/* roulang page: index */
:root {
            --deep-space: #0B0E2F;
            --purple-dark: #2D1B4E;
            --purple-mid: #5E2B6E;
            --neon-cyan: #00F0C8;
            --warm-gold: #E6B422;
            --bg-dark: #0A0C1A;
            --bg-card-dark: rgba(255, 255, 255, 0.04);
            --border-dark: rgba(255, 255, 255, 0.08);
            --text-light: #E0E0F0;
            --text-dark: #1E1B33;
            --text-muted: #A0A0C0;
            --white: #FFFFFF;
            --shadow-dark: 0 8px 32px rgba(0, 0, 0, 0.4);
            --shadow-light: 0 12px 40px rgba(69, 26, 101, 0.08);
            --radius-card: 20px;
            --radius-btn: 40px;
            --radius-input: 12px;
            --font-title: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            --font-body: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            --max-width: 1200px;
            --section-gap: 120px;
            --mobile-gap: 80px;
            --transition: 0.3s ease;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-body);
            background-color: var(--bg-dark);
            color: var(--text-light);
            line-height: 1.7;
            font-weight: 400;
            -webkit-font-smoothing: antialiased;
        }

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

        a {
            text-decoration: none;
            color: inherit;
        }

        button,
        input {
            font-family: inherit;
        }

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

        /* Navigation */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            transition: background var(--transition), backdrop-filter var(--transition);
            padding: 16px 0;
        }

        .header.scrolled {
            background: rgba(10, 12, 26, 0.85);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }

        .nav-container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        .logo {
            font-family: var(--font-title);
            font-weight: 700;
            font-size: 1.8rem;
            background: linear-gradient(135deg, #C084FC, #00F0C8);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            display: flex;
            align-items: center;
            gap: 8px;
            letter-spacing: -0.5px;
        }

        .logo i {
            font-size: 2rem;
            background: none;
            -webkit-text-fill-color: var(--neon-cyan);
        }

        .nav-links {
            display: flex;
            list-style: none;
            gap: 32px;
            align-items: center;
        }

        .nav-links a {
            color: #FFFFFF;
            font-weight: 500;
            font-size: 1rem;
            transition: color var(--transition);
            position: relative;
            padding: 4px 0;
        }

        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--neon-cyan);
            transition: width var(--transition);
        }

        .nav-links a:hover,
        .nav-links a.active {
            color: var(--neon-cyan);
        }

        .nav-links a:hover::after {
            width: 100%;
        }

        .hamburger {
            display: none;
            flex-direction: column;
            cursor: pointer;
            gap: 5px;
            background: none;
            border: none;
        }

        .hamburger span {
            width: 25px;
            height: 2px;
            background: #fff;
            transition: all var(--transition);
            border-radius: 2px;
        }

        .mobile-menu {
            position: fixed;
            top: 0;
            right: -100%;
            width: 70%;
            max-width: 320px;
            height: 100vh;
            background: rgba(10, 12, 26, 0.95);
            backdrop-filter: blur(20px);
            padding: 80px 32px;
            transition: right 0.4s ease;
            z-index: 999;
            display: flex;
            flex-direction: column;
            gap: 24px;
        }

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

        .mobile-menu a {
            color: #fff;
            font-size: 1.2rem;
            font-weight: 500;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
            padding-bottom: 12px;
        }

        .mobile-menu a:hover {
            color: var(--neon-cyan);
        }

        .overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.6);
            z-index: 998;
            display: none;
        }

        .overlay.active {
            display: block;
        }

        /* Hero Section */
        .hero {
            min-height: 100vh;
            display: flex;
            align-items: center;
            background: linear-gradient(135deg, #0B0E2F 0%, #2D1B4E 50%, #5E2B6E 100%);
            position: relative;
            overflow: hidden;
            padding-top: 80px;
        }

