/* ----- 全局重置 & 变量 ----- */
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    :root {
      --bg-soft: #fbf9f5;
      --bg-card: #ffffff;
      --ink: #1c1e22;
      --ink-light: #4b4f58;
      --accent-1: #3c6cff;
      --accent-2: #ff7a5c;
      --accent-3: #a77aff;
      --accent-4: #25b6a1;
      --shadow-sm: 0 10px 28px rgba(0,0,0,0.04);
      --shadow-md: 0 18px 40px rgba(0,0,0,0.06);
      --radius-lg: 32px;
      --radius-md: 24px;
      --radius-sm: 16px;
      --border-light: 1px solid rgba(0,0,0,0.04);
      --font: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
    }
    body {
      background: var(--bg-soft);
      font-family: var(--font);
      color: var(--ink);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 统一容器 */
    header, main, footer {
      width: 100%;
    }
    .section {
      padding: 72px 0;
      position: relative;
    }
    .section-header {
      margin-bottom: 48px;
    }
    .eyebrow {
      display: inline-block;
      font-size: 14px;
      font-weight: 600;
      letter-spacing: 0.08em;
      text-transform: uppercase;
      color: var(--accent-1);
      background: rgba(60,108,255,0.08);
      padding: 6px 16px;
      border-radius: 40px;
      margin-bottom: 16px;
    }
    h1 {
      font-size: clamp(2.2rem, 5vw, 3.8rem);
      line-height: 1.15;
      font-weight: 700;
      letter-spacing: -0.02em;
      color: var(--ink);
      margin-bottom: 20px;
    }
    h2 {
      font-size: clamp(1.8rem, 3.5vw, 2.6rem);
      font-weight: 700;
      letter-spacing: -0.02em;
      color: var(--ink);
      margin-bottom: 16px;
    }
    h3 {
      font-size: 1.35rem;
      font-weight: 600;
      color: var(--ink);
    }
    .subhead {
      font-size: 1.15rem;
      color: var(--ink-light);
      max-width: 720px;
      margin-bottom: 32px;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-weight: 600;
      font-size: 1rem;
      padding: 14px 32px;
      border-radius: 60px;
      text-decoration: none;
      transition: all 0.2s ease;
      border: 1px solid transparent;
      cursor: pointer;
      line-height: 1.4;
    }
    .btn-primary {
      background: var(--ink);
      color: #ffffff;
      box-shadow: 0 8px 20px rgba(0,0,0,0.08);
    }
    .btn-primary:hover {
      background: #2b2e34;
      transform: translateY(-2px);
      box-shadow: 0 14px 28px rgba(0,0,0,0.12);
    }
    .btn-outline {
      background: transparent;
      color: var(--ink);
      border: 1px solid rgba(0,0,0,0.12);
    }
    .btn-outline:hover {
      background: rgba(0,0,0,0.02);
      border-color: rgba(0,0,0,0.24);
      transform: translateY(-2px);
    }
    .btn-accent {
      background: var(--accent-1);
      color: #ffffff;
      box-shadow: 0 8px 20px rgba(60,108,255,0.24);
    }
    .btn-accent:hover {
      background: #2c5aee;
      transform: translateY(-2px);
      box-shadow: 0 14px 28px rgba(60,108,255,0.32);
    }
    /* 卡片通用 */
    .card {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      border: var(--border-light);
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    /* ----- 导航 ----- */
    .site-header {
      padding: 12px 0;
      background: rgba(251,249,245,0.88);
      backdrop-filter: blur(12px);
      position: sticky;
      top: 0;
      z-index: 50;
      border-bottom: 1px solid rgba(0,0,0,0.03);
    }
    .nav-wrap {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
    }
    .logo-link {
      display: flex;
      align-items: center;
      flex-shrink: 0;
    }
    .ai-page-logo {
      max-width: 100%;
      height: auto;
      max-height: 44px;
      width: auto;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0; /* 按要求 gap:0 */
      list-style: none;
      flex-wrap: wrap;
    }
    .nav-links li {
      margin: 0 6px;
    }
    .nav-links a {
      display: inline-block;
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--ink-light);
      text-decoration: none;
      padding: 8px 12px;
      border-radius: 40px;
      transition: background 0.2s ease, color 0.2s ease;
    }
