:root {
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --bg-alt: #f1f5f9;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --neon-cyan: #00f2fe;
      --neon-blue: #4facfe;
      --neon-purple: #7928ca;
      --neon-pink: #ff007f;
      --neon-amber: #ff9900;
      --primary: #2563eb;
      --primary-hover: #1d4ed8;
      --border-color: #e2e8f0;
      --border-glow: rgba(0, 242, 254, 0.35);
      --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.04);
      --shadow-md: 0 6px 20px rgba(15, 23, 42, 0.08);
      --shadow-neon: 0 8px 30px rgba(121, 40, 202, 0.12);
      --radius: 14px;
      --radius-sm: 8px;
    }

    * {
      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-main);
      color: var(--text-main);
      line-height: 1.6;
    }

    body {
      background: radial-gradient(circle at 10% 0%, rgba(0, 242, 254, 0.05) 0%, transparent 40%),
                  radial-gradient(circle at 90% 20%, rgba(255, 0, 127, 0.04) 0%, transparent 45%),
                  radial-gradient(circle at 50% 60%, rgba(121, 40, 202, 0.03) 0%, transparent 50%),
                  var(--bg-main);
      min-height: 100vh;
      overflow-x: hidden;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.25s ease;
    }

    .container {
      width: 100%;
      max-width: 1200px;
      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, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 4px 20px rgba(0,0,0,0.03);
    }

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

    .logo-box {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .ai-page-logo {
      height: 38px;
      width: auto;
      object-fit: contain;
      display: block;
    }

    .brand-name {
      font-size: 1.25rem;
      font-weight: 800;
      background: linear-gradient(135deg, #0f172a 0%, #2563eb 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

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

    .nav-item a {
      font-size: 0.92rem;
      font-weight: 600;
      color: var(--text-muted);
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      display: inline-block;
    }

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

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 20px;
      font-size: 0.95rem;
      font-weight: 700;
      border-radius: 9999px;
      cursor: pointer;
      border: 1px solid transparent;
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
      text-align: center;
    }

    .btn-neon {
      background: linear-gradient(135deg, #00f2fe 0%, #4facfe 50%, #7928ca 100%);
      color: #ffffff;
      box-shadow: 0 4px 15px rgba(0, 242, 254, 0.4);
      border: none;
    }

    .btn-neon:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 22px rgba(121, 40, 202, 0.45);
      color: #ffffff;
    }

    .btn-secondary {
      background: #ffffff;
      color: var(--text-main);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .btn-secondary:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: #f8fafc;
    }

    .btn-lg {
      padding: 14px 32px;
      font-size: 1.05rem;
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 6px;
      color: var(--text-main);
    }

    /* 模块通用样式 */
    .section-py {
      padding-top: 80px;
      padding-bottom: 80px;
      position: relative;
    }

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

    .section-tag {
      display: inline-block;
      padding: 4px 14px;
      background: rgba(37, 99, 235, 0.08);
      color: var(--primary);
      font-size: 0.82rem;
      font-weight: 700;
      border-radius: 9999px;
      margin-bottom: 12px;
      border: 1px solid rgba(37, 99, 235, 0.18);
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.35;
      margin-bottom: 14px;
    }

    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 首屏 Hero (无任何图片) */
    .hero-section {
      padding-top: 75px;
      padding-bottom: 80px;
      text-align: center;
      position: relative;
    }

    .hero-badge-wrap {
      margin-bottom: 20px;
    }

    .hero-neon-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      background: linear-gradient(90deg, rgba(0, 242, 254, 0.12), rgba(255, 0, 127, 0.12));
      border: 1px solid rgba(0, 242, 254, 0.4);
      border-radius: 9999px;
      font-size: 0.88rem;
      font-weight: 700;
      color: #0f172a;
    }

    .hero-neon-badge::before {
      content: "";
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: #00f2fe;
      box-shadow: 0 0 10px #00f2fe, 0 0 20px #00f2fe;
    }

    .hero-title {
      font-size: 2.7rem;
      font-weight: 900;
      line-height: 1.25;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-title-highlight {
      background: linear-gradient(135deg, #0070f3 0%, #7928ca 50%, #ff007f 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-subtitle {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 820px;
      margin: 0 auto 36px auto;
      line-height: 1.75;
    }

    .hero-actions {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 50px;
    }

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 30px;
    }

    .stat-card {
      background: #ffffff;
      padding: 24px 16px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      position: relative;
      overflow: hidden;
      transition: transform 0.25s ease, box-shadow 0.25s ease;
    }

