/* roulang page: index */
/* ===== Design Variables ===== */
        :root {
            --primary: #00c8ff;
            --primary-dark: #0099cc;
            --primary-glow: rgba(0, 200, 255, 0.35);
            --secondary: #8b5cf6;
            --secondary-glow: rgba(139, 92, 246, 0.30);
            --accent: #f59e0b;
            --accent-glow: rgba(245, 158, 11, 0.25);
            --bg-deep: #080c18;
            --bg-dark: #0f1422;
            --bg-card: #161b2b;
            --bg-card-hover: #1c2238;
            --bg-surface: #1a2035;
            --text-primary: #f0f4ff;
            --text-secondary: #b0bcd6;
            --text-muted: #6b7a99;
            --border-color: rgba(0, 200, 255, 0.15);
            --border-glow: rgba(0, 200, 255, 0.30);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 22px;
            --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.45), 0 0 0 1px rgba(0, 200, 255, 0.06);
            --shadow-glow: 0 0 40px rgba(0, 200, 255, 0.10);
            --shadow-glow-lg: 0 0 70px rgba(0, 200, 255, 0.08);
            --transition: 0.30s cubic-bezier(0.4, 0, 0.2, 1);
            --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
            --max-width: 1200px;
            --header-height: 72px;
        }

        /* ===== Reset & Base ===== */
        *,
        *::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-family);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-deep);
            min-height: 100vh;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: #66e0ff;
        }
        a:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 3px;
            border-radius: 4px;
        }
        button {
            font-family: inherit;
            cursor: pointer;
            border: none;
            background: none;
            font-size: inherit;
        }
        button:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 3px;
            border-radius: 6px;
        }
        input {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.25;
            font-weight: 700;
            color: var(--text-primary);
        }
        h1 {
            font-size: clamp(2.4rem, 6vw, 3.8rem);
        }
        h2 {
            font-size: clamp(1.8rem, 4vw, 2.8rem);
        }
        h3 {
            font-size: clamp(1.2rem, 2.5vw, 1.6rem);
        }
        p {
            color: var(--text-secondary);
            margin-bottom: 1rem;
        }
        p:last-child {
            margin-bottom: 0;
        }

        /* ===== Container ===== */
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 768px) {
            .container {
                padding: 0 16px;
            }
        }

        /* ===== Section ===== */
        .section {
            padding: 80px 0;
        }
        .section-title {
            text-align: center;
            margin-bottom: 16px;
        }
        .section-subtitle {
            text-align: center;
            font-size: 1.1rem;
            color: var(--text-secondary);
            max-width: 640px;
            margin: 0 auto 48px auto;
        }
        .section-divider {
            width: 60px;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            border-radius: 4px;
            margin: 12px auto 8px auto;
        }
        @media (max-width: 768px) {
            .section {
                padding: 56px 0;
            }
            .section-subtitle {
                margin-bottom: 32px;
                font-size: 1rem;
            }
        }

        /* ===== Header & Navigation ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-height);
            background: rgba(8, 12, 24, 0.88);
            backdrop-filter: blur(18px) saturate(1.4);
            border-bottom: 1px solid var(--border-color);
            box-shadow: 0 4px 30px rgba(0, 0, 0, 0.4);
            transition: background var(--transition), box-shadow var(--transition);
        }
        .site-header.scrolled {
            background: rgba(6, 9, 18, 0.96);
            box-shadow: 0 4px 40px rgba(0, 0, 0, 0.6);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--text-primary);
            letter-spacing: 0.5px;
            white-space: nowrap;
        }
        .logo-icon {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            color: #fff;
            box-shadow: 0 0 24px var(--primary-glow);
            flex-shrink: 0;
        }
        .logo span {
            background: linear-gradient(90deg, var(--text-primary), var(--primary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .main-nav a {
            padding: 8px 18px;
            border-radius: 40px;
            font-size: 0.92rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: all var(--transition);
            position: relative;
            letter-spacing: 0.3px;
        }
        .main-nav a:hover {
            color: var(--text-primary);
            background: rgba(0, 200, 255, 0.08);
        }
        .main-nav a.active {
            color: #fff;
            background: linear-gradient(135deg, rgba(0, 200, 255, 0.18), rgba(139, 92, 246, 0.12));
            box-shadow: 0 0 20px rgba(0, 200, 255, 0.10), inset 0 0 20px rgba(0, 200, 255, 0.04);
            border: 1px solid rgba(0, 200, 255, 0.20);
        }
        .main-nav a.active::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 50%;
            transform: translateX(-50%);
            width: 40%;
            height: 2px;
            background: var(--primary);
            border-radius: 2px;
            box-shadow: 0 0 16px var(--primary-glow);
        }
        .nav-cta {
            padding: 8px 22px !important;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark)) !important;
            color: #fff !important;
            border-radius: 40px !important;
            font-weight: 600 !important;
            box-shadow: 0 0 28px rgba(0, 200, 255, 0.20);
            border: 1px solid rgba(0, 200, 255, 0.30) !important;
        }
        .nav-cta:hover {
            transform: translateY(-2px) scale(1.02);
            box-shadow: 0 0 40px rgba(0, 200, 255, 0.35) !important;
            background: linear-gradient(135deg, #33d4ff, #00aadd) !important;
        }
        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
            cursor: pointer;
            background: none;
            border: none;
        }
        .nav-toggle span {
            display: block;
            width: 26px;
            height: 2px;
            background: var(--text-primary);
            border-radius: 4px;
            transition: all var(--transition);
        }
        .nav-toggle.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .nav-toggle.active span:nth-child(2) {
            opacity: 0;
            transform: scaleX(0);
        }
        .nav-toggle.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }
        @media (max-width: 820px) {
            .nav-toggle {
                display: flex;
            }
            .main-nav {
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                flex-direction: column;
                background: rgba(8, 12, 24, 0.98);
                backdrop-filter: blur(24px);
                padding: 20px 24px 28px;
                gap: 6px;
                border-bottom: 1px solid var(--border-color);
                transform: translateY(-110%);
                opacity: 0;
                pointer-events: none;
                transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
                box-shadow: 0 20px 60px rgba(0, 0, 0, 0.6);
            }
            .main-nav.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .main-nav a {
                padding: 12px 20px;
                font-size: 1rem;
                width: 100%;
                text-align: center;
                border-radius: 12px;
            }
            .main-nav a.active::after {
                display: none;
            }
            .main-nav a.active {
                background: linear-gradient(135deg, rgba(0, 200, 255, 0.15), rgba(139, 92, 246, 0.10));
            }
            .nav-cta {
                margin-top: 6px;
                text-align: center;
            }
        }
        @media (max-width: 480px) {
            .logo {
                font-size: 1.1rem;
                gap: 8px;
            }
            .logo-icon {
                width: 30px;
                height: 30px;
                font-size: 0.9rem;
            }
            .header-inner {
                padding: 0 12px;
            }
        }

        /* ===== Hero ===== */
        .hero {
            position: relative;
            min-height: 92vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 120px 0 80px;
            overflow: hidden;
            background: var(--bg-deep);
        }
        .hero-bg {
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.25;
            z-index: 0;
            animation: heroZoom 20s ease-in-out infinite alternate;
        }
        @keyframes heroZoom {
            0% {
                transform: scale(1.0);
            }
            100% {
                transform: scale(1.08);
            }
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 50% 40%, rgba(8, 12, 24, 0.40) 0%, var(--bg-deep) 85%);
            z-index: 1;
        }
        .hero-glow {
            position: absolute;
            top: -20%;
            left: 50%;
            transform: translateX(-50%);
            width: 800px;
            height: 600px;
            background: radial-gradient(circle, rgba(0, 200, 255, 0.06) 0%, transparent 70%);
            z-index: 1;
            pointer-events: none;
        }
        .hero-content {
            position: relative;
            z-index: 2;
            text-align: center;
            max-width: 820px;
            padding: 0 24px;
        }
        .hero-badge {
            display: inline-block;
            padding: 6px 20px;
            border-radius: 40px;
            background: rgba(0, 200, 255, 0.10);
            border: 1px solid rgba(0, 200, 255, 0.20);
            font-size: 0.85rem;
            color: var(--primary);
            letter-spacing: 0.5px;
            margin-bottom: 24px;
            backdrop-filter: blur(8px);
            box-shadow: 0 0 30px rgba(0, 200, 255, 0.05);
        }
        .hero h1 {
            font-size: clamp(2.6rem, 7vw, 4.2rem);
            font-weight: 800;
            line-height: 1.15;
            margin-bottom: 20px;
            background: linear-gradient(135deg, #ffffff 40%, var(--primary) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero p {
            font-size: clamp(1.05rem, 2vw, 1.3rem);
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto 36px;
            line-height: 1.7;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 32px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 1rem;
            letter-spacing: 0.3px;
            transition: all var(--transition);
            border: none;
            cursor: pointer;
        }
        .btn i {
            font-size: 0.9em;
        }
        .btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #fff;
            box-shadow: 0 0 30px rgba(0, 200, 255, 0.25);
            border: 1px solid rgba(0, 200, 255, 0.30);
        }
        .btn-primary:hover {
            transform: translateY(-3px) scale(1.02);
            box-shadow: 0 0 50px rgba(0, 200, 255, 0.40);
            color: #fff;
        }
        .btn-secondary {
            background: rgba(255, 255, 255, 0.06);
            color: var(--text-primary);
            border: 1px solid rgba(255, 255, 255, 0.12);
            backdrop-filter: blur(8px);
        }
        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.12);
            border-color: rgba(255, 255, 255, 0.20);
            transform: translateY(-3px);
            color: var(--text-primary);
        }
        .hero-stats {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 32px 48px;
            margin-top: 56px;
            padding-top: 40px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
        }
        .hero-stat {
            text-align: center;
        }
        .hero-stat-number {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--text-primary);
            letter-spacing: 0.5px;
        }
        .hero-stat-number i {
            color: var(--primary);
            font-size: 1.2rem;
            margin-right: 4px;
        }
        .hero-stat-label {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-top: 2px;
        }
        @media (max-width: 768px) {
            .hero {
                min-height: 80vh;
                padding: 100px 0 60px;
            }
            .hero-stats {
                gap: 20px 32px;
                margin-top: 40px;
                padding-top: 28px;
            }
            .hero-stat-number {
                font-size: 1.4rem;
            }
            .btn {
                padding: 12px 26px;
                font-size: 0.95rem;
            }
        }
        @media (max-width: 480px) {
            .hero-actions {
                flex-direction: column;
                align-items: center;
            }
            .btn {
                width: 100%;
                max-width: 280px;
                justify-content: center;
            }
        }

