:root {
      --primary: #2563eb;
      --primary-hover: #1d4ed8;
      --accent: #0ea5e9;
      --accent-warm: #f59e0b;
      --success: #10b981;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --bg-page: #f8fafc;
      --bg-card: #ffffff;
      --border-color: #e2e8f0;
      --border-focus: #3b82f6;
      --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
      --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.04);
      --shadow-lg: 0 12px 24px -4px rgba(37, 99, 235, 0.08), 0 6px 12px -6px rgba(0, 0, 0, 0.04);
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
      --container-max: 1200px;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-tap-highlight-color: transparent;
    }

    html {
      scroll-behavior: smooth;
      font-size: 16px;
      background-color: var(--bg-page);
      color: var(--text-main);
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
      line-height: 1.6;
    }

    body {
      min-height: 100vh;
      display: flex;
      flex-direction: column;
      background: radial-gradient(circle at 15% 15%, rgba(37, 99, 235, 0.04), transparent 45%),
                  radial-gradient(circle at 85% 65%, rgba(14, 165, 233, 0.04), transparent 50%),
                  #f8fafc;
      overflow-x: hidden;
    }

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

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.94);
      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;
    }

    .logo-box {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
      color: var(--text-main);
    }

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

    .brand-title {
      font-size: 1.25rem;
      font-weight: 700;
      letter-spacing: -0.02em;
      color: var(--primary);
    }

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

    .nav-links li a {
      display: inline-block;
      padding: 8px 14px;
      color: var(--text-muted);
      text-decoration: none;
      font-size: 0.95rem;
      font-weight: 500;
      transition: color 0.2s ease, background-color 0.2s ease;
      border-radius: var(--radius-sm);
    }

    .nav-links li a:hover,
    .nav-links li a:focus {
      color: var(--primary);
      background-color: rgba(37, 99, 235, 0.06);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 9px 20px;
      border-radius: var(--radius-md);
      font-size: 0.95rem;
      font-weight: 600;
      text-decoration: none;
      cursor: pointer;
      transition: all 0.25s ease;
      border: 1px solid transparent;
      outline: none;
    }

    .btn-primary {
      background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
      color: #ffffff !important;
      box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, #1d4ed8 0%, #1e40af 100%);
      transform: translateY(-1px);
      box-shadow: 0 6px 16px rgba(37, 99, 235, 0.35);
    }

    .btn-secondary {
      background: #ffffff;
      color: var(--primary);
      border-color: #cbd5e1;
    }

    .btn-secondary:hover {
      background: #f1f5f9;
      border-color: var(--primary);
      color: var(--primary-hover);
    }

    .nav-toggle {
      display: none;
      flex-direction: column;
      justify-content: center;
      gap: 5px;
      background: transparent;
      border: none;
      width: 36px;
      height: 36px;
      cursor: pointer;
      padding: 4px;
    }

    .nav-toggle span {
      display: block;
      width: 100%;
      height: 2px;
      background: var(--text-main);
      border-radius: 2px;
      transition: transform 0.2s, opacity 0.2s;
    }

    /* 区域通用规范 */
    section {
      padding: 64px 0;
      position: relative;
    }

    .section-head {
      text-align: center;
      margin-bottom: 44px;
      max-width: 760px;
      margin-left: auto;
      margin-right: auto;
    }

    .badge-pill {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 4px 14px;
      background-color: rgba(37, 99, 235, 0.08);
      color: var(--primary);
      font-size: 0.825rem;
      font-weight: 700;
      border-radius: 9999px;
      text-transform: uppercase;
      margin-bottom: 12px;
      border: 1px solid rgba(37, 99, 235, 0.15);
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.3;
      margin-bottom: 12px;
      letter-spacing: -0.01em;
    }

    .section-subtitle {
      font-size: 1.05rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 首屏 Hero（严禁出现任何图片） */
    .hero-section {
      padding: 80px 0 64px 0;
      background: linear-gradient(180deg, #eff6ff 0%, #ffffff 100%);
      border-bottom: 1px solid var(--border-color);
      position: relative;
      overflow: hidden;
    }

    .hero-decor-circle {
      position: absolute;
      top: -120px;
      right: -80px;
      width: 480px;
      height: 480px;
      background: radial-gradient(circle, rgba(14, 165, 233, 0.12) 0%, rgba(37, 99, 235, 0.02) 70%, transparent 100%);
      border-radius: 50%;
      pointer-events: none;
    }

    .hero-inner {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
      position: relative;
      z-index: 2;
    }

    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #ffffff;
      padding: 6px 18px;
      border-radius: 50px;
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
      font-size: 0.875rem;
      color: var(--primary);
      font-weight: 600;
      margin-bottom: 24px;
      border: 1px solid #dbeafe;
    }

    .hero-tag .dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: #10b981;
      box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
    }

    .hero-title {
      font-size: clamp(2rem, 4vw, 2.75rem);
      font-weight: 900;
      color: var(--text-main);
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.02em;
    }

