:root {
      --primary: #e11d48;
      --primary-hover: #be123c;
      --primary-light: #fff1f2;
      --primary-glow: rgba(225, 29, 72, 0.15);
      --accent: #f43f5e;
      --accent-deep: #881337;
      --text-main: #0f172a;
      --text-sub: #475569;
      --text-muted: #64748b;
      --bg-page: #fffbfb;
      --bg-card: #ffffff;
      --border-color: #ffe4e6;
      --border-subtle: #fecdd3;
      --shadow-sm: 0 2px 8px rgba(225, 29, 72, 0.04);
      --shadow-md: 0 8px 24px rgba(225, 29, 72, 0.08);
      --shadow-lg: 0 16px 36px rgba(225, 29, 72, 0.12);
      --radius: 12px;
      --container-max: 1200px;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
      -webkit-font-smoothing: antialiased;
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.65;
      overflow-x: hidden;
    }

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

    .container {
      width: 100%;
      max-width: var(--container-max);
      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, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

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

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

    .brand-area .ai-page-logo {
      height: 38px;
      width: auto;
      display: block;
    }

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

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

    .nav-links li a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-main);
      padding: 8px 14px;
      border-radius: 6px;
      display: inline-block;
    }

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

    .nav-cta {
      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: 8px;
      cursor: pointer;
      border: 1px solid transparent;
      transition: all 0.25s ease;
      white-space: nowrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--accent) 0%, var(--primary) 100%);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(225, 29, 72, 0.3);
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-hover) 100%);
      box-shadow: 0 6px 20px rgba(225, 29, 72, 0.4);
      transform: translateY(-1px);
    }

    .btn-outline {
      background: #ffffff;
      border-color: var(--primary);
      color: var(--primary);
    }

    .btn-outline:hover {
      background: var(--primary-light);
      border-color: var(--primary-hover);
      color: var(--primary-hover);
    }

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

    /* 区域通用规范 */
    .section-padding {
      padding: 72px 0;
      position: relative;
    }

    .section-bg-alt {
      background: linear-gradient(180deg, #ffffff 0%, #fff5f6 100%);
    }

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

    .section-badge {
      display: inline-block;
      padding: 4px 14px;
      background: var(--primary-light);
      border: 1px solid var(--border-subtle);
      border-radius: 30px;
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 12px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.3;
      margin-bottom: 14px;
    }

    .section-desc {
      font-size: 1.05rem;
      color: var(--text-sub);
      line-height: 1.6;
    }

    /* 首屏 Hero (严格无图片) */
    .hero-section {
      padding: 80px 0 60px 0;
      background: radial-gradient(circle at 50% 10%, #ffe4e6 0%, #fffbfb 70%);
      position: relative;
      overflow: hidden;
      border-bottom: 1px solid var(--border-color);
    }

    .hero-container {
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
    }

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

    .hero-title {
      font-size: 2.6rem;
      font-weight: 900;
      color: var(--accent-deep);
      line-height: 1.25;
      margin-bottom: 20px;
      max-width: 900px;
      letter-spacing: -0.5px;
    }

    .hero-lead {
      font-size: 1.2rem;
      color: var(--text-sub);
      max-width: 780px;
      margin-bottom: 36px;
      font-weight: 400;
    }

    .hero-actions {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 18px;
      margin-bottom: 48px;
      flex-wrap: wrap;
    }

    .btn-hero-main {
      padding: 14px 34px;
      font-size: 1.1rem;
      border-radius: 10px;
    }

    .hero-metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      width: 100%;
      max-width: 1040px;
    }

    .metric-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px 16px;
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: transform 0.25s ease, box-shadow 0.25s ease;
    }

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

    .metric-num {
      font-size: 2rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.1;
      margin-bottom: 6px;
    }

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

    /* 平台支持模型标签滚动条 */
    .model-tags-section {
      padding: 24px 0;
      background: #ffffff;
      border-bottom: 1px solid var(--border-color);
    }