    .nav-links a:hover {
      background: rgba(60,108,255,0.06);
      color: var(--accent-1);
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
      flex-shrink: 0;
    }
    .menu-toggle {
      display: none;
      background: transparent;
      border: 1px solid rgba(0,0,0,0.08);
      border-radius: 12px;
      padding: 10px 12px;
      font-size: 1.2rem;
      cursor: pointer;
      color: var(--ink);
    }
    /* ----- Hero 首屏（无图片） ----- */
    .hero {
      padding: 64px 0 80px;
      position: relative;
      overflow: hidden;
    }
    .hero-bg-shapes {
      position: absolute;
      inset: 0;
      z-index: 0;
      pointer-events: none;
    }
    .shape {
      position: absolute;
      border-radius: 50%;
      filter: blur(80px);
      opacity: 0.25;
    }
    .shape-1 {
      width: 500px;
      height: 500px;
      background: var(--accent-1);
      top: -160px;
      right: -100px;
    }
    .shape-2 {
      width: 400px;
      height: 400px;
      background: var(--accent-2);
      bottom: -120px;
      left: -80px;
      opacity: 0.18;
    }
    .shape-3 {
      width: 300px;
      height: 300px;
      background: var(--accent-3);
      top: 40%;
      left: 30%;
      opacity: 0.12;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 48px;
      align-items: center;
      position: relative;
      z-index: 2;
    }
    .hero-left h1 {
      max-width: 720px;
    }
    .hero-left p {
      font-size: 1.2rem;
      color: var(--ink-light);
      max-width: 620px;
      margin-bottom: 32px;
    }
    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      align-items: center;
    }
    .hero-stats {
      display: flex;
      flex-wrap: wrap;
      gap: 32px;
      margin-top: 40px;
      padding-top: 28px;
      border-top: 1px solid rgba(0,0,0,0.06);
    }
    .stat-item {
      display: flex;
      flex-direction: column;
    }
    .stat-number {
      font-size: 2rem;
      font-weight: 700;
      letter-spacing: -0.02em;
      color: var(--ink);
    }
    .stat-label {
      font-size: 0.9rem;
      color: var(--ink-light);
    }
    .hero-right {
      display: flex;
      justify-content: center;
    }
    .model-badge-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      justify-content: center;
      max-width: 380px;
      padding: 24px;
      background: rgba(255,255,255,0.6);
      backdrop-filter: blur(10px);
      border-radius: var(--radius-lg);
      border: 1px solid rgba(255,255,255,0.8);
      box-shadow: var(--shadow-sm);
    }
    .model-badge {
      font-size: 0.78rem;
      font-weight: 500;
      color: var(--ink-light);
      background: rgba(255,255,255,0.7);
      padding: 6px 12px;
      border-radius: 40px;
      border: 1px solid rgba(0,0,0,0.04);
      transition: background 0.2s ease, color 0.2s ease;
    }
    .model-badge:hover {
      background: var(--accent-1);
      color: #fff;
      border-color: var(--accent-1);
    }
    /* ----- 数据指标卡片 ----- */
    .metric-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .metric-card {
      padding: 28px 20px;
      text-align: center;
      background: #fff;
      border-radius: var(--radius-sm);
      box-shadow: var(--shadow-sm);
      border: 1px solid rgba(0,0,0,0.03);
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }
    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .metric-value {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--accent-1);
      line-height: 1.2;
    }
    .metric-label {
      font-size: 0.95rem;
      color: var(--ink-light);
      margin-top: 4px;
    }
    /* ----- 服务能力卡片 ----- */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
      gap: 24px;
    }
    .service-card {
      padding: 28px 24px;
      background: #fff;
      border-radius: var(--radius-md);
      border: 1px solid rgba(0,0,0,0.03);
      box-shadow: var(--shadow-sm);
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .service-icon {
      width: 48px;
      height: 48px;
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.6rem;
      margin-bottom: 20px;
