4px 14px;
            border-radius: 999px;
            display: inline-flex;
            align-items: center;
            width: fit-content;
        }
        .card-arrow {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 14px;
            font-weight: 600;
            color: var(--pitch);
            transition: all 0.25s ease;
            text-decoration: none;
            margin-top: auto;
        }
        .card-arrow:hover {
            color: var(--ink);
            gap: 10px;
        }
        .card-arrow i {
            font-size: 13px;
            transition: transform 0.25s ease;
        }
        .card-arrow:hover i {
            transform: translateX(3px);
        }
        
        /* ========== Chip 标签 ========== */
        .chip {
            display: inline-flex;
            align-items: center;
            padding: 6px 16px;
            border-radius: var(--radius-chip);
            font-size: 13px;
            font-weight: 600;
            line-height: 1.4;
            transition: all 0.25s ease;
            cursor: pointer;
            white-space: nowrap;
            text-decoration: none;
            gap: 6px;
        }
        .chip-light {
            background: #fff;
            border: 1px solid var(--border-light);
            color: var(--body);
        }
        .chip-light:hover {
            border-color: var(--volt);
            color: var(--pitch);
            background: rgba(212,255,63,0.1);
        }
        .chip-dark {
            background: var(--pitch);
            border: 1px solid var(--pitch);
            color: #fff;
        }
        .chip-dark:hover {
            background: var(--volt);
            border-color: var(--volt);
            color: var(--pitch);
        }
        .chip-outline-volt {
            background: transparent;
            border: 1px solid var(--border-volt);
            color: var(--pitch);
        }
        .chip-outline-volt:hover {
            background: var(--volt);
            border-color: var(--volt);
            color: var(--pitch);
        }
        
        /* ========== 分类页横幅 ========== */
        .cat-banner {
            background: var(--mist);
            border-bottom: 1px solid var(--border-light);
            padding: 40px 0 36px;
        }
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--muted);
            margin-bottom: 12px;
            flex-wrap: wrap;
        }
        .breadcrumb a {
            color: var(--muted);
            text-decoration: none;
            transition: color 0.25s ease;
        }
        .breadcrumb a:hover {
            color: var(--pitch);
        }
        .breadcrumb .sep {
            color: rgba(0,0,0,0.25);
            font-size: 12px;
        }
        .breadcrumb .current {
            color: var(--pitch);
            font-weight: 600;
        }
        
        /* ========== 分类说明区 ========== */
        .cat-intro {
            padding: 48px 0 40px;
            background: var(--paper);
        }
        .cat-intro-text {
            max-width: 780px;
        }
        .cat-intro-text h2 {
            font-size: 30px;
            font-weight: 800;
            color: var(--ink);
            letter-spacing: -0.02em;
            margin: 0 0 16px;
            line-height: 1.3;
        }
        @media (max-width: 640px) {
            .cat-intro-text h2 {
                font-size: 24px;
            }
        }
        .cat-intro-text p {
            font-size: 16px;
            color: var(--body);
            line-height: 1.75;
            margin: 0;
        }
        
        /* ========== 卡片网格 ========== */
        .cards-section {
            padding: 32px 0 64px;
            background: #fff;
            border-top: 1px solid var(--border-light);
            border-bottom: 1px solid var(--border-light);
        }
        .cards-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        @media (max-width: 1024px) {
            .cards-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 24px;
            }
        }
        @media (max-width: 640px) {
            .cards-grid {
                grid-template-columns: 1fr;
                gap: 18px;
            }
        }
        .section-heading {
            margin-bottom: 32px;
        }
        .section-heading h2 {
            font-size: 32px;
            font-weight: 800;
            color: var(--ink);
            letter-spacing: -0.02em;
            margin: 0 0 10px;
            line-height: 1.3;
        }
        @media (max-width: 640px) {
            .section-heading h2 {
                font-size: 26px;
            }
        }
        .section-heading .subtitle {
            font-size: 16px;
            color: var(--muted);
            margin: 0;
            max-width: 620px;
        }
        
        /* ========== 场景提示区 ========== */
        .scene-tips {
            padding: 64px 0;
            background: var(--paper);
        }
        .tips-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        @media (max-width: 768px) {
            .tips-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
        }
        .tip-item {
            background: #fff;
            border-radius: var(--radius-card);
            border: 1px solid var(--border-light);
            padding: 24px 26px;
            box-shadow: var(--shadow-card);
            transition: all 0.25s ease;
        }
        .tip-item:hover {
            border-color: var(--border-volt);
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-2px);
        }
        .tip-icon {
            width: 40px;
            height: 40px;
            border-radius: 10px;
            background: rgba(26,46,26,0.06);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 14px;
            font-size: 18px;
            color: var(--pitch);
        }
        .tip-item h3 {
            font-size: 17px;
            font-weight: 700;
            color: var(--ink);
            margin: 0 0 8px;
        }
        .tip-item p {
            font-size: 14px;
            color: var(--muted);
            margin: 0;
            line-height: 1.6;
        }
        
        /* ========== 数据面板 ========== */
        .data-panel-section {
            padding: 64px 0;
            background: var(--pitch);
        }
        .data-panel-section .section-heading h2 {
            color: #fff;
        }
        .data-panel-section .section-heading .subtitle {
            color: rgba(255,255,255,0.6);
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        @media (max-width: 1024px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
        }
        @media (max-width: 640px) {
            .stats-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
        }
        .stat-card {
            background: rgba(255,255,255,0.05);
            border: 1px solid rgba(255,255,255,0.1);
            border-radius: var(--radius-card);
            padding: 28px 24px;
            text-align: center;
            transition: all 0.25s ease;
        }
        .stat-card:hover {
            background: rgba(212,255,63,0.06);
            border-color: var(--border-volt);
        }
        .stat-number {
            font-size: 52px;
            font-weight: 800;
            color: var(--volt);
            line-height: 1.1;
            letter-spacing: -0.02em;
            font-family: 'SF Mono', 'Roboto Mono', 'Inter', monospace;
        }
        @media (max-width: 640px) {
            .stat-number {
                font-size: 40px;
            }
        }
        .stat-label {
            font-size: 15px;
            color: rgba(255,255,255,0.75);
            margin-top: 8px;
            font-weight: 500;
        }
        