    .hero-title span {
      color: var(--primary);
      position: relative;
    }

    .hero-lead {
      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;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }

    .btn-hero-main {
      padding: 14px 34px;
      font-size: 1.1rem;
      border-radius: 30px;
      font-weight: 700;
    }

    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      padding: 24px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-md);
    }

    .metric-card {
      text-align: center;
      padding: 10px;
    }

    .metric-num {
      font-size: 1.9rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1;
      margin-bottom: 6px;
    }

    .metric-num sup {
      font-size: 1.1rem;
      font-weight: 700;
      color: var(--accent);
    }

    .metric-label {
      font-size: 0.875rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 平台支持模型标签滚动条 */
    .model-strip {
      margin-top: 32px;
      text-align: center;
    }

    .model-strip-label {
      font-size: 0.85rem;
      color: var(--text-light);
      margin-bottom: 12px;
      font-weight: 600;
    }

    .model-tags-wrapper {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 8px;
      max-width: 1000px;
      margin: 0 auto;
    }

    .model-tag {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      padding: 5px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
      color: var(--text-muted);
      box-shadow: 0 1px 2px rgba(0,0,0,0.03);
      transition: all 0.2s ease;
    }

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

    /* 卡片网格布局 */
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

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

    .feature-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
      display: flex;
      flex-direction: column;
    }

    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: rgba(37, 99, 235, 0.3);
    }

    .feature-icon-badge {
      width: 44px;
      height: 44px;
      border-radius: 10px;
      background: rgba(37, 99, 235, 0.1);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 16px;
    }

    .feature-card h3 {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .feature-card p {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    .feature-tag-mini {
      margin-top: 14px;
      font-size: 0.75rem;
      font-weight: 600;
      color: var(--primary);
      background: #eff6ff;
      padding: 3px 8px;
      border-radius: 4px;
      align-self: flex-start;
    }

    /* 图文复合板块 */
    .split-layout {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }

    .media-frame {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 10px;
      box-shadow: var(--shadow-md);
      overflow: hidden;
    }

    .media-frame img {
      width: 100%;
      height: auto;
      border-radius: calc(var(--radius-lg) - 6px);
      display: block;
      object-fit: cover;
    }

    .check-list {
      list-style: none;
      margin-top: 20px;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .check-list li {
      display: flex;
      align-items: flex-start;
      gap: 10px;
      font-size: 0.95rem;
      color: var(--text-muted);
    }

    .check-list li span.check-icon {
      color: var(--success);
      font-weight: 700;
      line-height: 1.4;
    }

    /* 评测与评分板块 */
    .eval-box {
      background: linear-gradient(135deg, #ffffff 0%, #f0f7ff 100%);
      border: 1px solid #bfdbfe;
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-md);
      margin-bottom: 36px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
    }

    .eval-score-wrap {
      display: flex;
      align-items: center;
      gap: 20px;
    }

    .eval-big-score {
      font-size: 3.5rem;
      font-weight: 900;
      color: var(--primary);
      line-height: 1;
    }

    .eval-score-meta {
      display: flex;
      flex-direction: column;
      gap: 4px;
    }

    .stars-box {
      color: #f59e0b;
      font-size: 1.3rem;
      letter-spacing: 2px;
    }

    .eval-table-container {
      width: 100%;
      overflow-x: auto;
      border-radius: var(--radius-md);
      background: #ffffff;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-color);
    }

    table.eval-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.92rem;
    }

    table.eval-table th,
    table.eval-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
    }

    table.eval-table th {
      background-color: #f8fafc;
      font-weight: 700;
      color: var(--text-main);
    }

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

    table.eval-table tr:hover td {
      background-color: #f8fafc;
    }

    .highlight-col {
      background-color: rgba(37, 99, 235, 0.03);
      color: var(--primary);
      font-weight: 700;
    }

    /* 流程时间线 */
    .step-timeline {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }

    .step-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      text-align: center;
      position: relative;
    }

    .step-num {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: var(--primary);
      color: #ffffff;
      font-weight: 800;
      font-size: 1rem;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 14px;
    }

    .step-item h4 {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .step-item p {
      font-size: 0.875rem;
      color: var(--text-muted);
    }

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

    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 12px;
    }

    .review-avatar-text {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: #e0e7ff;
      color: #3730a3;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1rem;
    }

    .review-name {
      font-weight: 700;
      font-size: 0.95rem;
      color: var(--text-main);
    }

    .review-role {
      font-size: 0.8rem;
      color: var(--text-light);
    }

    .review-content {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.6;
      font-style: italic;
    }

    /* FAQ 手风琴面板 */
    .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;
      transition: border-color 0.2s;
    }

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

    .faq-header {
      width: 100%;
      padding: 18px 24px;
      text-align: left;
      background: none;
      border: none;
      font-size: 1.02rem;
      font-weight: 600;
      color: var(--text-main);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }

    .faq-header span.faq-arrow {
      font-size: 1.2rem;
      color: var(--text-light);
      transition: transform 0.25s ease;
    }

    .faq-item.active .faq-arrow {
      transform: rotate(180deg);
      color: var(--primary);
    }

    .faq-body {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      padding: 0 24px;
      color: var(--text-muted);
      font-size: 0.92rem;
      line-height: 1.7;
    }

    .faq-item.active .faq-body {
      padding: 0 24px 20px 24px;
      max-height: 400px;
    }

    /* 需求表单与联系 */
    .contact-container {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-md);
    }

    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }

    .form-group {
      margin-bottom: 18px;
    }

    .form-group label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      font-size: 0.95rem;
      background-color: #f8fafc;
      transition: border-color 0.2s, background-color 0.2s;
      font-family: inherit;
      color: var(--text-main);
    }

    .form-control:focus {
      outline: none;
      border-color: var(--border-focus);
      background-color: #ffffff;
      box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
    }

    textarea.form-control {
      resize: vertical;
      min-height: 110px;
    }

    .contact-info-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
      margin-top: 20px;
    }

    .contact-info-item {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 0.95rem;
      color: var(--text-muted);
    }

    .contact-info-item strong {
      color: var(--text-main);
      min-width: 80px;
    }

    .qr-card-box {
      margin-top: 24px;
      padding: 16px;
      border: 1px solid #e2e8f0;
      border-radius: var(--radius-md);
      display: inline-flex;
      align-items: center;
      gap: 16px;
      background: #f8fafc;
    }

    .qr-card-box img {
      width: 90px;
      height: 90px;
      border-radius: var(--radius-sm);
      display: block;
    }

    .qr-card-box p {
      font-size: 0.85rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 资讯文章与外链 */
    .article-links-container {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      margin-top: 24px;
    }

    .article-links-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 14px;
    }

    .article-item a {
      display: block;
      padding: 12px 16px;
      background: #f8fafc;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      text-decoration: none;
      color: var(--text-main);
      font-size: 0.9rem;
      font-weight: 500;
      transition: all 0.2s ease;
    }

    .article-item a:hover {
      background: #eff6ff;
      border-color: var(--primary);
      color: var(--primary);
      transform: translateX(4px);
    }

    /* 友情链接专区 */
    .friendly-links-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      align-items: center;
      padding: 16px 0;
    }

    .friendly-links-wrap a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 0.875rem;
      padding: 4px 10px;
      border-radius: 4px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      transition: all 0.2s;
    }

    .friendly-links-wrap a:hover {
      color: var(--primary);
      border-color: var(--primary);
    }

    /* 页脚标准对齐 */
    .site-footer {
      background-color: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 48px 0 24px 0;
      color: var(--text-muted);
      font-size: 0.875rem;
    }

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

    .footer-col h5 {
      color: var(--text-main);
      font-size: 0.95rem;
      font-weight: 700;
      margin-bottom: 14px;
    }

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

    .footer-col ul li a {
      color: var(--text-muted);
      text-decoration: none;
      transition: color 0.2s;
    }

    .footer-col ul li a:hover {
      color: var(--primary);
    }

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

    .footer-copyright {
      color: var(--text-light);
    }

    /* 浮动操作条与客服 */
    .float-widget {
      position: fixed;
      right: 20px;
      bottom: 24px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      color: var(--primary);
      box-shadow: 0 4px 12px rgba(0,0,0,0.15);
      border: 1px solid var(--border-color);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.25rem;
      cursor: pointer;
      text-decoration: none;
      transition: all 0.2s;
    }

    .float-btn:hover {
      transform: scale(1.06);
      color: #ffffff;
      background: var(--primary);
    }

    /* 响应式适配 */
    @media (max-width: 992px) {
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-metrics {
        grid-template-columns: repeat(2, 1fr);
      }
      .step-timeline {
        grid-template-columns: repeat(2, 1fr);
      }
      .split-layout {
        grid-template-columns: 1fr;
      }
      .contact-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .site-header .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        align-items: flex-start;
        padding: 16px 20px;
        box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1);
        border-bottom: 1px solid var(--border-color);
      }
      .site-header .nav-links.active {
        display: flex;
      }
      .site-header .nav-links li {
        width: 100%;
      }
      .site-header .nav-links li a {
        display: block;
        padding: 10px 0;
        border-bottom: 1px solid #f1f5f9;
      }
      .nav-toggle {
        display: flex;
      }
      .grid-2, .grid-3, .grid-4 {
        grid-template-columns: 1fr;
      }
      .hero-metrics {
        grid-template-columns: 1fr 1fr;
      }
      .step-timeline {
        grid-template-columns: 1fr;
      }
      .article-links-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero-actions {
        flex-direction: column;
        width: 100%;
      }
      .hero-actions .btn {
        width: 100%;
      }
    }