/* roulang page: index */
:root {
      --primary: #2563EB;
      --primary-dark: #1E40AF;
      --primary-light: #DBEAFE;
      --secondary: #0D9488;
      --secondary-light: #CCFBF1;
      --accent: #F59E0B;
      --accent-light: #FEF3C7;
      --dark: #0F172A;
      --dark-card: #1E293B;
      --slate: #334155;
      --muted: #64748B;
      --border: #E2E8F0;
      --bg-light: #F8FAFC;
      --white: #FFFFFF;
      --radius-lg: 20px;
      --radius-md: 12px;
      --radius-full: 9999px;
      --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.04);
      --shadow-card: 0 10px 25px -5px rgba(15, 23, 42, 0.06), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
      --shadow-hover: 0 20px 30px -10px rgba(37, 99, 235, 0.15);
      --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: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      line-height: 1.75;
      color: var(--slate);
      background-color: var(--white);
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

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

    ul, ol {
      list-style: none;
    }

    button, input, select, textarea {
      font-family: inherit;
    }

    .container {
      width: 100%;
      max-width: 1240px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 顶部双行导航系统 */
    .top-bar {
      height: 38px;
      background: #F1F5F9;
      border-bottom: 1px solid var(--border);
      font-size: 13px;
      color: var(--muted);
      display: flex;
      align-items: center;
    }
    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .top-bar-contact {
      display: flex;
      gap: 20px;
      align-items: center;
    }
    .top-bar-item {
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .top-bar-dot {
      width: 8px;
      height: 8px;
      background: #10B981;
      border-radius: 50%;
      display: inline-block;
    }

    .main-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(226, 232, 240, 0.8);
      transition: var(--transition);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo-area {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 22px;
      font-weight: 800;
      color: var(--dark);
      letter-spacing: -0.5px;
    }
    .logo-badge {
      background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
      color: var(--white);
      padding: 4px 10px;
      border-radius: 8px;
      font-size: 14px;
      font-weight: 700;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
    }
    .nav-item {
      font-size: 15px;
      font-weight: 500;
      color: var(--slate);
      position: relative;
      padding: 8px 0;
    }
    .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);
      border-radius: 2px;
    }
    .nav-item:hover::after, .nav-item.active::after {
      width: 100%;
    }
    .nav-cta {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 11px 24px;
      border-radius: var(--radius-full);
      font-weight: 600;
      font-size: 14px;
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      gap: 8px;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, #1D4ED8 100%);
      color: var(--white);
      box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
    }
    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
    }
    .btn-secondary {
      background: var(--white);
      color: var(--slate);
      border-color: var(--border);
    }
    .btn-secondary:hover {
      background: #F8FAFC;
      border-color: var(--primary);
      color: var(--primary);
      transform: translateY(-2px);
    }
    .btn-accent {
      background: linear-gradient(135deg, var(--accent) 0%, #D97706 100%);
      color: var(--white);
      box-shadow: 0 4px 14px rgba(245, 158, 11, 0.35);
    }
    .btn-accent:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(245, 158, 11, 0.45);
    }

    /* 移动端汉堡按钮 */
    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }
    .mobile-toggle span {
      display: block;
      width: 24px;
      height: 2.5px;
      background: var(--dark);
      margin: 5px 0;
      border-radius: 2px;
      transition: var(--transition);
    }

    /* 通用板块样式与标题 */
    .section {
      padding: 85px 0;
      position: relative;
    }
    .section-alt {
      background-color: var(--bg-light);
      border-top: 1px solid var(--border);
      border-bottom: 1px solid var(--border);
    }
    .section-dark {
      background: linear-gradient(145deg, #0B132B 0%, #1C2541 100%);
      color: #E2E8F0;
    }
    .section-header {
      text-align: center;
      max-width: 780px;
      margin: 0 auto 56px auto;
    }
    .badge-tag {
      display: inline-block;
      padding: 5px 14px;
      border-radius: var(--radius-full);
      font-size: 13px;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      margin-bottom: 14px;
      background: var(--primary-light);
      color: var(--primary-dark);
    }
    .badge-tag-teal {
      background: var(--secondary-light);
      color: var(--secondary);
    }
    .badge-tag-accent {
      background: var(--accent-light);
      color: #B45309;
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      line-height: 1.35;
      color: var(--dark);
      margin-bottom: 16px;
    }
    .section-dark .section-title {
      color: var(--white);
    }
    .section-desc {
      font-size: 16px;
      color: var(--muted);
      line-height: 1.8;
    }
    .section-dark .section-desc {
      color: #94A3B8;
    }

