/* roulang page: index */
:root {
      --primary: #0F52BA;
      --primary-dark: #0A387E;
      --primary-light: #EBF2FE;
      --accent: #107C41;
      --accent-orange: #FF6B00;
      --accent-cyan: #0EA5E9;
      --bg-main: #F8FAFC;
      --bg-card: #FFFFFF;
      --bg-dark: #0B132B;
      --text-main: #0F172A;
      --text-body: #334155;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
      --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.08), 0 2px 4px -1px rgba(0,0,0,0.04);
      --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -2px rgba(0,0,0,0.03);
      --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);
      --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-main);
      color: var(--text-body);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }

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

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

    ul, ol {
      list-style: none;
    }

    .container {
      width: 100%;
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }

    /* 顶部通知条 */
    .top-bar {
      background: #091E42;
      color: #94A3B8;
      font-size: 0.8125rem;
      padding: 0.5rem 0;
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 0.5rem;
    }
    .top-bar-meta {
      display: flex;
      gap: 1.25rem;
      align-items: center;
    }
    .top-bar-meta span {
      display: inline-flex;
      align-items: center;
      gap: 0.375rem;
    }

    /* 主导航栏 */
    .header-nav {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .nav-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 4.5rem;
    }
    .logo-brand {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--primary);
    }
    .logo-icon {
      width: 2.25rem;
      height: 2.25rem;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-size: 1.125rem;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 1.75rem;
    }
    .nav-item {
      font-size: 0.9375rem;
      font-weight: 500;
      color: var(--text-main);
      padding: 0.5rem 0.25rem;
      position: relative;
    }
    .nav-item:hover, .nav-item.active {
      color: var(--primary);
    }
    .nav-item::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: var(--transition);
    }
    .nav-item:hover::after, .nav-item.active::after {
      width: 100%;
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 1rem;
    }
    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
    }

    /* 按钮通用 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      padding: 0.75rem 1.5rem;
      font-size: 0.9375rem;
      font-weight: 600;
      border-radius: var(--radius-md);
      cursor: pointer;
      transition: var(--transition);
      border: 1px solid transparent;
      line-height: 1.2;
    }
    .btn-primary {
      background: var(--primary);
      color: #FFFFFF;
      box-shadow: 0 4px 12px rgba(15, 82, 186, 0.25);
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 6px 16px rgba(15, 82, 186, 0.35);
    }
    .btn-outline {
      border-color: var(--border-color);
      background: #FFFFFF;
      color: var(--text-main);
    }
    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: var(--primary-light);
    }
    .btn-accent {
      background: var(--accent-orange);
      color: #FFFFFF;
    }
    .btn-accent:hover {
      background: #E05E00;
      transform: translateY(-2px);
    }
    .btn-sm {
      padding: 0.5rem 1rem;
      font-size: 0.875rem;
    }

    /* Section 通用 */
    .section-wrap {
      padding: 5rem 0;
      position: relative;
    }
    .section-bg-white {
      background-color: #FFFFFF;
    }
    .section-bg-gray {
      background-color: var(--bg-main);
    }
    .section-bg-dark {
      background-color: var(--bg-dark);
      color: #F1F5F9;
    }
    .section-header {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 3.5rem auto;
    }
    .section-tag {
      display: inline-block;
      padding: 0.25rem 0.75rem;
      background: var(--primary-light);
      color: var(--primary);
      border-radius: 999px;
      font-size: 0.8125rem;
      font-weight: 600;
      margin-bottom: 0.75rem;
    }
    .section-tag-dark {
      background: rgba(255, 255, 255, 0.1);
      color: var(--accent-cyan);
    }
    .section-title {
      font-size: 2.125rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 1rem;
      letter-spacing: -0.02em;
    }
    .section-title-dark {
      color: #FFFFFF;
    }
    .section-desc {
      font-size: 1rem;
      color: var(--text-muted);
      line-height: 1.8;
    }
    .section-desc-dark {
      color: #94A3B8;
    }

