/* roulang page: index */
:root {
            --color-primary: #6C5CE7;
            --color-primary-dark: #5A4BD1;
            --color-accent: #FFD93D;
            --color-accent-hover: #FFE566;
            --color-bg-deep: #0A0E27;
            --color-bg-card: #141832;
            --color-bg-section: #0F1330;
            --color-surface: #1A1F3A;
            --color-border: rgba(255, 255, 255, 0.08);
            --color-text: #EDEEF2;
            --color-text-weak: #9BA0BF;
            --color-text-muted: #6B7094;
            --color-danger: #FF6B6B;
            --color-success: #51CF66;
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
            --shadow-md: 0 8px 28px rgba(0, 0, 0, 0.35);
            --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
            --shadow-glow: 0 0 40px rgba(108, 92, 231, 0.3);
            --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
            --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-smooth: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
        }

        *,
        *::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: var(--font-sans);
            background-color: var(--color-bg-deep);
            color: var(--color-text);
            line-height: 1.7;
            min-height: 100vh;
            overflow-x: hidden;
        }

        a {
            color: var(--color-accent);
            text-decoration: none;
            transition: color var(--transition-fast);
        }
        a:hover {
            color: var(--color-accent-hover);
        }
        a:focus-visible {
            outline: 2px solid var(--color-accent);
            outline-offset: 3px;
            border-radius: 4px;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button {
            font-family: var(--font-sans);
            cursor: pointer;
            transition: all var(--transition-fast);
        }
        button:focus-visible {
            outline: 2px solid var(--color-accent);
            outline-offset: 3px;
        }
        input {
            font-family: var(--font-sans);
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 768px) {
            .container {
                padding: 0 16px;
            }
        }

        .section-padding {
            padding: 80px 0;
        }
        @media (max-width: 768px) {
            .section-padding {
                padding: 50px 0;
            }
        }
        @media (max-width: 520px) {
            .section-padding {
                padding: 36px 0;
            }
        }

        .section-label {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            font-weight: 700;
            letter-spacing: 0.06em;
            text-transform: uppercase;
            color: var(--color-accent);
            margin-bottom: 14px;
            background: rgba(255, 217, 61, 0.1);
            padding: 6px 16px;
            border-radius: 50px;
            border: 1px solid rgba(255, 217, 61, 0.25);
        }
        .section-title {
            font-size: 2.4rem;
            font-weight: 800;
            color: var(--color-text);
            margin-bottom: 16px;
            letter-spacing: -0.02em;
            line-height: 1.25;
        }
        @media (max-width: 768px) {
            .section-title {
                font-size: 1.75rem;
            }
        }
        @media (max-width: 520px) {
            .section-title {
                font-size: 1.45rem;
            }
        }
        .section-subtitle {
            font-size: 1.1rem;
            color: var(--color-text-weak);
            max-width: 640px;
            line-height: 1.65;
        }

        /* Header / Nav */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1050;
            background: rgba(10, 14, 39, 0.85);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--color-border);
            transition: background var(--transition-smooth);
        }
        .site-header.scrolled {
            background: rgba(10, 14, 39, 0.95);
            box-shadow: var(--shadow-md);
        }
        .navbar {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 14px 0;
            flex-wrap: wrap;
        }
        .navbar-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--color-text);
            letter-spacing: -0.01em;
            white-space: nowrap;
        }
        .navbar-brand i {
            color: var(--color-accent);
            font-size: 1.5rem;
        }
        .navbar-brand:hover {
            color: var(--color-text);
            text-decoration: none;
        }
        .navbar-brand .brand-icon {
            width: 38px;
            height: 38px;
            border-radius: var(--radius-sm);
            background: linear-gradient(135deg, var(--color-primary), #8B7CF7);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            color: #fff;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 6px;
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .nav-links a {
            display: inline-flex;
            align-items: center;
            gap: 5px;
            padding: 9px 18px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.95rem;
            color: var(--color-text-weak);
            transition: all var(--transition-fast);
            white-space: nowrap;
            text-decoration: none;
        }
        .nav-links a:hover {
            color: var(--color-text);
            background: rgba(255, 255, 255, 0.05);
        }
        .nav-links a.active {
            color: #fff;
            background: var(--color-primary);
            box-shadow: var(--shadow-glow);
        }
        .nav-links a.nav-cta {
            background: var(--color-accent);
            color: #1a1a2e;
            font-weight: 700;
            padding: 10px 22px;
            box-shadow: 0 4px 16px rgba(255, 217, 61, 0.3);
        }
        .nav-links a.nav-cta:hover {
            background: var(--color-accent-hover);
            box-shadow: 0 6px 24px rgba(255, 217, 61, 0.45);
            transform: translateY(-1px);
            color: #1a1a2e;
        }
        .navbar-toggler {
            display: none;
            background: none;
            border: none;
            color: var(--color-text);
            font-size: 1.6rem;
            padding: 6px 10px;
            border-radius: var(--radius-sm);
        }
        .navbar-toggler:hover {
            background: rgba(255, 255, 255, 0.08);
        }
        @media (max-width: 860px) {
            .navbar-toggler {
                display: block;
            }
            .nav-links {
                display: none;
                flex-direction: column;
                width: 100%;
                gap: 4px;
                padding-top: 12px;
            }
            .nav-links.show {
                display: flex;
            }
            .nav-links a {
                width: 100%;
                justify-content: center;
                padding: 12px 18px;
                border-radius: var(--radius-md);
            }
        }

        /* Hero */
        .hero-section {
            position: relative;
            padding: 100px 0 90px;
            background: linear-gradient(180deg, #0A0E27 0%, #111640 40%, #0F1330 100%);
            overflow: hidden;
        }
        .hero-bg-img {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            opacity: 0.35;
            pointer-events: none;
            z-index: 0;
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 50% 30%, rgba(108, 92, 231, 0.25) 0%, transparent 70%),
                radial-gradient(ellipse at 20% 70%, rgba(255, 217, 61, 0.1) 0%, transparent 50%),
                radial-gradient(ellipse at 80% 60%, rgba(108, 92, 231, 0.15) 0%, transparent 50%);
            z-index: 1;
        }
        .hero-content {
            position: relative;
            z-index: 2;
            text-align: center;
            max-width: 720px;
            margin: 0 auto;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 7px;
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid rgba(255, 255, 255, 0.12);
            padding: 8px 20px;
            border-radius: 50px;
            font-size: 0.9rem;
            color: var(--color-accent);
            font-weight: 600;
            margin-bottom: 22px;
            animation: pulse-badge 3s ease-in-out infinite;
        }
        @keyframes pulse-badge {
            0%,
            100% {
                box-shadow: 0 0 0 0 rgba(255, 217, 61, 0.3);
            }
            50% {
                box-shadow: 0 0 0 14px rgba(255, 217, 61, 0);
            }
        }
        .hero-badge .dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--color-success);
            animation: blink-dot 1.5s ease-in-out infinite;
        }
        @keyframes blink-dot {
            0%,
            100% {
                opacity: 1;
            }
            50% {
                opacity: 0.3;
            }
        }
        .hero-title {
            font-size: 3.2rem;
            font-weight: 900;
            color: #fff;
            line-height: 1.2;
            letter-spacing: -0.03em;
            margin-bottom: 18px;
        }
        .hero-title .highlight {
            background: linear-gradient(135deg, var(--color-accent), #FFE88D);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.2rem;
            }
            .hero-section {
                padding: 70px 0 60px;
            }
        }
        @media (max-width: 520px) {
            .hero-title {
                font-size: 1.7rem;
            }
            .hero-section {
                padding: 50px 0 40px;
            }
        }
        .hero-desc {
            font-size: 1.15rem;
            color: var(--color-text-weak);
            margin-bottom: 32px;
            line-height: 1.7;
            max-width: 540px;
            margin-left: auto;
            margin-right: auto;
        }
        .hero-buttons {
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
            justify-content: center;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 13px 28px;
            border-radius: 50px;
            font-weight: 700;
            font-size: 1rem;
            border: none;
            transition: all var(--transition-smooth);
            white-space: nowrap;
            text-decoration: none;
        }
        .btn-primary-glow {
            background: var(--color-primary);
            color: #fff;
            box-shadow: var(--shadow-glow);
        }
        .btn-primary-glow:hover {
            background: var(--color-primary-dark);
            box-shadow: 0 0 56px rgba(108, 92, 231, 0.5);
            transform: translateY(-2px);
            color: #fff;
        }
        .btn-outline-light {
            background: transparent;
            color: var(--color-text);
            border: 2px solid rgba(255, 255, 255, 0.25);
        }
        .btn-outline-light:hover {
            background: rgba(255, 255, 255, 0.08);
            border-color: rgba(255, 255, 255, 0.5);
            color: #fff;
            transform: translateY(-2px);
        }
        .btn-accent {
            background: var(--color-accent);
            color: #1a1a2e;
            font-weight: 700;
            box-shadow: 0 4px 18px rgba(255, 217, 61, 0.35);
        }
        .btn-accent:hover {
            background: var(--color-accent-hover);
            box-shadow: 0 8px 30px rgba(255, 217, 61, 0.55);
            transform: translateY(-2px);
            color: #1a1a2e;
        }
        .btn-sm {
            padding: 8px 18px;
            font-size: 0.85rem;
        }
        .btn-lg {
            padding: 16px 36px;
            font-size: 1.1rem;
        }

