/* roulang page: index */
:root {
      --primary: #0A2540;
      --primary-dark: #071524;
      --accent: #008080;
      --accent-hover: #00A389;
      --highlight: #F59E0B;
      --bg-light: #F8FAFC;
      --bg-white: #FFFFFF;
      --border-color: #E2E8F0;
      --border-dark: #1E293B;
      --text-main: #0F172A;
      --text-muted: #334155;
      --text-light: #64748B;
      --card-radius: 6px;
      --btn-radius: 4px;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
      --shadow-md: 0 4px 20px rgba(10,37,64,0.06);
      --shadow-lg: 0 12px 32px rgba(10,37,64,0.12);
      --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    }

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

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

    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      color: var(--text-muted);
      background-color: var(--bg-light);
      line-height: 1.7;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

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

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

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

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 顶部服务条 */
    .top-bar {
      background: var(--primary-dark);
      color: #94A3B8;
      font-size: 13px;
      border-bottom: 1px solid rgba(255,255,255,0.08);
      padding: 6px 0;
    }
    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .top-links {
      display: flex;
      gap: 20px;
    }
    .top-links a:hover {
      color: #FFFFFF;
    }

    /* 主导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 999;
      background: rgba(255, 255, 255, 0.98);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 10px rgba(0,0,0,0.02);
    }
    .nav-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 72px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 20px;
      font-weight: 700;
      color: var(--primary);
    }
    .brand-icon {
      width: 32px;
      height: 32px;
      background: var(--primary);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 4px;
      font-size: 14px;
      font-weight: 800;
      border: 1px solid var(--accent);
    }
    .nav-menu {
      display: flex;
      gap: 28px;
      list-style: none;
    }
    .nav-menu a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-main);
      padding: 6px 0;
      position: relative;
    }
    .nav-menu a:hover {
      color: var(--accent);
    }
    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width 0.2s;
    }
    .nav-menu a:hover::after {
      width: 100%;
    }
    .nav-cta {
      background: var(--accent);
      color: #fff;
      padding: 9px 20px;
      border-radius: var(--btn-radius);
      font-size: 14px;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .nav-cta:hover {
      background: var(--accent-hover);
      color: #fff;
    }

    /* 移动端菜单按钮 */
    .menu-toggle {
      display: none;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 6px;
    }
    .menu-toggle span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--primary);
      margin: 5px 0;
      transition: var(--transition);
    }

    /* 基础通用板块样式 */
    section {
      padding: 84px 0;
    }
    .section-title-wrap {
      margin-bottom: 52px;
      max-width: 820px;
    }
    .section-tag {
      display: inline-block;
      font-size: 12px;
      font-weight: 700;
      letter-spacing: 1px;
      text-transform: uppercase;
      color: var(--accent);
      background: rgba(0,128,128,0.08);
      padding: 4px 12px;
      border-radius: 4px;
      margin-bottom: 12px;
      border-left: 3px solid var(--accent);
    }
    .section-tag-dark {
      background: rgba(0,163,137,0.15);
      color: #34D399;
      border-left-color: #34D399;
    }
    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.35;
      margin-bottom: 16px;
    }
    .section-title-dark {
      color: #FFFFFF;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.8;
    }
    .section-desc-dark {
      color: #94A3B8;
    }

    /* 按钮系统 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 12px 24px;
      font-size: 15px;
      font-weight: 600;
      border-radius: var(--btn-radius);
      cursor: pointer;
      transition: var(--transition);
      border: 1px solid transparent;
      line-height: 1.4;
      min-height: 46px;
    }
    .btn-primary {
      background: var(--accent);
      color: #FFFFFF;
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      box-shadow: 0 4px 14px rgba(0,128,128,0.25);
    }
    .btn-outline {
      background: transparent;
      border-color: var(--border-color);
      color: var(--text-main);
    }
    .btn-outline:hover {
      border-color: var(--accent);
      color: var(--accent);
      background: #FFFFFF;
    }
    .btn-outline-white {
      border-color: rgba(255,255,255,0.25);
      color: #FFFFFF;
    }
    .btn-outline-white:hover {
      border-color: #FFFFFF;
      background: rgba(255,255,255,0.06);
    }