        /* ===== Intro Section ===== */
        .intro-section {
            background: var(--bg-dark);
            position: relative;
        }
        .intro-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }
        .intro-image {
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-color);
            position: relative;
        }
        .intro-image img {
            width: 100%;
            height: 360px;
            object-fit: cover;
            transition: transform 0.6s ease;
        }
        .intro-image:hover img {
            transform: scale(1.03);
        }
        .intro-image::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(0, 200, 255, 0.05), transparent 60%);
            pointer-events: none;
        }
        .intro-text h2 {
            margin-bottom: 16px;
        }
        .intro-text p {
            font-size: 1.05rem;
            line-height: 1.8;
            margin-bottom: 20px;
        }
        .intro-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 20px;
        }
        .tag {
            display: inline-block;
            padding: 5px 16px;
            border-radius: 30px;
            font-size: 0.82rem;
            font-weight: 500;
            background: rgba(0, 200, 255, 0.08);
            color: var(--primary);
            border: 1px solid rgba(0, 200, 255, 0.12);
            transition: all var(--transition);
        }
        .tag:hover {
            background: rgba(0, 200, 255, 0.16);
            border-color: rgba(0, 200, 255, 0.25);
            transform: translateY(-1px);
        }
        @media (max-width: 820px) {
            .intro-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .intro-image img {
                height: 260px;
            }
        }

        /* ===== Features Section ===== */
        .features-section {
            background: var(--bg-deep);
            position: relative;
        }
        .features-section::before {
            content: '';
            position: absolute;
            top: -120px;
            left: 0;
            right: 0;
            height: 240px;
            background: radial-gradient(ellipse at 50% 0%, rgba(0, 200, 255, 0.03), transparent 70%);
            pointer-events: none;
        }
        .features-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .feature-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 32px 24px 28px;
            text-align: center;
            border: 1px solid var(--border-color);
            transition: all var(--transition);
            box-shadow: var(--shadow-card);
            position: relative;
            overflow: hidden;
        }
        .feature-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            opacity: 0;
            transition: opacity var(--transition);
        }
        .feature-card:hover::before {
            opacity: 1;
        }
        .feature-card:hover {
            transform: translateY(-6px);
            border-color: rgba(0, 200, 255, 0.20);
            box-shadow: 0 16px 48px rgba(0, 0, 0, 0.5), 0 0 30px rgba(0, 200, 255, 0.06);
            background: var(--bg-card-hover);
        }
        .feature-icon {
            width: 60px;
            height: 60px;
            border-radius: 16px;
            margin: 0 auto 18px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            color: #fff;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            box-shadow: 0 0 30px rgba(0, 200, 255, 0.15);
        }
        .feature-card:nth-child(2) .feature-icon {
            background: linear-gradient(135deg, var(--secondary), #6d28d9);
            box-shadow: 0 0 30px rgba(139, 92, 246, 0.15);
        }
        .feature-card:nth-child(3) .feature-icon {
            background: linear-gradient(135deg, var(--accent), #d97706);
            box-shadow: 0 0 30px rgba(245, 158, 11, 0.15);
        }
        .feature-card:nth-child(4) .feature-icon {
            background: linear-gradient(135deg, #10b981, #059669);
            box-shadow: 0 0 30px rgba(16, 185, 129, 0.15);
        }
        .feature-card h3 {
            font-size: 1.15rem;
            margin-bottom: 10px;
        }
        .feature-card p {
            font-size: 0.92rem;
            color: var(--text-muted);
            line-height: 1.6;
        }
        @media (max-width: 1024px) {
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 520px) {
            .features-grid {
                grid-template-columns: 1fr;
            }
            .feature-card {
                padding: 24px 18px 22px;
            }
        }

        /* ===== Category Section ===== */
        .category-section {
            background: var(--bg-dark);
            position: relative;
        }
        .category-card {
            display: flex;
            align-items: center;
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-card);
            transition: all var(--transition);
        }
        .category-card:hover {
            transform: translateY(-4px);
            border-color: rgba(0, 200, 255, 0.18);
            box-shadow: 0 16px 50px rgba(0, 0, 0, 0.5), 0 0 30px rgba(0, 200, 255, 0.05);
        }
        .category-image {
            flex: 0 0 300px;
            height: 260px;
            overflow: hidden;
            position: relative;
        }
        .category-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.6s ease;
        }
        .category-card:hover .category-image img {
            transform: scale(1.05);
        }
        .category-image::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(90deg, transparent 60%, var(--bg-card));
            pointer-events: none;
        }
        .category-body {
            flex: 1;
            padding: 32px 36px;
        }
        .category-body .tag {
            margin-bottom: 12px;
            display: inline-block;
        }
        .category-body h3 {
            font-size: 1.5rem;
            margin-bottom: 12px;
        }
        .category-body p {
            color: var(--text-secondary);
            margin-bottom: 20px;
            font-size: 1rem;
            line-height: 1.7;
        }
        .category-body .btn i {
            transition: transform var(--transition);
        }
        .category-body .btn:hover i {
            transform: translateX(4px);
        }
        @media (max-width: 820px) {
            .category-card {
                flex-direction: column;
            }
            .category-image {
                flex: none;
                width: 100%;
                height: 200px;
            }
            .category-image::after {
                background: linear-gradient(0deg, var(--bg-card) 20%, transparent 60%);
            }
            .category-body {
                padding: 24px 28px;
            }
        }
        @media (max-width: 480px) {
            .category-body {
                padding: 20px;
            }
            .category-body h3 {
                font-size: 1.25rem;
            }
        }

        /* ===== Posts / CMS List Section ===== */
        .posts-section {
            background: var(--bg-deep);
            position: relative;
        }
        .posts-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .post-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--border-color);
            transition: all var(--transition);
            box-shadow: var(--shadow-card);
            display: flex;
            flex-direction: column;
        }
        .post-card:hover {
            transform: translateY(-5px);
            border-color: rgba(0, 200, 255, 0.18);
            box-shadow: 0 14px 44px rgba(0, 0, 0, 0.5), 0 0 24px rgba(0, 200, 255, 0.04);
            background: var(--bg-card-hover);
        }
        .post-thumb {
            height: 180px;
            overflow: hidden;
            position: relative;
            background: var(--bg-surface);
        }
        .post-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .post-card:hover .post-thumb img {
            transform: scale(1.06);
        }
        .post-category {
            position: absolute;
            top: 12px;
            left: 12px;
            padding: 4px 14px;
            border-radius: 30px;
            font-size: 0.75rem;
            font-weight: 600;
            background: rgba(0, 200, 255, 0.15);
            backdrop-filter: blur(8px);
            color: var(--primary);
            border: 1px solid rgba(0, 200, 255, 0.15);
        }
        .post-body {
            padding: 20px 22px 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .post-body h3 {
            font-size: 1.05rem;
            margin-bottom: 10px;
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .post-body h3 a {
            color: var(--text-primary);
            transition: color var(--transition);
        }
        .post-body h3 a:hover {
            color: var(--primary);
        }
        .post-excerpt {
            font-size: 0.88rem;
            color: var(--text-muted);
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-bottom: 14px;
            flex: 1;
        }
        .post-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 0.8rem;
            color: var(--text-muted);
            border-top: 1px solid rgba(255, 255, 255, 0.04);
            padding-top: 14px;
            margin-top: auto;
        }
        .post-meta span i {
            margin-right: 4px;
            font-size: 0.75rem;
        }
        .post-meta .post-date {
            color: var(--text-muted);
        }
        .posts-empty {
            grid-column: 1 / -1;
            text-align: center;
            padding: 60px 20px;
            color: var(--text-muted);
            font-size: 1.05rem;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px dashed var(--border-color);
        }
        .posts-empty i {
            font-size: 2.4rem;
            color: var(--primary);
            opacity: 0.3;
            margin-bottom: 16px;
            display: block;
        }
        @media (max-width: 1024px) {
            .posts-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 600px) {
            .posts-grid {
                grid-template-columns: 1fr;
            }
            .post-thumb {
                height: 200px;
            }
            .post-body {
                padding: 16px 18px 20px;
            }
        }

