/* roulang page: index */
:root {
            --primary: #FF3C00;
            --primary-hover: #E03400;
            --primary-glow: rgba(255, 60, 0, 0.25);
            --accent: #00E5FF;
            --dark: #1A1A2E;
            --darker: #111122;
            --bg-light: #FBFBFD;
            --bg-gray: #F5F5F8;
            --text-main: #1A1A2E;
            --text-secondary: #5A5A72;
            --text-muted: #8888A0;
            --white: #FFFFFF;
            --border-light: rgba(0,0,0,0.04);
            --border-card: rgba(0,0,0,0.06);
            --shadow-sm: 0 4px 20px rgba(26,26,46,0.08);
            --shadow-hover: 0 12px 32px rgba(255,60,0,0.15);
            --radius-lg: 12px;
            --radius-md: 8px;
            --transition: 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
            --font-title: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
            --font-body: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
            --font-mono: 'DIN', 'SF Mono', 'Courier New', monospace;
            --container-max: 1200px;
            --section-gap: 100px;
            --section-gap-mobile: 60px;
        }

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

        body {
            font-family: var(--font-body);
            background: var(--white);
            color: var(--text-main);
            line-height: 1.7;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            scroll-behavior: smooth;
        }

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

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

        button {
            border: none;
            cursor: pointer;
            font-family: var(--font-body);
        }

        /* 容器 */
        .container-custom {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 20px;
            width: 100%;
        }

        /* 顶部信息条 */
        .top-bar-custom {
            background: var(--dark);
            color: #CCCCCC;
            height: 36px;
            font-size: 12px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0 24px;
            position: relative;
            z-index: 1001;
        }
        .top-bar-left {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .top-bar-left span {
            color: #AAA;
        }
        .domain-hint {
            color: #FF3C00;
            font-weight: 600;
            letter-spacing: 0.3px;
        }
        .top-bar-right a {
            color: #CCCCCC;
            display: flex;
            align-items: center;
            gap: 6px;
            transition: color 0.2s;
        }
        .top-bar-right a:hover {
            color: var(--accent);
        }

        /* 主导航 */
        .main-nav {
            background: rgba(255,255,255,0.96);
            backdrop-filter: blur(12px);
            position: sticky;
            top: 0;
            z-index: 1000;
            border-bottom: 1px solid rgba(0,0,0,0.05);
            box-shadow: 0 2px 12px rgba(0,0,0,0.03);
        }
        .nav-container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0 24px;
            height: 68px;
        }
        .logo-area {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 800;
            font-size: 22px;
            color: var(--dark);
            letter-spacing: 0.5px;
        }
        .logo-icon {
            color: var(--primary);
            font-size: 28px;
            filter: drop-shadow(0 2px 6px rgba(255,60,0,0.4));
        }
        .nav-links {
            display: flex;
            gap: 28px;
            list-style: none;
        }
        .nav-links a {
            font-weight: 500;
            font-size: 15px;
            color: var(--text-main);
            position: relative;
            padding: 6px 0;
        }
        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--primary);
            transition: width var(--transition);
        }
        .nav-links a:hover::after,
        .nav-links a.active-link::after {
            width: 100%;
        }
        .nav-cta {
            background: var(--primary);
            color: white;
            padding: 10px 24px;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 14px;
            transition: background var(--transition), transform 0.2s;
            white-space: nowrap;
        }
        .nav-cta:hover {
            background: var(--primary-hover);
            transform: translateY(-2px);
            box-shadow: 0 6px 18px var(--primary-glow);
        }

        .hamburger {
            display: none;
            background: none;
            font-size: 24px;
            color: var(--dark);
        }