    /* 1. 首屏展示区 */
    #hero {
      position: relative;
      background-color: var(--primary-dark);
      background-image: linear-gradient(rgba(7, 21, 36, 0.94), rgba(7, 21, 36, 0.92)), url('/assets/images/1994c89daa896c66.webp');
      background-size: cover;
      background-position: center;
      padding: 100px 0 110px;
      border-bottom: 1px solid var(--border-dark);
      color: #FFFFFF;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 56px;
      align-items: center;
    }
    .hero-badge-top {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      font-size: 13px;
      background: rgba(255,255,255,0.08);
      border: 1px solid rgba(255,255,255,0.15);
      padding: 6px 14px;
      border-radius: 20px;
      margin-bottom: 24px;
    }
    .hero-badge-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: #10B981;
      box-shadow: 0 0 8px #10B981;
    }
    .hero-h1 {
      font-size: 42px;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 20px;
      color: #FFFFFF;
      letter-spacing: -0.5px;
    }
    .hero-h1 span {
      color: #00A389;
    }
    .hero-desc {
      font-size: 16px;
      line-height: 1.85;
      color: #CBD5E1;
      margin-bottom: 34px;
      text-align: justify;
    }
    .hero-cta-group {
      display: flex;
      gap: 16px;
      margin-bottom: 36px;
    }
    .hero-spec-list {
      display: flex;
      flex-wrap: wrap;
      gap: 20px;
      padding-top: 24px;
      border-top: 1px solid rgba(255,255,255,0.12);
      font-size: 13px;
      color: #94A3B8;
    }
    .hero-spec-item strong {
      color: #FFFFFF;
      display: block;
      font-size: 15px;
    }
    .hero-display-stage {
      background: rgba(15, 23, 42, 0.7);
      border: 1px solid rgba(255,255,255,0.12);
      border-radius: var(--card-radius);
      padding: 16px;
      box-shadow: var(--shadow-lg);
      position: relative;
    }
    .stage-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      border-bottom: 1px solid rgba(255,255,255,0.08);
      padding-bottom: 12px;
      margin-bottom: 14px;
      font-size: 12px;
      color: #94A3B8;
      font-family: monospace;
    }
    .stage-img-wrap {
      position: relative;
      border-radius: 4px;
      overflow: hidden;
      border: 1px solid rgba(255,255,255,0.08);
    }
    .stage-img-wrap img {
      width: 100%;
      height: 320px;
      object-fit: cover;
    }
    .stage-status-bar {
      margin-top: 14px;
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 10px;
      text-align: center;
    }
    .status-tile {
      background: rgba(255,255,255,0.04);
      padding: 8px;
      border-radius: 4px;
      border: 1px solid rgba(255,255,255,0.06);
    }
    .status-tile span {
      display: block;
      font-size: 11px;
      color: #94A3B8;
    }
    .status-tile strong {
      font-size: 14px;
      color: #38BDF8;
      font-family: monospace;
    }

    /* 2. 行业痛点区 */
    #painpoints {
      background: var(--bg-white);
      border-bottom: 1px solid var(--border-color);
    }
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .pain-card {
      background: #FFFFFF;
      border: 1px solid #F1F5F9;
      border-top: 3px solid #EF4444;
      padding: 26px 20px;
      border-radius: var(--card-radius);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .pain-card:hover {
      transform: translateY(-2px);
      box-shadow: var(--shadow-md);
      border-color: #CBD5E1;
      border-top-color: #DC2626;
    }
    .pain-badge {
      align-self: flex-start;
      font-size: 11px;
      font-weight: 700;
      color: #B91C1C;
      background: #FEF2F2;
      padding: 3px 8px;
      border-radius: 3px;
      margin-bottom: 14px;
    }
    .pain-title {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
      line-height: 1.4;
    }
    .pain-body {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 3. 架构方案区 */
    #solutions {
      background: var(--bg-light);
      border-bottom: 1px solid var(--border-color);
    }
    .solutions-layout {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .arch-layers {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .arch-layer-box {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--card-radius);
      padding: 22px;
      box-shadow: var(--shadow-sm);
      position: relative;
      border-left: 4px solid var(--accent);
      transition: var(--transition);
    }
    .arch-layer-box:hover {
      border-color: var(--accent);
      border-left-width: 6px;
      box-shadow: var(--shadow-md);
    }
    .layer-tag {
      font-size: 12px;
      font-weight: 700;
      color: var(--accent);
      text-transform: uppercase;
      margin-bottom: 6px;
    }
    .layer-title {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }
    .layer-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }
    .standards-pill-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 14px;
    }
    .pill {
      font-size: 11px;
      background: #F1F5F9;
      color: #475569;
      padding: 2px 8px;
      border-radius: 3px;
      font-weight: 600;
    }

