/* roulang page: index */
:root {
            --primary-bg: #060a14;
            --secondary-bg: #0b1426;
            --card-bg: rgba(255,255,255,0.04);
            --card-border: rgba(255,255,255,0.1);
            --glass-blur: 16px;
            --cyan: #00d4ff;
            --violet: #8b5cf6;
            --text-primary: #f0f4f8;
            --text-secondary: #b0c4de;
            --text-muted: #6b7280;
            --radius-card: 16px;
            --radius-btn: 8px;
            --radius-input: 4px;
            --shadow-card: 0 8px 32px rgba(0,0,0,0.4);
            --shadow-glow: 0 0 20px rgba(0,212,255,0.6);
            --nav-width: 72px;
            --header-h-mobile: 56px;
            --section-gap: 80px;
            --section-gap-mobile: 40px;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
            background: var(--primary-bg);
            color: var(--text-primary);
            line-height: 1.6;
            min-height: 100vh;
            display: flex;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: all 0.3s ease;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 8px;
        }
        button, input {
            font-family: inherit;
            border: none;
            outline: none;
            transition: all 0.3s ease;
        }
        input:focus {
            box-shadow: 0 0 0 2px rgba(0,212,255,0.4);
        }
        ::selection {
            background: rgba(0,212,255,0.3);
            color: #fff;
        }
        /* Scrollbar */
        ::-webkit-scrollbar {
            width: 6px;
        }
        ::-webkit-scrollbar-track {
            background: var(--primary-bg);
        }
        ::-webkit-scrollbar-thumb {
            background: rgba(0,212,255,0.3);
            border-radius: 3px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: rgba(0,212,255,0.5);
        }

        /* Layout */
        .app-layout {
            display: flex;
            width: 100%;
            min-height: 100vh;
        }

        /* ===== Left Nav (Desktop) ===== */
        .side-nav {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--nav-width);
            height: 100vh;
            background: rgba(11,20,38,0.92);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            border-right: 1px solid rgba(0,212,255,0.1);
            display: flex;
            flex-direction: column;
            align-items: center;
            padding: 16px 0;
            z-index: 1000;
            transition: all 0.3s ease;
        }
        .side-nav .brand {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 4px;
            margin-bottom: 28px;
            padding: 0 4px;
        }
        .side-nav .brand .logo-icon {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--cyan), var(--violet));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 16px;
            font-weight: 700;
            color: #fff;
            box-shadow: 0 0 16px rgba(0,212,255,0.3);
        }
        .side-nav .brand .logo-text {
            font-size: 11px;
            color: var(--text-primary);
            letter-spacing: 1px;
            text-align: center;
            line-height: 1.2;
            font-weight: 600;
        }
        .side-nav .nav-items {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 6px;
            flex: 1;
            width: 100%;
            padding: 0 6px;
        }
        .side-nav .nav-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            width: 56px;
            height: 52px;
            border-radius: 12px;
            color: var(--text-muted);
            font-size: 10px;
            gap: 2px;
            transition: all 0.3s ease;
            position: relative;
            cursor: pointer;
        }
        .side-nav .nav-item i {
            font-size: 18px;
            transition: all 0.3s ease;
        }
        .side-nav .nav-item span {
            font-size: 9px;
            opacity: 0;
            transform: translateY(-4px);
            transition: all 0.3s ease;
            white-space: nowrap;
            position: absolute;
            left: 60px;
            background: rgba(11,20,38,0.95);
            padding: 4px 10px;
            border-radius: 6px;
            border: 1px solid rgba(0,212,255,0.15);
            color: var(--text-primary);
            font-size: 12px;
            pointer-events: none;
        }
        .side-nav .nav-item:hover {
            color: var(--cyan);
            background: rgba(0,212,255,0.08);
        }
        .side-nav .nav-item:hover span {
            opacity: 1;
            transform: translateY(0);
        }
        .side-nav .nav-item.active {
            color: var(--cyan);
            background: rgba(0,212,255,0.1);
        }
        .side-nav .nav-item.active::before {
            content: '';
            position: absolute;
            left: -8px;
            top: 50%;
            transform: translateY(-50%);
            width: 3px;
            height: 24px;
            background: var(--cyan);
            border-radius: 0 4px 4px 0;
            box-shadow: 0 0 10px rgba(0,212,255,0.6);
        }
        .side-nav .nav-footer {
            padding-top: 12px;
            border-top: 1px solid rgba(255,255,255,0.05);
            width: 100%;
            display: flex;
            justify-content: center;
        }
        .side-nav .nav-footer a {
            color: var(--text-muted);
            font-size: 16px;
            padding: 8px;
            border-radius: 8px;
            transition: all 0.3s ease;
        }
        .side-nav .nav-footer a:hover {
            color: var(--cyan);
        }

        /* ===== Main Content ===== */
        .main-content {
            margin-left: var(--nav-width);
            width: calc(100% - var(--nav-width));
            min-height: 100vh;
        }

        /* ===== Mobile Header ===== */
        .mobile-header {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: var(--header-h-mobile);
            background: rgba(11,20,38,0.95);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            border-bottom: 1px solid rgba(0,212,255,0.08);
            z-index: 1001;
            padding: 0 16px;
            align-items: center;
            justify-content: space-between;
        }
        .mobile-header .brand-mobile {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .mobile-header .brand-mobile .logo-icon {
            width: 32px;
            height: 32px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--cyan), var(--violet));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 14px;
            font-weight: 700;
            color: #fff;
        }
        .mobile-header .brand-mobile .logo-text {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
        }
        .mobile-header .hamburger {
            width: 36px;
            height: 36px;
            border-radius: 8px;
            background: rgba(255,255,255,0.05);
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            color: var(--text-primary);
            font-size: 20px;
            transition: all 0.3s ease;
            border: 1px solid rgba(255,255,255,0.08);
        }
        .mobile-header .hamburger:hover {
            background: rgba(0,212,255,0.1);
            border-color: rgba(0,212,255,0.2);
        }

        /* Mobile Nav Overlay */
        .mobile-nav-overlay {
            display: none;
            position: fixed;
            top: var(--header-h-mobile);
            left: 0;
            width: 100%;
            height: calc(100vh - var(--header-h-mobile));
            background: rgba(11,20,38,0.98);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            z-index: 999;
            padding: 20px 16px;
            flex-direction: column;
            gap: 4px;
            overflow-y: auto;
        }
        .mobile-nav-overlay.open {
            display: flex;
        }
        .mobile-nav-overlay .m-nav-item {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 16px;
            border-radius: 12px;
            color: var(--text-secondary);
            font-size: 16px;
            transition: all 0.3s ease;
        }
        .mobile-nav-overlay .m-nav-item i {
            width: 22px;
            font-size: 18px;
        }
        .mobile-nav-overlay .m-nav-item:hover {
            background: rgba(0,212,255,0.08);
            color: var(--cyan);
        }
        .mobile-nav-overlay .m-nav-item.active {
            background: rgba(0,212,255,0.1);
            color: var(--cyan);
        }

        /* ===== Container ===== */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Section ===== */
        section {
            padding: var(--section-gap) 0;
        }
        .section-title {
            font-size: 28px;
            font-weight: 600;
            line-height: 1.3;
            margin-bottom: 12px;
            color: var(--text-primary);
        }
        .section-subtitle {
            font-size: 16px;
            color: var(--text-secondary);
            margin-bottom: 40px;
            max-width: 640px;
        }

        /* ===== Hero ===== */
        .hero {
            position: relative;
            min-height: 70vh;
            display: flex;
            align-items: center;
            background: linear-gradient(135deg, #0b1426 0%, #1a2a4a 50%, #0b1426 100%);
            overflow: hidden;
            padding: 80px 24px;
        }
        .hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background:
                radial-gradient(circle at 20% 50%, rgba(0,212,255,0.08) 0%, transparent 50%),
                radial-gradient(circle at 80% 50%, rgba(139,92,246,0.06) 0%, transparent 50%),
                url('/assets/images/backpic/back-1.png') center/cover no-repeat;
            opacity: 0.25;
            z-index: 0;
        }
        .hero::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-image: 
                linear-gradient(rgba(0,212,255,0.03) 1px, transparent 1px),
                linear-gradient(90deg, rgba(0,212,255,0.03) 1px, transparent 1px);
            background-size: 40px 40px;
            z-index: 1;
            pointer-events: none;
        }
        .hero .hero-content {
            position: relative;
            z-index: 2;
            max-width: 800px;
        }
        .hero h1 {
            font-size: 48px;
            font-weight: 700;
            line-height: 1.2;
            margin-bottom: 16px;
            text-shadow: 0 0 30px rgba(0,212,255,0.3);
        }
        .hero h1 .highlight {
            background: linear-gradient(135deg, var(--cyan), var(--violet));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero .hero-sub {
            font-size: 20px;
            color: var(--text-secondary);
            margin-bottom: 32px;
            max-width: 600px;
        }
        .hero .hero-badges {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
            margin-bottom: 32px;
        }
        .hero .hero-badges .badge {
            display: flex;
            align-items: center;
            gap: 6px;
            font-size: 14px;
            color: var(--text-secondary);
            background: rgba(255,255,255,0.06);
            padding: 6px 14px;
            border-radius: 20px;
            border: 1px solid rgba(0,212,255,0.15);
        }
        .hero .hero-badges .badge i {
            color: var(--cyan);
            font-size: 12px;
        }
        .hero .btn-group {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 40px;
            border-radius: var(--radius-btn);
            background: linear-gradient(135deg, var(--cyan), var(--violet));
            color: #fff;
            font-size: 16px;
            font-weight: 500;
            cursor: pointer;
            border: none;
            transition: all 0.3s ease;
            box-shadow: 0 0 20px rgba(0,212,255,0.3);
        }
        .btn-primary:hover {
            box-shadow: 0 0 40px rgba(0,212,255,0.6);
            transform: translateY(-2px);
        }
        .btn-primary:active {
            transform: scale(0.97);
        }
        .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            border-radius: var(--radius-btn);
            background: transparent;
            color: var(--cyan);
            font-size: 16px;
            font-weight: 500;
            cursor: pointer;
            border: 1.5px solid var(--cyan);
            transition: all 0.3s ease;
        }
        .btn-outline:hover {
            background: linear-gradient(135deg, var(--cyan), var(--violet));
            color: #fff;
            border-color: transparent;
            box-shadow: 0 0 30px rgba(0,212,255,0.4);
        }
        .btn-outline:active {
            transform: scale(0.97);
        }

