/* 全局变量与荧光科技浅色风格 */
    :root {
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --bg-alt: #f1f5f9;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --neon-cyan: #06b6d4;
      --neon-blue: #2563eb;
      --neon-purple: #7c3aed;
      --neon-emerald: #059669;
      --neon-pink: #db2777;
      --border-color: #e2e8f0;
      --border-glow: rgba(6, 182, 212, 0.35);
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
      --shadow-md: 0 4px 20px -2px rgba(15, 23, 42, 0.08);
      --shadow-neon: 0 10px 25px -5px rgba(6, 182, 212, 0.25);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
      background-image: 
        radial-gradient(circle at 10% 10%, rgba(6, 182, 212, 0.06) 0%, transparent 40%),
        radial-gradient(circle at 90% 40%, rgba(124, 58, 237, 0.06) 0%, transparent 45%),
        radial-gradient(circle at 30% 80%, rgba(5, 150, 105, 0.05) 0%, transparent 40%);
      background-attachment: fixed;
    }

    /* 统一居中容器体系 */
    .container {
      width: 100%;
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 标题与排版 */
    h1, h2, h3, h4 {
      color: var(--text-main);
      font-weight: 700;
      line-height: 1.3;
    }

    .section-header {
      text-align: center;
      margin-bottom: 48px;
    }

    .section-badge {
      display: inline-flex;
      align-items: center;
      padding: 6px 16px;
      font-size: 0.875rem;
      font-weight: 600;
      color: var(--neon-blue);
      background: rgba(37, 99, 235, 0.08);
      border: 1px solid rgba(37, 99, 235, 0.2);
      border-radius: 9999px;
      margin-bottom: 12px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 2.1rem;
      letter-spacing: -0.02em;
      margin-bottom: 12px;
      color: #0b1329;
    }

    .section-subtitle {
      font-size: 1.05rem;
      color: var(--text-muted);
      max-width: 720px;
      margin: 0 auto;
    }

    /* 顶部导航 */
    .header-nav {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 10px rgba(0,0,0,0.03);
    }

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

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

    .brand-box .ai-page-logo {
      height: 40px;
      width: auto;
      object-fit: contain;
    }

    .brand-title {
      font-size: 1.25rem;
      font-weight: 800;
      background: linear-gradient(135deg, #0284c7, #7c3aed);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      letter-spacing: -0.5px;
    }

    /* 规则严格执行：.nav-links 的 gap 属性设置为 0 */
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }

    .nav-links li a {
      display: block;
      padding: 8px 14px;
      color: var(--text-muted);
      font-weight: 500;
      font-size: 0.93rem;
      text-decoration: none;
      transition: var(--transition);
      border-radius: var(--radius-sm);
    }

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

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: var(--radius-sm);
      text-decoration: none;
      transition: var(--transition);
      cursor: pointer;
      border: 1px solid transparent;
      white-space: nowrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--neon-cyan), var(--neon-blue));
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(37, 99, 235, 0.45);
      color: #ffffff;
    }

    .btn-glow {
      background: linear-gradient(135deg, #06b6d4, #7c3aed);
      color: #ffffff;
      box-shadow: var(--shadow-neon);
    }

    .btn-glow:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 25px rgba(124, 58, 237, 0.4);
      color: #ffffff;
    }

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

    .btn-outline:hover {
      border-color: var(--neon-cyan);
      color: var(--neon-blue);
      background: rgba(6, 182, 212, 0.05);
    }

    .nav-toggle {
      display: none;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 8px;
    }

    .nav-toggle span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--text-main);
      margin: 5px 0;
      transition: var(--transition);
    }

    /* 首屏 Hero - 严格禁止出现任何图片 */
    .hero-section {
      padding: 80px 0 60px;
      position: relative;
      text-align: center;
    }

    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      border-radius: 9999px;
      background: #ffffff;
      border: 1px solid var(--border-glow);
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--neon-blue);
      box-shadow: var(--shadow-sm);
      margin-bottom: 24px;
    }

    .hero-tag .pulse-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--neon-cyan);
      box-shadow: 0 0 10px var(--neon-cyan);
    }

    .hero-title {
      font-size: 2.75rem;
      font-weight: 900;
      line-height: 1.25;
      margin-bottom: 20px;
      color: #0b1329;
      letter-spacing: -0.03em;
    }

    .hero-desc {
      font-size: 1.2rem;
      color: var(--text-muted);
      max-width: 820px;
      margin: 0 auto 36px;
      line-height: 1.7;
    }

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

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

    .stat-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px 20px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      position: relative;
      overflow: hidden;
    }

    .stat-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 3px;
      background: linear-gradient(90deg, var(--neon-cyan), var(--neon-purple));
      opacity: 0;
      transition: var(--transition);
    }

