/* roulang page: index */
:root {
            --primary: #1E1E1E;
            --primary-light: #2A2A2A;
            --accent: #00E5A0;
            --accent-hover: #00C98A;
            --accent-bg: rgba(0, 229, 160, 0.1);
            --bg: #F7F8FA;
            --white: #FFFFFF;
            --text: #2D2D2D;
            --text-secondary: #6B7280;
            --highlight: #F59E0B;
            --border: #E5E7EB;
            --radius-sm: 8px;
            --radius: 12px;
            --radius-lg: 20px;
            --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
            --shadow: 0 4px 12px rgba(0,0,0,0.06);
            --shadow-hover: 0 8px 24px rgba(0,0,0,0.1);
            --transition: 0.3s ease;
            --font-stack: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
            --section-gap: 90px;
        }

        * {
            box-sizing: border-box;
        }

        body {
            font-family: var(--font-stack);
            line-height: 1.7;
            color: var(--text);
            background-color: var(--bg);
            margin: 0;
            padding: 0;
            -webkit-font-smoothing: antialiased;
            scroll-behavior: smooth;
        }

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

        a:hover {
            color: var(--accent-hover);
        }

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

        button, .btn, input, textarea {
            font-family: var(--font-stack);
        }

        h1, h2, h3, h4, h5 {
            font-weight: 600;
            line-height: 1.3;
        }

        h1 {
            font-size: 38px;
            font-weight: 700;
            line-height: 1.2;
        }

        h2 {
            font-size: 28px;
            margin-bottom: 0.75rem;
        }

        h3 {
            font-size: 20px;
        }

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

        section {
            padding-top: var(--section-gap);
            padding-bottom: var(--section-gap);
        }

        /* 导航吸顶 */
        .navbar-custom {
            position: fixed;
            top: 0;
            width: 100%;
            z-index: 1050;
            transition: background var(--transition), box-shadow var(--transition), backdrop-filter var(--transition);
            background: transparent;
            padding: 10px 0;
        }

        .navbar-custom.scrolled {
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(12px);
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
            padding: 6px 0;
        }

        .navbar-brand-custom {
            font-weight: 700;
            font-size: 22px;
            letter-spacing: -0.3px;
            color: white;
            transition: color var(--transition);
        }

        .navbar-custom.scrolled .navbar-brand-custom {
            color: var(--primary);
        }

        .nav-link-custom {
            color: rgba(255,255,255,0.9);
            font-weight: 500;
            font-size: 15px;
            margin: 0 6px;
            transition: color var(--transition);
            padding: 6px 12px !important;
            border-radius: var(--radius-sm);
        }

        .navbar-custom.scrolled .nav-link-custom {
            color: var(--text);
        }

        .nav-link-custom:hover,
        .nav-link-custom.active {
            color: var(--accent) !important;
            background: rgba(255,255,255,0.15);
        }

        .navbar-custom.scrolled .nav-link-custom:hover,
        .navbar-custom.scrolled .nav-link-custom.active {
            background: var(--accent-bg);
        }

        .hot-tags .badge-tag {
            background: rgba(255,255,255,0.2);
            color: white;
            padding: 5px 14px;
            border-radius: 20px;
            font-size: 13px;
            font-weight: 500;
            transition: var(--transition);
            display: inline-block;
            margin-left: 8px;
        }

        .navbar-custom.scrolled .hot-tags .badge-tag {
            background: #f1f5f9;
            color: var(--text);
        }

        .badge-tag:hover {
            background: var(--accent);
            color: #111 !important;
            cursor: pointer;
        }

        .search-icon-btn {
            background: transparent;
            border: none;
            color: white;
            font-size: 18px;
            transition: color var(--transition);
            margin-left: 12px;
        }

        .navbar-custom.scrolled .search-icon-btn {
            color: var(--text);
        }

        .search-icon-btn:hover {
            color: var(--accent);
        }

        .navbar-toggler-custom {
            border: none;
            color: white;
            font-size: 24px;
        }

        .navbar-custom.scrolled .navbar-toggler-custom {
            color: var(--text);
        }

        /* Hero */
        .hero-section {
            min-height: 100vh;
            display: flex;
            align-items: center;
            background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
            position: relative;
            color: white;
        }

        .hero-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(135deg, rgba(0,0,0,0.75) 0%, rgba(0,0,0,0.35) 100%);
        }

        .hero-content {
            position: relative;
            z-index: 5;
            max-width: 700px;
        }

        .hero-content h1 {
            font-size: 42px;
            line-height: 1.2;
            margin-bottom: 1.2rem;
        }

        .hero-content .lead {
            font-size: 18px;
            opacity: 0.9;
            margin-bottom: 2rem;
        }

        .btn-primary-custom {
            background: var(--accent);
            border: none;
            color: #111;
            font-weight: 600;
            padding: 14px 30px;
            border-radius: var(--radius-sm);
            transition: var(--transition);
            letter-spacing: 0.4px;
            font-size: 16px;
            box-shadow: 0 4px 10px rgba(0,229,160,0.3);
        }

        .btn-primary-custom:hover {
            background: var(--accent-hover);
            transform: scale(1.02);
            box-shadow: 0 6px 18px rgba(0,229,160,0.4);
            color: #111;
        }

        .btn-outline-custom {
            border: 2px solid var(--accent);
            background: transparent;
            color: var(--accent);
            font-weight: 600;
            padding: 12px 28px;
            border-radius: var(--radius-sm);
            transition: var(--transition);
            letter-spacing: 0.4px;
            font-size: 16px;
        }

        .btn-outline-custom:hover {
            background: var(--accent-bg);
            border-color: var(--accent-hover);
            color: var(--accent-hover);
        }

        .trust-badge {
            background: rgba(255,255,255,0.15);
            backdrop-filter: blur(4px);
            padding: 8px 18px;
            border-radius: 30px;
            font-size: 14px;
            display: inline-block;
            margin-top: 2rem;
        }

        /* 卡片 */
        .card-custom {
            background: var(--white);
            border: none;
            border-radius: var(--radius);
            padding: 2rem;
            box-shadow: var(--shadow);
            transition: var(--transition);
            height: 100%;
        }

        .card-custom:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
        }

        .icon-circle {
            width: 64px;
            height: 64px;
            background: var(--accent-bg);
            color: var(--accent);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 28px;
            margin-bottom: 1.2rem;
            transition: var(--transition);
        }

        .card-custom:hover .icon-circle {
            transform: scale(1.05);
            background: var(--accent);
            color: white;
        }

        /* 不对称栅格 */
        .asymmetric-grid .left-card {
            margin-bottom: 20px;
        }

        /* 解决方案步骤 */
        .step-flow {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
        }

        .step-item {
            flex: 1;
            min-width: 220px;
            margin: 0 10px 20px;
            text-align: center;
        }

        .step-number {
            width: 56px;
            height: 56px;
            background: var(--primary);
            color: var(--accent);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            font-weight: 700;
            margin: 0 auto 1rem;
        }

        /* 大数字 */
        .stat-number {
            font-size: 42px;
            font-weight: 700;
            color: var(--highlight);
            line-height: 1.1;
        }

        /* 证言 */
        .testimonial-card {
            background: var(--white);
            border-radius: var(--radius);
            padding: 2rem;
            box-shadow: var(--shadow);
            display: flex;
            gap: 1.2rem;
            align-items: flex-start;
        }

        .testimonial-avatar {
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: #ddd;
            flex-shrink: 0;
            background-image: url('/assets/images/coverpic/cover-3.webp');
            background-size: cover;
        }

        /* FAQ */
        .accordion-custom .accordion-item {
            border: none;
            background: transparent;
            margin-bottom: 12px;
        }

        .accordion-custom .accordion-button {
            background: #f1f5f9;
            font-weight: 600;
            font-size: 18px;
            border-radius: var(--radius-sm) !important;
            padding: 16px 20px;
            box-shadow: none;
            color: var(--text);
            transition: var(--transition);
        }

        .accordion-custom .accordion-button:not(.collapsed) {
            background: var(--accent-bg);
            color: var(--text);
            box-shadow: none;
        }

        .accordion-custom .accordion-body {
            background: white;
            border-radius: 0 0 var(--radius-sm) var(--radius-sm);
            padding: 16px 20px;
            line-height: 1.8;
        }

        /* CTA 表单 */
        .cta-section {
            background: linear-gradient(135deg, #1E1E1E 0%, #2A2A2A 100%);
            color: white;
            border-radius: 28px;
            padding: 3rem 2rem;
        }

        .form-control-custom {
            border-radius: var(--radius-sm);
            border: 1px solid var(--border);
            padding: 12px 16px;
            font-size: 16px;
            transition: var(--transition);
        }

        .form-control-custom:focus {
            border-color: var(--accent);
            box-shadow: 0 0 0 3px rgba(0,229,160,0.25);
            outline: none;
        }

        /* 页脚 */
        .footer-custom {
            background: var(--primary);
            color: #ccc;
            padding: 3rem 0 1.5rem;
        }

        .footer-custom a {
            color: #aaa;
            transition: var(--transition);
        }

        .footer-custom a:hover {
            color: var(--accent);
        }

        .social-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            border: 1px solid #666;
            border-radius: 50%;
            color: #ccc;
            margin-right: 8px;
            transition: var(--transition);
            font-size: 18px;
        }

        .social-icon:hover {
            background: var(--accent);
            border-color: var(--accent);
            color: #111;
        }

        .copyright {
            border-top: 1px solid #333;
            padding-top: 1.2rem;
            margin-top: 2rem;
            font-size: 14px;
        }

        @media (max-width: 992px) {
            h1 { font-size: 32px; }
            h2 { font-size: 24px; }
            .hero-content h1 { font-size: 34px; }
            .navbar-custom { background: rgba(30,30,30,0.95); backdrop-filter: blur(8px); }
            .navbar-custom.scrolled { background: rgba(255,255,255,0.95); }
            section { padding-top: 60px; padding-bottom: 60px; }
            .testimonial-card { flex-direction: column; }
        }

        @media (max-width: 768px) {
            h1 { font-size: 28px; }
            h2 { font-size: 22px; }
            .hero-content h1 { font-size: 28px; }
            .stat-number { font-size: 32px; }
            .cta-section { padding: 2rem 1rem; }
        }