/* roulang page: index */
:root {
            --primary: #F05A28;
            --primary-light: #F08B5A;
            --primary-soft: #FFF3ED;
            --secondary: #2E3A46;
            --secondary-dark: #1B252F;
            --bg: #F7F4F0;
            --white: #FFFFFF;
            --text: #5A6570;
            --text-light: #8B959F;
            --border-light: #DDE2E8;
            --success: #2DA94F;
            --warning: #E6A817;
            --error: #D14343;
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --radius-pill: 50px;
            --shadow-card: 0 4px 20px rgba(0,0,0,0.06);
            --shadow-card-hover: 0 8px 32px rgba(0,0,0,0.10);
            --shadow-nav: 0 2px 24px rgba(0,0,0,0.08);
            --transition-base: 0.3s ease-in-out;
        }

        * {
            box-sizing: border-box;
        }

        body {
            font-family: 'Noto Sans SC', 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
            font-weight: 400;
            line-height: 1.75;
            color: var(--text);
            background-color: var(--bg);
            margin: 0;
            padding: 0;
            -webkit-font-smoothing: antialiased;
        }

        h1, h2, h3, h4, .h1, .h2, .h3 {
            font-family: 'Noto Sans SC', 'Inter', sans-serif;
            color: var(--secondary);
            font-weight: 600;
            line-height: 1.3;
            margin-top: 0;
        }

        h1 {
            font-size: 3.5rem;
            font-weight: 700;
            letter-spacing: -0.02em;
            line-height: 1.2;
            color: var(--secondary);
        }

        h2 {
            font-size: 2.625rem;
            font-weight: 600;
            margin-bottom: 1rem;
        }

        h3 {
            font-size: 1.5rem;
            font-weight: 600;
            color: var(--secondary);
        }

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

        a:hover {
            color: var(--primary-light);
        }

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

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.5rem;
        }

        /* 导航 - 悬浮胶囊 */
        .top-nav {
            position: fixed;
            top: 16px;
            left: 50%;
            transform: translateX(-50%);
            width: calc(100% - 32px);
            max-width: 1200px;
            z-index: 100;
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-radius: var(--radius-pill);
            box-shadow: var(--shadow-nav);
            padding: 0.75rem 2rem;
            display: flex;
            align-items: center;
            justify-content: space-between;
            transition: all var(--transition-base);
        }

        .logo {
            font-size: 1.6rem;
            font-weight: 700;
            color: var(--secondary);
            display: flex;
            align-items: center;
            gap: 0.5rem;
            text-decoration: none;
            white-space: nowrap;
        }

        .logo i {
            color: var(--primary);
            font-size: 2rem;
        }

        .nav-links {
            display: flex;
            gap: 2rem;
            align-items: center;
            list-style: none;
            margin: 0;
            padding: 0;
        }

        .nav-links a {
            color: var(--secondary);
            font-weight: 500;
            font-size: 1rem;
            position: relative;
            padding: 0.25rem 0;
            transition: color var(--transition-base);
        }

        .nav-links a:hover,
        .nav-links a.active {
            color: var(--primary);
        }

        .nav-links a.active::after {
            content: '';
            position: absolute;
            bottom: -4px;
            left: 50%;
            transform: translateX(-50%);
            width: 6px;
            height: 6px;
            background: var(--primary);
            border-radius: 50%;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
            color: var(--white) !important;
            border: none;
            padding: 0.75rem 2rem;
            border-radius: var(--radius-pill);
            font-weight: 600;
            font-size: 0.95rem;
            letter-spacing: 0.02em;
            cursor: pointer;
            transition: all var(--transition-base);
            display: inline-block;
            text-align: center;
            box-shadow: 0 4px 12px rgba(240,90,40,0.25);
            white-space: nowrap;
        }

        .btn-primary:hover {
            filter: brightness(1.1);
            box-shadow: 0 0 20px rgba(240,90,40,0.5);
            transform: translateY(-2px);
            color: #fff !important;
        }

        .btn-outline {
            background: transparent;
            border: 2px solid var(--primary);
            color: var(--primary);
            padding: 0.7rem 2rem;
            border-radius: var(--radius-pill);
            font-weight: 600;
            transition: all var(--transition-base);
            display: inline-block;
            text-align: center;
        }

        .btn-outline:hover {
            background: var(--primary);
            color: #fff;
        }

        .hamburger {
            display: none;
            background: transparent;
            border: none;
            font-size: 1.8rem;
            color: var(--secondary);
            cursor: pointer;
        }

        /* Hero */
        .hero {
            min-height: 90vh;
            display: flex;
            align-items: center;
            padding: 120px 0 80px;
            background: linear-gradient(180deg, #FDF9F5 0%, var(--bg) 100%);
        }

        .hero-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 3rem;
            align-items: center;
        }