        /* ===== Stats / Data Section ===== */
        .stats-section {
            background: var(--bg-dark);
            position: relative;
            overflow: hidden;
        }
        .stats-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.04;
            pointer-events: none;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            position: relative;
            z-index: 1;
        }
        .stat-item {
            text-align: center;
            padding: 32px 20px;
            background: rgba(255, 255, 255, 0.02);
            border-radius: var(--radius-md);
            border: 1px solid rgba(255, 255, 255, 0.04);
            transition: all var(--transition);
        }
        .stat-item:hover {
            background: rgba(255, 255, 255, 0.04);
            border-color: rgba(0, 200, 255, 0.08);
            transform: translateY(-2px);
        }
        .stat-icon {
            font-size: 2rem;
            color: var(--primary);
            margin-bottom: 12px;
        }
        .stat-item:nth-child(2) .stat-icon {
            color: var(--secondary);
        }
        .stat-item:nth-child(3) .stat-icon {
            color: var(--accent);
        }
        .stat-item:nth-child(4) .stat-icon {
            color: #10b981;
        }
        .stat-number {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--text-primary);
            line-height: 1.2;
        }
        .stat-number span {
            font-size: 1rem;
            font-weight: 400;
            color: var(--text-muted);
            margin-left: 2px;
        }
        .stat-label {
            font-size: 0.9rem;
            color: var(--text-secondary);
            margin-top: 6px;
        }
        @media (max-width: 820px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 480px) {
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .stat-item {
                padding: 20px 12px;
            }
            .stat-number {
                font-size: 1.6rem;
            }
        }

        /* ===== Process / Steps Section ===== */
        .process-section {
            background: var(--bg-deep);
            position: relative;
        }
        .process-steps {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 32px;
            position: relative;
        }
        .process-steps::before {
            content: '';
            position: absolute;
            top: 50px;
            left: 15%;
            right: 15%;
            height: 2px;
            background: linear-gradient(90deg, var(--primary), var(--secondary), var(--primary));
            opacity: 0.15;
            z-index: 0;
        }
        .step {
            text-align: center;
            position: relative;
            z-index: 1;
        }
        .step-number {
            width: 56px;
            height: 56px;
            border-radius: 50%;
            margin: 0 auto 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            font-weight: 800;
            color: #fff;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            box-shadow: 0 0 30px rgba(0, 200, 255, 0.20);
            position: relative;
        }
        .step:nth-child(2) .step-number {
            background: linear-gradient(135deg, var(--secondary), #6d28d9);
            box-shadow: 0 0 30px rgba(139, 92, 246, 0.20);
        }
        .step:nth-child(3) .step-number {
            background: linear-gradient(135deg, var(--accent), #d97706);
            box-shadow: 0 0 30px rgba(245, 158, 11, 0.20);
        }
        .step h4 {
            font-size: 1.15rem;
            margin-bottom: 8px;
        }
        .step p {
            font-size: 0.92rem;
            color: var(--text-muted);
            line-height: 1.6;
            max-width: 260px;
            margin: 0 auto;
        }
        @media (max-width: 768px) {
            .process-steps {
                grid-template-columns: 1fr;
                gap: 36px;
            }
            .process-steps::before {
                display: none;
            }
            .step p {
                max-width: 100%;
            }
        }

        /* ===== FAQ Section ===== */
        .faq-section {
            background: var(--bg-dark);
            position: relative;
        }
        .faq-list {
            max-width: 780px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover {
            border-color: rgba(0, 200, 255, 0.12);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 24px;
            cursor: pointer;
            font-size: 1rem;
            font-weight: 600;
            color: var(--text-primary);
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            transition: background var(--transition);
            gap: 16px;
        }
        .faq-question:hover {
            background: rgba(255, 255, 255, 0.02);
        }
        .faq-question i {
            color: var(--primary);
            font-size: 1.1rem;
            transition: transform var(--transition);
            flex-shrink: 0;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
            padding: 0 24px;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }
        .faq-answer p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }
        @media (max-width: 600px) {
            .faq-question {
                padding: 14px 18px;
                font-size: 0.95rem;
            }
            .faq-answer {
                padding: 0 18px;
            }
            .faq-item.open .faq-answer {
                padding: 0 18px 16px;
            }
        }

        /* ===== CTA Section ===== */
        .cta-section {
            background: var(--bg-deep);
            position: relative;
            overflow: hidden;
            padding: 100px 0;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-3.png') center center / cover no-repeat;
            opacity: 0.05;
            pointer-events: none;
        }
        .cta-box {
            position: relative;
            z-index: 1;
            background: linear-gradient(135deg, rgba(0, 200, 255, 0.04), rgba(139, 92, 246, 0.04));
            border-radius: var(--radius-lg);
            padding: 60px 48px;
            text-align: center;
            border: 1px solid rgba(0, 200, 255, 0.08);
            box-shadow: var(--shadow-glow-lg);
        }
        .cta-box h2 {
            font-size: clamp(1.8rem, 3.5vw, 2.6rem);
            margin-bottom: 16px;
        }
        .cta-box p {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 520px;
            margin: 0 auto 32px;
        }
        .cta-box .btn i {
            transition: transform var(--transition);
        }
        .cta-box .btn:hover i {
            transform: translateX(4px);
        }
        @media (max-width: 768px) {
            .cta-section {
                padding: 64px 0;
            }
            .cta-box {
                padding: 40px 24px;
            }
        }
        @media (max-width: 480px) {
            .cta-box {
                padding: 32px 16px;
            }
            .cta-box .btn {
                width: 100%;
                max-width: 300px;
                justify-content: center;
            }
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-dark);
            border-top: 1px solid var(--border-color);
            padding: 48px 0 24px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 32px;
            padding-bottom: 32px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.04);
            margin-bottom: 24px;
        }
        .footer-brand .logo {
            margin-bottom: 14px;
            font-size: 1.15rem;
        }
        .footer-brand p {
            font-size: 0.9rem;
            color: var(--text-muted);
            max-width: 320px;
            line-height: 1.7;
        }
        .footer-col h4 {
            font-size: 0.95rem;
            font-weight: 600;
            margin-bottom: 16px;
            color: var(--text-primary);
        }
        .footer-col ul li {
            margin-bottom: 8px;
        }
        .footer-col ul li a {
            font-size: 0.88rem;
            color: var(--text-muted);
            transition: all var(--transition);
        }
        .footer-col ul li a:hover {
            color: var(--primary);
            padding-left: 4px;
        }
        .footer-social {
            display: flex;
            gap: 12px;
            margin-top: 16px;
        }
        .footer-social a {
            width: 38px;
            height: 38px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            background: rgba(255, 255, 255, 0.04);
            color: var(--text-secondary);
            border: 1px solid rgba(255, 255, 255, 0.06);
            transition: all var(--transition);
            font-size: 0.95rem;
        }
        .footer-social a:hover {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
            transform: translateY(-2px);
            box-shadow: 0 0 24px rgba(0, 200, 255, 0.20);
        }
        .footer-bottom {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 16px;
            font-size: 0.82rem;
            color: var(--text-muted);
        }
        .footer-bottom a {
            color: var(--text-muted);
        }
        .footer-bottom a:hover {
            color: var(--primary);
        }
        @media (max-width: 820px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
            .footer-brand p {
                max-width: 100%;
            }
        }
        @media (max-width: 480px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .site-footer {
                padding: 32px 0 20px;
            }
        }

        /* ===== Scrollbar ===== */
        ::-webkit-scrollbar {
            width: 6px;
        }
        ::-webkit-scrollbar-track {
            background: var(--bg-deep);
        }
        ::-webkit-scrollbar-thumb {
            background: rgba(0, 200, 255, 0.20);
            border-radius: 10px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: rgba(0, 200, 255, 0.35);
        }