        /* Stats Row */
        .stats-row {
            display: flex;
            gap: 20px;
            flex-wrap: wrap;
            justify-content: center;
            margin-top: 50px;
        }
        .stat-item {
            text-align: center;
            padding: 18px 28px;
            border-radius: var(--radius-lg);
            background: rgba(255, 255, 255, 0.03);
            border: 1px solid var(--color-border);
            min-width: 120px;
        }
        .stat-number {
            font-size: 2rem;
            font-weight: 900;
            color: var(--color-accent);
            line-height: 1;
            margin-bottom: 4px;
        }
        .stat-label {
            font-size: 0.85rem;
            color: var(--color-text-weak);
        }
        @media (max-width: 520px) {
            .stats-row {
                gap: 10px;
                margin-top: 30px;
            }
            .stat-item {
                padding: 14px 16px;
                min-width: 80px;
            }
            .stat-number {
                font-size: 1.5rem;
            }
        }

        /* Feature Cards */
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 24px;
            margin-top: 40px;
        }
        @media (max-width: 520px) {
            .feature-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
        }
        .feature-card {
            background: var(--color-bg-card);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            padding: 32px 26px;
            transition: all var(--transition-smooth);
            position: relative;
            overflow: hidden;
        }
        .feature-card::before {
            content: '';
            position: absolute;
            top: -40px;
            right: -40px;
            width: 100px;
            height: 100px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(108, 92, 231, 0.2) 0%, transparent 70%);
            pointer-events: none;
        }
        .feature-card:hover {
            border-color: rgba(255, 255, 255, 0.2);
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
        }
        .feature-card .card-icon {
            width: 50px;
            height: 50px;
            border-radius: var(--radius-sm);
            background: linear-gradient(135deg, var(--color-primary), rgba(108, 92, 231, 0.5));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            color: #fff;
            margin-bottom: 18px;
            position: relative;
            z-index: 1;
        }
        .feature-card h3 {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--color-text);
            margin-bottom: 8px;
            position: relative;
            z-index: 1;
        }
        .feature-card p {
            font-size: 0.92rem;
            color: var(--color-text-weak);
            margin: 0;
            position: relative;
            z-index: 1;
            line-height: 1.6;
        }

        /* Category Entrance */
        .category-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
            gap: 28px;
            margin-top: 40px;
        }
        @media (max-width: 768px) {
            .category-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
        }
        .category-card {
            background: var(--color-bg-card);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-xl);
            overflow: hidden;
            transition: all var(--transition-smooth);
            display: flex;
            flex-direction: column;
        }
        .category-card:hover {
            border-color: rgba(255, 255, 255, 0.2);
            box-shadow: var(--shadow-lg);
            transform: translateY(-5px);
        }
        .category-card .card-img-wrap {
            height: 200px;
            overflow: hidden;
            position: relative;
        }
        .category-card .card-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform var(--transition-smooth);
        }
        .category-card:hover .card-img-wrap img {
            transform: scale(1.06);
        }
        .category-card .card-body-cat {
            padding: 24px 22px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .category-card .card-body-cat h3 {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--color-text);
            margin-bottom: 8px;
        }
        .category-card .card-body-cat p {
            font-size: 0.9rem;
            color: var(--color-text-weak);
            margin-bottom: 16px;
            flex: 1;
        }
        .category-card .card-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-weight: 700;
            font-size: 0.9rem;
            color: var(--color-accent);
        }
        .category-card .card-link:hover {
            gap: 10px;
            color: var(--color-accent-hover);
        }

        /* News List */
        .news-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
            margin-top: 36px;
        }
        .news-item {
            display: flex;
            gap: 18px;
            align-items: flex-start;
            background: var(--color-bg-card);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: 20px 22px;
            transition: all var(--transition-fast);
            text-decoration: none;
            color: inherit;
        }
        .news-item:hover {
            border-color: rgba(255, 255, 255, 0.18);
            box-shadow: var(--shadow-sm);
            background: #191E3D;
            color: inherit;
            text-decoration: none;
        }
        .news-item .news-thumb {
            width: 100px;
            height: 70px;
            border-radius: var(--radius-sm);
            object-fit: cover;
            flex-shrink: 0;
        }
        .news-item .news-info {
            flex: 1;
            min-width: 0;
        }
        .news-item .news-info h4 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--color-text);
            margin-bottom: 4px;
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .news-item .news-meta {
            font-size: 0.8rem;
            color: var(--color-text-muted);
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
        }
        .news-empty {
            text-align: center;
            padding: 40px;
            color: var(--color-text-muted);
            font-size: 0.95rem;
        }
        @media (max-width: 520px) {
            .news-item .news-thumb {
                width: 70px;
                height: 50px;
            }
            .news-item {
                padding: 14px 12px;
                gap: 10px;
            }
        }

        /* Timeline / Steps */
        .steps-container {
            display: flex;
            flex-wrap: wrap;
            gap: 0;
            margin-top: 40px;
            position: relative;
        }
        .step-item {
            flex: 1;
            min-width: 200px;
            text-align: center;
            padding: 24px 16px;
            position: relative;
            border-right: 1px dashed var(--color-border);
        }
        .step-item:last-child {
            border-right: none;
        }
        .step-number {
            width: 52px;
            height: 52px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--color-primary), #8B7CF7);
            color: #fff;
            font-weight: 900;
            font-size: 1.3rem;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 14px;
            box-shadow: var(--shadow-glow);
        }
        .step-item h4 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--color-text);
            margin-bottom: 6px;
        }
        .step-item p {
            font-size: 0.85rem;
            color: var(--color-text-weak);
            margin: 0;
        }
        @media (max-width: 768px) {
            .steps-container {
                flex-direction: column;
                gap: 20px;
            }
            .step-item {
                border-right: none;
                border-bottom: 1px dashed var(--color-border);
                padding: 20px 10px;
            }
            .step-item:last-child {
                border-bottom: none;
            }
        }

