/* roulang page: index */
:root {
      --primary: #059669;
      --primary-hover: #047857;
      --primary-light: #10b981;
      --primary-gradient: linear-gradient(135deg, #10b981 0%, #047857 100%);
      --accent: #f97316;
      --accent-hover: #ea580c;
      --accent-gradient: linear-gradient(135deg, #fb923c 0%, #ea580c 100%);
      --bg-main: #f8fafc;
      --bg-white: #ffffff;
      --bg-dark: #0f172a;
      --bg-dark-surface: #1e293b;
      --border-color: #e2e8f0;
      --border-dark: #334155;
      --text-main: #0f172a;
      --text-muted: #64748b;
      --text-light: #ffffff;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 22px;
      --radius-pill: 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-card: 0 16px 32px -4px rgba(15, 23, 42, 0.06);
      --shadow-dark: 0 20px 35px -5px rgba(0, 0, 0, 0.4);
      --container-max: 1240px;
      --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

    /* 基础重置 */
    *, *::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-main);
      line-height: 1.6;
      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: inherit;
    }
    ul, ol {
      list-style: none;
    }

    /* 布局容器 */
    .container {
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 1.5rem;
    }
    .section-spacing {
      padding: 5.5rem 0;
    }
    .section-spacing-sm {
      padding: 3.5rem 0;
    }

    /* 辅助顶条 */
    .top-bar {
      background: #091120;
      color: #94a3b8;
      font-size: 0.8125rem;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      position: relative;
      z-index: 101;
    }
    .top-bar-content {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 0.5rem 1.5rem;
      max-width: var(--container-max);
      margin: 0 auto;
    }
    .top-bar-left, .top-bar-right {
      display: flex;
      align-items: center;
      gap: 1.5rem;
    }
    .top-bar-item {
      display: inline-flex;
      align-items: center;
      gap: 0.4rem;
    }
    .pulse-dot {
      width: 7px;
      height: 7px;
      border-radius: 50%;
      background-color: #10b981;
      box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
      animation: pulse 2s infinite;
    }
    @keyframes pulse {
      0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
      70% { transform: scale(1); box-shadow: 0 0 0 6px rgba(16, 185, 129, 0); }
      100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      z-index: 100;
      transition: var(--transition);
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 0.85rem 1.5rem;
      max-width: var(--container-max);
      margin: 0 auto;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 0.75rem;
    }
    .brand-icon {
      width: 42px;
      height: 42px;
      background: var(--primary-gradient);
      border-radius: var(--radius-md);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-weight: 800;
      font-size: 1.25rem;
      box-shadow: 0 4px 12px rgba(5, 150, 105, 0.3);
    }
    .brand-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-main);
      line-height: 1.2;
    }
    .brand-sub {
      font-size: 0.75rem;
      color: var(--text-muted);
      font-weight: 500;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 1.5rem;
    }
    .nav-link {
      font-size: 0.925rem;
      font-weight: 500;
      color: var(--text-main);
      padding: 0.5rem 0.25rem;
      position: relative;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--primary);
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: var(--transition);
    }
    .nav-link:hover::after, .nav-link.active::after {
      width: 100%;
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 1rem;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 0.75rem 1.6rem;
      border-radius: var(--radius-pill);
      font-weight: 600;
      font-size: 0.95rem;
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      text-align: center;
    }
    .btn-primary {
      background: var(--primary-gradient);
      color: #fff;
      box-shadow: 0 4px 14px rgba(5, 150, 105, 0.28);
    }
    .btn-primary:hover {
      background: linear-gradient(135deg, #059669 0%, #047857 100%);
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(5, 150, 105, 0.38);
    }
    .btn-accent {
      background: var(--accent-gradient);
      color: #fff;
      box-shadow: 0 4px 14px rgba(249, 115, 22, 0.3);
    }
    .btn-accent:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(249, 115, 22, 0.4);
    }
    .btn-outline {
      border-color: rgba(255, 255, 255, 0.25);
      color: #fff;
      background: rgba(255, 255, 255, 0.06);
    }
    .btn-outline:hover {
      background: rgba(255, 255, 255, 0.15);
      border-color: #fff;
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
      padding: 0.25rem;
    }

