/* roulang page: index */
:root {
            --primary-cyan: #00E5FF;
            --secondary-violet: #7C3AED;
            --accent-orange: #FF6B35;
            --bg-deep: #0A0E17;
            --bg-card: #141B26;
            --text-primary: #FFFFFF;
            --text-secondary: rgba(255, 255, 255, 0.7);
            --text-tertiary: rgba(255, 255, 255, 0.45);
            --border-light: rgba(0, 229, 255, 0.15);
            --border-strong: rgba(0, 229, 255, 0.3);
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
            --shadow-hover: 0 16px 48px rgba(0, 229, 255, 0.15);
            --glass-bg: rgba(20, 27, 38, 0.6);
            --glass-border: 1px solid rgba(0, 229, 255, 0.15);
            --glass-blur: blur(20px);
            --transition-smooth: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
        }

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

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

        body {
            font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            background-color: var(--bg-deep);
            color: var(--text-primary);
            line-height: 1.7;
            font-weight: 400;
            font-size: 16px;
            overflow-x: hidden;
            background-image: linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
                linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
            background-size: 40px 40px;
        }

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

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

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

        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 32px;
        }

        /* 导航栏 */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            transition: var(--transition-smooth);
            background: transparent;
            padding: 20px 0;
        }

        .header.scrolled {
            background: rgba(10, 14, 23, 0.85);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-light);
            padding: 12px 0;
        }

        .nav-container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 32px;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: -0.02em;
        }

        .logo-icon {
            width: 36px;
            height: 36px;
            background: linear-gradient(135deg, var(--primary-cyan), var(--secondary-violet));
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            box-shadow: 0 4px 12px rgba(0, 229, 255, 0.3);
        }

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

        .nav-link {
            font-weight: 500;
            color: var(--text-secondary);
            position: relative;
            padding: 6px 0;
            transition: color 0.2s;
        }

        .nav-link:hover,
        .nav-link.active {
            color: var(--primary-cyan);
        }

        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: -4px;
            left: 0;
            width: 100%;
            height: 2px;
            background: var(--primary-cyan);
            box-shadow: 0 0 8px var(--primary-cyan);
            border-radius: 2px;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--primary-cyan), var(--secondary-violet));
            color: #fff;
            padding: 12px 28px;
            border-radius: 50px;
            font-weight: 600;
            letter-spacing: 0.5px;
            box-shadow: 0 4px 16px rgba(0, 229, 255, 0.25);
            transition: var(--transition-smooth);
            display: inline-flex;
            align-items: center;
            gap: 8px;
            cursor: pointer;
            border: none;
            white-space: nowrap;
        }

        .btn-primary:hover {
            box-shadow: 0 0 24px rgba(0, 229, 255, 0.5);
            filter: brightness(1.15);
            transform: translateY(-1px);
        }

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

        .btn-outline {
            background: transparent;
            border: 1px solid var(--primary-cyan);
            color: var(--primary-cyan);
            padding: 12px 28px;
            border-radius: 50px;
            font-weight: 600;
            transition: var(--transition-smooth);
            cursor: pointer;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            white-space: nowrap;
        }

        .btn-outline:hover {
            background: rgba(0, 229, 255, 0.1);
            border-color: #fff;
            color: #fff;
        }

        .btn-accent {
            background: linear-gradient(135deg, var(--primary-cyan), var(--accent-orange));
            color: #fff;
            padding: 14px 32px;
            border-radius: 50px;
            font-weight: 700;
            box-shadow: 0 6px 20px rgba(255, 107, 53, 0.3);
            transition: var(--transition-smooth);
            cursor: pointer;
            border: none;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

        .btn-accent:hover {
            box-shadow: 0 0 28px rgba(255, 107, 53, 0.6);
            filter: brightness(1.1);
            transform: translateY(-2px);
        }

        .hamburger {
            display: none;
            flex-direction: column;
            cursor: pointer;
            gap: 5px;
            z-index: 1001;
        }

        .hamburger span {
            width: 28px;
            height: 2px;
            background: #fff;
            border-radius: 4px;
            transition: var(--transition-smooth);
        }

        .mobile-menu {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(10, 14, 23, 0.97);
            backdrop-filter: blur(24px);
            z-index: 999;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 40px;
        }

        .mobile-menu.active {
            display: flex;
        }

        .mobile-menu a {
            font-size: 1.6rem;
            font-weight: 600;
            color: #fff;
        }

        /* Hero */
        .hero {
            padding: 160px 0 100px;
            position: relative;
            overflow: hidden;
            background: radial-gradient(circle at 30% 50%, rgba(0, 229, 255, 0.08) 0%, transparent 70%),
                radial-gradient(circle at 80% 20%, rgba(124, 58, 237, 0.1) 0%, transparent 60%);
        }

        .hero-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 80px;
            align-items: center;
        }

        .hero-content h1 {
            font-size: clamp(36px, 5vw, 54px);
            font-weight: 700;
            line-height: 1.2;
            letter-spacing: -0.03em;
            margin-bottom: 24px;
            background: linear-gradient(135deg, #FFFFFF 0%, var(--primary-cyan) 70%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero-subtitle {
            font-size: 1.2rem;
            color: var(--text-secondary);
            margin-bottom: 40px;
            max-width: 480px;
        }

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

        .hero-visual {
            position: relative;
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .mockup-wrapper {
            background: var(--glass-bg);
            backdrop-filter: var(--glass-blur);
            -webkit-backdrop-filter: var(--glass-blur);
            border: var(--glass-border);
            border-radius: 24px;
            padding: 20px;
            box-shadow: var(--shadow-card), 0 0 40px rgba(0, 229, 255, 0.2);
            transform: perspective(1000px) rotateY(-5deg) rotateX(3deg);
            transition: transform 0.5s ease;
            animation: float 6s ease-in-out infinite;
        }

        .mockup-wrapper:hover {
            transform: perspective(1000px) rotateY(0deg) rotateX(0deg);
        }

        @keyframes float {
            0%,
            100% {
                transform: translateY(0) perspective(1000px) rotateY(-5deg) rotateX(3deg);
            }
            50% {
                transform: translateY(-15px) perspective(1000px) rotateY(-5deg) rotateX(3deg);
            }
        }

        .mockup-img {
            border-radius: 12px;
            width: 100%;
            max-width: 380px;
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
        }

        /* 板块通用 */
        .section {
            padding: 100px 0;
        }

        .section-title {
            font-size: 2.25rem;
            font-weight: 700;
            text-align: center;
            margin-bottom: 16px;
            letter-spacing: -0.02em;
        }

        .section-subtitle {
            text-align: center;
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto 60px;
            font-size: 1.1rem;
        }

        .glow-underline {
            width: 60px;
            height: 3px;
            background: var(--primary-cyan);
            margin: 12px auto 40px;
            border-radius: 4px;
            box-shadow: 0 0 12px var(--primary-cyan);
        }

        /* 核心亮点 */
        .highlights-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 32px;
            align-items: start;
        }

        .highlight-card {
            background: var(--glass-bg);
            backdrop-filter: var(--glass-blur);
            -webkit-backdrop-filter: var(--glass-blur);
            border: var(--glass-border);
            border-radius: var(--radius-lg);
            padding: 40px 32px;
            transition: var(--transition-smooth);
            position: relative;
            box-shadow: var(--shadow-card);
        }

        .highlight-card.featured {
            grid-row: span 1.3;
            background: rgba(20, 27, 38, 0.8);
            border-color: var(--border-strong);
        }

        .highlight-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
            border-color: var(--primary-cyan);
        }

        .highlight-icon {
            width: 56px;
            height: 56px;
            background: rgba(0, 229, 255, 0.1);
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 24px;
            font-size: 1.8rem;
            color: var(--primary-cyan);
            box-shadow: 0 0 20px rgba(0, 229, 255, 0.25);
        }

        .highlight-card h3 {
            font-size: 1.4rem;
            margin-bottom: 12px;
            font-weight: 600;
        }

        .highlight-card p {
            color: var(--text-secondary);
        }

        /* 案例瀑布流 */
        .showcase-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 40px;
        }

        .showcase-card {
            background: var(--glass-bg);
            backdrop-filter: var(--glass-blur);
            border: var(--glass-border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: var(--transition-smooth);
            box-shadow: var(--shadow-card);
        }

        .showcase-card:nth-child(odd) {
            transform: translateY(0);
        }
        .showcase-card:nth-child(even) {
            transform: translateY(20px);
        }

        .showcase-card:hover {
            transform: translateY(-8px) !important;
            box-shadow: var(--shadow-hover);
        }