    /* 1. Hero 开发者/API 规范架构区 */
    .hero-section {
      background: linear-gradient(180deg, #0A192F 0%, #0F172A 100%);
      color: #FFFFFF;
      padding: 5rem 0 6rem 0;
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 3.5rem;
      align-items: center;
    }
    .hero-h1 {
      font-size: 2.75rem;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 1.25rem;
      letter-spacing: -0.02em;
    }
    .hero-h1 span {
      background: linear-gradient(120deg, #38BDF8, #4ADE80);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-sub {
      font-size: 1.0625rem;
      color: #94A3B8;
      margin-bottom: 2rem;
      line-height: 1.8;
    }
    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 1rem;
      margin-bottom: 2.5rem;
    }
    .hero-trust-badges {
      display: flex;
      flex-wrap: wrap;
      gap: 1.5rem;
      border-top: 1px solid rgba(255,255,255,0.1);
      padding-top: 1.5rem;
      font-size: 0.875rem;
      color: #CBD5E1;
    }
    .hero-trust-badges div {
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    .hero-trust-badges i {
      color: #38BDF8;
    }

    /* 代码与数据控制台模拟 */
    .hero-console {
      background: #050B14;
      border: 1px solid rgba(255, 255, 255, 0.12);
      border-radius: var(--radius-lg);
      box-shadow: 0 25px 50px -12px rgba(0,0,0,0.5);
      overflow: hidden;
    }
    .console-header {
      background: #0D1B2A;
      padding: 0.75rem 1rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .console-dots {
      display: flex;
      gap: 0.375rem;
    }
    .console-dot {
      width: 10px;
      height: 10px;
      border-radius: 50%;
    }
    .console-dot:nth-child(1) { background: #EF4444; }
    .console-dot:nth-child(2) { background: #F59E0B; }
    .console-dot:nth-child(3) { background: #10B981; }
    .console-title {
      font-size: 0.75rem;
      font-family: monospace;
      color: #64748B;
    }
    .console-body {
      padding: 1.25rem;
      font-family: Consolas, Monaco, "Courier New", Courier, monospace;
      font-size: 0.8125rem;
      line-height: 1.6;
      color: #E2E8F0;
    }
    .code-comment { color: #64748B; }
    .code-keyword { color: #F472B6; }
    .code-string { color: #34D399; }
    .code-prop { color: #38BDF8; }
    .code-num { color: #FBBF24; }

    /* 2. 片库/列表轨：全周期竞技指标看板区 */
    .tracks-rail {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 1.5rem;
    }
    .track-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .track-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: var(--primary);
    }
    .track-media {
      position: relative;
      height: 180px;
      overflow: hidden;
    }
    .track-media img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.5s ease;
    }
    .track-card:hover .track-media img {
      transform: scale(1.05);
    }
    .track-tag-float {
      position: absolute;
      top: 0.75rem;
      right: 0.75rem;
      background: rgba(15, 23, 42, 0.8);
      backdrop-filter: blur(4px);
      color: #FFFFFF;
      font-size: 0.75rem;
      padding: 0.25rem 0.5rem;
      border-radius: var(--radius-sm);
    }
    .track-body {
      padding: 1.25rem;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }
    .track-title {
      font-size: 1.125rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 0.5rem;
    }
    .track-desc {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 1rem;
      flex-grow: 1;
    }
    .track-foot {
      border-top: 1px solid var(--border-color);
      padding-top: 0.75rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 0.8125rem;
      color: var(--primary);
      font-weight: 600;
    }

    /* 3. 系统架构与技术参数 (#overview) */
    .arch-layout {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3.5rem;
      align-items: center;
    }
    .arch-content h3 {
      font-size: 1.75rem;
      font-weight: 800;
      margin-bottom: 1rem;
      color: var(--text-main);
    }
    .arch-content p {
      margin-bottom: 1.5rem;
      color: var(--text-body);
    }
    .tech-specs {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 1rem;
      margin-top: 1.5rem;
    }
    .spec-item {
      background: var(--bg-main);
      border: 1px solid var(--border-color);
      padding: 1rem;
      border-radius: var(--radius-md);
    }
    .spec-label {
      font-size: 0.75rem;
      color: var(--text-muted);
      margin-bottom: 0.25rem;
    }
    .spec-val {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-main);
    }
    .arch-visual {
      background: linear-gradient(135deg, #1E293B, #0F172A);
      border-radius: var(--radius-lg);
      padding: 2rem;
      color: #FFFFFF;
      position: relative;
      border: 1px solid rgba(255,255,255,0.1);
    }
    .topo-layer {
      background: rgba(255, 255, 255, 0.05);
      border: 1px dashed rgba(255, 255, 255, 0.2);
      border-radius: var(--radius-md);
      padding: 1rem;
      margin-bottom: 1rem;
    }
    .topo-layer:last-child {
      margin-bottom: 0;
    }
    .topo-title {
      font-size: 0.8125rem;
      font-weight: 700;
      color: var(--accent-cyan);
      margin-bottom: 0.5rem;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    .topo-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 0.5rem;
    }
    .topo-badge {
      background: rgba(255, 255, 255, 0.1);
      padding: 0.25rem 0.5rem;
      border-radius: var(--radius-sm);
      font-size: 0.75rem;
    }

