:root {
      --primary: #ff4e50;
      --primary-gradient: linear-gradient(135deg, #ff416c 0%, #ff4b2b 50%, #f9d423 100%);
      --accent-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
      --violet-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
      --bg-light: #f8fafc;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --border-color: #e2e8f0;
      --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
      --shadow-md: 0 10px 25px -5px rgba(255, 65, 108, 0.12), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
      --shadow-lg: 0 20px 35px -5px rgba(15, 23, 42, 0.08), 0 10px 15px -5px rgba(0, 0, 0, 0.03);
      --radius: 16px;
      --transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
      background-color: var(--bg-light);
      color: var(--text-main);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      line-height: 1.6;
    }

    body {
      background: radial-gradient(circle at top right, rgba(255, 75, 43, 0.05), transparent 40%),
                  radial-gradient(circle at top left, rgba(79, 172, 254, 0.05), transparent 40%),
                  #f8fafc;
      min-height: 100vh;
      overflow-x: hidden;
    }

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

    ul, ol {
      list-style: none;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
      width: 100%;
    }

    /* 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 rgba(226, 232, 240, 0.8);
      transition: var(--transition);
    }

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

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

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

    .brand-text {
      font-size: 1.25rem;
      font-weight: 800;
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      letter-spacing: -0.5px;
    }

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

    .nav-links li a {
      font-size: 0.92rem;
      font-weight: 500;
      color: var(--text-muted);
      padding: 8px 12px;
      border-radius: 8px;
    }

    .nav-links li a:hover {
      color: #ff416c;
      background: rgba(255, 65, 108, 0.06);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      border-radius: 99px;
      font-size: 0.95rem;
      font-weight: 600;
      cursor: pointer;
      border: none;
      transition: var(--transition);
      text-align: center;
    }

    .btn-primary {
      background: var(--primary-gradient);
      color: #ffffff !important;
      box-shadow: 0 4px 14px rgba(255, 75, 43, 0.35);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(255, 75, 43, 0.45);
    }

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

    .btn-secondary:hover {
      border-color: #cbd5e1;
      background: #f1f5f9;
      transform: translateY(-2px);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
      padding: 6px;
    }

    /* Hero 首屏 (无图规范) */
    .hero-section {
      padding: 70px 0 60px;
      text-align: center;
      position: relative;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      background: rgba(255, 65, 108, 0.08);
      border: 1px solid rgba(255, 65, 108, 0.2);
      border-radius: 99px;
      font-size: 0.88rem;
      font-weight: 600;
      color: #ff416c;
      margin-bottom: 24px;
    }

    .hero-title {
      font-size: clamp(1.8rem, 4vw, 2.75rem);
      font-weight: 800;
      line-height: 1.25;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-desc {
      max-width: 820px;
      margin: 0 auto 36px;
      font-size: 1.12rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

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

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      max-width: 960px;
      margin: 0 auto;
    }

    .stat-card {
      background: #ffffff;
      padding: 20px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: var(--transition);
    }

    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(255, 65, 108, 0.3);
    }

    .stat-num {
      font-size: 1.75rem;
      font-weight: 800;
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      display: block;
      margin-bottom: 4px;
    }

    .stat-label {
      font-size: 0.85rem;
      color: var(--text-light);
      font-weight: 500;
    }

    /* Section 通用规范 */
    .section-wrap {
      padding: 70px 0;
      position: relative;
    }

    .section-alt {
      background-color: #ffffff;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 48px;
    }

    .section-tag {
      font-size: 0.82rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: #ff416c;
      margin-bottom: 8px;
      display: block;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
    }

    .section-subtitle {
      font-size: 1rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 模型与特性标签流 */
    .model-pills {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 24px;
    }

    .model-pill {
      background: #f1f5f9;
      color: var(--text-muted);
      padding: 6px 14px;
      border-radius: 99px;
      font-size: 0.85rem;
      font-weight: 600;
      border: 1px solid #e2e8f0;
      transition: var(--transition);
    }

    .model-pill:hover {
      background: #ffffff;
      border-color: #ff416c;
      color: #ff416c;
      transform: translateY(-2px);
    }

    /* 网格卡片系统 */
    .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;
      align-items: center;
    }

    .feature-card {
      background: var(--bg-card);
      border-radius: var(--radius);
      padding: 28px 24px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      height: 100%;
    }

    .feature-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-lg);
      border-color: rgba(255, 65, 108, 0.3);
    }

    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 1.3rem;
      margin-bottom: 18px;
      color: #ffffff;
      background: var(--primary-gradient);
    }

    .icon-blue { background: var(--accent-gradient); }
    .icon-purple { background: var(--violet-gradient); }

    .card-title {
      font-size: 1.18rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }

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

    .card-tag {
      display: inline-block;
      align-self: flex-start;
      margin-top: 14px;
      font-size: 0.78rem;
      font-weight: 600;
      color: #ff416c;
      background: rgba(255, 65, 108, 0.08);
      padding: 4px 10px;
      border-radius: 6px;
    }

    /* 视觉素材画廊 */
    .media-card {
      border-radius: var(--radius);
      overflow: hidden;
      background: #ffffff;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

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

    .media-img-box {
      width: 100%;
      aspect-ratio: 16/9;
      overflow: hidden;
      background: #f1f5f9;
    }

    .media-img-box.square {
      aspect-ratio: 1/1;
    }

    .media-img-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: transform 0.4s ease;
    }

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

    .media-content {
      padding: 18px;
    }

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

    .step-item {
      background: #ffffff;
      padding: 24px 20px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      position: relative;
      transition: var(--transition);
    }

    .step-item:hover {
      border-color: #ff416c;
      transform: translateY(-4px);
    }