        /* FAQ */
        .faq-list {
            margin-top: 36px;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--color-bg-card);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: all var(--transition-fast);
        }
        .faq-item:hover {
            border-color: rgba(255, 255, 255, 0.15);
        }
        .faq-question {
            width: 100%;
            background: none;
            border: none;
            padding: 18px 22px;
            text-align: left;
            font-size: 1rem;
            font-weight: 700;
            color: var(--color-text);
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
        }
        .faq-question i {
            transition: transform var(--transition-fast);
            color: var(--color-text-weak);
            font-size: 0.85rem;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
            color: var(--color-accent);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-smooth), padding var(--transition-smooth);
            padding: 0 22px;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 22px 18px;
        }
        .faq-answer p {
            font-size: 0.9rem;
            color: var(--color-text-weak);
            margin: 0;
            line-height: 1.7;
        }

        /* CTA Section */
        .cta-section {
            background: linear-gradient(135deg, #141832 0%, #1A1F3A 50%, #111640 100%);
            border-radius: var(--radius-xl);
            padding: 60px 40px;
            text-align: center;
            border: 1px solid var(--color-border);
            position: relative;
            overflow: hidden;
            margin-top: 40px;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: -60px;
            left: -60px;
            width: 200px;
            height: 200px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(108, 92, 231, 0.3) 0%, transparent 70%);
            pointer-events: none;
        }
        .cta-section::after {
            content: '';
            position: absolute;
            bottom: -40px;
            right: -40px;
            width: 160px;
            height: 160px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(255, 217, 61, 0.2) 0%, transparent 70%);
            pointer-events: none;
        }
        .cta-section h2 {
            font-size: 1.9rem;
            font-weight: 800;
            color: #fff;
            position: relative;
            z-index: 1;
            margin-bottom: 12px;
        }
        .cta-section p {
            color: var(--color-text-weak);
            position: relative;
            z-index: 1;
            margin-bottom: 24px;
            font-size: 1.05rem;
        }
        .cta-section .btn {
            position: relative;
            z-index: 1;
        }
        @media (max-width: 520px) {
            .cta-section {
                padding: 36px 18px;
                border-radius: var(--radius-lg);
            }
            .cta-section h2 {
                font-size: 1.4rem;
            }
        }

        /* Footer */
        .site-footer {
            background: #080b1a;
            border-top: 1px solid var(--color-border);
            padding: 50px 0 28px;
            margin-top: 80px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.5fr;
            gap: 36px;
            margin-bottom: 36px;
        }
        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
        }
        @media (max-width: 520px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
        }
        .footer-col h4 {
            font-size: 0.95rem;
            font-weight: 700;
            color: var(--color-text);
            margin-bottom: 14px;
            letter-spacing: 0.02em;
        }
        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-col ul li {
            margin-bottom: 8px;
        }
        .footer-col ul li a {
            font-size: 0.88rem;
            color: var(--color-text-weak);
            transition: color var(--transition-fast);
            text-decoration: none;
        }
        .footer-col ul li a:hover {
            color: var(--color-accent);
        }
        .footer-brand {
            font-size: 1.2rem;
            font-weight: 800;
            color: var(--color-text);
            margin-bottom: 10px;
        }
        .footer-brand i {
            color: var(--color-accent);
        }
        .footer-desc {
            font-size: 0.88rem;
            color: var(--color-text-muted);
            line-height: 1.6;
        }
        .footer-bottom {
            border-top: 1px solid var(--color-border);
            padding-top: 20px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 12px;
            font-size: 0.82rem;
            color: var(--color-text-muted);
        }
        .footer-bottom a {
            color: var(--color-text-weak);
            text-decoration: none;
        }
        .footer-bottom a:hover {
            color: var(--color-accent);
        }

        /* Utility */
        .text-center {
            text-align: center;
        }
        .mb-0 {
            margin-bottom: 0;
        }
        .mt-auto {
            margin-top: auto;
        }
        .bg-section-alt {
            background: var(--color-bg-section);
        }

        /* Back to top */
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--color-primary);
            color: #fff;
            border: none;
            font-size: 1.1rem;
            z-index: 999;
            opacity: 0;
            pointer-events: none;
            transition: all var(--transition-smooth);
            box-shadow: var(--shadow-md);
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .back-to-top.visible {
            opacity: 1;
            pointer-events: auto;
        }
        .back-to-top:hover {
            background: var(--color-primary-dark);
            transform: translateY(-3px);
            box-shadow: var(--shadow-lg);
        }

        /* Highlight text */
        .text-accent {
            color: var(--color-accent);
        }
        .text-primary {
            color: var(--color-primary);
        }
        .fw-bold {
            font-weight: 700;
        }

/* roulang page: article */
:root {
            --color-primary: #4A30B5;
            --color-primary-dark: #36248A;
            --color-primary-light: #6C5CE7;
            --color-primary-glow: rgba(74, 48, 181, 0.25);
            --color-accent: #F5A623;
            --color-accent-light: #FFD275;
            --color-accent-glow: rgba(245, 166, 35, 0.3);
            --color-bg: #FAFAFC;
            --color-surface: #FFFFFF;
            --color-text: #1E1E2E;
            --color-text-strong: #0F0B1F;
            --color-text-muted: #6B7280;
            --color-text-light: #9CA3AF;
            --color-border: #E5E7EB;
            --color-border-light: #F0F0F4;
            --color-dark: #0F0B1F;
            --color-dark-surface: #1A1535;
            --color-success: #10B981;
            --color-warning: #F59E0B;
            --color-danger: #EF4444;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --radius-full: 9999px;
            --shadow-xs: 0 1px 2px rgba(15, 11, 31, 0.04);
            --shadow-sm: 0 2px 8px rgba(15, 11, 31, 0.06);
            --shadow-md: 0 4px 16px rgba(15, 11, 31, 0.10);
            --shadow-lg: 0 8px 32px rgba(15, 11, 31, 0.14);
            --shadow-xl: 0 16px 48px rgba(15, 11, 31, 0.18);
            --shadow-glow: 0 0 40px var(--color-primary-glow);
            --shadow-accent-glow: 0 0 30px var(--color-accent-glow);
            --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
            --font-mono: 'SF Mono', 'Fira Code', 'Consolas', 'Monaco', monospace;
            --transition-fast: 0.15s ease;
            --transition-base: 0.25s ease;
            --transition-slow: 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            --container-max: 1200px;
            --container-narrow: 820px;
            --header-height: 68px;
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            font-size: 16px;
        }

        body {
            font-family: var(--font-sans);
            line-height: 1.7;
            color: var(--color-text);
            background-color: var(--color-bg);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            overflow-x: hidden;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-md);
        }

        a {
            color: var(--color-primary);
            text-decoration: none;
            transition: color var(--transition-fast), opacity var(--transition-fast);
        }
        a:hover {
            color: var(--color-primary-light);
        }
        a:focus-visible {
            outline: 2px solid var(--color-primary-light);
            outline-offset: 3px;
            border-radius: 4px;
        }

        button {
            cursor: pointer;
            font-family: inherit;
            font-size: inherit;
            border: none;
            background: none;
        }
        button:focus-visible {
            outline: 2px solid var(--color-primary-light);
            outline-offset: 3px;
            border-radius: 4px;
        }

        input {
            font-family: inherit;
            font-size: inherit;
        }

        .container {
            width: 100%;
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }
        .container--narrow {
            max-width: var(--container-narrow);
        }

        /* ========== HEADER / NAV ========== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--color-border-light);
            box-shadow: var(--shadow-xs);
            height: var(--header-height);
            display: flex;
            align-items: center;
            transition: background var(--transition-base), box-shadow var(--transition-base);
        }
        .site-header.scrolled {
            box-shadow: var(--shadow-sm);
            background: rgba(255, 255, 255, 0.96);
        }

        .navbar {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            gap: 20px;
        }