    /* 4. 核心功能 6 宫格矩阵 (#advantages) */
    .grid-6 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.75rem;
    }
    .adv-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 2rem;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .adv-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary);
    }
    .adv-icon {
      width: 3.25rem;
      height: 3.25rem;
      border-radius: var(--radius-md);
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.375rem;
      margin-bottom: 1.25rem;
    }
    .adv-title {
      font-size: 1.1875rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 0.75rem;
    }
    .adv-text {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 5. 热门版本服务矩阵 (#modules) */
    .matrix-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    .matrix-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      box-shadow: var(--shadow-sm);
      position: relative;
    }
    .matrix-card.featured {
      border: 2px solid var(--primary);
      box-shadow: var(--shadow-lg);
    }
    .featured-tag {
      position: absolute;
      top: 0;
      right: 1.5rem;
      background: var(--primary);
      color: #fff;
      font-size: 0.75rem;
      font-weight: 700;
      padding: 0.25rem 0.75rem;
      border-bottom-left-radius: var(--radius-sm);
      border-bottom-right-radius: var(--radius-sm);
    }
    .matrix-head {
      padding: 2rem;
      border-bottom: 1px solid var(--border-color);
      background: #FAFAFC;
    }
    .matrix-name {
      font-size: 1.375rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 0.5rem;
    }
    .matrix-subtitle {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.5;
    }
    .matrix-body {
      padding: 2rem;
      flex-grow: 1;
    }
    .matrix-list {
      margin-bottom: 2rem;
    }
    .matrix-list li {
      display: flex;
      align-items: flex-start;
      gap: 0.75rem;
      font-size: 0.875rem;
      color: var(--text-body);
      margin-bottom: 0.875rem;
    }
    .matrix-list li i {
      color: var(--accent);
      margin-top: 0.25rem;
      flex-shrink: 0;
    }
    .matrix-action {
      padding: 0 2rem 2rem 2rem;
    }
    .matrix-action .btn {
      width: 100%;
    }

    /* 6. 深色理念展示区 (#philosophy) */
    .philosophy-banner {
      background: linear-gradient(rgba(11, 19, 43, 0.92), rgba(11, 19, 43, 0.96)), url('/assets/images/2a856aa57f5c0b5f.webp') center/cover no-repeat;
      border-radius: var(--radius-lg);
      padding: 4rem 3rem;
      color: #FFFFFF;
    }
    .philo-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
    }
    .philo-content h3 {
      font-size: 2rem;
      font-weight: 800;
      margin-bottom: 1.25rem;
      line-height: 1.3;
    }
    .philo-content p {
      color: #94A3B8;
      font-size: 0.9375rem;
      line-height: 1.8;
      margin-bottom: 1.5rem;
    }
    .philo-stat-list {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 1.5rem;
    }
    .philo-stat-box {
      background: rgba(255, 255, 255, 0.06);
      border: 1px solid rgba(255, 255, 255, 0.1);
      padding: 1.25rem;
      border-radius: var(--radius-md);
    }
    .philo-stat-num {
      font-size: 1.75rem;
      font-weight: 800;
      color: #38BDF8;
      margin-bottom: 0.25rem;
    }
    .philo-stat-lbl {
      font-size: 0.8125rem;
      color: #CBD5E1;
    }

    /* 7. 实战案例故事 (#cases) */
    .case-stack {
      display: flex;
      flex-direction: column;
      gap: 2.5rem;
    }
    .case-card {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2.5rem;
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      align-items: center;
    }
    .case-card.reverse {
      grid-template-columns: 1fr 1fr;
      direction: rtl;
    }
    .case-card.reverse .case-content {
      direction: ltr;
    }
    .case-card.reverse .case-media {
      direction: ltr;
    }
    .case-media {
      height: 320px;
      overflow: hidden;
    }
    .case-media img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .case-content {
      padding: 2.5rem;
    }
    .case-tag {
      font-size: 0.75rem;
      font-weight: 700;
      color: var(--accent);
      background: #E8F5E9;
      padding: 0.25rem 0.625rem;
      border-radius: var(--radius-sm);
      display: inline-block;
      margin-bottom: 0.75rem;
    }
    .case-title {
      font-size: 1.375rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 1rem;
    }
    .case-desc {
      font-size: 0.875rem;
      color: var(--text-body);
      line-height: 1.7;
      margin-bottom: 1.5rem;
    }
    .case-metrics {
      display: flex;
      gap: 1.5rem;
    }
    .cm-item strong {
      display: block;
      font-size: 1.25rem;
      color: var(--primary);
    }
    .cm-item span {
      font-size: 0.75rem;
      color: var(--text-muted);
    }

