:root {
      --primary: #4f46e5;
      --primary-hover: #4338ca;
      --secondary: #ec4899;
      --accent: #06b6d4;
      --warm: #f59e0b;
      --success: #10b981;
      --bg-page: #f8fafc;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --border-color: #e2e8f0;
      --border-focus: #818cf8;
      --gradient-vibrant: linear-gradient(135deg, #4f46e5 0%, #ec4899 50%, #f59e0b 100%);
      --gradient-soft: linear-gradient(135deg, #eef2ff 0%, #fdf2f8 50%, #fef3c7 100%);
      --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, 0.05);
      --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
      --shadow-hover: 0 20px 25px -5px rgba(79, 70, 229, 0.12), 0 8px 10px -6px rgba(236, 72, 153, 0.08);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --radius-full: 9999px;
      --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, "Noto Sans", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

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

    ul, ol {
      list-style: none;
    }

    .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: 100;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

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

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

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

    .brand-title {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
    }

    .nav-links a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-muted);
      padding: 8px 14px;
      border-radius: var(--radius-sm);
      display: inline-block;
    }

    .nav-links a:hover {
      color: var(--primary);
      background-color: #f1f5f9;
    }

    .header-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-full);
      cursor: pointer;
      border: none;
      transition: var(--transition);
      text-align: center;
    }

    .btn-primary {
      background: var(--gradient-vibrant);
      color: #ffffff !important;
      box-shadow: 0 4px 12px rgba(79, 70, 229, 0.28);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(79, 70, 229, 0.4);
    }

    .btn-outline {
      background: #ffffff;
      color: var(--primary) !important;
      border: 1px solid var(--border-color);
    }

    .btn-outline:hover {
      background: #f8fafc;
      border-color: var(--primary);
      transform: translateY(-2px);
    }

    .menu-toggle {
      display: none;
      background: none;
      border: 1px solid var(--border-color);
      padding: 8px 10px;
      border-radius: var(--radius-sm);
      cursor: pointer;
      font-size: 1.2rem;
      color: var(--text-main);
    }

    /* Section 通用规范 */
    section {
      padding: 72px 0;
      position: relative;
    }

    .section-head {
      text-align: center;
      max-width: 780px;
      margin: 0 auto 48px;
    }

    .badge {
      display: inline-block;
      padding: 6px 14px;
      font-size: 0.8rem;
      font-weight: 700;
      letter-spacing: 0.5px;
      text-transform: uppercase;
      border-radius: var(--radius-full);
      background: #eef2ff;
      color: var(--primary);
      border: 1px solid #c7d2fe;
      margin-bottom: 12px;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.3;
      margin-bottom: 12px;
      letter-spacing: -0.5px;
    }

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

    /* 首屏 Hero (严格禁图) */
    .hero-section {
      padding: 90px 0 70px;
      background: radial-gradient(circle at top right, #fdf2f8 0%, #f8fafc 60%), radial-gradient(circle at bottom left, #eef2ff 0%, #f8fafc 70%);
      border-bottom: 1px solid var(--border-color);
      overflow: hidden;
      position: relative;
    }

    .hero-content {
      text-align: center;
      max-width: 920px;
      margin: 0 auto;
    }

    .hero-badge-wrap {
      display: flex;
      justify-content: center;
      gap: 10px;
      margin-bottom: 24px;
      flex-wrap: wrap;
    }

    .hero-badge {
      background: #ffffff;
      border: 1px solid #cbd5e1;
      padding: 6px 16px;
      border-radius: var(--radius-full);
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--primary);
      box-shadow: var(--shadow-sm);
    }

    .hero-title {
      font-size: 2.75rem;
      font-weight: 900;
      color: var(--text-main);
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -1px;
    }

    .hero-desc {
      font-size: 1.2rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 36px;
      max-width: 760px;
      margin-left: auto;
      margin-right: auto;
    }

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

    .btn-hero-portal {
      font-size: 1.1rem;
      padding: 14px 34px;
      background: linear-gradient(135deg, #e11d48 0%, #ec4899 50%, #8b5cf6 100%);
      color: #ffffff !important;
      font-weight: 700;
      border-radius: var(--radius-full);
      box-shadow: 0 8px 24px rgba(225, 29, 72, 0.35);
      border: 2px solid #ffffff;
    }

    .btn-hero-portal:hover {
      transform: translateY(-3px) scale(1.02);
      box-shadow: 0 12px 30px rgba(225, 29, 72, 0.5);
    }