        /* ===== Steps ===== */
        .steps-section {
            background: var(--secondary-bg);
        }
        .steps-grid {
            display: flex;
            gap: 24px;
            align-items: flex-start;
            justify-content: space-between;
            position: relative;
        }
        .steps-grid::before {
            content: '';
            position: absolute;
            top: 36px;
            left: 12%;
            right: 12%;
            height: 2px;
            background: linear-gradient(90deg, var(--cyan), var(--violet), var(--cyan));
            opacity: 0.3;
            z-index: 0;
        }
        .step-item {
            flex: 1;
            text-align: center;
            position: relative;
            z-index: 1;
            padding: 0 8px;
        }
        .step-item .step-number {
            width: 64px;
            height: 64px;
            border-radius: 50%;
            background: linear-gradient(135deg, rgba(0,212,255,0.15), rgba(139,92,246,0.15));
            border: 2px solid rgba(0,212,255,0.3);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            font-weight: 700;
            color: var(--cyan);
            margin: 0 auto 16px;
            position: relative;
            box-shadow: 0 0 20px rgba(0,212,255,0.15);
        }
        .step-item .step-number::after {
            content: '';
            position: absolute;
            inset: -4px;
            border-radius: 50%;
            border: 1px solid rgba(0,212,255,0.1);
            animation: pulse-ring 2s ease-in-out infinite;
        }
        @keyframes pulse-ring {
            0%, 100% { transform: scale(1); opacity: 0.5; }
            50% { transform: scale(1.08); opacity: 0.2; }
        }
        .step-item h3 {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 8px;
            color: var(--text-primary);
        }
        .step-item p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.5;
        }

        /* ===== Cases ===== */
        .cases-section {
            background: var(--primary-bg);
        }
        .case-card {
            display: flex;
            align-items: center;
            gap: 32px;
            background: var(--card-bg);
            backdrop-filter: blur(var(--glass-blur));
            -webkit-backdrop-filter: blur(var(--glass-blur));
            border: 1px solid var(--card-border);
            border-radius: var(--radius-card);
            padding: 24px;
            margin-bottom: 24px;
            transition: all 0.4s ease;
            box-shadow: var(--shadow-card);
        }
        .case-card:hover {
            border-color: rgba(0,212,255,0.2);
            transform: translateY(-4px);
            box-shadow: 0 12px 40px rgba(0,0,0,0.5);
        }
        .case-card .case-img {
            flex: 0 0 200px;
            height: 140px;
            border-radius: 12px;
            overflow: hidden;
            background: var(--secondary-bg);
        }
        .case-card .case-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .case-card .case-body {
            flex: 1;
        }
        .case-card .case-body h3 {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 6px;
        }
        .case-card .case-body .case-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 8px;
            font-size: 13px;
            color: var(--text-muted);
        }
        .case-card .case-body .case-meta .stars {
            color: #fbbf24;
            letter-spacing: 2px;
        }
        .case-card .case-body p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
        }
        .case-card:nth-child(even) {
            flex-direction: row-reverse;
        }
        .case-card:nth-child(even) .case-img {
            margin-left: 0;
            margin-right: 0;
        }

        /* ===== FAQ ===== */
        .faq-section {
            background: var(--secondary-bg);
        }
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }
        .faq-item {
            background: var(--card-bg);
            backdrop-filter: blur(var(--glass-blur));
            -webkit-backdrop-filter: blur(var(--glass-blur));
            border: 1px solid var(--card-border);
            border-radius: 12px;
            margin-bottom: 12px;
            overflow: hidden;
            transition: all 0.3s ease;
        }
        .faq-item:hover {
            border-color: rgba(0,212,255,0.2);
        }
        .faq-item .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 16px 20px;
            cursor: pointer;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-primary);
            transition: all 0.3s ease;
            gap: 12px;
        }
        .faq-item .faq-question .faq-icon {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: rgba(0,212,255,0.1);
            color: var(--cyan);
            font-size: 12px;
            flex-shrink: 0;
            transition: all 0.3s ease;
        }
        .faq-item .faq-question .arrow {
            font-size: 14px;
            color: var(--text-muted);
            transition: transform 0.3s ease;
            flex-shrink: 0;
        }
        .faq-item.open .faq-question .arrow {
            transform: rotate(180deg);
        }
        .faq-item .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 20px;
            color: var(--text-secondary);
            font-size: 14px;
            line-height: 1.7;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 20px 20px;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, #0b1426 0%, #1a2a4a 50%, #0b1426 100%);
            position: relative;
            overflow: hidden;
            text-align: center;
            padding: 80px 24px;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: radial-gradient(circle at center, rgba(0,212,255,0.06) 0%, transparent 70%);
            z-index: 0;
        }
        .cta-section .cta-content {
            position: relative;
            z-index: 1;
        }
        .cta-section h2 {
            font-size: 36px;
            font-weight: 700;
            margin-bottom: 12px;
        }
        .cta-section p {
            font-size: 18px;
            color: var(--text-secondary);
            margin-bottom: 32px;
            max-width: 500px;
            margin-left: auto;
            margin-right: auto;
        }
        .cta-section .btn-group {
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }

        /* ===== Latest Posts ===== */
        .posts-section {
            background: var(--primary-bg);
        }
        .posts-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 24px;
        }
        .post-card {
            background: var(--card-bg);
            backdrop-filter: blur(var(--glass-blur));
            -webkit-backdrop-filter: blur(var(--glass-blur));
            border: 1px solid var(--card-border);
            border-radius: var(--radius-card);
            overflow: hidden;
            transition: all 0.4s ease;
            box-shadow: var(--shadow-card);
            display: flex;
            flex-direction: column;
        }
        .post-card:hover {
            border-color: rgba(0,212,255,0.25);
            transform: translateY(-6px);
            box-shadow: 0 16px 48px rgba(0,0,0,0.5);
        }
        .post-card .post-img {
            height: 160px;
            overflow: hidden;
            background: var(--secondary-bg);
        }
        .post-card .post-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .post-card:hover .post-img img {
            transform: scale(1.05);
        }
        .post-card .post-body {
            padding: 20px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .post-card .post-body .post-tag {
            display: inline-block;
            background: rgba(0,212,255,0.15);
            color: var(--cyan);
            font-size: 11px;
            padding: 2px 10px;
            border-radius: 12px;
            margin-bottom: 8px;
            align-self: flex-start;
            font-weight: 500;
        }
        .post-card .post-body h3 {
            font-size: 16px;
            font-weight: 600;
            line-height: 1.4;
            margin-bottom: 8px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .post-card .post-body p {
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 3;
            -webkit-box-orient: vertical;
            overflow: hidden;
            flex: 1;
        }
        .post-card .post-body .post-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-top: 14px;
            font-size: 12px;
            color: var(--text-muted);
            padding-top: 12px;
            border-top: 1px solid rgba(255,255,255,0.05);
        }
        .post-card .post-body .post-meta .post-link {
            display: flex;
            align-items: center;
            gap: 4px;
            color: var(--cyan);
            font-size: 13px;
            font-weight: 500;
        }
        .post-card .post-body .post-meta .post-link i {
            font-size: 11px;
            transition: transform 0.3s ease;
        }
        .post-card:hover .post-body .post-meta .post-link i {
            transform: translateX(4px);
        }
        .posts-empty {
            grid-column: 1 / -1;
            text-align: center;
            padding: 60px 20px;
            color: var(--text-muted);
            font-size: 16px;
            background: var(--card-bg);
            backdrop-filter: blur(var(--glass-blur));
            -webkit-backdrop-filter: blur(var(--glass-blur));
            border: 1px dashed rgba(255,255,255,0.1);
            border-radius: var(--radius-card);
        }
        .posts-empty i {
            font-size: 40px;
            display: block;
            margin-bottom: 16px;
            opacity: 0.4;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: #03070e;
            border-top: 1px solid rgba(255,255,255,0.05);
            padding: 48px 24px 24px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
            max-width: 1200px;
            margin: 0 auto;
        }
        .footer-col h4 {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 16px;
        }
        .footer-col p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
        }
        .footer-col .footer-links {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .footer-col .footer-links a {
            font-size: 14px;
            color: var(--text-muted);
            transition: all 0.3s ease;
        }
        .footer-col .footer-links a:hover {
            color: var(--cyan);
        }
        .footer-col .social-links {
            display: flex;
            gap: 12px;
            margin-top: 12px;
        }
        .footer-col .social-links a {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: rgba(255,255,255,0.05);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-muted);
            font-size: 16px;
            transition: all 0.3s ease;
            border: 1px solid rgba(255,255,255,0.06);
        }
        .footer-col .social-links a:hover {
            background: rgba(0,212,255,0.1);
            color: var(--cyan);
            border-color: rgba(0,212,255,0.3);
        }
        .footer-bottom {
            max-width: 1200px;
            margin: 32px auto 0;
            padding-top: 20px;
            border-top: 1px solid rgba(255,255,255,0.04);
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 13px;
            color: var(--text-muted);
        }
        .footer-bottom a {
            color: var(--text-muted);
        }
        .footer-bottom a:hover {
            color: var(--cyan);
        }

        /* ===== Responsive ===== */
        @media (max-width: 768px) {
            body {
                flex-direction: column;
            }
            .side-nav {
                display: none;
            }
            .mobile-header {
                display: flex;
            }
            .main-content {
                margin-left: 0;
                width: 100%;
                padding-top: var(--header-h-mobile);
            }
            .hero {
                min-height: 60vh;
                padding: 48px 16px;
            }
            .hero h1 {
                font-size: 32px;
            }
            .hero .hero-sub {
                font-size: 17px;
            }
            .hero .btn-group {
                flex-direction: column;
                width: 100%;
            }
            .hero .btn-group .btn-primary,
            .hero .btn-group .btn-outline {
                width: 100%;
                justify-content: center;
            }
            section {
                padding: var(--section-gap-mobile) 0;
            }
            .section-title {
                font-size: 24px;
            }
            .steps-grid {
                flex-direction: column;
                gap: 32px;
            }
            .steps-grid::before {
                display: none;
            }
            .step-item {
                display: flex;
                align-items: center;
                text-align: left;
                gap: 16px;
                padding: 0;
            }
            .step-item .step-number {
                margin: 0;
                flex-shrink: 0;
                width: 48px;
                height: 48px;
                font-size: 18px;
            }
            .step-item .step-number::after {
                display: none;
            }
            .case-card {
                flex-direction: column !important;
                padding: 16px;
                gap: 16px;
            }
            .case-card .case-img {
                flex: 0 0 auto;
                width: 100%;
                height: 160px;
            }
            .posts-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .cta-section h2 {
                font-size: 28px;
            }
            .cta-section .btn-group {
                flex-direction: column;
                width: 100%;
            }
            .cta-section .btn-group .btn-primary,
            .cta-section .btn-group .btn-outline {
                width: 100%;
                justify-content: center;
            }
        }