    /* 1. 首屏 Hero */
    .hero-section {
      position: relative;
      background: linear-gradient(135deg, #EFF6FF 0%, #F0FDFA 100%);
      padding: 60px 0 80px;
      overflow: hidden;
      border-bottom: 1px solid var(--border);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 40px;
      align-items: center;
    }
    .hero-h1 {
      font-size: 40px;
      font-weight: 800;
      line-height: 1.25;
      color: var(--dark);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-h1 span {
      background: linear-gradient(120deg, var(--primary) 0%, var(--secondary) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-intro {
      font-size: 16px;
      line-height: 1.8;
      color: var(--slate);
      margin-bottom: 28px;
    }
    .hero-highlights {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 14px;
      margin-bottom: 32px;
    }
    .hero-hl-item {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 14px;
      font-weight: 600;
      color: var(--dark);
    }
    .hero-hl-icon {
      width: 22px;
      height: 22px;
      border-radius: 50%;
      background: var(--secondary-light);
      color: var(--secondary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 12px;
      flex-shrink: 0;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-visual-card {
      position: relative;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: 0 25px 50px -12px rgba(15, 23, 42, 0.15);
      border: 4px solid var(--white);
    }
    .hero-visual-card img {
      width: 100%;
      height: 420px;
      object-fit: cover;
      display: block;
    }
    .hero-floating-badge {
      position: absolute;
      bottom: 24px;
      left: 24px;
      right: 24px;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(10px);
      padding: 16px 20px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      border: 1px solid rgba(255, 255, 255, 0.7);
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .badge-data-num {
      font-size: 24px;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.2;
    }
    .badge-data-label {
      font-size: 12px;
      color: var(--muted);
      margin-top: 2px;
    }

    /* 2. 指标看板 */
    .metrics-section {
      background: var(--white);
      padding: 40px 0;
      margin-top: -30px;
      position: relative;
      z-index: 10;
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      background: var(--white);
      padding: 30px;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
      border: 1px solid var(--border);
    }
    .metric-box {
      text-align: center;
      border-right: 1px solid var(--border);
      padding: 0 16px;
    }
    .metric-box:last-child {
      border-right: none;
    }
    .metric-value {
      font-size: 36px;
      font-weight: 800;
      color: var(--dark);
      margin-bottom: 6px;
      display: flex;
      align-items: baseline;
      justify-content: center;
      gap: 4px;
    }
    .metric-value span {
      font-size: 20px;
      color: var(--primary);
    }
    .metric-name {
      font-size: 14px;
      color: var(--muted);
      font-weight: 500;
    }

    /* 3. 研发体系 */
    .system-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 50px;
      align-items: center;
    }
    .system-media {
      position: relative;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }
    .system-media img {
      width: 100%;
      height: 400px;
      object-fit: cover;
    }
    .system-spec-box {
      background: #F8FAFC;
      border-left: 4px solid var(--primary);
      padding: 16px 20px;
      border-radius: 0 var(--radius-md) var(--radius-md) 0;
      margin: 20px 0;
      font-size: 14px;
      color: var(--slate);
    }

    /* 4. 优势矩阵 Bento Grid */
    .bento-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .bento-card {
      background: var(--white);
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 32px 28px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .bento-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(37, 99, 235, 0.4);
    }
    .bento-icon {
      width: 52px;
      height: 52px;
      border-radius: 14px;
      background: linear-gradient(135deg, #EEF2FF 0%, #E0E7FF 100%);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 24px;
      margin-bottom: 20px;
    }
    .bento-title {
      font-size: 19px;
      font-weight: 700;
      color: var(--dark);
      margin-bottom: 12px;
    }
    .bento-desc {
      font-size: 14px;
      color: var(--muted);
      line-height: 1.7;
    }

    /* 5. 产品展示 */
    .product-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .product-card {
      background: var(--white);
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .product-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-hover);
      border-color: var(--primary);
    }
    .product-img {
      position: relative;
      height: 230px;
      overflow: hidden;
    }
    .product-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: var(--transition);
    }
    .product-card:hover .product-img img {
      transform: scale(1.05);
    }
    .product-tag {
      position: absolute;
      top: 14px;
      left: 14px;
      background: rgba(15, 23, 42, 0.75);
      backdrop-filter: blur(6px);
      color: var(--white);
      font-size: 12px;
      padding: 4px 10px;
      border-radius: 6px;
      font-weight: 600;
    }
    .product-body {
      padding: 26px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }
    .product-title {
      font-size: 20px;
      font-weight: 700;
      color: var(--dark);
      margin-bottom: 10px;
    }
    .product-specs {
      margin: 16px 0 24px;
      background: #F8FAFC;
      padding: 12px 16px;
      border-radius: var(--radius-md);
      font-size: 13px;
      color: var(--slate);
    }
    .product-specs li {
      margin-bottom: 6px;
      display: flex;
      justify-content: space-between;
    }
    .product-specs li:last-child {
      margin-bottom: 0;
    }

