/* roulang page: index */
:root {
            /* 主色系 */
            --primary-deep: #1A1A2E;
            --primary-accent: #E94560;
            --primary-accent-hover: #C93350;
            --secondary-blue: #0F3460;
            --gold-accent: #D4AF37;
            /* 背景与表面 */
            --bg-light: #F8F9FA;
            --bg-white: #FFFFFF;
            --bg-card: #FFFFFF;
            --bg-faq-expand: #FAFAFA;
            /* 文字色 */
            --text-heading: #1A1A2E;
            --text-body: #4A4A5A;
            --text-muted: #6C6C7C;
            --text-footer: #FFFFFF;
            --text-footer-muted: #8A8A9A;
            /* 边框与阴影 */
            --border-light: rgba(0, 0, 0, 0.04);
            --border-medium: #D0D0D0;
            --border-faq: #E0E0E0;
            --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.04);
            --shadow-card-hover: 0 12px 32px rgba(0, 0, 0, 0.08);
            --shadow-nav: 0 2px 12px rgba(0, 0, 0, 0.06);
            /* 尺寸与圆角 */
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-btn: 8px;
            --max-width: 1280px;
            --nav-height: 72px;
            --nav-height-mobile: 60px;
            --section-padding: 120px 0;
            --section-padding-mobile: 80px 0;
        }
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", "Roboto", sans-serif;
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-body);
            background-color: var(--bg-light);
            -webkit-font-smoothing: antialiased;
            text-rendering: optimizeLegibility;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: color 0.25s ease;
        }
        button, input, textarea {
            font-family: inherit;
        }
        .container {
            max-width: var(--max-width);
            margin-left: auto;
            margin-right: auto;
            padding-left: 24px;
            padding-right: 24px;
        }
        /* 导航栏 */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: var(--nav-height);
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            box-shadow: 0 1px 0 rgba(0,0,0,0.02);
            z-index: 1000;
            transition: box-shadow 0.3s ease, background 0.3s ease;
        }
        .site-header.scrolled {
            box-shadow: var(--shadow-nav);
            background: rgba(255,255,255,0.96);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .logo {
            font-size: 1.4rem;
            font-weight: 700;
            color: var(--primary-deep);
            letter-spacing: -0.5px;
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .logo span {
            color: var(--primary-accent);
        }
        .nav-menu {
            display: flex;
            align-items: center;
            gap: 32px;
            list-style: none;
        }
        .nav-menu a {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-body);
            transition: color 0.2s;
            position: relative;
        }
        .nav-menu a:hover,
        .nav-menu a.active {
            color: var(--primary-accent);
        }
        .nav-cta {
            background: var(--primary-accent);
            color: #fff !important;
            padding: 10px 22px;
            border-radius: var(--radius-btn);
            font-weight: 600;
            transition: background 0.25s ease, transform 0.2s;
        }
        .nav-cta:hover {
            background: var(--primary-accent-hover);
            transform: scale(1.03);
        }
        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            background: transparent;
            border: none;
            padding: 8px;
            z-index: 1001;
        }
        .hamburger span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: var(--primary-deep);
            border-radius: 2px;
            transition: all 0.3s ease;
        }
        .mobile-menu {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100vh;
            background: rgba(255,255,255,0.98);
            backdrop-filter: blur(16px);
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 32px;
            list-style: none;
            z-index: 999;
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.35s ease;
        }
        .mobile-menu.active {
            display: flex;
            opacity: 1;
            pointer-events: auto;
        }
        .mobile-menu a {
            font-size: 1.4rem;
            font-weight: 600;
            color: var(--primary-deep);
        }
        /* Hero 首屏 */
        .hero-section {
            padding: calc(var(--nav-height) + 60px) 0 100px;
            background: linear-gradient(135deg, #ffffff 0%, #f2f4f8 100%);
        }
        .hero-grid {
            display: grid;
            grid-template-columns: 5fr 7fr;
            gap: 48px;
            align-items: center;
        }
        .hero-content h1 {
            font-size: 3.8rem;
            font-weight: 700;
            letter-spacing: -0.02em;
            color: var(--primary-deep);
            line-height: 1.2;
            margin-bottom: 24px;
        }
        .hero-content .subtitle {
            font-size: 1.2rem;
            color: var(--text-body);
            margin-bottom: 36px;
            max-width: 480px;
        }
        .hero-buttons {
            display: flex;
            gap: 20px;
            flex-wrap: wrap;
        }
        .btn-primary {
            background: var(--primary-accent);
            color: #fff;
            font-weight: 600;
            padding: 14px 32px;
            border: none;
            border-radius: var(--radius-btn);
            cursor: pointer;
            font-size: 1rem;
            transition: background 0.25s, transform 0.2s;
        }
        .btn-primary:hover {
            background: var(--primary-accent-hover);
            transform: scale(1.03);
        }
        .btn-outline {
            background: transparent;
            color: var(--primary-deep);
            border: 2px solid var(--primary-deep);
            font-weight: 600;
            padding: 12px 30px;
            border-radius: var(--radius-btn);
            cursor: pointer;
            transition: all 0.25s;
