/* CSS Reset & Variables - 浅色背景 + 炫彩荧光风视觉系统 */
    :root {
      --bg-page: #f8fafc;
      --bg-surface: #ffffff;
      --bg-alt: #f1f5f9;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --neon-cyan: #06b6d4;
      --neon-violet: #8b5cf6;
      --neon-pink: #ec4899;
      --neon-green: #10b981;
      --primary-grad: linear-gradient(135deg, #06b6d4 0%, #8b5cf6 50%, #ec4899 100%);
      --primary-hover: linear-gradient(135deg, #0284c7 0%, #7c3aed 50%, #db2777 100%);
      --accent-glow: 0 10px 25px -5px rgba(6, 182, 212, 0.3), 0 8px 10px -6px rgba(139, 92, 246, 0.3);
      --border-glow: linear-gradient(135deg, rgba(6,182,212,0.4), rgba(139,92,246,0.4));
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --container-width: 1240px;
      --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

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

    body {
      overflow-x: hidden;
    }

    /* 统一全局容器 */
    .container {
      width: 100%;
      max-width: var(--container-width);
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 标题与文字样式 */
    h1, h2, h3, h4, h5, h6 {
      color: var(--text-main);
      font-weight: 700;
      line-height: 1.3;
    }

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

    a:hover {
      color: var(--neon-violet);
    }

    /* 炫彩渐变文字 */
    .gradient-text {
      background: var(--primary-grad);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      display: inline-block;
    }

    /* 通用按钮 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      font-size: 16px;
      font-weight: 600;
      border-radius: 50px;
      border: none;
      cursor: pointer;
      transition: var(--transition);
      text-align: center;
      white-space: nowrap;
    }

    .btn-neon {
      background: var(--primary-grad);
      color: #ffffff !important;
      box-shadow: var(--accent-glow);
    }

    .btn-neon:hover {
      transform: translateY(-2px);
      box-shadow: 0 15px 30px -5px rgba(6, 182, 212, 0.45);
    }

    .btn-outline {
      background: var(--bg-surface);
      color: var(--text-main) !important;
      border: 2px solid var(--neon-cyan);
      box-shadow: 0 4px 12px rgba(6, 182, 212, 0.15);
    }

    .btn-outline:hover {
      background: var(--neon-cyan);
      color: #ffffff !important;
      transform: translateY(-2px);
    }

    /* 徽章 */
    .badge {
      display: inline-block;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      background: rgba(6, 182, 212, 0.1);
      color: var(--neon-cyan);
      border: 1px solid rgba(6, 182, 212, 0.3);
      margin-bottom: 12px;
    }

    /* 顶部导航 */
    .header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(226, 232, 240, 0.8);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
    }

    .brand-wrap {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .ai-page-logo {
      height: 42px;
      width: auto;
      object-fit: contain;
    }

    .ai-page-home-link {
      font-size: 14px;
      font-weight: 600;
      color: var(--text-muted);
      padding: 4px 8px;
      border-radius: 6px;
      background: var(--bg-alt);
    }

    .nav-wrapper {
      display: flex;
      align-items: center;
    }

    /* 用户明确要求：页面CSS .nav-links的gap属性设置为0 */
    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 0;
    }

    .nav-links li a {
      display: block;
      padding: 8px 12px;
      font-size: 14px;
      font-weight: 500;
      color: var(--text-main);
      transition: var(--transition);
      border-radius: 6px;
    }

    .nav-links li a:hover {
      color: var(--neon-cyan);
      background: rgba(6, 182, 212, 0.08);
    }

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

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

    /* 区域通用样式 */
    section {
      padding: 80px 0;
      position: relative;
    }

    .section-alt {
      background-color: var(--bg-alt);
    }

    .section-header {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 50px auto;
    }

    .section-header h2 {
      font-size: 32px;
      margin-bottom: 16px;
    }

    .section-header p {
      font-size: 16px;
      color: var(--text-muted);
    }

    /* 首屏 HERO 区域 - 严格要求：不得出现任何图片 */
    .hero-section {
      padding: 100px 0 80px 0;
      background: radial-gradient(circle at 50% 20%, rgba(6, 182, 212, 0.12) 0%, rgba(139, 92, 246, 0.08) 50%, rgba(248, 250, 252, 0) 100%);
      text-align: center;
    }

