/* roulang page: index */
:root {
            --primary: #1B365D;
            --primary-dark: #0F172A;
            --primary-light: #254b82;
            --accent: #FF6B35;
            --accent-hover: #fa5a1e;
            --bg-light: #F8FAFC;
            --bg-white: #FFFFFF;
            --text-main: #0F172A;
            --text-body: #334155;
            --text-muted: #64748B;
            --border-color: #E2E8F0;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-full: 9999px;
            --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
            --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.08);
            --shadow-hover: 0 20px 25px -5px rgba(0, 0, 0, 0.12);
            --transition: all 0.3s ease;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            -webkit-tap-highlight-color: transparent;
        }

        body {
            font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Heiti SC", sans-serif;
            color: var(--text-body);
            background-color: var(--bg-white);
            line-height: 1.75;
            font-size: 16px;
            overflow-x: hidden;
        }

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

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

        ul, ol {
            list-style: none;
        }

        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* 顶部通栏 */
        .top-bar {
            background-color: var(--primary-dark);
            color: #94A3B8;
            font-size: 13px;
            padding: 8px 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }
        .top-bar-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .top-info span {
            margin-right: 20px;
        }

        /* 主导航 */
        .main-header {
            position: sticky;
            top: 0;
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(8px);
            z-index: 1000;
            border-bottom: 1px solid var(--border-color);
        }
        .nav-container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 76px;
        }
        .logo {
            font-size: 24px;
            font-weight: 800;
            color: var(--primary);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .logo-badge {
            background: var(--accent);
            color: #fff;
            font-size: 11px;
            padding: 2px 8px;
            border-radius: var(--radius-full);
            font-weight: 600;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 32px;
        }
        .nav-links a {
            font-size: 15px;
            font-weight: 500;
            color: var(--text-main);
        }
        .nav-links a:hover {
            color: var(--accent);
        }
        .nav-cta {
            background-color: var(--accent);
            color: #fff;
            padding: 10px 22px;
            border-radius: var(--radius-full);
            font-size: 14px;
            font-weight: 600;
            transition: var(--transition);
        }
        .nav-cta:hover {
            background-color: var(--accent-hover);
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(255, 107, 53, 0.3);
        }

        /* 通用板块规范 */
        section {
            padding: 80px 0;
            position: relative;
        }
        .section-light {
            background-color: var(--bg-light);
        }
        .section-white {
            background-color: var(--bg-white);
        }
        .section-dark {
            background-color: var(--primary-dark);
            color: #F1F5F9;
        }
        .section-header {
            text-align: center;
            max-width: 760px;
            margin: 0 auto 50px;
        }
        .section-tag {
            display: inline-block;
            color: var(--accent);
            background: rgba(255, 107, 53, 0.1);
            padding: 4px 14px;
            border-radius: var(--radius-full);
            font-size: 13px;
            font-weight: 700;
            margin-bottom: 12px;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }
        .section-header h2 {
            font-size: 32px;
            font-weight: 800;
            color: var(--text-main);
            margin-bottom: 16px;
            line-height: 1.3;
        }
        .section-dark .section-header h2 {
            color: #FFFFFF;
        }
        .section-header p {
            font-size: 16px;
            color: var(--text-muted);
            line-height: 1.7;
        }
        .section-dark .section-header p {
            color: #94A3B8;
        }

