:root {
      --primary: #0284c7;
      --primary-hover: #0369a1;
      --accent: #f97316;
      --accent-hover: #ea580c;
      --text-dark: #0f172a;
      --text-muted: #475569;
      --bg-light: #f8fafc;
      --card-bg: #ffffff;
      --border-color: #e2e8f0;
      --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.05);
      --shadow-md: 0 10px 25px -5px rgba(2, 132, 199, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
      --shadow-hover: 0 20px 30px -10px rgba(2, 132, 199, 0.15);
      --radius: 14px;
      --container-width: 1200px;
    }

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

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.6;
    }

    body {
      background: linear-gradient(180deg, #f0fdf4 0%, #f8fafc 15%, #ffffff 100%);
      color: var(--text-dark);
      min-height: 100vh;
      overflow-x: hidden;
    }

    .container {
      width: 100%;
      max-width: var(--container-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, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .nav-wrapper {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .brand-area {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
    }

    .brand-area .ai-page-logo {
      height: 38px;
      width: auto;
      display: block;
    }

    .brand-name {
      font-size: 20px;
      font-weight: 800;
      color: var(--text-dark);
      letter-spacing: -0.5px;
    }

    .brand-tag {
      background: #e0f2fe;
      color: var(--primary);
      font-size: 11px;
      font-weight: 700;
      padding: 2px 8px;
      border-radius: 20px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }

    .nav-links li a,
    .nav-links li .ai-page-home-link {
      display: inline-block;
      padding: 8px 12px;
      font-size: 14px;
      font-weight: 600;
      color: var(--text-muted);
      text-decoration: none;
      transition: color 0.2s ease;
    }

    .nav-links li a:hover,
    .nav-links li .ai-page-home-link:hover {
      color: var(--primary);
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 20px;
      border-radius: 8px;
      font-size: 14px;
      font-weight: 700;
      text-decoration: none;
      cursor: pointer;
      transition: all 0.25s ease;
      border: 1px solid transparent;
      white-space: nowrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, #0284c7 0%, #0369a1 100%);
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(2, 132, 199, 0.3);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 16px rgba(2, 132, 199, 0.4);
      color: #ffffff;
    }

    .btn-accent {
      background: linear-gradient(135deg, #f97316 0%, #ea580c 100%);
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(249, 115, 22, 0.3);
    }

    .btn-accent:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 16px rgba(249, 115, 22, 0.4);
      color: #ffffff;
    }

    .btn-outline {
      background: #ffffff;
      color: var(--primary);
      border-color: #bae6fd;
    }

    .btn-outline:hover {
      background: #f0f9ff;
      border-color: var(--primary);
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--text-dark);
      padding: 4px;
    }

    /* 首屏 Hero 区域 (无图片) */
    .hero-section {
      padding: 64px 0 50px 0;
      background: radial-gradient(circle at 50% 10%, #e0f2fe 0%, #f8fafc 70%);
      border-bottom: 1px solid var(--border-color);
      position: relative;
    }

    .hero-content {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: #dbeafe;
      color: #1d4ed8;
      font-size: 13px;
      font-weight: 700;
      padding: 6px 16px;
      border-radius: 30px;
      margin-bottom: 20px;
      border: 1px solid #bfdbfe;
    }

    .hero-title {
      font-size: 38px;
      font-weight: 900;
      line-height: 1.3;
      color: #0f172a;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-subtitle {
      font-size: 18px;
      color: #475569;
      line-height: 1.6;
      margin-bottom: 32px;
    }

    .hero-buttons {
      display: flex;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 40px;
    }

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 20px;
    }

    .stat-card {
      background: #ffffff;
      padding: 20px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: transform 0.25s ease;
    }

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

    .stat-num {
      font-size: 26px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }

    .stat-label {
      font-size: 13px;
      color: var(--text-muted);
      font-weight: 600;
    }