    /* 视觉标签与徽章 */
    .badge-pill {
      display: inline-flex;
      align-items: center;
      gap: 0.45rem;
      padding: 0.35rem 0.95rem;
      border-radius: var(--radius-pill);
      font-size: 0.8125rem;
      font-weight: 600;
      background: rgba(16, 185, 129, 0.1);
      color: var(--primary);
      border: 1px solid rgba(16, 185, 129, 0.25);
    }
    .badge-dark {
      background: rgba(255, 255, 255, 0.08);
      color: #a7f3d0;
      border: 1px solid rgba(16, 185, 129, 0.3);
    }

    /* 标题统一样式 */
    .section-head {
      text-align: center;
      max-width: 820px;
      margin: 0 auto 3.5rem auto;
    }
    .section-head.text-left {
      text-align: left;
      margin-left: 0;
    }
    .section-subtitle {
      font-size: 0.875rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.08em;
      color: var(--primary);
      margin-bottom: 0.75rem;
      display: block;
    }
    .section-title {
      font-size: 2.15rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.3;
      margin-bottom: 1rem;
    }
    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 1. 首屏工业参数区 (#banner) */
    .hero-section {
      position: relative;
      background: linear-gradient(rgba(15, 23, 42, 0.86), rgba(15, 23, 42, 0.94)), url('/assets/images/853d93d8aaec55cd.jpg') center/cover no-repeat;
      color: var(--text-light);
      padding: 5rem 0 4rem;
      border-bottom: 1px solid var(--border-dark);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 3.5rem;
      align-items: center;
    }
    .hero-content h1 {
      font-size: 2.85rem;
      font-weight: 900;
      line-height: 1.25;
      margin: 1.25rem 0;
      letter-spacing: -0.02em;
    }
    .hero-content h1 span {
      background: linear-gradient(120deg, #34d399, #6ee7b7);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-summary {
      font-size: 1.05rem;
      color: #cbd5e1;
      line-height: 1.75;
      margin-bottom: 2rem;
    }
    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 1rem;
      margin-bottom: 2.5rem;
    }
    .hero-specs-row {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.25rem;
      padding-top: 2rem;
      border-top: 1px solid rgba(255, 255, 255, 0.12);
    }
    .hero-spec-item strong {
      display: block;
      font-size: 1.75rem;
      font-weight: 800;
      color: #34d399;
      font-family: monospace, sans-serif;
    }
    .hero-spec-item span {
      font-size: 0.8125rem;
      color: #94a3b8;
    }
    .hero-card-panel {
      background: rgba(30, 41, 59, 0.75);
      border: 1px solid rgba(255, 255, 255, 0.12);
      border-radius: var(--radius-lg);
      padding: 2rem;
      backdrop-filter: blur(10px);
      box-shadow: var(--shadow-dark);
    }
    .hero-panel-head {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 1.5rem;
      padding-bottom: 1rem;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .hero-telemetry-item {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 0.85rem 0;
      border-bottom: 1px dashed rgba(255, 255, 255, 0.08);
      font-size: 0.9rem;
    }
    .hero-telemetry-item:last-child {
      border-bottom: none;
    }
    .telemetry-val {
      color: #38bdf8;
      font-weight: 700;
      font-family: monospace;
    }

    /* 2. 品牌工程底座介绍 (#intro) */
    .intro-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3.5rem;
      align-items: center;
    }
    .intro-image-wrap {
      position: relative;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      border: 1px solid var(--border-color);
    }
    .intro-features-list {
      margin-top: 1.75rem;
      display: grid;
      grid-template-columns: 1fr;
      gap: 1.25rem;
    }
    .intro-feature-box {
      display: flex;
      gap: 1rem;
      background: #fff;
      padding: 1.25rem;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .feature-icon-badge {
      width: 44px;
      height: 44px;
      border-radius: 12px;
      background: rgba(16, 185, 129, 0.12);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 1.2rem;
      flex-shrink: 0;
    }