      background: rgba(60,108,255,0.08);
      color: var(--accent-1);
    }
    .service-card h3 {
      margin-bottom: 10px;
    }
    .service-card p {
      font-size: 0.95rem;
      color: var(--ink-light);
    }
    /* ----- 流程步骤 ----- */
    .steps-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 16px;
    }
    .step-card {
      padding: 32px 24px;
      background: #fff;
      border-radius: var(--radius-md);
      border-left: 4px solid var(--accent-1);
      box-shadow: var(--shadow-sm);
      transition: transform 0.2s ease;
    }
    .step-card:hover {
      transform: translateY(-4px);
    }
    .step-num {
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--accent-1);
      opacity: 0.35;
      margin-bottom: 12px;
    }
    .step-card h3 {
      margin-bottom: 8px;
    }
    .step-card p {
      font-size: 0.95rem;
      color: var(--ink-light);
    }
    /* ----- 对比评测表格 ----- */
    .compare-table-wrap {
      overflow-x: auto;
      background: #fff;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      border: 1px solid rgba(0,0,0,0.03);
    }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      min-width: 700px;
    }
    .compare-table th,
    .compare-table td {
      padding: 18px 20px;
      text-align: left;
      border-bottom: 1px solid rgba(0,0,0,0.04);
      font-size: 0.95rem;
    }
    .compare-table th {
      background: rgba(60,108,255,0.04);
      font-weight: 600;
      color: var(--ink);
    }
    .compare-table td:first-child {
      font-weight: 600;
      color: var(--ink);
    }
    .compare-table tr:last-child td {
      border-bottom: none;
    }
    .rating-stars {
      color: #ffb23f;
      letter-spacing: 2px;
    }
    .score-big {
      font-size: 2rem;
      font-weight: 700;
      color: var(--accent-1);
      line-height: 1;
    }
    /* ----- FAQ 折叠面板 ----- */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }
    .faq-item {
      background: #fff;
      border-radius: var(--radius-sm);
      border: 1px solid rgba(0,0,0,0.04);
      box-shadow: var(--shadow-sm);
      overflow: hidden;
      transition: box-shadow 0.2s ease;
    }
    .faq-item:hover {
      box-shadow: var(--shadow-md);
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 18px 20px;
      cursor: pointer;
      font-weight: 600;
      color: var(--ink);
      font-size: 1rem;
      user-select: none;
      background: #fff;
    }
    .faq-question span {
      font-size: 1.2rem;
      color: var(--accent-1);
      transition: transform 0.2s ease;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      padding: 0 20px;
      font-size: 0.95rem;
      color: var(--ink-light);
      transition: max-height 0.3s ease, padding 0.3s ease;
    }
    .faq-item.active .faq-answer {
      max-height: 260px;
      padding: 0 20px 20px;
    }
    .faq-item.active .faq-question span {
      transform: rotate(45deg);
    }
    /* ----- 客户评论卡片 ----- */
    .review-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .review-card {
      padding: 28px 24px;
      background: #fff;
      border-radius: var(--radius-md);
      border: 1px solid rgba(0,0,0,0.03);
      box-shadow: var(--shadow-sm);
      transition: transform 0.2s ease;
    }
    .review-card:hover {
      transform: translateY(-4px);
    }
    .review-stars {
      color: #ffb23f;
      font-size: 1rem;
      letter-spacing: 2px;
      margin-bottom: 12px;
    }
    .review-text {
      font-size: 0.98rem;
      color: var(--ink);
      margin-bottom: 18px;
      line-height: 1.55;
    }
    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .avatar-placeholder {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--accent-1), var(--accent-3));
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-weight: 700;
      font-size: 0.9rem;
      flex-shrink: 0;
    }
    .author-info {
      display: flex;
      flex-direction: column;
    }
    .author-name {
      font-weight: 600;
      font-size: 0.95rem;
      color: var(--ink);
    }
    .author-role {
      font-size: 0.8rem;