        /* 1. 首屏轮播/展示区 */
        .hero-banner {
            position: relative;
            background: linear-gradient(rgba(15, 23, 42, 0.75), rgba(27, 54, 93, 0.85)), url('/assets/images/039874d6b6c965d6.webp') center/cover no-repeat;
            color: #FFFFFF;
            padding: 100px 0 80px;
        }
        .hero-content {
            max-width: 800px;
        }
        .hero-tag {
            background: rgba(255, 255, 255, 0.2);
            backdrop-filter: blur(4px);
            padding: 6px 16px;
            border-radius: var(--radius-full);
            font-size: 13px;
            font-weight: 600;
            display: inline-block;
            margin-bottom: 20px;
            border: 1px solid rgba(255, 255, 255, 0.3);
        }
        .hero-title {
            font-size: 44px;
            font-weight: 800;
            line-height: 1.25;
            margin-bottom: 20px;
            color: #FFFFFF;
        }
        .hero-desc {
            font-size: 17px;
            line-height: 1.8;
            color: #E2E8F0;
            margin-bottom: 36px;
        }
        .hero-actions {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
            margin-bottom: 40px;
        }
        .btn-primary {
            background-color: var(--accent);
            color: #FFFFFF;
            padding: 14px 32px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 16px;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            transition: var(--transition);
            border: none;
            cursor: pointer;
        }
        .btn-primary:hover {
            background-color: var(--accent-hover);
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(255, 107, 53, 0.3);
        }
        .btn-outline {
            background-color: transparent;
            color: #FFFFFF;
            padding: 14px 32px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 16px;
            border: 2px solid rgba(255, 255, 255, 0.6);
            transition: var(--transition);
        }
        .btn-outline:hover {
            background-color: rgba(255, 255, 255, 0.15);
            border-color: #FFFFFF;
        }
        .hero-badges {
            display: flex;
            gap: 24px;
            border-top: 1px solid rgba(255, 255, 255, 0.15);
            padding-top: 24px;
            font-size: 14px;
            color: #CBD5E1;
        }
        .badge-item strong {
            color: #FFFFFF;
        }

        /* 2. 学员痛点破局区 */
        .grid-4 {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .pain-card {
            background: #FFFFFF;
            padding: 30px 24px;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }
        .pain-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: var(--accent);
        }
        .pain-index {
            font-size: 32px;
            font-weight: 800;
            color: #E2E8F0;
            margin-bottom: 12px;
        }
        .pain-title {
            font-size: 18px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 10px;
        }
        .pain-text {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* 3. 多元课程总览区 */
        .overview-wrap {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }
        .overview-img-wrap {
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-md);
        }
        .overview-content h3 {
            font-size: 26px;
            font-weight: 800;
            color: var(--text-main);
            margin-bottom: 16px;
        }
        .overview-content p {
            font-size: 15px;
            color: var(--text-body);
            margin-bottom: 24px;
            line-height: 1.8;
        }
        .cefr-pills {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
            margin-bottom: 24px;
        }
        .cefr-pill {
            background: #EFF6FF;
            color: var(--primary);
            font-size: 13px;
            font-weight: 700;
            padding: 6px 14px;
            border-radius: var(--radius-sm);
            border: 1px solid #BFDBFE;
        }

        /* 4. 核心教学优势与师资 (6栅格) */
        .grid-6 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .adv-card {
            background: var(--bg-light);
            padding: 32px 28px;
            border-radius: var(--radius-md);
            border: 1px solid #E2E8F0;
            transition: var(--transition);
        }
        .adv-card:hover {
            background: #FFFFFF;
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
            border-color: #CBD5E1;
        }
        .adv-title {
            font-size: 19px;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 12px;
        }
        .adv-desc {
            font-size: 14px;
            color: var(--text-body);
            line-height: 1.65;
        }

        /* 5. 热门定制语言培训体系 (3列) */
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }
        .course-card {
            background: #FFFFFF;
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
            display: flex;
            flex-direction: column;
            transition: var(--transition);
        }
        .course-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
        }
        .course-img {
            height: 200px;
            overflow: hidden;
        }
        .course-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }
        .course-card:hover .course-img img {
            transform: scale(1.05);
        }
        .course-body {
            padding: 28px;
            display: flex;
            flex-direction: column;
            flex-grow: 1;
        }
        .course-tag {
            font-size: 12px;
            font-weight: 700;
            color: var(--accent);
            text-transform: uppercase;
            margin-bottom: 8px;
        }
        .course-title {
            font-size: 20px;
            font-weight: 800;
            color: var(--text-main);
            margin-bottom: 12px;
        }
        .course-desc {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.65;
            margin-bottom: 20px;
            flex-grow: 1;
        }
        .course-meta {
            border-top: 1px solid var(--border-color);
            padding-top: 16px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 13px;
            color: var(--text-body);
            margin-bottom: 20px;
        }
        .course-btn {
            display: block;
            text-align: center;
            background: var(--primary);
            color: #FFFFFF;
            padding: 12px;
            border-radius: var(--radius-sm);
            font-size: 14px;
            font-weight: 600;
        }
        .course-btn:hover {
            background: var(--accent);
        }