    /* 4. 优势矩阵区 */
    #advantages {
      background: var(--bg-white);
      border-bottom: 1px solid var(--border-color);
    }
    .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(--card-radius);
      padding: 28px 24px;
      transition: var(--transition);
      position: relative;
    }
    .adv-card:hover {
      border-color: var(--accent);
      transform: translateY(-2px);
      box-shadow: var(--shadow-md);
    }
    .adv-icon-badge {
      width: 44px;
      height: 44px;
      background: rgba(0, 128, 128, 0.08);
      border: 1px solid rgba(0, 128, 128, 0.15);
      border-radius: 4px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent);
      font-weight: 800;
      font-size: 18px;
      margin-bottom: 20px;
    }
    .adv-card h3 {
      font-size: 19px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }
    .adv-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 5. 产品矩阵区 */
    #products {
      background: var(--bg-light);
      border-bottom: 1px solid var(--border-color);
    }
    .prod-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .prod-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--card-radius);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      transition: var(--transition);
    }
    .prod-card:hover {
      border-color: var(--accent);
      box-shadow: var(--shadow-md);
      transform: translateY(-3px);
    }
    .prod-card-thumb {
      height: 190px;
      position: relative;
      overflow: hidden;
      background: #E2E8F0;
    }
    .prod-card-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.3s ease;
    }
    .prod-card:hover .prod-card-thumb img {
      transform: scale(1.03);
    }
    .prod-content {
      padding: 24px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }
    .prod-tag-row {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
      margin-bottom: 12px;
    }
    .prod-tag {
      font-size: 11px;
      padding: 2px 7px;
      background: rgba(10,37,64,0.06);
      color: var(--primary);
      border-radius: 3px;
      font-weight: 600;
    }
    .prod-card h3 {
      font-size: 20px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }
    .prod-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 18px;
      flex-grow: 1;
    }
    .prod-features {
      list-style: none;
      border-top: 1px solid #F1F5F9;
      padding-top: 14px;
      margin-bottom: 18px;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    .prod-features li {
      font-size: 13px;
      color: #475569;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .prod-features li::before {
      content: '■';
      color: var(--accent);
      font-size: 8px;
    }

    /* 6. 实施方法与部署流程 */
    #methodology {
      background: var(--bg-white);
      border-bottom: 1px solid var(--border-color);
    }
    .flow-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .step-card {
      background: #F8FAFC;
      border: 1px solid var(--border-color);
      border-radius: var(--card-radius);
      padding: 24px 20px;
      position: relative;
    }
    .step-number {
      font-size: 26px;
      font-weight: 900;
      color: var(--accent);
      font-family: monospace;
      margin-bottom: 8px;
    }
    .step-card h3 {
      font-size: 17px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }
    .step-card p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 7. 底层理念与自研内核（深色） */
    #philosophy {
      background-color: var(--primary-dark);
      background-image: radial-gradient(#1E293B 1px, transparent 1px);
      background-size: 24px 24px;
      color: #FFFFFF;
      border-bottom: 1px solid var(--border-dark);
    }
    .philo-hero-box {
      border: 1px solid rgba(255,255,255,0.12);
      border-radius: var(--card-radius);
      padding: 44px;
      background: rgba(10, 37, 64, 0.6);
      backdrop-filter: blur(10px);
    }
    .philo-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 40px;
      align-items: center;
    }
    .philo-body h3 {
      font-size: 24px;
      font-weight: 800;
      color: #FFFFFF;
      margin-bottom: 18px;
    }
    .philo-body p {
      font-size: 15px;
      color: #CBD5E1;
      line-height: 1.8;
      margin-bottom: 24px;
    }
    .philo-stats {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
    }
    .philo-stat-item {
      background: rgba(255,255,255,0.04);
      border: 1px solid rgba(255,255,255,0.08);
      border-radius: 4px;
      padding: 16px;
    }
    .philo-stat-item strong {
      display: block;
      font-size: 22px;
      font-weight: 800;
      color: #38BDF8;
      font-family: monospace;
    }
    .philo-stat-item span {
      font-size: 12px;
      color: #94A3B8;
    }

    /* 8. 工程案例与验证场景 */
    #cases {
      background: var(--bg-white);
      border-bottom: 1px solid var(--border-color);
    }
    .case-container {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--card-radius);
      overflow: hidden;
      display: grid;
      grid-template-columns: 1fr 1fr;
    }
    .case-media {
      height: 100%;
      min-height: 380px;
      background: #E2E8F0;
    }
    .case-media img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .case-detail {
      padding: 44px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .case-badge {
      display: inline-block;
      font-size: 12px;
      color: var(--accent);
      font-weight: 700;
      margin-bottom: 12px;
    }
    .case-title {
      font-size: 24px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 16px;
      line-height: 1.4;
    }
    .case-desc {
      font-size: 15px;
      color: var(--text-muted);
      line-height: 1.75;
      margin-bottom: 24px;
    }
    .case-metrics-row {
      display: flex;
      gap: 32px;
      border-top: 1px solid #F1F5F9;
      padding-top: 20px;
    }
    .case-metric-item strong {
      display: block;
      font-size: 24px;
      font-weight: 800;
      color: var(--primary);
      font-family: monospace;
    }
    .case-metric-item span {
      font-size: 13px;
      color: var(--text-light);
    }

