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

    :root {
      --primary: #2563eb;
      --primary-dark: #1e40af;
      --primary-light: #dbeafe;
      --accent: #f97316;
      --accent-light: #fff7ed;
      --ink: #0f172a;
      --ink-soft: #334155;
      --muted: #64748b;
      --bg: #f8fafc;
      --surface: #ffffff;
      --border: #e2e8f0;
      --radius: 20px;
      --radius-sm: 12px;
      --shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.08);
      --shadow-hover: 0 20px 40px -12px rgba(37, 99, 235, 0.2);
      --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --container: 1180px;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font);
      background: var(--bg);
      color: var(--ink);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      background-image:
        radial-gradient(circle at 15% 20%, rgba(219, 234, 254, 0.55) 0%, transparent 32%),
        radial-gradient(circle at 85% 10%, rgba(255, 247, 237, 0.7) 0%, transparent 30%),
        radial-gradient(circle at 70% 70%, rgba(219, 234, 254, 0.3) 0%, transparent 35%);
      background-attachment: fixed;
    }

    a {
      color: inherit;
      text-decoration: none;
    }

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

    .container {
      width: 100%;
      max-width: var(--container);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.82);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border-bottom: 1px solid rgba(226, 232, 240, 0.8);
      transition: box-shadow 0.3s;
    }

    .site-header.scrolled {
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
    }

    .nav-wrap {
      display: flex;
      align-items: center;
      justify-content: space-between;
      min-height: 68px;
      gap: 16px;
    }

    .brand {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 800;
      font-size: 1.15rem;
      letter-spacing: -0.02em;
      color: var(--ink);
      flex-shrink: 0;
    }

    .brand .logo {
      width: 40px;
      height: auto;
      border-radius: 8px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      flex-wrap: wrap;
    }

    .nav-links a {
      font-size: 0.875rem;
      font-weight: 500;
      color: var(--ink-soft);
      padding: 8px 12px;
      border-radius: 8px;
      transition: background 0.2s, color 0.2s;
      white-space: nowrap;
    }

    .nav-links a:hover {
      background: var(--primary-light);
      color: var(--primary-dark);
    }

    .nav-cta {
      display: flex;
      align-items: center;
      gap: 10px;
      flex-shrink: 0;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      font-weight: 600;
      font-size: 0.9rem;
      border-radius: 999px;
      padding: 10px 22px;
      border: 2px solid transparent;
      cursor: pointer;
      transition: transform 0.2s, box-shadow 0.25s, background 0.2s, color 0.2s;
      white-space: nowrap;
      line-height: 1.2;
    }

    .btn-primary {
      background: var(--primary);
      color: #fff;
      border-color: var(--primary);
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      border-color: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 12px 24px -8px rgba(37, 99, 235, 0.45);
    }

    .btn-outline {
      background: transparent;
      color: var(--ink);
      border-color: var(--border);
    }

    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      transform: translateY(-2px);
    }

    .btn-accent {
      background: var(--accent);
      color: #fff;
      border-color: var(--accent);
    }

    .btn-accent:hover {
      background: #ea580c;
      border-color: #ea580c;
      transform: translateY(-2px);
      box-shadow: 0 12px 24px -8px rgba(249, 115, 22, 0.4);
    }

    .btn-sm {
      padding: 8px 16px;
      font-size: 0.8rem;
    }

    .menu-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
      padding: 6px;
      width: 40px;
      height: 40px;
      justify-content: center;
      align-items: center;
      border-radius: 8px;
      transition: background 0.2s;
    }

    .menu-toggle:hover {
      background: var(--primary-light);
    }

    .menu-toggle span {
      display: block;
      width: 22px;
      height: 2px;
      background: var(--ink);
      border-radius: 2px;
      transition: transform 0.3s, opacity 0.3s;
    }

    /* Hero */
    .hero {
      padding: 72px 0 56px;
      position: relative;
      overflow: hidden;
    }

    .hero::before {
      content: "";
      position: absolute;
      top: -120px;
      right: -80px;
      width: 480px;
      height: 480px;
      border-radius: 50%;
      background: radial-gradient(circle, rgba(37, 99, 235, 0.1) 0%, transparent 70%);
      pointer-events: none;
    }

