/* roulang page: index */
:root {
      --primary: #0F2B48;
      --primary-dark: #0B1727;
      --primary-light: #1E3A8A;
      --accent: #1D63FF;
      --accent-hover: #154ecc;
      --amber: #F59E0B;
      --bg-page: #F8FAFC;
      --bg-card: #FFFFFF;
      --text-main: #0F172A;
      --text-body: #334155;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --radius-pill: 9999px;
      --shadow-sm: 0 2px 8px rgba(15, 43, 72, 0.04);
      --shadow-md: 0 4px 20px -2px rgba(15, 43, 72, 0.06);
      --shadow-lg: 0 14px 30px -4px rgba(15, 43, 72, 0.12);
      --container-max: 1240px;
      --header-height: 80px;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      line-height: 1.75;
      color: var(--text-body);
      background-color: var(--bg-page);
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.25s ease;
    }

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

    input, select, textarea, button {
      font-family: inherit;
      font-size: inherit;
      outline: none;
    }

    .container {
      width: 100%;
      max-width: var(--container-max);
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    .section-wrap {
      padding-top: 88px;
      padding-bottom: 88px;
      position: relative;
    }

    .section-dark {
      background-color: var(--primary-dark);
      color: #F8FAFC;
    }

    .section-white {
      background-color: #FFFFFF;
    }

    .section-alt {
      background-color: #F1F5F9;
    }

    .section-header {
      max-width: 780px;
      margin: 0 auto 52px auto;
      text-align: center;
    }

    .section-tag {
      display: inline-block;
      padding: 6px 16px;
      font-size: 0.875rem;
      font-weight: 600;
      color: var(--accent);
      background-color: rgba(29, 99, 255, 0.08);
      border-radius: var(--radius-pill);
      margin-bottom: 14px;
      letter-spacing: 0.5px;
    }

    .section-tag.dark-tag {
      background-color: rgba(245, 158, 11, 0.15);
      color: var(--amber);
    }

    .section-title {
      font-size: 2.25rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.35;
      margin-bottom: 16px;
      letter-spacing: -0.5px;
    }

    .section-dark .section-title {
      color: #FFFFFF;
    }

    .section-desc {
      font-size: 1.0625rem;
      color: var(--text-muted);
      line-height: 1.8;
    }

    .section-dark .section-desc {
      color: #94A3B8;
    }

    /* 按钮规范 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      min-height: 48px;
      min-width: 140px;
      padding: 12px 28px;
      font-size: 1rem;
      font-weight: 600;
      border-radius: var(--radius-sm);
      cursor: pointer;
      border: 1px solid transparent;
      transition: all 0.25s ease;
      text-align: center;
    }

    .btn-primary {
      background-color: var(--accent);
      color: #FFFFFF;
      box-shadow: 0 4px 14px rgba(29, 99, 255, 0.28);
    }

    .btn-primary:hover {
      background-color: var(--accent-hover);
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(29, 99, 255, 0.38);
    }

    .btn-outline {
      background-color: transparent;
      border-color: #CBD5E1;
      color: var(--text-main);
    }

    .btn-outline:hover {
      border-color: var(--accent);
      color: var(--accent);
      background-color: rgba(29, 99, 255, 0.04);
    }

    .btn-amber {
      background-color: var(--amber);
      color: #FFFFFF;
      box-shadow: 0 4px 14px rgba(245, 158, 11, 0.28);
    }

    .btn-amber:hover {
      background-color: #D97706;
      transform: translateY(-2px);
    }

    /* 顶部导航条 */
    .site-header {
      position: sticky;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      transition: all 0.3s ease;
    }

    .top-meta-bar {
      background-color: var(--primary);
      color: #94A3B8;
      font-size: 0.8125rem;
      padding: 6px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }

    .top-meta-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .top-meta-links span {
      margin-right: 20px;
    }

    .top-meta-links span strong {
      color: #F8FAFC;
    }

    .main-nav-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 68px;
    }

    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.45rem;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.5px;
    }

    .brand-logo-icon {
      width: 38px;
      height: 38px;
      background: linear-gradient(135deg, var(--accent), #0F2B48);
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #FFF;
      font-weight: 900;
      font-size: 1.15rem;
      box-shadow: 0 4px 10px rgba(29, 99, 255, 0.25);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 24px;
      list-style: none;
    }

    .nav-links a {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-body);
      padding: 8px 4px;
      position: relative;
    }

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

    .nav-links a::after {
      content: "";
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background-color: var(--accent);
      transition: width 0.25s ease;
    }

