:root {
      --primary: #4f46e5;
      --primary-light: #818cf8;
      --secondary: #ec4899;
      --accent: #06b6d4;
      --amber: #f59e0b;
      --emerald: #10b981;
      --bg-base: #f8fafc;
      --bg-surface: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --border-color: #e2e8f0;
      --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
      --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
      --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
      --radius-lg: 16px;
      --radius-md: 10px;
    }
    * {
      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-base);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.25s ease;
    }
    .main-container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
    }
    .brand-box {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .brand-logo-wrap {
      max-width: 140px;
      display: flex;
      align-items: center;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }
    .nav-links li a {
      font-size: 0.92rem;
      font-weight: 500;
      color: var(--text-muted);
      padding: 8px 12px;
      border-radius: 6px;
    }
    .nav-links li a:hover {
      color: var(--primary);
      background: rgba(79, 70, 229, 0.05);
    }
    .nav-btn-group {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      font-size: 0.95rem;
      padding: 10px 22px;
      border-radius: 9999px;
      cursor: pointer;
      border: 1px solid transparent;
      transition: all 0.25s ease;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(79, 70, 229, 0.35);
    }
    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(79, 70, 229, 0.45);
    }
    .btn-outline {
      background: #ffffff;
      color: var(--text-main);
      border-color: var(--border-color);
    }
    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: rgba(79, 70, 229, 0.04);
    }
    .mobile-menu-toggle {
      display: none;
      background: transparent;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
      padding: 4px;
    }
    .hero-section {
      position: relative;
      padding: 80px 0 70px 0;
      background: radial-gradient(circle at 10% 20%, rgba(236, 72, 153, 0.08) 0%, transparent 40%),
                  radial-gradient(circle at 90% 80%, rgba(6, 182, 212, 0.1) 0%, transparent 45%),
                  radial-gradient(circle at 50% 50%, rgba(79, 70, 229, 0.06) 0%, transparent 60%);
      text-align: center;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: linear-gradient(90deg, rgba(79, 70, 229, 0.1), rgba(236, 72, 153, 0.1));
      border: 1px solid rgba(79, 70, 229, 0.2);
      padding: 6px 18px;
      border-radius: 9999px;
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 24px;
    }
    .hero-title {
      font-size: 2.8rem;
      font-weight: 800;
      letter-spacing: -0.02em;
      line-height: 1.25;
      margin-bottom: 20px;
      color: var(--text-main);
    }
    .hero-title span {
      background: linear-gradient(135deg, #4f46e5 0%, #ec4899 50%, #06b6d4 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 780px;
      margin: 0 auto 36px auto;
      line-height: 1.7;
    }
    .hero-actions {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      margin-bottom: 48px;
      flex-wrap: wrap;
    }
    .hero-actions .btn-official {
      padding: 14px 36px;
      font-size: 1.05rem;
      box-shadow: 0 10px 25px -5px rgba(236, 72, 153, 0.4);
    }
    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 20px;
    }
    .metric-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      padding: 24px 16px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s ease, box-shadow 0.25s ease;
    }
    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(79, 70, 229, 0.3);
    }
    .metric-num {
      font-size: 2rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }
    .metric-label {
      font-size: 0.88rem;
      color: var(--text-muted);
      font-weight: 500;
    }
    .section-wrap {
      padding: 70px 0;
      position: relative;
    }
    .section-head {
      text-align: center;
      max-width: 720px;
      margin: 0 auto 48px auto;
    }
    .section-tag {
      display: inline-block;
      font-size: 0.8rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      padding: 4px 12px;
      border-radius: 9999px;
      background: rgba(79, 70, 229, 0.1);
      color: var(--primary);
      margin-bottom: 12px;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 14px;
    }
    .section-subtitle {
      font-size: 1rem;
      color: var(--text-muted);
      line-height: 1.6;
