/* roulang page: index */
:root {
            --primary: #0A0E27;
            --primary-light: #131B33;
            --accent-cyan: #00F0FF;
            --accent-red: #FF4655;
            --bg-light: #F4F6FA;
            --card-white: #FFFFFF;
            --text-dark: #1E2A3A;
            --text-muted: #6B7B8D;
            --text-white: #FFFFFF;
            --border-radius-lg: 16px;
            --border-radius-md: 12px;
            --border-radius-sm: 8px;
            --shadow-card: 0 8px 28px rgba(10, 14, 39, 0.05);
            --shadow-hover: 0 18px 36px rgba(10, 14, 39, 0.1);
            --transition-smooth: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
            --spacing-section: 100px;
            --max-width: 1240px;
        }

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

        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }

        body {
            font-family: var(--font-sans);
            background-color: #fff;
            color: var(--text-dark);
            line-height: 1.5;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }

        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 28px;
        }

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

        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition-smooth);
        }

        /* 导航栏双层结构 */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background-color: var(--primary);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
        }

        .nav-top-row {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 12px 28px;
            background-color: var(--primary);
        }

        .logo-area {
            display: flex;
            align-items: center;
            gap: 8px;
            font-weight: 700;
            font-size: 1.8rem;
            letter-spacing: 1px;
            color: var(--text-white);
        }

        .logo-icon {
            font-size: 2rem;
            color: var(--accent-cyan);
        }

        .nav-actions {
            display: flex;
            align-items: center;
            gap: 16px;
        }

        .btn-text {
            background: transparent;
            border: none;
            color: #D1D5DB;
            font-weight: 500;
            font-size: 0.95rem;
            padding: 6px 10px;
            cursor: pointer;
            transition: var(--transition-smooth);
        }

        .btn-text:hover {
            color: var(--accent-cyan);
        }

        .btn-primary {
            background-color: var(--accent-cyan);
            color: var(--primary);
            border: none;
            padding: 10px 22px;
            border-radius: var(--border-radius-sm);
            font-weight: 600;
            font-size: 0.95rem;
            cursor: pointer;
            transition: var(--transition-smooth);
            box-shadow: 0 0 12px rgba(0, 240, 255, 0.25);
            letter-spacing: 0.3px;
        }

        .btn-primary:hover {
            background-color: #33F5FF;
            box-shadow: 0 0 18px rgba(0, 240, 255, 0.5);
            transform: translateY(-1px);
        }

        .nav-channels-row {
            background-color: var(--primary-light);
            padding: 8px 28px;
            display: flex;
            align-items: center;
            gap: 10px;
            overflow-x: auto;
            white-space: nowrap;
            -webkit-overflow-scrolling: touch;
            scrollbar-width: none;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
        }

        .nav-channels-row::-webkit-scrollbar {
            display: none;
        }

        .pill-tab {
            background: transparent;
            border: 1px solid rgba(255, 255, 255, 0.2);
            color: #A0AEC0;
            padding: 6px 18px;
            border-radius: 40px;
            font-weight: 500;
            font-size: 0.9rem;
            cursor: pointer;
            transition: var(--transition-smooth);
            flex-shrink: 0;
        }

        .pill-tab.active {
            background: var(--accent-cyan);
            color: var(--primary);
            border-color: var(--accent-cyan);
            font-weight: 600;
            box-shadow: 0 0 12px rgba(0, 240, 255, 0.35);
        }

        .pill-tab:hover {
            border-color: var(--accent-cyan);
            color: var(--accent-cyan);
        }

        .search-icon {
            margin-left: auto;
            color: #A0AEC0;
            font-size: 1.2rem;
            cursor: pointer;
            transition: var(--transition-smooth);
            flex-shrink: 0;
        }

        .search-icon:hover {
            color: var(--accent-cyan);
        }

        /* 汉堡菜单移动端 */
        .hamburger {
            display: none;
            background: transparent;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
        }

        @media (max-width: 768px) {
            .nav-top-row {
                padding: 12px 20px;
            }

            .nav-actions {
                gap: 8px;
            }

            .btn-text,
            .btn-primary {
                padding: 6px 14px;
                font-size: 0.85rem;
            }

            .nav-channels-row {
                padding: 8px 16px;
                gap: 8px;
            }

            .pill-tab {
                padding: 5px 14px;
                font-size: 0.8rem;
            }

            .hamburger {
                display: block;
            }
        }

        /* Hero */
        .hero-section {
            background: linear-gradient(0deg, rgba(10, 14, 39, 0.8) 0%, rgba(10, 14, 39, 0.2) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
            min-height: 90vh;
            display: flex;
            align-items: center;
            color: white;
            position: relative;
        }