    .nav-links a:hover::after, .nav-links a.active::after {
      width: 100%;
    }

    .nav-cta-group {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
      width: 44px;
      height: 44px;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      gap: 5px;
    }

    .mobile-menu-toggle span {
      display: block;
      width: 24px;
      height: 2px;
      background-color: var(--primary);
      transition: 0.3s;
    }

    /* 1. 首屏 Banner */
    .hero-section {
      padding: 60px 0 70px 0;
      background: linear-gradient(180deg, #FFFFFF 0%, #F1F5F9 100%);
      position: relative;
      border-bottom: 1px solid var(--border-color);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.25fr 1fr;
      gap: 48px;
      align-items: center;
    }

    .hero-h1 {
      font-size: 3.125rem;
      font-weight: 900;
      line-height: 1.25;
      color: var(--primary);
      letter-spacing: -1px;
      margin-bottom: 20px;
    }

    .hero-h1 span {
      color: var(--accent);
      background: linear-gradient(90deg, #1D63FF 0%, #0F2B48 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-lead {
      font-size: 1.125rem;
      line-height: 1.85;
      color: var(--text-body);
      margin-bottom: 30px;
    }

    .hero-actions {
      display: flex;
      gap: 16px;
      margin-bottom: 36px;
      flex-wrap: wrap;
    }

    .hero-trust-bar {
      display: flex;
      align-items: center;
      gap: 20px;
      padding-top: 24px;
      border-top: 1px solid var(--border-color);
      font-size: 0.875rem;
      color: var(--text-muted);
    }

    .trust-item {
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .trust-icon {
      color: var(--accent);
      font-weight: 900;
    }

    .hero-card-stage {
      position: relative;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-lg);
      background: #FFFFFF;
      border: 1px solid #CBD5E1;
    }

    .hero-img-wrap {
      position: relative;
      height: 380px;
      overflow: hidden;
    }

    .hero-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .hero-overlay-stats {
      position: absolute;
      bottom: 20px;
      left: 20px;
      right: 20px;
      background: rgba(15, 43, 72, 0.88);
      backdrop-filter: blur(8px);
      border-radius: var(--radius-md);
      padding: 18px 24px;
      display: flex;
      justify-content: space-between;
      color: #FFFFFF;
      border: 1px solid rgba(255, 255, 255, 0.15);
    }

    .stat-badge-num {
      font-size: 1.5rem;
      font-weight: 800;
      color: var(--amber);
      line-height: 1.2;
    }

    .stat-badge-label {
      font-size: 0.8125rem;
      color: #CBD5E1;
    }

    /* 2. 行业痛点与破局对比 */
    .contrast-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }

    .contrast-card {
      padding: 40px;
      border-radius: var(--radius-lg);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
    }

    .contrast-card.traditional {
      background: #FFFFFF;
      border: 1px solid #E2E8F0;
      box-shadow: var(--shadow-sm);
    }

    .contrast-card.modern {
      background: linear-gradient(145deg, #0F2B48 0%, #153a61 100%);
      color: #FFFFFF;
      box-shadow: var(--shadow-md);
    }

    .contrast-card h3 {
      font-size: 1.5rem;
      font-weight: 700;
      margin-bottom: 24px;
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .contrast-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 18px;
    }

    .contrast-list li {
      position: relative;
      padding-left: 32px;
      font-size: 0.98rem;
      line-height: 1.7;
    }

    .contrast-card.traditional li::before {
      content: "✕";
      position: absolute;
      left: 0;
      top: 0;
      color: #EF4444;
      font-weight: 800;
      font-size: 1.1rem;
    }

    .contrast-card.modern li::before {
      content: "✓";
      position: absolute;
      left: 0;
      top: 0;
      color: #10B981;
      font-weight: 800;
      font-size: 1.2rem;
    }

    .contrast-card.modern .text-sub {
      color: #94A3B8;
    }

    /* 3. 平台全景架构与技术合规参数 */
    .arch-grid {
      display: grid;
      grid-template-columns: 1fr 1.1fr;
      gap: 48px;
      align-items: center;
    }

    .arch-spec-box {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-sm);
    }

    .spec-item {
      padding: 16px 0;
      border-bottom: 1px dashed var(--border-color);
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .spec-item:last-child {
      border-bottom: none;
    }

    .spec-title {
      font-weight: 700;
      color: var(--text-main);
      font-size: 1rem;
    }

    .spec-value {
      font-size: 0.95rem;
      color: var(--accent);
      font-weight: 600;
    }