        @media (min-width: 769px) and (max-width: 1024px) {
            .hero h1 {
                font-size: 38px;
            }
            .steps-grid {
                gap: 16px;
            }
            .case-card {
                padding: 20px;
                gap: 20px;
            }
            .case-card .case-img {
                flex: 0 0 160px;
                height: 120px;
            }
        }

        @media (max-width: 520px) {
            .hero h1 {
                font-size: 26px;
            }
            .hero .hero-sub {
                font-size: 15px;
            }
            .hero .hero-badges {
                flex-direction: column;
                gap: 8px;
            }
            .section-title {
                font-size: 20px;
            }
            .post-card .post-img {
                height: 130px;
            }
            .cta-section h2 {
                font-size: 24px;
            }
            .cta-section p {
                font-size: 15px;
            }
        }

/* roulang page: article */
:root {
    --cyan: #00d4ff;
    --violet: #8b5cf6;
    --deep: #0b1426;
    --deeper: #060a14;
    --glass-bg: rgba(255,255,255,0.04);
    --glass-border: rgba(255,255,255,0.08);
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --radius-card: 16px;
    --radius-btn: 8px;
    --shadow-card: 0 8px 32px rgba(0,0,0,0.4);
    --shadow-glow: 0 0 20px rgba(0,212,255,0.4);
    --font-sans: "PingFang SC","Microsoft YaHei",sans-serif;
    --font-mono: "Inter",monospace;
}
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html {
    scroll-behavior: smooth;
}
body {
    font-family: var(--font-sans);
    background: var(--deeper);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
}
a {
    color: var(--cyan);
    text-decoration: none;
    transition: color 0.2s;
}
a:hover {
    color: #fff;
}
img {
    max-width: 100%;
    height: auto;
    display: block;
    border-radius: 8px;
}
/* 左侧导航 */
.side-nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 72px;
    height: 100vh;
    background: rgba(11,20,38,0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-right: 1px solid rgba(0,212,255,0.08);
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 16px 0;
    z-index: 1000;
    transition: transform 0.3s ease;
}
.brand {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    margin-bottom: 28px;
    cursor: default;
}
.logo-icon {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--cyan), var(--violet));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: 700;
    color: #fff;
    box-shadow: 0 0 16px rgba(0,212,255,0.3);
}
.logo-text {
    font-size: 11px;
    font-weight: 600;
    color: var(--text-secondary);
    letter-spacing: 1px;
    writing-mode: vertical-rl;
    text-orientation: mixed;
}
.nav-items {
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex: 1;
    width: 100%;
    padding: 0 8px;
}
.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    padding: 10px 0;
    border-radius: 8px;
    color: var(--text-muted);
    font-size: 10px;
    transition: all 0.25s ease;
    position: relative;
    text-decoration: none;
}
.nav-item i {
    font-size: 18px;
    transition: transform 0.2s;
}
.nav-item span {
    font-size: 9px;
    opacity: 0;
    transform: translateY(-4px);
    transition: all 0.25s ease;
    pointer-events: none;
}
.nav-item:hover {
    color: var(--cyan);
    background: rgba(0,212,255,0.06);
}
.nav-item:hover i {
    transform: scale(1.1);
}
.nav-item:hover span {
    opacity: 1;
    transform: translateY(0);
}
.nav-item.active {
    color: var(--cyan);
    background: rgba(0,212,255,0.08);
}
.nav-item.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 24px;
    background: var(--cyan);
    border-radius: 0 4px 4px 0;
    box-shadow: 0 0 12px rgba(0,212,255,0.5);
}
.nav-item.active i {
    color: var(--cyan);
}
.nav-footer {
    padding-top: 12px;
    border-top: 1px solid rgba(255,255,255,0.06);
    width: 100%;
    display: flex;
    justify-content: center;
}
.nav-footer a {
    color: var(--text-muted);
    font-size: 16px;
    padding: 8px;
    border-radius: 8px;
    transition: all 0.25s;
}
.nav-footer a:hover {
    color: var(--cyan);
    background: rgba(0,212,255,0.06);
}
/* 右侧主区域 */
.main-wrapper {
    margin-left: 72px;
    flex: 1;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}
.article-container {
    max-width: 960px;
    width: 100%;
    margin: 0 auto;
    padding: 40px 32px 60px;
    flex: 1;
}
/* 面包屑 */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 32px;
    padding: 10px 16px;
    background: rgba(255,255,255,0.03);
    border-radius: 8px;
    border: 1px solid rgba(255,255,255,0.04);
}
.breadcrumb a {
    color: var(--text-muted);
    transition: color 0.2s;
}
.breadcrumb a:hover {
    color: var(--cyan);
}
.breadcrumb .sep {
    color: var(--text-muted);
    opacity: 0.4;
}
.breadcrumb .current {
    color: var(--text-secondary);
    max-width: 240px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
/* 文章头部 */
.article-header {
    margin-bottom: 32px;
    padding-bottom: 24px;
    border-bottom: 1px solid rgba(255,255,255,0.06);
}
.article-header h1 {
    font-size: 32px;
    font-weight: 700;
    line-height: 1.3;
    color: #fff;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}
.article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 16px 24px;
    font-size: 14px;
    color: var(--text-secondary);
}
.article-meta span {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}
.article-meta i {
    color: var(--cyan);
    opacity: 0.7;
    font-size: 13px;
}
.article-category-tag {
    display: inline-block;
    padding: 2px 14px;
    border-radius: 20px;
    background: rgba(0,212,255,0.12);
    color: var(--cyan);
    font-size: 12px;
    font-weight: 500;
    border: 1px solid rgba(0,212,255,0.2);
}
/* 正文 */
.article-body {
    font-size: 16px;
    line-height: 1.8;
    color: var(--text-primary);
    max-width: 800px;
}
.article-body h2 {
    font-size: 24px;
    font-weight: 700;
    margin: 40px 0 16px;
    color: #fff;
    line-height: 1.3;
}
.article-body h3 {
    font-size: 20px;
    font-weight: 600;
    margin: 32px 0 12px;
    color: #e2e8f0;
    line-height: 1.4;
}
.article-body p {
    margin-bottom: 20px;
    color: var(--text-secondary);
}
.article-body ul, .article-body ol {
    margin: 16px 0 24px;
    padding-left: 24px;
    color: var(--text-secondary);
}
.article-body li {
    margin-bottom: 8px;
}
.article-body blockquote {
    margin: 24px 0;
    padding: 16px 24px;
    border-left: 4px solid var(--cyan);
    background: rgba(0,212,255,0.04);
    border-radius: 0 8px 8px 0;
    color: var(--text-secondary);
    font-style: italic;
}
.article-body img {
    margin: 24px auto;
    border-radius: 12px;
    box-shadow: var(--shadow-card);
}
.article-body a {
    color: var(--cyan);
    text-decoration: underline;
    text-underline-offset: 2px;
}
.article-body a:hover {
    color: #fff;
}
/* 相关推荐 */
.related-section {
    margin-top: 56px;
    padding-top: 32px;
    border-top: 1px solid rgba(255,255,255,0.06);
}
.related-section h2 {
    font-size: 22px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 10px;
}
.related-section h2 i {
    color: var(--cyan);
}
.related-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}
.related-card {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-card);
    overflow: hidden;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-card);
}
.related-card:hover {
    transform: translateY(-4px);
    border-color: rgba(0,212,255,0.2);
    box-shadow: 0 12px 40px rgba(0,0,0,0.5);
}
.related-card img {
    width: 100%;
    height: 160px;
    object-fit: cover;
    border-radius: 0;
}
.related-card .card-body {
    padding: 16px 18px 20px;
}
.related-card .card-body h3 {
    font-size: 15px;
    font-weight: 600;
    color: #e2e8f0;
    margin-bottom: 8px;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.related-card .card-body p {
    font-size: 13px;
    color: var(--text-muted);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
/* 返回按钮 */
.back-link-wrap {
    margin-top: 40px;
    text-align: center;
}
/* 无文章状态 */
.not-found-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 80px 20px;
    text-align: center;
}
.not-found-container i {
    font-size: 48px;
    color: var(--text-muted);
    margin-bottom: 20px;
    opacity: 0.5;
}
.not-found-container h2 {
    font-size: 24px;
    color: var(--text-secondary);
    margin-bottom: 12px;
}
.not-found-container p {
    color: var(--text-muted);
    margin-bottom: 24px;
}
/* 页脚 */
.site-footer {
    background: #03070e;
    border-top: 1px solid rgba(255,255,255,0.04);
    padding: 48px 32px 24px;
    margin-left: 72px;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1.5fr;
    gap: 40px;
    max-width: 1200px;
    margin: 0 auto 32px;
}
.footer-col h4 {
    font-size: 16px;
    font-weight: 600;
    color: #e2e8f0;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
}
.footer-col p {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.7;
}
.footer-links {
    list-style: none;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.footer-links a {
    color: var(--text-muted);
    font-size: 14px;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}
.footer-links a:hover {
    color: var(--cyan);
    padding-left: 4px;
}
.social-links {
    display: flex;
    gap: 12px;
    margin-top: 12px;
}
.social-links a {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(255,255,255,0.04);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 16px;
    transition: all 0.25s;
    border: 1px solid rgba(255,255,255,0.06);
}
.social-links a:hover {
    background: rgba(0,212,255,0.12);
    color: var(--cyan);
    border-color: rgba(0,212,255,0.2);
    transform: translateY(-2px);
}
.footer-bottom {
    max-width: 1200px;
    margin: 0 auto;
    padding-top: 20px;
    border-top: 1px solid rgba(255,255,255,0.04);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    font-size: 13px;
    color: var(--text-muted);
}
.footer-bottom a {
    color: var(--text-muted);
}
.footer-bottom a:hover {
    color: var(--cyan);
}
/* 移动端导航 */
.mobile-topbar {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 56px;
    background: rgba(11,20,38,0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(0,212,255,0.08);
    z-index: 999;
    padding: 0 16px;
    align-items: center;
    justify-content: space-between;
}
.mobile-topbar .brand-row {
    display: flex;
    align-items: center;
    gap: 10px;
}
.mobile-topbar .brand-row .logo-icon {
    width: 28px;
    height: 28px;
    font-size: 14px;
}
.mobile-topbar .brand-row .logo-text-row {
    font-size: 15px;
    font-weight: 600;
    color: #e2e8f0;
}
.mobile-topbar .hamburger {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 22px;
    cursor: pointer;
    padding: 6px;
    border-radius: 6px;
    transition: all 0.2s;
}
.mobile-topbar .hamburger:hover {
    background: rgba(255,255,255,0.06);
    color: var(--cyan);
}
.mobile-menu-overlay {
    display: none;
    position: fixed;
    top: 56px;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(6,10,20,0.96);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    z-index: 998;
    flex-direction: column;
    padding: 20px 24px;
    gap: 8px;
    overflow-y: auto;
}
.mobile-menu-overlay.open {
    display: flex;
}
.mobile-menu-overlay .nav-item {
    flex-direction: row;
    gap: 12px;
    padding: 14px 16px;
    font-size: 15px;
    border-radius: 12px;
}
.mobile-menu-overlay .nav-item i {
    font-size: 20px;
}
.mobile-menu-overlay .nav-item span {
    opacity: 1;
    transform: none;
    font-size: 15px;
    pointer-events: auto;
}
.mobile-menu-overlay .nav-item.active {
    background: rgba(0,212,255,0.1);
}
.mobile-menu-overlay .nav-item.active::before {
    display: none;
}
/* 响应式 */
@media (max-width: 768px) {
    .side-nav {
        display: none;
    }
    .mobile-topbar {
        display: flex;
    }
    .main-wrapper {
        margin-left: 0;
        padding-top: 56px;
    }
    .site-footer {
        margin-left: 0;
    }
    .article-container {
        padding: 24px 16px 40px;
    }
    .article-header h1 {
        font-size: 24px;
    }
    .article-meta {
        gap: 10px 16px;
        font-size: 13px;
    }
    .related-grid {
        grid-template-columns: 1fr;
    }
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 28px;
    }
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}
@media (max-width: 520px) {
    .article-header h1 {
        font-size: 20px;
    }
    .article-body {
        font-size: 15px;
    }
    .breadcrumb {
        font-size: 12px;
        padding: 8px 12px;
    }
    .breadcrumb .current {
        max-width: 140px;
    }
}
/* 自定义滚动条 */
::-webkit-scrollbar {
    width: 6px;
}
::-webkit-scrollbar-track {
    background: var(--deeper);
}
::-webkit-scrollbar-thumb {
    background: rgba(0,212,255,0.15);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(0,212,255,0.3);
}
/* 文章内容中代码风格 */
.article-body code {
    background: rgba(255,255,255,0.06);
    padding: 2px 8px;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.9em;
    color: var(--cyan);
}
.article-body pre {
    background: rgba(0,0,0,0.3);
    padding: 20px;
    border-radius: 12px;
    overflow-x: auto;
    border: 1px solid rgba(255,255,255,0.06);
    margin: 24px 0;
}
.article-body pre code {
    background: none;
    padding: 0;
    color: inherit;
}
/* 阅读量动画 */
.read-count {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

