/* roulang page: index */
:root {
            --bg-dark: #0E1013;
            --bg-panel: #15181D;
            --text-primary: #F4F5F1;
            --text-ghost: #9AA0A6;
            --line-dark: #2A2F35;
            --bg-light: #F4F5F1;
            --text-ink: #1A1D20;
            --accent: #C6FF3D;
            --accent-vermilion: #FF4A2D;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-full: 999px;
            --shadow-dark: 0 24px 60px rgba(0, 0, 0, 0.28);
            --shadow-light: 0 12px 30px rgba(20, 20, 20, 0.08);
            --spacing-8: 8px;
            --spacing-16: 16px;
            --spacing-24: 24px;
            --spacing-32: 32px;
            --spacing-48: 48px;
            --spacing-64: 64px;
            --spacing-96: 96px;
            --spacing-120: 120px;
        }

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

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

        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Inter', sans-serif;
            line-height: 1.85;
            background-color: var(--bg-dark);
            color: var(--text-primary);
            overflow-x: hidden;
            font-size: 16px;
        }

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

        a {
            color: inherit;
            text-decoration: none;
            transition: color 0.25s ease, border-color 0.25s ease;
        }

        button,
        input,
        textarea,
        select {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            background: none;
            color: inherit;
        }

        button {
            cursor: pointer;
        }

        .container {
            max-width: 1360px;
            margin: 0 auto;
            padding: 0 32px;
        }

        .focus-ring:focus-visible {
            outline: 2px solid var(--accent-vermilion);
            outline-offset: 4px;
            border-radius: 4px;
        }

        .btn-primary {
            background-color: var(--accent);
            color: #0E1013;
            font-weight: 700;
            padding: 14px 32px;
            border-radius: var(--radius-full);
            transition: all 0.25s ease;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 15px;
            letter-spacing: 0.01em;
            line-height: 1.4;
            border: 2px solid var(--accent);
        }
        .btn-primary:hover {
            background-color: #d2ff5e;
            border-color: #d2ff5e;
            transform: translateY(-2px);
            box-shadow: 0 12px 28px rgba(198, 255, 61, 0.22);
        }
        .btn-primary:active {
            transform: scale(0.98);
            box-shadow: none;
        }

        .btn-secondary {
            background: transparent;
            color: var(--text-primary);
            font-weight: 600;
            padding: 12px 20px;
            border-radius: var(--radius-full);
            border: 1.5px solid var(--line-dark);
            transition: all 0.25s ease;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 15px;
            letter-spacing: 0.01em;
            line-height: 1.4;
        }
        .btn-secondary:hover {
            border-color: var(--accent);
            color: var(--accent);
            transform: translateY(-2px);
        }
        .btn-secondary:active {
            transform: scale(0.98);
        }

        .btn-ghost-link {
            background: transparent;
            color: var(--accent);
            font-weight: 600;
            padding: 10px 4px;
            border-bottom: 2px solid var(--accent);
            transition: all 0.25s ease;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 15px;
            letter-spacing: 0.01em;
            line-height: 1.4;
            border-radius: 0;
        }
        .btn-ghost-link:hover {
            color: #d2ff5e;
            border-bottom-width: 3px;
            padding-left: 8px;
        }

        .section-label {
            font-family: 'Roboto Mono', 'Inter', monospace;
            font-size: 13px;
            font-weight: 500;
            letter-spacing: 0.12em;
            text-transform: uppercase;
            color: var(--accent);
            margin-bottom: 12px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .section-label::before {
            content: '';
            width: 24px;
            height: 2px;
            background: var(--accent);
            display: inline-block;
        }

        .section-title {
            font-size: clamp(2rem, 4vw, 3rem);
            font-weight: 800;
            letter-spacing: -0.02em;
            line-height: 1.25;
            margin-bottom: 16px;
            color: var(--text-primary);
        }

        .section-desc {
            font-size: 1.1rem;
            color: var(--text-ghost);
            line-height: 1.9;
            margin-bottom: 40px;
            max-width: 720px;
        }

        .nav-link {
            font-size: 0.92rem;
            font-weight: 500;
            color: var(--text-ghost);
            letter-spacing: 0.02em;
            padding: 6px 0;
            position: relative;
            transition: color 0.25s ease;
            white-space: nowrap;
        }
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--accent);
            transition: width 0.3s ease;
        }
        .nav-link:hover,
        .nav-link.active {
            color: var(--text-primary);
        }
        .nav-link:hover::after,
        .nav-link.active::after {
            width: 100%;
        }
        .nav-link.active::before {
            content: '';
            position: absolute;
            top: 50%;
            left: -16px;
            transform: translateY(-50%);
            width: 6px;
            height: 6px;
            background: var(--accent);
            border-radius: 50%;
        }

        .card-hover {
            transition: all 0.3s ease;
        }
        .card-hover:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-dark);
            border-color: var(--accent) !important;
        }
        .card-hover:hover .card-img {
            transform: scale(1.04);
        }
        .card-img {
            transition: transform 0.4s ease;
        }

        .accordion-item {
            border-bottom: 1px solid var(--line-dark);
            transition: background-color 0.3s ease;
        }
        .accordion-item:last-child {
            border-bottom: none;
        }
        .accordion-trigger {
            display: flex;
            justify-content: space-between;
            align-items: center;
            width: 100%;
            padding: 20px 8px;
            font-weight: 600;
            font-size: 1.05rem;
            color: var(--text-primary);
            position: relative;
            transition: color 0.25s ease;
            text-align: left;
            gap: 16px;
        }
        .accordion-trigger:hover {
            color: var(--accent);
        }
        .accordion-trigger .icon {
            flex-shrink: 0;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            border: 1.5px solid var(--line-dark);
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all 0.3s ease;
            font-size: 1.1rem;
            color: var(--accent);
        }
        .accordion-trigger.active .icon {
            transform: rotate(45deg);
            border-color: var(--accent);
        }
        .accordion-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 8px;
        }
        .accordion-content.open {
            max-height: 400px;
            padding: 0 8px 24px 8px;
        }
        .accordion-content p {
            color: var(--text-ghost);
            font-size: 1rem;
            line-height: 1.85;
        }

        .news-item {
            border-left: 3px solid var(--line-dark);
            padding: 16px 20px;
            transition: all 0.3s ease;
            border-radius: 0 var(--radius-md) var(--radius-md) 0;
        }
        .news-item:hover {
            border-left-color: var(--accent);
            background-color: rgba(198, 255, 61, 0.04);
        }

        .price-card {
            background: var(--bg-panel);
            border: 1px solid var(--line-dark);
            border-radius: var(--radius-md);
            padding: 32px 28px;
            transition: all 0.3s ease;
            position: relative;
        }
        .price-card:hover {
            border-color: var(--accent);
            transform: translateY(-4px);
            box-shadow: var(--shadow-dark);
        }
        .price-card.featured {
            background: var(--bg-panel);
            border: 2px solid var(--accent);
            transform: scale(1.03);
            z-index: 2;
        }
        .price-card.featured:hover {
            transform: scale(1.03) translateY(-4px);
        }

        .stat-number {
            font-family: 'Roboto Mono', 'Inter', monospace;
            font-weight: 700;
            letter-spacing: -0.03em;
            color: var(--accent);
        }

        .timeline-dot {
            width: 14px;
            height: 14px;
            border-radius: 50%;
            background: var(--accent);
            flex-shrink: 0;
            margin-top: 6px;
            box-shadow: 0 0 0 4px rgba(198, 255, 61, 0.18);
        }

        .mobile-menu {
            position: fixed;
            top: 0;
            right: -100%;
            width: 100%;
            height: 100vh;
            background: var(--bg-dark);
            z-index: 1000;
            transition: right 0.4s ease;
            display: flex;
            flex-direction: column;
            padding: 32px;
            overflow-y: auto;
        }
        .mobile-menu.open {
            right: 0;
        }

        .hero-section {
            min-height: 88vh;
            display: flex;
            align-items: center;
            position: relative;
            background-image: linear-gradient(to bottom, rgba(14, 16, 19, 0.88), rgba(14, 16, 19, 0.72)), url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
        }
        .hero-section::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: repeating-linear-gradient(0deg, transparent, transparent 60px, rgba(198, 255, 61, 0.03) 60px, rgba(198, 255, 61, 0.03) 61px);
            pointer-events: none;
        }

        .light-section {
            background: var(--bg-light);
            color: var(--text-ink);
        }
        .light-section .section-title {
            color: var(--text-ink);
        }
        .light-section .section-desc {
            color: #555B5F;
        }

        .badge-acid {
            display: inline-block;
            background: rgba(198, 255, 61, 0.15);
            color: var(--accent);
            font-size: 0.8rem;
            font-weight: 600;
            padding: 4px 14px;
            border-radius: var(--radius-full);
            letter-spacing: 0.04em;
            border: 1px solid rgba(198, 255, 61, 0.3);
        }