        .hero-content {
            max-width: 800px;
            margin: 0 auto;
            text-align: center;
            padding: 40px 20px;
        }

        .hero-title {
            font-size: 3.4rem;
            font-weight: 700;
            line-height: 1.2;
            background: linear-gradient(to right, #00F0FF, #A0E9FF);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin-bottom: 24px;
            letter-spacing: -0.5px;
        }

        .hero-sub {
            font-size: 1.2rem;
            color: rgba(255, 255, 255, 0.85);
            margin-bottom: 32px;
        }

        .hero-buttons {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
            margin-bottom: 48px;
        }

        .btn-cta-red {
            background: var(--accent-red);
            color: white;
            border: none;
            padding: 14px 36px;
            border-radius: var(--border-radius-sm);
            font-weight: 600;
            font-size: 1.1rem;
            cursor: pointer;
            transition: var(--transition-smooth);
        }

        .btn-cta-red:hover {
            background: #E63443;
            box-shadow: 0 8px 20px rgba(255, 70, 85, 0.4);
        }

        .btn-outline-cyan {
            background: transparent;
            border: 1.5px solid var(--accent-cyan);
            color: var(--accent-cyan);
            padding: 14px 36px;
            border-radius: var(--border-radius-sm);
            font-weight: 600;
            font-size: 1.1rem;
            cursor: pointer;
        }

        .btn-outline-cyan:hover {
            background: rgba(0, 240, 255, 0.1);
        }

        .partner-strip {
            display: flex;
            justify-content: center;
            gap: 36px;
            flex-wrap: wrap;
            opacity: 0.8;
        }

        .partner-strip img {
            height: 32px;
            filter: grayscale(0.2) brightness(1.2);
        }

        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.4rem;
            }
        }

        /* 通用板块 */
        .section {
            padding: var(--spacing-section) 0;
        }

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

        .section-title {
            font-size: 2.4rem;
            font-weight: 600;
            color: var(--primary);
            margin-bottom: 18px;
            text-align: center;
        }

        .section-desc {
            color: var(--text-muted);
            text-align: center;
            max-width: 600px;
            margin: 0 auto 48px;
            font-size: 1.1rem;
        }

        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        .feature-card {
            background: var(--card-white);
            padding: 36px 24px;
            border-radius: var(--border-radius-md);
            box-shadow: var(--shadow-card);
            transition: var(--transition-smooth);
            text-align: center;
        }

        .feature-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
        }

        .feature-icon {
            font-size: 2.8rem;
            color: var(--accent-cyan);
            margin-bottom: 20px;
        }

        .feature-card h3 {
            font-size: 1.5rem;
            margin-bottom: 12px;
            font-weight: 600;
        }

        .alternating-block {
            display: flex;
            align-items: center;
            gap: 48px;
            margin-bottom: 64px;
        }

        .alternating-block.reverse {
            flex-direction: row-reverse;
        }

        .alt-text {
            flex: 1;
        }

        .alt-image {
            flex: 1;
            border-radius: var(--border-radius-sm);
            overflow: hidden;
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
        }

        .scenario-cards {
            display: flex;
            gap: 24px;
            overflow-x: auto;
            padding-bottom: 12px;
        }

        .scenario-card {
            min-width: 260px;
            background: white;
            border-radius: var(--border-radius-md);
            padding: 24px;
            box-shadow: var(--shadow-card);
        }

        .case-scroll {
            display: flex;
            gap: 24px;
            overflow-x: auto;
            padding-bottom: 8px;
        }

        .case-card {
            background: white;
            border-radius: var(--border-radius-md);
            padding: 20px;
            min-width: 280px;
            display: flex;
            align-items: center;
            gap: 16px;
            box-shadow: var(--shadow-card);
        }

        .faq-item {
            border-bottom: 1px solid #E2E8F0;
            padding: 16px 0;
            cursor: pointer;
        }

        .faq-question {
            font-weight: 600;
            display: flex;
            justify-content: space-between;
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease;
            color: var(--text-muted);
        }

        .faq-answer.open {
            max-height: 200px;
            margin-top: 12px;
        }

        .cta-banner {
            background: var(--accent-red);
            color: white;
            text-align: center;
            padding: 64px 20px;
            border-radius: var(--border-radius-lg);
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.2fr;
            gap: 32px;
            color: #CBD5E0;
        }

        footer {
            background: var(--primary);
            padding: 60px 0 28px;
        }

        @media (max-width: 1024px) {
            .grid-3 {
                grid-template-columns: repeat(2, 1fr);
            }
            .alternating-block {
                flex-direction: column;
            }
            .alternating-block.reverse {
                flex-direction: column;
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 640px) {
            .grid-3 {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .hero-title {
                font-size: 2rem;
            }
        }