    .hero::after {
      content: "";
      position: absolute;
      bottom: -140px;
      left: -60px;
      width: 380px;
      height: 380px;
      border-radius: 50%;
      background: radial-gradient(circle, rgba(249, 115, 22, 0.08) 0%, transparent 70%);
      pointer-events: none;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 48px;
      align-items: center;
      position: relative;
      z-index: 1;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: var(--primary-light);
      color: var(--primary-dark);
      font-size: 0.8rem;
      font-weight: 600;
      padding: 6px 16px;
      border-radius: 999px;
      margin-bottom: 20px;
      letter-spacing: 0.02em;
    }

    .hero-badge::before {
      content: "";
      width: 7px;
      height: 7px;
      background: var(--primary);
      border-radius: 50%;
      animation: pulse 2s infinite;
    }

    @keyframes pulse {
      0%, 100% { opacity: 1; transform: scale(1); }
      50% { opacity: 0.5; transform: scale(0.8); }
    }

    .hero h1 {
      font-size: clamp(2rem, 4vw, 3rem);
      font-weight: 800;
      line-height: 1.18;
      letter-spacing: -0.03em;
      margin-bottom: 20px;
      color: var(--ink);
    }

    .hero h1 em {
      font-style: normal;
      color: var(--primary);
      position: relative;
    }

    .hero-desc {
      font-size: 1.0625rem;
      color: var(--ink-soft);
      margin-bottom: 28px;
      max-width: 540px;
      line-height: 1.7;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      margin-bottom: 32px;
    }

    .hero-stats {
      display: flex;
      flex-wrap: wrap;
      gap: 28px;
    }

    .hero-stat {
      display: flex;
      flex-direction: column;
    }

    .hero-stat strong {
      font-size: 1.5rem;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.02em;
      line-height: 1.2;
    }

    .hero-stat span {
      font-size: 0.8rem;
      color: var(--muted);
      margin-top: 2px;
    }

    .hero-visual {
      position: relative;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .hero-card {
      background: var(--surface);
      border-radius: var(--radius);
      padding: 22px 24px;
      box-shadow: var(--shadow);
      border: 1px solid var(--border);
      transition: transform 0.3s, box-shadow 0.3s;
      animation: floatUp 0.8s ease-out both;
    }

    .hero-card:nth-child(2) {
      animation-delay: 0.15s;
      margin-left: 28px;
    }

    .hero-card:nth-child(3) {
      animation-delay: 0.3s;
      margin-right: 20px;
    }

    @keyframes floatUp {
      from { opacity: 0; transform: translateY(20px); }
      to { opacity: 1; transform: translateY(0); }
    }

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

    .hero-card-head {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 12px;
    }

    .hero-card-title {
      font-weight: 700;
      font-size: 0.95rem;
      color: var(--ink);
    }

    .tag {
      display: inline-block;
      font-size: 0.65rem;
      font-weight: 700;
      padding: 3px 10px;
      border-radius: 999px;
      background: var(--primary-light);
      color: var(--primary-dark);
      letter-spacing: 0.02em;
    }

    .tag-orange {
      background: var(--accent-light);
      color: #c2410c;
    }

    .hero-card p {
      font-size: 0.85rem;
      color: var(--muted);
      line-height: 1.55;
    }

    .hero-bar {
      height: 6px;
      background: var(--border);
      border-radius: 999px;
      margin-top: 12px;
      overflow: hidden;
    }

    .hero-bar i {
      display: block;
      height: 100%;
      border-radius: 999px;
      background: linear-gradient(90deg, var(--primary), #60a5fa);
      width: 82%;
      animation: barGrow 1.4s ease-out both;
    }

    @keyframes barGrow {
      from { width: 0; }
    }

    /* 通用 Section */
    .section {
      padding: 64px 0;
    }

    .section-head {
      text-align: center;
      max-width: 700px;
      margin: 0 auto 44px;
    }

    .section-head .eyebrow {
      display: inline-block;
      font-size: 0.75rem;
      font-weight: 700;
      letter-spacing: 0.12em;
      text-transform: uppercase;
      color: var(--primary);
      background: var(--primary-light);
      padding: 5px 16px;
      border-radius: 999px;
      margin-bottom: 14px;
    }