/* roulang page: category1 */
:root {
            --deep-blue: #0b1426;
            --card-bg: #1a2a4a;
            --cyan: #00d4ff;
            --violet: #8b5cf6;
            --bg-dark: #060a14;
            --text-primary: #f0f4ff;
            --text-secondary: #b0c4de;
            --text-muted: #6b7280;
            --border-light: rgba(255, 255, 255, 0.1);
            --glass-bg: rgba(255, 255, 255, 0.04);
            --radius-card: 16px;
            --radius-btn: 8px;
            --radius-input: 4px;
            --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
            --shadow-glow: 0 0 20px rgba(0, 212, 255, 0.6);
            --font-cn: "PingFang SC", "Microsoft YaHei", sans-serif;
            --font-en: "Inter", monospace;
            --spacing-section: 80px;
            --nav-width: 72px;
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: var(--font-cn);
            background: var(--bg-dark);
            color: var(--text-primary);
            line-height: 1.6;
            font-size: 16px;
            min-height: 100vh;
            display: flex;
        }
        a {
            color: var(--cyan);
            text-decoration: none;
            transition: color 0.3s ease;
        }
        a:hover {
            color: #66e5ff;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-card);
        }
        button,
        input {
            font-family: inherit;
            font-size: inherit;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }
        /* ===== 左侧导航 ===== */
        .side-nav {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--nav-width);
            height: 100vh;
            background: rgba(11, 20, 38, 0.95);
            backdrop-filter: blur(12px);
            border-right: 1px solid var(--border-light);
            display: flex;
            flex-direction: column;
            align-items: center;
            padding: 16px 0;
            z-index: 1000;
            transition: transform 0.3s ease;
        }
        .side-nav .brand {
            display: flex;
            flex-direction: column;
            align-items: center;
            margin-bottom: 24px;
        }
        .side-nav .logo-icon {
            width: 36px;
            height: 36px;
            background: linear-gradient(135deg, var(--cyan), var(--violet));
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            font-weight: 700;
            color: #fff;
            box-shadow: 0 0 16px rgba(0, 212, 255, 0.3);
        }
        .side-nav .logo-text {
            font-size: 12px;
            color: var(--text-secondary);
            margin-top: 6px;
            letter-spacing: 0.5px;
            white-space: nowrap;
            writing-mode: vertical-lr;
            text-orientation: mixed;
        }
        .side-nav .nav-items {
            display: flex;
            flex-direction: column;
            gap: 4px;
            width: 100%;
            padding: 0 8px;
            flex: 1;
        }
        .side-nav .nav-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            padding: 10px 4px;
            border-radius: 8px;
            color: var(--text-secondary);
            font-size: 11px;
            transition: all 0.3s ease;
            position: relative;
            text-decoration: none;
        }
        .side-nav .nav-item i {
            font-size: 18px;
            margin-bottom: 4px;
            transition: transform 0.3s ease;
        }
        .side-nav .nav-item span {
            font-size: 10px;
            opacity: 0;
            transition: opacity 0.3s ease;
            white-space: nowrap;
        }
        .side-nav .nav-item:hover,
        .side-nav .nav-item.active {
            color: var(--cyan);
            background: rgba(0, 212, 255, 0.08);
        }
        .side-nav .nav-item:hover span,
        .side-nav .nav-item.active span {
            opacity: 1;
        }
        .side-nav .nav-item.active::before {
            content: '';
            position: absolute;
            left: -8px;
            top: 50%;
            transform: translateY(-50%);
            width: 3px;
            height: 24px;
            background: var(--cyan);
            border-radius: 0 3px 3px 0;
            box-shadow: 0 0 12px rgba(0, 212, 255, 0.6);
        }
        .side-nav .nav-item:hover i {
            transform: scale(1.1);
        }
        .side-nav .nav-footer {
            padding: 12px 0;
            display: flex;
            flex-direction: column;
            gap: 12px;
            align-items: center;
        }
        .side-nav .nav-footer a {
            color: var(--text-muted);
            font-size: 16px;
            transition: color 0.3s ease;
        }
        .side-nav .nav-footer a:hover {
            color: var(--cyan);
        }
        /* ===== 移动端顶部导航 ===== */
        .mobile-header {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: 56px;
            background: rgba(11, 20, 38, 0.95);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-light);
            z-index: 1001;
            padding: 0 16px;
            align-items: center;
            justify-content: space-between;
        }
        .mobile-header .brand-row {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .mobile-header .logo-icon {
            width: 32px;
            height: 32px;
            background: linear-gradient(135deg, var(--cyan), var(--violet));
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 16px;
            font-weight: 700;
            color: #fff;
        }
        .mobile-header .brand-text {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
        }
        .mobile-header .hamburger {
            background: none;
            border: none;
            color: var(--text-primary);
            font-size: 24px;
            cursor: pointer;
            padding: 4px 8px;
            border-radius: 4px;
            transition: background 0.3s ease;
        }
        .mobile-header .hamburger:hover {
            background: rgba(255, 255, 255, 0.05);
        }
        .mobile-menu {
            display: none;
            position: fixed;
            top: 56px;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(6, 10, 20, 0.98);
            backdrop-filter: blur(16px);
            z-index: 999;
            padding: 24px 16px;
            flex-direction: column;
            gap: 8px;
            overflow-y: auto;
        }
        .mobile-menu.open {
            display: flex;
        }
        .mobile-menu a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 14px 16px;
            border-radius: 8px;
            color: var(--text-secondary);
            font-size: 16px;
            text-decoration: none;
            transition: all 0.3s ease;
        }
        .mobile-menu a i {
            font-size: 18px;
            width: 24px;
            text-align: center;
        }
        .mobile-menu a:hover,
        .mobile-menu a.active {
            background: rgba(0, 212, 255, 0.08);
            color: var(--cyan);
        }
        .mobile-menu a.active {
            border-left: 3px solid var(--cyan);
        }
        /* ===== 主内容区 ===== */
        .main-content {
            margin-left: var(--nav-width);
            width: calc(100% - var(--nav-width));
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        /* ===== Hero ===== */
        .hero-section {
            position: relative;
            min-height: 50vh;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            padding: 80px 24px 60px;
            background: linear-gradient(135deg, #0b1426 0%, #1a2a4a 50%, #0b1426 100%);
            overflow: hidden;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.20;
            z-index: 0;
            animation: heroPulse 8s ease-in-out infinite alternate;
        }
        @keyframes heroPulse {
            0% {
                transform: scale(1);
                opacity: 0.18;
            }
            100% {
                transform: scale(1.05);
                opacity: 0.28;
            }
        }
        .hero-section .hero-overlay {
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at center, rgba(0, 212, 255, 0.05) 0%, transparent 70%);
            z-index: 1;
        }
        .hero-section .hero-content {
            position: relative;
            z-index: 2;
            max-width: 800px;
        }
        .hero-section h1 {
            font-size: 48px;
            font-weight: 700;
            line-height: 1.2;
            margin-bottom: 16px;
            color: #fff;
            text-shadow: 0 0 30px rgba(0, 212, 255, 0.3);
        }
        .hero-section h1 .highlight {
            background: linear-gradient(135deg, var(--cyan), var(--violet));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero-section .hero-sub {
            font-size: 20px;
            color: var(--text-secondary);
            margin-bottom: 32px;
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
        }
        .hero-section .hero-actions {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 40px;
            background: linear-gradient(135deg, var(--cyan), var(--violet));
            color: #fff;
            border: none;
            border-radius: var(--radius-btn);
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 0 20px rgba(0, 212, 255, 0.3);
            text-decoration: none;
        }
        .btn-primary:hover {
            box-shadow: 0 0 40px rgba(0, 212, 255, 0.7);
            transform: translateY(-2px);
            color: #fff;
        }
        .btn-primary:active {
            transform: scale(0.97);
        }
        .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 40px;
            background: transparent;
            color: var(--cyan);
            border: 1.5px solid var(--cyan);
            border-radius: var(--radius-btn);
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            text-decoration: none;
        }
        .btn-outline:hover {
            background: rgba(0, 212, 255, 0.1);
            box-shadow: 0 0 20px rgba(0, 212, 255, 0.3);
            color: var(--cyan);
            transform: translateY(-2px);
        }
        .btn-outline:active {
            transform: scale(0.97);
        }
        .btn-sm {
            padding: 10px 24px;
            font-size: 14px;
        }
        /* ===== 板块通用 ===== */
        .section-block {
            padding: var(--spacing-section) 24px;
        }
        .section-title {
            font-size: 28px;
            font-weight: 700;
            line-height: 1.3;
            margin-bottom: 12px;
            text-align: center;
        }
        .section-sub {
            font-size: 16px;
            color: var(--text-secondary);
            text-align: center;
            max-width: 640px;
            margin: 0 auto 48px;
        }
        .section-title .highlight {
            background: linear-gradient(135deg, var(--cyan), var(--violet));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        /* ===== 游戏推荐卡片网格 ===== */
        .game-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 24px;
        }
        .game-card {
            background: var(--glass-bg);
            backdrop-filter: blur(16px);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-card);
            padding: 20px;
            transition: all 0.4s ease;
            box-shadow: var(--shadow-card);
            cursor: default;
        }
        .game-card:hover {
            transform: translateY(-6px);
            border-color: rgba(0, 212, 255, 0.3);
            box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5), 0 0 20px rgba(0, 212, 255, 0.1);
        }
        .game-card .card-img {
            width: 100%;
            height: 160px;
            object-fit: cover;
            border-radius: 12px;
            margin-bottom: 14px;
            background: var(--card-bg);
        }
        .game-card .card-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
            margin-bottom: 10px;
        }
        .game-card .tag {
            display: inline-block;
            padding: 2px 12px;