    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(6, 182, 212, 0.4);
    }

    .stat-card:hover::before {
      opacity: 1;
    }

    .stat-value {
      font-size: 2.2rem;
      font-weight: 800;
      color: #0f172a;
      line-height: 1;
      margin-bottom: 8px;
      letter-spacing: -1px;
    }

    .stat-label {
      font-size: 0.92rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 区域通用设置 */
    .section-py {
      padding: 70px 0;
    }

    .bg-light-alt {
      background-color: var(--bg-alt);
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }

    /* 模型聚合胶囊墙 */
    .models-stream {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
      max-width: 1080px;
      margin: 0 auto;
    }

    .model-chip {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      padding: 8px 16px;
      border-radius: 9999px;
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--text-main);
      box-shadow: 0 2px 5px rgba(0,0,0,0.02);
      transition: var(--transition);
    }

    .model-chip:hover {
      border-color: var(--neon-cyan);
      background: #ffffff;
      color: var(--neon-blue);
      box-shadow: 0 4px 12px rgba(6, 182, 212, 0.2);
      transform: translateY(-2px);
    }

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

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 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: 28px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: flex-start;
    }

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

    .feature-icon-box {
      width: 48px;
      height: 48px;
      border-radius: var(--radius-sm);
      background: linear-gradient(135deg, rgba(6, 182, 212, 0.12), rgba(124, 58, 237, 0.12));
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--neon-blue);
      font-weight: 800;
      font-size: 1.25rem;
    }

    .feature-title {
      font-size: 1.25rem;
      margin-bottom: 12px;
      color: var(--text-main);
    }

    .feature-text {
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.65;
    }

    /* 案例展示与图文区块 */
    .showcase-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .showcase-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .showcase-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
      border-color: var(--neon-cyan);
    }

    .showcase-img-wrap {
      width: 100%;
      height: 210px;
      overflow: hidden;
      background: var(--bg-alt);
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .showcase-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: var(--transition);
    }

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

    .showcase-body {
      padding: 20px;
    }

    .showcase-tag {
      font-size: 0.78rem;
      font-weight: 700;
      color: var(--neon-cyan);
      text-transform: uppercase;
      letter-spacing: 0.5px;
      margin-bottom: 6px;
      display: block;
    }

    .showcase-title {
      font-size: 1.15rem;
      margin-bottom: 8px;
    }

    .showcase-desc {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

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

    .process-step {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px 16px;
      text-align: center;
      position: relative;
      box-shadow: var(--shadow-sm);
    }

    .step-num {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--neon-blue), var(--neon-cyan));
      color: #ffffff;
      font-weight: 800;
      font-size: 1rem;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 14px;
    }

    .step-title {
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .step-desc {
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    /* 对比评测表格与卡片 */
    .review-score-panel {
      background: linear-gradient(135deg, #ffffff, #f0f9ff);
      border: 2px solid rgba(6, 182, 212, 0.4);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-neon);
      margin-bottom: 40px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 24px;
    }

    .score-badge-box {
      display: flex;
      align-items: center;
      gap: 24px;
    }

    .score-circle {
      width: 96px;
      height: 96px;
      border-radius: 50%;
      background: linear-gradient(135deg, #0284c7, #06b6d4);
      color: #ffffff;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      box-shadow: 0 6px 20px rgba(6, 182, 212, 0.4);
    }

    .score-num {
      font-size: 2.2rem;
      font-weight: 900;
      line-height: 1;
    }

    .score-total {
      font-size: 0.75rem;
      opacity: 0.9;
    }

    .score-details h3 {
      font-size: 1.6rem;
      margin-bottom: 6px;
    }

    .score-stars {
      color: #f59e0b;
      font-size: 1.25rem;
      letter-spacing: 2px;
      margin-bottom: 6px;
    }

    .score-details p {
      color: var(--text-muted);
      font-size: 0.95rem;
    }

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

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 680px;
    }

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

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

    .compare-table tr:hover td {
      background: rgba(6, 182, 212, 0.03);
    }

    .tag-highlight {
      display: inline-block;
      padding: 4px 10px;
      background: rgba(5, 150, 105, 0.1);
      color: var(--neon-emerald);
      border-radius: 6px;
      font-weight: 600;
      font-size: 0.85rem;
    }

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

    .testimonial-header {
      display: flex;
      align-items: center;
      gap: 14px;
      margin-bottom: 16px;
    }

    .user-avatar {
      width: 46px;
      height: 46px;
      border-radius: 50%;
      background: linear-gradient(135deg, #0284c7, #8b5cf6);
      color: #ffffff;
      font-weight: 700;
      font-size: 1.1rem;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .user-info h4 {
      font-size: 1.05rem;
      margin-bottom: 2px;
    }

