/* roulang page: index */
:root {
            --primary: #0F2B46;
            --primary-light: #1A3A5C;
            --accent: #E8473A;
            --accent-hover: #C0392B;
            --green: #1DBF8C;
            --bg: #F9FAFB;
            --card-bg: #FFFFFF;
            --text: #374151;
            --text-light: #6B7280;
            --border: #E5E7EB;
            --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
            --shadow-md: 0 4px 20px rgba(0,0,0,0.06);
            --shadow-lg: 0 8px 30px rgba(0,0,0,0.08);
            --radius-sm: 8px;
            --radius-md: 16px;
            --radius-lg: 24px;
            --transition: 0.25s ease;
        }

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

        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
            background-color: var(--bg);
            color: var(--text);
            line-height: 1.7;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
        }

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

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

        button, .button {
            cursor: pointer;
            font-family: inherit;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* 导航 */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            background: #fff;
            z-index: 100;
            box-shadow: 0 2px 12px rgba(0,0,0,0.04);
            transition: box-shadow var(--transition);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
        }

        .logo {
            font-size: 24px;
            font-weight: 700;
            color: var(--primary);
            letter-spacing: 1px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .logo i {
            color: var(--accent);
            font-size: 28px;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 32px;
        }

        .main-nav a {
            font-size: 15px;
            font-weight: 600;
            color: #1F2937;
            position: relative;
            padding: 8px 0;
        }

        .main-nav a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            width: 0;
            height: 2px;
            background: var(--accent);
            transition: width 0.2s ease, left 0.2s ease;
        }

        .main-nav a:hover {
            color: var(--accent);
        }
        .main-nav a:hover::after {
            width: 100%;
            left: 0;
        }

        .mega-trigger {
            position: relative;
            display: flex;
            align-items: center;
            gap: 6px;
            font-weight: 600;
            font-size: 15px;
            color: #1F2937;
            cursor: pointer;
            padding: 8px 0;
        }
        .mega-trigger i {
            font-size: 14px;
            transition: transform 0.2s;
        }

        .mega-panel {
            position: absolute;
            top: 100%;
            right: 0;
            width: 680px;
            background: #FAFAFA;
            box-shadow: 0 12px 32px rgba(0,0,0,0.1);
            border-radius: 16px;
            padding: 28px;
            display: flex;
            gap: 32px;
            opacity: 0;
            visibility: hidden;
            transform: translateY(10px);
            transition: all 0.2s ease;
            pointer-events: none;
            z-index: 50;
        }

        .mega-trigger:hover .mega-panel,
        .mega-trigger:focus-within .mega-panel {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
            pointer-events: auto;
        }

        .mega-col {
            flex: 1;
            border-right: 1px solid var(--border);
            padding-right: 20px;
        }
        .mega-col:last-child {
            border-right: none;
            padding-right: 0;
        }
        .mega-col h4 {
            font-size: 14px;
            font-weight: 700;
            margin-bottom: 16px;
            color: var(--primary);
        }
        .mega-card {
            display: flex;
            gap: 10px;
            margin-bottom: 14px;
            align-items: center;
        }
        .mega-card img {
            width: 44px;
            height: 44px;
            border-radius: 8px;
            object-fit: cover;
        }
        .mega-card span {
            font-size: 14px;
            font-weight: 600;
        }

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

        @media (max-width: 1024px) {
            .main-nav {
                display: none;
            }
            .hamburger {
                display: block;
            }
        }

        /* Hero */
        .hero {
            background: linear-gradient(135deg, #0F2B46 0%, #1A3A5C 100%);
            padding: 140px 0 100px;
            color: white;
            position: relative;
            overflow: hidden;
        }
        .hero .container {
            display: flex;
            align-items: center;
            gap: 60px;
            position: relative;
            z-index: 2;
        }
        .hero-text {
            flex: 1;
        }
        .hero h1 {
            font-size: 38px;
            font-weight: 700;
            line-height: 1.2;
            margin-bottom: 16px;
            letter-spacing: 0.5px;
        }
        .hero .subtitle {
            font-size: 18px;
            opacity: 0.85;
            margin-bottom: 32px;
            max-width: 480px;
            line-height: 1.6;
        }
        .hero-buttons {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }
        .btn-primary {
            background: var(--accent);
            color: white;
            padding: 14px 32px;
            border-radius: 8px;
            font-weight: 600;
            border: none;
            transition: background var(--transition);
            display: inline-block;
        }
        .btn-primary:hover {
            background: var(--accent-hover);
            color: white;
        }
        .btn-outline {
            background: transparent;
            border: 2px solid white;
            color: white;
            padding: 14px 32px;
            border-radius: 8px;
            font-weight: 600;
            transition: all var(--transition);
            display: inline-block;
        }
        .btn-outline:hover {
            background: rgba(255,255,255,0.1);
            color: white;
        }
        .hero-image {
            flex: 1;
            transform: perspective(800px) rotateY(-5deg);
            border-radius: 24px;
            overflow: hidden;
            box-shadow: 0 20px 40px rgba(0,0,0,0.3);
        }
        .floating-badge {
            position: absolute;
            top: 20px;
            right: 20px;
            background: rgba(255,255,255,0.15);
            backdrop-filter: blur(8px);
            padding: 8px 18px;
            border-radius: 20px;
            font-size: 13px;
            font-weight: 600;
            color: white;
        }
        @media (max-width: 768px) {
            .hero .container {
                flex-direction: column;
                gap: 40px;
            }
            .hero h1 {
                font-size: 30px;
            }
        }