        .stars {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: radial-gradient(1px 1px at 10% 20%, rgba(255, 255, 255, 0.4), transparent),
                radial-gradient(1px 1px at 30% 70%, rgba(255, 255, 255, 0.3), transparent),
                radial-gradient(1.5px 1.5px at 80% 40%, rgba(255, 255, 255, 0.5), transparent),
                radial-gradient(2px 2px at 50% 90%, rgba(255, 255, 255, 0.2), transparent),
                radial-gradient(1px 1px at 20% 10%, rgba(255, 255, 255, 0.3), transparent);
            animation: twinkle 4s infinite alternate;
        }

        @keyframes twinkle {
            0% {
                opacity: 0.7;
            }
            100% {
                opacity: 1;
            }
        }

        .hero-glow {
            position: absolute;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(0, 240, 200, 0.15) 0%, transparent 70%);
            top: -100px;
            right: -200px;
            border-radius: 50%;
            filter: blur(40px);
        }

        .hero-container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
            position: relative;
            z-index: 2;
            width: 100%;
        }

        .hero-content {
            flex: 1;
            max-width: 600px;
        }

        .hero h1 {
            font-family: var(--font-title);
            font-weight: 700;
            font-size: 48px;
            line-height: 1.2;
            background: linear-gradient(to right, #E0E0F0, #00F0C8);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin-bottom: 24px;
        }

        .hero-subtitle {
            font-size: 1.2rem;
            color: #B0B0D0;
            margin-bottom: 40px;
            max-width: 500px;
        }

        .hero-buttons {
            display: flex;
            gap: 20px;
            flex-wrap: wrap;
        }

        .btn-primary {
            display: inline-block;
            background: linear-gradient(135deg, #00F0C8, #00C8A0);
            color: #0B0E2F;
            font-weight: 700;
            padding: 16px 40px;
            border-radius: var(--radius-btn);
            font-size: 1rem;
            transition: all var(--transition);
            border: none;
            cursor: pointer;
            box-shadow: 0 8px 20px rgba(0, 240, 200, 0.3);
        }

        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 28px rgba(0, 240, 200, 0.5);
            background: linear-gradient(135deg, #00FFD4, #00F0C8);
        }

        .btn-outline {
            display: inline-block;
            background: transparent;
            border: 2px solid rgba(255, 255, 255, 0.5);
            color: #fff;
            font-weight: 600;
            padding: 14px 38px;
            border-radius: var(--radius-btn);
            font-size: 1rem;
            transition: all var(--transition);
            cursor: pointer;
        }

        .btn-outline:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: #fff;
            transform: translateY(-3px);
        }

        .hero-image {
            flex: 1;
            display: flex;
            justify-content: flex-end;
            align-items: center;
        }

        .hero-image img {
            max-width: 320px;
            animation: float 6s ease-in-out infinite;
            filter: drop-shadow(0 20px 30px rgba(0, 0, 0, 0.5));
        }

        @keyframes float {
            0% {
                transform: translateY(0px);
            }
            50% {
                transform: translateY(-12px);
            }
            100% {
                transform: translateY(0px);
            }
        }

        /* Sections General */
        section {
            padding: var(--section-gap) 0;
        }

        .section-light {
            background: #F7F5FF;
            color: var(--text-dark);
        }

        .section-dark {
            background: var(--bg-dark);
            color: var(--text-light);
        }

        .section-title {
            font-family: var(--font-title);
            font-weight: 700;
            font-size: 36px;
            line-height: 1.2;
            margin-bottom: 16px;
        }

        .section-subtitle {
            font-size: 1.1rem;
            color: var(--text-muted);
            margin-bottom: 48px;
        }

        .section-light .section-title {
            color: #1E1B33;
        }

        .section-light .section-subtitle {
            color: #6B6B8A;
        }

        /* Services Grid 2x2 asimmetric */
        .services-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 32px;
        }

        .service-card {
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: var(--radius-card);
            padding: 32px;
            display: flex;
            gap: 24px;
            align-items: flex-start;
            transition: all var(--transition);
            backdrop-filter: blur(4px);
        }

        .service-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-dark);
            border-color: rgba(0, 240, 200, 0.3);
        }