            background: rgba(0, 212, 255, 0.15);
            color: var(--cyan);
            border-radius: 20px;
            font-size: 12px;
            font-weight: 500;
        }
        .game-card .tag.violet {
            background: rgba(139, 92, 246, 0.15);
            color: var(--violet);
        }
        .game-card h3 {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 6px;
            color: var(--text-primary);
        }
        .game-card .rating {
            display: flex;
            align-items: center;
            gap: 6px;
            font-size: 14px;
            color: #fbbf24;
            margin-bottom: 8px;
        }
        .game-card .rating span {
            color: var(--text-secondary);
            font-size: 13px;
        }
        .game-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        /* ===== 游戏类型特色 ===== */
        .type-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
            gap: 24px;
        }
        .type-card {
            background: var(--glass-bg);
            backdrop-filter: blur(12px);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-card);
            padding: 28px 20px;
            text-align: center;
            transition: all 0.4s ease;
        }
        .type-card:hover {
            transform: translateY(-4px);
            border-color: rgba(0, 212, 255, 0.2);
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
        }
        .type-card .icon-circle {
            width: 56px;
            height: 56px;
            border-radius: 50%;
            margin: 0 auto 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            background: linear-gradient(135deg, rgba(0, 212, 255, 0.15), rgba(139, 92, 246, 0.15));
            color: var(--cyan);
        }
        .type-card h3 {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 8px;
        }
        .type-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
        }
        /* ===== 玩家评价 ===== */
        .review-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 24px;
        }
        .review-card {
            background: var(--glass-bg);
            backdrop-filter: blur(12px);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-card);
            padding: 24px;
            transition: all 0.3s ease;
        }
        .review-card:hover {
            border-color: rgba(0, 212, 255, 0.2);
        }
        .review-card .review-stars {
            color: #fbbf24;
            font-size: 14px;
            margin-bottom: 10px;
        }
        .review-card blockquote {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            font-style: italic;
            margin-bottom: 12px;
        }
        .review-card .reviewer {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .review-card .reviewer .avatar {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--cyan), var(--violet));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 14px;
            font-weight: 600;
            color: #fff;
        }
        .review-card .reviewer .name {
            font-size: 13px;
            font-weight: 500;
            color: var(--text-primary);
        }
        .review-card .reviewer .source {
            font-size: 12px;
            color: var(--text-muted);
        }
        /* ===== FAQ ===== */
        .faq-list {
            max-width: 740px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--glass-bg);
            backdrop-filter: blur(12px);
            border: 1px solid var(--border-light);
            border-radius: 12px;
            overflow: hidden;
            transition: border-color 0.3s ease;
        }
        .faq-item:hover {
            border-color: rgba(0, 212, 255, 0.15);
        }
        .faq-item .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 16px 20px;
            cursor: pointer;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-primary);
            transition: background 0.3s ease;
            user-select: none;
            gap: 12px;
        }
        .faq-item .faq-question:hover {
            background: rgba(255, 255, 255, 0.02);
        }
        .faq-item .faq-question .icon-left {
            color: var(--cyan);
            font-size: 16px;
            flex-shrink: 0;
        }
        .faq-item .faq-question .arrow {
            color: var(--text-muted);
            transition: transform 0.3s ease;
            flex-shrink: 0;
            font-size: 14px;
        }
        .faq-item.open .faq-question .arrow {
            transform: rotate(180deg);
            color: var(--cyan);
        }
        .faq-item .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 20px;
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 20px 16px;
        }
        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, #0b1426 0%, #1a2a4a 50%, #0b1426 100%);
            padding: 80px 24px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-3.webp') center center / cover no-repeat;
            opacity: 0.08;
            z-index: 0;
        }
        .cta-section .cta-content {
            position: relative;
            z-index: 1;
            max-width: 640px;
            margin: 0 auto;
        }
        .cta-section h2 {
            font-size: 32px;
            font-weight: 700;
            margin-bottom: 12px;
        }
        .cta-section p {
            font-size: 16px;
            color: var(--text-secondary);
            margin-bottom: 32px;
        }
        .cta-section .cta-actions {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }
        /* ===== 页脚 ===== */
        .site-footer {
            background: #03070e;
            border-top: 1px solid var(--border-light);
            padding: 48px 24px 24px;
        }
        .site-footer .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1.5fr;
            gap: 32px;
            max-width: 1200px;
            margin: 0 auto 32px;
        }
        .site-footer .footer-col h4 {
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 12px;
            color: var(--text-primary);
        }
        .site-footer .footer-col p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
        }
        .site-footer .footer-links {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 6px;
        }
        .site-footer .footer-links a {
            color: var(--text-muted);
            font-size: 14px;
            transition: color 0.3s ease;
        }
        .site-footer .footer-links a:hover {
            color: var(--cyan);
        }
        .site-footer .social-links {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
            margin-top: 8px;
        }
        .site-footer .social-links a {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.04);
            color: var(--text-muted);
            font-size: 18px;
            transition: all 0.3s ease;
        }
        .site-footer .social-links a:hover {
            background: rgba(0, 212, 255, 0.12);
            color: var(--cyan);
            transform: translateY(-2px);
        }
        .site-footer .footer-bottom {
            max-width: 1200px;
            margin: 0 auto;
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.04);
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 13px;
            color: var(--text-muted);
        }
        .site-footer .footer-bottom a {
            color: var(--text-muted);
        }
        .site-footer .footer-bottom a:hover {
            color: var(--cyan);
        }
        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .site-footer .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .hero-section h1 {
                font-size: 36px;
            }
        }
        @media (max-width: 768px) {
            :root {
                --spacing-section: 48px;
                --nav-width: 0px;
            }
            .side-nav {
                transform: translateX(-100%);
            }
            .mobile-header {
                display: flex;
            }
            .main-content {
                margin-left: 0;
                width: 100%;
                padding-top: 56px;
            }
            .hero-section {
                min-height: 40vh;
                padding: 60px 16px 40px;
            }
            .hero-section h1 {
                font-size: 28px;
            }
            .hero-section .hero-sub {
                font-size: 16px;
            }
            .section-block {
                padding: var(--spacing-section) 16px;
            }
            .section-title {
                font-size: 24px;
            }
            .game-grid {
                grid-template-columns: 1fr;
            }
            .type-grid {
                grid-template-columns: 1fr 1fr;
            }
            .review-grid {
                grid-template-columns: 1fr;
            }
            .site-footer .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .site-footer .footer-bottom {
                flex-direction: column;
                align-items: center;
                text-align: center;
            }
            .btn-primary,
            .btn-outline {
                padding: 12px 28px;
                font-size: 14px;
            }
            .cta-section h2 {
                font-size: 24px;
            }
            .cta-section {
                padding: 48px 16px;
            }
            .hero-section .hero-actions {
                flex-direction: column;
                align-items: center;
            }
            .hero-section .hero-actions .btn-primary,
            .hero-section .hero-actions .btn-outline {
                width: 100%;
                max-width: 280px;
                justify-content: center;
            }
            .faq-item .faq-question {
                font-size: 14px;
                padding: 14px 16px;
            }
            .faq-item .faq-answer {
                font-size: 13px;
            }
            .type-grid {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 520px) {
            .hero-section h1 {
                font-size: 24px;
            }
            .hero-section .hero-sub {
                font-size: 14px;
            }
            .section-title {
                font-size: 20px;
            }
            .game-card .card-img {
                height: 140px;
            }
            .game-card h3 {
                font-size: 16px;
            }
        }
        /* ===== 微交互 ===== */
        .fade-in {
            opacity: 0;
            transform: translateY(20px);
            animation: fadeUp 0.6s ease forwards;
        }
        @keyframes fadeUp {
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .fade-in:nth-child(2) {
            animation-delay: 0.1s;
        }
        .fade-in:nth-child(3) {
            animation-delay: 0.2s;
        }
        .fade-in:nth-child(4) {
            animation-delay: 0.3s;
        }
        .fade-in:nth-child(5) {
            animation-delay: 0.4s;
        }
        .fade-in:nth-child(6) {
            animation-delay: 0.5s;
        }
        /* ===== 滚动条 ===== */
        ::-webkit-scrollbar {
            width: 6px;
        }
        ::-webkit-scrollbar-track {
            background: var(--bg-dark);
        }
        ::-webkit-scrollbar-thumb {
            background: rgba(0, 212, 255, 0.2);
            border-radius: 3px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: rgba(0, 212, 255, 0.4);
        }
        /* ===== 面包屑 ===== */
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 16px 24px 0;
            font-size: 13px;
            color: var(--text-muted);
            max-width: 1200px;
            margin: 0 auto;
            width: 100%;
        }
        .breadcrumb a {
            color: var(--text-muted);
        }
        .breadcrumb a:hover {
            color: var(--cyan);
        }
        .breadcrumb .sep {
            color: var(--text-muted);
            font-size: 12px;
        }
        .breadcrumb .current {
            color: var(--text-secondary);
        }
        @media (max-width:768px) {
            .breadcrumb {
                padding: 12px 16px 0;
                font-size: 12px;
            }
        }