        .navbar-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--color-text-strong);
            white-space: nowrap;
            letter-spacing: -0.01em;
            transition: opacity var(--transition-fast);
        }
        .navbar-brand:hover {
            opacity: 0.85;
            color: var(--color-text-strong);
        }
        .brand-icon {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
            color: #fff;
            border-radius: var(--radius-md);
            font-size: 1rem;
            box-shadow: 0 4px 14px var(--color-primary-glow);
            flex-shrink: 0;
        }

        .navbar-toggler {
            display: none;
            align-items: center;
            justify-content: center;
            width: 42px;
            height: 42px;
            border-radius: var(--radius-md);
            background: var(--color-bg);
            color: var(--color-text);
            font-size: 1.25rem;
            transition: background var(--transition-fast), color var(--transition-fast);
            flex-shrink: 0;
        }
        .navbar-toggler:hover {
            background: var(--color-primary);
            color: #fff;
        }
        .navbar-toggler:active {
            transform: scale(0.94);
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 6px;
            list-style: none;
            flex-wrap: wrap;
        }
        .nav-links li a {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 10px 16px;
            border-radius: var(--radius-full);
            font-weight: 500;
            font-size: 0.95rem;
            color: var(--color-text-muted);
            transition: all var(--transition-fast);
            white-space: nowrap;
        }
        .nav-links li a:hover {
            color: var(--color-primary);
            background: rgba(74, 48, 181, 0.05);
        }
        .nav-links li a.active {
            color: var(--color-primary);
            background: rgba(74, 48, 181, 0.08);
            font-weight: 600;
        }
        .nav-links .nav-cta {
            background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
            color: #fff !important;
            font-weight: 600;
            box-shadow: 0 2px 10px var(--color-primary-glow);
            margin-left: 4px;
            transition: all var(--transition-fast);
        }
        .nav-links .nav-cta:hover {
            box-shadow: 0 6px 22px var(--color-primary-glow);
            transform: translateY(-1px);
            background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
        }
        .nav-links .nav-cta:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px var(--color-primary-glow);
        }

        @media (max-width: 860px) {
            .navbar-toggler {
                display: flex;
            }
            .nav-links {
                display: none;
                position: absolute;
                top: var(--header-height);
                left: 0;
                right: 0;
                flex-direction: column;
                background: #fff;
                border-bottom: 1px solid var(--color-border);
                box-shadow: var(--shadow-lg);
                padding: 12px 16px 20px;
                gap: 2px;
                z-index: 999;
            }
            .nav-links.show {
                display: flex;
            }
            .nav-links li a {
                width: 100%;
                justify-content: flex-start;
                padding: 12px 16px;
                border-radius: var(--radius-md);
                font-size: 1rem;
            }
            .nav-links .nav-cta {
                margin-left: 0;
                justify-content: center;
                margin-top: 6px;
            }
        }

        /* ========== ARTICLE HERO BANNER ========== */
        .article-hero {
            position: relative;
            padding: 64px 0 52px;
            background: var(--color-dark) url('/assets/images/backpic/back-2.png') center / cover no-repeat;
            color: #fff;
            text-align: center;
            overflow: hidden;
        }
        .article-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(15, 11, 31, 0.72) 0%, rgba(26, 21, 53, 0.88) 100%);
            z-index: 0;
        }
        .article-hero .container {
            position: relative;
            z-index: 1;
        }
        .article-hero .breadcrumb {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            flex-wrap: wrap;
            font-size: 0.875rem;
            color: rgba(255, 255, 255, 0.7);
            margin-bottom: 20px;
        }
        .article-hero .breadcrumb a {
            color: rgba(255, 255, 255, 0.8);
            transition: color var(--transition-fast);
        }
        .article-hero .breadcrumb a:hover {
            color: var(--color-accent-light);
        }
        .article-hero .breadcrumb .sep {
            color: rgba(255, 255, 255, 0.35);
            font-size: 0.7rem;
        }
        .article-hero .breadcrumb .current {
            color: var(--color-accent-light);
            font-weight: 500;
        }
        .article-hero .article-category-tag {
            display: inline-block;
            padding: 5px 14px;
            background: rgba(245, 166, 35, 0.2);
            color: var(--color-accent-light);
            border-radius: var(--radius-full);
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.02em;
            margin-bottom: 14px;
        }
        .article-hero h1 {
            font-size: 2.15rem;
            font-weight: 800;
            line-height: 1.3;
            letter-spacing: -0.02em;
            margin-bottom: 12px;
            color: #fff;
        }
        .article-hero .article-meta {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 18px;
            flex-wrap: wrap;
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.65);
        }
        .article-hero .article-meta span {
            display: inline-flex;
            align-items: center;
            gap: 5px;
        }
        @media (max-width: 768px) {
            .article-hero {
                padding: 44px 0 36px;
            }
            .article-hero h1 {
                font-size: 1.55rem;
            }
            .article-hero .article-meta {
                gap: 10px;
                font-size: 0.82rem;
            }
        }
        @media (max-width: 520px) {
            .article-hero h1 {
                font-size: 1.3rem;
            }
        }

        /* ========== ARTICLE CONTENT ========== */
        .article-content-wrapper {
            padding: 48px 0 56px;
            background: var(--color-bg);
        }
        .article-content-wrapper .container--narrow {
            background: var(--color-surface);
            border-radius: var(--radius-xl);
            padding: 40px 44px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--color-border-light);
        }
        .article-featured-image {
            margin: -40px -44px 32px;
            border-radius: var(--radius-xl) var(--radius-xl) 0 0;
            overflow: hidden;
        }
        .article-featured-image img {
            width: 100%;
            border-radius: 0;
            aspect-ratio: 16 / 9;
            object-fit: cover;
        }

        .article-body {
            font-size: 1.05rem;
            line-height: 1.85;
            color: var(--color-text);
        }
        .article-body h2 {
            font-size: 1.55rem;
            font-weight: 700;
            color: var(--color-text-strong);
            margin: 36px 0 14px;
            padding-top: 8px;
            letter-spacing: -0.01em;
            line-height: 1.35;
        }
        .article-body h3 {
            font-size: 1.25rem;
            font-weight: 600;
            color: var(--color-text-strong);
            margin: 28px 0 10px;
            line-height: 1.4;
        }
        .article-body p {
            margin-bottom: 16px;
        }
        .article-body ul, .article-body ol {
            margin: 12px 0 20px;
            padding-left: 24px;
        }
        .article-body li {
            margin-bottom: 8px;
        }
        .article-body blockquote {
            border-left: 4px solid var(--color-primary);
            background: rgba(74, 48, 181, 0.03);
            padding: 16px 20px;
            margin: 24px 0;
            border-radius: 0 var(--radius-md) var(--radius-md) 0;
            color: var(--color-text-muted);
            font-style: italic;
        }
        .article-body code {
            background: var(--color-bg);
            padding: 2px 8px;
            border-radius: var(--radius-sm);
            font-family: var(--font-mono);
            font-size: 0.9em;
            color: var(--color-primary-dark);
        }
        .article-body pre {
            background: var(--color-dark-surface);
            color: #e0ddf0;
            padding: 20px 24px;
            border-radius: var(--radius-lg);
            overflow-x: auto;
            margin: 20px 0;
            font-size: 0.9rem;
            line-height: 1.6;
        }
        .article-body pre code {
            background: none;
            padding: 0;
            color: inherit;
        }
        .article-body img {
            margin: 20px 0;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
        }
        .article-body a {
            font-weight: 500;
            text-decoration: underline;
            text-underline-offset: 3px;
            text-decoration-thickness: 1px;
            text-decoration-color: rgba(74, 48, 181, 0.3);
        }
        .article-body a:hover {
            text-decoration-color: var(--color-primary);
        }