    /* Section 通用规范 */
    .section-block {
      padding: 70px 0;
      border-bottom: 1px solid #edf2f7;
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 48px auto;
    }

    .section-tag {
      font-size: 13px;
      font-weight: 700;
      color: var(--primary);
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 8px;
      display: inline-block;
    }

    .section-title {
      font-size: 30px;
      font-weight: 800;
      color: var(--text-dark);
      margin-bottom: 14px;
    }

    .section-desc {
      font-size: 15px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 平台支持模型标签墙 */
    .model-tags-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 24px;
    }

    .model-chip {
      background: #ffffff;
      border: 1px solid #cbd5e1;
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      color: #334155;
      box-shadow: 0 1px 3px rgba(0,0,0,0.04);
      transition: all 0.2s ease;
    }

    .model-chip:hover {
      border-color: var(--primary);
      color: var(--primary);
      transform: scale(1.05);
    }

    /* 网格布局 */
    .cards-grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .cards-grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .cards-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);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
    }

    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: #bae6fd;
    }

    .feature-icon {
      width: 44px;
      height: 44px;
      background: #e0f2fe;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 10px;
      font-size: 20px;
      font-weight: bold;
      margin-bottom: 16px;
    }

    .feature-title {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 10px;
    }

    .feature-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    /* 流程步骤 */
    .steps-container {
      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);
      padding: 24px;
      text-align: center;
      position: relative;
    }

    .step-number {
      width: 36px;
      height: 36px;
      background: var(--primary);
      color: #ffffff;
      font-weight: 800;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px auto;
    }

    /* 媒体与案例展示 */
    .media-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .media-card-img-wrap {
      width: 100%;
      background: #f1f5f9;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .media-card-img-wrap img {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
    }

    .media-card-body {
      padding: 20px;
    }

    /* 对比评测表格 */
    .rating-badge-panel {
      background: linear-gradient(135deg, #0284c7 0%, #0369a1 100%);
      color: #ffffff;
      border-radius: var(--radius);
      padding: 28px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 30px;
    }

    .rating-score-box {
      display: flex;
      align-items: baseline;
      gap: 8px;
    }

    .score-big {
      font-size: 48px;
      font-weight: 900;
      line-height: 1;
    }

    .score-max {
      font-size: 20px;
      opacity: 0.9;
    }

    .comparison-table-wrapper {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow-x: auto;
      box-shadow: var(--shadow-sm);
    }

    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 650px;
    }

    .comparison-table th,
    .comparison-table td {
      padding: 16px 20px;
      border-bottom: 1px solid #f1f5f9;
      font-size: 14px;
    }

    .comparison-table th {
      background: #f8fafc;
      color: #334155;
      font-weight: 700;
    }

    .highlight-col {
      background: #f0fdf4;
      font-weight: 700;
      color: #166534;
    }

    /* Token 比价列表 */
    .token-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .token-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 20px;
      box-shadow: var(--shadow-sm);
    }

    .token-card-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 12px;
      border-bottom: 1px solid #f1f5f9;
      padding-bottom: 8px;
    }

    .token-name {
      font-weight: 700;
      color: var(--text-dark);
    }

    .token-price {
      font-size: 18px;
      font-weight: 800;
      color: var(--accent);
    }

    /* 用户评论 */
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .testimonial-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 22px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .testimonial-quote {
      font-size: 14px;
      color: #334155;
      line-height: 1.6;
      margin-bottom: 16px;
    }

    .testimonial-user {
      display: flex;
      align-items: center;
      gap: 10px;
      border-top: 1px solid #f8fafc;
      padding-top: 12px;
    }

    .user-avatar {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: #e2e8f0;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--primary);
    }

    .user-meta h4 {
      font-size: 14px;
      color: var(--text-dark);
    }

    .user-meta p {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* FAQ 展开组件 */
    .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: 10px;
      overflow: hidden;
      transition: border-color 0.2s ease;
    }