        .badge-vermilion {
            display: inline-block;
            background: rgba(255, 74, 45, 0.15);
            color: var(--accent-vermilion);
            font-size: 0.8rem;
            font-weight: 600;
            padding: 4px 14px;
            border-radius: var(--radius-full);
            letter-spacing: 0.04em;
            border: 1px solid rgba(255, 74, 45, 0.3);
        }

        .list-check li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            margin-bottom: 12px;
            color: var(--text-ghost);
            font-size: 0.97rem;
        }
        .list-check li::before {
            content: '✓';
            color: var(--accent);
            font-weight: 700;
            flex-shrink: 0;
            margin-top: 2px;
        }

        .scrollbar-hide::-webkit-scrollbar {
            display: none;
        }
        .scrollbar-hide {
            scrollbar-width: none;
        }

        @media (max-width: 1024px) {
            .container {
                padding: 0 24px;
            }
            .hero-section {
                min-height: 75vh;
            }
            .section-title {
                font-size: 2rem;
            }
            .section-desc {
                font-size: 1rem;
            }
            .price-card.featured {
                transform: scale(1);
            }
            .price-card.featured:hover {
                transform: translateY(-4px);
            }
        }

        @media (max-width: 768px) {
            .container {
                padding: 0 16px;
            }
            .hero-section {
                min-height: 70vh;
                padding: 60px 0;
            }
            .section-title {
                font-size: 1.7rem;
                line-height: 1.3;
            }
            .section-desc {
                font-size: 0.95rem;
                margin-bottom: 28px;
            }
            .btn-primary,
            .btn-secondary {
                padding: 12px 24px;
                font-size: 0.9rem;
            }
            .nav-link.active::before {
                display: none;
            }
            .price-card {
                padding: 24px 20px;
            }
            .price-card.featured {
                transform: none;
            }
            .accordion-trigger {
                font-size: 0.95rem;
                padding: 16px 4px;
            }
        }

        @media (max-width: 520px) {
            .section-title {
                font-size: 1.45rem;
            }
            .section-desc {
                font-size: 0.9rem;
            }
            .btn-primary,
            .btn-secondary {
                width: 100%;
                justify-content: center;
                padding: 12px 16px;
                font-size: 0.87rem;
            }
            .mobile-menu {
                padding: 20px;
            }
        }

        @media (max-width: 375px) {
            .container {
                padding: 0 12px;
            }
            .section-title {
                font-size: 1.3rem;
            }
        }

/* roulang page: category3 */
:root {
            --bg-dark: #0E1013;
            --bg-panel: #15181D;
            --text-primary: #F4F5F1;
            --text-ghost: #9AA0A6;
            --line-dark: #2A2F35;
            --bg-light: #F4F5F1;
            --text-ink: #1A1D20;
            --accent: #C6FF3D;
            --accent-vermilion: #FF4A2D;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-full: 999px;
            --shadow-dark: 0 24px 60px rgba(0, 0, 0, 0.28);
            --shadow-light: 0 12px 30px rgba(20, 20, 20, 0.08);
            --spacing-8: 8px;
            --spacing-16: 16px;
            --spacing-24: 24px;
            --spacing-32: 32px;
            --spacing-48: 48px;
            --spacing-64: 64px;
            --spacing-96: 96px;
            --spacing-120: 120px;
        }
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Inter', sans-serif;
            line-height: 1.85;
            background-color: var(--bg-dark);
            color: var(--text-primary);
            overflow-x: hidden;
            font-size: 16px;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: color 0.25s ease, border-color 0.25s ease;
        }
        button,
        input,
        textarea,
        select {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            background: none;
            color: inherit;
        }
        button {
            cursor: pointer;
        }
        .container {
            max-width: 1360px;
            margin: 0 auto;
            padding: 0 32px;
        }
        .btn-primary {
            background-color: var(--accent);
            color: #0E1013;
            font-weight: 700;
            padding: 14px 32px;
            border-radius: var(--radius-full);
            transition: all 0.25s ease;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 15px;
            letter-spacing: 0.01em;
            line-height: 1.4;
            border: 2px solid var(--accent);
        }
        .btn-primary:hover {
            background-color: #d2ff5e;
            border-color: #d2ff5e;
            transform: translateY(-2px);
            box-shadow: 0 12px 28px rgba(198, 255, 61, 0.22);
        }
        .btn-primary:active {
            transform: scale(0.98);
            box-shadow: none;
        }
        .btn-secondary {
            background: transparent;
            color: var(--text-primary);
            font-weight: 600;
            padding: 12px 20px;
            border-radius: var(--radius-full);
            border: 1.5px solid var(--line-dark);
            transition: all 0.25s ease;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 15px;
            letter-spacing: 0.01em;
            line-height: 1.4;
        }
        .btn-secondary:hover {
            border-color: var(--accent);
            color: var(--accent);
            transform: translateY(-2px);
        }
        .btn-secondary:active {
            transform: scale(0.98);
        }
        .btn-ghost-link {
            background: transparent;
            color: var(--accent);
            font-weight: 600;
            padding: 10px 4px;
            border-bottom: 2px solid var(--accent);
            transition: all 0.25s ease;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 15px;
            letter-spacing: 0.01em;
            line-height: 1.4;
            border-radius: 0;
        }
        .btn-ghost-link:hover {
            color: #d2ff5e;
            border-bottom-width: 3px;
            padding-left: 8px;
        }
        .section-label {
            font-family: 'Roboto Mono', 'Inter', monospace;
            font-size: 13px;
            font-weight: 500;
            letter-spacing: 0.12em;
            text-transform: uppercase;
            color: var(--accent);
            margin-bottom: 12px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .section-label::before {
            content: '';
            width: 24px;
            height: 2px;
            background: var(--accent);
            display: inline-block;
        }
        .section-title {
            font-size: clamp(2rem, 4vw, 3rem);
            font-weight: 800;
            letter-spacing: -0.02em;
            line-height: 1.25;
            margin-bottom: 16px;
            color: var(--text-primary);
        }
        .section-desc {
            font-size: 1.1rem;
            color: var(--text-ghost);
            line-height: 1.9;
            margin-bottom: 40px;
            max-width: 720px;
        }
        .nav-link {
            font-size: 0.92rem;
            font-weight: 500;
            color: var(--text-ghost);
            letter-spacing: 0.02em;
            padding: 6px 0;
            position: relative;
            transition: color 0.25s ease;
            white-space: nowrap;
        }
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--accent);
            transition: width 0.3s ease;
        }
        .nav-link:hover,
        .nav-link.active {
            color: var(--text-primary);
        }
        .nav-link:hover::after,
        .nav-link.active::after {
            width: 100%;
        }
        .nav-link.active::before {
            content: '';
            position: absolute;
            top: 50%;
            left: -16px;
            transform: translateY(-50%);
            width: 6px;
            height: 6px;
            background: var(--accent);
            border-radius: 50%;
        }
        .card-hover {
            transition: all 0.3s ease;
        }
        .card-hover:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-dark);
        }
        .focus-ring:focus-visible {
            outline: 2px solid var(--accent-vermilion);
            outline-offset: 4px;
        }
        .training-banner {
            min-height: 42vh;
            background-image: linear-gradient(rgba(14, 16, 19, 0.78), rgba(14, 16, 19, 0.88)), url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            display: flex;
            align-items: flex-end;
            padding: 64px 0 48px;
            position: relative;
        }
        .training-banner::after {
            content: '';
            position: absolute;
            left: 0;
            right: 0;
            bottom: 0;
            height: 1px;
            background: linear-gradient(90deg, transparent, var(--accent), transparent);
        }
        .breadcrumb {
            font-size: 0.85rem;
            color: var(--text-ghost);
            display: flex;
            align-items: center;
            gap: 8px;
            margin-bottom: 10px;
        }
        .breadcrumb a:hover {
            color: var(--accent);
        }
        .module-index {
            position: sticky;
            top: 90px;
        }
        .module-index a {
            display: block;
            padding: 12px 14px;
            border-left: 2px solid var(--line-dark);
            color: var(--text-ghost);
            font-size: 0.95rem;
            transition: all 0.25s ease;
        }
        .module-index a:hover,
        .module-index a.active {
            border-left-color: var(--accent);
            color: var(--text-primary);
            background: rgba(198, 255, 61, 0.04);
        }
        .data-panel {
            background: var(--bg-panel);
            border: 1px solid var(--line-dark);
            border-radius: var(--radius-md);
            padding: 20px 22px;
        }
        .data-panel .data-number {
            font-family: 'Roboto Mono', 'Inter', monospace;
            font-size: 2.2rem;
            font-weight: 700;
            color: var(--accent);
            line-height: 1;
        }
        .training-step {
            display: flex;
            gap: 20px;
            padding: 18px 0;
            border-bottom: 1px solid var(--line-dark);
        }
        .training-step:last-child {
            border-bottom: none;
        }
        .step-num {
            font-family: 'Roboto Mono', monospace;
            font-size: 1rem;
            color: var(--accent);
            font-weight: 600;
            min-width: 32px;
            padding-top: 4px;
        }
        .case-card {
            background: var(--bg-panel);
            border: 1px solid var(--line-dark);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: all 0.3s ease;
        }
        .case-card:hover {
            border-color: var(--accent);
            transform: translateY(-4px);
            box-shadow: var(--shadow-dark);
        }
        .case-card img {
            height: 200px;
            width: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }
        .case-card:hover img {
            transform: scale(1.04);
        }
        .faq-item {
            border-bottom: 1px solid var(--line-dark);
        }
        .faq-question {
            padding: 18px 6px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            cursor: pointer;
            font-weight: 600;
            font-size: 1rem;
            color: var(--text-primary);
            transition: color 0.2s ease;
            text-align: left;
            width: 100%;
        }
        .faq-question:hover {
            color: var(--accent);
        }
        .faq-icon {
            font-size: 1.2rem;
            color: var(--accent);
            transition: transform 0.3s ease;
            flex-shrink: 0;
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease;
            color: var(--text-ghost);
            padding: 0 6px;
        }
        .faq-item.open .faq-answer {
            max-height: 400px;
            padding-bottom: 18px;
        }
        .faq-item.open .faq-icon {
            transform: rotate(45deg);
        }
        .mobile-menu {
            position: fixed;
            inset: 0;
            background: rgba(14, 16, 19, 0.98);
            z-index: 90;
            display: flex;
            flex-direction: column;
            padding: 32px;
            transform: translateX(100%);
            transition: transform 0.3s ease;
        }
        .mobile-menu.open {
            transform: translateX(0);
        }
        .mobile-menu a {
            font-size: 1.3rem;
            padding: 14px 0;
            border-bottom: 1px solid var(--line-dark);
            color: var(--text-primary);
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .mobile-menu a:hover {
            color: var(--accent);
        }
        @media (max-width: 768px) {
            .container {
                padding: 0 20px;
            }
            .training-banner {
                min-height: 36vh;
                padding: 48px 0 32px;
            }
            .section-title {
                font-size: 1.8rem;
            }
            .section-desc {
                font-size: 1rem;
            }
            .training-step {
                flex-direction: column;
                gap: 8px;
            }
        }