        @media (max-width: 768px) {
            .article-content-wrapper {
                padding: 28px 0 40px;
            }
            .article-content-wrapper .container--narrow {
                padding: 24px 20px;
                border-radius: var(--radius-lg);
            }
            .article-featured-image {
                margin: -24px -20px 24px;
                border-radius: var(--radius-lg) var(--radius-lg) 0 0;
            }
            .article-body {
                font-size: 0.98rem;
            }
            .article-body h2 {
                font-size: 1.3rem;
            }
            .article-body h3 {
                font-size: 1.1rem;
            }
        }
        @media (max-width: 520px) {
            .article-content-wrapper .container--narrow {
                padding: 18px 14px;
                border-radius: var(--radius-md);
            }
            .article-featured-image {
                margin: -18px -14px 20px;
                border-radius: var(--radius-md) var(--radius-md) 0 0;
            }
            .article-body {
                font-size: 0.95rem;
                line-height: 1.75;
            }
        }

        /* ========== NOT FOUND ========== */
        .not-found-section {
            padding: 80px 0 100px;
            text-align: center;
            background: var(--color-bg);
        }
        .not-found-icon {
            font-size: 5rem;
            color: var(--color-text-light);
            margin-bottom: 20px;
        }
        .not-found-section h2 {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--color-text-strong);
            margin-bottom: 10px;
        }
        .not-found-section p {
            color: var(--color-text-muted);
            margin-bottom: 28px;
            font-size: 1.05rem;
        }
        .btn-back {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            background: var(--color-primary);
            color: #fff;
            border-radius: var(--radius-full);
            font-weight: 600;
            font-size: 1rem;
            transition: all var(--transition-fast);
            box-shadow: 0 4px 16px var(--color-primary-glow);
        }
        .btn-back:hover {
            background: var(--color-primary-dark);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 24px var(--color-primary-glow);
        }

        /* ========== RELATED POSTS ========== */
        .related-section {
            padding: 0 0 60px;
            background: var(--color-bg);
        }
        .related-section .section-title {
            text-align: center;
            font-size: 1.6rem;
            font-weight: 700;
            color: var(--color-text-strong);
            margin-bottom: 32px;
            letter-spacing: -0.01em;
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .related-card {
            background: var(--color-surface);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--color-border-light);
            transition: all var(--transition-base);
            display: flex;
            flex-direction: column;
        }
        .related-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-lg);
            border-color: transparent;
        }
        .related-card-img {
            aspect-ratio: 16 / 10;
            overflow: hidden;
            position: relative;
        }
        .related-card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: 0;
            transition: transform var(--transition-slow);
        }
        .related-card:hover .related-card-img img {
            transform: scale(1.05);
        }
        .related-card-body {
            padding: 18px 20px 22px;
            flex: 1;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .related-card-tag {
            font-size: 0.75rem;
            font-weight: 600;
            color: var(--color-primary);
            text-transform: uppercase;
            letter-spacing: 0.04em;
        }
        .related-card-title {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--color-text-strong);
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card-title a {
            color: inherit;
        }
        .related-card-title a:hover {
            color: var(--color-primary);
        }
        .related-card-date {
            font-size: 0.8rem;
            color: var(--color-text-muted);
            margin-top: auto;
        }
        .related-empty {
            text-align: center;
            grid-column: 1 / -1;
            color: var(--color-text-muted);
            padding: 30px;
            font-size: 0.95rem;
        }

        @media (max-width: 900px) {
            .related-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 18px;
            }
        }
        @media (max-width: 560px) {
            .related-grid {
                grid-template-columns: 1fr;
                gap: 14px;
            }
            .related-section .section-title {
                font-size: 1.35rem;
            }
        }

        /* ========== CTA SECTION ========== */
        .cta-section {
            padding: 64px 0 72px;
            background: linear-gradient(170deg, var(--color-dark) 0%, var(--color-dark-surface) 40%, #1a1540 100%);
            color: #fff;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: -80px;
            right: -120px;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(108, 92, 231, 0.25) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .cta-section::after {
            content: '';
            position: absolute;
            bottom: -60px;
            left: -100px;
            width: 350px;
            height: 350px;
            background: radial-gradient(circle, rgba(245, 166, 35, 0.18) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .cta-section .container {
            position: relative;
            z-index: 1;
        }
        .cta-section h2 {
            font-size: 2rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            margin-bottom: 12px;
        }
        .cta-section p {
            font-size: 1.1rem;
            color: rgba(255, 255, 255, 0.7);
            margin-bottom: 32px;
            max-width: 560px;
            margin-left: auto;
            margin-right: auto;
        }
        .cta-buttons {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }
        .btn-primary-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            background: linear-gradient(135deg, var(--color-accent), #f7b840);
            color: #1a1a2e;
            font-weight: 700;
            font-size: 1.05rem;
            border-radius: var(--radius-full);
            box-shadow: 0 6px 24px var(--color-accent-glow);
            transition: all var(--transition-fast);
        }
        .btn-primary-cta:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 32px rgba(245, 166, 35, 0.45);
            color: #1a1a2e;
        }
        .btn-primary-cta:active {
            transform: translateY(0);
        }
        .btn-outline-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            background: transparent;
            color: #fff;
            font-weight: 600;
            font-size: 1.05rem;
            border-radius: var(--radius-full);
            border: 2px solid rgba(255, 255, 255, 0.35);
            transition: all var(--transition-fast);
        }
        .btn-outline-cta:hover {
            border-color: #fff;
            background: rgba(255, 255, 255, 0.08);
            color: #fff;
            transform: translateY(-3px);
        }
        @media (max-width: 520px) {
            .cta-section h2 {
                font-size: 1.4rem;
            }
            .cta-section p {
                font-size: 0.95rem;
            }
            .btn-primary-cta,
            .btn-outline-cta {
                padding: 12px 24px;
                font-size: 0.95rem;
            }
        }

        /* ========== FOOTER ========== */
        .site-footer {
            background: var(--color-dark-surface);
            color: rgba(255, 255, 255, 0.75);
            padding: 52px 0 28px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
        }
        .site-footer .container {
            max-width: var(--container-max);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 36px;
        }
        .footer-brand {
            font-size: 1.2rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .footer-desc {
            font-size: 0.9rem;
            line-height: 1.7;
            color: rgba(255, 255, 255, 0.55);
            max-width: 320px;
        }
        .footer-col h4 {
            font-size: 0.95rem;
            font-weight: 600;
            color: #fff;
            margin-bottom: 14px;
            letter-spacing: 0.01em;
        }
        .footer-col ul {
            list-style: none;
        }
        .footer-col ul li {
            margin-bottom: 8px;
            font-size: 0.9rem;
        }
        .footer-col ul li a {
            color: rgba(255, 255, 255, 0.6);
            transition: color var(--transition-fast);
        }
        .footer-col ul li a:hover {
            color: var(--color-accent-light);
        }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 10px;
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            font-size: 0.82rem;
            color: rgba(255, 255, 255, 0.4);
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, 0.45);
        }
        .footer-bottom a:hover {
            color: rgba(255, 255, 255, 0.75);
        }
        @media (max-width: 860px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
        }
        @media (max-width: 520px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .footer-desc {
                max-width: 100%;
            }
        }