        /* 6. 阶梯式教学方法 */
        .roadmap-wrap {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            position: relative;
        }
        .step-item {
            background: #FFFFFF;
            padding: 32px 24px;
            border-radius: var(--radius-md);
            border-top: 4px solid var(--primary);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }
        .step-item:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
            border-top-color: var(--accent);
        }
        .step-num {
            font-size: 24px;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 8px;
        }
        .step-title {
            font-size: 18px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 10px;
        }
        .step-desc {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* 7. 深色理念与实战场景区 */
        .dark-content-grid {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 40px;
            align-items: center;
        }
        .dark-box {
            background: rgba(255, 255, 255, 0.05);
            padding: 32px;
            border-radius: var(--radius-md);
            border: 1px solid rgba(255, 255, 255, 0.1);
        }
        .dark-box h4 {
            font-size: 20px;
            color: #FFFFFF;
            margin-bottom: 12px;
        }
        .dark-box p {
            font-size: 14px;
            color: #94A3B8;
            line-height: 1.7;
        }

        /* 8. 效能指标数据条 */
        .stats-strip {
            background: var(--primary);
            color: #FFFFFF;
            padding: 50px 0;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            text-align: center;
        }
        .stat-value {
            font-size: 40px;
            font-weight: 800;
            color: var(--accent);
            line-height: 1.1;
            margin-bottom: 8px;
        }
        .stat-label {
            font-size: 15px;
            color: #E2E8F0;
        }

        /* 9. 真实学员蜕变故事 */
        .story-card {
            background: #FFFFFF;
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-color);
            overflow: hidden;
            display: grid;
            grid-template-columns: 1fr 1fr;
            box-shadow: var(--shadow-sm);
        }
        .story-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .story-info {
            padding: 40px;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }
        .story-tag {
            font-size: 12px;
            font-weight: 700;
            color: var(--accent);
            margin-bottom: 8px;
        }
        .story-name {
            font-size: 24px;
            font-weight: 800;
            color: var(--text-main);
            margin-bottom: 16px;
        }
        .story-quote {
            font-size: 15px;
            color: var(--text-body);
            line-height: 1.75;
            margin-bottom: 24px;
            font-style: italic;
        }
        .story-metrics {
            display: flex;
            gap: 20px;
            background: var(--bg-light);
            padding: 16px 20px;
            border-radius: var(--radius-sm);
        }
        .story-metric-val {
            font-size: 18px;
            font-weight: 700;
            color: var(--primary);
        }
        .story-metric-lbl {
            font-size: 12px;
            color: var(--text-muted);
        }

        /* 10. 多维口碑评价墙 */
        .review-card {
            background: #FFFFFF;
            padding: 28px;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }
        .stars {
            color: #FBBF24;
            margin-bottom: 12px;
            font-size: 14px;
        }
        .review-text {
            font-size: 14px;
            color: var(--text-body);
            line-height: 1.65;
            margin-bottom: 20px;
        }
        .reviewer-info {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .reviewer-avatar {
            width: 40px;
            height: 40px;
            background: #E2E8F0;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            color: var(--primary);
        }
        .reviewer-meta h5 {
            font-size: 14px;
            color: var(--text-main);
        }
        .reviewer-meta span {
            font-size: 12px;
            color: var(--text-muted);
        }