    /* 9. 关键成效指标量化条 */
    #metrics {
      background: #0F172A;
      color: #FFFFFF;
      padding: 56px 0;
      border-bottom: 1px solid var(--border-dark);
    }
    .metrics-bar-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: center;
    }
    .metric-col {
      padding: 12px;
      position: relative;
    }
    .metric-col:not(:last-child)::after {
      content: '';
      position: absolute;
      right: 0;
      top: 20%;
      height: 60%;
      width: 1px;
      background: rgba(255,255,255,0.12);
    }
    .metric-val {
      font-size: 44px;
      font-weight: 900;
      color: #38BDF8;
      font-family: monospace;
      line-height: 1.1;
      margin-bottom: 8px;
    }
    .metric-label {
      font-size: 15px;
      color: #E2E8F0;
      font-weight: 600;
      margin-bottom: 4px;
    }
    .metric-sub {
      font-size: 12px;
      color: #94A3B8;
    }

    /* 10. 客户证言区 */
    #testimonials {
      background: var(--bg-light);
      border-bottom: 1px solid var(--border-color);
    }
    .testi-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .testi-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--card-radius);
      padding: 30px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .testi-card:hover {
      border-color: var(--accent);
      box-shadow: var(--shadow-md);
    }
    .testi-quote {
      font-size: 14px;
      line-height: 1.8;
      color: var(--text-muted);
      margin-bottom: 24px;
      position: relative;
    }
    .testi-quote::before {
      content: '“';
      font-size: 40px;
      line-height: 1;
      color: var(--accent);
      opacity: 0.3;
      display: block;
      margin-bottom: 6px;
      font-family: serif;
    }
    .testi-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #F1F5F9;
      padding-top: 16px;
    }
    .author-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: var(--primary);
      color: #FFFFFF;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 14px;
      font-weight: 700;
    }
    .author-meta strong {
      display: block;
      font-size: 14px;
      color: var(--text-main);
    }
    .author-meta span {
      font-size: 12px;
      color: var(--text-light);
    }

    /* 11. 前沿资讯与白皮书 */
    #news {
      background: var(--bg-white);
      border-bottom: 1px solid var(--border-color);
    }
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .news-card {
      border: 1px solid var(--border-color);
      border-radius: var(--card-radius);
      padding: 26px;
      background: #FFFFFF;
      transition: var(--transition);
      cursor: pointer;
    }
    .news-card:hover {
      border-color: var(--accent);
      transform: translateY(-2px);
      box-shadow: var(--shadow-sm);
    }
    .news-date {
      font-size: 12px;
      color: var(--accent);
      font-weight: 700;
      margin-bottom: 10px;
      display: block;
      font-family: monospace;
    }
    .news-title {
      font-size: 17px;
      font-weight: 700;
      color: var(--text-main);
      line-height: 1.45;
      margin-bottom: 12px;
    }
    .news-card p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 12. 生态兼容与国际标准 */
    #ecosystem {
      background: var(--bg-light);
      border-bottom: 1px solid var(--border-color);
    }
    .eco-layout {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .eco-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .eco-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--card-radius);
      padding: 18px 22px;
      display: flex;
      gap: 16px;
    }
    .eco-dot {
      width: 12px;
      height: 12px;
      border-radius: 50%;
      background: var(--accent);
      margin-top: 6px;
      flex-shrink: 0;
    }
    .eco-item-text strong {
      display: block;
      font-size: 16px;
      color: var(--text-main);
      margin-bottom: 4px;
    }
    .eco-item-text p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }
    .eco-standards-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 14px;
    }
    .standard-chip {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: 4px;
      padding: 16px;
      text-align: center;
    }
    .standard-chip code {
      font-size: 16px;
      font-weight: 700;
      color: var(--primary);
      display: block;
      margin-bottom: 4px;
    }
    .standard-chip span {
      font-size: 12px;
      color: var(--text-light);
    }

