:root {
      --primary: #4f46e5;
      --primary-hover: #4338ca;
      --primary-light: #eef2ff;
      --secondary: #06b6d4;
      --accent: #f59e0b;
      --text-main: #1e293b;
      --text-muted: #64748b;
      --bg-page: #f8fafc;
      --bg-card: #ffffff;
      --border-color: #e2e8f0;
      --border-focus: #818cf8;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
      --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
      --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.04);
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
      --max-width: 1200px;
      --transition: all 0.25s ease;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }

    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-page);
      color: var(--text-main);
      line-height: 1.65;
      overflow-x: hidden;
      min-width: 320px;
    }

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

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

    .container {
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-box {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .brand-logo-wrap {
      max-width: 140px;
      display: flex;
      align-items: center;
    }
    .nav-wrapper {
      display: flex;
      align-items: center;
      gap: 24px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 0;
    }
    .nav-links li a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-main);
      padding: 8px 12px;
      border-radius: var(--radius-sm);
    }
    .nav-links li a:hover {
      color: var(--primary);
      background-color: var(--primary-light);
    }
    .header-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: var(--radius-md);
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      text-align: center;
    }
    .btn-primary {
      background: linear-gradient(135deg, #4f46e5 0%, #06b6d4 100%);
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
    }
    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 16px rgba(79, 70, 229, 0.35);
      color: #ffffff;
    }
    .btn-outline {
      background: #ffffff;
      border-color: var(--border-color);
      color: var(--text-main);
    }
    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: var(--primary-light);
    }
    .btn-sm {
      padding: 6px 14px;
      font-size: 0.88rem;
    }
    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
      padding: 4px;
    }

    /* 区域通用规范 */
    .section-wrap {
      padding: 80px 0;
      position: relative;
    }
    .section-bg-alt {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }
    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 50px auto;
    }
    .section-tag {
      display: inline-block;
      padding: 4px 12px;
      font-size: 0.82rem;
      font-weight: 700;
      color: var(--primary);
      background: var(--primary-light);
      border-radius: 999px;
      margin-bottom: 12px;
      letter-spacing: 0.5px;
    }
    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
      letter-spacing: -0.5px;
    }
    .section-subtitle {
      font-size: 1.05rem;
      color: var(--text-muted);
    }

    /* 首屏 Hero (严格纯CSS无图片) */
    .hero-section {
      padding: 90px 0 70px 0;
      background: radial-gradient(circle at 80% 20%, rgba(6, 182, 212, 0.12) 0%, transparent 40%),
                  radial-gradient(circle at 10% 80%, rgba(79, 70, 229, 0.1) 0%, transparent 45%),
                  #ffffff;
      border-bottom: 1px solid var(--border-color);
      position: relative;
    }
    .hero-inner {
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      border-radius: 999px;
      background: linear-gradient(135deg, rgba(79, 70, 229, 0.08), rgba(6, 182, 212, 0.12));
      border: 1px solid rgba(79, 70, 229, 0.2);
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 24px;
    }
    .hero-title {
      font-size: 2.8rem;
      font-weight: 900;
      line-height: 1.25;
      color: #0f172a;
      max-width: 900px;
      margin-bottom: 20px;
      letter-spacing: -1px;
    }
    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 780px;
      margin-bottom: 36px;
      line-height: 1.75;
    }
    .hero-cta-group {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 16px;
      margin-bottom: 50px;
    }
    .btn-hero-portal {
      font-size: 1.1rem;
      padding: 14px 34px;
      box-shadow: 0 8px 20px rgba(79, 70, 229, 0.3);
    }
    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      width: 100%;
      max-width: 1000px;
      margin-top: 20px;
    }
    .stat-card {
      background: #ffffff;
      padding: 24px 16px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: var(--transition);
    }
    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--border-focus);
    }
    .stat-num {
      font-size: 2rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.1;
      margin-bottom: 6px;
    }
    .stat-label {
      font-size: 0.9rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 平台支持模型标签流 */
    .model-tags-wrap {
      margin-top: 40px;
      text-align: center;
      width: 100%;
    }
    .model-tags-title {
      font-size: 0.85rem;
      color: var(--text-muted);
      margin-bottom: 12px;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 1px;
    }
    .tags-container {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 8px;
    }
    .model-tag {
      font-size: 0.82rem;
      padding: 4px 12px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 999px;
      color: #334155;
      font-weight: 500;
      transition: var(--transition);
    }
    .model-tag:hover {
      background: var(--primary-light);
      border-color: var(--primary);
      color: var(--primary);
    }