      color: var(--ink-light);
    }
    /* ----- 案例展示 & 图片组 ----- */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .case-img-wrap {
      border-radius: var(--radius-sm);
      overflow: hidden;
      background: #fff;
      box-shadow: var(--shadow-sm);
      border: 1px solid rgba(0,0,0,0.03);
      transition: transform 0.2s ease;
    }
    .case-img-wrap:hover {
      transform: scale(1.01);
    }
    .ai-page-image {
      display: block;
      width: 100%;
      height: auto;
      object-fit: contain;
    }
    .banner-thumb-row {
      display: flex;
      gap: 16px;
      margin-top: 24px;
      flex-wrap: wrap;
    }
    .banner-thumb-item {
      flex: 1 1 180px;
      border-radius: var(--radius-sm);
      overflow: hidden;
      background: #fff;
      box-shadow: var(--shadow-sm);
    }
    .banner-thumb-item img {
      width: 100%;
      height: auto;
      display: block;
    }
    /* ----- 文章列表 ----- */
    .article-list {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
      gap: 20px;
    }
    .article-card {
      padding: 24px;
      background: #fff;
      border-radius: var(--radius-sm);
      border: 1px solid rgba(0,0,0,0.03);
      box-shadow: var(--shadow-sm);
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }
    .article-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .article-card h3 {
      font-size: 1.1rem;
      margin-bottom: 8px;
    }
    .article-card p {
      font-size: 0.9rem;
      color: var(--ink-light);
      margin-bottom: 16px;
    }
    .article-link {
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--accent-1);
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }
    .article-link:hover {
      text-decoration: underline;
    }
    /* ----- 表单 ----- */
    .form-card {
      background: #fff;
      border-radius: var(--radius-lg);
      padding: 40px 36px;
      box-shadow: var(--shadow-md);
      border: 1px solid rgba(0,0,0,0.03);
    }
    .form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }
    .form-group.full-width {
      grid-column: 1 / -1;
    }
    .form-label {
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--ink);
    }
    .form-input,
    .form-select,
    .form-textarea {
      width: 100%;
      padding: 14px 16px;
      border: 1px solid rgba(0,0,0,0.08);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      font-family: var(--font);
      background: #fff;
      transition: border-color 0.2s ease, box-shadow 0.2s ease;
      color: var(--ink);
    }
    .form-input:focus,
    .form-select:focus,
    .form-textarea:focus {
      outline: none;
      border-color: var(--accent-1);
      box-shadow: 0 0 0 3px rgba(60,108,255,0.12);
    }
    .form-textarea {
      resize: vertical;
      min-height: 120px;
    }
    .btn-submit {
      background: var(--ink);
      color: #fff;
      padding: 16px 32px;
      border-radius: 60px;
      font-weight: 600;
      font-size: 1rem;
      border: none;
      cursor: pointer;
      transition: all 0.2s ease;
      width: 100%;
      margin-top: 8px;
    }
    .btn-submit:hover {
      background: #2b2e34;
      transform: translateY(-2px);
      box-shadow: 0 12px 24px rgba(0,0,0,0.1);
    }
    /* ----- Footer ----- */
    .site-footer {
      background: #1c1e22;
      color: #e6e8ec;
      padding: 56px 0 32px;
      margin-top: 48px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-brand .ai-page-logo {
      
      max-height: 40px;
      margin-bottom: 16px;
    }
    .footer-desc {
      font-size: 0.9rem;
      color: #a0a5b0;
      line-height: 1.6;
      margin-bottom: 16px;
    }
    .footer-links h4,
    .footer-contact h4 {
      font-size: 1rem;
      font-weight: 600;
      color: #ffffff;
      margin-bottom: 16px;
    }
    .footer-links ul {
      list-style: none;
    }
    .footer-links li {
      margin-bottom: 10px;
    }
    .footer-links a {
      color: #a0a5b0;
      text-decoration: none;
      font-size: 0.9rem;
      transition: color 0.2s ease;
    }
    .footer-links a:hover {
      color: #ffffff;
    }