        /* Hero */
        .hero-section {
            background: var(--dark);
            position: relative;
            overflow: hidden;
            padding: 80px 0 100px;
            color: white;
        }
        .hero-glow {
            position: absolute;
            right: -10%;
            bottom: -20%;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(0,229,255,0.12) 0%, transparent 70%);
            pointer-events: none;
        }
        .hero-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
            position: relative;
            z-index: 2;
        }
        .hero-text h1 {
            font-family: var(--font-title);
            font-weight: 800;
            font-size: 48px;
            line-height: 1.25;
            margin-bottom: 20px;
            color: white;
        }
        .hero-text p {
            font-size: 20px;
            color: #CCCCDD;
            margin-bottom: 32px;
            max-width: 500px;
        }
        .hero-buttons {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }
        .btn-primary {
            background: var(--primary);
            color: white;
            padding: 14px 36px;
            border-radius: var(--radius-md);
            font-weight: 700;
            font-size: 16px;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            transition: background var(--transition), transform 0.2s, box-shadow var(--transition);
        }
        .btn-primary:hover {
            background: var(--primary-hover);
            transform: translateY(-3px);
            box-shadow: 0 8px 22px var(--primary-glow);
        }
        .btn-outline-light {
            background: transparent;
            border: 2px solid white;
            color: white;
            padding: 12px 32px;
            border-radius: var(--radius-md);
            font-weight: 600;
            transition: 0.3s;
        }
        .btn-outline-light:hover {
            background: white;
            color: var(--dark);
        }
        .hero-image {
            background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
            border-radius: 20px;
            height: 420px;
            box-shadow: 0 20px 40px rgba(0,0,0,0.5);
            position: relative;
            overflow: hidden;
        }
        .hero-image::after {
            content: '';
            position: absolute;
            inset: 0;
            background: rgba(26,26,46,0.35);
        }
        .floating-effect {
            animation: float 6s ease-in-out infinite;
        }
        @keyframes float {
            0%, 100% { transform: translateY(0); }
            50% { transform: translateY(-12px); }
        }

        /* 板块通用 */
        .section {
            padding: var(--section-gap) 0;
        }
        .section-title {
            font-family: var(--font-title);
            font-weight: 700;
            font-size: 36px;
            margin-bottom: 48px;
            color: var(--dark);
            text-align: center;
        }

        /* 服务区 */
        .services-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 28px;
        }
        .service-card {
            background: white;
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-card);
            box-shadow: var(--shadow-sm);
            overflow: hidden;
            transition: transform 0.3s, box-shadow 0.3s;
        }
        .service-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
        }
        .service-large {
            display: flex;
            flex-direction: column;
        }
        .service-img {
            height: 200px;
            background-size: cover;
            background-position: center;
        }
        .service-content {
            padding: 28px;
        }
        .service-content h3 {
            font-weight: 700;
            font-size: 22px;
            margin-bottom: 10px;
        }
        .service-small .service-content {
            padding: 24px;
        }

        /* 数据区 */
        .stats-section {
            background: var(--bg-gray);
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 32px;
            text-align: center;
        }
        .stat-item .stat-number {
            font-family: var(--font-mono);
            font-weight: 700;
            font-size: 48px;
            color: var(--primary);
            letter-spacing: -0.5px;
        }
        .stat-label {
            color: var(--text-secondary);
            margin-top: 8px;
        }

        /* 案例卡片 */
        .case-card {
            background: white;
            border-radius: var(--radius-lg);
            display: flex;
            box-shadow: var(--shadow-sm);
            overflow: hidden;
            margin-bottom: 32px;
            transition: transform 0.3s;
        }
        .case-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        .case-text {
            padding: 40px;
            flex: 1;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }
        .case-img {
            flex: 1;
            background-size: cover;
            background-position: center;
            min-height: 280px;
            transition: transform 0.4s;
        }
        .case-card:hover .case-img {
            transform: scale(1.03);
        }

        /* 信任区 */
        .trust-flex {
            display: flex;
            gap: 60px;
            align-items: center;
        }
        .trust-list i {
            color: var(--primary);
            margin-right: 12px;
        }

        /* FAQ */
        .faq-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }
        .faq-item {
            background: white;
            border: 1px solid var(--border-card);
            border-radius: var(--radius-md);
            padding: 16px 24px;
            cursor: pointer;
        }
        .faq-question {
            font-weight: 600;
            display: flex;
            justify-content: space-between;
        }
        .faq-answer {
            color: var(--text-secondary);
            margin-top: 12px;
            display: none;
        }
        .faq-item.open {
            border-color: var(--accent);
        }
        .faq-item.open .faq-answer {
            display: block;
        }

        /* CTA */
        .cta-full {
            background: var(--dark);
            color: white;
            text-align: center;
            padding: 80px 20px;
        }

        /* Footer */
        .footer {
            background: var(--darker);
            color: #AAA;
            padding: 60px 0 20px;
        }

        @media (max-width: 1024px) {
            .hero-grid { grid-template-columns: 1fr; }
            .services-grid { grid-template-columns: 1fr 1fr; }
            .stats-grid { grid-template-columns: repeat(2,1fr); }
            .faq-grid { grid-template-columns: 1fr; }
        }
        @media (max-width: 640px) {
            .nav-links { display: none; }
            .hamburger { display: block; }
            .services-grid { grid-template-columns: 1fr; }
            .trust-flex { flex-direction: column; }
            .case-card { flex-direction: column; }
            .hero-text h1 { font-size: 32px; }
        }