    /* 6. 对比看板 */
    .compare-container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
    }
    .compare-card {
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-sm);
    }
    .compare-traditional {
      background: #FFF1F2;
      border: 1px solid #FECDD3;
    }
    .compare-modern {
      background: #F0FDF4;
      border: 1px solid #BBF7D0;
    }
    .compare-head {
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 20px;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .compare-traditional .compare-head { color: #BE123C; }
    .compare-modern .compare-head { color: #15803D; }
    .compare-list li {
      margin-bottom: 16px;
      display: flex;
      gap: 12px;
      font-size: 14px;
      line-height: 1.6;
    }

    /* 7. 深色案例区 */
    .steam-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .steam-left h3 {
      font-size: 26px;
      font-weight: 700;
      color: var(--white);
      margin-bottom: 20px;
      line-height: 1.4;
    }
    .steam-pillars {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
      margin-top: 28px;
    }
    .steam-pillar-item {
      background: rgba(255, 255, 255, 0.06);
      border: 1px solid rgba(255, 255, 255, 0.1);
      padding: 16px 18px;
      border-radius: var(--radius-md);
    }
    .steam-pillar-title {
      color: #38BDF8;
      font-size: 15px;
      font-weight: 700;
      margin-bottom: 6px;
    }
    .steam-pillar-desc {
      font-size: 13px;
      color: #94A3B8;
      line-height: 1.6;
    }
    .steam-right {
      position: relative;
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid rgba(255, 255, 255, 0.15);
      box-shadow: 0 20px 40px rgba(0,0,0,0.4);
    }
    .steam-right img {
      width: 100%;
      height: 380px;
      object-fit: cover;
    }

    /* 8. 标杆故事 */
    .story-grid {
      display: flex;
      flex-direction: column;
      gap: 32px;
    }
    .story-card {
      display: grid;
      grid-template-columns: 380px 1fr;
      background: var(--white);
      border-radius: var(--radius-lg);
      border: 1px solid var(--border);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .story-card:hover {
      box-shadow: var(--shadow-hover);
    }
    .story-img {
      height: 100%;
      min-height: 260px;
    }
    .story-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .story-body {
      padding: 36px 40px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .story-quote {
      font-size: 16px;
      color: var(--slate);
      font-style: italic;
      line-height: 1.8;
      margin-bottom: 20px;
      position: relative;
    }
    .story-meta {
      display: flex;
      align-items: center;
      justify-content: space-between;
      border-top: 1px solid var(--border);
      padding-top: 18px;
    }
    .story-author {
      font-weight: 700;
      color: var(--dark);
      font-size: 15px;
    }
    .story-role {
      font-size: 13px;
      color: var(--muted);
      margin-top: 2px;
    }
    .story-badge {
      background: var(--secondary-light);
      color: var(--secondary);
      padding: 4px 12px;
      border-radius: var(--radius-full);
      font-size: 13px;
      font-weight: 600;
    }

    /* 9. 里程碑时间轴 */
    .timeline {
      position: relative;
      max-width: 860px;
      margin: 0 auto;
      padding: 20px 0;
    }
    .timeline::before {
      content: '';
      position: absolute;
      top: 0;
      bottom: 0;
      left: 50%;
      width: 2px;
      background: var(--border);
      transform: translateX(-50%);
    }
    .timeline-item {
      margin-bottom: 40px;
      position: relative;
      width: 50%;
      padding: 0 36px;
    }
    .timeline-item:nth-child(odd) {
      left: 0;
      text-align: right;
    }
    .timeline-item:nth-child(even) {
      left: 50%;
      text-align: left;
    }
    .timeline-dot {
      position: absolute;
      top: 6px;
      width: 16px;
      height: 16px;
      border-radius: 50%;
      background: var(--primary);
      border: 3px solid var(--white);
      box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.25);
    }
    .timeline-item:nth-child(odd) .timeline-dot {
      right: -8px;
    }
    .timeline-item:nth-child(even) .timeline-dot {
      left: -8px;
    }
    .timeline-year {
      font-size: 18px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 6px;
    }
    .timeline-card {
      background: var(--white);
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 20px;
      box-shadow: var(--shadow-sm);
    }
    .timeline-title {
      font-size: 16px;
      font-weight: 700;
      color: var(--dark);
      margin-bottom: 8px;
    }
    .timeline-text {
      font-size: 13px;
      color: var(--muted);
      line-height: 1.6;
    }