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .service-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 28px 24px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .service-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-xl);
      border-color: rgba(6, 182, 212, 0.4);
    }
    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      font-size: 1.25rem;
      font-weight: 700;
      color: #ffffff;
    }
    .icon-grad-1 { background: linear-gradient(135deg, #4f46e5, #818cf8); }
    .icon-grad-2 { background: linear-gradient(135deg, #ec4899, #f43f5e); }
    .icon-grad-3 { background: linear-gradient(135deg, #06b6d4, #3b82f6); }
    .icon-grad-4 { background: linear-gradient(135deg, #f59e0b, #d97706); }
    .icon-grad-5 { background: linear-gradient(135deg, #10b981, #059669); }
    .icon-grad-6 { background: linear-gradient(135deg, #8b5cf6, #ec4899); }
    .service-card h3 {
      font-size: 1.2rem;
      font-weight: 600;
      margin-bottom: 10px;
      color: var(--text-main);
    }
    .service-card p {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 18px;
    }
    .card-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
    }
    .card-tags span {
      background: #f1f5f9;
      color: #334155;
      font-size: 0.75rem;
      font-weight: 500;
      padding: 3px 8px;
      border-radius: 4px;
    }
    .models-cloud {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 32px;
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      align-items: center;
      justify-content: center;
    }
    .model-chip {
      background: #f8fafc;
      border: 1px solid #cbd5e1;
      padding: 8px 16px;
      border-radius: 9999px;
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--text-main);
      transition: all 0.2s ease;
    }
    .model-chip:hover {
      background: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
      transform: scale(1.05);
    }
    .process-flow {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .process-step {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      text-align: center;
      position: relative;
    }
    .step-badge {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      margin: 0 auto 16px auto;
    }
    .process-step h4 {
      font-size: 1.05rem;
      margin-bottom: 8px;
    }
    .process-step p {
      font-size: 0.88rem;
      color: var(--text-muted);
    }
    .comparison-container {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-sm);
    }
    .rating-banner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: linear-gradient(90deg, rgba(79, 70, 229, 0.06), rgba(236, 72, 153, 0.06));
      border-radius: var(--radius-md);
      padding: 20px 24px;
      margin-bottom: 24px;
      border-left: 5px solid var(--primary);
      flex-wrap: wrap;
      gap: 12px;
    }
    .rating-badge {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-main);
    }
    .rating-score {
      font-size: 1.6rem;
      font-weight: 800;
      color: #ef4444;
    }
    .table-responsive {
      overflow-x: auto;
    }
    .data-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }
    .data-table th, .data-table td {
      padding: 14px 18px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.92rem;
    }
    .data-table th {
      background: #f8fafc;
      color: var(--text-main);
      font-weight: 600;
    }
    .data-table tr:hover td {
      background: rgba(79, 70, 229, 0.02);
    }
    .highlight-col {
      color: var(--primary);
      font-weight: 600;
    }
    .media-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .media-card-img-wrap {
      width: 100%;
      background: #e2e8f0;
      overflow: hidden;
    }
    .media-card-img-wrap img {
      width: 100%;
      height: auto;
      display: block;
      transition: transform 0.3s ease;
    }
    .media-card:hover .media-card-img-wrap img {
      transform: scale(1.03);
    }
    .media-card-body {
      padding: 20px;
    }
    .media-card-body h4 {
      font-size: 1.05rem;
      margin-bottom: 8px;
    }
    .media-card-body p {
      font-size: 0.88rem;
      color: var(--text-muted);
    }
    .faq-list {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .faq-item {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: border-color 0.2s;
    }
    .faq-item:hover {
      border-color: var(--primary-light);
    }
    .faq-question {
      width: 100%;
      background: transparent;
      border: none;
      padding: 18px 22px;
      text-align: left;
      font-size: 1rem;
      font-weight: 600;
      color: var(--text-main);
      display: flex;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-question .faq-icon {