    /* 3. 核心优势六联排 (#advantages) */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.75rem;
    }
    .adv-card {
      background: #fff;
      border-radius: var(--radius-lg);
      padding: 2.25rem 1.75rem;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-card);
      position: relative;
      transition: var(--transition);
      overflow: hidden;
    }
    .adv-card:hover {
      transform: translateY(-5px);
      border-color: rgba(16, 185, 129, 0.4);
      box-shadow: 0 20px 30px -10px rgba(5, 150, 105, 0.15);
    }
    .adv-card-indicator {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 4px;
      background: var(--primary-gradient);
      opacity: 0;
      transition: var(--transition);
    }
    .adv-card:hover .adv-card-indicator {
      opacity: 1;
    }
    .adv-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 1.25rem;
    }
    .adv-num {
      font-size: 1.75rem;
      font-weight: 900;
      color: #e2e8f0;
      font-family: monospace;
    }
    .adv-card h3 {
      font-size: 1.25rem;
      margin-bottom: 0.85rem;
      color: var(--text-main);
    }
    .adv-card p {
      color: var(--text-muted);
      font-size: 0.925rem;
      line-height: 1.65;
    }

    /* 4. 热门产品体系展厅 (#products) */
    .products-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    .product-card {
      background: #fff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-card);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      transition: var(--transition);
    }
    .product-card:hover {
      transform: translateY(-6px);
      box-shadow: 0 22px 36px -8px rgba(15, 23, 42, 0.12);
    }
    .product-media {
      position: relative;
      height: 220px;
      overflow: hidden;
      background: #e2e8f0;
    }
    .product-media img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.5s ease;
    }
    .product-card:hover .product-media img {
      transform: scale(1.05);
    }
    .product-tag {
      position: absolute;
      top: 1rem;
      right: 1rem;
      background: rgba(15, 23, 42, 0.85);
      color: #fff;
      font-size: 0.75rem;
      font-weight: 600;
      padding: 0.35rem 0.75rem;
      border-radius: var(--radius-pill);
      backdrop-filter: blur(4px);
    }
    .product-body {
      padding: 1.75rem;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }
    .product-body h3 {
      font-size: 1.3rem;
      font-weight: 700;
      margin-bottom: 0.75rem;
    }
    .product-body p {
      font-size: 0.925rem;
      color: var(--text-muted);
      margin-bottom: 1.25rem;
      line-height: 1.6;
    }
    .product-features-mini {
      margin-top: auto;
      padding-top: 1rem;
      border-top: 1px solid var(--border-color);
      display: flex;
      flex-wrap: wrap;
      gap: 0.5rem;
    }
    .tag-sm {
      background: #f1f5f9;
      color: #475569;
      font-size: 0.75rem;
      padding: 0.25rem 0.6rem;
      border-radius: 6px;
      font-weight: 500;
    }

    /* 5. 深色破格引擎架构区 (#tech-concept) */
    .dark-section {
      background-color: var(--bg-dark);
      color: var(--text-light);
      position: relative;
      border-top: 1px solid var(--border-dark);
      border-bottom: 1px solid var(--border-dark);
    }
    .dark-section .section-title {
      color: #fff;
    }
    .dark-section .section-desc {
      color: #94a3b8;
    }
    .tech-concept-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3.5rem;
      align-items: center;
    }
    .arch-flow-box {
      background: var(--bg-dark-surface);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-lg);
      padding: 2.25rem;
    }
    .arch-step-node {
      display: flex;
      align-items: flex-start;
      gap: 1.25rem;
      margin-bottom: 1.5rem;
      position: relative;
    }
    .arch-step-node:not(:last-child)::after {
      content: '';
      position: absolute;
      left: 18px;
      top: 40px;
      width: 2px;
      height: calc(100% - 20px);
      background: rgba(255, 255, 255, 0.15);
    }
    .arch-node-badge {
      width: 38px;
      height: 38px;
      border-radius: 50%;
      background: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: #fff;
      flex-shrink: 0;
      box-shadow: 0 0 12px rgba(16, 185, 129, 0.4);
    }
    .arch-node-content h4 {
      font-size: 1.05rem;
      color: #f8fafc;
      margin-bottom: 0.35rem;
    }
    .arch-node-content p {
      font-size: 0.875rem;
      color: #94a3b8;
      line-height: 1.55;
    }