    /* 8. 效能数据统计条 (#metrics) */
    .metric-strip {
      background: #0D1B2A;
      border-radius: var(--radius-lg);
      padding: 3rem 2rem;
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 1.5rem;
      text-align: center;
      color: #FFFFFF;
    }
    .metric-col {
      position: relative;
    }
    .metric-col:not(:last-child)::after {
      content: '';
      position: absolute;
      right: 0;
      top: 15%;
      height: 70%;
      width: 1px;
      background: rgba(255, 255, 255, 0.15);
    }
    .metric-val {
      font-size: 2.5rem;
      font-weight: 900;
      color: #38BDF8;
      line-height: 1.1;
      margin-bottom: 0.5rem;
    }
    .metric-name {
      font-size: 0.9375rem;
      font-weight: 600;
      color: #F1F5F9;
      margin-bottom: 0.25rem;
    }
    .metric-hint {
      font-size: 0.75rem;
      color: #94A3B8;
    }

    /* 9. 真实教练与管理层评价 (#reviews) */
    .review-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.75rem;
    }
    .review-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 2rem;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .review-stars {
      color: #F59E0B;
      font-size: 0.875rem;
      margin-bottom: 1rem;
    }
    .review-text {
      font-size: 0.9375rem;
      color: var(--text-body);
      line-height: 1.7;
      margin-bottom: 1.5rem;
    }
    .review-author {
      display: flex;
      align-items: center;
      gap: 0.875rem;
      border-top: 1px solid var(--border-color);
      padding-top: 1rem;
    }
    .author-avatar {
      width: 2.75rem;
      height: 2.75rem;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1rem;
    }
    .author-info h4 {
      font-size: 0.9375rem;
      color: var(--text-main);
      font-weight: 700;
    }
    .author-info p {
      font-size: 0.75rem;
      color: var(--text-muted);
    }

    /* 10. 资讯与行业观察 (#news) */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.75rem;
    }
    .news-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .news-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary);
    }
    .news-media {
      height: 190px;
      overflow: hidden;
    }
    .news-media img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .news-body {
      padding: 1.5rem;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }
    .news-meta {
      font-size: 0.75rem;
      color: var(--text-muted);
      margin-bottom: 0.5rem;
      display: flex;
      justify-content: space-between;
    }
    .news-title {
      font-size: 1.125rem;
      font-weight: 700;
      color: var(--text-main);
      line-height: 1.4;
      margin-bottom: 0.75rem;
    }
    .news-summary {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
      margin-bottom: 1rem;
    }
    .news-link {
      font-size: 0.8125rem;
      color: var(--primary);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 0.375rem;
    }

    /* 11. 部署与数据安全保障 (#security) */
    .sec-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 1.5rem;
    }
    .sec-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 1.75rem;
      text-align: center;
    }
    .sec-icon {
      width: 3rem;
      height: 3rem;
      border-radius: 50%;
      background: #EFF6FF;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.25rem;
      margin: 0 auto 1.25rem auto;
    }
    .sec-title {
      font-size: 1.0625rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 0.5rem;
    }
    .sec-desc {
      font-size: 0.8125rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 12. 快速部署流程指南 (#guide) */
    .steps-row {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 1rem;
      position: relative;
    }
    .step-item {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 1.5rem 1rem;
      text-align: center;
      position: relative;
    }
    .step-num {
      width: 2rem;
      height: 2rem;
      background: var(--primary);
      color: #fff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.875rem;
      font-weight: 700;
      margin: 0 auto 0.75rem auto;
    }
    .step-name {
      font-size: 0.9375rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 0.375rem;
    }
    .step-desc {
      font-size: 0.75rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 13. 高频 FAQ 手风琴 (#faq) */
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      margin-bottom: 1rem;
      overflow: hidden;
      transition: var(--transition);
    }
    .faq-trigger {
      width: 100%;
      text-align: left;
      padding: 1.25rem 1.5rem;
      background: none;
      border: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-size: 1.0625rem;
      font-weight: 700;
      color: var(--text-main);
    }
    .faq-trigger i {
      transition: transform 0.3s ease;
      color: var(--text-muted);
    }
    .faq-content {
      padding: 0 1.5rem 1.25rem 1.5rem;
      display: none;
      font-size: 0.9375rem;
      color: var(--text-body);
      line-height: 1.75;
      border-top: 1px solid var(--border-color);
      padding-top: 1rem;
    }
    .faq-item.active {
      border-color: var(--primary);
      background: #FDFEFE;
    }
    .faq-item.active .faq-trigger i {
      transform: rotate(180deg);
      color: var(--primary);
    }
    .faq-item.active .faq-content {
      display: block;
    }