    .user-role {
      font-size: 0.85rem;
      color: var(--text-light);
    }

    .testimonial-content {
      color: var(--text-muted);
      font-size: 0.93rem;
      line-height: 1.6;
      font-style: italic;
    }

    /* FAQ 手风琴 */
    .faq-container {
      max-width: 880px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .faq-question {
      padding: 20px 24px;
      width: 100%;
      text-align: left;
      background: transparent;
      border: none;
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-main);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }

    .faq-question:hover {
      color: var(--neon-blue);
    }

    .faq-icon {
      font-size: 1.4rem;
      transition: var(--transition);
      color: var(--neon-cyan);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
      background: #fafbfc;
      border-top: 1px solid transparent;
    }

    .faq-answer-inner {
      padding: 20px 24px;
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.7;
    }

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

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

    /* 需求匹配与表单 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1.2fr 1fr;
      gap: 36px;
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-md);
    }

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

    .form-label {
      display: block;
      font-size: 0.92rem;
      font-weight: 600;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      background: #ffffff;
      color: var(--text-main);
      transition: var(--transition);
      outline: none;
    }

    .form-input:focus, .form-select:focus, .form-textarea:focus {
      border-color: var(--neon-cyan);
      box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.15);
    }

    .form-textarea {
      resize: vertical;
      min-height: 120px;
    }

    .contact-info-panel {
      background: var(--bg-alt);
      border-radius: var(--radius-md);
      padding: 30px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .contact-item {
      margin-bottom: 18px;
    }

    .contact-item strong {
      display: block;
      font-size: 0.9rem;
      color: var(--text-light);
      margin-bottom: 4px;
    }

    .contact-item span {
      font-size: 1.05rem;
      font-weight: 600;
      color: var(--text-main);
    }

    .qr-box {
      text-align: center;
      margin-top: 15px;
      padding-top: 15px;
      border-top: 1px dashed var(--border-color);
    }

    .qr-box img {
      width: 130px;
      height: 130px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
      padding: 4px;
      background: #ffffff;
      margin-bottom: 8px;
    }

    /* 文章列表 */
    .article-list {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
    }

    .article-item {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .article-item:hover {
      border-color: var(--neon-cyan);
      transform: translateY(-2px);
    }

    .article-item a {
      color: var(--text-main);
      font-weight: 700;
      font-size: 1.05rem;
      text-decoration: none;
      margin-bottom: 8px;
      display: block;
      transition: var(--transition);
    }

    .article-item a:hover {
      color: var(--neon-blue);
    }

    .article-date {
      font-size: 0.85rem;
      color: var(--text-light);
    }

    /* 页脚结构与友情链接 */
    .site-footer {
      background-color: #0b1329;
      color: #94a3b8;
      padding: 60px 0 30px;
      border-top: 1px solid #1e293b;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 36px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      color: #ffffff;
      font-size: 1.1rem;
      margin-bottom: 18px;
    }

    .footer-links {
      list-style: none;
    }

    .footer-links li {
      margin-bottom: 10px;
    }

    .footer-links a {
      color: #94a3b8;
      text-decoration: none;
      font-size: 0.92rem;
      transition: var(--transition);
    }

    .footer-links a:hover {
      color: #38bdf8;
      padding-left: 4px;
    }

    .friend-links-box {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }

    .friend-links-box a {
      color: #cbd5e1;
      text-decoration: none;
      font-size: 0.88rem;
      background: #1e293b;
      padding: 6px 12px;
      border-radius: 4px;
      transition: var(--transition);
    }

    .friend-links-box a:hover {
      background: #0284c7;
      color: #ffffff;
    }

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      text-align: center;
      font-size: 0.88rem;
      color: #64748b;
    }

    /* 悬浮客服面板 */
    .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-glow);
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--neon-blue);
      cursor: pointer;
      text-decoration: none;
      font-size: 1.2rem;
      transition: var(--transition);
    }

    .float-btn:hover {
      background: var(--neon-blue);
      color: #ffffff;
      transform: scale(1.1);
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      .hero-title { font-size: 2.2rem; }
      .hero-stats-grid { grid-template-columns: repeat(2, 1fr); }
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .showcase-grid { grid-template-columns: repeat(2, 1fr); }
      .process-timeline { grid-template-columns: repeat(3, 1fr); }
      .contact-wrapper { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
      .nav-links { display: none; }
      .nav-toggle { display: block; }
    }

    @media (max-width: 640px) {
      .hero-title { font-size: 1.8rem; }
      .hero-stats-grid { grid-template-columns: 1fr; }
      .grid-3, .grid-2, .grid-4 { grid-template-columns: 1fr; }
      .showcase-grid { grid-template-columns: 1fr; }
      .process-timeline { grid-template-columns: repeat(2, 1fr); }
      .article-list { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .review-score-panel { flex-direction: column; text-align: center; }
      .score-badge-box { flex-direction: column; }
    }