:root {
      --primary: #059669;
      --primary-hover: #047857;
      --primary-light: #ecfdf5;
      --primary-border: #a7f3d0;
      --accent: #10b981;
      --accent-glow: rgba(16, 185, 129, 0.15);
      --bg-page: #f8fafc;
      --bg-card: #ffffff;
      --bg-card-subtle: #f0fdf4;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-soft: #64748b;
      --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-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
      --shadow-hover: 0 20px 25px -5px rgba(5, 150, 105, 0.12), 0 8px 10px -6px rgba(5, 150, 105, 0.08);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 18px;
      --radius-full: 9999px;
      --container-max: 1200px;
    }

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

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
    }

    body {
      overflow-x: hidden;
      background: radial-gradient(circle at 10% 20%, rgba(16, 185, 129, 0.03) 0%, transparent 40%),
                  radial-gradient(circle at 90% 80%, rgba(5, 150, 105, 0.03) 0%, transparent 40%),
                  var(--bg-page);
      min-height: 100vh;
      display: flex;
      flex-direction: column;
    }

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

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      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: 76px;
    }
    .brand-area {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
    }
    .ai-page-logo {
      height: 42px;
      width: auto;
      object-fit: contain;
    }
    .brand-text {
      font-size: 20px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.5px;
    }
    .nav-menu {
      display: flex;
      align-items: center;
    }
    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 0;
    }
    .nav-links li a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 14px;
      font-weight: 500;
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      transition: all 0.2s ease;
      display: inline-block;
    }
    .nav-links li a:hover,
    .nav-links li a.active {
      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 20px;
      font-size: 14px;
      font-weight: 600;
      border-radius: var(--radius-sm);
      text-decoration: none;
      cursor: pointer;
      transition: all 0.25s ease;
      border: 1px solid transparent;
      line-height: 1.4;
      white-space: nowrap;
    }
    .btn-primary {
      background-color: var(--primary);
      color: #ffffff !important;
      box-shadow: 0 4px 12px rgba(5, 150, 105, 0.25);
    }
    .btn-primary:hover {
      background-color: var(--primary-hover);
      box-shadow: 0 6px 16px rgba(5, 150, 105, 0.35);
      transform: translateY(-1px);
    }
    .btn-outline {
      background-color: #ffffff;
      color: var(--primary);
      border-color: var(--primary);
    }
    .btn-outline:hover {
      background-color: var(--primary-light);
      border-color: var(--primary-hover);
      color: var(--primary-hover);
    }
    .btn-sm {
      padding: 6px 14px;
      font-size: 13px;
    }
    .menu-toggle {
      display: none;
      background: none;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      padding: 8px;
      cursor: pointer;
      color: var(--text-main);
    }

    /* 模块通用样式 */
    .section {
      padding: 72px 0;
      position: relative;
    }
    .section-alt {
      background-color: #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 48px auto;
    }
    .section-tag {
      display: inline-block;
      font-size: 12px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: var(--primary);
      background-color: var(--primary-light);
      padding: 4px 12px;
      border-radius: var(--radius-full);
      margin-bottom: 12px;
      border: 1px solid var(--primary-border);
    }
    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
      line-height: 1.3;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 首屏 Hero */
    .hero-section {
      padding: 80px 0 60px 0;
      text-align: center;
      position: relative;
      overflow: hidden;
      background: linear-gradient(180deg, #ecfdf5 0%, rgba(248, 250, 252, 0) 100%);
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #ffffff;
      border: 1px solid var(--primary-border);
      padding: 6px 16px;
      border-radius: var(--radius-full);
      font-size: 13px;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
    }
    .hero-badge-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background-color: var(--accent);
      animation: pulse 2s infinite;
    }
    @keyframes pulse {
      0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
      70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
      100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
    }
    .hero-title {
      font-size: 42px;
      font-weight: 900;
      line-height: 1.25;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-title span {
      color: var(--primary);
      background: linear-gradient(120deg, #059669, #10b981);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-lead {
      font-size: 18px;
      color: var(--text-muted);
      max-width: 820px;
      margin: 0 auto 36px auto;
      line-height: 1.7;
    }
    .hero-actions {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 16px;
      margin-bottom: 48px;
      flex-wrap: wrap;
    }
    .hero-btn-main {
      font-size: 16px;
      padding: 14px 32px;
      border-radius: var(--radius-md);
      box-shadow: 0 8px 20px rgba(5, 150, 105, 0.3);
    }
    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      max-width: 1000px;
      margin: 0 auto;
    }
    .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: all 0.3s ease;
    }
    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: var(--primary-border);
    }
    .stat-value {
      font-size: 30px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
      line-height: 1;
    }
    .stat-label {
      font-size: 13px;
      color: var(--text-soft);
      font-weight: 500;
    }