        /* ========== FAQ ========== */
        .faq-section {
            padding: 64px 0;
            background: #fff;
            border-top: 1px solid var(--border-light);
        }
        .faq-list {
            max-width: 760px;
            margin: 0 auto;
        }
        .faq-item {
            border-bottom: 1px solid var(--border-light);
            transition: all 0.25s ease;
        }
        .faq-item:hover {
            border-bottom-color: var(--border-volt);
        }
        .faq-question {
            width: 100%;
            background: transparent;
            border: none;
            padding: 18px 0;
            display: flex;
            align-items: center;
            justify-content: space-between;
            cursor: pointer;
            text-align: left;
            font-size: 16px;
            font-weight: 600;
            color: var(--ink);
            transition: color 0.25s ease;
            gap: 16px;
        }
        .faq-question:hover {
            color: var(--pitch);
        }
        .faq-question .faq-icon {
            font-size: 14px;
            color: var(--muted);
            transition: transform 0.3s ease, color 0.25s ease;
            flex-shrink: 0;
        }
        .faq-item.open .faq-question .faq-icon {
            transform: rotate(45deg);
            color: var(--pitch);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.3s ease;
            font-size: 15px;
            color: var(--body);
            line-height: 1.7;
        }
        .faq-item.open .faq-answer {
            max-height: 200px;
            padding: 0 0 20px;
        }
        
        /* ========== CTA / 延伸导读 ========== */
        .cta-simple {
            padding: 64px 0 80px;
            background: var(--paper);
        }
        .cta-simple-inner {
            background: var(--pitch);
            border-radius: var(--radius-card);
            padding: 48px 40px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 32px;
            flex-wrap: wrap;
        }
        @media (max-width: 768px) {
            .cta-simple-inner {
                padding: 32px 24px;
                flex-direction: column;
                text-align: center;
            }
        }
        .cta-simple-text h2 {
            font-size: 28px;
            font-weight: 800;
            color: #fff;
            margin: 0 0 10px;
            letter-spacing: -0.02em;
        }
        .cta-simple-text p {
            font-size: 16px;
            color: rgba(255,255,255,0.65);
            margin: 0;
            max-width: 480px;
        }
        .cta-simple-actions {
            display: flex;
            gap: 14px;
            flex-shrink: 0;
            flex-wrap: wrap;
        }
        .btn-primary-volt {
            background: var(--volt);
            color: var(--pitch);
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 30px;
            font-weight: 700;
            font-size: 15px;
            border-radius: var(--radius-btn);
            border: none;
            cursor: pointer;
            transition: all 0.25s ease;
            text-decoration: none;
            line-height: 1.4;
        }
        .btn-primary-volt:hover {
            background: #fff;
            color: var(--pitch);
            transform: translateY(-2px);
        }
        .btn-outline-light {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 30px;
            background: transparent;
            color: #fff;
            font-weight: 700;
            font-size: 15px;
            border-radius: var(--radius-btn);
            border: 2px solid rgba(255,255,255,0.3);
            cursor: pointer;
            transition: all 0.25s ease;
            text-decoration: none;
            line-height: 1.4;
        }
        .btn-outline-light:hover {
            border-color: var(--volt);
            color: var(--volt);
            background: rgba(212,255,63,0.05);
        }
        
        /* ========== 页脚 ========== */
        .site-footer {
            background: var(--pitch);
            padding: 56px 0 32px;
            color: rgba(255,255,255,0.7);
        }
        .footer-link {
            display: block;
            font-size: 14px;
            color: rgba(255,255,255,0.6);
            transition: color 0.25s ease;
            padding: 4px 0;
            text-decoration: none;
            cursor: pointer;
            line-height: 1.6;
        }
        .footer-link:hover {
            color: var(--volt);
        }
        
        /* ========== 辅助类 ========== */
        .text-decoration-none {
            text-decoration: none;
        }
        .no-underline {
            text-decoration: none;
        }
        .section-pad {
            padding: 64px 0;
        }
        @media (max-width: 640px) {
            .section-pad {
                padding: 48px 0;
            }
        }