    .model-tags-title {
      font-size: 0.9rem;
      color: var(--text-muted);
      text-align: center;
      margin-bottom: 12px;
      font-weight: 600;
    }

    .model-tags-list {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 8px;
    }

    .model-tag {
      background: var(--primary-light);
      color: var(--accent-deep);
      border: 1px solid var(--border-subtle);
      font-size: 0.8rem;
      font-weight: 600;
      padding: 4px 12px;
      border-radius: 20px;
    }

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

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

    .cards-grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }

    .feature-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 28px 24px;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
    }

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

    .feature-icon-box {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.3rem;
      font-weight: 800;
      margin-bottom: 16px;
    }

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

    .feature-desc {
      font-size: 0.95rem;
      color: var(--text-sub);
      line-height: 1.6;
      flex-grow: 1;
    }

    .feature-tags {
      margin-top: 14px;
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
    }

    .feature-subtag {
      font-size: 0.75rem;
      background: #f8fafc;
      color: var(--text-muted);
      padding: 2px 8px;
      border-radius: 4px;
      border: 1px solid #e2e8f0;
    }

    /* 评测与对比板块 */
    .rating-banner {
      background: linear-gradient(135deg, var(--accent-deep) 0%, var(--primary) 100%);
      color: #ffffff;
      border-radius: var(--radius);
      padding: 32px 36px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 32px;
      box-shadow: var(--shadow-md);
    }

    .rating-info h3 {
      font-size: 1.6rem;
      font-weight: 800;
      margin-bottom: 6px;
    }

    .rating-info p {
      font-size: 1rem;
      opacity: 0.9;
    }

    .rating-score-box {
      text-align: right;
      display: flex;
      flex-direction: column;
      align-items: flex-end;
    }

    .rating-stars {
      color: #fbbf24;
      font-size: 1.5rem;
      letter-spacing: 2px;
      margin-bottom: 4px;
    }

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

    .rating-score-max {
      font-size: 1rem;
      font-weight: 500;
      opacity: 0.8;
    }

    .compare-table-wrapper {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      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);
      font-size: 0.95rem;
    }

    .compare-table th {
      background: #fff5f6;
      color: var(--accent-deep);
      font-weight: 700;
    }

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

    .compare-table .highlight-col {
      background: rgba(254, 205, 211, 0.2);
      font-weight: 700;
      color: var(--primary);
    }

    /* 流程步骤 */
    .steps-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);
      padding: 24px 20px;
      text-align: left;
      position: relative;
      box-shadow: var(--shadow-sm);
    }

    .step-number {
      font-size: 2.5rem;
      font-weight: 900;
      color: var(--border-subtle);
      line-height: 1;
      margin-bottom: 8px;
    }

    .step-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }

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

    /* 图文混排展示区 (合规引入指定图片) */
    .media-showcase-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 28px;
      align-items: center;
      margin-bottom: 36px;
    }

    .media-img-container {
      border-radius: var(--radius);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      background: #fff;
    }

    .media-img-container img {
      width: 100%;
      height: auto;
      display: block;
      transition: transform 0.3s ease;
    }

    .media-img-container:hover img {
      transform: scale(1.02);
    }

    .media-content-box h3 {
      font-size: 1.7rem;
      font-weight: 800;
      color: var(--accent-deep);
      margin-bottom: 14px;
    }

    .media-content-box p {
      font-size: 1rem;
      color: var(--text-sub);
      margin-bottom: 20px;
      line-height: 1.7;
    }

    .dual-banner-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      margin-top: 24px;
    }

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

    .review-quote {
      font-size: 0.95rem;
      color: var(--text-sub);
      line-height: 1.6;
      margin-bottom: 18px;
      position: relative;
      font-style: italic;
    }

    .reviewer-meta {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid var(--border-color);
      padding-top: 14px;
    }

    .reviewer-avatar-placeholder {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary);
      font-weight: 800;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1rem;
      border: 1px solid var(--border-subtle);
    }

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

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

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

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
      transition: border-color 0.2s ease;
    }

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

    .faq-question {
      padding: 18px 24px;
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-main);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      user-select: none;
    }

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

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

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: #fffafa;
      color: var(--text-sub);
      font-size: 0.95rem;
      line-height: 1.65;
      padding: 0 24px;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 0 24px 20px 24px;
    }

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

    .contact-form {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }

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

    .form-label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid #cbd5e1;
      border-radius: 8px;
      font-size: 0.95rem;
      color: var(--text-main);
      background: #ffffff;
      transition: border-color 0.2s ease, box-shadow 0.2s ease;
      font-family: inherit;
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(225, 29, 72, 0.15);
    }

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

    /* 联系与二维码卡片 */
    .contact-info-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 32px;
      box-shadow: var(--shadow-md);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .contact-item-row {
      display: flex;
      align-items: center;
      gap: 14px;
      margin-bottom: 16px;
    }

    .contact-icon {
      width: 40px;
      height: 40px;
      border-radius: 8px;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
    }

    .contact-detail-text h5 {
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    .contact-detail-text p {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-main);
    }

    .qrcode-box {
      text-align: center;
      background: var(--primary-light);
      border: 1px dashed var(--border-subtle);
      border-radius: 10px;
      padding: 16px;
      margin-top: 14px;
    }

    .qrcode-box img {
      max-width: 130px;
      height: auto;
      border-radius: 6px;
      margin: 0 auto 8px auto;
      display: block;
    }

    .qrcode-box span {
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--accent-deep);
    }

    /* 文章与外链 */
    .articles-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .article-item-link {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 14px 18px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      transition: all 0.2s ease;
      color: var(--text-main);
    }

    .article-item-link:hover {
      border-color: var(--primary);
      background: var(--primary-light);
      color: var(--primary);
      transform: translateX(4px);
    }

    /* 页脚 */
    .site-footer {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 56px 0 28px 0;
      color: var(--text-main);
    }

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

    .footer-brand h4 {
      font-size: 1.3rem;
      font-weight: 800;
      color: var(--accent-deep);
      margin-bottom: 12px;
    }

    .footer-brand p {
      font-size: 0.9rem;
      color: var(--text-sub);
      line-height: 1.6;
      margin-bottom: 16px;
    }

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

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

    .footer-links-list a {
      font-size: 0.9rem;
      color: var(--text-sub);
    }

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

    .friend-links-area {
      border-top: 1px solid var(--border-color);
      padding-top: 24px;
      margin-bottom: 24px;
    }

    .friend-links-title {
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }

    .friend-links-flex {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
    }

    .friend-links-flex a {
      font-size: 0.85rem;
      color: var(--text-sub);
      background: #f8fafc;
      padding: 4px 10px;
      border-radius: 4px;
      border: 1px solid #e2e8f0;
    }

    .friend-links-flex a:hover {
      color: var(--primary);
      border-color: var(--border-subtle);
      background: var(--primary-light);
    }

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

    /* 悬浮工具条 */
    .floating-tools {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .tool-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;
      color: var(--primary);
      font-size: 1.2rem;
      cursor: pointer;
      transition: all 0.25s ease;
    }

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

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

    @media (max-width: 768px) {
      .nav-links, .nav-cta .btn-outline {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      .hero-title {
        font-size: 1.85rem;
      }
      .hero-metrics-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .cards-grid-3, .cards-grid-2 {
        grid-template-columns: 1fr;
      }
      .rating-banner {
        flex-direction: column;
        text-align: center;
        gap: 16px;
      }
      .rating-score-box {
        align-items: center;
      }
      .contact-form {
        grid-template-columns: 1fr;
      }
      .form-group-full {
        grid-column: span 1;
      }
      .dual-banner-row {
        grid-template-columns: 1fr;
      }
      .footer-top-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        gap: 10px;
        text-align: center;
      }
    }