/* roulang page: category2 */
:root {
            --primary: #0b1426;
            --primary-light: #1a2a4a;
            --cyan: #00d4ff;
            --violet: #8b5cf6;
            --bg-body: #060a14;
            --text-white: #f0f4ff;
            --text-muted: #6b7280;
            --text-soft: #b0c4de;
            --border-glass: rgba(255, 255, 255, 0.1);
            --glass-bg: rgba(255, 255, 255, 0.04);
            --radius-card: 16px;
            --radius-btn: 8px;
            --radius-input: 4px;
            --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
            --shadow-glow: 0 0 20px rgba(0, 212, 255, 0.6);
            --font-cn: "PingFang SC", "Microsoft YaHei", sans-serif;
            --font-en: "Inter", monospace;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-cn);
            background: var(--bg-body);
            color: var(--text-white);
            line-height: 1.6;
            min-height: 100vh;
            display: flex;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: all 0.3s ease;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 8px;
        }

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

        /* layout */
        .layout-wrapper {
            display: flex;
            width: 100%;
            min-height: 100vh;
        }

        .side-nav {
            position: fixed;
            top: 0;
            left: 0;
            width: 72px;
            height: 100vh;
            background: rgba(11, 20, 38, 0.92);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-right: 1px solid rgba(0, 212, 255, 0.1);
            display: flex;
            flex-direction: column;
            align-items: center;
            padding: 16px 0;
            z-index: 1000;
            transition: width 0.3s ease;
        }

        .side-nav:hover {
            width: 200px;
        }

        .side-nav .brand {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 0 12px;
            margin-bottom: 28px;
            width: 100%;
            justify-content: center;
        }

        .side-nav .logo-icon {
            width: 36px;
            height: 36px;
            background: linear-gradient(135deg, var(--cyan), var(--violet));
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 18px;
            color: #fff;
            flex-shrink: 0;
            box-shadow: 0 0 16px rgba(0, 212, 255, 0.3);
        }

        .side-nav .logo-text {
            font-size: 14px;
            font-weight: 600;
            color: #fff;
            white-space: nowrap;
            opacity: 0;
            transition: opacity 0.3s ease;
        }

        .side-nav:hover .logo-text {
            opacity: 1;
        }

        .nav-items {
            flex: 1;
            display: flex;
            flex-direction: column;
            gap: 4px;
            width: 100%;
            padding: 0 8px;
        }

        .nav-item {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 14px;
            border-radius: 10px;
            color: var(--text-soft);
            font-size: 14px;
            font-weight: 500;
            white-space: nowrap;
            transition: all 0.3s ease;
            position: relative;
        }

        .nav-item i {
            font-size: 18px;
            width: 20px;
            text-align: center;
            flex-shrink: 0;
        }

        .nav-item span {
            opacity: 0;
            transition: opacity 0.3s ease;
        }

        .side-nav:hover .nav-item span {
            opacity: 1;
        }

        .nav-item:hover,
        .nav-item.active {
            background: rgba(0, 212, 255, 0.1);
            color: var(--cyan);
        }

        .nav-item.active::before {
            content: '';
            position: absolute;
            left: -8px;
            top: 50%;
            transform: translateY(-50%);
            width: 3px;
            height: 20px;
            background: var(--cyan);
            border-radius: 0 4px 4px 0;
            box-shadow: 0 0 12px rgba(0, 212, 255, 0.6);
        }

        .nav-footer {
            padding: 16px 0;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 12px;
            width: 100%;
        }

        .nav-footer a {
            color: var(--text-muted);
            font-size: 16px;
            padding: 6px;
            border-radius: 6px;
            transition: all 0.3s ease;
        }

        .nav-footer a:hover {
            color: var(--cyan);
        }

        /* main content */
        .main-content {
            margin-left: 72px;
            flex: 1;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }

        /* section spacing */
        .section {
            padding: 80px 0;
        }

        .section+.section {
            border-top: 1px solid rgba(255, 255, 255, 0.04);
        }

        /* glass card */
        .glass-card {
            background: var(--glass-bg);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            padding: 24px;
            transition: all 0.4s ease;
        }

        .glass-card:hover {
            background: rgba(255, 255, 255, 0.07);
            transform: translateY(-2px);
            box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
        }

        /* buttons */
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 36px;
            background: linear-gradient(135deg, var(--cyan), var(--violet));
            color: #fff;
            font-weight: 600;
            font-size: 15px;
            border-radius: var(--radius-btn);
            border: none;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 4px 16px rgba(0, 212, 255, 0.3);
        }

        .btn-primary:hover {
            box-shadow: 0 0 30px rgba(0, 212, 255, 0.8);
            transform: translateY(-1px);
        }

        .btn-primary:active {
            transform: scale(0.97);
        }

        .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 13px 34px;
            background: transparent;
            color: var(--cyan);
            font-weight: 600;
            font-size: 15px;
            border-radius: var(--radius-btn);
            border: 1.5px solid var(--cyan);
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .btn-outline:hover {
            background: linear-gradient(135deg, var(--cyan), var(--violet));
            color: #fff;
            border-color: transparent;
            box-shadow: 0 0 20px rgba(0, 212, 255, 0.4);
        }

        .btn-outline:active {
            transform: scale(0.97);
        }

        /* badge / tag */
        .badge {
            display: inline-block;
            padding: 4px 14px;
            background: rgba(0, 212, 255, 0.15);
            color: var(--cyan);
            font-size: 13px;
            font-weight: 500;
            border-radius: 20px;
            border: 1px solid rgba(0, 212, 255, 0.25);
        }

        /* headings */
        .heading-1 {
            font-size: 40px;
            font-weight: 700;
            line-height: 1.2;
            letter-spacing: -0.01em;
        }

        .heading-2 {
            font-size: 28px;
            font-weight: 600;
            line-height: 1.3;
        }

        .heading-3 {
            font-size: 20px;
            font-weight: 500;
            line-height: 1.4;
        }

        .text-body {
            font-size: 16px;
            line-height: 1.8;
            color: var(--text-soft);
        }

        .text-small {
            font-size: 14px;
            line-height: 1.6;
            color: var(--text-muted);
        }

        /* hero */
        .hero-section {
            padding: 100px 0 80px;
            background: linear-gradient(135deg, #060a14 0%, #0b1426 40%, #1a2a4a 100%);
            position: relative;
            overflow: hidden;
            min-height: 60vh;
            display: flex;
            align-items: center;
        }

        .hero-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
            opacity: 0.12;
            z-index: 0;
        }

        .hero-section::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: radial-gradient(circle at 30% 40%, rgba(0, 212, 255, 0.08) 0%, transparent 60%),
                radial-gradient(circle at 70% 60%, rgba(139, 92, 246, 0.06) 0%, transparent 50%);
            z-index: 1;
        }

        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 800px;
        }

        .hero-content .heading-1 {
            font-size: 44px;
            margin-bottom: 16px;
            text-shadow: 0 0 20px rgba(0, 212, 255, 0.3);
        }

        .hero-content .heading-1 span {
            background: linear-gradient(135deg, var(--cyan), var(--violet));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero-content .hero-sub {
            font-size: 18px;
            color: var(--text-soft);
            margin-bottom: 28px;
            max-width: 600px;
        }

        /* step flow */
        .step-flow {
            display: flex;
            align-items: flex-start;
            gap: 40px;
            flex-wrap: wrap;
            justify-content: center;
        }

        .step-item {
            flex: 1;
            min-width: 200px;
            max-width: 280px;
            text-align: center;
            position: relative;
        }

        .step-number {
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--cyan), var(--violet));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            font-weight: 700;
            color: #fff;
            margin: 0 auto 16px;
            box-shadow: 0 0 24px rgba(0, 212, 255, 0.3);
            position: relative;
            z-index: 2;
        }

        .step-item::after {
            content: '→';
            position: absolute;
            top: 24px;
            right: -28px;
            font-size: 24px;
            color: rgba(0, 212, 255, 0.3);
            font-weight: 300;
            z-index: 1;
        }

        .step-item:last-child::after {
            display: none;
        }

        .step-item h3 {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 8px;
            color: #fff;
        }

        .step-item p {
            font-size: 14px;
            color: var(--text-soft);
            line-height: 1.7;
        }

        /* scene cards */
        .scene-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 24px;
        }

        .scene-card {
            background: var(--glass-bg);
            backdrop-filter: blur(16px);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-card);
            padding: 32px 24px 24px;
            text-align: center;
            transition: all 0.4s ease;
        }

        .scene-card:hover {
            background: rgba(255, 255, 255, 0.07);
            transform: translateY(-3px);
            box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
        }

        .scene-card .icon-wrap {
            width: 64px;
            height: 64px;
            border-radius: 16px;
            background: rgba(0, 212, 255, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px;
            font-size: 28px;
            color: var(--cyan);
        }

        .scene-card h3 {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 8px;
        }

        .scene-card p {
            font-size: 14px;
            color: var(--text-soft);
            line-height: 1.7;
        }

        /* FAQ */
        .faq-list {
            max-width: 780px;
            margin: 0 auto;
        }

        .faq-item {
            background: var(--glass-bg);
            backdrop-filter: blur(12px);
            border: 1px solid var(--border-glass);
            border-radius: 12px;
            margin-bottom: 12px;
            overflow: hidden;
            transition: all 0.3s ease;
        }

        .faq-item:hover {
            background: rgba(255, 255, 255, 0.07);
        }

        .faq-question {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 16px 20px;
            cursor: pointer;
            font-weight: 500;
            font-size: 16px;
            color: #fff;
            transition: all 0.3s ease;
            user-select: none;
        }

        .faq-question .faq-icon {
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: rgba(0, 212, 255, 0.12);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--cyan);
            font-size: 14px;
            flex-shrink: 0;
        }

        .faq-question .arrow {
            margin-left: auto;
            transition: transform 0.3s ease;
            color: var(--text-muted);
            font-size: 14px;
        }

        .faq-item.active .faq-question .arrow {
            transform: rotate(180deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
            padding: 0 20px 0 62px;
            font-size: 15px;
            color: var(--text-soft);
            line-height: 1.7;
        }

        .faq-item.active .faq-answer {
            max-height: 300px;
            padding: 0 20px 20px 62px;
        }

        /* CTA */
        .cta-section {
            padding: 80px 0;
            background: linear-gradient(135deg, #0b1426 0%, #1a2a4a 100%);
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: url('/assets/images/backpic/back-1.png') center/cover no-repeat;
            opacity: 0.08;
            z-index: 0;
        }

        .cta-content {
            position: relative;
            z-index: 1;
            text-align: center;
            max-width: 700px;
            margin: 0 auto;
        }

        .cta-content .heading-2 {
            margin-bottom: 12px;
        }

        .cta-content p {
            color: var(--text-soft);
            font-size: 17px;
            margin-bottom: 28px;
        }

        .cta-buttons {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }

        /* footer */
        .site-footer {
            background: #03070e;
            padding: 56px 24px 24px;
            border-top: 1px solid rgba(255, 255, 255, 0.04);
        }

        .footer-grid {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: 2fr 1fr 1.5fr;
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-col h4 {
            font-size: 16px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 16px;
        }

        .footer-col p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
        }

        .footer-links {
            list-style: none;
            padding: 0;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .footer-links a {
            font-size: 14px;
            color: var(--text-muted);
            transition: color 0.3s ease;
        }