    /* 4. 核心功能与办学优势网格 (2x3 非对称卡片) */
    .adv-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .adv-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 36px 30px;
      transition: all 0.3s ease;
      position: relative;
      display: flex;
      flex-direction: column;
    }

    .adv-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
      border-color: #CBD5E1;
    }

    .adv-card-icon {
      width: 52px;
      height: 52px;
      background: rgba(29, 99, 255, 0.08);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent);
      font-size: 1.4rem;
      margin-bottom: 20px;
      font-weight: 800;
    }

    .adv-card h3 {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 14px;
    }

    .adv-card p {
      font-size: 0.95rem;
      color: var(--text-body);
      line-height: 1.7;
    }

    /* 5. 热门教学产品与场景矩阵 */
    .products-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .product-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }

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

    .product-cover {
      height: 200px;
      position: relative;
      overflow: hidden;
    }

    .product-cover img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }

    .product-card:hover .product-cover img {
      transform: scale(1.04);
    }

    .product-tag {
      position: absolute;
      top: 16px;
      left: 16px;
      background: rgba(15, 43, 72, 0.85);
      color: #FFFFFF;
      font-size: 0.75rem;
      padding: 4px 12px;
      border-radius: var(--radius-pill);
      backdrop-filter: blur(4px);
      font-weight: 600;
    }

    .product-body {
      padding: 28px;
      display: flex;
      flex-direction: column;
      flex-grow: 1;
    }

    .product-body h3 {
      font-size: 1.35rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .product-body p {
      font-size: 0.95rem;
      color: var(--text-body);
      line-height: 1.7;
      margin-bottom: 20px;
    }

    .product-syllabus {
      background: #F8FAFC;
      border-radius: var(--radius-sm);
      padding: 16px;
      margin-bottom: 24px;
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
      font-size: 0.875rem;
      color: var(--text-muted);
    }

    .product-syllabus li {
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .product-syllabus li::before {
      content: "•";
      color: var(--accent);
      font-size: 1.2rem;
    }

    .product-footer {
      margin-top: auto;
      padding-top: 16px;
      border-top: 1px solid var(--border-color);
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    /* 6. 深色教学理念与技术底座 */
    .tech-engine-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .tech-box {
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: var(--radius-md);
      padding: 28px;
      backdrop-filter: blur(6px);
      transition: all 0.3s ease;
    }

    .tech-box:hover {
      background: rgba(255, 255, 255, 0.08);
      border-color: var(--accent);
      transform: translateY(-4px);
    }

    .tech-num {
      font-size: 2.2rem;
      font-weight: 900;
      color: var(--amber);
      margin-bottom: 12px;
      font-family: monospace;
    }

    .tech-box h3 {
      font-size: 1.2rem;
      color: #FFFFFF;
      margin-bottom: 10px;
    }

    .tech-box p {
      font-size: 0.9rem;
      color: #94A3B8;
      line-height: 1.7;
    }

    /* 7. 科学进阶与学习闭环路径 (4步横向轴) */
    .step-roadmap {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      position: relative;
    }

    .step-roadmap::before {
      content: "";
      position: absolute;
      top: 40px;
      left: 12%;
      right: 12%;
      height: 2px;
      background: #E2E8F0;
      z-index: 1;
    }

    .step-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 32px 24px;
      text-align: center;
      position: relative;
      z-index: 2;
      box-shadow: var(--shadow-sm);
    }

    .step-circle {
      width: 54px;
      height: 54px;
      background: #FFFFFF;
      border: 2px solid var(--accent);
      color: var(--accent);
      border-radius: 50%;
      margin: 0 auto 20px auto;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.25rem;
      font-weight: 800;
    }

    .step-card h3 {
      font-size: 1.18rem;
      color: var(--text-main);
      margin-bottom: 10px;
    }

    .step-card p {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 8. 多元角色与全场景适用 */
    .roles-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .role-card {
      background: #FFFFFF;
      border-top: 4px solid var(--accent);
      border-radius: var(--radius-md);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      border-left: 1px solid var(--border-color);
      border-right: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }

    .role-card:nth-child(2) { border-top-color: #10B981; }
    .role-card:nth-child(3) { border-top-color: var(--amber); }
    .role-card:nth-child(4) { border-top-color: #8B5CF6; }

    .role-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 14px;
    }

    .role-card p {
      font-size: 0.92rem;
      color: var(--text-body);
      line-height: 1.7;
    }