    /* 14. 转化引导与预约表单 (#contact) */
    .contact-box {
      background: linear-gradient(135deg, #0F52BA, #0A387E);
      border-radius: var(--radius-lg);
      padding: 3.5rem;
      color: #FFFFFF;
      box-shadow: var(--shadow-xl);
    }
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
    }
    .contact-info h3 {
      font-size: 2rem;
      font-weight: 800;
      margin-bottom: 1rem;
    }
    .contact-info p {
      color: #CBD5E1;
      margin-bottom: 2rem;
      line-height: 1.75;
    }
    .contact-perks {
      display: flex;
      flex-direction: column;
      gap: 1rem;
    }
    .perk-row {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      font-size: 0.9375rem;
      color: #E2E8F0;
    }
    .perk-row i {
      color: #38BDF8;
    }
    .contact-form {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      padding: 2.25rem;
      color: var(--text-body);
    }
    .form-group {
      margin-bottom: 1.25rem;
    }
    .form-label {
      display: block;
      font-size: 0.875rem;
      font-weight: 600;
      margin-bottom: 0.375rem;
      color: var(--text-main);
    }
    .form-control {
      width: 100%;
      padding: 0.75rem 1rem;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.9375rem;
      outline: none;
      transition: var(--transition);
    }
    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(15, 82, 186, 0.15);
    }

    /* 页脚 Footer */
    .site-footer {
      background: #0B132B;
      color: #94A3B8;
      padding: 4.5rem 0 2rem 0;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 0.875rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.4fr 0.8fr 0.8fr 1fr;
      gap: 3rem;
      margin-bottom: 3.5rem;
    }
    .footer-brand {
      color: #FFFFFF;
      font-size: 1.25rem;
      font-weight: 800;
      margin-bottom: 1rem;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    .footer-intro {
      line-height: 1.7;
      margin-bottom: 1.5rem;
    }
    .footer-heading {
      color: #FFFFFF;
      font-size: 0.9375rem;
      font-weight: 700;
      margin-bottom: 1.25rem;
    }
    .footer-links li {
      margin-bottom: 0.75rem;
    }
    .footer-links a:hover {
      color: #FFFFFF;
    }
    .footer-contact-item {
      display: flex;
      align-items: flex-start;
      gap: 0.75rem;
      margin-bottom: 0.75rem;
    }
    .footer-contact-item i {
      color: var(--accent-cyan);
      margin-top: 0.25rem;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 2rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 1rem;
      font-size: 0.8125rem;
    }

    /* 移动端与自适应断点 */
    @media (max-width: 1024px) {
      .hero-grid, .arch-layout, .philo-grid, .contact-grid {
        grid-template-columns: 1fr;
        gap: 2.5rem;
      }
      .tracks-rail, .grid-6, .matrix-grid, .review-grid, .news-grid, .sec-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .steps-row {
        grid-template-columns: repeat(3, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .case-card, .case-card.reverse {
        grid-template-columns: 1fr;
      }
      .metric-strip {
        grid-template-columns: repeat(2, 1fr);
      }
      .metric-col:nth-child(2)::after {
        display: none;
      }
    }

    @media (max-width: 768px) {
      .nav-menu, .nav-actions {
        display: none;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .nav-menu.mobile-active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: #FFFFFF;
        padding: 1.5rem;
        box-shadow: var(--shadow-lg);
        border-bottom: 1px solid var(--border-color);
        gap: 1rem;
      }
      .tracks-rail, .grid-6, .matrix-grid, .review-grid, .news-grid, .sec-grid, .steps-row {
        grid-template-columns: 1fr;
      }
      .metric-strip {
        grid-template-columns: 1fr;
        gap: 2rem;
      }
      .metric-col::after {
        display: none !important;
      }
      .footer-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
      }
      .hero-h1 {
        font-size: 2rem;
      }
      .section-title {
        font-size: 1.625rem;
      }
      .contact-box {
        padding: 2rem 1.5rem;
      }
    }