      font-size: 1.25rem;
      color: var(--primary);
      transition: transform 0.3s ease;
    }
    .faq-answer {
      display: none;
      padding: 0 22px 18px 22px;
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }
    .review-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }
    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }
    .author-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1rem;
    }
    .author-name {
      font-weight: 600;
      font-size: 0.95rem;
    }
    .author-role {
      font-size: 0.8rem;
      color: var(--text-muted);
    }
    .review-text {
      font-size: 0.9rem;
      color: #334155;
      line-height: 1.6;
      position: relative;
    }
    .form-container {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-md);
    }
    .form-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 18px;
      margin-bottom: 20px;
    }
    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }
    .form-group.full-width {
      grid-column: span 2;
    }
    .form-group label {
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--text-main);
    }
    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 0.92rem;
      background: #f8fafc;
      transition: border-color 0.2s ease, box-shadow 0.2s ease;
    }
    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
    }
    textarea.form-control {
      resize: vertical;
      min-height: 100px;
    }
    .site-footer {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 50px 0 30px 0;
      color: var(--text-main);
    }
    .footer-top {
      display: grid;
      grid-template-columns: 2fr 1fr 1.2fr 1.5fr;
      gap: 30px;
      margin-bottom: 40px;
    }
    .footer-col h5 {
      font-size: 1rem;
      font-weight: 600;
      margin-bottom: 16px;
      color: var(--text-main);
    }
    .footer-col p {
      font-size: 0.88rem;
      color: var(--text-muted);
      margin-bottom: 8px;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    .footer-links a {
      font-size: 0.88rem;
      color: var(--text-muted);
    }
    .footer-links a:hover {
      color: var(--primary);
    }
    .friend-links-box {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }
    .friend-links-box a {
      font-size: 0.85rem;
      color: var(--text-muted);
      background: #f1f5f9;
      padding: 4px 10px;
      border-radius: 6px;
    }
    .friend-links-box a:hover {
      background: var(--primary);
      color: #ffffff;
    }
    .footer-bottom {
      border-top: 1px solid var(--border-color);
      padding-top: 24px;
      text-align: center;
      font-size: 0.85rem;
      color: var(--text-muted);
    }
    .float-widget {
      position: fixed;
      right: 20px;
      bottom: 24px;
      z-index: 990;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--primary);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
      cursor: pointer;
      border: none;
      font-size: 1.2rem;
      transition: transform 0.2s;
    }
    .float-btn:hover {
      transform: scale(1.1);
    }
    .qr-popup {
      position: absolute;
      right: 60px;
      bottom: 0;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 12px;
      box-shadow: var(--shadow-xl);
      display: none;
      width: 140px;
      text-align: center;
    }
    .qr-popup img {
      width: 100%;
      height: auto;
      display: block;
    }
    .qr-popup span {
      display: block;
      font-size: 0.75rem;
      color: var(--text-muted);
      margin-top: 6px;
    }
    .float-item-kefu:hover .qr-popup {
      display: block;
    }
    .back-top {
      background: #475569;
      display: none;
    }
    @media (max-width: 1024px) {
      .grid-3, .reviews-grid { grid-template-columns: repeat(2, 1fr); }
      .grid-4, .hero-metrics, .process-flow { grid-template-columns: repeat(2, 1fr); }
      .footer-top { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .hero-title { font-size: 2rem; }
      .nav-links {
        display: none;
        position: absolute;
        top: 76px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 16px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active { display: flex; }
      .mobile-menu-toggle { display: block; }
      .nav-btn-group .btn-outline { display: none; }
      .grid-3, .grid-2, .grid-4, .reviews-grid, .hero-metrics, .process-flow { grid-template-columns: 1fr; }
      .form-grid { grid-template-columns: 1fr; }
      .form-group.full-width { grid-column: span 1; }
      .footer-top { grid-template-columns: 1fr; }
      .rating-banner { flex-direction: column; align-items: flex-start; }
    }