    /* 卡片网格通用 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }

    .feature-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .feature-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-lg);
      border-color: var(--border-focus);
    }
    .feature-icon-badge {
      width: 46px;
      height: 46px;
      border-radius: var(--radius-sm);
      background: linear-gradient(135deg, rgba(79,70,229,0.1), rgba(6,182,212,0.15));
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 18px;
    }
    .feature-title {
      font-size: 1.2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }
    .feature-text {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 图文素材展示区 */
    .showcase-grid {
      display: grid;
      grid-template-columns: 1.2fr 1fr;
      gap: 30px;
      align-items: center;
    }
    .showcase-media-box {
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      background: #fff;
    }
    .showcase-media-box img {
      width: 100%;
      height: auto;
      object-fit: cover;
      display: block;
    }
    .banner-tri-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
      margin-top: 36px;
    }
    .banner-item-wrap {
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    /* 对比评测表格与评分卡片 */
    .eval-highlight-box {
      background: linear-gradient(135deg, #1e1b4b 0%, #0f172a 100%);
      color: #ffffff;
      border-radius: var(--radius-lg);
      padding: 36px 40px;
      margin-bottom: 36px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
    }
    .eval-score-area {
      display: flex;
      align-items: center;
      gap: 20px;
    }
    .score-big {
      font-size: 3.8rem;
      font-weight: 900;
      color: #38bdf8;
      line-height: 1;
    }
    .score-info h4 {
      font-size: 1.35rem;
      font-weight: 700;
      margin-bottom: 4px;
      color: #ffffff;
    }
    .score-stars {
      color: #f59e0b;
      font-size: 1.1rem;
      letter-spacing: 2px;
    }
    .table-container {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .eval-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 680px;
    }
    .eval-table th, .eval-table td {
      padding: 16px 20px;
      font-size: 0.95rem;
      border-bottom: 1px solid var(--border-color);
    }
    .eval-table th {
      background: #f1f5f9;
      font-weight: 700;
      color: var(--text-main);
    }
    .eval-table tr:last-child td {
      border-bottom: none;
    }
    .eval-table td.col-brand {
      font-weight: 700;
      color: var(--primary);
      background: var(--primary-light);
    }

    /* 流程步骤 */
    .steps-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .step-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px 20px;
      position: relative;
      box-shadow: var(--shadow-sm);
    }
    .step-num {
      position: absolute;
      top: -12px;
      left: 20px;
      background: var(--primary);
      color: #ffffff;
      width: 28px;
      height: 28px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.85rem;
      font-weight: 800;
    }
    .step-title {
      font-size: 1.1rem;
      font-weight: 700;
      margin: 12px 0 8px 0;
      color: var(--text-main);
    }

    /* 客户评价 */
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .review-text {
      font-size: 0.95rem;
      color: #475569;
      margin-bottom: 20px;
      line-height: 1.65;
    }
    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f1f5f9;
      padding-top: 14px;
    }
    .author-avatar-badge {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 0.95rem;
    }
    .author-meta h5 {
      font-size: 0.98rem;
      font-weight: 700;
      color: var(--text-main);
    }
    .author-meta p {
      font-size: 0.82rem;
      color: var(--text-muted);
    }

    /* FAQ 手风琴 */
    .faq-wrapper {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .faq-question {
      width: 100%;
      padding: 18px 22px;
      text-align: left;
      background: none;
      border: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 1.05rem;
      font-weight: 600;
      color: var(--text-main);
      cursor: pointer;
    }
    .faq-question:hover {
      color: var(--primary);
    }
    .faq-icon {
      font-size: 1.2rem;
      transition: transform 0.25s ease;
      color: var(--text-muted);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #f8fafc;
      border-top: 1px solid transparent;
    }
    .faq-answer-inner {
      padding: 18px 22px;
      font-size: 0.95rem;
      color: #475569;
      line-height: 1.7;
    }
    .faq-item.active .faq-answer {
      max-height: 300px;
      border-top-color: var(--border-color);
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
      color: var(--primary);
    }