    .footer-contact p {
      font-size: 0.9rem;
      color: #a0a5b0;
      margin-bottom: 8px;
    }
    .footer-contact a {
      color: #a0a5b0;
      text-decoration: none;
    }
    .footer-contact a:hover {
      color: #ffffff;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.08);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
      font-size: 0.85rem;
      color: #7e828c;
    }
    .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-top: 12px;
    }
    .friend-links a {
      color: #7e828c;
      text-decoration: none;
      font-size: 0.8rem;
      transition: color 0.2s ease;
    }
    .friend-links a:hover {
      color: #ffffff;
    }
    /* ----- 浮动客服 & 返回顶部 ----- */
    .float-support {
      position: fixed;
      right: 24px;
      bottom: 100px;
      z-index: 60;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .float-btn {
      width: 52px;
      height: 52px;
      border-radius: 50%;
      background: #fff;
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      border: 1px solid rgba(0,0,0,0.04);
      transition: transform 0.2s ease, box-shadow 0.2s ease;
      font-size: 1.3rem;
      color: var(--ink);
      text-decoration: none;
    }
    .float-btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 18px 30px rgba(0,0,0,0.1);
    }
    .float-kefu {
      background: var(--accent-1);
      color: #fff;
    }
    .back-top {
      position: fixed;
      right: 24px;
      bottom: 36px;
      z-index: 60;
      width: 52px;
      height: 52px;
      border-radius: 50%;
      background: var(--ink);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      box-shadow: var(--shadow-md);
      transition: opacity 0.2s ease, transform 0.2s ease;
      opacity: 0;
      pointer-events: none;
      font-size: 1.2rem;
      border: none;
    }
    .back-top.visible {
      opacity: 1;
      pointer-events: auto;
    }
    .back-top:hover {
      transform: translateY(-2px);
    }
    /* ----- 动画 ----- */
    .fade-in {
      opacity: 0;
      transform: translateY(24px);
      transition: opacity 0.6s ease, transform 0.6s ease;
    }
    .fade-in.visible {
      opacity: 1;
      transform: translateY(0);
    }
    /* ----- 响应式 ----- */
    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .hero-right {
        justify-content: flex-start;
      }
      .metric-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .steps-grid {
        grid-template-columns: 1fr 1fr;
      }
      .review-grid {
        grid-template-columns: 1fr 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 820px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: #fff;
        flex-direction: column;
        align-items: flex-start;
        padding: 16px 24px;
        box-shadow: var(--shadow-md);
        border-radius: 0 0 var(--radius-md) var(--radius-md);
        gap: 0;
      }
      .nav-links.open {
        display: flex;
      }
      .nav-links li {
        width: 100%;
        margin: 0;
      }
      .nav-links a {
        display: block;
        width: 100%;
        padding: 12px 0;
        border-radius: 0;
      }
      .menu-toggle {
        display: block;
      }
      .nav-actions .btn-outline {
        display: none;
      }
      .faq-grid {
        grid-template-columns: 1fr;
      }
      .form-grid {
        grid-template-columns: 1fr;
      }
    }
    @media (max-width: 640px) {
      .section {
        padding: 48px 0;
      }
      .metric-grid {
        grid-template-columns: 1fr 1fr;
        gap: 12px;
      }
      .steps-grid {
        grid-template-columns: 1fr;
      }
      .review-grid {
        grid-template-columns: 1fr;
      }
      .case-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
        gap: 28px;
      }
      .form-card {
        padding: 28px 20px;
      }
      .float-support {
        right: 16px;
        bottom: 90px;
      }
      .back-top {
        right: 16px;
        bottom: 28px;
      }
      .hero-stats {
        gap: 20px;
      }
      .banner-thumb-row {
        flex-direction: column;
      }
    }