    .hero-stats-grid {
      display: grid;
      grid-template-grid-columns: repeat(4, 1fr);
      grid-template-columns: repeat(4, 1fr);
      gap: 18px;
      text-align: left;
    }

    .stat-card {
      background: #ffffff;
      padding: 22px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

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

    .stat-num {
      font-size: 1.85rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }

    .stat-label {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 4px;
    }

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

    /* 支持模型滚动标签墙 */
    .model-ticker-section {
      padding: 24px 0;
      background: #ffffff;
      border-bottom: 1px solid var(--border-color);
    }

    .ticker-wrapper {
      display: flex;
      align-items: center;
      gap: 16px;
      overflow-x: auto;
      padding-bottom: 6px;
      white-space: nowrap;
      scrollbar-width: thin;
    }

    .ticker-title {
      font-size: 0.9rem;
      font-weight: 800;
      color: var(--primary);
      padding-right: 12px;
      border-right: 2px solid var(--border-color);
      flex-shrink: 0;
    }

    .ticker-tags {
      display: inline-flex;
      gap: 10px;
    }

    .model-chip {
      display: inline-block;
      padding: 5px 12px;
      font-size: 0.82rem;
      font-weight: 600;
      color: var(--text-main);
      background: #f1f5f9;
      border-radius: var(--radius-full);
      border: 1px solid #e2e8f0;
      transition: var(--transition);
    }

    .model-chip:hover {
      background: #e0e7ff;
      color: var(--primary);
      border-color: #c7d2fe;
    }

    /* 卡片网格统一 */
    .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: 28px;
    }

    .feature-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 26px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .feature-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
      border-color: #c7d2fe;
    }

    .card-tag {
      align-self: flex-start;
      font-size: 0.75rem;
      font-weight: 700;
      padding: 3px 10px;
      border-radius: var(--radius-full);
      background: #fdf2f8;
      color: var(--secondary);
      border: 1px solid #fbcfe8;
      margin-bottom: 14px;
    }

    .card-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }

    .card-desc {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
      flex-grow: 1;
    }

    .card-feature-list {
      border-top: 1px dashed var(--border-color);
      padding-top: 14px;
      font-size: 0.85rem;
      color: var(--text-light);
    }

    .card-feature-list li {
      margin-bottom: 6px;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .card-feature-list li::before {
      content: "✓";
      color: var(--success);
      font-weight: bold;
    }

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

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

    .step-number {
      width: 44px;
      height: 44px;
      background: var(--gradient-vibrant);
      color: #ffffff;
      font-weight: 800;
      font-size: 1.1rem;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
      box-shadow: 0 4px 10px rgba(79, 70, 229, 0.3);
    }

    .step-title {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .step-desc {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    /* 对比评测 - 突出五星9.9 */
    .comparison-section {
      background: #f1f5f9;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }

    .score-summary-card {
      background: #ffffff;
      border: 2px solid var(--primary);
      border-radius: var(--radius-lg);
      padding: 32px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 30px;
      margin-bottom: 36px;
      box-shadow: var(--shadow-lg);
      flex-wrap: wrap;
    }

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

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

    .score-meta h3 {
      font-size: 1.4rem;
      font-weight: 800;
      margin-bottom: 6px;
    }

    .rating-stars {
      color: #eab308;
      font-size: 1.3rem;
      letter-spacing: 2px;
      font-weight: bold;
    }

    .score-features-badge {
      display: flex;
      gap: 12px;
      flex-wrap: wrap;
    }

    .pill-badge {
      background: #eef2ff;
      color: var(--primary);
      padding: 8px 16px;
      border-radius: var(--radius-full);
      font-size: 0.88rem;
      font-weight: 700;
      border: 1px solid #c7d2fe;
    }

    .compare-table-wrap {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow-x: auto;
      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: #f8fafc;
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
    }

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

    .highlight-cell {
      background: #faf5ff;
      color: var(--primary);
      font-weight: 700;
    }

    /* 案例中心图片展示 */
    .media-gallery-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
      margin-bottom: 30px;
    }

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

    .media-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

    .media-img-holder {
      width: 100%;
      background: #e2e8f0;
      display: block;
      overflow: hidden;
    }

    .ai-page-image {
      width: 100%;
      height: 220px;
      object-fit: cover;
      display: block;
      transition: transform 0.4s ease;
    }

    .media-card:hover .ai-page-image {
      transform: scale(1.04);
    }

    .media-info {
      padding: 18px;
    }

    .media-info h4 {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 6px;
    }

    .media-info p {
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    /* 客户评论 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .testimonial-card {
      background: #ffffff;
      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-content {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 20px;
      font-style: normal;
    }