        .showcase-img {
            height: 220px;
            background-size: cover;
            background-position: center;
            position: relative;
        }

        .showcase-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(to top, rgba(10, 14, 23, 0.8), transparent);
        }

        .showcase-body {
            padding: 24px;
        }

        .badge {
            display: inline-block;
            background: rgba(124, 58, 237, 0.2);
            color: #C084FC;
            padding: 4px 14px;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 600;
            margin-bottom: 12px;
        }

        .showcase-body h3 {
            font-size: 1.25rem;
            margin-bottom: 8px;
        }

        .showcase-body p {
            color: var(--text-secondary);
            font-size: 0.95rem;
        }

        /* 对比表 */
        .compare-table {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 0;
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--border-light);
        }

        .compare-col {
            padding: 32px 24px;
            border-right: 1px solid var(--border-light);
        }
        .compare-col:last-child {
            border-right: none;
        }

        .compare-col.highlight {
            background: rgba(0, 229, 255, 0.03);
            border-left: 3px solid var(--primary-cyan);
            box-shadow: inset 0 0 30px rgba(0, 229, 255, 0.05);
        }

        .compare-header {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 20px;
            color: var(--primary-cyan);
        }

        .compare-row {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 14px 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
            font-size: 0.95rem;
        }

        .check-icon {
            color: var(--primary-cyan);
            font-weight: bold;
        }

        /* FAQ */
        .faq-container {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .faq-card {
            background: var(--glass-bg);
            backdrop-filter: var(--glass-blur);
            border: var(--glass-border);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: var(--transition-smooth);
            cursor: pointer;
        }

        .faq-question {
            padding: 24px 28px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-weight: 600;
            font-size: 1.1rem;
        }

        .faq-icon {
            font-size: 1.5rem;
            color: var(--primary-cyan);
            transition: transform 0.3s;
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s;
            padding: 0 28px;
            color: var(--text-secondary);
            border-left: 0px solid var(--primary-cyan);
        }

        .faq-card.open .faq-answer {
            max-height: 500px;
            padding: 0 28px 24px;
            border-left: 3px solid var(--primary-cyan);
        }

        .faq-card.open .faq-icon {
            transform: rotate(45deg);
        }

        /* CTA Banner */
        .cta-banner {
            background: linear-gradient(135deg, #0A0E17 0%, #141B26 100%);
            border-radius: var(--radius-lg);
            padding: 80px 40px;
            text-align: center;
            border: 1px solid var(--border-light);
            position: relative;
            overflow: hidden;
        }

        .cta-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(circle at 50% 50%, rgba(0, 229, 255, 0.06) 0%, transparent 70%);
        }

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

        .cta-desc {
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto 32px;
        }

        .cta-buttons {
            display: flex;
            gap: 20px;
            justify-content: center;
            flex-wrap: wrap;
        }

        /* 页脚 */
        .footer {
            background: #060B13;
            padding: 80px 0 30px;
            border-top: 1px solid var(--border-light);
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-col h4 {
            color: #fff;
            margin-bottom: 20px;
            font-weight: 600;
        }

        .footer-col a,
        .footer-col p {
            color: var(--text-tertiary);
            display: block;
            margin-bottom: 10px;
            font-size: 0.95rem;
        }

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

        .copyright {
            text-align: center;
            color: var(--text-tertiary);
            font-size: 0.85rem;
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
        }

        .fixed-cta {
            position: fixed;
            bottom: 24px;
            right: 24px;
            z-index: 900;
            background: var(--accent-orange);
            color: #fff;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 8px 24px rgba(255, 107, 53, 0.4);
            cursor: pointer;
            transition: var(--transition-smooth);
            font-weight: 700;
        }

        .fixed-cta:hover {
            transform: scale(1.08);
            box-shadow: 0 12px 32px rgba(255, 107, 53, 0.6);
        }

        @media (max-width: 1024px) {
            .hero-grid {
                grid-template-columns: 1fr;
                gap: 60px;
            }
            .highlights-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .showcase-grid {
                grid-template-columns: 1fr;
            }
            .showcase-card:nth-child(even) {
                transform: translateY(0);
            }
            .compare-table {
                grid-template-columns: 1fr;
                overflow-x: auto;
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .nav-menu {
                display: none;
            }
            .hamburger {
                display: flex;
            }
            .highlights-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .hero {
                padding: 120px 0 60px;
            }
            .section {
                padding: 70px 0;
            }
        }