/* roulang page: category1 */
/* ========== 设计变量 ========== */
        :root {
            --color-primary: #f0c040;
            --color-primary-dark: #c9a030;
            --color-primary-light: #f5d878;
            --color-primary-glow: rgba(240, 192, 64, 0.25);
            --color-secondary: #1a1f3a;
            --color-secondary-light: #232b4d;
            --color-accent: #4da8da;
            --color-accent-dark: #3888b8;
            --color-bg: #0a0e1a;
            --color-bg-alt: #0d1125;
            --color-surface: #151b2e;
            --color-surface-hover: #1c2340;
            --color-surface-elevated: #1e2545;
            --color-text: #e8e8f0;
            --color-text-secondary: #c0c5d8;
            --color-text-muted: #8899aa;
            --color-border: #2a3050;
            --color-border-light: #353d60;
            --color-success: #4caf84;
            --color-success-bg: rgba(76, 175, 132, 0.12);
            --color-warning: #f0a040;
            --color-warning-bg: rgba(240, 160, 64, 0.12);
            --color-danger: #e05555;
            --color-danger-bg: rgba(224, 85, 85, 0.12);
            --color-info: #4da8da;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
            --shadow-md: 0 4px 24px rgba(0, 0, 0, 0.35);
            --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
            --shadow-glow: 0 0 30px rgba(240, 192, 64, 0.2);
            --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
            --font-mono: 'SF Mono', 'Cascadia Code', 'Consolas', 'Monaco', monospace;
            --transition-fast: 0.18s ease;
            --transition-base: 0.28s ease;
            --transition-slow: 0.4s ease;
            --container-max: 1200px;
            --container-padding: 24px;
            --nav-height: 68px;
        }

        /* ========== 基础 Reset ========== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            font-size: 16px;
        }

        body {
            font-family: var(--font-sans);
            line-height: 1.7;
            color: var(--color-text);
            background-color: var(--color-bg);
            min-height: 100vh;
            overflow-x: hidden;
            letter-spacing: 0.01em;
        }

        a {
            color: var(--color-accent);
            text-decoration: none;
            transition: color var(--transition-fast), opacity var(--transition-fast);
        }
        a:hover {
            color: #6dbde8;
            text-decoration: none;
        }

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

        button {
            cursor: pointer;
            font-family: inherit;
            border: none;
            outline: none;
        }
        button:focus-visible,
        a:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--color-primary);
            outline-offset: 3px;
            border-radius: 4px;
        }

        ul,
        ol {
            list-style: none;
        }

        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            color: var(--color-text);
            font-weight: 700;
        }

        /* ========== 容器 ========== */
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 var(--container-padding);
            width: 100%;
        }

        /* ========== 导航 Header ========== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(15, 18, 35, 0.92);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--color-border);
            height: var(--nav-height);
            display: flex;
            align-items: center;
            transition: background var(--transition-base), box-shadow var(--transition-base);
        }
        .site-header.scrolled {
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.5);
            background: rgba(15, 18, 35, 0.97);
        }

        .navbar {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            gap: 20px;
        }

        .navbar-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--color-text);
            white-space: nowrap;
            letter-spacing: 0.03em;
            transition: color var(--transition-fast);
            text-decoration: none;
        }
        .navbar-brand:hover {
            color: var(--color-primary);
            text-decoration: none;
        }
        .brand-icon {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            border-radius: var(--radius-sm);
            background: linear-gradient(135deg, var(--color-primary), #e0a820);
            color: #1a1a1a;
            font-size: 1rem;
            flex-shrink: 0;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 6px;
            flex-wrap: nowrap;
        }
        .nav-links li a {
            display: flex;
            align-items: center;
            gap: 7px;
            padding: 10px 16px;
            border-radius: var(--radius-sm);
            color: var(--color-text-secondary);
            font-weight: 500;
            font-size: 0.95rem;
            transition: color var(--transition-fast), background var(--transition-fast);
            white-space: nowrap;
            text-decoration: none;
        }
        .nav-links li a:hover {
            color: var(--color-text);
            background: rgba(255, 255, 255, 0.05);
            text-decoration: none;
        }
        .nav-links li a.active {
            color: var(--color-primary);
            background: var(--color-primary-glow);
            font-weight: 600;
        }
        .nav-links li a.nav-cta {
            background: linear-gradient(135deg, var(--color-primary), #e0a820);
            color: #1a1a1a;
            font-weight: 600;
            padding: 10px 20px;
            border-radius: 24px;
            margin-left: 8px;
            transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
        }
        .nav-links li a.nav-cta:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-glow);
            color: #1a1a1a;
            background: linear-gradient(135deg, #f5d060, #f0c040);
            text-decoration: none;
        }

        .navbar-toggler {
            display: none;
            background: transparent;
            color: var(--color-text);
            font-size: 1.5rem;
            padding: 8px;
            border-radius: var(--radius-sm);
            transition: background var(--transition-fast);
            line-height: 1;
        }
        .navbar-toggler:hover {
            background: rgba(255, 255, 255, 0.08);
        }

        /* ========== 分类 Banner ========== */
        .category-banner {
            position: relative;
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            min-height: 380px;
            display: flex;
            align-items: center;
            overflow: hidden;
        }
        .category-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg,
                    rgba(10, 14, 26, 0.6) 0%,
                    rgba(10, 14, 26, 0.78) 40%,
                    rgba(10, 14, 26, 0.9) 100%);
            z-index: 1;
        }
        .category-banner::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background:
                radial-gradient(ellipse at 30% 20%, rgba(240, 192, 64, 0.08) 0%, transparent 60%),
                radial-gradient(ellipse at 70% 60%, rgba(77, 168, 218, 0.06) 0%, transparent 55%);
            z-index: 1;
            pointer-events: none;
        }
        .category-banner .container {
            position: relative;
            z-index: 2;
            padding-top: 50px;
            padding-bottom: 50px;
        }
        .breadcrumb-nav {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.9rem;
            color: var(--color-text-muted);
            margin-bottom: 16px;
            flex-wrap: wrap;
        }
        .breadcrumb-nav a {
            color: var(--color-text-muted);
            transition: color var(--transition-fast);
        }
        .breadcrumb-nav a:hover {
            color: var(--color-primary);
        }
        .breadcrumb-nav .separator {
            color: var(--color-text-muted);
            opacity: 0.5;
            font-size: 0.75rem;
        }
        .breadcrumb-nav .current {
            color: var(--color-primary);
            font-weight: 500;
        }
        .category-banner h1 {
            font-size: 2.8rem;
            font-weight: 800;
            color: #ffffff;
            margin-bottom: 12px;
            letter-spacing: 0.02em;
            text-shadow: 0 2px 12px rgba(0, 0, 0, 0.5);
        }
        .category-banner .banner-subtitle {
            font-size: 1.15rem;
            color: var(--color-text-secondary);
            max-width: 620px;
            line-height: 1.6;
        }
        .banner-badges {
            display: flex;
            gap: 14px;
            margin-top: 20px;
            flex-wrap: wrap;
        }
        .banner-badge {
            display: inline-flex;
            align-items: center;
            gap: 7px;
            padding: 8px 16px;
            border-radius: 20px;
            font-size: 0.88rem;
            font-weight: 500;
            background: rgba(255, 255, 255, 0.07);
            color: var(--color-text-secondary);
            border: 1px solid rgba(255, 255, 255, 0.1);
            backdrop-filter: blur(6px);
        }
        .banner-badge i {
            color: var(--color-primary);
            font-size: 0.85rem;
        }

        /* ========== 实时安全状态条 ========== */
        .status-bar-section {
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
        }
        .status-bar-inner {
            display: flex;
            align-items: center;
            gap: 16px;
            padding: 14px 0;
            flex-wrap: wrap;
        }
        .status-indicator {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 8px 18px;
            border-radius: 24px;
            background: var(--color-success-bg);
            border: 1px solid rgba(76, 175, 132, 0.25);
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--color-success);
        }
        .status-dot {
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background: var(--color-success);
            animation: statusPulse 2s ease-in-out infinite;
            box-shadow: 0 0 10px rgba(76, 175, 132, 0.6);
        }
        @keyframes statusPulse {
            0%,
            100% {
                box-shadow: 0 0 6px rgba(76, 175, 132, 0.4);
            }
            50% {
                box-shadow: 0 0 18px rgba(76, 175, 132, 0.9);
            }
        }
        .status-info {
            font-size: 0.9rem;
            color: var(--color-text-muted);
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .status-info span {
            color: var(--color-text-secondary);
            font-weight: 500;
        }