        /* 11. 资讯干货摘要 */
        .news-card {
            background: #FFFFFF;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }
        .news-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        .news-img {
            height: 180px;
            overflow: hidden;
        }
        .news-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .news-body {
            padding: 24px;
        }
        .news-date {
            font-size: 12px;
            color: var(--text-muted);
            margin-bottom: 8px;
        }
        .news-title {
            font-size: 17px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 10px;
            line-height: 1.4;
        }
        .news-desc {
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* 12. FAQ 手风琴 */
        .faq-accordion {
            max-width: 800px;
            margin: 0 auto;
        }
        .faq-item {
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            margin-bottom: 12px;
            overflow: hidden;
        }
        .faq-summary {
            padding: 20px 24px;
            font-size: 16px;
            font-weight: 700;
            color: var(--text-main);
            cursor: pointer;
            list-style: none;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .faq-summary::-webkit-details-marker {
            display: none;
        }
        .faq-summary::after {
            content: '+';
            font-size: 20px;
            color: var(--primary);
            font-weight: 400;
        }
        details[open] .faq-summary::after {
            content: '−';
        }
        .faq-content {
            padding: 0 24px 20px;
            font-size: 14px;
            color: var(--text-body);
            line-height: 1.7;
            border-top: 1px solid #F1F5F9;
            padding-top: 16px;
        }

        /* 转化收口区 */
        .cta-section {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            color: #FFFFFF;
            text-align: center;
            padding: 70px 0;
        }
        .cta-box {
            max-width: 700px;
            margin: 0 auto;
        }
        .cta-title {
            font-size: 32px;
            font-weight: 800;
            margin-bottom: 16px;
        }
        .cta-desc {
            font-size: 16px;
            color: #CBD5E1;
            margin-bottom: 32px;
        }
        .consult-form {
            display: flex;
            gap: 12px;
            justify-content: center;
            max-width: 500px;
            margin: 0 auto;
        }
        .consult-input {
            flex-grow: 1;
            padding: 14px 20px;
            border-radius: var(--radius-sm);
            border: 1px solid rgba(255, 255, 255, 0.2);
            background: rgba(255, 255, 255, 0.1);
            color: #FFFFFF;
            font-size: 15px;
            outline: none;
        }
        .consult-input::placeholder {
            color: #94A3B8;
        }
        .consult-input:focus {
            background: rgba(255, 255, 255, 0.2);
            border-color: var(--accent);
        }

        /* 页脚 */
        footer {
            background-color: #0B1120;
            color: #94A3B8;
            font-size: 14px;
            padding: 60px 0 30px;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.5fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand h4 {
            color: #FFFFFF;
            font-size: 20px;
            margin-bottom: 16px;
            font-weight: 800;
        }
        .footer-brand p {
            line-height: 1.7;
            margin-bottom: 16px;
        }
        .footer-links h5 {
            color: #FFFFFF;
            font-size: 16px;
            margin-bottom: 16px;
            font-weight: 700;
        }
        .footer-links ul li {
            margin-bottom: 10px;
        }
        .footer-links ul li a:hover {
            color: var(--accent);
        }
        .footer-bottom {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
            font-size: 13px;
        }

        /* 响应式断点 */
        @media (max-width: 1024px) {
            .grid-4 {
                grid-template-columns: repeat(2, 1fr);
            }
            .grid-6 {
                grid-template-columns: repeat(2, 1fr);
            }
            .roadmap-wrap {
                grid-template-columns: repeat(2, 1fr);
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 32px;
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .top-bar {
                display: none;
            }
            .nav-links {
                display: none;
            }
            .hero-title {
                font-size: 30px;
            }
            .section-header h2 {
                font-size: 24px;
            }
            .grid-4, .grid-6, .grid-3, .roadmap-wrap, .overview-wrap, .dark-content-grid, .story-card {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .consult-form {
                flex-direction: column;
            }
            section {
                padding: 50px 0;
            }
        }