/* roulang page: index */
:root {
            --primary: #2C7BE5;
            --primary-dark: #1A5DB0;
            --primary-light: #E8F1FD;
            --accent: #E6A817;
            --bg: #F7F9FC;
            --white: #FFFFFF;
            --text: #1E293B;
            --text-light: #64748B;
            --text-lighter: #94A3B8;
            --border: #E2E8F0;
            --shadow: 0 2px 12px rgba(0,0,0,0.06);
            --shadow-hover: 0 4px 16px rgba(0,0,0,0.1);
            --radius: 12px;
            --radius-sm: 8px;
            --spacing: 80px;
            --spacing-mobile: 48px;
            --nav-height: 64px;
            --container: 1200px;
            --font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
        }
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { font-size: 16px; scroll-behavior: smooth; }
        body {
            font-family: var(--font-family);
            font-weight: 400;
            line-height: 1.6;
            color: var(--text);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
        }
        a { text-decoration: none; color: inherit; }
        img { max-width: 100%; height: auto; display: block; }
        button, input, textarea { font-family: inherit; }
        .container {
            max-width: var(--container);
            margin: 0 auto;
            padding: 0 24px;
        }
        /* Header */
        .header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: var(--white);
            height: var(--nav-height);
            box-shadow: 0 1px 4px rgba(0,0,0,0.04);
            display: flex;
            align-items: center;
        }
        .header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
        }
        .logo a {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--primary-dark);
            letter-spacing: 0.5px;
            white-space: nowrap;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 2rem;
            list-style: none;
        }
        .nav-links a {
            font-size: 0.95rem;
            color: var(--text);
            transition: color 0.2s;
            padding-bottom: 4px;
            border-bottom: 2px solid transparent;
        }
        .nav-links a:hover,
        .nav-links a.active {
            color: var(--primary);
            border-bottom-color: var(--primary);
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--text);
            cursor: pointer;
        }
        /* Progress Steps */
        .progress-bar {
            background: var(--white);
            border-bottom: 1px solid var(--border);
            padding: 12px 0;
            overflow-x: auto;
            white-space: nowrap;
            -webkit-overflow-scrolling: touch;
            scrollbar-width: none;
        }
        .progress-bar::-webkit-scrollbar { display: none; }
        .progress-steps {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 0;
            min-width: max-content;
            padding: 0 24px;
        }
        .step-item {
            display: flex;
            align-items: center;
            cursor: pointer;
            color: var(--text-light);
            transition: color 0.2s;
            font-size: 0.9rem;
            white-space: nowrap;
        }
        .step-item:hover,
        .step-item.active {
            color: var(--primary);
        }
        .step-item .step-num {
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: var(--bg);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            margin-right: 6px;
            font-weight: 700;
            transition: background 0.2s, color 0.2s;
        }
        .step-item.active .step-num {
            background: var(--primary);
            color: #fff;
        }
        .step-arrow {
            margin: 0 16px;
            color: var(--text-lighter);
        }
        @media (max-width: 768px) {
            .progress-steps { justify-content: flex-start; }
            .step-arrow { margin: 0 10px; }
        }
        /* Hero */
        .hero {
            position: relative;
            background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
            min-height: 600px;
            display: flex;
            align-items: center;
            color: #fff;
            z-index: 1;
        }
        .hero::before {
            content: '';
            position: absolute;
            top: 0; left: 0; right: 0; bottom: 0;
            background: rgba(0,0,0,0.55);
            z-index: -1;
        }
        .hero-content {
            max-width: 700px;
            padding: 80px 0;
        }
        .hero-content h1 {
            font-size: 2.5rem;
            line-height: 1.3;
            font-weight: 700;
            margin-bottom: 1.25rem;
            color: #fff;
        }
        .hero-content p {
            font-size: 1.1rem;
            line-height: 1.7;
            margin-bottom: 2rem;
            color: rgba(255,255,255,0.9);
        }
        .hero-badge {
            display: inline-block;
            background: rgba(255,255,255,0.15);
            backdrop-filter: blur(4px);
            border: 1px solid var(--accent);
            color: var(--accent);
            padding: 6px 18px;
            border-radius: 20px;
            font-size: 0.9rem;
            margin-bottom: 1.5rem;
        }
        .hero-cta {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            height: 44px;
            padding: 0 28px;
            border-radius: var(--radius-sm);
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.2s;
            border: none;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-1px);
            box-shadow: var(--shadow-hover);
        }
        .btn-outline {
            background: transparent;
            border: 2px solid #fff;
            color: #fff;
        }
        .btn-outline:hover {
            background: rgba(255,255,255,0.1);
            border-color: var(--accent);
            color: var(--accent);
        }
        @media (max-width: 768px) {
            .hero { min-height: 500px; }