    /* 9. 标杆企业与学员突破故事 */
    .story-card-alt {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      overflow: hidden;
      display: grid;
      grid-template-columns: 1fr 1fr;
      margin-bottom: 32px;
      box-shadow: var(--shadow-sm);
    }

    .story-card-alt:last-child {
      margin-bottom: 0;
    }

    .story-card-alt.reverse {
      direction: rtl;
    }

    .story-card-alt.reverse .story-content {
      direction: ltr;
    }

    .story-img-box {
      height: 100%;
      min-height: 320px;
    }

    .story-img-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .story-content {
      padding: 48px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }

    .story-tag {
      font-size: 0.8125rem;
      font-weight: 700;
      color: var(--accent);
      text-transform: uppercase;
      margin-bottom: 12px;
      display: inline-block;
    }

    .story-title {
      font-size: 1.5rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 16px;
      line-height: 1.4;
    }

    .story-desc {
      font-size: 0.95rem;
      color: var(--text-body);
      line-height: 1.75;
      margin-bottom: 24px;
    }

    .story-metrics-badge {
      display: inline-flex;
      align-items: center;
      gap: 12px;
      background: #F1F5F9;
      padding: 10px 18px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 0.9rem;
      color: var(--primary);
    }

    /* 10. 平台效能与量化成果数据条 */
    .metrics-section {
      background: linear-gradient(135deg, var(--primary) 0%, #15395b 100%);
      color: #FFFFFF;
      padding: 64px 0;
    }

    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: center;
    }

    .metric-data-val {
      font-size: 2.85rem;
      font-weight: 900;
      color: var(--amber);
      line-height: 1.1;
      margin-bottom: 8px;
      font-family: monospace;
    }

    .metric-data-label {
      font-size: 1rem;
      color: #E2E8F0;
      font-weight: 600;
      margin-bottom: 4px;
    }

    .metric-data-desc {
      font-size: 0.825rem;
      color: #94A3B8;
    }

    /* 11. 多维客户证言与口碑反馈 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .testimonial-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .quote-stars {
      color: var(--amber);
      font-size: 1.1rem;
      margin-bottom: 14px;
      letter-spacing: 2px;
    }

    .quote-text {
      font-size: 0.95rem;
      line-height: 1.75;
      color: var(--text-body);
      margin-bottom: 24px;
      font-style: italic;
    }

    .quote-author {
      display: flex;
      align-items: center;
      gap: 14px;
      padding-top: 16px;
      border-top: 1px solid var(--border-color);
    }

    .author-avatar {
      width: 46px;
      height: 46px;
      border-radius: 50%;
      background: #E2E8F0;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--primary);
    }

    .author-meta-name {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
    }

    .author-meta-role {
      font-size: 0.8125rem;
      color: var(--text-muted);
    }

    /* 12. 在线教育前沿资讯与动态 */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .news-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }

    .news-img {
      height: 180px;
      overflow: hidden;
    }

    .news-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .news-body {
      padding: 24px;
      display: flex;
      flex-direction: column;
      flex-grow: 1;
    }

    .news-date {
      font-size: 0.8125rem;
      color: var(--text-muted);
      margin-bottom: 8px;
    }

    .news-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-main);
      line-height: 1.45;
      margin-bottom: 12px;
    }

    .news-excerpt {
      font-size: 0.875rem;
      color: var(--text-body);
      line-height: 1.65;
      margin-bottom: 16px;
    }

    .news-link {
      margin-top: auto;
      font-size: 0.875rem;
      font-weight: 700;
      color: var(--accent);
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* 13. 高频答疑与技术支持 FAQ */
    .faq-container {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .faq-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .faq-item details summary {
      padding: 22px 28px;
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-main);
      cursor: pointer;
      list-style: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }

    .faq-item details summary::-webkit-details-marker {
      display: none;
    }

    .faq-item details summary::after {
      content: "+";
      font-size: 1.4rem;
      font-weight: 400;
      color: var(--accent);
      transition: transform 0.25s ease;
    }

    .faq-item details[open] summary::after {
      content: "−";
    }

    .faq-answer {
      padding: 0 28px 24px 28px;
      font-size: 0.95rem;
      line-height: 1.75;
      color: var(--text-body);
      border-top: 1px dashed var(--border-color);
      padding-top: 18px;
    }

    /* 14. 底流转化聚合与极速接入表单 */
    .cta-aggregate-card {
      background: linear-gradient(135deg, #0F2B48 0%, #17385c 100%);
      border-radius: var(--radius-lg);
      padding: 56px 48px;
      color: #FFFFFF;
      box-shadow: var(--shadow-lg);
      display: grid;
      grid-template-columns: 1.2fr 1fr;
      gap: 48px;
      align-items: center;
    }