    .hero-content {
      max-width: 960px;
      margin: 0 auto;
    }

    /* 改写后的 H1，控制在20字以内 */
    .hero-title {
      font-size: 46px;
      font-weight: 800;
      letter-spacing: -0.5px;
      margin-bottom: 24px;
      line-height: 1.25;
    }

    .hero-desc {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 36px;
      max-width: 800px;
      margin-left: auto;
      margin-right: auto;
    }

    .hero-ctas {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }

    .hero-features-list {
      display: flex;
      justify-content: center;
      flex-wrap: wrap;
      gap: 20px;
      list-style: none;
      margin-bottom: 50px;
    }

    .hero-features-list li {
      background: var(--bg-surface);
      border: 1px solid rgba(6, 182, 212, 0.2);
      padding: 8px 18px;
      border-radius: 30px;
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.03);
    }

    /* 纯CSS数据卡片 */
    .hero-stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 40px;
    }

    .stat-card {
      background: var(--bg-surface);
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px solid rgba(226, 232, 240, 0.8);
      box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05);
      position: relative;
      overflow: hidden;
    }

    .stat-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 3px;
      background: var(--primary-grad);
    }

    .stat-number {
      font-size: 32px;
      font-weight: 800;
      margin-bottom: 6px;
    }

    .stat-label {
      font-size: 14px;
      color: var(--text-muted);
    }

    /* 网格卡片系统 */
    .grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 30px; }
    .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
    .grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }

    .card {
      background: var(--bg-surface);
      border-radius: var(--radius-md);
      padding: 28px;
      border: 1px solid rgba(226, 232, 240, 0.9);
      box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

    .card:hover {
      transform: translateY(-4px);
      box-shadow: 0 20px 30px -10px rgba(6, 182, 212, 0.15);
      border-color: rgba(6, 182, 212, 0.4);
    }

    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: rgba(6, 182, 212, 0.1);
      color: var(--neon-cyan);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      margin-bottom: 20px;
      font-weight: bold;
    }

    .card-title {
      font-size: 20px;
      margin-bottom: 12px;
    }

    .card-desc {
      font-size: 14px;
      color: var(--text-muted);
      flex: 1;
    }

    /* 模型标签云 */
    .models-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 30px;
    }

    .model-tag {
      background: var(--bg-surface);
      border: 1px solid rgba(139, 92, 246, 0.25);
      color: var(--text-main);
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 500;
      transition: var(--transition);
    }

    .model-tag:hover {
      background: var(--neon-violet);
      color: #ffffff;
      transform: scale(1.05);
    }

    /* 图文混排与媒体展示 */
    .media-box {
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: 0 10px 25px rgba(0, 0, 0, 0.08);
      border: 1px solid rgba(226, 232, 240, 0.8);
      background: #ffffff;
    }

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

    /* 流程步骤 */
    .steps-container {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 20px;
    }

    .step-item {
      background: var(--bg-surface);
      padding: 24px 16px;
      border-radius: var(--radius-md);
      text-align: center;
      border: 1px solid rgba(226, 232, 240, 0.8);
      position: relative;
    }

    .step-number {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: var(--primary-grad);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      margin: 0 auto 16px auto;
    }

    /* 对比评测板块（五星与9.9分） */
    .eval-hero-box {
      background: var(--bg-surface);
      border: 2px solid var(--neon-cyan);
      border-radius: var(--radius-lg);
      padding: 40px;
      text-align: center;
      margin-bottom: 40px;
      box-shadow: var(--accent-glow);
    }

    .eval-stars {
      font-size: 32px;
      color: #f59e0b;
      margin-bottom: 8px;
    }

    .eval-score {
      font-size: 48px;
      font-weight: 900;
      color: var(--text-main);
      line-height: 1;
    }

    .eval-score span {
      font-size: 20px;
      color: var(--text-muted);
      font-weight: 500;
    }

    .eval-table-wrap {
      overflow-x: auto;
      background: var(--bg-surface);
      border-radius: var(--radius-md);
      box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
      border: 1px solid rgba(226, 232, 240, 0.8);
    }

    .custom-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 600px;
    }

    .custom-table th, .custom-table td {
      padding: 16px 20px;
      border-bottom: 1px solid rgba(226, 232, 240, 0.8);
    }