            .hero-content { padding: 60px 0; }
            .hero-content h1 { font-size: 1.8rem; }
            .hero-content p { font-size: 1rem; }
        }
        /* Sections */
        section {
            padding: var(--spacing) 0;
        }
        .section-title {
            font-size: 1.75rem;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 0.75rem;
            text-align: center;
        }
        .section-desc {
            max-width: 640px;
            margin: 0 auto 3rem;
            text-align: center;
            color: var(--text-light);
            font-size: 1rem;
            line-height: 1.7;
        }
        @media (max-width: 768px) {
            section { padding: var(--spacing-mobile) 0; }
            .section-title { font-size: 1.5rem; }
        }
        /* Stats */
        .stats-grid {
            display: flex;
            justify-content: space-around;
            text-align: center;
            flex-wrap: wrap;
            gap: 2rem;
            background: var(--white);
            border-radius: var(--radius);
            padding: 2.5rem 1.5rem;
            box-shadow: var(--shadow);
        }
        .stat-item {
            flex: 1 1 180px;
            padding: 0 1rem;
            border-right: 1px solid var(--border);
        }
        .stat-item:last-child { border-right: none; }
        .stat-number {
            font-size: 2.2rem;
            font-weight: 700;
            color: var(--primary);
            line-height: 1.2;
        }
        .stat-label {
            color: var(--text-light);
            margin-top: 0.5rem;
            font-size: 0.95rem;
        }
        @media (max-width: 768px) {
            .stat-item { border-right: none; border-bottom: 1px solid var(--border); padding: 1rem 0; }
            .stat-item:last-child { border-bottom: none; }
        }
        /* Service Cards */
        .cards-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .card {
            background: var(--white);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            overflow: hidden;
            transition: transform 0.2s, box-shadow 0.2s;
            display: flex;
            flex-direction: column;
        }
        .card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        .card-img {
            height: 180px;
            object-fit: cover;
            width: 100%;
        }
        .card-body {
            padding: 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .card-title {
            font-size: 1.25rem;
            font-weight: 700;
            margin-bottom: 0.5rem;
        }
        .card-text {
            color: var(--text-light);
            font-size: 0.95rem;
            line-height: 1.5;
            margin-bottom: 1rem;
            flex: 1;
        }
        .card-icon {
            font-size: 1.5rem;
            color: var(--primary);
            margin-bottom: 0.75rem;
        }
        @media (max-width: 992px) {
            .cards-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 600px) {
            .cards-grid { grid-template-columns: 1fr; }
        }
        /* Process Steps */
        .process-list {
            display: flex;
            justify-content: space-between;
            gap: 24px;
            flex-wrap: wrap;
        }
        .process-item {
            flex: 1 1 200px;
            background: var(--white);
            border-radius: var(--radius);
            padding: 24px;
            box-shadow: var(--shadow);
            text-align: center;
            position: relative;
        }
        .process-item .step-num {
            width: 36px;
            height: 36px;
            background: var(--primary-light);
            color: var(--primary);
            border-radius: 50%;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            margin-bottom: 1rem;
        }
        .process-item h3 {
            font-size: 1.1rem;
            margin-bottom: 0.5rem;
        }
        .process-item p {
            color: var(--text-light);
            font-size: 0.9rem;
        }
        /* News & Guide */
        .news-layout {
            display: grid;
            grid-template-columns: 2fr 1fr;
            gap: 32px;
            align-items: start;
        }
        .news-list {
            list-style: none;
        }
        .news-list li {
            border-bottom: 1px solid var(--border);
            padding: 16px 0;
        }
        .news-list li a {
            display: flex;
            justify-content: space-between;
            align-items: baseline;
            color: var(--text);
            transition: color 0.2s;
        }
        .news-list li a:hover {
            color: var(--primary);
        }
        .news-list .news-title {
            font-weight: 500;
        }
        .news-list .news-date {
            color: var(--text-lighter);
            font-size: 0.85rem;
            margin-left: 1rem;
            white-space: nowrap;
        }
        .recommend-box {
            background: var(--white);
            border-radius: var(--radius);
            padding: 24px;
            box-shadow: var(--shadow);
        }
        .recommend-box h3 {
            font-size: 1.1rem;
            margin-bottom: 1rem;
            color: var(--primary-dark);
        }
        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .tag {
            background: var(--primary-light);
            color: var(--primary-dark);
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 0.85rem;
            transition: background 0.2s;
        }
        .tag:hover {
            background: var(--primary);
            color: #fff;
        }
        @media (max-width: 768px) {
            .news-layout { grid-template-columns: 1fr; }
        }
        /* Compare */
        .compare-wrapper {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 24px;
            flex-wrap: wrap;
        }
        .compare-card {
            flex: 1 1 300px;
            background: var(--white);
            border-radius: var(--radius);