    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-neon);
      border-color: var(--border-glow);
    }

    .stat-card::after {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 3px;
      background: linear-gradient(90deg, #00f2fe, #7928ca);
    }

    .stat-num {
      font-size: 2.2rem;
      font-weight: 900;
      color: var(--primary);
      margin-bottom: 4px;
      line-height: 1.2;
    }

    .stat-label {
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-muted);
    }

    /* 平台介绍 & 模型聚合 */
    .models-marquee-card {
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      padding: 30px;
      box-shadow: var(--shadow-sm);
      margin-bottom: 40px;
    }

    .models-list-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
    }

    .model-chip {
      background: var(--bg-alt);
      color: var(--text-main);
      padding: 6px 14px;
      border-radius: 8px;
      font-size: 0.88rem;
      font-weight: 600;
      border: 1px solid rgba(0,0,0,0.05);
      transition: all 0.2s ease;
    }

    .model-chip:hover {
      background: #ffffff;
      border-color: var(--primary);
      color: var(--primary);
      transform: scale(1.05);
      box-shadow: 0 4px 12px rgba(37, 99, 235, 0.15);
    }

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

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

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
    }

    .feature-card {
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      padding: 26px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
      position: relative;
    }

    .feature-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-neon);
      border-color: rgba(0, 242, 254, 0.5);
    }

    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: linear-gradient(135deg, rgba(0, 242, 254, 0.15), rgba(121, 40, 202, 0.15));
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.35rem;
      color: var(--primary);
      margin-bottom: 18px;
    }

    .card-title {
      font-size: 1.2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }

    .card-text {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.65;
      flex-grow: 1;
    }

    .card-badge {
      align-self: flex-start;
      margin-top: 14px;
      padding: 3px 10px;
      background: #eff6ff;
      color: var(--primary);
      font-size: 0.78rem;
      font-weight: 700;
      border-radius: 9999px;
    }

    /* 流程时间线 */
    .process-grid {
      display: grid;
      grid-template-columns: repeat(6, 1fr);
      gap: 16px;
    }

    .process-step-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 20px 14px;
      text-align: center;
      position: relative;
      box-shadow: var(--shadow-sm);
    }

    .step-number {
      width: 36px;
      height: 36px;
      margin: 0 auto 12px auto;
      border-radius: 50%;
      background: linear-gradient(135deg, #00f2fe, #7928ca);
      color: #ffffff;
      font-size: 0.95rem;
      font-weight: 800;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .step-title {
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 6px;
      color: var(--text-main);
    }

    .step-desc {
      font-size: 0.82rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 评测与对比表格 */
    .review-score-hero {
      background: linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%);
      color: #ffffff;
      border-radius: var(--radius);
      padding: 36px;
      margin-bottom: 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
      box-shadow: 0 10px 30px rgba(15, 23, 42, 0.15);
    }

    .score-left h3 {
      font-size: 1.6rem;
      margin-bottom: 8px;
    }

    .score-left p {
      color: #cbd5e1;
      font-size: 0.95rem;
    }

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

    .stars-box {
      color: #facc15;
      font-size: 1.4rem;
      letter-spacing: 2px;
    }

    .score-badge {
      background: linear-gradient(135deg, #ff007f, #7928ca);
      padding: 10px 22px;
      border-radius: 12px;
      font-size: 2rem;
      font-weight: 900;
      color: #ffffff;
      box-shadow: 0 4px 15px rgba(255, 0, 127, 0.4);
    }

    .score-badge small {
      font-size: 1rem;
      font-weight: 600;
      opacity: 0.85;
    }

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

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

    .compare-table th, .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.92rem;
    }

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

    .compare-table td:first-child {
      font-weight: 600;
    }

    .compare-highlight {
      background: rgba(0, 242, 254, 0.04);
      color: var(--primary);
      font-weight: 700;
    }

    /* 案例展示区 */
    .case-card {
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }

    .case-img-wrap {
      width: 100%;
      overflow: hidden;
      background: #f1f5f9;
      aspect-ratio: 16 / 9;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .case-img-wrap.square {
      aspect-ratio: 1 / 1;
    }

    .case-img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }

    .case-card:hover .case-img {
      transform: scale(1.04);
    }

    .case-content {
      padding: 20px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }

    .case-title {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .case-desc {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 评论卡片 */
    .testimonial-card {
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .testimonial-body {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 18px;
      font-style: italic;
    }

    .testimonial-author {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .author-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: linear-gradient(135deg, #00f2fe, #7928ca);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.1rem;
    }