/* roulang page: category3 */
:root {
            --pitch: #1A2E1A;
            --carbon: #0E0E0E;
            --volt: #D4FF3F;
            --paper: #F4F1EA;
            --mist: #E9E5DB;
            --ink: #111111;
            --body: #3B3B3B;
            --muted: #6A6A6A;
            --border-light: rgba(0, 0, 0, 0.08);
            --border-volt: rgba(212, 255, 63, 0.4);
            --radius-card: 14px;
            --radius-btn: 10px;
            --radius-chip: 999px;
            --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.04);
            --shadow-card-hover: 0 8px 28px rgba(0, 0, 0, 0.08);
            --transition: 0.25s ease;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            font-size: 16px;
            line-height: 1.65;
            color: var(--body);
            background-color: var(--paper);
            overflow-x: hidden;
        }
        .container-site {
            max-width: 1200px;
            margin: 0 auto;
            padding-left: 32px;
            padding-right: 32px;
        }
        /* Navigation */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 50;
            background: rgba(244, 241, 234, 0.92);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-light);
            transition: box-shadow 0.3s ease;
        }
        .site-header.scrolled {
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
        }
        .nav-link {
            position: relative;
            font-size: 15px;
            font-weight: 500;
            color: var(--body);
            padding: 8px 14px;
            border-radius: 8px;
            transition: color 0.25s ease, background 0.25s ease;
            white-space: nowrap;
            text-decoration: none;
        }
        .nav-link:hover {
            color: var(--ink);
            background: rgba(0, 0, 0, 0.04);
        }
        .nav-link.active {
            color: var(--pitch);
            font-weight: 700;
        }
        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 14px;
            right: 14px;
            height: 2px;
            background: var(--volt);
            border-radius: 2px;
        }
        .hamburger-btn {
            display: none;
            width: 44px;
            height: 44px;
            align-items: center;
            justify-content: center;
            border: none;
            background: transparent;
            color: var(--ink);
            font-size: 22px;
            cursor: pointer;
            border-radius: 8px;
            transition: background 0.25s ease;
        }
        .hamburger-btn:hover {
            background: rgba(0, 0, 0, 0.06);
        }
        .mobile-menu {
            display: none;
        }
        .mobile-menu.open {
            display: block;
        }
        .desktop-nav {
            display: flex;
        }
        @media (max-width: 1024px) {
            .desktop-nav {
                display: none !important;
            }
            .hamburger-btn {
                display: flex;
            }
            .mobile-menu {
                display: block;
            }
            .btn-primary.hidden-md {
                display: none;
            }
        }
        @media (min-width: 1025px) {
            .mobile-menu {
                display: none !important;
            }
        }
        /* Hero Banner */
        .cat-banner {
            background: linear-gradient(135deg, #F4F1EA 0%, #E9E5DB 100%);
            padding: 48px 0 40px;
            position: relative;
            overflow: hidden;
        }
        .cat-banner::after {
            content: '';
            position: absolute;
            top: -40px;
            right: -20px;
            width: 180px;
            height: 180px;
            border-radius: 50%;
            background: rgba(212, 255, 63, 0.2);
            pointer-events: none;
        }
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--muted);
            margin-bottom: 16px;
            position: relative;
            z-index: 1;
        }
        .breadcrumb a {
            color: var(--muted);
            text-decoration: none;
            transition: color 0.25s ease;
        }
        .breadcrumb a:hover {
            color: var(--pitch);
        }
        .breadcrumb .sep {
            color: rgba(0, 0, 0, 0.25);
        }
        /* Cards */
        .card-base {
            background: #fff;
            border-radius: var(--radius-card);
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-card);
            transition: all var(--transition);
            overflow: hidden;
        }
        .card-base:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-card-hover);
            border-color: var(--border-volt);
        }
        .card-img-wrap {
            position: relative;
            overflow: hidden;
            aspect-ratio: 16 / 9;
            background: var(--mist);
        }
        .card-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.35s ease;
            display: block;
        }
        .card-base:hover .card-img-wrap img {
            transform: scale(1.03);
        }
        .card-body {
            padding: 22px 26px;
        }
        .chip {
            display: inline-flex;
            align-items: center;
            padding: 6px 16px;
            border-radius: var(--radius-chip);
            font-size: 13px;
            font-weight: 600;
            line-height: 1.4;
            transition: all 0.25s ease;
            cursor: pointer;
            white-space: nowrap;
            text-decoration: none;
            border: none;
        }
        .chip-light {
            background: #fff;
            border: 1px solid var(--border-light);
            color: var(--body);
        }
        .chip-light:hover {
            border-color: var(--volt);
            color: var(--pitch);
            background: rgba(212, 255, 63, 0.1);
        }
        .chip-volt {
            background: rgba(212, 255, 63, 0.18);
            color: var(--pitch);
            border: 1px solid var(--border-volt);
        }
        /* Buttons */
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 30px;
            background: var(--pitch);
            color: #fff;
            font-weight: 700;
            font-size: 15px;
            border-radius: var(--radius-btn);
            border: none;
            cursor: pointer;
            transition: all 0.25s ease;
            text-decoration: none;
            line-height: 1.4;
        }
        .btn-primary:hover {
            background: var(--volt);
            color: var(--pitch);
            transform: translateY(-2px);
        }
        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 30px;
            background: transparent;
            color: var(--ink);
            font-weight: 700;
            font-size: 15px;
            border-radius: var(--radius-btn);
            border: 2px solid var(--border-light);
            cursor: pointer;
            transition: all 0.25s ease;
            text-decoration: none;