    /* 6. 行业应用场景演练区 (#scenarios) */
    .scenarios-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 1.5rem;
    }
    .scenario-item {
      background: #fff;
      border-radius: var(--radius-lg);
      padding: 1.75rem 1.5rem;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .scenario-item:hover {
      border-color: var(--primary);
      transform: translateY(-4px);
    }
    .scenario-icon {
      font-size: 2rem;
      margin-bottom: 1rem;
      display: inline-block;
    }
    .scenario-item h3 {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 0.75rem;
      color: var(--text-main);
    }
    .scenario-item p {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 7. 标杆案例与落地实战 (#cases) */
    .case-container {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 2.5rem;
    }
    .case-card {
      background: #fff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-card);
      overflow: hidden;
    }
    .case-image {
      height: 250px;
      overflow: hidden;
      position: relative;
    }
    .case-image img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .case-inner {
      padding: 2rem;
    }
    .case-stat-badge {
      display: inline-block;
      background: rgba(249, 115, 22, 0.1);
      color: var(--accent);
      font-weight: 700;
      padding: 0.25rem 0.75rem;
      border-radius: var(--radius-pill);
      font-size: 0.8125rem;
      margin-bottom: 0.75rem;
      border: 1px solid rgba(249, 115, 22, 0.25);
    }
    .case-inner h3 {
      font-size: 1.35rem;
      font-weight: 700;
      margin-bottom: 0.85rem;
      color: var(--text-main);
    }
    .case-inner p {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 1.5rem;
    }
    .case-metrics-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1rem;
      padding-top: 1.25rem;
      border-top: 1px solid var(--border-color);
      background: #f8fafc;
      margin: 0 -2rem -2rem -2rem;
      padding: 1.25rem 2rem;
    }
    .case-metric-box strong {
      display: block;
      font-size: 1.2rem;
      font-weight: 800;
      color: var(--primary);
      font-family: monospace;
    }
    .case-metric-box span {
      font-size: 0.75rem;
      color: var(--text-muted);
    }

    /* 8. 关键技术指标与数据统计条 (#stats) */
    .stats-bar-section {
      background: linear-gradient(135deg, #064e3b 0%, #065f46 100%);
      color: #fff;
      padding: 4rem 0;
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 2rem;
      text-align: center;
    }
    .stat-box {
      padding: 1rem;
      border-right: 1px solid rgba(255, 255, 255, 0.15);
    }
    .stat-box:last-child {
      border-right: none;
    }
    .stat-number {
      font-size: 2.85rem;
      font-weight: 900;
      font-family: monospace, sans-serif;
      color: #6ee7b7;
      line-height: 1.1;
      margin-bottom: 0.5rem;
    }
    .stat-label {
      font-size: 0.95rem;
      color: #e2e8f0;
      font-weight: 500;
    }

    /* 9. 客户声音与社会认同 (#reviews) */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.75rem;
    }
    .review-card {
      background: #fff;
      border-radius: var(--radius-lg);
      padding: 2rem;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-card);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .review-stars {
      color: #f59e0b;
      margin-bottom: 1rem;
      font-size: 1.1rem;
    }
    .review-text {
      font-size: 0.95rem;
      color: #334155;
      line-height: 1.7;
      margin-bottom: 1.5rem;
    }
    .reviewer-meta {
      display: flex;
      align-items: center;
      gap: 1rem;
      padding-top: 1rem;
      border-top: 1px solid var(--border-color);
    }
    .reviewer-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #e2e8f0;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--primary);
    }
    .reviewer-info h4 {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
    }
    .reviewer-info p {
      font-size: 0.8125rem;
      color: var(--text-muted);
    }