    .author-info h4 {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
    }

    .author-info p {
      font-size: 0.8rem;
      color: var(--text-light);
    }

    /* FAQ 手风琴 */
    .faq-accordion {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      background: #ffffff;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
      overflow: hidden;
      transition: border-color 0.25s ease;
    }

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

    .faq-question {
      width: 100%;
      padding: 18px 22px;
      text-align: left;
      background: none;
      border: none;
      cursor: pointer;
      font-size: 1.02rem;
      font-weight: 700;
      color: var(--text-main);
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
    }

    .faq-question::after {
      content: "+";
      font-size: 1.35rem;
      font-weight: 400;
      color: var(--primary);
      transition: transform 0.25s ease;
    }

    .faq-item.active .faq-question::after {
      content: "−";
    }

    .faq-answer {
      display: none;
      padding: 0 22px 20px 22px;
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

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

    /* 表单与联系模块 */
    .contact-wrapper {
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-md);
      display: grid;
      grid-template-columns: 1fr 1.2fr;
    }

    .contact-info-panel {
      background: linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%);
      color: #ffffff;
      padding: 40px 32px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .contact-info-panel h3 {
      font-size: 1.5rem;
      margin-bottom: 12px;
    }

    .contact-info-panel p {
      color: #94a3b8;
      font-size: 0.92rem;
      margin-bottom: 24px;
      line-height: 1.6;
    }

    .contact-meta-list {
      display: flex;
      flex-direction: column;
      gap: 14px;
      font-size: 0.9rem;
      margin-bottom: 30px;
    }

    .contact-meta-item strong {
      color: #00f2fe;
      margin-right: 6px;
    }

    .qrcode-box {
      background: rgba(255, 255, 255, 0.08);
      border-radius: var(--radius-sm);
      padding: 16px;
      text-align: center;
      max-width: 170px;
      border: 1px solid rgba(255, 255, 255, 0.15);
    }

    .qrcode-box img {
      width: 100%;
      height: auto;
      border-radius: 6px;
      display: block;
      margin-bottom: 8px;
    }

    .qrcode-box span {
      font-size: 0.78rem;
      color: #cbd5e1;
    }

    .contact-form-panel {
      padding: 40px 36px;
    }

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

    .form-label {
      display: block;
      font-size: 0.88rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.92rem;
      color: var(--text-main);
      background: var(--bg-main);
      outline: none;
      transition: border-color 0.2s ease, box-shadow 0.2s ease;
    }

    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
      background: #ffffff;
    }

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

    /* 资讯与友情链接 */
    .article-links-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
      gap: 12px;
      margin-top: 20px;
    }

    .article-link-item {
      background: #ffffff;
      padding: 12px 16px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
      font-size: 0.88rem;
      color: var(--text-muted);
      display: block;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }

    .article-link-item:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: #eff6ff;
    }

    .footer-links-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-top: 14px;
    }

    .footer-links-wrap a {
      font-size: 0.88rem;
      color: var(--text-muted);
      padding: 4px 10px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 6px;
    }

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

    /* 底部通用规范 */
    .site-footer {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      padding-top: 50px;
      padding-bottom: 30px;
      color: var(--text-muted);
    }

    .footer-bottom {
      margin-top: 40px;
      padding-top: 20px;
      border-top: 1px solid var(--border-color);
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 14px;
      font-size: 0.85rem;
    }

    .ai-page-home-link {
      font-weight: 700;
      color: var(--primary);
    }

    /* 悬浮客服挂件 */
    .floating-widget {
      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: #ffffff;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      color: var(--text-main);
      transition: all 0.25s ease;
      font-size: 1.1rem;
    }

    .float-btn:hover {
      background: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
      transform: scale(1.08);
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .hero-title {
        font-size: 2.2rem;
      }
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .process-grid {
        grid-template-columns: repeat(3, 1fr);
      }
      .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .header-inner {
        height: 64px;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 16px 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.show {
        display: flex;
      }
      .nav-item {
        width: 100%;
      }
      .nav-item a {
        display: block;
        padding: 10px 0;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .hero-title {
        font-size: 1.85rem;
      }
      .hero-subtitle {
        font-size: 1rem;
      }
      .grid-3, .grid-2 {
        grid-template-columns: 1fr;
      }
      .contact-wrapper {
        grid-template-columns: 1fr;
      }
      .process-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .review-score-hero {
        flex-direction: column;
        text-align: center;
      }
      .score-right {
        flex-direction: column;
      }
    }