            line-height: 1.4;
        }
        .btn-secondary:hover {
            border-color: var(--volt);
            background: rgba(212, 255, 63, 0.06);
            color: var(--pitch);
        }
        .btn-ghost {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            color: var(--body);
            font-weight: 600;
            font-size: 15px;
            text-decoration: none;
            padding: 4px 0;
            border-bottom: 2px solid transparent;
            transition: all 0.25s ease;
            cursor: pointer;
            background: none;
        }
        .btn-ghost:hover {
            color: var(--pitch);
            border-bottom-color: var(--volt);
        }
        /* FAQ */
        .faq-item {
            border-bottom: 1px solid var(--border-light);
            padding: 18px 0;
            cursor: pointer;
            transition: all 0.25s ease;
        }
        .faq-item:hover .faq-question {
            color: var(--pitch);
        }
        .faq-question {
            display: flex;
            align-items: flex-start;
            justify-content: space-between;
            gap: 16px;
            font-weight: 700;
            font-size: 17px;
            color: var(--ink);
            transition: color 0.25s ease;
            cursor: pointer;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            padding: 0;
        }
        .faq-arrow {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            background: rgba(0, 0, 0, 0.04);
            transition: transform 0.3s ease, background 0.3s ease;
            font-size: 14px;
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding-top 0.35s ease;
            font-size: 15px;
            color: var(--body);
            line-height: 1.7;
            padding-top: 0;
        }
        .faq-item.active .faq-arrow {
            transform: rotate(180deg);
            background: rgba(212, 255, 63, 0.3);
        }
        .faq-item.active .faq-answer {
            max-height: 300px;
            padding-top: 12px;
        }
        /* Data Panel */
        .data-panel {
            background: var(--pitch);
            border-radius: var(--radius-card);
            padding: 36px 32px;
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
            align-items: stretch;
            justify-content: space-between;
        }
        .data-stat {
            flex: 1;
            min-width: 140px;
            text-align: center;
        }
        .data-stat .stat-num {
            font-size: 44px;
            font-weight: 800;
            color: var(--volt);
            line-height: 1.2;
            letter-spacing: -0.02em;
        }
        .data-stat .stat-label {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.7);
            margin-top: 6px;
        }
        /* Footer */
        .site-footer {
            background: var(--pitch);
            padding: 48px 0 32px;
            margin-top: 80px;
        }
        .footer-link {
            display: block;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.55);
            text-decoration: none;
            transition: color 0.25s ease;
            padding: 4px 0;
            line-height: 1.6;
            background: none;
            border: none;
            cursor: pointer;
            text-align: left;
        }
        .footer-link:hover {
            color: var(--volt);
        }
        /* Section */
        .section {
            padding: 72px 0;
        }
        .section-alt {
            background: #fff;
        }
        .section-title {
            font-size: 32px;
            font-weight: 800;
            color: var(--ink);
            letter-spacing: -0.02em;
            margin-bottom: 12px;
        }
        .section-subtitle {
            font-size: 16px;
            color: var(--muted);
            max-width: 560px;
            line-height: 1.7;
        }
        .section-head {
            margin-bottom: 40px;
        }
        .text-decoration-none {
            text-decoration: none;
        }
        /* Grid gap */
        .grid-gap-sm {
            gap: 16px;
        }
        .grid-gap-md {
            gap: 24px;
        }
        .grid-gap-lg {
            gap: 32px;
        }
        /* Responsive */
        @media (max-width: 768px) {
            .container-site {
                padding-left: 20px;
                padding-right: 20px;
            }
            .section {
                padding: 48px 0;
            }
            .section-title {
                font-size: 26px;
            }
            .cat-banner {
                padding: 32px 0 28px;
            }
            .data-stat .stat-num {
                font-size: 32px;
            }
            .data-panel {
                padding: 24px 18px;
                gap: 16px;
                flex-wrap: nowrap;
                overflow-x: auto;
            }
            .data-stat {
                min-width: 120px;
            }
            .site-footer {
                padding: 36px 0 24px;
                margin-top: 48px;
            }
            .card-body {
                padding: 18px 20px;
            }
        }
        @media (max-width: 520px) {
            .section-title {
                font-size: 22px;
            }
            .section {
                padding: 36px 0;
            }
            .container-site {
                padding-left: 16px;
                padding-right: 16px;
            }
            .card-body {
                padding: 16px;
            }
        }
        /* Hover states for cards */
        .card-link {
            text-decoration: none;
            color: inherit;
            display: block;
        }
        /* Scene info blocks */
        .scene-block {
            background: #fff;
            border-radius: var(--radius-card);
            border: 1px solid var(--border-light);
            padding: 24px;
            transition: all 0.25s ease;
        }
        .scene-block:hover {
            border-color: var(--border-volt);
            box-shadow: var(--shadow-card-hover);
        }
        /* CTA section */
        .cta-section {
            background: var(--carbon);
            border-radius: var(--radius-card);
            padding: 48px 40px;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(212, 255, 63, 0.1) 0%, transparent 70%);
            pointer-events: none;
        }
        .cta-section .cta-title {
            font-size: 28px;
            font-weight: 800;
            color: #fff;
            letter-spacing: -0.02em;
            margin-bottom: 12px;
            position: relative;
            z-index: 1;
        }
        .cta-section .cta-text {
            font-size: 15px;
            color: rgba(255, 255, 255, 0.6);
            margin-bottom: 24px;
            position: relative;
            z-index: 1;
            max-width: 440px;
            line-height: 1.7;
        }
        .cta-section .btn-primary {
            position: relative;
            z-index: 1;
        }