        /* 通用板块 */
        .section {
            padding: 80px 0;
        }
        .section-title {
            font-size: 28px;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 12px;
            text-align: center;
        }
        .section-sub {
            color: var(--text-light);
            text-align: center;
            margin-bottom: 48px;
            font-size: 16px;
        }

        /* 卡片网格 */
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .card {
            background: var(--card-bg);
            border-radius: var(--radius-md);
            padding: 32px 24px;
            box-shadow: var(--shadow-md);
            transition: all var(--transition);
        }
        .card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }
        .card img {
            width: 56px;
            height: 56px;
            margin-bottom: 20px;
        }
        .card h3 {
            font-size: 20px;
            font-weight: 600;
            margin-bottom: 10px;
        }
        .card p {
            color: var(--text-light);
            font-size: 15px;
            line-height: 1.6;
        }

        @media (max-width: 1024px) {
            .grid-3 {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 640px) {
            .grid-3 {
                grid-template-columns: 1fr;
            }
            .section {
                padding: 60px 0;
            }
        }

        /* 产品体系 */
        .product-group {
            margin-bottom: 48px;
            display: flex;
            gap: 40px;
            align-items: flex-start;
            border-bottom: 1px solid var(--border);
            padding-bottom: 40px;
        }
        .product-group:last-child {
            border-bottom: none;
        }
        .product-left {
            flex: 1;
        }
        .product-left h3 {
            font-size: 24px;
            font-weight: 700;
        }
        .product-right {
            flex: 2;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }
        .feature-item {
            display: flex;
            gap: 12px;
            align-items: flex-start;
        }
        .feature-item i {
            color: var(--green);
            font-size: 20px;
            margin-top: 3px;
        }
        @media (max-width: 768px) {
            .product-group {
                flex-direction: column;
            }
            .product-right {
                grid-template-columns: 1fr;
            }
        }

        /* 场景卡片 */
        .scene-card {
            background: white;
            border-radius: 20px;
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }
        .scene-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .scene-img {
            height: 200px;
            background-size: cover;
            background-position: center;
        }
        .scene-info {
            padding: 20px;
        }

        /* 案例区 */
        .cases-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            background: #F5F7FA;
            border-radius: 24px;
            padding: 40px;
        }
        .logo-wall {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            align-items: center;
            filter: grayscale(1);
            transition: filter 0.3s;
        }
        .logo-wall:hover {
            filter: grayscale(0);
        }
        .testimonial blockquote {
            font-size: 18px;
            font-style: italic;
            position: relative;
            padding-left: 30px;
        }
        .testimonial blockquote::before {
            content: '"';
            font-size: 48px;
            color: var(--green);
            position: absolute;
            left: 0;
            top: -10px;
        }
        @media (max-width: 768px) {
            .cases-grid {
                grid-template-columns: 1fr;
            }
        }

        /* 价格卡 */
        .pricing-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .price-card {
            background: white;
            border-radius: 24px;
            padding: 32px;
            text-align: center;
            box-shadow: var(--shadow-sm);
            position: relative;
            transition: var(--transition);
        }
        .price-card.featured {
            border: 2px solid var(--accent);
            transform: scale(1.03);
            box-shadow: var(--shadow-md);
        }
        .badge {
            background: var(--accent);
            color: white;
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: 600;
            position: absolute;
            top: -12px;
            left: 50%;
            transform: translateX(-50%);
        }
        .price {
            font-size: 36px;
            font-weight: 700;
            color: var(--primary);
            margin: 16px 0;
        }
        @media (max-width: 768px) {
            .pricing-grid {
                grid-template-columns: 1fr;
            }
            .price-card.featured {
                transform: none;
            }
        }

        /* FAQ */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }
        .faq-item {
            background: white;
            border: 1px solid var(--border);
            border-radius: 12px;
            margin-bottom: 12px;
            overflow: hidden;
        }
        .faq-question {
            padding: 18px 24px;
            font-weight: 600;
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            background: white;
            border-left: 3px solid transparent;
            transition: all 0.2s;
        }
        .faq-answer {
            padding: 0 24px 18px;
            color: var(--text-light);
            display: none;
        }
        .faq-item.active .faq-question {
            border-left-color: var(--green);
        }
        .faq-item.active .faq-answer {
            display: block;
        }
        .faq-item.active .fa-chevron-down {
            transform: rotate(180deg);
            color: var(--green);
        }

        /* CTA */
        .cta-block {
            background: var(--primary);
            color: white;
            text-align: center;
            padding: 80px 20px;
            position: relative;
            overflow: hidden;
        }
        .cta-block h2 {
            font-size: 32px;
            margin-bottom: 16px;
        }

        /* Footer */
        .site-footer {
            background: var(--primary);
            color: rgba(255,255,255,0.7);
            padding: 60px 0 20px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 30px;
        }
        .footer-brand p {
            margin-top: 12px;
            font-size: 14px;
        }
        .footer-links h4 {
            color: white;
            margin-bottom: 12px;
        }
        .footer-links a {
            display: block;
            margin-bottom: 8px;
            font-size: 14px;
        }
        .footer-links a:hover {
            color: var(--accent);
        }
        .copyright {
            border-top: 1px solid rgba(255,255,255,0.2);
            margin-top: 40px;
            padding-top: 20px;
            text-align: center;
            font-size: 14px;
        }
        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media (max-width: 480px) {
            .footer-grid {
                grid-template-columns: 1fr;
            }
        }

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