/* roulang page: category1 */
:root {
            --bg-dark: #0E1013;
            --bg-panel: #15181D;
            --text-primary: #F4F5F1;
            --text-ghost: #9AA0A6;
            --line-dark: #2A2F35;
            --bg-light: #F4F5F1;
            --text-ink: #1A1D20;
            --accent: #C6FF3D;
            --accent-vermilion: #FF4A2D;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-full: 999px;
            --shadow-dark: 0 24px 60px rgba(0, 0, 0, 0.28);
            --shadow-light: 0 12px 30px rgba(20, 20, 20, 0.08);
            --spacing-8: 8px;
            --spacing-16: 16px;
            --spacing-24: 24px;
            --spacing-32: 32px;
            --spacing-48: 48px;
            --spacing-64: 64px;
            --spacing-96: 96px;
            --spacing-120: 120px;
        }

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

        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Inter', sans-serif;
            line-height: 1.85;
            background-color: var(--bg-dark);
            color: var(--text-primary);
            overflow-x: hidden;
            font-size: 16px;
        }

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

        a {
            color: inherit;
            text-decoration: none;
            transition: color 0.25s ease, border-color 0.25s ease;
        }

        button,
        input,
        textarea,
        select {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            background: none;
            color: inherit;
        }

        button {
            cursor: pointer;
        }

        .container {
            max-width: 1360px;
            margin: 0 auto;
            padding: 0 32px;
        }

        .btn-primary {
            background-color: var(--accent);
            color: #0E1013;
            font-weight: 700;
            padding: 14px 32px;
            border-radius: var(--radius-full);
            transition: all 0.25s ease;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 15px;
            letter-spacing: 0.01em;
            line-height: 1.4;
            border: 2px solid var(--accent);
        }
        .btn-primary:hover {
            background-color: #d2ff5e;
            border-color: #d2ff5e;
            transform: translateY(-2px);
            box-shadow: 0 12px 28px rgba(198, 255, 61, 0.22);
        }
        .btn-primary:active {
            transform: scale(0.98);
            box-shadow: none;
        }

        .btn-secondary {
            background: transparent;
            color: var(--text-primary);
            font-weight: 600;
            padding: 12px 20px;
            border-radius: var(--radius-full);
            border: 1.5px solid var(--line-dark);
            transition: all 0.25s ease;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 15px;
            letter-spacing: 0.01em;
            line-height: 1.4;
        }
        .btn-secondary:hover {
            border-color: var(--accent);
            color: var(--accent);
            transform: translateY(-2px);
        }
        .btn-secondary:active {
            transform: scale(0.98);
        }

        .btn-ghost-link {
            background: transparent;
            color: var(--accent);
            font-weight: 600;
            padding: 10px 4px;
            border-bottom: 2px solid var(--accent);
            transition: all 0.25s ease;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 15px;
            letter-spacing: 0.01em;
            line-height: 1.4;
            border-radius: 0;
        }
        .btn-ghost-link:hover {
            color: #d2ff5e;
            border-bottom-width: 3px;
            padding-left: 8px;
        }

        .section-label {
            font-family: 'Roboto Mono', 'Inter', monospace;
            font-size: 13px;
            font-weight: 500;
            letter-spacing: 0.12em;
            text-transform: uppercase;
            color: var(--accent);
            margin-bottom: 12px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .section-label::before {
            content: '';
            width: 24px;
            height: 2px;
            background: var(--accent);
            display: inline-block;
        }

        .section-title {
            font-size: clamp(2rem, 4vw, 3rem);
            font-weight: 800;
            letter-spacing: -0.02em;
            line-height: 1.25;
            margin-bottom: 16px;
            color: var(--text-primary);
        }

        .section-desc {
            font-size: 1.1rem;
            color: var(--text-ghost);
            line-height: 1.9;
            margin-bottom: 40px;
            max-width: 720px;
        }

        .nav-link {
            font-size: 0.92rem;
            font-weight: 500;
            color: var(--text-ghost);
            letter-spacing: 0.02em;
            padding: 6px 0;
            position: relative;
            transition: color 0.25s ease;
            white-space: nowrap;
        }
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--accent);
            transition: width 0.3s ease;
        }
        .nav-link:hover,
        .nav-link.active {
            color: var(--text-primary);
        }
        .nav-link:hover::after,
        .nav-link.active::after {
            width: 100%;
        }
        .nav-link.active::before {
            content: '';
            position: absolute;
            top: 50%;
            left: -16px;
            transform: translateY(-50%);
            width: 6px;
            height: 6px;
            background: var(--accent);
            border-radius: 50%;
        }

        .card-hover {
            transition: all 0.3s ease;
        }
        .card-hover:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-dark);
        }

        .focus-ring:focus-visible {
            outline: 2px solid var(--accent-vermilion);
            outline-offset: 2px;
        }

        .sticky-index a {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 12px 16px;
            border-left: 2px solid var(--line-dark);
            color: var(--text-ghost);
            font-size: 0.9rem;
            transition: all 0.25s ease;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
        }
        .sticky-index a:hover,
        .sticky-index a.active-index {
            border-left-color: var(--accent);
            color: var(--text-primary);
            background: rgba(198, 255, 61, 0.06);
        }
        .sticky-index a.active-index {
            color: var(--accent);
        }
        .sticky-index .index-num {
            font-family: 'Roboto Mono', monospace;
            font-size: 0.75rem;
            color: var(--accent);
            opacity: 0.7;
        }

        .data-block {
            background: var(--bg-panel);
            border: 1px solid var(--line-dark);
            border-radius: var(--radius-md);
            padding: 28px;
            transition: all 0.3s ease;
        }
        .data-block:hover {
            border-color: var(--accent);
            transform: translateY(-3px);
            box-shadow: var(--shadow-dark);
        }
        .data-num {
            font-family: 'Roboto Mono', monospace;
            font-size: 2rem;
            font-weight: 700;
            color: var(--accent);
            letter-spacing: -0.03em;
            line-height: 1.2;
        }
        .data-unit {
            font-size: 0.85rem;
            color: var(--text-ghost);
            margin-left: 4px;
        }

        .module-block {
            border: 1px solid var(--line-dark);
            border-radius: var(--radius-md);
            padding: 32px;
            margin-bottom: 28px;
            background: var(--bg-panel);
            transition: all 0.3s ease;
        }
        .module-block:hover {
            border-color: rgba(198, 255, 61, 0.4);
            box-shadow: var(--shadow-dark);
        }

        .breadcrumb-link {
            color: var(--text-ghost);
            font-size: 0.85rem;
            transition: color 0.25s ease;
        }
        .breadcrumb-link:hover {
            color: var(--accent);
        }