    /* 10. 口碑证言墙 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .testimonial-card {
      background: var(--white);
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 30px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .testimonial-stars {
      color: var(--accent);
      font-size: 16px;
      margin-bottom: 14px;
      letter-spacing: 2px;
    }
    .testimonial-text {
      font-size: 14px;
      color: var(--slate);
      line-height: 1.8;
      margin-bottom: 20px;
    }
    .testimonial-profile {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #F1F5F9;
      padding-top: 16px;
    }
    .testimonial-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary-light) 0%, #C7D2FE 100%);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 15px;
    }
    .testimonial-name {
      font-size: 14px;
      font-weight: 700;
      color: var(--dark);
    }
    .testimonial-unit {
      font-size: 12px;
      color: var(--muted);
    }

    /* 11. 前沿资讯 */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .news-card {
      background: var(--white);
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .news-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
    }
    .news-img {
      height: 190px;
      overflow: hidden;
    }
    .news-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: var(--transition);
    }
    .news-card:hover .news-img img {
      transform: scale(1.05);
    }
    .news-content {
      padding: 24px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .news-meta {
      font-size: 12px;
      color: var(--muted);
      margin-bottom: 10px;
    }
    .news-title {
      font-size: 17px;
      font-weight: 700;
      color: var(--dark);
      margin-bottom: 12px;
      line-height: 1.5;
    }
    .news-summary {
      font-size: 13px;
      color: var(--slate);
      line-height: 1.7;
    }

    /* 12. 安全保障 */
    .guarantee-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .guarantee-card {
      background: var(--white);
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 24px;
      text-align: center;
      transition: var(--transition);
    }
    .guarantee-card:hover {
      border-color: var(--secondary);
      box-shadow: 0 8px 20px rgba(13, 148, 136, 0.1);
    }
    .guarantee-icon {
      width: 56px;
      height: 56px;
      border-radius: 50%;
      background: var(--secondary-light);
      color: var(--secondary);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      margin-bottom: 16px;
      font-weight: bold;
    }
    .guarantee-title {
      font-size: 16px;
      font-weight: 700;
      color: var(--dark);
      margin-bottom: 8px;
    }
    .guarantee-desc {
      font-size: 13px;
      color: var(--muted);
      line-height: 1.6;
    }

    /* 13. 学段指南 */
    .stage-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .stage-card {
      background: var(--white);
      border-radius: var(--radius-lg);
      padding: 32px 28px;
      border: 1px solid var(--border);
      position: relative;
    }
    .stage-num {
      position: absolute;
      top: 20px;
      right: 24px;
      font-size: 32px;
      font-weight: 900;
      color: #EEF2FF;
      line-height: 1;
    }
    .stage-title {
      font-size: 19px;
      font-weight: 700;
      color: var(--dark);
      margin-bottom: 12px;
    }
    .stage-tag {
      display: inline-block;
      font-size: 12px;
      font-weight: 600;
      padding: 3px 10px;
      border-radius: var(--radius-full);
      background: #EFF6FF;
      color: var(--primary);
      margin-bottom: 16px;
    }
    .stage-desc {
      font-size: 14px;
      color: var(--muted);
      line-height: 1.7;
      margin-bottom: 18px;
    }
    .stage-list {
      border-top: 1px solid #F1F5F9;
      padding-top: 16px;
      font-size: 13px;
      color: var(--slate);
    }
    .stage-list li {
      margin-bottom: 8px;
      position: relative;
      padding-left: 14px;
    }
    .stage-list li::before {
      content: '•';
      position: absolute;
      left: 0;
      color: var(--primary);
    }

    /* 14. FAQ 手风琴 */
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--white);
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      margin-bottom: 16px;
      overflow: hidden;
      transition: var(--transition);
    }
    .faq-item[open] {
      border-color: var(--primary);
      box-shadow: var(--shadow-sm);
    }
    .faq-question {
      padding: 20px 24px;
      font-size: 16px;
      font-weight: 700;
      color: var(--dark);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      list-style: none;
      user-select: none;
    }
    .faq-question::-webkit-details-marker {
      display: none;
    }
    .faq-question::after {
      content: '+';
      font-size: 22px;
      font-weight: 400;
      color: var(--muted);
      transition: var(--transition);
    }
    .faq-item[open] .faq-question::after {
      content: '−';
      color: var(--primary);
    }
    .faq-answer {
      padding: 0 24px 22px 24px;
      font-size: 14px;
      color: var(--slate);
      line-height: 1.8;
      border-top: 1px solid #F8FAFC;
    }