    .section-head h2 {
      font-size: clamp(1.6rem, 2.8vw, 2.25rem);
      font-weight: 800;
      letter-spacing: -0.025em;
      line-height: 1.25;
      margin-bottom: 12px;
      color: var(--ink);
    }

    .section-head p {
      font-size: 0.975rem;
      color: var(--muted);
      line-height: 1.65;
    }

    /* 卡片通用 */
    .card {
      background: var(--surface);
      border-radius: var(--radius-sm);
      padding: 28px 24px;
      border: 1px solid var(--border);
      transition: transform 0.25s, box-shadow 0.25s, border-color 0.25s;
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.02);
    }

    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: var(--primary-light);
    }

    .card-icon {
      width: 44px;
      height: 44px;
      border-radius: 12px;
      background: var(--primary-light);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.25rem;
      margin-bottom: 16px;
      color: var(--primary);
    }

    .card h3 {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--ink);
    }

    .card p {
      font-size: 0.875rem;
      color: var(--muted);
      line-height: 1.6;
    }

    /* 数据指标 */
    .stats-row {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .stat-card {
      text-align: center;
      padding: 28px 16px;
      background: var(--surface);
      border-radius: var(--radius-sm);
      border: 1px solid var(--border);
      transition: transform 0.25s, box-shadow 0.25s;
    }

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

    .stat-card strong {
      display: block;
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.02em;
      line-height: 1.2;
    }

    .stat-card span {
      display: block;
      font-size: 0.8rem;
      color: var(--muted);
      margin-top: 6px;
    }

    /* 服务能力网格 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    /* 流程步骤 */
    .process-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      counter-reset: step;
    }

    .process-item {
      position: relative;
      padding: 28px 24px;
      background: var(--surface);
      border-radius: var(--radius-sm);
      border: 1px solid var(--border);
      transition: transform 0.25s, box-shadow 0.25s;
    }

    .process-item:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

    .process-item::before {
      counter-increment: step;
      content: "0" counter(step);
      display: block;
      font-size: 1.6rem;
      font-weight: 800;
      color: var(--primary-light);
      margin-bottom: 12px;
      letter-spacing: -0.02em;
    }

    .process-item h3 {
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--ink);
    }

    .process-item p {
      font-size: 0.85rem;
      color: var(--muted);
      line-height: 1.6;
    }

    /* 对比表格 */
    .table-wrap {
      overflow-x: auto;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border);
      background: var(--surface);
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      font-size: 0.9rem;
      min-width: 700px;
    }

    .compare-table th,
    .compare-table td {
      padding: 16px 20px;
      text-align: left;
      border-bottom: 1px solid var(--border);
    }

    .compare-table thead th {
      background: #f1f5f9;
      font-weight: 700;
      color: var(--ink);
      font-size: 0.85rem;
      white-space: nowrap;
    }

    .compare-table tbody tr:last-child td {
      border-bottom: none;
    }

    .compare-table tbody tr:hover {
      background: #f8fafc;
    }

    .compare-table .highlight {
      background: #eff6ff;
      font-weight: 600;
      color: var(--primary-dark);
    }

    .score-badge {
      display: inline-flex;
      align-items: center;
      gap: 4px;
      font-weight: 800;
      color: var(--primary);
      font-size: 1.1rem;
    }

    .stars {
      color: #f59e0b;
      letter-spacing: 2px;
      font-size: 0.95rem;
    }

    /* 案例展示 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }

    .case-card {
      background: var(--surface);
      border-radius: var(--radius-sm);
      overflow: hidden;
      border: 1px solid var(--border);
      transition: transform 0.25s, box-shadow 0.25s;
    }

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

    .case-image {
      width: 100%;
      aspect-ratio: 16 / 10;
      background: #f1f5f9;
      overflow: hidden;
    }

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

    .case-card:hover .case-image img {
      transform: scale(1.03);
    }

    .case-body {
      padding: 20px 22px;
    }

    .case-body h3 {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 6px;
      color: var(--ink);
    }

    .case-body p {
      font-size: 0.85rem;
      color: var(--muted);
      line-height: 1.55;
    }

    /* 用户评论 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .review-card {
      background: var(--surface);
      border-radius: var(--radius-sm);
      padding: 26px 24px;
      border: 1px solid var(--border);
      transition: transform 0.25s, box-shadow 0.25s;
      display: flex;
      flex-direction: column;
    }