        /* ===== Back to top ===== */
        .back-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            box-shadow: 0 0 30px rgba(0, 200, 255, 0.20);
            border: 1px solid rgba(0, 200, 255, 0.25);
            opacity: 0;
            visibility: hidden;
            transform: translateY(20px);
            transition: all var(--transition);
            z-index: 999;
            cursor: pointer;
        }
        .back-top.visible {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }
        .back-top:hover {
            transform: translateY(-4px);
            box-shadow: 0 0 44px rgba(0, 200, 255, 0.35);
        }
        @media (max-width: 480px) {
            .back-top {
                bottom: 16px;
                right: 16px;
                width: 38px;
                height: 38px;
                font-size: 0.95rem;
            }
        }

/* roulang page: category1 */
/* ============================================
           设计变量
           ============================================ */
        :root {
            --primary: #00f5ff;
            --primary-dark: #00c4d4;
            --primary-glow: rgba(0, 245, 255, 0.35);
            --secondary: #ff2d95;
            --secondary-glow: rgba(255, 45, 149, 0.3);
            --accent: #ffd700;
            --bg-dark: #0b0e1a;
            --bg-card: #11162b;
            --bg-card-hover: #181f3a;
            --bg-section-alt: #0d1225;
            --bg-input: #1a2140;
            --text-primary: #eef2ff;
            --text-secondary: #a8b5e0;
            --text-muted: #6b7aa8;
            --border-color: #1e2850;
            --border-glow: rgba(0, 245, 255, 0.15);
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
            --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.5);
            --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.6);
            --shadow-glow: 0 0 30px rgba(0, 245, 255, 0.08);
            --font-sans: 'Segoe UI', system-ui, -apple-system, sans-serif;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }

        /* ============================================
           基础 Reset / Base
           ============================================ */
        *,
        *::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);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-dark);
            min-height: 100vh;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--accent);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-md);
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: 1rem;
            border: none;
            outline: none;
            background: none;
            color: inherit;
        }
        button {
            cursor: pointer;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-weight: 700;
            line-height: 1.25;
            color: var(--text-primary);
        }
        h1 {
            font-size: 2.8rem;
        }
        h2 {
            font-size: 2rem;
        }
        h3 {
            font-size: 1.35rem;
        }
        h4 {
            font-size: 1.1rem;
        }
        p {
            color: var(--text-secondary);
            margin-bottom: 0.75rem;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }
        .section-padding {
            padding: 80px 0;
        }

        /* ============================================
           暗色霓虹 Header / 导航
           ============================================ */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(11, 14, 26, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-color);
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.5);
        }
        .header-inner {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 68px;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--text-primary);
            font-size: 1.25rem;
            font-weight: 700;
            letter-spacing: 0.5px;
            transition: color var(--transition);
        }
        .logo:hover {
            color: var(--primary);
        }
        .logo-icon {
            width: 38px;
            height: 38px;
            border-radius: 10px;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            color: #fff;
            box-shadow: 0 0 20px var(--primary-glow);
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .main-nav a {
            position: relative;
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            color: var(--text-secondary);
            font-size: 0.92rem;
            font-weight: 500;
            transition: all var(--transition);
        }
        .main-nav a:hover {
            color: var(--text-primary);
            background: rgba(0, 245, 255, 0.06);
        }
        .main-nav a.active {
            color: var(--primary);
            background: rgba(0, 245, 255, 0.1);
            box-shadow: inset 0 -2px 0 var(--primary), 0 0 20px var(--primary-glow);
        }
        .main-nav a.active::after {
            content: '';
            position: absolute;
            bottom: -1px;
            left: 50%;
            transform: translateX(-50%);
            width: 60%;
            height: 2px;
            background: var(--primary);
            border-radius: 2px;
            box-shadow: 0 0 12px var(--primary-glow);
        }
        .main-nav .nav-cta {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #0b0e1a !important;
            font-weight: 600;
            padding: 8px 22px;
            border-radius: var(--radius-sm);
            box-shadow: 0 0 20px var(--primary-glow);
            transition: all var(--transition);
        }
        .main-nav .nav-cta:hover {
            transform: translateY(-2px) scale(1.02);
            box-shadow: 0 0 30px var(--primary-glow), 0 6px 20px rgba(0, 245, 255, 0.25);
            color: #0b0e1a !important;
        }
        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 6px;
            border-radius: var(--radius-sm);
            background: transparent;
            transition: background var(--transition);
        }
        .nav-toggle span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: var(--text-primary);
            border-radius: 4px;
            transition: all 0.3s ease;
        }
        .nav-toggle:hover {
            background: rgba(0, 245, 255, 0.08);
        }

        /* ============================================
           移动端导航
           ============================================ */
        @media (max-width: 768px) {
            .main-nav {
                position: fixed;
                top: 68px;
                left: 0;
                right: 0;
                background: rgba(11, 14, 26, 0.98);
                backdrop-filter: blur(20px);
                -webkit-backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 20px 24px 30px;
                gap: 6px;
                border-bottom: 1px solid var(--border-color);
                box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
                transform: translateY(-120%);
                opacity: 0;
                pointer-events: none;
                transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
                border-radius: 0 0 var(--radius-lg) var(--radius-lg);
            }
            .main-nav.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .main-nav a {
                width: 100%;
                padding: 12px 18px;
                font-size: 1rem;
                text-align: center;
                border-radius: var(--radius-sm);
            }
            .main-nav a.active {
                background: rgba(0, 245, 255, 0.12);
            }
            .main-nav a.active::after {
                display: none;
            }
            .main-nav .nav-cta {
                margin-top: 8px;
                text-align: center;
            }
            .nav-toggle {
                display: flex;
            }
            .nav-toggle.active span:nth-child(1) {
                transform: rotate(45deg) translate(5px, 5px);
            }
            .nav-toggle.active span:nth-child(2) {
                opacity: 0;
                transform: scaleX(0);
            }
            .nav-toggle.active span:nth-child(3) {
                transform: rotate(-45deg) translate(5px, -5px);
            }
        }
        @media (max-width: 520px) {
            .header-inner {
                padding: 0 16px;
            }
            .logo {
                font-size: 1.05rem;
            }
            .logo-icon {
                width: 32px;
                height: 32px;
                font-size: 1rem;
            }
            .main-nav {
                padding: 16px 16px 24px;
            }
        }

        /* ============================================
           分类 Banner / Hero
           ============================================ */
        .category-hero {
            position: relative;
            padding: 100px 0 80px;
            background: linear-gradient(160deg, #0b0e1a 0%, #0d1830 50%, #0b0e1a 100%);
            overflow: hidden;
            border-bottom: 1px solid var(--border-color);
        }
        .category-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.12;
            mix-blend-mode: screen;
            pointer-events: none;
        }
        .category-hero::after {
            content: '';
            position: absolute;
            top: -30%;
            right: -10%;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(0, 245, 255, 0.06), transparent 70%);
            pointer-events: none;
        }
        .category-hero .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .category-hero .cat-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(0, 245, 255, 0.12);
            border: 1px solid rgba(0, 245, 255, 0.2);
            padding: 6px 20px;
            border-radius: 30px;
            font-size: 0.85rem;
            color: var(--primary);
            font-weight: 500;
            margin-bottom: 20px;
            letter-spacing: 0.3px;
        }
        .category-hero .cat-badge i {
            font-size: 0.9rem;
        }
        .category-hero h1 {
            font-size: 3rem;
            background: linear-gradient(135deg, #ffffff, var(--primary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }
        .category-hero p {
            font-size: 1.15rem;
            color: var(--text-secondary);
            max-width: 680px;
            margin: 0 auto 28px;
            line-height: 1.8;
        }
        .category-hero .hero-stats {
            display: flex;
            justify-content: center;
            gap: 40px;
            flex-wrap: wrap;
            margin-top: 12px;
        }
        .category-hero .hero-stats .stat-item {
            text-align: center;
        }
        .category-hero .hero-stats .stat-num {
            font-size: 2rem;
            font-weight: 800;
            color: var(--primary);
            text-shadow: 0 0 30px var(--primary-glow);
            display: block;
            line-height: 1.2;
        }
        .category-hero .hero-stats .stat-label {
            font-size: 0.85rem;
            color: var(--text-muted);
            font-weight: 400;
        }

        @media (max-width: 768px) {
            .category-hero {
                padding: 70px 0 50px;
            }
            .category-hero h1 {
                font-size: 2rem;
            }
            .category-hero p {
                font-size: 1rem;
            }
            .category-hero .hero-stats {
                gap: 24px;
            }
            .category-hero .hero-stats .stat-num {
                font-size: 1.5rem;
            }
        }
        @media (max-width: 520px) {
            .category-hero h1 {
                font-size: 1.6rem;
            }
            .category-hero .hero-stats {
                gap: 16px;
            }
            .category-hero .hero-stats .stat-num {
                font-size: 1.25rem;
            }
        }