    .step-num {
      width: 36px;
      height: 36px;
      background: var(--primary-gradient);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1rem;
      margin-bottom: 14px;
    }

    /* 对比评测专属样式 */
    .review-score-banner {
      background: linear-gradient(135deg, #0f172a 0%, #1e293b 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: 24px;
      box-shadow: var(--shadow-lg);
    }

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

    .big-score {
      font-size: 3.5rem;
      font-weight: 900;
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      line-height: 1;
    }

    .score-stars {
      color: #f59e0b;
      font-size: 1.4rem;
      letter-spacing: 2px;
    }

    .table-container {
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      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);
      font-size: 0.92rem;
    }

    .compare-table th {
      background: #f8fafc;
      font-weight: 700;
      color: var(--text-main);
    }

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

    .highlight-cell {
      background: rgba(255, 65, 108, 0.04);
      font-weight: 700;
      color: #ff416c;
    }

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

    .testimonial-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(255, 65, 108, 0.25);
    }

    .testimonial-text {
      font-size: 0.94rem;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 18px;
    }

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

    .user-avatar-badge {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--primary-gradient);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.9rem;
    }

    .user-name {
      font-size: 0.92rem;
      font-weight: 700;
      color: var(--text-main);
    }

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

    /* FAQ 折叠面板 */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .faq-item {
      background: #ffffff;
      border-radius: 12px;
      border: 1px solid var(--border-color);
      overflow: hidden;
      transition: var(--transition);
    }

    .faq-item.active {
      border-color: #ff416c;
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      padding: 18px 24px;
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      user-select: none;
    }

    .faq-question:hover {
      color: #ff416c;
    }

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

    .faq-item.active .faq-icon {
      transform: rotate(180deg);
      color: #ff416c;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
      padding: 0 24px;
      color: var(--text-muted);
      font-size: 0.92rem;
      line-height: 1.65;
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
      padding-bottom: 20px;
    }

    /* 需求匹配表单与联系 */
    .form-box {
      background: #ffffff;
      border-radius: var(--radius);
      padding: 36px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
    }

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

    .form-label {
      display: block;
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: 10px;
      font-size: 0.92rem;
      color: var(--text-main);
      background: #f8fafc;
      transition: var(--transition);
      outline: none;
    }

    .form-control:focus {
      border-color: #ff416c;
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(255, 65, 108, 0.12);
    }

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

    .contact-info-list {
      display: flex;
      flex-direction: column;
      gap: 18px;
      margin-top: 24px;
    }

    .contact-item {
      display: flex;
      align-items: flex-start;
      gap: 14px;
    }

    .contact-badge {
      width: 38px;
      height: 38px;
      border-radius: 10px;
      background: rgba(255, 65, 108, 0.1);
      color: #ff416c;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.1rem;
      flex-shrink: 0;
    }

    /* 咨询客服二维码卡 */
    .qr-card {
      background: #ffffff;
      border-radius: var(--radius);
      padding: 24px;
      border: 1px solid var(--border-color);
      text-align: center;
      box-shadow: var(--shadow-sm);
    }

    .qr-img-box {
      width: 160px;
      height: 160px;
      margin: 0 auto 14px;
      border-radius: 12px;
      overflow: hidden;
      border: 1px solid var(--border-color);
      padding: 8px;
      background: #fff;
    }

    .qr-img-box img {
      width: 100%;
      height: 100%;
      object-fit: contain;
      display: block;
    }

    /* 行业资讯 & 最新文章 */
    .article-links-box {
      background: #ffffff;
      border-radius: var(--radius);
      padding: 24px;
      border: 1px solid var(--border-color);
    }

    .article-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .article-link-item {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 12px 16px;
      border-radius: 8px;
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      color: var(--text-main);
      font-size: 0.92rem;
      font-weight: 500;
    }

    .article-link-item:hover {
      background: #ffffff;
      border-color: #ff416c;
      color: #ff416c;
      padding-left: 20px;
    }

    /* 友情链接与通用页脚 */
    .site-footer {
      background-color: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px;
      border-top: 1px solid #1e293b;
      font-size: 0.9rem;
    }

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

    .footer-col h4 {
      color: #ffffff;
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 18px;
    }

    .footer-col ul {
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .footer-col a {
      color: #94a3b8;
    }

    .footer-col a:hover {
      color: #ff416c;
    }

    .footer-links-row {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      margin-bottom: 24px;
    }

    .links-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      margin-top: 10px;
    }

    .links-tags a {
      color: #cbd5e1;
      background: #1e293b;
      padding: 4px 12px;
      border-radius: 6px;
      font-size: 0.82rem;
    }

    .links-tags a:hover {
      background: #ff416c;
      color: #ffffff;
    }

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      text-align: center;
      font-size: 0.82rem;
      color: #64748b;
    }

    /* 浮动工具栏 */
    .floating-tools {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 99;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 46px;
      height: 46px;
      background: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 6px 16px rgba(0,0,0,0.12);
      border: 1px solid var(--border-color);
      color: var(--text-main);
      cursor: pointer;
      font-size: 1.1rem;
      transition: var(--transition);
    }

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

    /* 响应式调整 */
    @media (max-width: 1024px) {
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .steps-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 16px 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-lg);
      }
      .nav-links.show {
        display: flex;
      }
      .mobile-menu-btn {
        display: block;
      }
      .grid-3, .grid-2 {
        grid-template-columns: 1fr;
      }
      .grid-4, .hero-stats-grid, .steps-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .review-score-banner {
        flex-direction: column;
        text-align: center;
      }
      .review-score-box {
        flex-direction: column;
      }
    }