    .review-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-hover);
    }

    .review-stars {
      color: #f59e0b;
      font-size: 0.85rem;
      letter-spacing: 2px;
      margin-bottom: 12px;
    }

    .review-text {
      font-size: 0.9rem;
      color: var(--ink-soft);
      line-height: 1.7;
      flex: 1;
      margin-bottom: 16px;
    }

    .review-author {
      display: flex;
      align-items: center;
      gap: 10px;
      border-top: 1px solid var(--border);
      padding-top: 14px;
    }

    .avatar {
      width: 38px;
      height: 38px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary-dark);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.85rem;
      flex-shrink: 0;
    }

    .review-author strong {
      display: block;
      font-size: 0.85rem;
      color: var(--ink);
    }

    .review-author span {
      display: block;
      font-size: 0.75rem;
      color: var(--muted);
    }

    /* FAQ */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .faq-item {
      background: var(--surface);
      border-radius: var(--radius-sm);
      border: 1px solid var(--border);
      overflow: hidden;
      transition: border-color 0.2s;
    }

    .faq-item.open {
      border-color: var(--primary);
    }

    .faq-question {
      width: 100%;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      padding: 18px 22px;
      background: none;
      border: none;
      font-family: inherit;
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--ink);
      text-align: left;
      cursor: pointer;
      transition: background 0.2s;
    }

    .faq-question:hover {
      background: #f8fafc;
    }

    .faq-question .plus {
      flex-shrink: 0;
      width: 24px;
      height: 24px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1rem;
      font-weight: 700;
      transition: transform 0.3s, background 0.2s;
    }

    .faq-item.open .plus {
      transform: rotate(45deg);
      background: var(--primary);
      color: #fff;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
      padding: 0 22px;
    }

    .faq-item.open .faq-answer {
      max-height: 320px;
      padding: 0 22px 18px;
    }

    .faq-answer p {
      font-size: 0.875rem;
      color: var(--muted);
      line-height: 1.7;
    }

    /* 表单 */
    .form-section {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: start;
    }

    .form-info h2 {
      font-size: 1.75rem;
      font-weight: 800;
      letter-spacing: -0.02em;
      margin-bottom: 16px;
      color: var(--ink);
    }

    .form-info p {
      font-size: 0.95rem;
      color: var(--muted);
      line-height: 1.7;
      margin-bottom: 24px;
    }

    .contact-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .contact-list li {
      display: flex;
      gap: 12px;
      align-items: flex-start;
      font-size: 0.9rem;
      color: var(--ink-soft);
    }

    .contact-list .dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--primary);
      flex-shrink: 0;
      margin-top: 8px;
    }

    .contact-list strong {
      color: var(--ink);
      font-weight: 600;
    }

    .form-card {
      background: var(--surface);
      border-radius: var(--radius);
      padding: 32px 28px;
      border: 1px solid var(--border);
      box-shadow: var(--shadow);
    }

    .form-card h3 {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 20px;
      color: var(--ink);
    }

    .form-group {
      margin-bottom: 16px;
    }

    .form-group label {
      display: block;
      font-size: 0.8rem;
      font-weight: 600;
      color: var(--ink-soft);
      margin-bottom: 6px;
    }

    .form-group input,
    .form-group select,
    .form-group textarea {
      width: 100%;
      padding: 11px 14px;
      border: 1px solid var(--border);
      border-radius: 10px;
      font-family: inherit;
      font-size: 0.9rem;
      color: var(--ink);
      background: #f8fafc;
      transition: border-color 0.2s, box-shadow 0.2s;
      outline: none;
    }

    .form-group input:focus,
    .form-group select:focus,
    .form-group textarea:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
      background: #fff;
    }

    .form-group textarea {
      min-height: 100px;
      resize: vertical;
    }

    .form-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 14px;
    }

    .form-submit {
      width: 100%;
      padding: 13px;
      font-size: 0.95rem;
      margin-top: 6px;
    }

    /* 文章 & 标签云 */
    .article-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
    }

    .article-card {
      background: var(--surface);
      border-radius: var(--radius-sm);
      padding: 22px 24px;
      border: 1px solid var(--border);
      transition: transform 0.25s, box-shadow 0.25s;
      display: flex;
      flex-direction: column;
    }