    /* 表单与联系区 */
    .contact-container {
      display: grid;
      grid-template-columns: 1fr 1.3fr;
      gap: 36px;
      align-items: flex-start;
    }
    .contact-info-panel {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 32px;
      box-shadow: var(--shadow-sm);
    }
    .contact-info-title {
      font-size: 1.35rem;
      font-weight: 800;
      margin-bottom: 18px;
      color: var(--text-main);
    }
    .info-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 16px;
      margin-bottom: 24px;
    }
    .info-item {
      font-size: 0.95rem;
      color: var(--text-muted);
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .info-item strong {
      color: var(--text-main);
    }
    .qr-box-wrap {
      background: #f8fafc;
      padding: 16px;
      border-radius: var(--radius-md);
      text-align: center;
      border: 1px dashed var(--border-color);
    }
    .qr-box-wrap img {
      max-width: 140px;
      margin: 0 auto 10px auto;
      border-radius: var(--radius-sm);
    }

    .form-panel {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 36px;
      box-shadow: var(--shadow-sm);
    }
    .form-title {
      font-size: 1.35rem;
      font-weight: 800;
      margin-bottom: 8px;
    }
    .form-desc {
      font-size: 0.92rem;
      color: var(--text-muted);
      margin-bottom: 24px;
    }
    .form-group {
      margin-bottom: 18px;
    }
    .form-label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      margin-bottom: 6px;
      color: var(--text-main);
    }
    .form-control {
      width: 100%;
      padding: 12px 14px;
      font-size: 0.95rem;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      outline: none;
      transition: var(--transition);
      background: #ffffff;
      color: var(--text-main);
    }
    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
    }
    textarea.form-control {
      resize: vertical;
      min-height: 100px;
    }

    /* 文章列表 & 友情链接 */
    .article-box-list {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 16px;
      margin-top: 24px;
    }
    .article-card-item {
      background: #ffffff;
      padding: 16px 20px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-size: 0.92rem;
      font-weight: 500;
      transition: var(--transition);
    }
    .article-card-item:hover {
      border-color: var(--primary);
      color: var(--primary);
      transform: translateX(4px);
    }

    .friendly-links-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      padding: 24px 0 0 0;
      border-top: 1px solid var(--border-color);
      margin-top: 30px;
    }
    .friendly-links-wrap a {
      font-size: 0.88rem;
      color: var(--text-muted);
      background: #f1f5f9;
      padding: 6px 14px;
      border-radius: var(--radius-sm);
    }
    .friendly-links-wrap a:hover {
      color: var(--primary);
      background: var(--primary-light);
    }

    /* 页脚 */
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 50px 0 30px 0;
      font-size: 0.9rem;
      border-top: 1px solid #1e293b;
    }
    .footer-top {
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      align-items: center;
      gap: 20px;
      padding-bottom: 24px;
      border-bottom: 1px solid #334155;
    }
    .footer-brand {
      color: #ffffff;
      font-size: 1.25rem;
      font-weight: 800;
    }
    .footer-bottom {
      text-align: center;
      padding-top: 24px;
      font-size: 0.85rem;
    }

    /* 浮动操作栏 */
    .floating-tools {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .float-btn {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #ffffff;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--text-main);
      font-size: 1.1rem;
      cursor: pointer;
      transition: var(--transition);
    }
    .float-btn:hover {
      background: var(--primary);
      color: #ffffff;
      transform: scale(1.08);
    }

    /* 响应式媒体查询 */
    @media (max-width: 992px) {
      .hero-title { font-size: 2.2rem; }
      .hero-stats-grid { grid-template-columns: repeat(2, 1fr); }
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .steps-grid { grid-template-columns: repeat(2, 1fr); }
      .showcase-grid { grid-template-columns: 1fr; }
      .contact-container { grid-template-columns: 1fr; }
      .testimonials-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .header-inner { height: 60px; }
      .nav-links {
        display: none;
        position: absolute;
        top: 60px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 16px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-lg);
      }
      .nav-links.show { display: flex; }
      .nav-links li { width: 100%; }
      .nav-links li a { display: block; padding: 10px 14px; }
      .mobile-menu-toggle { display: block; }
      .hero-title { font-size: 1.85rem; }
      .section-title { font-size: 1.65rem; }
      .grid-3, .grid-4, .grid-2, .steps-grid, .banner-tri-grid { grid-template-columns: 1fr; }
      .eval-highlight-box { padding: 24px; text-align: center; justify-content: center; }
      .eval-score-area { flex-direction: column; }
    }