        /* ============================================
           分类筛选 / 标签
           ============================================ */
        .filter-bar {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 16px 24px;
            display: flex;
            align-items: center;
            gap: 12px;
            flex-wrap: wrap;
            margin-top: -32px;
            position: relative;
            z-index: 5;
            box-shadow: var(--shadow-md);
        }
        .filter-bar .filter-label {
            font-size: 0.9rem;
            color: var(--text-muted);
            font-weight: 500;
            margin-right: 8px;
            white-space: nowrap;
        }
        .filter-bar .tag {
            display: inline-block;
            padding: 6px 18px;
            border-radius: 30px;
            font-size: 0.85rem;
            font-weight: 500;
            color: var(--text-secondary);
            background: var(--bg-input);
            border: 1px solid transparent;
            transition: all var(--transition);
            cursor: pointer;
        }
        .filter-bar .tag:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: rgba(0, 245, 255, 0.06);
        }
        .filter-bar .tag.active {
            background: rgba(0, 245, 255, 0.12);
            border-color: var(--primary);
            color: var(--primary);
            box-shadow: 0 0 16px var(--primary-glow);
        }
        .filter-bar .tag i {
            margin-right: 5px;
            font-size: 0.8rem;
        }

        @media (max-width: 600px) {
            .filter-bar {
                padding: 14px 16px;
                gap: 8px;
                margin-top: -24px;
            }
            .filter-bar .filter-label {
                width: 100%;
                margin-bottom: 4px;
            }
            .filter-bar .tag {
                font-size: 0.8rem;
                padding: 4px 14px;
            }
        }

        /* ============================================
           文章列表 / 卡片网格
           ============================================ */
        .articles-section {
            background: var(--bg-dark);
        }
        .articles-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
            margin-top: 40px;
        }
        .article-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
        }
        .article-card:hover {
            transform: translateY(-6px);
            border-color: rgba(0, 245, 255, 0.2);
            box-shadow: var(--shadow-lg), var(--shadow-glow);
            background: var(--bg-card-hover);
        }
        .article-card .card-img {
            position: relative;
            aspect-ratio: 16 / 10;
            overflow: hidden;
            background: var(--bg-input);
        }
        .article-card .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .article-card:hover .card-img img {
            transform: scale(1.05);
        }
        .article-card .card-img .card-tag {
            position: absolute;
            top: 12px;
            left: 12px;
            background: rgba(0, 245, 255, 0.9);
            color: #0b0e1a;
            font-size: 0.75rem;
            font-weight: 700;
            padding: 4px 14px;
            border-radius: 30px;
            letter-spacing: 0.3px;
            backdrop-filter: blur(4px);
        }
        .article-card .card-img .card-tag.hot {
            background: rgba(255, 45, 149, 0.9);
            color: #fff;
        }
        .article-card .card-body {
            padding: 22px 24px 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .article-card .card-body .meta {
            display: flex;
            align-items: center;
            gap: 16px;
            font-size: 0.82rem;
            color: var(--text-muted);
            margin-bottom: 10px;
        }
        .article-card .card-body .meta i {
            margin-right: 4px;
            font-size: 0.75rem;
        }
        .article-card .card-body h3 {
            font-size: 1.15rem;
            margin-bottom: 10px;
            transition: color var(--transition);
        }
        .article-card:hover .card-body h3 {
            color: var(--primary);
        }
        .article-card .card-body p {
            font-size: 0.92rem;
            color: var(--text-secondary);
            flex: 1;
            margin-bottom: 16px;
            display: -webkit-box;
            -webkit-line-clamp: 3;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .article-card .card-body .read-more {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 0.88rem;
            font-weight: 600;
            color: var(--primary);
            transition: all var(--transition);
            align-self: flex-start;
        }
        .article-card .card-body .read-more i {
            font-size: 0.8rem;
            transition: transform var(--transition);
        }
        .article-card .card-body .read-more:hover {
            color: var(--accent);
        }
        .article-card .card-body .read-more:hover i {
            transform: translateX(4px);
        }

        @media (max-width: 1024px) {
            .articles-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 24px;
            }
        }
        @media (max-width: 600px) {
            .articles-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .article-card .card-body {
                padding: 18px 18px 20px;
            }
        }

        /* ============================================
           分类列表 (横向)
           ============================================ */
        .subcategories-section {
            background: var(--bg-section-alt);
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
        }
        .subcat-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            margin-top: 36px;
        }
        .subcat-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 28px 22px;
            text-align: center;
            transition: all var(--transition);
        }
        .subcat-card:hover {
            border-color: rgba(0, 245, 255, 0.2);
            transform: translateY(-4px);
            box-shadow: var(--shadow-md), var(--shadow-glow);
            background: var(--bg-card-hover);
        }
        .subcat-card .icon-wrap {
            width: 56px;
            height: 56px;
            margin: 0 auto 16px;
            border-radius: var(--radius-md);
            background: linear-gradient(135deg, rgba(0, 245, 255, 0.12), rgba(255, 45, 149, 0.08));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.6rem;
            color: var(--primary);
            transition: all var(--transition);
        }
        .subcat-card:hover .icon-wrap {
            background: linear-gradient(135deg, rgba(0, 245, 255, 0.2), rgba(255, 45, 149, 0.15));
            box-shadow: 0 0 30px var(--primary-glow);
        }
        .subcat-card h4 {
            font-size: 1.05rem;
            margin-bottom: 6px;
        }
        .subcat-card p {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-bottom: 0;
        }
        .subcat-card .count {
            display: inline-block;
            margin-top: 12px;
            font-size: 0.78rem;
            color: var(--text-muted);
            background: var(--bg-input);
            padding: 2px 14px;
            border-radius: 30px;
        }

        @media (max-width: 900px) {
            .subcat-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
        }
        @media (max-width: 520px) {
            .subcat-grid {
                grid-template-columns: 1fr;
                gap: 14px;
            }
            .subcat-card {
                padding: 20px 16px;
            }
        }

        /* ============================================
           特色内容 / 精选攻略
           ============================================ */
        .featured-section {
            background: var(--bg-dark);
        }
        .featured-wrap {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
            margin-top: 40px;
            align-items: center;
        }
        .featured-wrap .featured-img {
            border-radius: var(--radius-lg);
            overflow: hidden;
            background: var(--bg-input);
            aspect-ratio: 4 / 3;
            box-shadow: var(--shadow-lg);
            border: 1px solid var(--border-color);
        }
        .featured-wrap .featured-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .featured-wrap .featured-content h2 {
            margin-bottom: 16px;
        }
        .featured-wrap .featured-content .highlight-list {
            margin: 20px 0;
        }
        .featured-wrap .featured-content .highlight-list li {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            padding: 8px 0;
            color: var(--text-secondary);
            font-size: 0.95rem;
            border-bottom: 1px solid rgba(30, 40, 80, 0.4);
        }
        .featured-wrap .featured-content .highlight-list li:last-child {
            border-bottom: none;
        }
        .featured-wrap .featured-content .highlight-list li i {
            color: var(--primary);
            font-size: 0.9rem;
            margin-top: 4px;
            flex-shrink: 0;
        }
        .featured-wrap .featured-content .btn-group {
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
            margin-top: 20px;
        }

        @media (max-width: 860px) {
            .featured-wrap {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .featured-wrap .featured-img {
                order: -1;
                aspect-ratio: 16 / 9;
            }
        }
        @media (max-width: 520px) {
            .featured-wrap .featured-content .btn-group {
                flex-direction: column;
                gap: 10px;
            }
        }

        /* ============================================
           排行榜 / 热门排行
           ============================================ */
        .ranking-section {
            background: var(--bg-section-alt);
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
        }
        .ranking-list {
            margin-top: 36px;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .ranking-item {
            display: flex;
            align-items: center;
            gap: 18px;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 16px 22px;
            transition: all var(--transition);
        }
        .ranking-item:hover {
            border-color: rgba(0, 245, 255, 0.15);
            background: var(--bg-card-hover);
            transform: translateX(4px);
        }
        .ranking-item .rank-num {
            font-size: 1.6rem;
            font-weight: 800;
            color: var(--text-muted);
            width: 44px;
            text-align: center;
            flex-shrink: 0;
        }
        .ranking-item:nth-child(1) .rank-num {
            color: var(--accent);
            text-shadow: 0 0 20px rgba(255, 215, 0, 0.3);
        }
        .ranking-item:nth-child(2) .rank-num {
            color: var(--text-secondary);
        }
        .ranking-item:nth-child(3) .rank-num {
            color: var(--text-secondary);
        }
        .ranking-item .rank-info {
            flex: 1;
        }
        .ranking-item .rank-info h4 {
            font-size: 1rem;
            margin-bottom: 2px;
        }
        .ranking-item .rank-info p {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-bottom: 0;
        }
        .ranking-item .rank-score {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--primary);
            flex-shrink: 0;
        }
        .ranking-item .rank-score i {
            margin-right: 4px;
            font-size: 0.85rem;
        }
        .ranking-item .rank-badge {
            font-size: 0.75rem;
            padding: 2px 12px;
            border-radius: 30px;
            font-weight: 600;
            flex-shrink: 0;
        }
        .ranking-item .rank-badge.hot {
            background: rgba(255, 45, 149, 0.2);
            color: var(--secondary);
        }
        .ranking-item .rank-badge.trend {
            background: rgba(0, 245, 255, 0.12);
            color: var(--primary);
        }