    .article-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-hover);
    }

    .article-card h3 {
      font-size: 0.95rem;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--ink);
      line-height: 1.45;
    }

    .article-card p {
      font-size: 0.8rem;
      color: var(--muted);
      line-height: 1.6;
      flex: 1;
    }

    .article-link {
      margin-top: 14px;
      font-size: 0.8rem;
      font-weight: 600;
      color: var(--primary);
      display: inline-flex;
      align-items: center;
      gap: 4px;
      transition: gap 0.2s;
    }

    .article-card:hover .article-link {
      gap: 8px;
    }

    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 32px;
    }

    .tag-cloud span {
      display: inline-block;
      font-size: 0.78rem;
      padding: 6px 16px;
      border-radius: 999px;
      background: var(--surface);
      border: 1px solid var(--border);
      color: var(--ink-soft);
      transition: background 0.2s, border-color 0.2s, transform 0.2s;
      cursor: default;
    }

    .tag-cloud span:hover {
      background: var(--primary-light);
      border-color: var(--primary);
      color: var(--primary-dark);
      transform: translateY(-2px);
    }

    /* 服务网络 */
    .network-row {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    /* 价格参考 */
    .price-row {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .price-card {
      background: var(--surface);
      border-radius: var(--radius-sm);
      padding: 28px 24px;
      border: 1px solid var(--border);
      transition: transform 0.25s, box-shadow 0.25s;
      position: relative;
    }

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

    .price-card.featured {
      border-color: var(--primary);
      box-shadow: 0 8px 24px -8px rgba(37, 99, 235, 0.2);
    }

    .price-card .price-tag {
      font-size: 0.7rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.08em;
      color: var(--primary);
      margin-bottom: 10px;
    }

    .price-card .price-value {
      font-size: 1.5rem;
      font-weight: 800;
      color: var(--ink);
      letter-spacing: -0.02em;
      margin-bottom: 6px;
    }

    .price-card .price-desc {
      font-size: 0.8rem;
      color: var(--muted);
      margin-bottom: 18px;
      line-height: 1.55;
    }

    .price-card ul {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .price-card li {
      font-size: 0.82rem;
      color: var(--ink-soft);
      display: flex;
      gap: 8px;
      align-items: flex-start;
    }

    .price-card li::before {
      content: "✓";
      color: var(--primary);
      font-weight: 700;
      flex-shrink: 0;
    }

    /* 页脚 */
    .site-footer {
      background: #0f172a;
      color: #cbd5e1;
      padding: 52px 0 24px;
      margin-top: 0;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
      gap: 32px;
      margin-bottom: 36px;
    }

    .footer-brand {
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .footer-brand .brand {
      color: #fff;
      font-size: 1.05rem;
    }

    .footer-brand .brand .logo {
      width: 36px;
    }

    .footer-brand p {
      font-size: 0.82rem;
      color: #94a3b8;
      line-height: 1.7;
    }

    .footer-col h4 {
      font-size: 0.82rem;
      font-weight: 700;
      color: #fff;
      margin-bottom: 16px;
      letter-spacing: 0.03em;
    }

    .footer-col ul {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 9px;
    }

    .footer-col a {
      font-size: 0.82rem;
      color: #94a3b8;
      transition: color 0.2s;
    }

    .footer-col a:hover {
      color: #fff;
    }

    .footer-contact-item {
      font-size: 0.82rem;
      color: #94a3b8;
      margin-bottom: 9px;
      line-height: 1.5;
    }

    .footer-contact-item strong {
      color: #cbd5e1;
      font-weight: 600;
    }

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 20px;
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      align-items: center;
      gap: 12px;
    }

    .footer-bottom p {
      font-size: 0.78rem;
      color: #64748b;
    }

    .footer-links {
      display: flex;
      flex-wrap: wrap;
      gap: 18px;
    }

    .footer-links a {
      font-size: 0.78rem;
      color: #94a3b8;
      transition: color 0.2s;
    }

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

    /* 浮动客服 */
    .float-service {
      position: fixed;
      right: 20px;
      bottom: 24px;
      z-index: 90;
      display: flex;
      flex-direction: column;
      gap: 10px;
      align-items: flex-end;
    }