    /* 网格与通用卡片 */
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .card {
      background-color: var(--bg-card);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
    }
    .card:hover {
      border-color: var(--primary-border);
      box-shadow: var(--shadow-hover);
      transform: translateY(-3px);
    }
    .card-icon {
      width: 44px;
      height: 44px;
      border-radius: var(--radius-sm);
      background-color: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      margin-bottom: 16px;
    }
    .card-title {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }
    .card-text {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    /* 平台介绍与模型标签 */
    .models-chip-container {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 20px;
    }
    .model-chip {
      background: #ffffff;
      border: 1px solid var(--border-color);
      color: var(--text-main);
      padding: 6px 12px;
      border-radius: var(--radius-sm);
      font-size: 12px;
      font-weight: 600;
      transition: all 0.2s;
    }
    .model-chip:hover {
      border-color: var(--primary);
      color: var(--primary);
      background-color: var(--primary-light);
    }

    /* 图文混排与素材展示 */
    .media-card-group {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 24px;
      align-items: center;
      margin-top: 32px;
    }
    .media-box {
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      background-color: #ffffff;
      box-shadow: var(--shadow-sm);
    }
    .media-box img {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
    }
    .media-caption {
      padding: 16px;
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
      background: #ffffff;
      border-top: 1px solid var(--border-color);
    }

    /* 流程与步骤 */
    .process-timeline {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .process-step {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px 20px;
      position: relative;
      text-align: left;
    }
    .step-number {
      font-size: 32px;
      font-weight: 900;
      color: var(--primary-border);
      line-height: 1;
      margin-bottom: 12px;
    }
    .step-title {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }
    .step-desc {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 对比评测表格 */
    .comparison-container {
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-md);
    }
    .comparison-header-card {
      background: linear-gradient(135deg, var(--primary), #047857);
      color: #ffffff;
      padding: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
    }
    .score-badge {
      background: #ffffff;
      color: var(--primary);
      padding: 8px 18px;
      border-radius: var(--radius-full);
      font-size: 16px;
      font-weight: 800;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .table-wrapper {
      overflow-x: auto;
    }
    .table-custom {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 680px;
    }
    .table-custom th,
    .table-custom td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 14px;
    }
    .table-custom th {
      background-color: #f8fafc;
      color: var(--text-main);
      font-weight: 700;
    }
    .table-custom tr:last-child td {
      border-bottom: none;
    }
    .table-custom .highlight-col {
      background-color: var(--primary-light);
      font-weight: 600;
      color: var(--primary);
    }

    /* 评论卡片 */
    .testimonial-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;
    }
    .testimonial-quote {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
      font-style: normal;
    }
    .testimonial-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px dashed var(--border-color);
      padding-top: 12px;
    }
    .author-avatar {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 16px;
    }
    .author-name {
      font-size: 14px;
      font-weight: 700;
      color: var(--text-main);
    }
    .author-title {
      font-size: 12px;
      color: var(--text-soft);
    }

    /* 常见问题折叠面板 */
    .faq-list {
      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;
      transition: all 0.2s ease;
    }
    .faq-item.active {
      border-color: var(--primary);
    }
    .faq-question {
      padding: 18px 20px;
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }
    .faq-question:hover {
      color: var(--primary);
    }
    .faq-icon {
      font-size: 18px;
      transition: transform 0.3s ease;
      color: var(--primary);
    }
    .faq-item.active .faq-icon {
      transform: rotate(180deg);
    }
    .faq-answer {
      padding: 0 20px 18px 20px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }

    /* 表单与联络板块 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      padding: 40px;
      box-shadow: var(--shadow-md);
    }
    .form-group {
      margin-bottom: 20px;
    }
    .form-label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 8px;
      color: var(--text-main);
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      font-size: 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      outline: none;
      transition: border-color 0.2s;
      background-color: #f8fafc;
      font-family: inherit;
    }
    .form-control:focus {
      border-color: var(--primary);
      background-color: #ffffff;
    }
    textarea.form-control {
      resize: vertical;
      min-height: 110px;
    }
    .contact-info-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
      margin-top: 24px;
    }
    .contact-info-item {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      font-size: 14px;
      color: var(--text-muted);
    }
    .qr-box {
      margin-top: 20px;
      padding: 16px;
      background: var(--primary-light);
      border: 1px solid var(--primary-border);
      border-radius: var(--radius-md);
      display: inline-flex;
      flex-direction: column;
      align-items: center;
      gap: 8px;
    }
    .qr-box img {
      width: 120px;
      height: 120px;
      border-radius: var(--radius-sm);
      object-fit: cover;
    }

    /* 文章与外链 */
    .article-links-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
    }
    .article-item {
      background: #ffffff;
      padding: 16px 20px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
      text-decoration: none;
      color: var(--text-main);
      font-size: 14px;
      font-weight: 600;
      display: flex;
      align-items: center;
      justify-content: space-between;
      transition: all 0.2s;
    }
    .article-item:hover {
      border-color: var(--primary);
      color: var(--primary);
      transform: translateX(4px);
    }

    /* 友情链接与页脚 */
    .footer-section {
      background-color: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 48px 0 24px 0;
      margin-top: auto;
    }
    .footer-top {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 32px;
      padding-bottom: 32px;
      border-bottom: 1px solid var(--border-color);
    }
    .footer-brand p {
      font-size: 14px;
      color: var(--text-soft);
      margin-top: 12px;
      line-height: 1.6;
      max-width: 400px;
    }
    .footer-links-col h4 {
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 16px;
    }
    .footer-links-col ul {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-links-col ul li a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 13px;
      transition: color 0.2s;
    }
    .footer-links-col ul li a:hover {
      color: var(--primary);
    }
    .friend-links-area {
      padding: 20px 0;
      border-bottom: 1px solid var(--border-color);
      font-size: 13px;
      color: var(--text-soft);
    }
    .friend-links-area a {
      color: var(--text-muted);
      text-decoration: none;
      margin-right: 16px;
      display: inline-block;
      margin-bottom: 6px;
      transition: color 0.2s;
    }
    .friend-links-area a:hover {
      color: var(--primary);
    }
    .footer-bottom {
      padding-top: 24px;
      text-align: center;
      font-size: 13px;
      color: var(--text-soft);
    }

    /* 悬浮客服挂件 */
    .floating-widget {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 99;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .floating-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(5, 150, 105, 0.4);
      cursor: pointer;
      text-decoration: none;
      font-size: 20px;
      transition: all 0.3s ease;
      border: none;
    }
    .floating-btn:hover {
      transform: scale(1.08);
      background: var(--primary-hover);
    }

    /* 响应式适配 */
    @media (max-width: 1024px) {
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .process-timeline { grid-template-columns: repeat(2, 1fr); }
      .media-card-group { grid-template-columns: 1fr; }
      .hero-stats-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .header-inner { height: 64px; }
      .menu-toggle { display: block; }
      .nav-menu {
        position: absolute;
        top: 64px;
        left: 0;
        width: 100%;
        background: #ffffff;
        border-bottom: 1px solid var(--border-color);
        padding: 16px 24px;
        display: none;
        box-shadow: var(--shadow-md);
      }
      .nav-menu.show { display: block; }
      .nav-links {
        flex-direction: column;
        align-items: flex-start;
        width: 100%;
        gap: 8px;
      }
      .nav-links li { width: 100%; }
      .nav-links li a { width: 100%; }
      .header-actions { display: none; }
      .hero-title { font-size: 28px; }
      .hero-lead { font-size: 15px; }
      .grid-2, .grid-3 { grid-template-columns: 1fr; }
      .contact-wrapper { grid-template-columns: 1fr; padding: 24px; }
      .footer-top { grid-template-columns: 1fr; }
      .article-links-grid { grid-template-columns: 1fr; }
    }