    /* 10. 行业技术资讯与证据 (#news) */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    .news-card {
      background: #fff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .news-card:hover {
      transform: translateY(-4px);
    }
    .news-card-body {
      padding: 1.75rem;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }
    .news-date {
      font-size: 0.8125rem;
      color: var(--text-muted);
      margin-bottom: 0.65rem;
      display: block;
      font-family: monospace;
    }
    .news-card-body h3 {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 0.85rem;
      line-height: 1.45;
      color: var(--text-main);
    }
    .news-card-body p {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 1.25rem;
    }
    .news-anchor-link {
      margin-top: auto;
      font-size: 0.875rem;
      font-weight: 600;
      color: var(--primary);
      display: inline-flex;
      align-items: center;
      gap: 0.25rem;
    }

    /* 11. 差异化技术指标对比表 (#comparison) */
    .comparison-container {
      background: #fff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-card);
      overflow: hidden;
    }
    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }
    .comparison-table th, .comparison-table td {
      padding: 1.35rem 1.75rem;
      border-bottom: 1px solid var(--border-color);
    }
    .comparison-table th {
      background: #f8fafc;
      font-weight: 700;
      color: var(--text-main);
      font-size: 1rem;
    }
    .comparison-table tr:last-child td {
      border-bottom: none;
    }
    .col-highlight {
      background: rgba(16, 185, 129, 0.04);
      color: var(--primary);
      font-weight: 700;
    }
    .comparison-table th.col-highlight {
      background: rgba(16, 185, 129, 0.1);
      color: var(--primary);
    }

    /* 12. 常见疑问解答手风琴 (#faq) */
    .faq-wrapper {
      max-width: 900px;
      margin: 0 auto;
    }
    .faq-item {
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      margin-bottom: 1rem;
      overflow: hidden;
      transition: var(--transition);
    }
    .faq-question {
      padding: 1.35rem 1.75rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 700;
      font-size: 1.05rem;
      color: var(--text-main);
      background: #fff;
      user-select: none;
    }
    .faq-question:hover {
      color: var(--primary);
    }
    .faq-icon {
      font-size: 1.25rem;
      transition: transform 0.3s ease;
      color: var(--text-muted);
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
      color: var(--primary);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out;
      background: #fafafa;
    }
    .faq-answer-inner {
      padding: 1.25rem 1.75rem 1.5rem;
      font-size: 0.95rem;
      color: #475569;
      line-height: 1.7;
      border-top: 1px solid #f1f5f9;
    }

    /* 13. 工程交付保障条 (#guarantee) */
    .guarantee-bar {
      background: #f1f5f9;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 2.5rem;
    }
    .guarantee-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 1.75rem;
    }
    .guarantee-card {
      display: flex;
      align-items: flex-start;
      gap: 1rem;
    }
    .guarantee-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: #fff;
      border: 1px solid var(--border-color);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.25rem;
      flex-shrink: 0;
      box-shadow: var(--shadow-sm);
    }
    .guarantee-card h4 {
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 0.25rem;
      color: var(--text-main);
    }
    .guarantee-card p {
      font-size: 0.8125rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 底部转化条 (CTA Banner) */
    .cta-banner-section {
      background: var(--primary-gradient);
      color: #fff;
      padding: 5rem 0;
      position: relative;
    }
    .cta-container {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 3.5rem;
      align-items: center;
    }
    .cta-content h2 {
      font-size: 2.35rem;
      font-weight: 800;
      line-height: 1.3;
      margin-bottom: 1.25rem;
    }
    .cta-content p {
      font-size: 1.05rem;
      color: #d1fae5;
      line-height: 1.7;
      margin-bottom: 2rem;
    }
    .cta-form-box {
      background: #fff;
      border-radius: var(--radius-lg);
      padding: 2.5rem;
      box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
      color: var(--text-main);
    }
    .form-group {
      margin-bottom: 1.25rem;
    }
    .form-group label {
      display: block;
      font-size: 0.875rem;
      font-weight: 600;
      margin-bottom: 0.45rem;
      color: var(--text-main);
    }
    .form-control {
      width: 100%;
      padding: 0.85rem 1rem;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      background: #f8fafc;
      transition: var(--transition);
    }
    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      background: #fff;
      box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.15);
    }
    .form-submit-btn {
      width: 100%;
      padding: 0.95rem;
      font-size: 1.05rem;
    }

    /* 浮动吸底转化条 */
    .floating-cta-bar {
      position: fixed;
      bottom: -100px;
      left: 0;
      width: 100%;
      background: rgba(15, 23, 42, 0.95);
      backdrop-filter: blur(8px);
      color: #fff;
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      z-index: 99;
      box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.2);
      transition: bottom 0.4s ease;
      padding: 0.85rem 0;
    }
    .floating-cta-bar.show {
      bottom: 0;
    }
    .floating-content {
      display: flex;
      justify-content: space-between;
      align-items: center;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 1.5rem;
    }
    .floating-text {
      display: flex;
      align-items: center;
      gap: 1rem;
    }
    .floating-title {
      font-weight: 700;
      font-size: 1rem;
    }
    .floating-sub {
      font-size: 0.85rem;
      color: #94a3b8;
    }

    /* 全局页脚 */
    .site-footer {
      background: #091120;
      color: #94a3b8;
      font-size: 0.875rem;
      padding: 4.5rem 0 2rem;
      border-top: 1px solid #1e293b;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
      gap: 3rem;
      margin-bottom: 3.5rem;
    }
    .footer-brand h3 {
      color: #fff;
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 0.85rem;
    }
    .footer-brand p {
      line-height: 1.65;
      margin-bottom: 1.25rem;
    }
    .footer-col h4 {
      color: #fff;
      font-size: 1rem;
      font-weight: 600;
      margin-bottom: 1.25rem;
    }
    .footer-links li {
      margin-bottom: 0.65rem;
    }
    .footer-links a:hover {
      color: var(--primary-light);
    }
    .footer-contact li {
      margin-bottom: 0.75rem;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    .footer-bottom {
      padding-top: 2rem;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 1rem;
    }
    .copyright-text {
      font-size: 0.8125rem;
    }
    .icp-links {
      display: flex;
      gap: 1.5rem;
      font-size: 0.8125rem;
    }

    /* 响应式断点控制 */
    @media (max-width: 1024px) {
      .hero-grid, .intro-grid, .tech-concept-grid, .cta-container {
        grid-template-columns: 1fr;
        gap: 2.5rem;
      }
      .advantages-grid, .products-grid, .reviews-grid, .news-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .scenarios-grid, .guarantee-grid, .stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 2.5rem;
      }
      .hero-content h1 {
        font-size: 2.4rem;
      }
    }

    @media (max-width: 768px) {
      .top-bar {
        display: none;
      }
      .menu-toggle {
        display: block;
      }
      .nav-menu {
        position: fixed;
        top: 65px;
        left: 0;
        width: 100%;
        background: #fff;
        flex-direction: column;
        padding: 2rem;
        gap: 1.25rem;
        box-shadow: var(--shadow-md);
        display: none;
        border-bottom: 1px solid var(--border-color);
      }
      .nav-menu.show {
        display: flex;
      }
      .nav-actions {
        display: none;
      }
      .advantages-grid, .products-grid, .reviews-grid, .news-grid, .case-container, .scenarios-grid, .guarantee-grid, .stats-grid {
        grid-template-columns: 1fr;
      }
      .stat-box {
        border-right: none;
        border-bottom: 1px solid rgba(255, 255, 255, 0.15);
        padding-bottom: 1.5rem;
      }
      .stat-box:last-child {
        border-bottom: none;
      }
      .hero-specs-row {
        grid-template-columns: 1fr;
        gap: 1rem;
      }
      .footer-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
      }
      .section-title {
        font-size: 1.75rem;
      }
      .hero-content h1 {
        font-size: 2rem;
      }
      .floating-cta-bar {
        display: none;
      }
    }