        .footer-links a:hover {
            color: var(--cyan);
        }

        .social-links {
            display: flex;
            gap: 12px;
            margin-top: 12px;
            flex-wrap: wrap;
        }

        .social-links a {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.05);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-muted);
            font-size: 16px;
            transition: all 0.3s ease;
            border: 1px solid rgba(255, 255, 255, 0.06);
        }

        .social-links a:hover {
            background: rgba(0, 212, 255, 0.15);
            color: var(--cyan);
            border-color: rgba(0, 212, 255, 0.3);
        }

        .footer-bottom {
            max-width: 1200px;
            margin: 0 auto;
            padding-top: 24px;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 13px;
            color: var(--text-muted);
        }

        .footer-bottom a {
            color: var(--text-muted);
            transition: color 0.3s ease;
        }

        .footer-bottom a:hover {
            color: var(--cyan);
        }

        /* mobile header */
        .mobile-header {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: 56px;
            background: rgba(11, 20, 38, 0.95);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(0, 212, 255, 0.08);
            z-index: 999;
            padding: 0 16px;
            align-items: center;
            justify-content: space-between;
        }

        .mobile-header .brand {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .mobile-header .logo-icon {
            width: 32px;
            height: 32px;
            background: linear-gradient(135deg, var(--cyan), var(--violet));
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 16px;
            color: #fff;
        }

        .mobile-header .brand span {
            font-weight: 600;
            font-size: 15px;
            color: #fff;
        }

        .menu-toggle {
            background: none;
            border: none;
            color: #fff;
            font-size: 22px;
            padding: 6px 10px;
            cursor: pointer;
            border-radius: 6px;
            transition: background 0.3s ease;
        }

        .menu-toggle:hover {
            background: rgba(255, 255, 255, 0.06);
        }

        .mobile-menu {
            display: none;
            position: fixed;
            top: 56px;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(6, 10, 20, 0.98);
            backdrop-filter: blur(20px);
            z-index: 998;
            padding: 24px 16px;
            overflow-y: auto;
        }

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

        .mobile-menu .nav-item {
            padding: 14px 16px;
            font-size: 16px;
            border-radius: 10px;
            color: var(--text-soft);
        }

        .mobile-menu .nav-item.active {
            background: rgba(0, 212, 255, 0.1);
            color: var(--cyan);
        }

        .mobile-menu .nav-item i {
            width: 24px;
        }

        /* responsive */
        @media (max-width: 768px) {
            .side-nav {
                display: none;
            }

            .mobile-header {
                display: flex;
            }

            .main-content {
                margin-left: 0;
                margin-top: 56px;
            }

            .container {
                padding: 0 16px;
            }

            .section {
                padding: 48px 0;
            }

            .hero-section {
                padding: 60px 0 48px;
                min-height: auto;
            }

            .hero-content .heading-1 {
                font-size: 28px;
            }

            .hero-content .hero-sub {
                font-size: 16px;
            }

            .heading-1 {
                font-size: 28px;
            }

            .heading-2 {
                font-size: 22px;
            }

            .heading-3 {
                font-size: 18px;
            }

            .step-flow {
                flex-direction: column;
                align-items: center;
                gap: 32px;
            }

            .step-item {
                max-width: 100%;
                width: 100%;
            }

            .step-item::after {
                display: none;
            }

            .step-item .step-number {
                margin-bottom: 12px;
            }

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

            .faq-question {
                font-size: 15px;
                padding: 14px 16px;
            }

            .faq-answer {
                padding: 0 16px 0 52px;
                font-size: 14px;
            }

            .faq-item.active .faq-answer {
                padding: 0 16px 16px 52px;
            }

            .cta-section {
                padding: 48px 0;
            }

            .cta-buttons {
                flex-direction: column;
                align-items: center;
            }

            .cta-buttons .btn-primary,
            .cta-buttons .btn-outline {
                width: 100%;
                justify-content: center;
                text-align: center;
            }

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

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

            .btn-primary,
            .btn-outline {
                padding: 12px 28px;
                font-size: 14px;
            }
        }

        @media (max-width: 520px) {
            .hero-content .heading-1 {
                font-size: 24px;
            }

            .hero-content .hero-sub {
                font-size: 14px;
            }

            .heading-2 {
                font-size: 20px;
            }

            .scene-card {
                padding: 24px 16px;
            }

            .faq-question .faq-icon {
                width: 24px;
                height: 24px;
                font-size: 12px;
            }
        }

        @media (min-width: 769px) and (max-width: 1024px) {
            .step-flow {
                gap: 24px;
            }

            .step-item {
                min-width: 160px;
            }

            .step-item::after {
                right: -20px;
                font-size: 18px;
            }

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

        /* animations */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(24px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .animate-in {
            animation: fadeInUp 0.6s ease forwards;
        }

        .delay-1 {
            animation-delay: 0.1s;
        }
        .delay-2 {
            animation-delay: 0.2s;
        }
        .delay-3 {
            animation-delay: 0.3s;
        }
        .delay-4 {
            animation-delay: 0.4s;
        }