        .service-icon {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            background: linear-gradient(135deg, rgba(0, 240, 200, 0.2), transparent);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.8rem;
            color: var(--neon-cyan);
            flex-shrink: 0;
        }

        .service-text h3 {
            font-weight: 700;
            font-size: 1.3rem;
            margin-bottom: 8px;
        }

        .service-text p {
            color: #B0B0D0;
            font-size: 0.95rem;
        }

        /* Stats */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .stat-card {
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: var(--radius-card);
            padding: 32px 24px;
            text-align: center;
            position: relative;
            transition: all var(--transition);
        }

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

        .stat-number {
            font-size: 48px;
            font-weight: 700;
            background: linear-gradient(135deg, #00F0C8, #E6B422);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin-bottom: 12px;
        }

        .stat-label {
            color: #B0B0D0;
            font-size: 0.95rem;
        }

        .stat-badge {
            position: absolute;
            top: -8px;
            right: -8px;
            width: 32px;
            height: 32px;
            background: var(--warm-gold);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 0 12px rgba(230, 180, 34, 0.5);
        }

        /* Cases logo wall */
        .logo-scroll {
            display: flex;
            gap: 40px;
            overflow-x: auto;
            padding: 20px 0;
            scrollbar-width: thin;
            scrollbar-color: #2D1B4E transparent;
        }

        .logo-scroll::-webkit-scrollbar {
            height: 6px;
        }
        .logo-scroll::-webkit-scrollbar-thumb {
            background: #2D1B4E;
            border-radius: 10px;
        }

        .logo-item {
            flex: 0 0 auto;
            width: 120px;
            height: 60px;
            background: rgba(255, 255, 255, 0.08);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            filter: grayscale(100%);
            transition: all var(--transition);
            cursor: pointer;
            font-size: 0.9rem;
            color: #888;
            font-weight: 700;
        }

        .logo-item:hover {
            filter: grayscale(0%);
            background: rgba(255, 255, 255, 0.15);
            color: var(--neon-cyan);
            box-shadow: 0 0 20px rgba(0, 240, 200, 0.2);
        }

        /* Solutions Steps */
        .solutions-cards {
            display: flex;
            gap: 32px;
            align-items: flex-end;
            justify-content: center;
            flex-wrap: wrap;
        }

        .solution-card {
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: var(--radius-card);
            padding: 40px 32px;
            flex: 1;
            min-width: 250px;
            position: relative;
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
        }

        .solution-card.featured {
            background: linear-gradient(135deg, rgba(94, 43, 110, 0.6), rgba(45, 27, 78, 0.8));
            border-color: var(--neon-cyan);
            transform: translateY(-20px);
            box-shadow: 0 20px 40px rgba(0, 240, 200, 0.15);
        }

        .solution-card h3 {
            font-size: 1.4rem;
            margin-bottom: 16px;
        }

        .solution-card ul {
            list-style: none;
            margin-bottom: 24px;
            flex: 1;
        }

        .solution-card li {
            margin-bottom: 8px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .solution-card li i {
            color: var(--neon-cyan);
        }

        .badge-recommend {
            position: absolute;
            top: -12px;
            right: 20px;
            background: var(--warm-gold);
            color: #0B0E2F;
            font-weight: 700;
            padding: 6px 16px;
            border-radius: 20px;
            font-size: 0.8rem;
        }

        .btn-small {
            display: inline-block;
            background: transparent;
            border: 1px solid var(--neon-cyan);
            color: var(--neon-cyan);
            padding: 12px 28px;
            border-radius: 30px;
            font-weight: 600;
            transition: all var(--transition);
            text-align: center;
            cursor: pointer;
        }

        .btn-small:hover {
            background: var(--neon-cyan);
            color: #0B0E2F;
        }

        .featured .btn-small {
            background: var(--neon-cyan);
            color: #0B0E2F;
            border: none;
        }

        /* FAQ */
        .faq-wrapper {
            display: grid;
            grid-template-columns: 1fr 1.5fr;
            gap: 60px;
            align-items: start;
        }