        .hero-badge-group {
            display: flex;
            gap: 1.5rem;
            margin-top: 2rem;
            flex-wrap: wrap;
        }

        .badge {
            background: var(--primary-soft);
            color: var(--primary);
            padding: 0.6rem 1.2rem;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.9rem;
            display: flex;
            align-items: center;
            gap: 0.4rem;
            transition: transform 0.2s;
        }

        .badge:hover {
            transform: scale(1.05);
        }

        .badge i {
            font-size: 1.2rem;
        }

        .hero-image {
            background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
            border-radius: 32px;
            min-height: 420px;
            box-shadow: 0 20px 40px rgba(0,0,0,0.15);
            position: relative;
            overflow: hidden;
        }

        /* 区块通用 */
        .section {
            padding: 120px 0;
        }

        .section-header {
            text-align: center;
            margin-bottom: 3.5rem;
        }

        .section-header p {
            font-size: 1.2rem;
            color: var(--text-light);
            max-width: 600px;
            margin: 0 auto;
        }

        /* 卡片网格 */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 2rem;
        }

        .feature-card {
            background: var(--white);
            border-radius: var(--radius-lg);
            padding: 2.5rem 2rem;
            box-shadow: var(--shadow-card);
            transition: all var(--transition-base);
            border-top: 4px solid transparent;
            position: relative;
        }

        .feature-card:hover {
            transform: translateY(-8px);
            box-shadow: var(--shadow-card-hover);
            border-top-color: var(--primary);
        }

        .feature-icon {
            font-size: 2.5rem;
            color: var(--primary);
            margin-bottom: 1.5rem;
        }

        .stat-badge {
            display: inline-flex;
            align-items: baseline;
            background: var(--primary-soft);
            padding: 0.4rem 1rem;
            border-radius: 20px;
            font-weight: 700;
            color: var(--primary);
            margin-top: 1rem;
        }

        /* 案例瀑布流 */
        .cases-masonry {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2rem;
        }

        .case-card {
            background: var(--white);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            transition: all var(--transition-base);
        }

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

        .case-card img {
            height: 240px;
            object-fit: cover;
            width: 100%;
        }

        .case-content {
            padding: 1.5rem;
        }

        .tag {
            background: #eef2f6;
            color: var(--secondary);
            padding: 0.2rem 0.8rem;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 500;
            display: inline-block;
            margin-bottom: 0.5rem;
        }

        /* 对比卡 */
        .compare-panel {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2rem;
            margin: 3rem 0;
        }

        .compare-card {
            padding: 2.5rem;
            border-radius: var(--radius-lg);
            background: #f0f2f4;
            transition: 0.3s;
        }

        .compare-card.highlight {
            background: linear-gradient(135deg, #FFF3ED, #fff);
            border: 2px solid var(--primary);
            box-shadow: 0 12px 30px rgba(240,90,40,0.12);
        }

        .check-list {
            list-style: none;
            padding: 0;
            margin: 1.5rem 0;
        }

        .check-list li {
            padding: 0.5rem 0;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        /* FAQ */
        .accordion-item {
            border-bottom: 1px solid rgba(240,90,40,0.15);
            padding: 1.2rem 0;
            cursor: pointer;
        }

        .accordion-title {
            display: flex;
            align-items: center;
            gap: 1rem;
            font-weight: 600;
            font-size: 1.1rem;
            color: var(--secondary);
        }

        .accordion-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease;
            color: var(--text);
            padding-left: 2.5rem;
        }

        .accordion-item.active .accordion-content {
            max-height: 200px;
        }

        /* CTA 区块 */
        .cta-block {
            background: linear-gradient(135deg, var(--secondary) 0%, var(--secondary-dark) 100%);
            color: white;
            text-align: center;
            border-radius: 32px;
            padding: 5rem 2rem;
            margin: 3rem 0;
        }

        .footer {
            background: var(--secondary-dark);
            color: #ccd6dd;
            padding: 4rem 0 2rem;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 2rem;
        }

        @media (max-width: 1024px) {
            h1 { font-size: 2.8rem; }
            .features-grid { grid-template-columns: 1fr 1fr; }
            .footer-grid { grid-template-columns: 1fr 1fr; }
        }

        @media (max-width: 768px) {
            .hamburger { display: block; }
            .nav-links {
                display: none;
                position: absolute;
                top: 80px;
                left: 0;
                width: 100%;
                background: rgba(255,255,255,0.98);
                flex-direction: column;
                padding: 2rem;
                border-radius: 24px;
                box-shadow: var(--shadow-nav);
            }
            .nav-links.show { display: flex; }
            .hero-grid { grid-template-columns: 1fr; }
            h1 { font-size: 2.2rem; }
            .features-grid, .cases-masonry, .compare-panel { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr; }
        }