        .faq-item {
            border-bottom: 1px solid var(--line-dark);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 20px 0;
            cursor: pointer;
            font-weight: 600;
            font-size: 1.05rem;
            color: var(--text-primary);
            transition: color 0.25s ease;
            gap: 16px;
            text-align: left;
            width: 100%;
        }
        .faq-question:hover {
            color: var(--accent);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease;
            color: var(--text-ghost);
            font-size: 0.95rem;
            line-height: 1.85;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding-bottom: 20px;
        }
        .faq-item.open .faq-question i {
            transform: rotate(45deg);
            color: var(--accent);
        }
        .faq-question i {
            transition: transform 0.3s ease;
            color: var(--text-ghost);
            flex-shrink: 0;
        }

        .page-hero {
            min-height: 42vh;
            display: flex;
            align-items: flex-end;
            background-image: url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            position: relative;
            padding: 80px 0 48px;
        }
        .page-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(14,16,19,0.72) 0%, rgba(14,16,19,0.88) 100%);
            z-index: 1;
        }
        .page-hero .container {
            position: relative;
            z-index: 2;
        }

        .grid-pattern {
            background-image: linear-gradient(rgba(198, 255, 61, 0.04) 1px, transparent 1px),
                linear-gradient(90deg, rgba(198, 255, 61, 0.04) 1px, transparent 1px);
            background-size: 48px 48px;
        }

        .tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 0.75rem;
            font-weight: 500;
            padding: 4px 12px;
            border-radius: var(--radius-full);
            background: rgba(198, 255, 61, 0.1);
            color: var(--accent);
            border: 1px solid rgba(198, 255, 61, 0.25);
            letter-spacing: 0.04em;
        }

        .highlight-vermilion {
            color: var(--accent-vermilion);
        }

        .mobile-menu {
            display: none;
            background: var(--bg-dark);
            border-bottom: 1px solid var(--line-dark);
            padding: 16px 0;
        }
        .mobile-menu.open {
            display: block;
        }

        @media (max-width: 1024px) {
            .container {
                padding: 0 24px;
            }
            .sticky-index {
                position: static !important;
                top: auto !important;
                display: flex;
                flex-wrap: wrap;
                gap: 8px;
                margin-bottom: 32px;
            }
            .sticky-index a {
                border-left: 1px solid var(--line-dark);
                border-radius: var(--radius-full);
                padding: 8px 16px;
                font-size: 0.8rem;
            }
        }

        @media (max-width: 768px) {
            .container {
                padding: 0 20px;
            }
            .page-hero {
                min-height: 36vh;
                padding: 60px 0 32px;
            }
            .section-title {
                font-size: 1.75rem;
            }
            .module-block {
                padding: 20px;
            }
            .data-block {
                padding: 20px;
            }
            .data-num {
                font-size: 1.5rem;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .page-hero {
                min-height: 32vh;
                padding: 48px 0 24px;
            }
            .btn-primary,
            .btn-secondary {
                padding: 10px 20px;
                font-size: 0.85rem;
            }
        }

/* roulang page: category2 */
:root {
            --bg-dark: #0E1013;
            --bg-panel: #15181D;
            --text-primary: #F4F5F1;
            --text-ghost: #9AA0A6;
            --line-dark: #2A2F35;
            --bg-light: #F4F5F1;
            --text-ink: #1A1D20;
            --accent: #C6FF3D;
            --accent-vermilion: #FF4A2D;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-full: 999px;
            --shadow-dark: 0 24px 60px rgba(0, 0, 0, 0.28);
            --shadow-light: 0 12px 30px rgba(20, 20, 20, 0.08);
            --spacing-8: 8px;
            --spacing-16: 16px;
            --spacing-24: 24px;
            --spacing-32: 32px;
            --spacing-48: 48px;
            --spacing-64: 64px;
            --spacing-96: 96px;
            --spacing-120: 120px;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Inter', sans-serif;
            line-height: 1.85;
            background-color: var(--bg-dark);
            color: var(--text-primary);
            overflow-x: hidden;
            font-size: 16px;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: color 0.25s ease, border-color 0.25s ease, background-color 0.25s ease;
        }
        button, input, textarea, select {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            background: none;
            color: inherit;
        }
        button {
            cursor: pointer;
        }
        .container {
            max-width: 1360px;
            margin: 0 auto;
            padding: 0 32px;
        }
        .btn-primary {
            background-color: var(--accent);
            color: #0E1013;
            font-weight: 700;
            padding: 14px 32px;
            border-radius: var(--radius-full);
            transition: all 0.25s ease;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 15px;
            letter-spacing: 0.01em;
            line-height: 1.4;
            border: 2px solid var(--accent);
        }
        .btn-primary:hover {
            background-color: #d2ff5e;
            border-color: #d2ff5e;
            transform: translateY(-2px);
            box-shadow: 0 12px 28px rgba(198, 255, 61, 0.22);
        }
        .btn-primary:active {
            transform: scale(0.98);
            box-shadow: none;
        }
        .btn-secondary {
            background: transparent;
            color: var(--text-primary);
            font-weight: 600;
            padding: 12px 20px;
            border-radius: var(--radius-full);
            border: 1.5px solid var(--line-dark);
            transition: all 0.25s ease;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 15px;
            letter-spacing: 0.01em;
            line-height: 1.4;
        }
        .btn-secondary:hover {
            border-color: var(--accent);
            color: var(--accent);
            transform: translateY(-2px);
        }
        .btn-secondary:active {
            transform: scale(0.98);
        }
        .btn-ghost-link {
            background: transparent;
            color: var(--accent);
            font-weight: 600;
            padding: 10px 4px;
            border-bottom: 2px solid var(--accent);
            transition: all 0.25s ease;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 15px;
            letter-spacing: 0.01em;
            line-height: 1.4;
            border-radius: 0;
        }
        .btn-ghost-link:hover {
            color: #d2ff5e;
            border-bottom-width: 3px;
            padding-left: 8px;
        }
        .section-label {
            font-family: 'Roboto Mono', 'Inter', monospace;
            font-size: 13px;
            font-weight: 500;
            letter-spacing: 0.12em;
            text-transform: uppercase;
            color: var(--accent);
            margin-bottom: 12px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .section-label::before {
            content: '';
            width: 24px;
            height: 2px;
            background: var(--accent);
            display: inline-block;
        }
        .section-title {
            font-size: clamp(2rem, 4vw, 3rem);
            font-weight: 800;
            letter-spacing: -0.02em;
            line-height: 1.25;
            margin-bottom: 16px;
            color: var(--text-primary);
        }
        .section-desc {
            font-size: 1.1rem;
            color: var(--text-ghost);
            line-height: 1.9;
            margin-bottom: 40px;
            max-width: 720px;
        }
        .nav-link {
            font-size: 0.92rem;
            font-weight: 500;
            color: var(--text-ghost);
            letter-spacing: 0.02em;
            padding: 6px 0;
            position: relative;
            transition: color 0.25s ease;
            white-space: nowrap;
        }
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--accent);
            transition: width 0.3s ease;
        }
        .nav-link:hover,
        .nav-link.active {
            color: var(--text-primary);
        }
        .nav-link:hover::after,
        .nav-link.active::after {
            width: 100%;
        }
        .nav-link.active::before {
            content: '';
            position: absolute;
            top: 50%;
            left: -16px;
            transform: translateY(-50%);
            width: 6px;
            height: 6px;
            background: var(--accent);
            border-radius: 50%;
        }
        .card-hover {
            transition: all 0.3s ease;
        }
        .card-hover:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-dark);
        }
        .focus-ring:focus-visible {
            outline: 2px solid var(--accent-vermilion);
            outline-offset: 3px;
            border-radius: 4px;
        }
        .breadcrumb-link {
            font-size: 0.82rem;
            color: var(--text-ghost);
            letter-spacing: 0.03em;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: color 0.25s ease;
        }
        .breadcrumb-link:hover {
            color: var(--accent);
        }
        .breadcrumb-separator {
            font-size: 0.82rem;
            color: var(--line-dark);
            margin: 0 8px;
        }
        .scene-bg {
            position: relative;
            overflow: hidden;
            background-size: cover;
            background-position: center;
            min-height: 520px;
        }
        .scene-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(14,16,19,0.72) 0%, rgba(14,16,19,0.88) 55%, rgba(14,16,19,0.95) 100%);
            z-index: 1;
        }
        .scene-content {
            position: relative;
            z-index: 2;
        }
        .data-panel {
            background: rgba(21,24,29,0.85);
            border: 1px solid var(--line-dark);
            border-radius: var(--radius-md);
            padding: 28px 24px;
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
        }
        .stat-number {
            font-family: 'Roboto Mono', 'Inter', monospace;
            font-weight: 700;
            font-size: clamp(1.8rem, 3vw, 2.6rem);
            letter-spacing: -0.01em;
            line-height: 1.2;
            color: var(--accent);
        }
        .stat-label {
            font-size: 0.8rem;
            color: var(--text-ghost);
            letter-spacing: 0.05em;
            margin-top: 4px;
        }
        .faq-item {
            border-bottom: 1.5px solid var(--line-dark);
            transition: background-color 0.3s ease;
        }
        .faq-item.active {
            background: rgba(21,24,29,0.6);
        }
        .faq-question {
            width: 100%;
            text-align: left;
            padding: 20px 0;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            font-weight: 600;
            font-size: 1rem;
            letter-spacing: 0.01em;
            color: var(--text-primary);
            transition: color 0.25s ease;
        }
        .faq-question:hover {
            color: var(--accent);
        }
        .faq-icon {
            flex-shrink: 0;
            width: 32px;
            height: 32px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            border: 1.5px solid var(--line-dark);
            font-size: 0.85rem;
            color: var(--text-ghost);
            transition: all 0.3s ease;
        }
        .faq-item.active .faq-icon {
            border-color: var(--accent);
            color: var(--accent);
            transform: rotate(45deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
            padding: 0;
            color: var(--text-ghost);
            font-size: 0.95rem;
            line-height: 1.85;
        }
        .faq-item.active .faq-answer {
            max-height: 500px;
            padding: 0 0 24px 0;
        }
        .explosion-badge {
            background: var(--accent-vermilion);
            color: #fff;
            font-weight: 800;
            padding: 8px 16px;
            border-radius: var(--radius-full);
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 0.75rem;
            letter-spacing: 0.08em;
            box-shadow: 0 8px 24px rgba(255,74,45,0.35);
            animation: pulseBadge 2.4s ease-in-out infinite;
        }
        @keyframes pulseBadge {
            0%, 100% { transform: scale(1); }
            50% { transform: scale(1.05); }
        }
        .timeline-dot {
            width: 8px;
            height: 8px;
            background: var(--accent);
            border-radius: 50%;
            flex-shrink: 0;
            margin-top: 8px;
        }
        .timeline-line {
            width: 2px;
            background: var(--line-dark);
            flex-grow: 1;
            margin: 0 12px;
        }
        .scene-index {
            font-family: 'Roboto Mono', 'Inter', monospace;
            font-weight: 700;
            font-size: 1rem;
            color: var(--accent);
            letter-spacing: 0.04em;
        }
        .mobile-menu {
            display: none;
            background: var(--bg-panel);
            border-top: 1px solid var(--line-dark);
            padding: 24px 32px;
            flex-direction: column;
            gap: 4px;
        }
        .mobile-menu.open {
            display: flex;
        }
        .mobile-menu a {
            font-size: 1.2rem;
            font-weight: 600;
            color: var(--text-primary);
            padding: 12px 0;
            border-bottom: 1px solid var(--line-dark);
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .mobile-menu a span:last-child {
            font-size: 0.75rem;
            color: var(--text-ghost);
            font-family: 'Roboto Mono', monospace;
        }
        @media (max-width: 1024px) {
            .container {
                padding: 0 24px;
            }
            .scene-bg {
                min-height: auto;
                padding: 60px 0;
            }
            .data-panel {
                padding: 20px 16px;
            }
        }
        @media (max-width: 768px) {
            .container {
                padding: 0 20px;
            }
            .section-title {
                font-size: 1.8rem;
            }
            .section-desc {
                font-size: 1rem;
            }
            .scene-bg {
                padding: 48px 0;
            }
            .stat-number {
                font-size: 1.6rem;
            }
            .btn-primary {
                padding: 12px 24px;
                font-size: 14px;
            }
            .btn-secondary {
                padding: 10px 16px;
                font-size: 14px;
            }
            .mobile-menu {
                padding: 16px 20px;
            }
            .mobile-menu a {
                font-size: 1.1rem;
                padding: 10px 0;
            }
        }
        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .section-title {
                font-size: 1.5rem;
                line-height: 1.35;
            }
            .scene-bg {
                padding: 36px 0;
            }
            .explosion-badge {
                font-size: 0.7rem;
                padding: 6px 12px;
            }
        }