    .custom-table th {
      background: var(--bg-alt);
      font-weight: 700;
      color: var(--text-main);
    }

    .highlight-col {
      background: rgba(6, 182, 212, 0.05);
      font-weight: 600;
      color: var(--neon-cyan);
    }

    /* FAQ 折叠面板 */
    .faq-list {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .faq-item {
      background: var(--bg-surface);
      border-radius: var(--radius-md);
      border: 1px solid rgba(226, 232, 240, 0.8);
      overflow: hidden;
      transition: var(--transition);
    }

    .faq-header {
      padding: 20px 24px;
      font-size: 17px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }

    .faq-header::after {
      content: "+";
      font-size: 24px;
      color: var(--neon-cyan);
      transition: transform 0.3s ease;
    }

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

    .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: 15px;
      border-top: 1px solid transparent;
    }

    .faq-item.active .faq-body {
      max-height: 200px;
      padding: 16px 24px 24px 24px;
      border-top-color: rgba(226, 232, 240, 0.8);
    }

    /* 表单区 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      background: var(--bg-surface);
      padding: 40px;
      border-radius: var(--radius-lg);
      border: 1px solid rgba(226, 232, 240, 0.8);
      box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    }

    .form-group {
      margin-bottom: 20px;
    }

    .form-group label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border-radius: var(--radius-sm);
      border: 1px solid #cbd5e1;
      font-size: 15px;
      background: var(--bg-alt);
      color: var(--text-main);
      outline: none;
      transition: var(--transition);
    }

    .form-control:focus {
      border-color: var(--neon-cyan);
      box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.15);
      background: #ffffff;
    }

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

    .qr-card {
      text-align: center;
      padding: 24px;
      background: var(--bg-alt);
      border-radius: var(--radius-md);
      margin-top: 20px;
    }

    .qr-card img {
      width: 160px;
      height: 160px;
      border-radius: 8px;
      margin-bottom: 12px;
    }

    /* 行业资讯 & 友情链接 */
    .articles-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .articles-list li a {
      display: flex;
      justify-content: space-between;
      padding: 14px 20px;
      background: var(--bg-surface);
      border-radius: var(--radius-sm);
      color: var(--text-main);
      border: 1px solid rgba(226, 232, 240, 0.8);
    }

    .articles-list li a:hover {
      border-color: var(--neon-cyan);
      transform: translateX(4px);
    }

    /* 页脚对齐规范 */
    .footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px 0;
      border-top: 1px solid #1e293b;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      color: #ffffff;
      font-size: 16px;
      margin-bottom: 20px;
    }

    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .footer-links a {
      color: #94a3b8;
      font-size: 14px;
    }

    .footer-links a:hover {
      color: #ffffff;
    }

    .friend-links-box {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      margin-top: 24px;
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 14px;
    }

    .friend-links-box a {
      color: #64748b;
    }

    .friend-links-box a:hover {
      color: var(--neon-cyan);
    }

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 30px;
      text-align: center;
      font-size: 13px;
      color: #64748b;
    }

    /* 浮动客服 */
    .floating-kefu {
      position: fixed;
      right: 24px;
      bottom: 24px;
      z-index: 999;
      background: var(--primary-grad);
      color: #fff;
      width: 56px;
      height: 56px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: var(--accent-glow);
      cursor: pointer;
      transition: var(--transition);
    }

    .floating-kefu:hover {
      transform: scale(1.1);
    }

    /* 响应式适配 */
    @media (max-width: 1024px) {
      .grid-4, .steps-container { grid-template-columns: repeat(2, 1fr); }
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .hero-stats { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      .header-inner { height: 64px; }
      .menu-toggle { display: block; }
      .nav-wrapper {
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: #ffffff;
        border-bottom: 1px solid #e2e8f0;
        padding: 20px;
        display: none;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
      }
      .nav-wrapper.active { display: block; }
      .nav-links { flex-direction: column; align-items: flex-start; }
      .hero-title { font-size: 32px; }
      .grid-2, .grid-3, .grid-4, .steps-container, .contact-wrapper, .footer-grid { grid-template-columns: 1fr; }
      .hero-stats { grid-template-columns: 1fr 1fr; }
    }