        .faq-left h2 {
            color: #fff;
            margin-bottom: 16px;
        }

        .faq-left p {
            color: #B0B0D0;
        }

        .accordion-item {
            background: rgba(255, 255, 255, 0.03);
            border-radius: 12px;
            margin-bottom: 12px;
            border-left: 4px solid transparent;
            transition: all var(--transition);
            cursor: pointer;
            padding: 20px 24px;
        }

        .accordion-item.active {
            border-left-color: var(--neon-cyan);
            background: rgba(0, 240, 200, 0.05);
        }

        .accordion-question {
            font-weight: 700;
            font-size: 1.1rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .accordion-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease;
            color: #B0B0D0;
            font-size: 0.95rem;
            margin-top: 0;
        }

        .accordion-item.active .accordion-answer {
            max-height: 200px;
            margin-top: 12px;
        }

        /* CTA */
        .cta-section {
            background: linear-gradient(135deg, #1A1035 0%, #2D1B4E 100%);
            text-align: center;
            padding: 100px 0;
        }

        .cta-title {
            font-size: 2.5rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 16px;
        }

        .cta-sub {
            color: #B0B0D0;
            margin-bottom: 40px;
        }

        .subscribe-form {
            display: flex;
            max-width: 480px;
            margin: 40px auto 0;
            background: rgba(255, 255, 255, 0.08);
            border-radius: var(--radius-input);
            overflow: hidden;
            border: 1px solid rgba(255, 255, 255, 0.1);
        }

        .subscribe-form input {
            flex: 1;
            background: transparent;
            border: none;
            padding: 16px 20px;
            color: #fff;
            font-size: 1rem;
            outline: none;
        }

        .subscribe-form button {
            background: linear-gradient(135deg, #00F0C8, #00C8A0);
            border: none;
            padding: 0 32px;
            font-weight: 700;
            color: #0B0E2F;
            cursor: pointer;
            transition: all var(--transition);
        }

        .subscribe-form button:hover {
            background: #00FFD4;
        }

        .qr-placeholder {
            width: 120px;
            height: 120px;
            background: rgba(255, 255, 255, 0.1);
            margin: 32px auto 0;
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #888;
            font-size: 0.8rem;
            background-image: url('/assets/images/coverpic/cover-4.webp');
            background-size: cover;
            background-position: center;
        }

        /* Footer */
        .footer {
            background: #06081A;
            padding: 60px 0 24px;
            color: #B0B0D0;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-col h4 {
            color: var(--neon-cyan);
            margin-bottom: 16px;
            font-weight: 700;
        }

        .footer-col ul {
            list-style: none;
        }

        .footer-col li {
            margin-bottom: 8px;
        }

        .footer-col a {
            color: #B0B0D0;
            transition: color var(--transition);
        }

        .footer-col a:hover {
            color: #fff;
            text-decoration: underline;
        }

        .copyright {
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            padding-top: 24px;
            text-align: center;
            font-size: 0.9rem;
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .hero h1 {
                font-size: 36px;
            }
            .section-title {
                font-size: 28px;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .faq-wrapper {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 768px) {
            .nav-links {
                display: none;
            }
            .hamburger {
                display: flex;
            }
            .hero-container {
                flex-direction: column;
                text-align: center;
                padding-top: 40px;
            }
            .hero-content {
                max-width: 100%;
            }
            .hero-image {
                justify-content: center;
                margin-top: 40px;
            }
            .hero-image img {
                max-width: 240px;
            }
            .services-grid {
                grid-template-columns: 1fr;
            }
            .solutions-cards {
                flex-direction: column;
                align-items: stretch;
            }
            .solution-card.featured {
                transform: none;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .section {
                padding: var(--mobile-gap) 0;
            }
            .hero h1 {
                font-size: 28px;
            }
            .btn-primary,
            .btn-outline {
                width: 100%;
                text-align: center;
            }
            .hero-buttons {
                flex-direction: column;
                gap: 12px;
            }
        }

        @media (max-width: 520px) {
            .stats-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
        }