/* roulang page: category5 */
:root {
            --bg-dark: #0E1013;
            --bg-panel: #15181D;
            --text-primary: #F4F5F1;
            --text-ghost: #9AA0A6;
            --line-dark: #2A2F35;
            --bg-light: #F4F5F1;
            --text-ink: #1A1D20;
            --accent: #C6FF3D;
            --accent-vermilion: #FF4A2D;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-full: 999px;
            --shadow-dark: 0 24px 60px rgba(0, 0, 0, 0.28);
            --shadow-light: 0 12px 30px rgba(20, 20, 20, 0.08);
            --spacing-8: 8px;
            --spacing-16: 16px;
            --spacing-24: 24px;
            --spacing-32: 32px;
            --spacing-48: 48px;
            --spacing-64: 64px;
            --spacing-96: 96px;
            --spacing-120: 120px;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Inter', sans-serif;
            line-height: 1.85;
            background-color: var(--bg-dark);
            color: var(--text-primary);
            overflow-x: hidden;
            font-size: 16px;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: color 0.25s ease, border-color 0.25s ease;
        }
        button, input, textarea, select {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            background: none;
            color: inherit;
        }
        button { cursor: pointer; }
        .container {
            max-width: 1360px;
            margin: 0 auto;
            padding: 0 32px;
        }
        .btn-primary {
            background-color: var(--accent);
            color: #0E1013;
            font-weight: 700;
            padding: 14px 32px;
            border-radius: var(--radius-full);
            transition: all 0.25s ease;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 15px;
            letter-spacing: 0.01em;
            line-height: 1.4;
            border: 2px solid var(--accent);
        }
        .btn-primary:hover {
            background-color: #d2ff5e;
            border-color: #d2ff5e;
            transform: translateY(-2px);
            box-shadow: 0 12px 28px rgba(198, 255, 61, 0.22);
        }
        .btn-primary:active {
            transform: scale(0.98);
            box-shadow: none;
        }
        .btn-secondary {
            background: transparent;
            color: var(--text-primary);
            font-weight: 600;
            padding: 12px 20px;
            border-radius: var(--radius-full);
            border: 1.5px solid var(--line-dark);
            transition: all 0.25s ease;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 15px;
            letter-spacing: 0.01em;
            line-height: 1.4;
        }
        .btn-secondary:hover {
            border-color: var(--accent);
            color: var(--accent);
            transform: translateY(-2px);
        }
        .btn-secondary:active { transform: scale(0.98); }
        .btn-ghost-link {
            background: transparent;
            color: var(--accent);
            font-weight: 600;
            padding: 10px 4px;
            border-bottom: 2px solid var(--accent);
            transition: all 0.25s ease;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 15px;
            letter-spacing: 0.01em;
            line-height: 1.4;
            border-radius: 0;
        }
        .btn-ghost-link:hover {
            color: #d2ff5e;
            border-bottom-width: 3px;
            padding-left: 8px;
        }
        .section-label {
            font-family: 'Roboto Mono', 'Inter', monospace;
            font-size: 13px;
            font-weight: 500;
            letter-spacing: 0.12em;
            text-transform: uppercase;
            color: var(--accent);
            margin-bottom: 12px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .section-label::before {
            content: '';
            width: 24px;
            height: 2px;
            background: var(--accent);
            display: inline-block;
        }
        .section-title {
            font-size: clamp(2rem, 4vw, 3rem);
            font-weight: 800;
            letter-spacing: -0.02em;
            line-height: 1.25;
            margin-bottom: 16px;
            color: var(--text-primary);
        }
        .section-desc {
            font-size: 1.1rem;
            color: var(--text-ghost);
            line-height: 1.9;
            margin-bottom: 40px;
            max-width: 720px;
        }
        .nav-link {
            font-size: 0.92rem;
            font-weight: 500;
            color: var(--text-ghost);
            letter-spacing: 0.02em;
            padding: 6px 0;
            position: relative;
            transition: color 0.25s ease;
            white-space: nowrap;
        }
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--accent);
            transition: width 0.3s ease;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--text-primary);
        }
        .nav-link:hover::after, .nav-link.active::after { width: 100%; }
        .nav-link.active::before {
            content: '';
            position: absolute;
            top: 50%;
            left: -16px;
            transform: translateY(-50%);
            width: 6px;
            height: 6px;
            background: var(--accent);
            border-radius: 50%;
        }
        .card-hover {
            transition: all 0.3s ease;
        }
        .card-hover:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-dark);
        }
        .news-card {
            background: var(--bg-panel);
            border: 1px solid var(--line-dark);
            border-radius: var(--radius-md);
            transition: all 0.35s ease;
            overflow: hidden;
        }
        .news-card:hover {
            border-color: var(--accent);
            transform: translateY(-4px);
            box-shadow: var(--shadow-dark);
        }
        .news-card .news-meta {
            font-family: 'Roboto Mono', 'Inter', monospace;
            font-size: 0.75rem;
            letter-spacing: 0.04em;
            color: var(--text-ghost);
        }
        .news-card .news-title {
            font-size: 1.25rem;
            font-weight: 700;
            letter-spacing: -0.01em;
            line-height: 1.45;
            color: var(--text-primary);
            transition: color 0.25s ease;
        }
        .news-card:hover .news-title { color: var(--accent); }
        .news-card .news-summary {
            font-size: 0.95rem;
            color: var(--text-ghost);
            line-height: 1.85;
        }
        .news-tag {
            display: inline-block;
            padding: 4px 12px;
            border-radius: var(--radius-full);
            font-size: 0.7rem;
            font-weight: 600;
            letter-spacing: 0.06em;
            text-transform: uppercase;
            background: rgba(198, 255, 61, 0.1);
            color: var(--accent);
            border: 1px solid rgba(198, 255, 61, 0.25);
        }
        .news-tag.vermilion {
            background: rgba(255, 74, 45, 0.1);
            color: var(--accent-vermilion);
            border: 1px solid rgba(255, 74, 45, 0.25);
        }
        .banner-bg {
            background-image: url('/assets/images/backpic/back-3.webp');
            background-size: cover;
            background-position: center;
            position: relative;
        }
        .banner-bg::before {
            content: '';
            position: absolute;
            inset: 0;
            background: rgba(14, 16, 19, 0.78);
            z-index: 1;
        }
        .banner-content { position: relative; z-index: 2; }
        .date-badge {
            font-family: 'Roboto Mono', 'Inter', monospace;
            font-size: 0.78rem;
            letter-spacing: 0.06em;
            color: var(--text-ghost);
            background: rgba(20, 20, 20, 0.5);
            padding: 6px 14px;
            border-radius: var(--radius-full);
            border: 1px solid var(--line-dark);
        }
        .breadcrumb-item {
            font-size: 0.85rem;
            color: var(--text-ghost);
            transition: color 0.25s ease;
        }
        .breadcrumb-item:hover { color: var(--accent); }
        .breadcrumb-sep {
            color: var(--text-ghost);
            font-size: 0.7rem;
            margin: 0 8px;
        }
        .filter-chip {
            padding: 8px 18px;
            border-radius: var(--radius-full);
            font-size: 0.82rem;
            font-weight: 600;
            color: var(--text-ghost);
            border: 1px solid var(--line-dark);
            transition: all 0.25s ease;
            white-space: nowrap;
        }
        .filter-chip:hover, .filter-chip.active {
            background: var(--accent);
            color: #0E1013;
            border-color: var(--accent);
        }
        .timeline-dot {
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: var(--accent);
            flex-shrink: 0;
            margin-top: 6px;
            box-shadow: 0 0 0 4px rgba(198, 255, 61, 0.15);
        }
        .timeline-line {
            width: 1px;
            background: var(--line-dark);
            flex: 1;
            margin-left: 5px;
        }
        .pagination-btn {
            width: 40px;
            height: 40px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--line-dark);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.9rem;
            color: var(--text-ghost);
            transition: all 0.25s ease;
        }
        .pagination-btn:hover, .pagination-btn.active {
            background: var(--accent);
            color: #0E1013;
            border-color: var(--accent);
        }
        .faq-item {
            border-bottom: 1px solid var(--line-dark);
        }
        .faq-item:last-child { border-bottom: none; }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 20px 0;
            cursor: pointer;
            transition: color 0.25s ease;
            font-weight: 700;
            font-size: 1.05rem;
        }
        .faq-question:hover { color: var(--accent); }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
            color: var(--text-ghost);
            font-size: 0.95rem;
            line-height: 1.9;
        }
        .faq-answer.open {
            max-height: 300px;
            padding: 0 0 20px 0;
        }
        .faq-icon {
            font-size: 1.2rem;
            color: var(--accent);
            transition: transform 0.3s ease;
            flex-shrink: 0;
        }
        .faq-question.active .faq-icon { transform: rotate(45deg); }