        @media (max-width: 600px) {
            .ranking-item {
                flex-wrap: wrap;
                gap: 10px;
                padding: 14px 16px;
            }
            .ranking-item .rank-num {
                width: 30px;
                font-size: 1.2rem;
            }
            .ranking-item .rank-score {
                width: 100%;
                text-align: left;
                font-size: 0.95rem;
            }
            .ranking-item .rank-badge {
                margin-left: auto;
            }
        }

        /* ============================================
           FAQ
           ============================================ */
        .faq-section {
            background: var(--bg-dark);
        }
        .faq-list {
            max-width: 820px;
            margin: 36px auto 0;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover {
            border-color: rgba(0, 245, 255, 0.1);
        }
        .faq-item .faq-q {
            padding: 18px 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            cursor: pointer;
            font-weight: 600;
            font-size: 1rem;
            color: var(--text-primary);
            transition: color var(--transition);
            user-select: none;
        }
        .faq-item .faq-q:hover {
            color: var(--primary);
        }
        .faq-item .faq-q i {
            font-size: 1rem;
            color: var(--primary);
            transition: transform var(--transition);
            flex-shrink: 0;
        }
        .faq-item.active .faq-q i {
            transform: rotate(45deg);
        }
        .faq-item .faq-a {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 24px;
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.8;
        }
        .faq-item.active .faq-a {
            max-height: 260px;
            padding: 0 24px 20px;
        }

        @media (max-width: 600px) {
            .faq-item .faq-q {
                padding: 14px 16px;
                font-size: 0.95rem;
            }
            .faq-item .faq-a {
                padding: 0 16px;
                font-size: 0.9rem;
            }
            .faq-item.active .faq-a {
                padding: 0 16px 16px;
            }
        }

        /* ============================================
           CTA
           ============================================ */
        .cta-section {
            background: linear-gradient(160deg, #0d1225, #0b0e1a);
            border-top: 1px solid var(--border-color);
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-3.png') center center / cover no-repeat;
            opacity: 0.06;
            mix-blend-mode: screen;
            pointer-events: none;
        }
        .cta-box {
            position: relative;
            z-index: 2;
            text-align: center;
            padding: 40px 20px;
        }
        .cta-box h2 {
            font-size: 2.2rem;
            margin-bottom: 16px;
        }
        .cta-box p {
            max-width: 560px;
            margin: 0 auto 28px;
            font-size: 1.05rem;
        }
        .cta-box .cta-buttons {
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }

        /* ============================================
           按钮系统
           ============================================ */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 12px 30px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.95rem;
            transition: all var(--transition);
            border: 1px solid transparent;
            text-align: center;
            justify-content: center;
        }
        .btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #0b0e1a !important;
            box-shadow: 0 0 20px var(--primary-glow);
        }
        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 0 35px var(--primary-glow), 0 8px 24px rgba(0, 245, 255, 0.2);
            color: #0b0e1a !important;
        }
        .btn-secondary {
            background: transparent;
            border: 1px solid var(--border-color);
            color: var(--text-primary) !important;
        }
        .btn-secondary:hover {
            border-color: var(--primary);
            color: var(--primary) !important;
            background: rgba(0, 245, 255, 0.06);
            transform: translateY(-3px);
        }
        .btn-sm {
            padding: 8px 20px;
            font-size: 0.85rem;
        }
        .btn-lg {
            padding: 16px 40px;
            font-size: 1.05rem;
        }

        /* ============================================
           分页
           ============================================ */
        .pagination-wrap {
            display: flex;
            justify-content: center;
            gap: 8px;
            margin-top: 48px;
            flex-wrap: wrap;
        }
        .pagination-wrap a,
        .pagination-wrap span {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            min-width: 42px;
            height: 42px;
            padding: 0 14px;
            border-radius: var(--radius-sm);
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-secondary);
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            transition: all var(--transition);
        }
        .pagination-wrap a:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: rgba(0, 245, 255, 0.06);
        }
        .pagination-wrap .current {
            background: rgba(0, 245, 255, 0.12);
            border-color: var(--primary);
            color: var(--primary);
            box-shadow: 0 0 16px var(--primary-glow);
        }
        .pagination-wrap .dots {
            border: none;
            background: transparent;
            color: var(--text-muted);
        }

        /* ============================================
           页脚 (复用首页)
           ============================================ */
        .site-footer {
            background: #080b17;
            border-top: 1px solid var(--border-color);
            padding: 60px 0 30px;
        }
        .site-footer .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid var(--border-color);
        }
        .footer-brand .logo {
            font-size: 1.15rem;
            margin-bottom: 14px;
            display: inline-flex;
        }
        .footer-brand p {
            font-size: 0.9rem;
            color: var(--text-muted);
            margin-bottom: 18px;
            max-width: 360px;
            line-height: 1.8;
        }
        .footer-social {
            display: flex;
            gap: 12px;
        }
        .footer-social a {
            width: 38px;
            height: 38px;
            border-radius: 50%;
            background: var(--bg-input);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-muted);
            font-size: 1rem;
            transition: all var(--transition);
            border: 1px solid transparent;
        }
        .footer-social a:hover {
            background: rgba(0, 245, 255, 0.1);
            border-color: var(--primary);
            color: var(--primary);
            transform: translateY(-2px);
            box-shadow: 0 0 16px var(--primary-glow);
        }
        .footer-col h4 {
            font-size: 0.95rem;
            color: var(--text-primary);
            margin-bottom: 18px;
            letter-spacing: 0.5px;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul li a {
            font-size: 0.88rem;
            color: var(--text-muted);
            transition: all var(--transition);
        }
        .footer-col ul li a:hover {
            color: var(--primary);
            padding-left: 4px;
        }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            padding-top: 24px;
            font-size: 0.82rem;
            color: var(--text-muted);
        }
        .footer-bottom a {
            color: var(--text-muted);
        }
        .footer-bottom a:hover {
            color: var(--primary);
        }

        @media (max-width: 860px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 30px;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
        }
        @media (max-width: 520px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .site-footer {
                padding: 40px 0 20px;
            }
        }

        /* ============================================
           辅助 / 通用
           ============================================ */
        .section-title {
            text-align: center;
            margin-bottom: 8px;
        }
        .section-title h2 {
            font-size: 2rem;
            margin-bottom: 10px;
        }
        .section-title p {
            max-width: 600px;
            margin: 0 auto;
            color: var(--text-secondary);
            font-size: 1.02rem;
        }
        .section-title .subtitle-badge {
            display: inline-block;
            font-size: 0.8rem;
            color: var(--primary);
            background: rgba(0, 245, 255, 0.08);
            padding: 4px 18px;
            border-radius: 30px;
            border: 1px solid rgba(0, 245, 255, 0.12);
            margin-bottom: 12px;
            font-weight: 500;
            letter-spacing: 0.3px;
        }
        .divider {
            width: 60px;
            height: 3px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            border-radius: 4px;
            margin: 16px auto 24px;
            box-shadow: 0 0 20px var(--primary-glow);
        }
        .text-center {
            text-align: center;
        }

        @media (max-width: 768px) {
            .section-title h2 {
                font-size: 1.5rem;
            }
            .section-padding {
                padding: 50px 0;
            }
            .container {
                padding: 0 16px;
            }
        }
        @media (max-width: 520px) {
            .section-title h2 {
                font-size: 1.3rem;
            }
        }

        /* ============================================
           focus / active 可访问性
           ============================================ */
        a:focus-visible,
        button:focus-visible,
        input:focus-visible,
        textarea:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 3px;
            border-radius: var(--radius-sm);
        }

        /* ============================================
           滚动条美化
           ============================================ */
        ::-webkit-scrollbar {
            width: 6px;
            height: 6px;
        }
        ::-webkit-scrollbar-track {
            background: var(--bg-dark);
        }
        ::-webkit-scrollbar-thumb {
            background: var(--border-color);
            border-radius: 10px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: var(--text-muted);
        }

/* roulang page: article */
/* ===== 设计变量 ===== */
        :root {
            --primary: #3b82f6;
            --primary-dark: #1d4ed8;
            --primary-light: #60a5fa;
            --accent: #8b5cf6;
            --accent-light: #a78bfa;
            --nav-bg: #0a0a1a;
            --nav-border: #1e2a4a;
            --nav-text: #c8d0e0;
            --nav-active: #3b82f6;
            --nav-cta-bg: #3b82f6;
            --nav-cta-hover: #2563eb;
            --bg: #f4f6fb;
            --bg-card: #ffffff;
            --bg-section: #ffffff;
            --bg-alt: #eef1f8;
            --text: #1a1a2e;
            --text-light: #5a6278;
            --text-muted: #8e95a8;
            --border: #e2e6ef;
            --radius: 16px;
            --radius-sm: 8px;
            --radius-lg: 24px;
            --shadow: 0 8px 30px rgba(0,0,0,0.06);
            --shadow-hover: 0 16px 48px rgba(0,0,0,0.12);
            --transition: 0.3s cubic-bezier(0.4,0,0.2,1);
            --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
            --max-width: 1200px;
            --header-h: 72px;
        }