    /* 13. FAQ 常见问题 */
    #faq {
      background: var(--bg-white);
      border-bottom: 1px solid var(--border-color);
    }
    .faq-wrapper {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .faq-item {
      border: 1px solid var(--border-color);
      border-radius: var(--card-radius);
      background: #FFFFFF;
      overflow: hidden;
      transition: var(--transition);
    }
    .faq-item[open] {
      border-color: var(--accent);
      box-shadow: var(--shadow-sm);
    }
    .faq-item 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;
      user-select: none;
    }
    .faq-item summary::-webkit-details-marker {
      display: none;
    }
    .faq-item summary::after {
      content: '+';
      font-size: 20px;
      font-weight: 400;
      color: var(--accent);
      transition: transform 0.2s ease;
    }
    .faq-item[open] summary::after {
      content: '−';
    }
    .faq-answer {
      padding: 0 24px 22px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.8;
      border-top: 1px solid #F1F5F9;
      padding-top: 16px;
    }

    /* 14. 转化引导区 */
    #cta-banner {
      background-color: var(--primary);
      background-image: linear-gradient(135deg, #0A2540 0%, #071524 100%);
      color: #FFFFFF;
      padding: 80px 0;
    }
    .cta-panel {
      border: 1px solid rgba(255,255,255,0.15);
      border-radius: var(--card-radius);
      padding: 48px;
      background: rgba(255,255,255,0.02);
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 48px;
      align-items: center;
    }
    .cta-content h2 {
      font-size: 30px;
      font-weight: 800;
      color: #FFFFFF;
      margin-bottom: 16px;
      line-height: 1.35;
    }
    .cta-content p {
      font-size: 15px;
      color: #CBD5E1;
      line-height: 1.8;
      margin-bottom: 24px;
    }
    .cta-form {
      display: flex;
      flex-direction: column;
      gap: 14px;
      background: #FFFFFF;
      padding: 28px;
      border-radius: var(--card-radius);
      color: var(--text-main);
      box-shadow: var(--shadow-lg);
    }
    .form-group label {
      display: block;
      font-size: 13px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 6px;
    }
    .form-input {
      width: 100%;
      height: 42px;
      border: 1px solid var(--border-color);
      border-radius: var(--btn-radius);
      padding: 0 12px;
      font-size: 14px;
      color: var(--text-main);
      background: #F8FAFC;
    }
    .form-input:focus {
      border-color: var(--accent);
      background: #FFFFFF;
    }

    /* 全局页脚 */
    .site-footer {
      background: #050E17;
      color: #94A3B8;
      padding: 70px 0 30px;
      border-top: 1px solid rgba(255,255,255,0.08);
      font-size: 14px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.4fr 0.8fr 0.8fr 1fr;
      gap: 40px;
      margin-bottom: 50px;
    }
    .footer-brand-title {
      font-size: 20px;
      font-weight: 800;
      color: #FFFFFF;
      margin-bottom: 14px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .footer-brand-desc {
      font-size: 13px;
      line-height: 1.8;
      color: #64748B;
      margin-bottom: 20px;
    }
    .footer-col h4 {
      font-size: 15px;
      font-weight: 700;
      color: #FFFFFF;
      margin-bottom: 18px;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-links a {
      color: #94A3B8;
      font-size: 13px;
    }
    .footer-links a:hover {
      color: #38BDF8;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.06);
      padding-top: 28px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 12px;
      color: #475569;
    }

    /* 响应式断点系统 */
    @media (max-width: 1024px) {
      .hero-grid,
      .solutions-layout,
      .philo-grid,
      .case-container,
      .eco-layout,
      .cta-panel {
        grid-template-columns: 1fr;
        gap: 36px;
      }
      .pain-grid,
      .adv-grid,
      .prod-grid,
      .flow-steps,
      .metrics-bar-grid,
      .testi-grid,
      .news-grid,
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .metric-col:not(:last-child)::after {
        display: none;
      }
      .case-media {
        min-height: 280px;
      }
    }

    @media (max-width: 768px) {
      .top-bar {
        display: none;
      }
      .menu-toggle {
        display: block;
      }
      .nav-menu {
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #FFFFFF;
        flex-direction: column;
        padding: 20px 24px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
        display: none;
      }
      .nav-menu.active {
        display: flex;
      }
      .hero-h1 {
        font-size: 30px;
      }
      .pain-grid,
      .adv-grid,
      .prod-grid,
      .flow-steps,
      .metrics-bar-grid,
      .testi-grid,
      .news-grid,
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero-cta-group {
        flex-direction: column;
      }
      .cta-panel {
        padding: 24px;
      }
      .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
      }
      section {
        padding: 56px 0;
      }
      .section-title {
        font-size: 26px;
      }
    }