        @media (max-width: 1024px) {
            .container { padding: 0 24px; }
        }
        @media (max-width: 768px) {
            .container { padding: 0 16px; }
            .section-title { font-size: 1.8rem; }
            .section-desc { font-size: 1rem; }
            .news-card .news-title { font-size: 1.1rem; }
        }
        @media (max-width: 520px) {
            .container { padding: 0 12px; }
            .section-title { font-size: 1.5rem; }
            .filter-chip { padding: 6px 12px; font-size: 0.75rem; }
        }

/* roulang page: category4 */
:root {
            --bg-dark: #0E1013;
            --bg-panel: #15181D;
            --text-primary: #F4F5F1;
            --text-ghost: #9AA0A6;
            --line-dark: #2A2F35;
            --bg-light: #F4F5F1;
            --text-ink: #1A1D20;
            --accent: #C6FF3D;
            --accent-vermilion: #FF4A2D;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-full: 999px;
            --shadow-dark: 0 24px 60px rgba(0, 0, 0, 0.28);
            --shadow-light: 0 12px 30px rgba(20, 20, 20, 0.08);
            --spacing-8: 8px;
            --spacing-16: 16px;
            --spacing-24: 24px;
            --spacing-32: 32px;
            --spacing-48: 48px;
            --spacing-64: 64px;
            --spacing-96: 96px;
            --spacing-120: 120px;
        }

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

        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Inter', sans-serif;
            line-height: 1.85;
            background-color: var(--bg-dark);
            color: var(--text-primary);
            overflow-x: hidden;
            font-size: 16px;
        }

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

        a {
            color: inherit;
            text-decoration: none;
            transition: color 0.25s ease, border-color 0.25s ease;
        }

        button,
        input,
        textarea,
        select {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            background: none;
            color: inherit;
        }

        button {
            cursor: pointer;
        }

        .container {
            max-width: 1360px;
            margin: 0 auto;
            padding: 0 32px;
        }

        .btn-primary {
            background-color: var(--accent);
            color: #0E1013;
            font-weight: 700;
            padding: 14px 32px;
            border-radius: var(--radius-full);
            transition: all 0.25s ease;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 15px;
            letter-spacing: 0.01em;
            line-height: 1.4;
            border: 2px solid var(--accent);
        }

        .btn-primary:hover {
            background-color: #d2ff5e;
            border-color: #d2ff5e;
            transform: translateY(-2px);
            box-shadow: 0 12px 28px rgba(198, 255, 61, 0.22);
        }

        .btn-primary:active {
            transform: scale(0.98);
            box-shadow: none;
        }

        .btn-secondary {
            background: transparent;
            color: var(--text-primary);
            font-weight: 600;
            padding: 12px 20px;
            border-radius: var(--radius-full);
            border: 1.5px solid var(--line-dark);
            transition: all 0.25s ease;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 15px;
            letter-spacing: 0.01em;
            line-height: 1.4;
        }

        .btn-secondary:hover {
            border-color: var(--accent);
            color: var(--accent);
            transform: translateY(-2px);
        }

        .btn-secondary:active {
            transform: scale(0.98);
        }

        .btn-ghost-link {
            background: transparent;
            color: var(--accent);
            font-weight: 600;
            padding: 10px 4px;
            border-bottom: 2px solid var(--accent);
            transition: all 0.25s ease;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 15px;
            letter-spacing: 0.01em;
            line-height: 1.4;
            border-radius: 0;
        }

        .btn-ghost-link:hover {
            color: #d2ff5e;
            border-bottom-width: 3px;
            padding-left: 8px;
        }

        .section-label {
            font-family: 'Roboto Mono', 'Inter', monospace;
            font-size: 13px;
            font-weight: 500;
            letter-spacing: 0.12em;
            text-transform: uppercase;
            color: var(--accent);
            margin-bottom: 12px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .section-label::before {
            content: '';
            width: 24px;
            height: 2px;
            background: var(--accent);
            display: inline-block;
        }

        .section-title {
            font-size: clamp(2rem, 4vw, 3rem);
            font-weight: 800;
            letter-spacing: -0.02em;
            line-height: 1.25;
            margin-bottom: 16px;
            color: var(--text-primary);
        }

        .section-desc {
            font-size: 1.1rem;
            color: var(--text-ghost);
            line-height: 1.9;
            margin-bottom: 40px;
            max-width: 720px;
        }

        .nav-link {
            font-size: 0.92rem;
            font-weight: 500;
            color: var(--text-ghost);
            letter-spacing: 0.02em;
            padding: 6px 0;
            position: relative;
            transition: color 0.25s ease;
            white-space: nowrap;
        }

        .nav-link::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--accent);
            transition: width 0.3s ease;
        }

        .nav-link:hover,
        .nav-link.active {
            color: var(--text-primary);
        }

        .nav-link:hover::after,
        .nav-link.active::after {
            width: 100%;
        }

        .nav-link.active::before {
            content: '';
            position: absolute;
            top: 50%;
            left: -16px;
            transform: translateY(-50%);
            width: 6px;
            height: 6px;
            background: var(--accent);
            border-radius: 50%;
        }

        .card-hover {
            transition: all 0.3s ease;
        }

        .card-hover:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-dark);
        }

        .focus-ring:focus-visible {
            outline: 2px solid var(--accent-vermilion);
            outline-offset: 3px;
            border-radius: 4px;
        }

        .price-card {
            border: 1px solid var(--line-dark);
            border-radius: var(--radius-md);
            background: var(--bg-panel);
            padding: 32px 28px;
            transition: all 0.3s ease;
            position: relative;
            display: flex;
            flex-direction: column;
        }