        /* ========== 板块通用样式 ========== */
        .section {
            padding: 70px 0;
        }
        .section-alt {
            background: var(--color-bg-alt);
        }
        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-header h2 {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 10px;
            color: #ffffff;
        }
        .section-header .section-subtitle {
            font-size: 1rem;
            color: var(--color-text-muted);
            max-width: 560px;
            margin: 0 auto;
        }
        .section-tag {
            display: inline-block;
            padding: 5px 14px;
            border-radius: 16px;
            font-size: 0.82rem;
            font-weight: 600;
            letter-spacing: 0.04em;
            text-transform: uppercase;
            margin-bottom: 12px;
            background: var(--color-primary-glow);
            color: var(--color-primary);
        }

        /* ========== 安全等级卡片网格 ========== */
        .level-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .level-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            padding: 28px 24px;
            transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
            position: relative;
            overflow: hidden;
        }
        .level-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
        }
        .level-card.level-basic::before {
            background: #4caf84;
        }
        .level-card.level-advanced::before {
            background: #4da8da;
        }
        .level-card.level-pro::before {
            background: #f0a040;
        }
        .level-card.level-enterprise::before {
            background: #f0c040;
        }
        .level-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
            border-color: var(--color-border-light);
        }
        .level-card .level-icon {
            width: 50px;
            height: 50px;
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            margin-bottom: 16px;
        }
        .level-basic .level-icon {
            background: var(--color-success-bg);
            color: var(--color-success);
        }
        .level-advanced .level-icon {
            background: rgba(77, 168, 218, 0.12);
            color: var(--color-info);
        }
        .level-pro .level-icon {
            background: var(--color-warning-bg);
            color: var(--color-warning);
        }
        .level-enterprise .level-icon {
            background: var(--color-primary-glow);
            color: var(--color-primary);
        }
        .level-card h3 {
            font-size: 1.15rem;
            margin-bottom: 8px;
            color: #ffffff;
        }
        .level-card .level-desc {
            font-size: 0.9rem;
            color: var(--color-text-muted);
            margin-bottom: 14px;
            line-height: 1.5;
        }
        .level-card .level-features {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 7px;
        }
        .level-card .level-features li {
            font-size: 0.85rem;
            color: var(--color-text-secondary);
            display: flex;
            align-items: flex-start;
            gap: 7px;
            line-height: 1.4;
        }
        .level-card .level-features li i {
            color: var(--color-success);
            font-size: 0.75rem;
            margin-top: 3px;
            flex-shrink: 0;
        }
        .level-rank {
            position: absolute;
            top: 16px;
            right: 16px;
            font-size: 0.78rem;
            font-weight: 700;
            color: var(--color-text-muted);
            opacity: 0.5;
            letter-spacing: 0.05em;
        }

        /* ========== 文章卡片网格 ========== */
        .articles-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .article-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
            display: flex;
            flex-direction: column;
        }
        .article-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-lg);
            border-color: var(--color-border-light);
        }
        .article-card .card-img-wrap {
            position: relative;
            overflow: hidden;
            aspect-ratio: 16 / 10;
            background: var(--color-secondary);
        }
        .article-card .card-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform var(--transition-slow);
        }
        .article-card:hover .card-img-wrap img {
            transform: scale(1.06);
        }
        .article-card .card-img-wrap .card-tag {
            position: absolute;
            top: 14px;
            left: 14px;
            padding: 5px 12px;
            border-radius: 14px;
            font-size: 0.78rem;
            font-weight: 600;
            background: rgba(0, 0, 0, 0.65);
            color: var(--color-primary);
            backdrop-filter: blur(8px);
            letter-spacing: 0.03em;
        }
        .article-card .card-body {
            padding: 20px 22px 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .article-card .card-body h3 {
            font-size: 1.08rem;
            font-weight: 700;
            margin-bottom: 8px;
            color: #ffffff;
            line-height: 1.4;
        }
        .article-card .card-body .card-excerpt {
            font-size: 0.9rem;
            color: var(--color-text-muted);
            line-height: 1.55;
            margin-bottom: 16px;
            flex: 1;
        }
        .article-card .card-body .card-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 0.82rem;
            color: var(--color-text-muted);
            padding-top: 14px;
            border-top: 1px solid var(--color-border);
        }
        .article-card .card-body .card-meta .read-more {
            color: var(--color-primary);
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 4px;
            transition: gap var(--transition-fast), color var(--transition-fast);
            text-decoration: none;
        }
        .article-card .card-body .card-meta .read-more:hover {
            gap: 8px;
            color: var(--color-primary-light);
            text-decoration: none;
        }

        /* ========== 安全流程时间线 ========== */
        .process-timeline {
            display: flex;
            gap: 0;
            position: relative;
            flex-wrap: nowrap;
            justify-content: space-between;
        }
        .process-step {
            flex: 1;
            text-align: center;
            position: relative;
            padding: 0 16px;
            min-width: 0;
        }
        .process-step .step-number {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            margin: 0 auto 16px;
            font-size: 1.3rem;
            font-weight: 700;
            color: #1a1a1a;
            background: linear-gradient(135deg, var(--color-primary), #e0a820);
            position: relative;
            z-index: 2;
            box-shadow: var(--shadow-glow);
        }
        .process-step .step-connector {
            position: absolute;
            top: 28px;
            left: calc(50% + 28px);
            width: calc(100% - 56px);
            height: 2px;
            background: var(--color-border);
            z-index: 1;
        }
        .process-step:last-child .step-connector {
            display: none;
        }
        .process-step h4 {
            font-size: 1rem;
            color: #ffffff;
            margin-bottom: 6px;
        }
        .process-step p {
            font-size: 0.85rem;
            color: var(--color-text-muted);
            line-height: 1.5;
        }

        /* ========== 数据统计 ========== */
        .stats-row {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .stat-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            padding: 28px 22px;
            text-align: center;
            transition: transform var(--transition-base), box-shadow var(--transition-base);
        }
        .stat-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .stat-card .stat-number {
            font-size: 2.6rem;
            font-weight: 800;
            color: var(--color-primary);
            letter-spacing: -0.02em;
            line-height: 1;
            margin-bottom: 8px;
        }
        .stat-card .stat-label {
            font-size: 0.9rem;
            color: var(--color-text-muted);
            font-weight: 500;
        }
        .stat-card .stat-icon {
            font-size: 1.8rem;
            margin-bottom: 10px;
            color: var(--color-accent);
        }

        /* ========== 安全提示横幅 ========== */
        .tips-banner {
            background: var(--color-surface-elevated);
            border: 1px solid var(--color-border-light);
            border-radius: var(--radius-xl);
            padding: 36px 32px;
            display: flex;
            align-items: center;
            gap: 28px;
            flex-wrap: wrap;
        }
        .tips-banner .tips-icon-wrap {
            flex-shrink: 0;
            width: 64px;
            height: 64px;
            border-radius: 50%;
            background: var(--color-warning-bg);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.6rem;
            color: var(--color-warning);
        }
        .tips-banner .tips-content h3 {
            font-size: 1.2rem;
            color: #ffffff;
            margin-bottom: 4px;
        }
        .tips-banner .tips-content p {
            font-size: 0.92rem;
            color: var(--color-text-muted);
            line-height: 1.5;
        }