        /* ===== Reset / Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
        body {
            font-family: var(--font);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
        }
        a { color: var(--primary); text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--primary-dark); }
        img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-sm); }
        button, input, textarea { font-family: inherit; font-size: 1rem; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--text); }
        .container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }

        /* ===== Header / Nav (暗色霓虹) ===== */
        .site-header {
            position: fixed; top: 0; left: 0; width: 100%; height: var(--header-h);
            background: var(--nav-bg); border-bottom: 1px solid var(--nav-border);
            z-index: 1000; box-shadow: 0 2px 20px rgba(0,0,0,0.4);
        }
        .header-inner {
            max-width: var(--max-width); margin: 0 auto; padding: 0 24px;
            height: 100%; display: flex; align-items: center; justify-content: space-between;
        }
        .logo {
            display: flex; align-items: center; gap: 10px; font-size: 1.4rem;
            font-weight: 800; color: #fff; letter-spacing: 0.5px;
        }
        .logo:hover { color: var(--primary-light); }
        .logo-icon {
            width: 40px; height: 40px; display: flex; align-items: center; justify-content: center;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            border-radius: var(--radius-sm); color: #fff; font-size: 1.2rem;
            box-shadow: 0 0 20px rgba(59,130,246,0.3);
        }
        .main-nav { display: flex; align-items: center; gap: 8px; }
        .main-nav a {
            padding: 8px 18px; border-radius: var(--radius-sm); font-size: 0.9rem;
            font-weight: 500; color: var(--nav-text); transition: var(--transition);
            position: relative; white-space: nowrap;
        }
        .main-nav a::after {
            content: ''; position: absolute; bottom: 0; left: 50%; transform: translateX(-50%);
            width: 0; height: 3px; background: var(--nav-active);
            border-radius: 2px; transition: var(--transition);
            box-shadow: 0 0 12px rgba(59,130,246,0.6);
        }
        .main-nav a:hover { color: #fff; background: rgba(255,255,255,0.05); }
        .main-nav a:hover::after { width: 60%; }
        .main-nav a.active { color: #fff; }
        .main-nav a.active::after { width: 70%; }
        .main-nav a.nav-cta {
            background: var(--nav-cta-bg); color: #fff; padding: 8px 22px;
            border-radius: 50px; font-weight: 700; box-shadow: 0 4px 16px rgba(59,130,246,0.35);
        }
        .main-nav a.nav-cta::after { display: none; }
        .main-nav a.nav-cta:hover { background: var(--nav-cta-hover); transform: translateY(-1px); box-shadow: 0 6px 24px rgba(59,130,246,0.5); }
        .nav-toggle {
            display: none; flex-direction: column; gap: 5px; background: none; border: none;
            cursor: pointer; padding: 8px;
        }
        .nav-toggle span { display: block; width: 26px; height: 2.5px; background: #fff; border-radius: 4px; transition: var(--transition); }
        @media (max-width: 768px) {
            .nav-toggle { display: flex; }
            .main-nav {
                position: fixed; top: var(--header-h); left: 0; width: 100%;
                background: rgba(10,10,26,0.98); backdrop-filter: blur(12px);
                flex-direction: column; padding: 20px 24px; gap: 12px;
                transform: translateY(-120%); opacity: 0; transition: var(--transition);
                border-bottom: 2px solid var(--nav-border); pointer-events: none;
            }
            .main-nav.open { transform: translateY(0); opacity: 1; pointer-events: auto; }
            .main-nav a { width: 100%; text-align: center; padding: 12px; font-size: 1rem; }
            .main-nav a.nav-cta { margin-top: 8px; }
        }

        /* ===== Article Banner ===== */
        .article-banner {
            padding: 140px 0 60px; margin-top: var(--header-h);
            background: linear-gradient(135deg, rgba(10,10,26,0.85), rgba(30,42,74,0.7)), url('/assets/images/backpic/back-1.png') center/cover no-repeat;
            position: relative; text-align: center; color: #fff;
        }
        .article-banner .breadcrumb {
            display: flex; justify-content: center; align-items: center; gap: 8px;
            font-size: 0.85rem; color: rgba(255,255,255,0.7); margin-bottom: 20px; flex-wrap: wrap;
        }
        .article-banner .breadcrumb a { color: rgba(255,255,255,0.8); }
        .article-banner .breadcrumb a:hover { color: var(--primary-light); }
        .article-banner .breadcrumb .sep { color: rgba(255,255,255,0.4); }
        .article-banner .breadcrumb .current { color: #fff; font-weight: 500; }
        .article-banner h1 {
            font-size: clamp(1.8rem, 4vw, 3rem); font-weight: 800; color: #fff;
            max-width: 900px; margin: 0 auto 16px; line-height: 1.3;
            text-shadow: 0 4px 30px rgba(0,0,0,0.3);
        }
        .article-meta {
            display: flex; justify-content: center; align-items: center; gap: 20px;
            flex-wrap: wrap; font-size: 0.9rem; color: rgba(255,255,255,0.75);
        }
        .article-meta span { display: flex; align-items: center; gap: 6px; }
        .article-meta i { color: var(--primary-light); }
        .article-meta .category-badge {
            background: var(--primary); color: #fff; padding: 3px 14px;
            border-radius: 50px; font-size: 0.8rem; font-weight: 600;
        }

        /* ===== Article Content ===== */
        .article-section { padding: 60px 0; background: var(--bg-section); }
        .article-layout {
            display: grid; grid-template-columns: 1fr 300px; gap: 40px;
            max-width: var(--max-width); margin: 0 auto; padding: 0 24px;
        }
        .article-body {
            background: var(--bg-card); border-radius: var(--radius); padding: 40px 48px;
            box-shadow: var(--shadow); border: 1px solid var(--border);
        }
        .article-body .article-content {
            font-size: 1.05rem; line-height: 1.9; color: var(--text);
        }
        .article-body .article-content p { margin-bottom: 1.5em; }
        .article-body .article-content h2, .article-body .article-content h3 {
            margin-top: 2em; margin-bottom: 0.8em; color: var(--text);
        }
        .article-body .article-content img { border-radius: var(--radius-sm); margin: 1.5em 0; box-shadow: var(--shadow); }
        .article-body .article-content ul, .article-body .article-content ol { margin: 1em 0; padding-left: 1.5em; list-style: disc; }
        .article-body .article-content li { margin-bottom: 0.5em; }
        .article-body .article-content blockquote {
            border-left: 4px solid var(--primary); padding: 12px 20px; margin: 1.5em 0;
            background: var(--bg-alt); border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-light); font-style: italic;
        }
        .article-body .article-content a { color: var(--primary); text-decoration: underline; }
        .article-body .article-content a:hover { color: var(--primary-dark); }

        /* 标签与分享 */
        .article-tags-share {
            display: flex; justify-content: space-between; align-items: center;
            flex-wrap: wrap; gap: 16px; margin-top: 40px; padding-top: 24px;
            border-top: 1px solid var(--border);
        }
        .article-tags { display: flex; flex-wrap: wrap; gap: 8px; }
        .article-tags .tag {
            background: var(--bg-alt); color: var(--text-light); padding: 4px 14px;
            border-radius: 50px; font-size: 0.8rem; font-weight: 500;
            border: 1px solid var(--border); transition: var(--transition);
        }
        .article-tags .tag:hover { background: var(--primary); color: #fff; border-color: var(--primary); }
        .share-buttons { display: flex; gap: 10px; }
        .share-buttons a {
            width: 38px; height: 38px; display: flex; align-items: center; justify-content: center;
            border-radius: 50%; background: var(--bg-alt); color: var(--text-light);
            font-size: 1rem; transition: var(--transition); border: 1px solid var(--border);
        }
        .share-buttons a:hover { background: var(--primary); color: #fff; border-color: var(--primary); transform: translateY(-2px); }

        /* 侧边栏 */
        .article-sidebar { display: flex; flex-direction: column; gap: 30px; }
        .sidebar-card {
            background: var(--bg-card); border-radius: var(--radius); padding: 28px;
            box-shadow: var(--shadow); border: 1px solid var(--border);
        }
        .sidebar-card h3 {
            font-size: 1.1rem; margin-bottom: 16px; padding-bottom: 12px;
            border-bottom: 2px solid var(--primary); display: inline-block;
        }
        .sidebar-card .side-list li {
            padding: 10px 0; border-bottom: 1px solid var(--border); font-size: 0.9rem;
        }
        .sidebar-card .side-list li:last-child { border-bottom: none; }
        .sidebar-card .side-list a { color: var(--text); display: flex; align-items: center; gap: 10px; }
        .sidebar-card .side-list a:hover { color: var(--primary); }
        .sidebar-card .side-list i { color: var(--primary); font-size: 0.8rem; }