        .price-card:hover {
            border-color: var(--accent);
            transform: translateY(-4px);
            box-shadow: var(--shadow-dark);
        }

        .price-card.highlight {
            border-color: var(--accent);
            box-shadow: 0 0 0 1px var(--accent), 0 24px 60px rgba(0, 0, 0, 0.35);
            background: linear-gradient(180deg, #1a1e14 0%, #15181D 100%);
        }

        .price-card .price-value {
            font-size: 3rem;
            font-weight: 800;
            letter-spacing: -0.03em;
            color: var(--text-primary);
            line-height: 1.1;
            font-family: 'Roboto Mono', 'Inter', monospace;
        }

        .price-card .price-unit {
            font-size: 0.95rem;
            color: var(--text-ghost);
            font-weight: 500;
        }

        .price-table {
            width: 100%;
            border-collapse: collapse;
            min-width: 800px;
        }

        .price-table th {
            background: var(--bg-panel);
            padding: 18px 16px;
            text-align: left;
            font-size: 0.9rem;
            font-weight: 700;
            color: var(--text-primary);
            border-bottom: 1px solid var(--line-dark);
            letter-spacing: 0.02em;
            white-space: nowrap;
        }

        .price-table td {
            padding: 14px 16px;
            border-bottom: 1px solid var(--line-dark);
            font-size: 0.9rem;
            color: var(--text-ghost);
            vertical-align: top;
        }

        .price-table td:first-child {
            color: var(--text-primary);
            font-weight: 600;
            white-space: nowrap;
        }

        .price-table tr:last-child td {
            border-bottom: none;
        }

        .price-table .check {
            color: var(--accent);
            font-weight: 700;
        }

        .price-table .cross {
            color: #5c6269;
        }

        .price-table .thead-highlight {
            background: rgba(198, 255, 61, 0.08);
            border-bottom: 2px solid var(--accent);
        }

        .price-scroll-wrap {
            overflow-x: auto;
            border: 1px solid var(--line-dark);
            border-radius: var(--radius-md);
            background: #101317;
            -webkit-overflow-scrolling: touch;
            scrollbar-width: thin;
            scrollbar-color: var(--line-dark) transparent;
        }

        .price-scroll-wrap::-webkit-scrollbar {
            height: 6px;
        }

        .price-scroll-wrap::-webkit-scrollbar-track {
            background: transparent;
        }

        .price-scroll-wrap::-webkit-scrollbar-thumb {
            background: var(--line-dark);
            border-radius: 999px;
        }

        .faq-item {
            border-bottom: 1px solid var(--line-dark);
        }

        .faq-item:last-child {
            border-bottom: none;
        }

        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 20px 4px;
            text-align: left;
            font-weight: 600;
            font-size: 1rem;
            color: var(--text-primary);
            transition: color 0.25s ease;
            letter-spacing: 0.01em;
        }

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

        .faq-question .faq-icon {
            flex-shrink: 0;
            width: 32px;
            height: 32px;
            border-radius: 50%;
            border: 1px solid var(--line-dark);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.85rem;
            color: var(--text-ghost);
            transition: all 0.3s ease;
        }

        .faq-question.active .faq-icon {
            border-color: var(--accent);
            color: var(--accent);
            transform: rotate(45deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
            padding: 0 4px;
            color: var(--text-ghost);
            font-size: 0.95rem;
            line-height: 1.85;
        }

        .faq-answer.open {
            max-height: 600px;
            padding: 0 4px 24px 4px;
        }

        .banner-bg {
            background-image: url('/assets/images/backpic/back-3.webp');
            background-size: cover;
            background-position: center;
            position: relative;
        }

        .banner-bg::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(14, 16, 19, 0.88) 0%, rgba(14, 16, 19, 0.72) 100%);
        }

        .banner-content {
            position: relative;
            z-index: 1;
        }

        .breadcrumb-separator {
            color: #5c6269;
            font-size: 0.8rem;
            margin: 0 6px;
        }

        .stat-number {
            font-family: 'Roboto Mono', 'Inter', monospace;
            font-weight: 800;
            font-size: 2.5rem;
            letter-spacing: -0.03em;
            color: var(--accent);
            line-height: 1.2;
        }

        .badge-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 0.75rem;
            font-weight: 600;
            padding: 4px 12px;
            border-radius: var(--radius-full);
            background: rgba(198, 255, 61, 0.1);
            color: var(--accent);
            letter-spacing: 0.04em;
            white-space: nowrap;
        }

        .step-number {
            font-family: 'Roboto Mono', 'Inter', monospace;
            font-size: 3rem;
            font-weight: 800;
            letter-spacing: -0.03em;
            color: rgba(198, 255, 61, 0.2);
            line-height: 1;
        }

        @media (max-width: 768px) {
            .container {
                padding: 0 20px;
            }

            .price-card {
                padding: 24px 20px;
            }

            .price-card .price-value {
                font-size: 2.2rem;
            }

            .stat-number {
                font-size: 1.8rem;
            }

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

        @media (max-width: 480px) {
            .container {
                padding: 0 14px;
            }

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

            .btn-secondary {
                padding: 10px 16px;
                font-size: 14px;
            }
        }

        .mobile-menu {
            position: fixed;
            top: 0;
            right: -100%;
            width: 100%;
            max-width: 400px;
            height: 100vh;
            background: var(--bg-dark);
            z-index: 60;
            transition: right 0.35s ease;
            display: flex;
            flex-direction: column;
            padding: 24px 32px;
            border-left: 1px solid var(--line-dark);
            overflow-y: auto;
        }

        .mobile-menu.open {
            right: 0;
        }

        .mobile-menu-overlay {
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.55);
            z-index: 55;
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.3s ease;
        }

        .mobile-menu-overlay.open {
            opacity: 1;
            pointer-events: auto;
        }

        .mobile-nav-link {
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--text-primary);
            padding: 16px 0;
            border-bottom: 1px solid var(--line-dark);
            transition: color 0.25s ease;
            letter-spacing: -0.01em;
        }

        .mobile-nav-link:hover,
        .mobile-nav-link.active {
            color: var(--accent);
        }

        .mobile-nav-link .mobile-index {
            font-family: 'Roboto Mono', 'Inter', monospace;
            font-size: 0.75rem;
            color: var(--text-ghost);
            font-weight: 500;
        }

/* roulang page: category6 */
:root {
            --bg-dark: #0E1013;
            --bg-panel: #15181D;
            --text-primary: #F4F5F1;
            --text-ghost: #9AA0A6;
            --line-dark: #2A2F35;
            --bg-light: #F4F5F1;
            --text-ink: #1A1D20;
            --accent: #C6FF3D;
            --accent-vermilion: #FF4A2D;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-full: 999px;
            --shadow-dark: 0 24px 60px rgba(0, 0, 0, 0.28);
            --shadow-light: 0 12px 30px rgba(20, 20, 20, 0.08);
            --spacing-8: 8px;
            --spacing-16: 16px;
            --spacing-24: 24px;
            --spacing-32: 32px;
            --spacing-48: 48px;
            --spacing-64: 64px;
            --spacing-96: 96px;
            --spacing-120: 120px;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Inter', sans-serif;
            line-height: 1.85;
            background-color: var(--bg-dark);
            color: var(--text-primary);
            overflow-x: hidden;
            font-size: 16px;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: color 0.25s ease, border-color 0.25s ease;
        }
        button, input, textarea, select {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            background: none;
            color: inherit;
        }
        button {
            cursor: pointer;
        }
        .container {
            max-width: 1360px;
            margin: 0 auto;
            padding: 0 32px;
        }
        .container-narrow {
            max-width: 860px;
            margin: 0 auto;
            padding: 0 32px;
        }
        .btn-primary {
            background-color: var(--accent);
            color: #0E1013;
            font-weight: 700;
            padding: 14px 32px;
            border-radius: var(--radius-full);
            transition: all 0.25s ease;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 15px;
            letter-spacing: 0.01em;
            line-height: 1.4;
            border: 2px solid var(--accent);
        }
        .btn-primary:hover {
            background-color: #d2ff5e;
            border-color: #d2ff5e;
            transform: translateY(-2px);
            box-shadow: 0 12px 28px rgba(198, 255, 61, 0.22);
        }
        .btn-primary:active {
            transform: scale(0.98);
            box-shadow: none;
        }
        .btn-secondary {
            background: transparent;
            color: var(--text-primary);
            font-weight: 600;
            padding: 12px 20px;
            border-radius: var(--radius-full);
            border: 1.5px solid var(--line-dark);
            transition: all 0.25s ease;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 15px;
            letter-spacing: 0.01em;
            line-height: 1.4;
        }
        .btn-secondary:hover {
            border-color: var(--accent);
            color: var(--accent);
            transform: translateY(-2px);
        }
        .btn-secondary:active {
            transform: scale(0.98);
        }
        .btn-ghost-link {
            background: transparent;
            color: var(--accent);
            font-weight: 600;
            padding: 10px 4px;
            border-bottom: 2px solid var(--accent);
            transition: all 0.25s ease;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 15px;
            letter-spacing: 0.01em;
            line-height: 1.4;
            border-radius: 0;
        }
        .btn-ghost-link:hover {
            color: #d2ff5e;
            border-bottom-width: 3px;
            padding-left: 8px;
        }
        .section-label {
            font-family: 'Roboto Mono', 'Inter', monospace;
            font-size: 13px;
            font-weight: 500;
            letter-spacing: 0.12em;
            text-transform: uppercase;
            color: var(--accent);
            margin-bottom: 12px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .section-label::before {
            content: '';
            width: 24px;
            height: 2px;
            background: var(--accent);
            display: inline-block;
        }
        .section-title {
            font-size: clamp(2rem, 4vw, 3rem);
            font-weight: 800;
            letter-spacing: -0.02em;
            line-height: 1.25;
            margin-bottom: 16px;
            color: var(--text-primary);
        }
        .section-desc {
            font-size: 1.1rem;
            color: var(--text-ghost);
            line-height: 1.9;
            margin-bottom: 40px;
            max-width: 720px;
        }
        .nav-link {
            font-size: 0.92rem;
            font-weight: 500;
            color: var(--text-ghost);
            letter-spacing: 0.02em;
            padding: 6px 0;
            position: relative;
            transition: color 0.25s ease;
            white-space: nowrap;
        }
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--accent);
            transition: width 0.3s ease;
        }
        .nav-link:hover,
        .nav-link.active {
            color: var(--text-primary);
        }
        .nav-link:hover::after,
        .nav-link.active::after {
            width: 100%;
        }
        .nav-link.active::before {
            content: '';
            position: absolute;
            top: 50%;
            left: -16px;
            transform: translateY(-50%);
            width: 6px;
            height: 6px;
            background: var(--accent);
            border-radius: 50%;
        }
        .card-hover {
            transition: all 0.3s ease;
        }
        .card-hover:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-dark);
        }
        .focus-ring:focus-visible {
            outline: 2px solid var(--accent-vermilion);
            outline-offset: 2px;
        }
        .breadcrumb-link {
            font-size: 0.85rem;
            color: var(--text-ghost);
            transition: color 0.25s ease;
        }
        .breadcrumb-link:hover {
            color: var(--accent);
        }
        .breadcrumb-sep {
            color: var(--line-dark);
            font-size: 0.8rem;
            margin: 0 8px;
        }
        .article-body {
            font-size: 1.05rem;
            line-height: 2.0;
            color: #D5D9DE;
        }
        .article-body p {
            margin-bottom: 1.5rem;
        }
        .article-body h3 {
            font-size: 1.35rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-top: 2.5rem;
            margin-bottom: 1rem;
            letter-spacing: -0.01em;
        }
        .article-body .lead-in {
            font-size: 1.2rem;
            font-weight: 500;
            color: var(--text-primary);
            line-height: 2.0;
            margin-bottom: 2rem;
        }
        .article-body .dropcap::first-letter {
            font-size: 3.5rem;
            font-weight: 800;
            color: var(--accent);
            float: left;
            line-height: 1;
            margin-right: 12px;
            margin-top: 4px;
        }
        .article-body blockquote {
            border-left: 3px solid var(--accent);
            padding: 16px 24px;
            margin: 2rem 0;
            background: var(--bg-panel);
            border-radius: 0 var(--radius-md) var(--radius-md) 0;
            font-size: 1.05rem;
            color: var(--text-primary);
            line-height: 1.9;
        }
        .data-panel {
            background: var(--bg-panel);
            border: 1px solid var(--line-dark);
            border-radius: var(--radius-md);
            padding: 24px 28px;
            margin: 2rem 0;
        }
        .data-panel .dp-label {
            font-family: 'Roboto Mono', monospace;
            font-size: 12px;
            letter-spacing: 0.1em;
            text-transform: uppercase;
            color: var(--text-ghost);
            margin-bottom: 6px;
        }
        .data-panel .dp-value {
            font-family: 'Roboto Mono', monospace;
            font-size: 2rem;
            font-weight: 700;
            color: var(--accent);
            line-height: 1.2;
        }
        .data-panel .dp-note {
            font-size: 0.85rem;
            color: var(--text-ghost);
            margin-top: 4px;
        }
        .faq-item {
            border-bottom: 1px solid var(--line-dark);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            padding: 20px 4px;
            font-size: 1.05rem;
            font-weight: 600;
            color: var(--text-primary);
            text-align: left;
            transition: color 0.25s ease;
        }
        .faq-question:hover {
            color: var(--accent);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            color: var(--text-ghost);
            font-size: 0.98rem;
            line-height: 1.9;
            padding-left: 4px;
        }
        .faq-item.open .faq-answer {
            max-height: 500px;
            padding-bottom: 20px;
        }
        .faq-item.open .faq-icon {
            transform: rotate(45deg);
            color: var(--accent);
        }
        .faq-icon {
            font-size: 1.2rem;
            color: var(--text-ghost);
            transition: transform 0.3s ease, color 0.3s ease;
            flex-shrink: 0;
            margin-left: 16px;
        }
        .refer-entry {
            border: 1px solid var(--line-dark);
            border-radius: var(--radius-md);
            padding: 24px 28px;
            transition: all 0.3s ease;
            background: var(--bg-panel);
            display: block;
        }
        .refer-entry:hover {
            border-color: var(--accent);
            transform: translateY(-3px);
            box-shadow: var(--shadow-dark);
        }
        .refer-entry .re-number {
            font-family: 'Roboto Mono', monospace;
            font-size: 13px;
            color: var(--accent);
            letter-spacing: 0.08em;
        }
        .refer-entry .re-title {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-top: 8px;
            margin-bottom: 8px;
        }
        .refer-entry .re-desc {
            font-size: 0.92rem;
            color: var(--text-ghost);
            line-height: 1.75;
        }
        .section-bg-light {
            background: var(--bg-light);
            color: var(--text-ink);
        }
        .section-bg-light .section-title {
            color: var(--text-ink);
        }
        .section-bg-light .section-desc {
            color: #5A6066;
        }
        .section-bg-light .faq-question {
            color: var(--text-ink);
        }
        .section-bg-light .faq-question:hover {
            color: #5a8a00;
        }
        .section-bg-light .faq-answer {
            color: #5A6066;
        }
        .section-bg-light .faq-item {
            border-bottom-color: #D8DAD6;
        }
        .section-bg-light .refer-entry {
            background: #FFFFFF;
            border-color: #D8DAD6;
            box-shadow: var(--shadow-light);
        }
        .section-bg-light .refer-entry .re-title {
            color: var(--text-ink);
        }
        .section-bg-light .refer-entry .re-desc {
            color: #5A6066;
        }
        .section-bg-light .article-body {
            color: #3A3F45;
        }
        .section-bg-light .article-body h3 {
            color: var(--text-ink);
        }
        .section-bg-light .article-body blockquote {
            background: #FFFFFF;
            border-left-color: var(--accent);
            color: var(--text-ink);
        }
        .section-bg-light .data-panel {
            background: #FFFFFF;
            border-color: #D8DAD6;
            box-shadow: var(--shadow-light);
        }
        .section-bg-light .data-panel .dp-value {
            color: #4a7a00;
        }
        .section-bg-light .data-panel .dp-label,
        .section-bg-light .data-panel .dp-note {
            color: #6B7280;
        }
        .mobile-menu {
            display: none;
            position: fixed;
            inset: 0;
            z-index: 60;
            background: #0E1013;
            padding: 24px 32px;
            overflow-y: auto;
        }
        .mobile-menu.open {
            display: block;
        }
        .mobile-menu .mm-link {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 16px 0;
            font-size: 1.35rem;
            font-weight: 700;
            color: var(--text-primary);
            border-bottom: 1px solid var(--line-dark);
            transition: color 0.25s ease;
        }
        .mobile-menu .mm-link:hover {
            color: var(--accent);
        }
        .mobile-menu .mm-link .mm-num {
            font-family: 'Roboto Mono', monospace;
            font-size: 0.8rem;
            color: var(--text-ghost);
            letter-spacing: 0.1em;
        }
        .mobile-menu .mm-bottom {
            margin-top: 32px;
            padding-top: 24px;
            border-top: 1px solid var(--line-dark);
            font-size: 0.8rem;
            color: var(--text-ghost);
            line-height: 1.8;
        }
        @media (max-width: 1024px) {
            .container, .container-narrow {
                padding: 0 24px;
            }
        }
        @media (max-width: 768px) {
            body {
                font-size: 15px;
            }
            .container, .container-narrow {
                padding: 0 20px;
            }
            .article-body {
                font-size: 0.98rem;
            }
            .article-body .dropcap::first-letter {
                font-size: 2.8rem;
            }
        }
        @media (max-width: 520px) {
            .container, .container-narrow {
                padding: 0 16px;
            }
            .article-body {
                font-size: 0.95rem;
            }
            .data-panel .dp-value {
                font-size: 1.5rem;
            }
            .refer-entry {
                padding: 18px 20px;
            }
        }