    .cta-text-side h2 {
      font-size: 2.2rem;
      font-weight: 800;
      line-height: 1.3;
      margin-bottom: 16px;
    }

    .cta-text-side p {
      font-size: 1rem;
      color: #CBD5E1;
      line-height: 1.75;
      margin-bottom: 24px;
    }

    .cta-feature-checklist {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
      font-size: 0.9rem;
      color: #E2E8F0;
    }

    .cta-feature-checklist li {
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .cta-feature-checklist li::before {
      content: "✓";
      color: var(--amber);
      font-weight: 900;
    }

    .cta-form-side {
      background: #FFFFFF;
      padding: 36px;
      border-radius: var(--radius-md);
      color: var(--text-main);
      box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
    }

    .form-group {
      margin-bottom: 18px;
    }

    .form-group label {
      display: block;
      font-size: 0.875rem;
      font-weight: 600;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .form-input {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      background-color: #F8FAFC;
      transition: border-color 0.2s;
    }

    .form-input:focus {
      border-color: var(--accent);
      background-color: #FFFFFF;
    }

    /* 页脚区域 */
    .site-footer {
      background-color: var(--primary-dark);
      color: #94A3B8;
      padding: 72px 0 28px 0;
      font-size: 0.9rem;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
      gap: 40px;
      margin-bottom: 56px;
    }

    .footer-brand h4 {
      font-size: 1.35rem;
      font-weight: 800;
      color: #FFFFFF;
      margin-bottom: 16px;
    }

    .footer-brand p {
      line-height: 1.8;
      margin-bottom: 20px;
    }

    .footer-col h5 {
      font-size: 1.05rem;
      font-weight: 700;
      color: #FFFFFF;
      margin-bottom: 20px;
    }

    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .footer-links a:hover {
      color: #FFFFFF;
    }

    .footer-contact-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
      line-height: 1.6;
    }

    .footer-bottom {
      padding-top: 28px;
      border-top: 1px solid rgba(255, 255, 255, 0.06);
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 0.8125rem;
    }

    .footer-copy {
      color: #64748B;
    }

    .footer-badges {
      display: flex;
      gap: 16px;
    }

    /* 响应式样式断点 */
    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; gap: 40px; }
      .arch-grid { grid-template-columns: 1fr; }
      .adv-grid { grid-template-columns: repeat(2, 1fr); }
      .products-grid { grid-template-columns: repeat(2, 1fr); }
      .tech-engine-grid { grid-template-columns: repeat(2, 1fr); }
      .step-roadmap { grid-template-columns: repeat(2, 1fr); }
      .step-roadmap::before { display: none; }
      .roles-grid { grid-template-columns: repeat(2, 1fr); }
      .story-card-alt { grid-template-columns: 1fr; }
      .story-card-alt.reverse { direction: ltr; }
      .story-card-alt.reverse .story-content { direction: ltr; }
      .metrics-grid { grid-template-columns: repeat(2, 1fr); }
      .testimonial-grid { grid-template-columns: repeat(2, 1fr); }
      .news-grid { grid-template-columns: repeat(2, 1fr); }
      .cta-aggregate-card { grid-template-columns: 1fr; padding: 40px 32px; }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
    }

    @media (max-width: 768px) {
      .top-meta-bar { display: none; }
      .main-nav-inner { height: 60px; }
      .nav-links {
        display: none;
        position: absolute;
        top: 60px;
        left: 0;
        width: 100%;
        background: #FFFFFF;
        flex-direction: column;
        padding: 24px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
        gap: 16px;
      }
      .nav-links.active { display: flex; }
      .mobile-menu-toggle { display: flex; }
      .nav-cta-group .btn { display: none; }
      .section-wrap { padding-top: 56px; padding-bottom: 56px; }
      .hero-h1 { font-size: 2.2rem; }
      .section-title { font-size: 1.75rem; }
      .contrast-grid { grid-template-columns: 1fr; }
      .adv-grid { grid-template-columns: 1fr; }
      .products-grid { grid-template-columns: 1fr; }
      .tech-engine-grid { grid-template-columns: 1fr; }
      .step-roadmap { grid-template-columns: 1fr; }
      .roles-grid { grid-template-columns: 1fr; }
      .metrics-grid { grid-template-columns: 1fr; }
      .testimonial-grid { grid-template-columns: 1fr; }
      .news-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .footer-bottom { flex-direction: column; text-align: center; }
    }