/* roulang page: category3 */
:root {
            --cyan: #00d4ff;
            --violet: #8b5cf6;
            --navy: #0b1426;
            --navy-light: #1a2a4a;
            --navy-dark: #060a14;
            --glass: rgba(255, 255, 255, 0.05);
            --glass-border: rgba(255, 255, 255, 0.1);
            --text-soft: #b0c4de;
            --text-muted: #6b7280;
            --radius-card: 16px;
            --radius-btn: 8px;
            --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
        }
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
            background: var(--navy-dark);
            color: #e2e8f0;
            line-height: 1.6;
            min-height: 100vh;
            overflow-x: hidden;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: color 0.25s ease;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input {
            font-family: inherit;
            font-size: inherit;
            outline: none;
            border: none;
        }
        /* layout */
        .app-layout {
            display: flex;
            min-height: 100vh;
        }
        .side-nav {
            width: 72px;
            flex-shrink: 0;
            background: rgba(11, 20, 38, 0.92);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-right: 1px solid rgba(0, 212, 255, 0.1);
            display: flex;
            flex-direction: column;
            align-items: center;
            padding: 16px 0 20px;
            position: sticky;
            top: 0;
            height: 100vh;
            z-index: 100;
            transition: width 0.3s ease;
        }
        .side-nav .brand {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 4px;
            margin-bottom: 28px;
            cursor: default;
        }
        .side-nav .logo-icon {
            width: 36px;
            height: 36px;
            border-radius: 10px;
            background: linear-gradient(135deg, var(--cyan), var(--violet));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            font-weight: 700;
            color: #fff;
            box-shadow: 0 0 16px rgba(0, 212, 255, 0.3);
        }
        .side-nav .logo-text {
            font-size: 12px;
            font-weight: 600;
            color: #fff;
            letter-spacing: 1px;
            text-align: center;
            line-height: 1.2;
        }
        .nav-items {
            display: flex;
            flex-direction: column;
            gap: 6px;
            flex: 1;
            width: 100%;
            padding: 0 8px;
        }
        .nav-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 2px;
            padding: 10px 4px 6px;
            border-radius: 8px;
            color: var(--text-muted);
            transition: all 0.25s ease;
            position: relative;
            font-size: 10px;
            text-align: center;
            line-height: 1.2;
        }
        .nav-item i {
            font-size: 18px;
            margin-bottom: 2px;
        }
        .nav-item span {
            font-size: 10px;
            white-space: nowrap;
        }
        .nav-item:hover {
            color: #fff;
            background: rgba(255, 255, 255, 0.06);
        }
        .nav-item.active {
            color: var(--cyan);
        }
        .nav-item.active::before {
            content: '';
            position: absolute;
            left: -8px;
            top: 50%;
            transform: translateY(-50%);
            width: 3px;
            height: 28px;
            background: var(--cyan);
            border-radius: 0 4px 4px 0;
            box-shadow: 0 0 12px rgba(0, 212, 255, 0.6);
        }
        .nav-footer {
            padding-top: 12px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            width: 100%;
            display: flex;
            justify-content: center;
        }
        .nav-footer a {
            color: var(--text-muted);
            font-size: 16px;
            padding: 6px 8px;
            border-radius: 6px;
            transition: color 0.25s ease;
        }
        .nav-footer a:hover {
            color: var(--cyan);
        }
        /* main content */
        .main-content {
            flex: 1;
            min-width: 0;
            display: flex;
            flex-direction: column;
        }
        .container-page {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 32px;
            width: 100%;
        }
        /* hero */
        .faq-hero {
            position: relative;
            padding: 80px 0 72px;
            background: linear-gradient(145deg, #0b1426 0%, #111d3a 50%, #0f1a30 100%);
            overflow: hidden;
        }
        .faq-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
            opacity: 0.12;
            mix-blend-mode: overlay;
        }
        .faq-hero::after {
            content: '';
            position: absolute;
            top: -40%;
            right: -10%;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(0, 212, 255, 0.08) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .faq-hero .hero-content {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .faq-hero h1 {
            font-size: 44px;
            font-weight: 700;
            color: #fff;
            text-shadow: 0 0 30px rgba(0, 212, 255, 0.3);
            margin-bottom: 16px;
        }
        .faq-hero h1 i {
            color: var(--cyan);
            margin-right: 10px;
        }
        .faq-hero .hero-sub {
            font-size: 18px;
            color: var(--text-soft);
            max-width: 640px;
            margin: 0 auto 24px;
            line-height: 1.7;
        }
        .hero-stats {
            display: flex;
            justify-content: center;
            gap: 48px;
            flex-wrap: wrap;
            margin-top: 32px;
        }
        .hero-stat {
            text-align: center;
        }
        .hero-stat .num {
            font-size: 28px;
            font-weight: 700;
            color: var(--cyan);
            font-family: "Inter", monospace;
        }
        .hero-stat .label {
            font-size: 13px;
            color: var(--text-muted);
            margin-top: 2px;
        }
        /* sections */
        .section-block {
            padding: 72px 0;
        }
        .section-block.alt-bg {
            background: rgba(11, 20, 38, 0.5);
        }
        .section-title {
            font-size: 30px;
            font-weight: 700;
            color: #fff;
            text-align: center;
            margin-bottom: 12px;
        }
        .section-sub {
            text-align: center;
            color: var(--text-soft);
            font-size: 16px;
            max-width: 600px;
            margin: 0 auto 48px;
            line-height: 1.7;
        }
        /* category cards */
        .faq-cat-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .faq-cat-card {
            background: var(--glass);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-card);
            padding: 28px 20px 24px;
            text-align: center;
            transition: all 0.3s ease;
            cursor: default;
        }
        .faq-cat-card:hover {
            background: rgba(255, 255, 255, 0.08);
            transform: translateY(-4px);
            box-shadow: var(--shadow-card);
            border-color: rgba(0, 212, 255, 0.2);
        }
        .faq-cat-card .icon {
            width: 52px;
            height: 52px;
            border-radius: 14px;
            background: linear-gradient(135deg, rgba(0, 212, 255, 0.15), rgba(139, 92, 246, 0.15));
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px;
            font-size: 24px;
            color: var(--cyan);
        }
        .faq-cat-card h3 {
            font-size: 18px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 8px;
        }
        .faq-cat-card p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.6;
        }
        .faq-cat-card .count {
            display: inline-block;
            margin-top: 12px;
            font-size: 12px;
            color: var(--cyan);
            background: rgba(0, 212, 255, 0.12);
            padding: 2px 14px;
            border-radius: 20px;
        }
        /* accordion */
        .accordion-group {
            max-width: 820px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .accordion-item {
            background: var(--glass);
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
            border: 1px solid var(--glass-border);
            border-radius: 12px;
            overflow: hidden;
            transition: border-color 0.3s ease;
        }
        .accordion-item:hover {
            border-color: rgba(0, 212, 255, 0.15);
        }
        .accordion-item.active {
            border-color: rgba(0, 212, 255, 0.25);
        }
        .accordion-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 16px 20px;
            cursor: pointer;
            user-select: none;
            transition: background 0.25s ease;
            gap: 12px;
        }
        .accordion-header:hover {
            background: rgba(255, 255, 255, 0.03);
        }
        .accordion-header .q-icon {
            color: var(--cyan);
            font-size: 16px;
            flex-shrink: 0;
        }
        .accordion-header .q-title {
            flex: 1;
            font-size: 16px;
            font-weight: 500;
            color: #f1f5f9;
        }
        .accordion-header .arrow {
            flex-shrink: 0;
            color: var(--text-muted);
            font-size: 14px;
            transition: transform 0.3s ease;
        }
        .accordion-item.active .accordion-header .arrow {
            transform: rotate(180deg);
            color: var(--cyan);
        }
        .accordion-body {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 20px;
        }
        .accordion-item.active .accordion-body {
            max-height: 400px;
            padding: 0 20px 20px;
        }
        .accordion-body p {
            font-size: 15px;
            color: #cbd5e1;
            line-height: 1.8;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding-top: 14px;
        }
        /* flow steps */
        .flow-steps {
            display: flex;
            justify-content: center;
            gap: 24px;
            flex-wrap: wrap;
            max-width: 900px;
            margin: 0 auto;
        }
        .flow-step {
            flex: 1;
            min-width: 200px;
            max-width: 260px;
            text-align: center;
            position: relative;
            padding: 32px 20px 24px;
            background: var(--glass);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-card);
            transition: all 0.3s ease;
        }
        .flow-step:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-card);
            border-color: rgba(0, 212, 255, 0.2);
        }
        .flow-step .step-num {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--cyan), var(--violet));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            font-weight: 700;
            color: #fff;
            margin: 0 auto 16px;
            box-shadow: 0 0 20px rgba(0, 212, 255, 0.25);
        }
        .flow-step h4 {
            font-size: 17px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 8px;
        }
        .flow-step p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.6;
        }
        .flow-arrow {
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            color: var(--cyan);
            opacity: 0.5;
            flex-shrink: 0;
            padding: 0 4px;
        }
        /* cta */
        .cta-section {
            background: linear-gradient(145deg, #0b1426, #111d3a);
            position: relative;
            overflow: hidden;
            padding: 72px 0;
            text-align: center;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-3.webp') center/cover no-repeat;
            opacity: 0.06;
            mix-blend-mode: overlay;
        }
        .cta-section .cta-content {
            position: relative;
            z-index: 2;
        }
        .cta-section h2 {
            font-size: 34px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
        }
        .cta-section p {
            font-size: 17px;
            color: var(--text-soft);
            max-width: 520px;
            margin: 0 auto 32px;
        }
        .btn-group {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }
        .btn-primary {
            display: inline-block;
            padding: 14px 40px;
            border-radius: var(--radius-btn);
            background: linear-gradient(135deg, var(--cyan), var(--violet));
            color: #fff;
            font-size: 15px;
            font-weight: 600;
            border: none;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 0 20px rgba(0, 212, 255, 0.25);
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 0 40px rgba(0, 212, 255, 0.5);
        }
        .btn-primary:active {
            transform: scale(0.97);
        }
        .btn-outline {
            display: inline-block;
            padding: 14px 40px;
            border-radius: var(--radius-btn);
            background: transparent;
            color: var(--cyan);
            font-size: 15px;
            font-weight: 600;
            border: 1.5px solid var(--cyan);
            cursor: pointer;
            transition: all 0.3s ease;
        }
        .btn-outline:hover {
            background: rgba(0, 212, 255, 0.1);
            box-shadow: 0 0 24px rgba(0, 212, 255, 0.2);
            transform: translateY(-2px);
        }
        .btn-outline:active {
            transform: scale(0.97);
        }
        /* footer */
        .site-footer {
            background: #03070e;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            padding: 52px 0 32px;
            margin-top: auto;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1.5fr;
            gap: 40px;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 32px;
        }
        .footer-col h4 {
            font-size: 16px;
            font-weight: 600;
            color: #e2e8f0;
            margin-bottom: 16px;
        }
        .footer-col p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
        }
        .footer-links {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .footer-links a {
            font-size: 14px;
            color: var(--text-muted);
            transition: color 0.25s ease;
        }
        .footer-links a:hover {
            color: var(--cyan);
        }
        .social-links {
            display: flex;
            gap: 12px;
            margin-top: 12px;
            flex-wrap: wrap;
        }
        .social-links a {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            border-radius: 10px;
            background: rgba(255, 255, 255, 0.04);
            color: var(--text-muted);
            font-size: 18px;
            transition: all 0.3s ease;
            border: 1px solid rgba(255, 255, 255, 0.06);
        }
        .social-links a:hover {
            background: rgba(0, 212, 255, 0.12);
            color: var(--cyan);
            border-color: rgba(0, 212, 255, 0.2);
            transform: translateY(-2px);
        }
        .footer-bottom {
            max-width: 1200px;
            margin: 32px auto 0;
            padding: 20px 32px 0;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 13px;
            color: var(--text-muted);
        }
        .footer-bottom a {
            color: var(--text-muted);
            transition: color 0.25s ease;
        }
        .footer-bottom a:hover {
            color: var(--cyan);
        }
        /* mobile nav */
        .mobile-header {
            display: none;
            position: sticky;
            top: 0;
            z-index: 200;
            background: rgba(11, 20, 38, 0.95);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(0, 212, 255, 0.08);
            padding: 0 16px;
            height: 56px;
            align-items: center;
            justify-content: space-between;
        }
        .mobile-header .brand-row {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .mobile-header .logo-icon-sm {
            width: 30px;
            height: 30px;
            border-radius: 8px;
            background: linear-gradient(135deg, var(--cyan), var(--violet));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 14px;
            font-weight: 700;
            color: #fff;
        }
        .mobile-header .brand-text {
            font-size: 14px;
            font-weight: 600;
            color: #fff;
        }
        .mobile-header .hamburger {
            background: none;
            border: none;
            color: #fff;
            font-size: 22px;
            cursor: pointer;
            padding: 6px 8px;
            border-radius: 6px;
            transition: background 0.2s ease;
        }
        .mobile-header .hamburger:hover {
            background: rgba(255, 255, 255, 0.06);
        }
        .mobile-menu {
            display: none;
            position: fixed;
            top: 56px;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(6, 10, 20, 0.98);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            z-index: 199;
            padding: 24px 20px;
            flex-direction: column;
            gap: 6px;
            overflow-y: auto;
        }
        .mobile-menu.open {
            display: flex;
        }
        .mobile-menu a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 14px 16px;
            border-radius: 12px;
            font-size: 16px;
            color: var(--text-muted);
            transition: all 0.25s ease;
        }
        .mobile-menu a i {
            width: 22px;
            font-size: 18px;
        }
        .mobile-menu a:hover,
        .mobile-menu a.active {
            background: rgba(255, 255, 255, 0.06);
            color: var(--cyan);
        }
        /* responsive */
        @media (max-width: 1024px) {
            .faq-cat-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .container-page {
                padding: 0 24px;
            }
        }
        @media (max-width: 768px) {
            .side-nav {
                display: none;
            }
            .mobile-header {
                display: flex;
            }
            .app-layout {
                flex-direction: column;
            }
            .faq-hero {
                padding: 48px 0 52px;
            }
            .faq-hero h1 {
                font-size: 28px;
            }
            .faq-hero .hero-sub {
                font-size: 15px;
            }
            .hero-stats {
                gap: 24px;
            }
            .hero-stat .num {
                font-size: 22px;
            }
            .container-page {
                padding: 0 16px;
            }
            .section-block {
                padding: 48px 0;
            }
            .section-title {
                font-size: 24px;
            }
            .section-sub {
                font-size: 14px;
                margin-bottom: 32px;
            }
            .faq-cat-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .faq-cat-card {
                padding: 20px 14px;
            }
            .faq-cat-card .icon {
                width: 40px;
                height: 40px;
                font-size: 18px;
            }
            .faq-cat-card h3 {
                font-size: 15px;
            }
            .flow-steps {
                flex-direction: column;
                align-items: center;
            }
            .flow-step {
                max-width: 100%;
                min-width: 0;
                width: 100%;
            }
            .flow-arrow {
                transform: rotate(90deg);
                padding: 4px 0;
            }
            .accordion-header .q-title {
                font-size: 14px;
            }
            .accordion-body p {
                font-size: 14px;
            }
            .cta-section {
                padding: 48px 0;
            }
            .cta-section h2 {
                font-size: 26px;
            }
            .btn-group {
                flex-direction: column;
                align-items: center;
            }
            .btn-primary,
            .btn-outline {
                width: 100%;
                max-width: 280px;
                text-align: center;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
                padding: 0 16px;
            }
            .footer-bottom {
                flex-direction: column;
                align-items: center;
                text-align: center;
                padding: 16px 16px 0;
            }
        }
        @media (max-width: 480px) {
            .faq-cat-grid {
                grid-template-columns: 1fr;
            }
            .faq-hero h1 {
                font-size: 24px;
            }
            .hero-stats {
                flex-direction: column;
                gap: 16px;
                align-items: center;
            }
        }
        /* utility */
        .text-cyan {
            color: var(--cyan);
        }
        .text-violet {
            color: var(--violet);
        }
        .glow-text {
            text-shadow: 0 0 20px rgba(0, 212, 255, 0.3);
        }
        .mt-8 {
            margin-top: 32px;
        }
        .mb-8 {
            margin-bottom: 32px;
        }