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

    .faq-question {
      padding: 16px 20px;
      width: 100%;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: none;
      border: none;
      text-align: left;
      font-size: 16px;
      font-weight: 700;
      color: var(--text-dark);
      cursor: pointer;
    }

    .faq-icon {
      font-size: 18px;
      font-weight: bold;
      color: var(--primary);
      transition: transform 0.25s ease;
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    .faq-answer {
      padding: 0 20px 16px 20px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      display: none;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    /* 表单与需求匹配 */
    .form-wrapper {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 36px;
      box-shadow: var(--shadow-md);
      max-width: 800px;
      margin: 0 auto;
    }

    .form-group-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      margin-bottom: 16px;
    }

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

    .form-group label {
      display: block;
      font-size: 14px;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 14px;
      color: var(--text-dark);
      background: #f8fafc;
      transition: border-color 0.2s ease;
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      background: #ffffff;
    }

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

    /* 行业资讯与短代码文章列表 */
    .article-links-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      margin-top: 20px;
    }

    .article-links-list {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
      gap: 12px;
      list-style: none;
      margin-top: 14px;
    }

    .article-links-list a {
      color: var(--primary);
      text-decoration: none;
      font-size: 14px;
      font-weight: 600;
      word-break: break-all;
    }

    .article-links-list a:hover {
      text-decoration: underline;
    }

    /* 友情链接与客服 */
    .links-footer-box {
      background: #f1f5f9;
      padding: 16px 20px;
      border-radius: 8px;
      margin-bottom: 24px;
    }

    .links-footer-box a {
      color: var(--text-muted);
      text-decoration: none;
      margin-right: 16px;
      font-size: 13px;
      display: inline-block;
      margin-bottom: 6px;
    }

    .links-footer-box a:hover {
      color: var(--primary);
    }

    /* 页脚 */
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 48px 0 24px 0;
      border-top: 1px solid #1e293b;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 32px;
      margin-bottom: 36px;
    }

    .footer-col h4 {
      color: #f8fafc;
      font-size: 16px;
      margin-bottom: 16px;
      font-weight: 700;
    }

    .footer-col p, .footer-col li {
      font-size: 13px;
      line-height: 1.8;
      list-style: none;
    }

    .footer-col a {
      color: #94a3b8;
      text-decoration: none;
      transition: color 0.2s;
    }

    .footer-col a:hover {
      color: #38bdf8;
    }

    .footer-qr-img {
      max-width: 110px;
      height: auto;
      border-radius: 6px;
      margin-top: 8px;
      background: #ffffff;
      padding: 4px;
    }

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 20px;
      text-align: center;
      font-size: 13px;
      color: #64748b;
    }

    /* 浮动客服入口 */
    .floating-contact {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      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 14px rgba(2, 132, 199, 0.4);
      text-decoration: none;
      font-size: 20px;
      transition: transform 0.2s;
    }

    .float-btn:hover {
      transform: scale(1.1);
    }

    /* 响应式适配 */
    @media (max-width: 992px) {
      .hero-title { font-size: 30px; }
      .hero-stats-grid { grid-template-columns: repeat(2, 1fr); }
      .cards-grid-3 { grid-template-columns: repeat(2, 1fr); }
      .cards-grid-4 { grid-template-columns: repeat(2, 1fr); }
      .steps-container { grid-template-columns: repeat(2, 1fr); }
      .testimonials-grid { grid-template-columns: 1fr; }
      .token-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        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; }
      .hero-title { font-size: 24px; }
      .hero-subtitle { font-size: 15px; }
      .cards-grid-3, .cards-grid-4, .cards-grid-2 { grid-template-columns: 1fr; }
      .steps-container { grid-template-columns: 1fr; }
      .token-grid { grid-template-columns: 1fr; }
      .form-group-row { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .rating-badge-panel { flex-direction: column; text-align: center; gap: 16px; }
    }