    /* 15. 转化 CTA */
    .cta-box {
      background: linear-gradient(135deg, #1E40AF 0%, #0D9488 100%);
      border-radius: var(--radius-lg);
      padding: 60px 48px;
      color: var(--white);
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 50px;
      align-items: center;
      box-shadow: 0 25px 50px -12px rgba(30, 64, 175, 0.35);
    }
    .cta-content h2 {
      font-size: 32px;
      font-weight: 800;
      line-height: 1.3;
      margin-bottom: 18px;
    }
    .cta-content p {
      font-size: 15px;
      line-height: 1.8;
      opacity: 0.9;
      margin-bottom: 24px;
    }
    .cta-check-list {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 12px;
      font-size: 14px;
    }
    .cta-form {
      background: var(--white);
      padding: 36px 32px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      color: var(--slate);
    }
    .cta-form-title {
      font-size: 20px;
      font-weight: 700;
      color: var(--dark);
      margin-bottom: 6px;
      text-align: center;
    }
    .cta-form-subtitle {
      font-size: 13px;
      color: var(--muted);
      margin-bottom: 20px;
      text-align: center;
    }
    .form-group {
      margin-bottom: 14px;
    }
    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 11px 14px;
      border: 1px solid var(--border);
      border-radius: 8px;
      font-size: 14px;
      outline: none;
      transition: var(--transition);
      background: #F8FAFC;
    }
    .form-input:focus, .form-select:focus, .form-textarea:focus {
      border-color: var(--primary);
      background: var(--white);
      box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
    }
    .btn-submit {
      width: 100%;
      margin-top: 8px;
      padding: 13px;
      font-size: 15px;
    }

    /* 页脚 Footer */
    .site-footer {
      background: #0B132B;
      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: 1.5fr 1fr 1fr 1.2fr;
      gap: 40px;
      margin-bottom: 50px;
    }
    .footer-brand-title {
      font-size: 22px;
      font-weight: 800;
      color: var(--white);
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .footer-brand-desc {
      line-height: 1.8;
      font-size: 13px;
      margin-bottom: 20px;
    }
    .footer-col-title {
      font-size: 16px;
      font-weight: 700;
      color: var(--white);
      margin-bottom: 20px;
    }
    .footer-links li {
      margin-bottom: 12px;
    }
    .footer-links a:hover {
      color: var(--white);
      padding-left: 4px;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 28px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 13px;
    }
    .footer-bottom a:hover {
      color: var(--white);
    }

    /* 响应式样式适配 */
    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .system-grid {
        grid-template-columns: 1fr;
      }
      .bento-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .product-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .news-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .steam-wrapper {
        grid-template-columns: 1fr;
      }
      .guarantee-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .cta-box {
        grid-template-columns: 1fr;
        padding: 40px 28px;
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .top-bar {
        display: none;
      }
      .nav-links, .nav-cta {
        display: none;
      }
      .mobile-toggle {
        display: block;
      }
      .nav-container {
        height: 60px;
      }
      .hero-h1 {
        font-size: 28px;
      }
      .section {
        padding: 60px 0;
      }
      .section-title {
        font-size: 26px;
      }
      .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
        padding: 20px;
      }
      .metric-box {
        border-right: none;
        border-bottom: 1px solid var(--border);
        padding-bottom: 16px;
      }
      .metric-box:last-child {
        border-bottom: none;
      }
      .bento-grid, .product-grid, .compare-container, .testimonial-grid, .news-grid, .stage-grid {
        grid-template-columns: 1fr;
      }
      .story-card {
        grid-template-columns: 1fr;
      }
      .story-body {
        padding: 24px;
      }
      .timeline::before {
        left: 20px;
      }
      .timeline-item {
        width: 100%;
        left: 0 !important;
        text-align: left !important;
        padding-left: 50px;
        padding-right: 0;
      }
      .timeline-dot {
        left: 12px !important;
      }
      .guarantee-grid {
        grid-template-columns: 1fr;
      }
      .cta-check-list {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
      }
      /* 移动端菜单抽屉 */
      .mobile-drawer {
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        bottom: 0;
        background: var(--white);
        z-index: 999;
        padding: 24px;
        display: none;
        flex-direction: column;
        gap: 18px;
        border-top: 1px solid var(--border);
      }
      .mobile-drawer.open {
        display: flex;
      }
      .mobile-drawer .nav-item {
        font-size: 18px;
        font-weight: 600;
        padding: 10px 0;
        border-bottom: 1px solid #F1F5F9;
      }
    }