        }
        .btn-outline:hover {
            background: var(--primary-deep);
            color: #fff;
        }
        .hero-image-wrapper {
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: 0 20px 40px rgba(0,0,0,0.08);
        }
        .hero-image-wrapper img {
            width: 100%;
            aspect-ratio: 4/3;
            object-fit: cover;
        }
        /* 板块通用 */
        .section {
            padding: var(--section-padding);
        }
        .section-header {
            text-align: center;
            margin-bottom: 64px;
        }
        .section-header h2 {
            font-size: 2.4rem;
            font-weight: 600;
            color: var(--text-heading);
            margin-bottom: 12px;
        }
        .section-header .decor {
            width: 48px;
            height: 3px;
            background: var(--primary-accent);
            margin: 16px auto;
            border-radius: 4px;
        }
        /* 亮点网格 */
        .highlights-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 32px 24px;
        }
        .highlight-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 32px 24px;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-card);
            transition: all 0.3s ease;
        }
        .highlight-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-6px);
        }
        .highlight-icon {
            width: 52px;
            height: 52px;
            background: rgba(15, 52, 96, 0.08);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 20px;
            color: var(--secondary-blue);
            font-size: 1.6rem;
        }
        .highlight-card h3 {
            font-size: 1.4rem;
            font-weight: 600;
            color: var(--text-heading);
            margin-bottom: 10px;
        }
        /* 案例瀑布 */
        .cases-waterfall {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .case-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            transition: 0.3s;
            position: relative;
        }
        .case-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-5px);
        }
        .case-img {
            position: relative;
            overflow: hidden;
            aspect-ratio: 3/2;
        }
        .case-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }
        .case-card:hover .case-img img {
            transform: scale(1.05);
        }
        .case-overlay {
            position: absolute;
            inset: 0;
            background: rgba(26,26,46,0.55);
            display: flex;
            align-items: center;
            justify-content: center;
            opacity: 0;
            transition: 0.3s;
            color: #fff;
            font-weight: 600;
        }
        .case-card:hover .case-overlay {
            opacity: 1;
        }
        .case-info {
            padding: 20px;
        }
        .case-tag {
            display: inline-block;
            border: 1px solid var(--primary-accent);
            color: var(--primary-accent);
            font-size: 0.8rem;
            padding: 4px 12px;
            border-radius: 20px;
            margin-bottom: 8px;
        }
        /* 方案对比 */
        .compare-table {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }
        .plan-col {
            background: white;
            border-radius: var(--radius-lg);
            padding: 32px 24px;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-card);
            text-align: center;
            transition: 0.3s;
            position: relative;
        }
        .plan-col.recommended {
            border: 2px solid var(--gold-accent);
            transform: scale(1.02);
        }
        .plan-badge {
            position: absolute;
            top: -12px;
            right: 20px;
            background: var(--gold-accent);
            color: #fff;
            font-size: 0.75rem;
            padding: 4px 14px;
            border-radius: 20px;
            font-weight: 600;
        }
        .plan-header {
            background: var(--secondary-blue);
            color: #fff;
            padding: 20px;
            border-radius: 12px;
            margin-bottom: 24px;
        }
        .plan-feature {
            padding: 12px 0;
            border-bottom: 1px solid #eee;
            display: flex;
            justify-content: space-between;
        }
        /* FAQ */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }
        .faq-item {
            border-bottom: 1px solid var(--border-faq);
        }
        .faq-question {
            width: 100%;
            background: transparent;
            border: none;
            padding: 20px 0;
            font-size: 1.25rem;
            font-weight: 600;
            text-align: left;
            display: flex;
            justify-content: space-between;
            cursor: pointer;
            color: var(--text-heading);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.3s;
            background: var(--bg-faq-expand);
            padding: 0 16px;
        }
        .faq-item.active .faq-answer {
            max-height: 200px;
            padding: 16px;
        }
        /* 底部CTA */
        .cta-section {
            background: var(--primary-deep);
            color: white;
            text-align: center;
            padding: 100px 0;
        }
        .cta-section h2 {
            font-size: 2.6rem;
        }
        .footer {
            background: #0d0d1a;
            color: #ccc;
            padding: 60px 0 20px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
        }
        @media (max-width: 1024px) {
            .hero-grid { grid-template-columns: 1fr; }
            .highlights-grid { grid-template-columns: repeat(2,1fr); }
            .cases-waterfall { grid-template-columns: repeat(2,1fr); }
            .compare-table { grid-template-columns: 1fr; }
        }
        @media (max-width: 768px) {
            .nav-menu { display: none; }
            .hamburger { display: flex; }
            .hero-content h1 { font-size: 2.4rem; }
            .highlights-grid, .cases-waterfall { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr; }
        }