/* roulang page: category4 */
:root {
            --pitch: #1A2E1A;
            --carbon: #0E0E0E;
            --volt: #D4FF3F;
            --paper: #F4F1EA;
            --mist: #E9E5DB;
            --ink: #111111;
            --body: #3B3B3B;
            --muted: #6A6A6A;
            --border-light: rgba(0, 0, 0, 0.08);
            --border-volt: rgba(212, 255, 63, 0.4);
            --radius-card: 14px;
            --radius-btn: 10px;
            --radius-chip: 999px;
            --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.04);
            --shadow-card-hover: 0 8px 28px rgba(0, 0, 0, 0.08);
            --transition: 0.25s ease;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            font-size: 16px;
            line-height: 1.65;
            color: var(--body);
            background-color: var(--paper);
            overflow-x: hidden;
        }
        .container-site {
            max-width: 1200px;
            margin: 0 auto;
            padding-left: 32px;
            padding-right: 32px;
        }
        .site-header {
            position: sticky;
            top: 0;
            z-index: 50;
            background: rgba(244, 241, 234, 0.92);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-light);
            transition: box-shadow 0.3s ease;
        }
        .site-header.scrolled {
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
        }
        .nav-link {
            position: relative;
            font-size: 15px;
            font-weight: 500;
            color: var(--body);
            padding: 8px 14px;
            border-radius: 8px;
            transition: color 0.25s ease, background 0.25s ease;
            white-space: nowrap;
            text-decoration: none;
        }
        .nav-link:hover {
            color: var(--ink);
            background: rgba(0, 0, 0, 0.04);
        }
        .nav-link.active {
            color: var(--pitch);
            font-weight: 700;
        }
        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 14px;
            right: 14px;
            height: 2px;
            background: var(--volt);
            border-radius: 2px;
        }
        .step-separator {
            width: 36px;
            height: 1px;
            background: var(--border-light);
            margin: 0 12px;
            flex-shrink: 0;
        }
        .card-base {
            background: #fff;
            border-radius: var(--radius-card);
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-card);
            transition: all var(--transition);
            overflow: hidden;
        }
        .card-base:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-card-hover);
            border-color: var(--border-volt);
        }
        .card-img-wrap {
            position: relative;
            overflow: hidden;
            aspect-ratio: 16 / 9;
            background: var(--mist);
        }
        .card-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.35s ease;
        }
        .card-base:hover .card-img-wrap img {
            transform: scale(1.03);
        }
        .card-body {
            padding: 22px 26px;
        }
        .chip {
            display: inline-flex;
            align-items: center;
            padding: 6px 16px;
            border-radius: var(--radius-chip);
            font-size: 13px;
            font-weight: 600;
            line-height: 1.4;
            transition: all 0.25s ease;
            cursor: pointer;
            white-space: nowrap;
            text-decoration: none;
        }
        .chip-light {
            background: #fff;
            border: 1px solid var(--border-light);
            color: var(--body);
        }
        .chip-light:hover {
            border-color: var(--volt);
            color: var(--pitch);
            background: rgba(212, 255, 63, 0.1);
        }
        .chip-dark {
            background: rgba(212, 255, 63, 0.1);
            border: 1px solid rgba(212, 255, 63, 0.3);
            color: var(--pitch);
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 30px;
            background: var(--pitch);
            color: #fff;
            font-weight: 700;
            font-size: 15px;
            border-radius: var(--radius-btn);
            border: none;
            cursor: pointer;
            transition: all 0.25s ease;
            text-decoration: none;
            line-height: 1.4;
        }
        .btn-primary:hover {
            background: var(--volt);
            color: var(--pitch);
            transform: translateY(-2px);
        }
        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 30px;
            background: transparent;
            color: var(--ink);
            font-weight: 700;
            font-size: 15px;
            border-radius: var(--radius-btn);
            border: 2px solid var(--border-light);
            cursor: pointer;
            transition: all 0.25s ease;
            text-decoration: none;
            line-height: 1.4;
        }
        .btn-secondary:hover {
            border-color: var(--volt);
            background: rgba(212, 255, 63, 0.06);
            color: var(--pitch);
        }
        .btn-ghost {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            color: var(--body);
            font-weight: 600;
            font-size: 15px;
            text-decoration: none;
            padding: 4px 0;
            border-bottom: 2px solid transparent;
            transition: all 0.25s ease;
            cursor: pointer;
        }
        .btn-ghost:hover {
            border-bottom-color: var(--volt);
            color: var(--pitch);
        }
        .hamburger-btn {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            font-size: 20px;
            color: var(--ink);
            padding: 8px;
            transition: color 0.25s ease;
        }
        .hamburger-btn:hover {
            color: var(--pitch);
        }
        .mobile-menu {
            display: none;
            overflow: hidden;
            transition: max-height 0.3s ease;
        }
        .mobile-menu.open {
            display: block;
        }
        .site-footer {
            background: var(--pitch);
            color: rgba(255, 255, 255, 0.7);
            padding: 56px 0 32px;
        }
        .footer-link {
            display: inline-block;
            color: rgba(255, 255, 255, 0.55);
            font-size: 14px;
            text-decoration: none;
            transition: color 0.25s ease;
            padding: 4px 0;
            line-height: 1.6;
        }
        .footer-link:hover {
            color: var(--volt);
        }
        .breadcrumb-link {
            color: var(--muted);
            text-decoration: none;
            font-size: 14px;
            transition: color 0.25s ease;
        }
        .breadcrumb-link:hover {
            color: var(--pitch);
        }
        .breadcrumb-divider {
            color: var(--muted);
            font-size: 13px;
            margin: 0 8px;
        }
        .category-banner {
            background: var(--mist);
            border-bottom: 1px solid var(--border-light);
            padding: 40px 0;
        }
        .banner-title {
            font-size: 36px;
            font-weight: 800;
            color: var(--ink);
            letter-spacing: -0.02em;
            margin-bottom: 4px;
        }
        .banner-subtitle {
            font-size: 15px;
            color: var(--muted);
            margin-top: 6px;
        }
        .scene-card-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .scene-card-grid .card-base {
            display: flex;
            flex-direction: column;
        }
        .scene-card-grid .card-body {
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .scene-card-grid .card-body .scene-excerpt {
            flex: 1;
        }
        .scene-info-block {
            background: #fff;
            border-radius: var(--radius-card);
            border: 1px solid var(--border-light);
            padding: 26px 28px;
            transition: all var(--transition);
        }
        .scene-info-block:hover {
            border-color: var(--border-volt);
            box-shadow: var(--shadow-card-hover);
        }
        .data-panel-section {
            background: var(--pitch);
            border-radius: var(--radius-card);
            padding: 48px 40px;
            color: #fff;
        }
        .data-panel-item {
            text-align: center;
            padding: 12px 16px;
        }
        .data-panel-number {
            font-size: 52px;
            font-weight: 800;
            color: var(--volt);
            letter-spacing: -0.03em;
            line-height: 1.1;
            font-family: 'Inter', 'Roboto Mono', sans-serif;
        }
        .data-panel-label {
            font-size: 15px;
            color: rgba(255, 255, 255, 0.7);
            margin-top: 8px;
            font-weight: 500;
        }
        .faq-item {
            border-bottom: 1px solid var(--border-light);
            padding: 20px 0;
        }
        .faq-item:first-child {
            border-top: 1px solid var(--border-light);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            cursor: pointer;
            font-weight: 700;
            font-size: 17px;
            color: var(--ink);
            transition: color 0.25s ease;
            padding: 4px 0;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
        }
        .faq-question:hover {
            color: var(--pitch);
        }
        .faq-question .faq-icon {
            font-size: 14px;
            color: var(--muted);
            transition: transform 0.3s ease;
            flex-shrink: 0;
        }
        .faq-question.active .faq-icon {
            transform: rotate(45deg);
            color: var(--pitch);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease;
            color: var(--body);
            font-size: 15px;
            line-height: 1.7;
        }
        .faq-answer.open {
            max-height: 300px;
        }
        .faq-answer-inner {
            padding: 12px 0 8px;
            max-width: 680px;
        }
        .cta-section {
            background: var(--carbon);
            border-radius: var(--radius-card);
            padding: 56px 40px;
            color: #fff;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: -40px;
            right: -40px;
            width: 240px;
            height: 240px;
            background: rgba(212, 255, 63, 0.06);
            border-radius: 50%;
            pointer-events: none;
        }
        .arrow-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            color: var(--pitch);
            font-weight: 600;
            font-size: 14px;
            text-decoration: none;
            transition: all 0.25s ease;
            cursor: pointer;
        }
        .arrow-link:hover {
            color: var(--ink);
            gap: 10px;
        }
        @media (max-width: 1024px) {
            .scene-card-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
            .container-site {
                padding-left: 24px;
                padding-right: 24px;
            }
            .banner-title {
                font-size: 30px;
            }
            .data-panel-number {
                font-size: 40px;
            }
            .data-panel-section {
                padding: 36px 28px;
            }
            .cta-section {
                padding: 44px 28px;
            }
        }
        @media (min-width: 768px) {
            .desktop-nav {
                display: flex !important;
            }
            .hamburger-btn {
                display: none !important;
            }
        }
        @media (max-width: 767px) {
            .desktop-nav {
                display: none !important;
            }
            .hamburger-btn {
                display: block;
            }
            .mobile-menu {
                display: none;
            }
            .mobile-menu.open {
                display: block;
            }
            .container-site {
                padding-left: 16px;
                padding-right: 16px;
            }
            .scene-card-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .banner-title {
                font-size: 26px;
            }
            .category-banner {
                padding: 28px 0;
            }
            .data-panel-section {
                padding: 28px 20px;
                border-radius: 12px;
            }
            .data-panel-number {
                font-size: 32px;
            }
            .data-panel-label {
                font-size: 13px;
            }
            .cta-section {
                padding: 32px 20px;
                border-radius: 12px;
            }
            .card-body {
                padding: 16px 18px;
            }
            .scene-info-block {
                padding: 18px 20px;
            }
            .faq-question {
                font-size: 15px;
            }
        }
        @media (max-width: 520px) {
            .data-panel-section {
                padding: 22px 14px;
            }
            .data-panel-number {
                font-size: 26px;
            }
            .data-panel-label {
                font-size: 12px;
            }
        }

/* roulang page: category5 */
:root {
            --pitch: #1A2E1A;
            --carbon: #0E0E0E;
            --volt: #D4FF3F;
            --paper: #F4F1EA;
            --mist: #E9E5DB;
            --ink: #111111;
            --body: #3B3B3B;
            --muted: #6A6A6A;
            --border-light: rgba(0, 0, 0, 0.08);
            --border-volt: rgba(212, 255, 63, 0.4);
            --radius-card: 14px;
            --radius-btn: 10px;
            --radius-chip: 999px;
            --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.04);
            --shadow-card-hover: 0 8px 28px rgba(0, 0, 0, 0.08);
            --transition: 0.25s ease;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
            font-size: 16px;
            line-height: 1.65;
            color: var(--body);
            background-color: var(--paper);
            overflow-x: hidden;
        }

        .container-site {
            max-width: 1200px;
            margin: 0 auto;
            padding-left: 32px;
            padding-right: 32px;
        }

        /* Navigation */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 50;
            background: rgba(244, 241, 234, 0.92);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-light);
            transition: box-shadow 0.3s ease;
        }

        .site-header.scrolled {
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
        }

        .nav-link {
            position: relative;
            font-size: 15px;
            font-weight: 500;
            color: var(--body);
            padding: 8px 14px;
            border-radius: 8px;
            transition: color 0.25s ease, background 0.25s ease;
            white-space: nowrap;
            text-decoration: none;
        }

        .nav-link:hover {
            color: var(--ink);
            background: rgba(0, 0, 0, 0.04);
        }

        .nav-link.active {
            color: var(--pitch);
            font-weight: 700;
        }

        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 14px;
            right: 14px;
            height: 2px;
            background: var(--volt);
            border-radius: 2px;
        }

        .step-separator {
            width: 36px;
            height: 1px;
            background: var(--border-light);
            margin: 0 12px;
            flex-shrink: 0;
        }

        .hamburger-btn {
            display: none;
            background: none;
            border: none;
            font-size: 22px;
            color: var(--ink);
            cursor: pointer;
            padding: 8px;
            border-radius: 8px;
            transition: background 0.25s ease;
        }

        .hamburger-btn:hover {
            background: rgba(0, 0, 0, 0.06);
        }

        .mobile-menu {
            transition: all 0.3s ease;
        }

        .mobile-menu.hidden {
            display: none;
        }

        /* Cards */
        .card-base {
            background: #fff;
            border-radius: var(--radius-card);
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-card);
            transition: all var(--transition);
            overflow: hidden;
        }

        .card-base:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-card-hover);
            border-color: var(--border-volt);
        }

        .card-img-wrap {
            position: relative;
            overflow: hidden;
            aspect-ratio: 16 / 9;
            background: var(--mist);
        }

        .card-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.35s ease;
            display: block;
        }

        .card-base:hover .card-img-wrap img {
            transform: scale(1.03);
        }

        .card-body {
            padding: 22px 26px;
        }

        .chip {
            display: inline-flex;
            align-items: center;
            padding: 6px 16px;
            border-radius: var(--radius-chip);
            font-size: 13px;
            font-weight: 600;
            line-height: 1.4;
            transition: all 0.25s ease;
            cursor: pointer;
            white-space: nowrap;
            text-decoration: none;
        }

        .chip-light {
            background: #fff;
            border: 1px solid var(--border-light);
            color: var(--body);
        }

        .chip-light:hover {
            border-color: var(--volt);
            color: var(--pitch);
            background: rgba(212, 255, 63, 0.1);
        }

        .chip-dark {
            background: var(--pitch);
            color: var(--volt);
            border: 1px solid var(--pitch);
        }

        /* Buttons */
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 30px;
            background: var(--pitch);
            color: #fff;
            font-weight: 700;
            font-size: 15px;
            border-radius: var(--radius-btn);
            border: none;
            cursor: pointer;
            transition: all 0.25s ease;
            text-decoration: none;
            line-height: 1.4;
        }

        .btn-primary:hover {
            background: var(--volt);
            color: var(--pitch);
            transform: translateY(-2px);
        }

        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 30px;
            background: transparent;
            color: var(--ink);
            font-weight: 700;
            font-size: 15px;
            border-radius: var(--radius-btn);
            border: 2px solid var(--border-light);
            cursor: pointer;
            transition: all 0.25s ease;
            text-decoration: none;
            line-height: 1.4;
        }

        .btn-secondary:hover {
            border-color: var(--volt);
            background: rgba(212, 255, 63, 0.06);
            color: var(--pitch);
        }

        .btn-ghost {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            color: var(--body);
            font-weight: 600;
            font-size: 15px;
            text-decoration: none;
            padding: 4px 0;
            border-bottom: 2px solid transparent;
            transition: all 0.25s ease;
            cursor: pointer;
        }

        .btn-ghost:hover {
            color: var(--pitch);
            border-bottom-color: var(--volt);
        }

        /* Breadcrumb */
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--muted);
        }

        .breadcrumb a {
            color: var(--muted);
            text-decoration: none;
            transition: color 0.25s ease;
        }

        .breadcrumb a:hover {
            color: var(--pitch);
        }

        .breadcrumb .sep {
            color: var(--border-light);
        }

        .breadcrumb .current {
            color: var(--ink);
            font-weight: 600;
        }

        /* Section */
        .section-pad {
            padding: 72px 0;
        }

        .section-pad-sm {
            padding: 48px 0;
        }

        .section-title {
            font-size: 34px;
            font-weight: 800;
            color: var(--ink);
            letter-spacing: -0.02em;
            line-height: 1.3;
            margin-bottom: 16px;
        }

        .section-subtitle {
            font-size: 18px;
            color: var(--muted);
            line-height: 1.7;
            max-width: 680px;
        }

        /* FAQ */
        .faq-item {
            border-bottom: 1px solid var(--border-light);
            padding: 18px 0;
        }

        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            cursor: pointer;
            font-weight: 700;
            font-size: 16px;
            color: var(--ink);
            transition: color 0.25s ease;
            gap: 12px;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            padding: 0;
        }

        .faq-question:hover {
            color: var(--pitch);
        }

        .faq-question .faq-icon {
            flex-shrink: 0;
            transition: transform 0.25s ease;
            font-size: 14px;
            color: var(--muted);
        }

        .faq-item.open .faq-icon {
            transform: rotate(45deg);
            color: var(--pitch);
        }

        .faq-answer {
            display: none;
            padding-top: 12px;
            font-size: 15px;
            color: var(--body);
            line-height: 1.7;
        }

        .faq-item.open .faq-answer {
            display: block;
        }

        /* Stat panel */
        .stat-panel {
            background: var(--pitch);
            border-radius: var(--radius-card);
            padding: 28px 24px;
            text-align: center;
            transition: all 0.3s ease;
            border: 1px solid rgba(212, 255, 63, 0.15);
        }

        .stat-panel:hover {
            border-color: var(--volt);
            transform: translateY(-3px);
        }

        .stat-panel .stat-number {
            font-size: 42px;
            font-weight: 800;
            color: var(--volt);
            letter-spacing: -0.02em;
            line-height: 1.2;
        }

        .stat-panel .stat-label {
            font-size: 15px;
            color: rgba(255, 255, 255, 0.8);
            margin-top: 8px;
            font-weight: 500;
        }

        /* Footer */
        .site-footer {
            background: var(--pitch);
            color: rgba(255, 255, 255, 0.7);
            padding: 56px 0 28px;
            margin-top: 0;
        }

        .footer-link {
            display: block;
            color: rgba(255, 255, 255, 0.55);
            font-size: 14px;
            text-decoration: none;
            padding: 4px 0;
            transition: color 0.25s ease;
            cursor: pointer;
        }

        .footer-link:hover {
            color: var(--volt);
        }

        /* Page banner */
        .page-banner {
            background: #fff;
            border-bottom: 1px solid var(--border-light);
            padding: 56px 0 40px;
        }

        .page-banner h1 {
            font-size: 42px;
            font-weight: 800;
            color: var(--ink);
            letter-spacing: -0.02em;
            line-height: 1.25;
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .container-site {
                padding-left: 24px;
                padding-right: 24px;
            }
            .desktop-nav {
                gap: 0.5rem;
            }
            .desktop-nav .nav-link {
                padding: 8px 10px;
                font-size: 14px;
            }
            .section-title {
                font-size: 28px;
            }
            .page-banner h1 {
                font-size: 34px;
            }
        }

        @media (max-width: 768px) {
            .container-site {
                padding-left: 20px;
                padding-right: 20px;
            }
            .desktop-nav {
                display: none !important;
            }
            .hamburger-btn {
                display: inline-flex;
                align-items: center;
                justify-content: center;
            }
            .section-pad {
                padding: 48px 0;
            }
            .section-pad-sm {
                padding: 36px 0;
            }
            .section-title {
                font-size: 26px;
            }
            .page-banner {
                padding: 40px 0 32px;
            }
            .page-banner h1 {
                font-size: 30px;
            }
            .stat-panel .stat-number {
                font-size: 32px;
            }
        }

        @media (max-width: 520px) {
            .container-site {
                padding-left: 16px;
                padding-right: 16px;
            }
            .section-title {
                font-size: 22px;
            }
            .page-banner h1 {
                font-size: 26px;
            }
            .card-body {
                padding: 16px 18px;
            }
            .btn-primary {
                padding: 12px 22px;
                font-size: 14px;
            }
            .btn-secondary {
                padding: 12px 22px;
                font-size: 14px;
            }
        }

/* roulang page: category6 */
:root {
            --pitch: #1A2E1A;
            --carbon: #0E0E0E;
            --volt: #D4FF3F;
            --paper: #F4F1EA;
            --mist: #E9E5DB;
            --ink: #111111;
            --body: #3B3B3B;
            --muted: #6A6A6A;
            --border-light: rgba(0, 0, 0, 0.08);
            --border-volt: rgba(212, 255, 63, 0.4);
            --radius-card: 14px;
            --radius-btn: 10px;
            --radius-chip: 999px;
            --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.04);
            --shadow-card-hover: 0 8px 28px rgba(0, 0, 0, 0.08);
            --transition: 0.25s ease;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            font-size: 16px;
            line-height: 1.65;
            color: var(--body);
            background-color: var(--paper);
            overflow-x: hidden;
        }
        .container-site {
            max-width: 1200px;
            margin: 0 auto;
            padding-left: 32px;
            padding-right: 32px;
        }
        .site-header {
            position: sticky;
            top: 0;
            z-index: 50;
            background: rgba(244, 241, 234, 0.92);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-light);
            transition: box-shadow 0.3s ease;
        }
        .site-header.scrolled {
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
        }
        .nav-link {
            position: relative;
            font-size: 15px;
            font-weight: 500;
            color: var(--body);
            padding: 8px 14px;
            border-radius: 8px;
            transition: color 0.25s ease, background 0.25s ease;
            white-space: nowrap;
        }
        .nav-link:hover {
            color: var(--ink);
            background: rgba(0, 0, 0, 0.04);
        }
        .nav-link.active {
            color: var(--pitch);
            font-weight: 700;
        }
        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 14px;
            right: 14px;
            height: 2px;
            background: var(--volt);
            border-radius: 2px;
        }
        .hamburger-btn {
            display: none;
            background: none;
            border: none;
            font-size: 22px;
            color: var(--ink);
            cursor: pointer;
            padding: 8px;
            border-radius: 8px;
            transition: background 0.25s ease;
        }
        .hamburger-btn:hover {
            background: rgba(0, 0, 0, 0.04);
        }
        .mobile-menu {
            display: none;
        }
        .mobile-menu.open {
            display: block;
        }
        .card-base {
            background: #fff;
            border-radius: var(--radius-card);
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-card);
            transition: all var(--transition);
            overflow: hidden;
        }
        .card-base:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-card-hover);
            border-color: var(--border-volt);
        }
        .card-img-wrap {
            position: relative;
            overflow: hidden;
            aspect-ratio: 16 / 9;
            background: var(--mist);
        }
        .card-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.35s ease;
        }
        .card-base:hover .card-img-wrap img {
            transform: scale(1.03);
        }
        .card-body {
            padding: 22px 26px;
        }
        .chip {
            display: inline-flex;
            align-items: center;
            padding: 6px 16px;
            border-radius: var(--radius-chip);
            font-size: 13px;
            font-weight: 600;
            line-height: 1.4;
            transition: all 0.25s ease;
            cursor: pointer;
            white-space: nowrap;
            text-decoration: none;
        }
        .chip-light {
            background: #fff;
            border: 1px solid var(--border-light);
            color: var(--body);
        }
        .chip-light:hover {
            border-color: var(--volt);
            color: var(--pitch);
            background: rgba(212, 255, 63, 0.1);
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 30px;
            background: var(--pitch);
            color: #fff;
            font-weight: 700;
            font-size: 15px;
            border-radius: var(--radius-btn);
            border: none;
            cursor: pointer;
            transition: all 0.25s ease;
            text-decoration: none;
            line-height: 1.4;
        }
        .btn-primary:hover {
            background: var(--volt);
            color: var(--pitch);
            transform: translateY(-2px);
        }
        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 30px;
            background: transparent;
            color: var(--ink);
            font-weight: 700;
            font-size: 15px;
            border-radius: var(--radius-btn);
            border: 2px solid var(--border-light);
            cursor: pointer;
            transition: all 0.25s ease;
            text-decoration: none;
            line-height: 1.4;
        }
        .btn-secondary:hover {
            border-color: var(--volt);
            background: rgba(212, 255, 63, 0.06);
            color: var(--pitch);
        }
        .btn-ghost {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            color: var(--body);
            font-weight: 600;
            font-size: 15px;
            text-decoration: none;
            padding: 4px 0;
            border-bottom: 2px solid transparent;
            transition: all 0.25s ease;
            cursor: pointer;
        }
        .btn-ghost:hover {
            color: var(--pitch);
            border-bottom-color: var(--volt);
        }
        .banner-section {
            background: var(--mist);
            padding: 48px 0 40px;
            border-bottom: 1px solid var(--border-light);
        }
        .breadcrumb {
            font-size: 13px;
            color: var(--muted);
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .breadcrumb a {
            color: var(--muted);
            text-decoration: none;
            transition: color 0.25s ease;
        }
        .breadcrumb a:hover {
            color: var(--pitch);
        }
        .divider-line {
            height: 1px;
            background: var(--border-light);
            border: none;
            margin: 0;
        }
        .data-panel {
            background: var(--pitch);
            border-radius: var(--radius-card);
            padding: 32px 28px;
            color: #fff;
        }
        .data-panel .data-item {
            text-align: center;
        }
        .data-panel .data-value {
            font-family: 'Inter', 'SF Mono', 'Roboto Mono', monospace;
            font-size: 42px;
            font-weight: 700;
            color: var(--volt);
            line-height: 1.1;
        }
        .data-panel .data-label {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.7);
            margin-top: 6px;
        }
        .faq-item {
            border-bottom: 1px solid var(--border-light);
            padding: 18px 0;
        }
        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            font-weight: 700;
            color: var(--ink);
            font-size: 16px;
            gap: 16px;
            transition: color 0.25s ease;
        }
        .faq-question:hover {
            color: var(--pitch);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding-top 0.35s ease;
            color: var(--body);
            font-size: 15px;
            line-height: 1.7;
        }
        .faq-item.open .faq-answer {
            max-height: 200px;
            padding-top: 12px;
        }
        .faq-item.open .faq-icon {
            transform: rotate(45deg);
        }
        .faq-icon {
            transition: transform 0.35s ease;
            font-size: 18px;
            color: var(--muted);
            flex-shrink: 0;
        }
        .site-footer {
            background: var(--pitch);
            color: #fff;
            padding: 64px 0 28px;
        }
        .footer-link {
            color: rgba(255, 255, 255, 0.6);
            text-decoration: none;
            font-size: 14px;
            transition: color 0.25s ease;
            display: inline-block;
            line-height: 1.6;
        }
        .footer-link:hover {
            color: var(--volt);
        }
        .tip-number {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: var(--pitch);
            color: var(--volt);
            font-weight: 700;
            font-size: 16px;
            flex-shrink: 0;
        }
        .section-spacing {
            padding: 64px 0;
        }
        .section-alt {
            background: #fff;
        }
        @media (max-width: 1024px) {
            .desktop-nav {
                display: none !important;
            }
            .hamburger-btn {
                display: block;
            }
            .btn-primary.hidden {
                display: none;
            }
            .btn-primary.md\:inline-flex {
                display: none;
            }
            .hidden.md\:inline-flex {
                display: none;
            }
            .nav-cta-desktop {
                display: none;
            }
        }
        @media (min-width: 1025px) {
            .hamburger-btn {
                display: none !important;
            }
            .mobile-menu {
                display: none !important;
            }
        }
        @media (max-width: 768px) {
            .container-site {
                padding-left: 20px;
                padding-right: 20px;
            }
            .section-spacing {
                padding: 40px 0;
            }
            .data-panel .data-value {
                font-size: 30px;
            }
            .card-body {
                padding: 18px 18px;
            }
            .banner-section {
                padding: 32px 0 28px;
            }
            .banner-section h1 {
                font-size: 28px !important;
            }
        }
        @media (max-width: 520px) {
            .container-site {
                padding-left: 16px;
                padding-right: 16px;
            }
            .data-panel {
                padding: 24px 16px;
            }
            .data-panel .data-value {
                font-size: 26px;
            }
            .card-img-wrap {
                aspect-ratio: 16 / 10;
            }
        }
        @media (min-width: 769px) and (max-width: 1024px) {
            .desktop-nav {
                display: none !important;
            }
            .hamburger-btn {
                display: flex;
            }
            .nav-cta-desktop {
                display: none;
            }
            .btn-primary.hidden.md\:inline-flex {
                display: none;
            }
        }
        .nav-cta-desktop {
            display: inline-flex;
        }
        @media (min-width: 1025px) {
            .nav-cta-desktop {
                display: inline-flex;
            }
            .hamburger-btn {
                display: none !important;
            }
        }
        @media (max-width: 1024px) {
            .nav-cta-desktop {
                display: none !important;
            }
            .hamburger-btn {
                display: flex;
            }
            .desktop-nav {
                display: none !important;
            }
        }
        .desktop-nav {
            display: flex;
        }
        @media (min-width: 1025px) {
            .desktop-nav {
                display: flex !important;
            }
            .hamburger-btn {
                display: none !important;
            }
            .mobile-menu {
                display: none !important;
            }
        }
        @media (max-width: 1024px) {
            .nav-cta-desktop {
                display: none !important;
            }
        }
        .nav-cta-desktop {
            display: inline-flex;
        }
        @media (max-width: 1024px) {
            .nav-cta-desktop {
                display: none !important;
            }
            .hamburger-btn {
                display: flex !important;
            }
            .desktop-nav {
                display: none !important;
            }
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
        }