        /* ===== Related Posts ===== */
        .related-section { padding: 60px 0; background: var(--bg-alt); }
        .related-section .section-title {
            text-align: center; font-size: 2rem; margin-bottom: 40px; font-weight: 800;
        }
        .related-section .section-title span { color: var(--primary); }
        .related-grid {
            display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
            gap: 24px; max-width: var(--max-width); margin: 0 auto; padding: 0 24px;
        }
        .related-card {
            background: var(--bg-card); border-radius: var(--radius); overflow: hidden;
            box-shadow: var(--shadow); border: 1px solid var(--border);
            transition: var(--transition); display: flex; flex-direction: column;
        }
        .related-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
        .related-card .card-img {
            height: 180px; overflow: hidden; position: relative;
        }
        .related-card .card-img img { width: 100%; height: 100%; object-fit: cover; transition: var(--transition); }
        .related-card:hover .card-img img { transform: scale(1.08); }
        .related-card .card-img .img-overlay {
            position: absolute; bottom: 0; left: 0; right: 0;
            background: linear-gradient(transparent, rgba(0,0,0,0.5)); padding: 16px;
        }
        .related-card .card-img .img-overlay .badge {
            background: var(--primary); color: #fff; padding: 2px 12px;
            border-radius: 50px; font-size: 0.7rem; font-weight: 600;
        }
        .related-card .card-body { padding: 20px; flex: 1; display: flex; flex-direction: column; }
        .related-card .card-body h4 { font-size: 1rem; font-weight: 700; margin-bottom: 8px; line-height: 1.4; }
        .related-card .card-body h4 a { color: var(--text); }
        .related-card .card-body h4 a:hover { color: var(--primary); }
        .related-card .card-body p { font-size: 0.85rem; color: var(--text-light); flex: 1; margin-bottom: 12px; }
        .related-card .card-body .meta { font-size: 0.78rem; color: var(--text-muted); display: flex; gap: 14px; }

        /* ===== CTA ===== */
        .cta-section {
            padding: 80px 0; background: linear-gradient(135deg, var(--nav-bg), #14142e);
            text-align: center; color: #fff; position: relative; overflow: hidden;
        }
        .cta-section::before {
            content: ''; position: absolute; top: -50%; left: -50%; width: 200%; height: 200%;
            background: radial-gradient(circle at 30% 50%, rgba(59,130,246,0.15), transparent 60%);
            pointer-events: none;
        }
        .cta-section .container { position: relative; z-index: 1; }
        .cta-section h2 { font-size: clamp(1.8rem, 3.5vw, 2.6rem); color: #fff; margin-bottom: 16px; }
        .cta-section p { font-size: 1.1rem; color: rgba(255,255,255,0.7); max-width: 600px; margin: 0 auto 32px; }
        .cta-section .btn-group { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; }
        .cta-section .btn-primary, .cta-section .btn-outline {
            padding: 14px 40px; border-radius: 50px; font-weight: 700; font-size: 1rem;
            transition: var(--transition); display: inline-flex; align-items: center; gap: 10px; cursor: pointer;
        }
        .cta-section .btn-primary {
            background: var(--primary); color: #fff; border: 2px solid var(--primary);
            box-shadow: 0 8px 30px rgba(59,130,246,0.4);
        }
        .cta-section .btn-primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 12px 40px rgba(59,130,246,0.5); }
        .cta-section .btn-outline {
            background: transparent; color: #fff; border: 2px solid rgba(255,255,255,0.3);
        }
        .cta-section .btn-outline:hover { border-color: #fff; background: rgba(255,255,255,0.08); transform: translateY(-2px); }

        /* ===== FAQ ===== */
        .faq-section { padding: 60px 0; background: var(--bg-section); }
        .faq-section .section-title { text-align: center; font-size: 2rem; margin-bottom: 40px; font-weight: 800; }
        .faq-section .section-title span { color: var(--primary); }
        .faq-list { max-width: 800px; margin: 0 auto; padding: 0 24px; display: flex; flex-direction: column; gap: 12px; }
        .faq-item {
            background: var(--bg-card); border-radius: var(--radius); border: 1px solid var(--border);
            overflow: hidden; transition: var(--transition); box-shadow: var(--shadow);
        }
        .faq-item:hover { box-shadow: var(--shadow-hover); }
        .faq-question {
            padding: 18px 24px; display: flex; justify-content: space-between; align-items: center;
            cursor: pointer; font-weight: 600; font-size: 1rem; color: var(--text);
            background: var(--bg-card); transition: var(--transition); border: none; width: 100%; text-align: left;
        }
        .faq-question:hover { background: var(--bg-alt); }
        .faq-question i { color: var(--primary); transition: var(--transition); font-size: 0.9rem; }
        .faq-item.open .faq-question i { transform: rotate(180deg); }
        .faq-answer {
            padding: 0 24px; max-height: 0; overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
        }
        .faq-item.open .faq-answer {
            max-height: 300px; padding: 0 24px 20px;
        }
        .faq-answer p { color: var(--text-light); font-size: 0.95rem; line-height: 1.7; }

        /* ===== Not Found ===== */
        .not-found-wrap { padding: 100px 0; text-align: center; }
        .not-found-wrap .icon { font-size: 4rem; color: var(--text-muted); margin-bottom: 20px; }
        .not-found-wrap h2 { font-size: 2rem; margin-bottom: 12px; }
        .not-found-wrap p { color: var(--text-light); margin-bottom: 24px; }
        .not-found-wrap a { color: var(--primary); font-weight: 600; }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--nav-bg); color: rgba(255,255,255,0.7); padding: 60px 0 30px;
            border-top: 1px solid var(--nav-border);
        }
        .site-footer .container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
        .footer-grid {
            display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px;
        }
        .footer-brand .logo { margin-bottom: 16px; }
        .footer-brand p { font-size: 0.9rem; line-height: 1.7; color: rgba(255,255,255,0.6); margin-bottom: 20px; }
        .footer-social { display: flex; gap: 14px; }
        .footer-social a {
            width: 40px; height: 40px; display: flex; align-items: center; justify-content: center;
            border-radius: 50%; background: rgba(255,255,255,0.08); color: rgba(255,255,255,0.7);
            transition: var(--transition); font-size: 1.1rem;
        }
        .footer-social a:hover { background: var(--primary); color: #fff; transform: translateY(-2px); }
        .footer-col h4 { color: #fff; font-size: 1rem; margin-bottom: 18px; font-weight: 700; }
        .footer-col ul li { margin-bottom: 10px; }
        .footer-col ul a { color: rgba(255,255,255,0.6); font-size: 0.9rem; transition: var(--transition); }
        .footer-col ul a:hover { color: var(--primary-light); padding-left: 4px; }
        .footer-bottom {
            display: flex; justify-content: space-between; align-items: center;
            flex-wrap: wrap; gap: 12px; padding-top: 24px; border-top: 1px solid rgba(255,255,255,0.08);
            font-size: 0.85rem; color: rgba(255,255,255,0.5);
        }
        .footer-bottom a { color: rgba(255,255,255,0.6); }
        .footer-bottom a:hover { color: var(--primary-light); }
        @media (max-width: 900px) {
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 30px; }
            .footer-brand { grid-column: 1 / -1; }
        }
        @media (max-width: 520px) {
            .footer-grid { grid-template-columns: 1fr; gap: 24px; }
            .footer-bottom { flex-direction: column; text-align: center; }
        }

        /* ===== Responsive Article ===== */
        @media (max-width: 1024px) {
            .article-layout { grid-template-columns: 1fr; }
            .article-sidebar { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
        }
        @media (max-width: 768px) {
            .article-banner { padding: 120px 0 40px; }
            .article-body { padding: 24px 20px; border-radius: var(--radius-sm); }
            .article-tags-share { flex-direction: column; align-items: flex-start; }
            .article-sidebar { grid-template-columns: 1fr; }
        }
        @media (max-width: 520px) {
            .article-meta { gap: 12px; font-size: 0.8rem; }
            .related-grid { grid-template-columns: 1fr; }
            .cta-section .btn-group { flex-direction: column; align-items: center; }
            .cta-section .btn-primary, .cta-section .btn-outline { width: 100%; justify-content: center; }
        }

        /* ===== Utility ===== */
        .text-center { text-align: center; }
        .mt-20 { margin-top: 20px; }
        .mb-20 { margin-bottom: 20px; }
        .gap-8 { gap: 8px; }
        .flex-center { display: flex; align-items: center; justify-content: center; }