    .float-btn {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: var(--primary);
      color: #fff;
      border: none;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.3rem;
      box-shadow: 0 8px 20px -4px rgba(37, 99, 235, 0.4);
      transition: transform 0.2s, background 0.2s;
      position: relative;
    }

    .float-btn:hover {
      transform: scale(1.08);
      background: var(--primary-dark);
    }

    .float-pop {
      position: absolute;
      right: 60px;
      bottom: 0;
      background: #fff;
      border-radius: 14px;
      padding: 16px;
      box-shadow: 0 16px 40px -12px rgba(0, 0, 0, 0.2);
      border: 1px solid var(--border);
      width: 200px;
      display: none;
      flex-direction: column;
      gap: 10px;
      z-index: 95;
    }

    .float-pop.show {
      display: flex;
    }

    .float-pop p {
      font-size: 0.8rem;
      color: var(--ink-soft);
      line-height: 1.5;
    }

    .float-pop img {
      width: 100%;
      border-radius: 10px;
      border: 1px solid var(--border);
    }

    .back-top {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #fff;
      color: var(--ink-soft);
      border: 1px solid var(--border);
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1rem;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
      transition: transform 0.2s, background 0.2s;
      opacity: 0;
      pointer-events: none;
      transform: translateY(10px);
    }

    .back-top.show {
      opacity: 1;
      pointer-events: auto;
      transform: translateY(0);
    }

    .back-top:hover {
      background: var(--primary-light);
      color: var(--primary);
    }

    /* 滚动渐入 */
    .reveal {
      opacity: 0;
      transform: translateY(22px);
      transition: opacity 0.6s ease, transform 0.6s ease;
    }

    .reveal.visible {
      opacity: 1;
      transform: translateY(0);
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 36px;
      }

      .hero-visual {
        flex-direction: row;
        flex-wrap: wrap;
      }

      .hero-card {
        flex: 1 1 220px;
      }

      .hero-card:nth-child(2) {
        margin-left: 0;
      }

      .hero-card:nth-child(3) {
        margin-right: 0;
      }

      .services-grid {
        grid-template-columns: repeat(2, 1fr);
      }

      .process-grid {
        grid-template-columns: repeat(2, 1fr);
      }

      .reviews-grid {
        grid-template-columns: repeat(2, 1fr);
      }

      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }

      .form-section {
        grid-template-columns: 1fr;
        gap: 32px;
      }
    }

    @media (max-width: 860px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: #fff;
        flex-direction: column;
        align-items: stretch;
        padding: 12px 16px 18px;
        box-shadow: 0 16px 30px -10px rgba(0, 0, 0, 0.1);
        border-bottom: 1px solid var(--border);
        gap: 4px;
      }

      .nav-links.open {
        display: flex;
      }

      .menu-toggle {
        display: flex;
      }

      .nav-cta .btn {
        display: none;
      }

      .stats-row {
        grid-template-columns: repeat(2, 1fr);
      }

      .price-row {
        grid-template-columns: 1fr;
      }

      .network-row {
        grid-template-columns: 1fr;
      }

      .case-grid {
        grid-template-columns: 1fr;
      }

      .article-grid {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 640px) {
      .container {
        padding: 0 16px;
      }

      .hero {
        padding: 48px 0 40px;
      }

      .hero h1 {
        font-size: 1.75rem;
      }

      .hero-desc {
        font-size: 0.95rem;
      }

      .hero-actions {
        flex-direction: column;
        align-items: stretch;
      }

      .hero-actions .btn {
        justify-content: center;
      }

      .hero-stats {
        gap: 20px;
      }

      .hero-stat strong {
        font-size: 1.25rem;
      }

      .section {
        padding: 44px 0;
      }

      .services-grid {
        grid-template-columns: 1fr;
      }

      .process-grid {
        grid-template-columns: 1fr;
      }

      .reviews-grid {
        grid-template-columns: 1fr;
      }

      .stats-row {
        grid-template-columns: 1fr;
      }

      .footer-grid {
        grid-template-columns: 1fr;
        gap: 24px;
      }

      .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
      }

      .form-row {
        grid-template-columns: 1fr;
      }

      .hero-visual {
        flex-direction: column;
      }

      .float-service {
        right: 12px;
        bottom: 16px;
      }
    }