            padding: 32px 24px;
            box-shadow: var(--shadow);
            position: relative;
        }
        .compare-card.left {
            border: 1px solid var(--border);
            background: #f9fafb;
        }
        .compare-card.right {
            border: 2px solid var(--primary);
            background: #fff;
        }
        .compare-card h3 {
            font-size: 1.3rem;
            margin-bottom: 1rem;
            text-align: center;
        }
        .compare-card ul {
            list-style: none;
            margin-top: 1rem;
        }
        .compare-card ul li {
            padding: 0.5rem 0;
            display: flex;
            align-items: center;
            gap: 8px;
            color: var(--text-light);
        }
        .compare-card ul li i {
            color: var(--primary);
        }
        .vs-badge {
            width: 60px;
            height: 60px;
            background: var(--primary);
            color: #fff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 1.2rem;
            flex-shrink: 0;
            box-shadow: var(--shadow-hover);
        }
        @media (max-width: 768px) {
            .compare-wrapper { flex-direction: column; }
            .vs-badge { margin: 16px 0; }
        }
        /* FAQ */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }
        .faq-item {
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            margin-bottom: 12px;
            background: var(--white);
        }
        .faq-question {
            width: 100%;
            text-align: left;
            background: none;
            border: none;
            padding: 18px 24px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            color: var(--text);
        }
        .faq-answer {
            padding: 0 24px 18px;
            color: var(--text-light);
            display: none;
            line-height: 1.6;
        }
        .faq-item.open .faq-answer {
            display: block;
        }
        .faq-item.open .faq-question {
            color: var(--primary);
        }
        .faq-item.open {
            border-left: 4px solid var(--primary);
        }
        .faq-question i {
            transition: transform 0.2s;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }
        /* CTA Form */
        .cta-section {
            background: linear-gradient(135deg, #EBF4FF 0%, #F0F7FF 100%);
        }
        .cta-wrapper {
            display: flex;
            align-items: center;
            gap: 48px;
            background: var(--white);
            border-radius: var(--radius);
            padding: 48px;
            box-shadow: var(--shadow);
            flex-wrap: wrap;
        }
        .cta-info {
            flex: 1 1 300px;
        }
        .cta-info h2 {
            font-size: 1.8rem;
            margin-bottom: 1rem;
        }
        .cta-info p {
            color: var(--text-light);
            line-height: 1.7;
        }
        .cta-form {
            flex: 1 1 300px;
        }
        .form-group {
            margin-bottom: 16px;
        }
        .form-group label {
            display: block;
            margin-bottom: 6px;
            font-weight: 500;
            font-size: 0.9rem;
        }
        .form-control {
            width: 100%;
            height: 44px;
            padding: 0 14px;
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            font-size: 0.95rem;
            transition: border 0.2s;
            background: #fff;
        }
        .form-control:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(44,123,229,0.1);
        }
        textarea.form-control {
            height: 90px;
            padding: 12px;
            resize: vertical;
        }
        .btn-submit {
            width: 100%;
            height: 48px;
            background: var(--primary);
            color: #fff;
            border: none;
            border-radius: var(--radius-sm);
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s;
        }
        .btn-submit:hover {
            background: var(--primary-dark);
        }
        @media (max-width: 768px) {
            .cta-wrapper { padding: 32px 24px; flex-direction: column; }
        }
        /* Footer */
        .footer {
            background: #1E293B;
            color: #CBD5E1;
            padding: 48px 0 24px;
        }
        .footer-content {
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 32px;
            margin-bottom: 32px;
        }
        .footer-brand {
            font-size: 1.3rem;
            font-weight: 700;
            color: #fff;
        }
        .footer-links {
            display: flex;
            gap: 48px;
            flex-wrap: wrap;
        }
        .footer-col h4 {
            color: #fff;
            margin-bottom: 12px;
            font-size: 1rem;
        }
        .footer-col a {
            display: block;
            color: #94A3B8;
            margin-bottom: 8px;
            transition: color 0.2s;
            font-size: 0.9rem;
        }
        .footer-col a:hover {
            color: var(--accent);
        }
        .footer-bottom {
            border-top: 1px solid #334155;
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            font-size: 0.85rem;
            color: #64748B;
        }
        .footer-bottom a {
            color: #94A3B8;
        }
        @media (max-width: 768px) {
            .footer-content { flex-direction: column; }
        }
        /* Mobile Nav */
        @media (max-width: 768px) {
            .nav-links {
                display: none;
                position: absolute;
                top: var(--nav-height);
                left: 0;
                right: 0;
                background: var(--white);
                flex-direction: column;
                padding: 16px;
                box-shadow: 0 4px 12px rgba(0,0,0,0.1);
                gap: 12px;
            }
            .nav-links.active { display: flex; }
            .hamburger { display: block; }
        }