        /* ========== FAQ 手风琴 ========== */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
            max-width: 800px;
            margin: 0 auto;
        }
        .faq-item {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
        }
        .faq-item.open {
            border-color: var(--color-border-light);
            box-shadow: var(--shadow-md);
        }
        .faq-question {
            width: 100%;
            background: transparent;
            color: var(--color-text);
            padding: 18px 22px;
            font-size: 1rem;
            font-weight: 600;
            text-align: left;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 14px;
            transition: color var(--transition-fast);
            cursor: pointer;
        }
        .faq-question:hover {
            color: var(--color-primary);
        }
        .faq-question .faq-icon {
            flex-shrink: 0;
            transition: transform var(--transition-base);
            color: var(--color-text-muted);
            font-size: 0.85rem;
        }
        .faq-item.open .faq-question .faq-icon {
            transform: rotate(180deg);
            color: var(--color-primary);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-slow), padding var(--transition-slow);
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
        }
        .faq-answer-inner {
            padding: 0 22px 18px;
            font-size: 0.92rem;
            color: var(--color-text-muted);
            line-height: 1.65;
        }

        /* ========== CTA 区域 ========== */
        .cta-section {
            background: var(--color-surface-elevated);
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 50% 30%, rgba(240, 192, 64, 0.07) 0%, transparent 70%);
            pointer-events: none;
        }
        .cta-inner {
            position: relative;
            z-index: 1;
            text-align: center;
            padding: 60px 0;
        }
        .cta-inner h2 {
            font-size: 2.2rem;
            font-weight: 800;
            color: #ffffff;
            margin-bottom: 12px;
        }
        .cta-inner .cta-desc {
            font-size: 1.05rem;
            color: var(--color-text-muted);
            margin-bottom: 28px;
        }
        .btn-primary-cta {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 15px 36px;
            border-radius: 28px;
            font-size: 1.05rem;
            font-weight: 700;
            background: linear-gradient(135deg, var(--color-primary), #e0a820);
            color: #1a1a1a;
            transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
            text-decoration: none;
            letter-spacing: 0.02em;
        }
        .btn-primary-cta:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-glow);
            color: #1a1a1a;
            background: linear-gradient(135deg, #f5d878, #f0c040);
            text-decoration: none;
        }
        .cta-secondary-links {
            margin-top: 20px;
            display: flex;
            gap: 24px;
            justify-content: center;
            flex-wrap: wrap;
        }
        .cta-secondary-links a {
            color: var(--color-text-muted);
            font-size: 0.9rem;
            transition: color var(--transition-fast);
        }
        .cta-secondary-links a:hover {
            color: var(--color-primary);
        }

        /* ========== 页脚 Footer ========== */
        .site-footer {
            background: var(--color-secondary);
            border-top: 1px solid var(--color-border);
            padding: 56px 0 28px;
            color: var(--color-text-secondary);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 36px;
            margin-bottom: 36px;
        }
        .footer-brand {
            font-size: 1.2rem;
            font-weight: 700;
            color: #ffffff;
            display: flex;
            align-items: center;
            gap: 8px;
            margin-bottom: 12px;
        }
        .footer-brand i {
            color: var(--color-primary);
        }
        .footer-desc {
            font-size: 0.88rem;
            color: var(--color-text-muted);
            line-height: 1.6;
        }
        .footer-col h4 {
            font-size: 0.95rem;
            font-weight: 600;
            color: #ffffff;
            margin-bottom: 14px;
            letter-spacing: 0.02em;
        }
        .footer-col ul {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .footer-col ul li {
            font-size: 0.88rem;
            color: var(--color-text-muted);
        }
        .footer-col ul li a {
            color: var(--color-text-muted);
            transition: color var(--transition-fast);
        }
        .footer-col ul li a:hover {
            color: var(--color-primary);
        }
        .footer-bottom {
            border-top: 1px solid var(--color-border);
            padding-top: 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.84rem;
            color: var(--color-text-muted);
        }
        .footer-bottom a {
            color: var(--color-text-muted);
            transition: color var(--transition-fast);
        }
        .footer-bottom a:hover {
            color: var(--color-primary);
        }

        /* ========== 响应式 ========== */
        @media (max-width: 1024px) {
            .level-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .articles-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .stats-row {
                grid-template-columns: repeat(2, 1fr);
            }
            .process-timeline {
                flex-wrap: wrap;
                gap: 24px;
            }
            .process-step {
                flex: 0 0 calc(50% - 12px);
                padding: 0 8px;
            }
            .process-step .step-connector {
                display: none;
            }
            .process-step:nth-child(odd) .step-connector-mobile {
                display: block;
                position: absolute;
                top: 28px;
                left: calc(50% + 28px);
                width: calc(100% - 28px);
                height: 2px;
                background: var(--color-border);
                z-index: 1;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }
            .category-banner h1 {
                font-size: 2.2rem;
            }
            .section {
                padding: 50px 0;
            }
        }

        @media (max-width: 768px) {
            .navbar-toggler {
                display: flex;
                align-items: center;
                justify-content: center;
            }
            .nav-links {
                position: fixed;
                top: var(--nav-height);
                left: 0;
                right: 0;
                background: rgba(15, 18, 35, 0.97);
                backdrop-filter: blur(20px);
                -webkit-backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 16px 20px;
                gap: 4px;
                border-bottom: 1px solid var(--color-border);
                display: none;
                z-index: 999;
            }
            .nav-links.open {
                display: flex;
            }
            .nav-links li {
                width: 100%;
            }
            .nav-links li a {
                width: 100%;
                padding: 13px 16px;
                border-radius: var(--radius-sm);
                justify-content: flex-start;
            }
            .nav-links li a.nav-cta {
                margin-left: 0;
                justify-content: center;
                margin-top: 4px;
            }
            .level-grid {
                grid-template-columns: 1fr 1fr;
                gap: 14px;
            }
            .articles-grid {
                grid-template-columns: 1fr;
                gap: 18px;
            }
            .stats-row {
                grid-template-columns: 1fr 1fr;
                gap: 14px;
            }
            .process-timeline {
                flex-direction: column;
                gap: 0;
            }
            .process-step {
                flex: 1;
                display: flex;
                align-items: flex-start;
                gap: 16px;
                text-align: left;
                padding: 12px 0;
                border-left: 2px solid var(--color-border);
                padding-left: 20px;
                position: relative;
            }
            .process-step .step-number {
                margin: 0;
                width: 44px;
                height: 44px;
                font-size: 1rem;
                flex-shrink: 0;
            }
            .process-step .step-connector {
                display: none;
            }
            .category-banner {
                min-height: 280px;
            }
            .category-banner h1 {
                font-size: 1.8rem;
            }
            .category-banner .banner-subtitle {
                font-size: 0.95rem;
            }
            .tips-banner {
                flex-direction: column;
                text-align: center;
                padding: 24px 20px;
            }
            .section-header h2 {
                font-size: 1.5rem;
            }
            .section {
                padding: 40px 0;
            }
            .cta-inner h2 {
                font-size: 1.6rem;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .banner-badges {
                gap: 8px;
            }
            .banner-badge {
                font-size: 0.8rem;
                padding: 6px 12px;
            }
        }

        @media (max-width: 520px) {
            .level-grid {
                grid-template-columns: 1fr;
            }
            .stats-row {
                grid-template-columns: 1fr;
            }
            .category-banner h1 {
                font-size: 1.5rem;
            }
            .category-banner {
                min-height: 240px;
            }
            .stat-card .stat-number {
                font-size: 2rem;
            }
            .btn-primary-cta {
                padding: 13px 24px;
                font-size: 0.95rem;
                width: 100%;
                justify-content: center;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .navbar-brand {
                font-size: 1.05rem;
            }
            .brand-icon {
                width: 32px;
                height: 32px;
                font-size: 0.85rem;
            }
        }