    .testimonial-meta {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f1f5f9;
      padding-top: 14px;
    }

    .user-avatar-circle {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--gradient-vibrant);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 1rem;
      flex-shrink: 0;
    }

    .user-info-text h5 {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
    }

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

    /* FAQ 折叠 */
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      margin-bottom: 14px;
      overflow: hidden;
      transition: var(--transition);
    }

    .faq-header {
      padding: 18px 22px;
      font-weight: 700;
      font-size: 1.02rem;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      user-select: none;
      background: #ffffff;
    }

    .faq-header:hover {
      color: var(--primary);
    }

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

    .faq-body {
      display: none;
      padding: 0 22px 20px;
      font-size: 0.93rem;
      color: var(--text-muted);
      line-height: 1.65;
      border-top: 1px solid #f8fafc;
    }

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

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

    /* 需求匹配与表单 */
    .matching-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-lg);
    }

    .contact-form-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
      margin-bottom: 20px;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    .form-group.full-width {
      grid-column: span 2;
    }

    .form-group label {
      font-size: 0.88rem;
      font-weight: 700;
      color: var(--text-main);
    }

    .form-control {
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.92rem;
      background: #f8fafc;
      color: var(--text-main);
      outline: none;
      transition: var(--transition);
      width: 100%;
    }

    .form-control:focus {
      border-color: var(--primary);
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
    }

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

    /* 资讯与友情链接 */
    .news-wrapper {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }

    .article-links-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
      margin-top: 14px;
    }

    .article-link-item {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 10px 14px;
      background: #f8fafc;
      border-radius: var(--radius-sm);
      font-size: 0.9rem;
      border: 1px solid #f1f5f9;
    }

    .article-link-item:hover {
      border-color: var(--border-focus);
      background: #eef2ff;
    }

    .friend-links-area {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 16px;
    }

    .friend-links-area a {
      font-size: 0.88rem;
      color: var(--text-muted);
      background: #f1f5f9;
      padding: 6px 14px;
      border-radius: var(--radius-full);
      border: 1px solid var(--border-color);
    }

    .friend-links-area a:hover {
      background: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
    }

    /* 底部专属统一 */
    .site-footer {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 50px 0 28px;
      color: var(--text-muted);
      font-size: 0.9rem;
    }

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

    .footer-brand h4 {
      font-size: 1.2rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .footer-col h5 {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 16px;
    }

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

    .footer-links-list a {
      color: var(--text-muted);
    }

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

    .qr-box {
      display: flex;
      flex-direction: column;
      align-items: flex-start;
      gap: 8px;
    }

    .qr-box img {
      width: 110px;
      height: 110px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      display: block;
      padding: 4px;
      background: #ffffff;
    }

    .copyright-bar {
      border-top: 1px solid var(--border-color);
      padding-top: 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 12px;
      font-size: 0.85rem;
      color: var(--text-light);
    }

    /* 浮动客服 */
    .float-widget {
      position: fixed;
      right: 24px;
      bottom: 30px;
      z-index: 99;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: var(--gradient-vibrant);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 14px rgba(79, 70, 229, 0.4);
      cursor: pointer;
      border: none;
      font-size: 1.2rem;
      transition: var(--transition);
      position: relative;
    }

    .float-btn:hover {
      transform: scale(1.08);
    }

    .float-btn .float-tooltip {
      position: absolute;
      right: 60px;
      background: #0f172a;
      color: #ffffff;
      padding: 6px 12px;
      border-radius: var(--radius-sm);
      font-size: 0.8rem;
      white-space: nowrap;
      display: none;
      box-shadow: var(--shadow-md);
    }

    .float-btn:hover .float-tooltip {
      display: block;
    }

    /* 响应式断点 */
    @media (max-width: 992px) {
      .hero-title {
        font-size: 2.2rem;
      }
      .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3, .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .step-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .media-gallery-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .testimonial-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        align-items: flex-start;
        padding: 18px 24px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-lg);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links a {
        width: 100%;
        padding: 10px 0;
      }
      .hero-title {
        font-size: 1.85rem;
      }
      .hero-stats-grid, .grid-2, .grid-3, .grid-4, .step-grid, .media-gallery-grid, .testimonial-grid {
        grid-template-columns: 1fr;
      }
      .score-summary-card {
        flex-direction: column;
        align-items: flex-start;
      }
      .contact-form-grid {
        grid-template-columns: 1fr;
      }
      .form-group.full-width {
        grid-column: span 1;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }