:root {
      --primary: #4f46e5;
      --primary-hover: #4338ca;
      --accent: #ec4899;
      --accent-glow: #f43f5e;
      --text-dark: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --bg-main: #faf5ff;
      --bg-surface: #ffffff;
      --bg-subtle: #f3e8ff;
      --border-color: #e9d5ff;
      --border-focus: #c084fc;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --shadow-sm: 0 2px 8px rgba(79, 70, 229, 0.06);
      --shadow-md: 0 8px 24px rgba(79, 70, 229, 0.08);
      --shadow-lg: 0 16px 36px rgba(236, 72, 153, 0.12);
      --transition: all 0.28s ease;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-tap-highlight-color: transparent;
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-main);
      background-image: 
        radial-gradient(at 0% 0%, rgba(236, 72, 153, 0.08) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(79, 70, 229, 0.08) 0px, transparent 50%);
      background-attachment: fixed;
      color: var(--text-dark);
      line-height: 1.65;
      overflow-x: hidden;
    }

    .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);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      transition: var(--transition);
    }

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

    .brand-box {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
    }

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

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

    .nav-menu {
      display: flex;
      align-items: center;
    }

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

    .nav-links li a,
    .ai-page-home-link {
      display: inline-block;
      padding: 8px 12px;
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-muted);
      text-decoration: none;
      transition: var(--transition);
      border-radius: var(--radius-sm);
    }

    .nav-links li a:hover,
    .ai-page-home-link:hover {
      color: var(--primary);
      background: var(--bg-subtle);
    }

    .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: 999px;
      text-decoration: none;
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      text-align: center;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary), var(--accent));
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(236, 72, 153, 0.35);
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, var(--primary-hover), var(--accent-glow));
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(236, 72, 153, 0.45);
    }

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

    .btn-outline:hover {
      background: var(--bg-subtle);
      color: var(--primary-hover);
    }

    .btn-sm {
      padding: 6px 14px;
      font-size: 0.85rem;
    }

    .nav-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
      color: var(--text-dark);
    }

    .nav-toggle svg {
      width: 24px;
      height: 24px;
      display: block;
    }

    /* Section 通用 */
    .section-wrap {
      padding: 72px 0;
      position: relative;
    }

    .section-alt {
      background-color: rgba(255, 255, 255, 0.65);
      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 auto;
    }

    .section-tag {
      display: inline-block;
      padding: 4px 14px;
      background: var(--bg-subtle);
      color: var(--primary);
      border: 1px solid var(--border-color);
      border-radius: 999px;
      font-size: 0.82rem;
      font-weight: 700;
      text-transform: uppercase;
      margin-bottom: 12px;
      letter-spacing: 0.5px;
    }

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

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

    /* Hero 首屏 (严格无图片) */
    .hero-section {
      padding: 80px 0 60px 0;
      text-align: center;
    }

    .hero-content {
      max-width: 880px;
      margin: 0 auto;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 999px;
      box-shadow: var(--shadow-sm);
      margin-bottom: 24px;
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--accent);
    }

    .hero-badge-dot {
      width: 8px;
      height: 8px;
      background: var(--accent);
      border-radius: 50%;
      box-shadow: 0 0 0 3px rgba(236, 72, 153, 0.2);
    }

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

    .hero-title .highlight {
      background: linear-gradient(135deg, var(--primary), var(--accent));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-sub {
      font-size: 1.15rem;
      color: var(--text-muted);
      margin-bottom: 36px;
      line-height: 1.7;
    }

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

    .hero-cta-group .btn {
      padding: 14px 32px;
      font-size: 1.05rem;
    }

    .stats-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 24px;
      box-shadow: var(--shadow-md);
    }

    .stat-item {
      text-align: center;
      border-right: 1px solid var(--border-color);
    }

    .stat-item:last-child {
      border-right: none;
    }

    .stat-val {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.2;
      margin-bottom: 4px;
    }

    .stat-lbl {
      font-size: 0.88rem;
      color: var(--text-light);
      font-weight: 500;
    }

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

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

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

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

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

    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: var(--bg-subtle);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      margin-bottom: 18px;
    }

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

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

    /* 模型标签云 */
    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 24px;
    }

    .model-pill {
      padding: 8px 16px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 999px;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-dark);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .model-pill:hover {
      border-color: var(--accent);
      color: var(--accent);
      transform: scale(1.04);
    }

    /* 流程步骤 */
    .timeline-steps {
      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;
      position: relative;
      box-shadow: var(--shadow-sm);
    }

    .step-num {
      width: 32px;
      height: 32px;
      border-radius: 50%;
      background: var(--primary);
      color: #ffffff;
      font-weight: 800;
      font-size: 0.9rem;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 16px;
    }

    .step-title {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text-dark);
    }

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

    /* 案例展示 (带真实素材图) */
    .case-gallery {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 20px;
      align-items: stretch;
    }

    .case-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      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;
    }

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

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

    .case-item:hover .case-img-wrap img {
      transform: scale(1.03);
    }

    .case-info {
      padding: 16px 20px;
      flex: 1;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }

    .case-tag {
      font-size: 0.78rem;
      font-weight: 700;
      color: var(--accent);
      margin-bottom: 4px;
    }

    .case-tit {
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-dark);
    }

    /* 宣传条幅素材图 */
    .promo-banners {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
      margin-top: 32px;
    }

    .banner-img-box {
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      aspect-ratio: 16 / 9;
      background: #eee;
    }

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

    /* 对比评测表格 */
    .table-container {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-md);
      overflow-x: auto;
      margin-bottom: 24px;
    }

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

    .eval-table th,
    .eval-table td {
      padding: 18px 22px;
      border-bottom: 1px solid var(--border-color);
    }

    .eval-table th {
      background: var(--bg-subtle);
      font-weight: 800;
      color: var(--text-dark);
      font-size: 1rem;
    }

    .eval-table td {
      font-size: 0.95rem;
      color: var(--text-muted);
    }

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

    .eval-highlight {
      background: rgba(79, 70, 229, 0.04);
      font-weight: 700;
      color: var(--primary) !important;
    }

    .rating-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: linear-gradient(135deg, #f59e0b, #ec4899);
      color: #ffffff;
      padding: 4px 12px;
      border-radius: 999px;
      font-weight: 800;
      font-size: 0.85rem;
    }

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

    .review-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;
    }

    .review-stars {
      color: #f59e0b;
      margin-bottom: 12px;
      font-size: 0.95rem;
    }

    .review-text {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 18px;
    }

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

    .reviewer-avatar {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--bg-subtle);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1rem;
    }

    .reviewer-name {
      font-weight: 700;
      font-size: 0.95rem;
      color: var(--text-dark);
    }

    .reviewer-role {
      font-size: 0.82rem;
      color: var(--text-light);
    }

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

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

    .faq-question {
      width: 100%;
      text-align: left;
      padding: 18px 24px;
      background: none;
      border: none;
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-dark);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: var(--transition);
    }

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

    .faq-arrow {
      width: 18px;
      height: 18px;
      transition: transform 0.3s ease;
      color: var(--text-light);
    }

    .faq-item.active .faq-arrow {
      transform: rotate(180deg);
      color: var(--primary);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s cubic-bezier(0, 1, 0, 1);
      padding: 0 24px;
      background: #ffffff;
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.65;
    }

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

    /* 表单与联系区 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-md);
    }

    .form-box {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

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

    .form-group label {
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--text-dark);
    }

    .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;
      color: var(--text-dark);
      background: #ffffff;
      outline: none;
      transition: var(--transition);
      font-family: inherit;
    }

    .form-input:focus,
    .form-select:focus,
    .form-textarea:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
    }

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

    .contact-info-panel {
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      padding-left: 20px;
      border-left: 1px solid var(--border-color);
    }

    .contact-meta-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 14px;
      margin-bottom: 24px;
    }

    .contact-meta-item {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 0.95rem;
      color: var(--text-dark);
    }

    .contact-meta-item strong {
      color: var(--text-muted);
      min-width: 90px;
    }

    .qr-block {
      display: flex;
      align-items: center;
      gap: 16px;
      background: var(--bg-subtle);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 16px;
    }

    .qr-block img {
      width: 90px;
      height: 90px;
      border-radius: var(--radius-sm);
      background: #ffffff;
      border: 1px solid var(--border-color);
    }

    .qr-desc h4 {
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 4px;
      color: var(--text-dark);
    }

    .qr-desc p {
      font-size: 0.85rem;
      color: var(--text-muted);
      line-height: 1.4;
    }

    /* 资讯与外链 */
    .article-links-box {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 16px;
    }

    .article-links-box a {
      display: inline-block;
      padding: 8px 16px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      color: var(--primary);
      text-decoration: none;
      font-size: 0.9rem;
      font-weight: 600;
      transition: var(--transition);
    }

    .article-links-box a:hover {
      border-color: var(--primary);
      background: var(--bg-subtle);
    }

    /* 页脚 */
    .site-footer {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 48px 0 32px 0;
      color: var(--text-muted);
    }

    .footer-top {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 32px;
      margin-bottom: 36px;
    }

    .footer-brand p {
      font-size: 0.9rem;
      line-height: 1.6;
      margin-top: 12px;
      max-width: 360px;
      color: var(--text-muted);
    }

    .footer-heading {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 14px;
    }

    .footer-links-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .footer-links-list a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 0.9rem;
      transition: var(--transition);
    }

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

    .friend-links-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }

    .friend-links-wrap a {
      display: inline-block;
      padding: 4px 10px;
      background: var(--bg-main);
      border: 1px solid var(--border-color);
      border-radius: 4px;
      font-size: 0.82rem;
      color: var(--text-muted);
      text-decoration: none;
      transition: var(--transition);
    }

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

    .footer-bottom {
      border-top: 1px solid var(--border-color);
      padding-top: 24px;
      text-align: center;
      font-size: 0.85rem;
      color: var(--text-light);
    }

    /* 浮动客服 */
    .floating-contact {
      position: fixed;
      right: 20px;
      bottom: 24px;
      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(--primary);
      text-decoration: none;
      transition: var(--transition);
    }

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

    /* 响应式 */
    @media (max-width: 992px) {
      .grid-3,
      .grid-4,
      .reviews-grid,
      .timeline-steps,
      .case-gallery {
        grid-template-columns: repeat(2, 1fr);
      }
      .contact-wrapper {
        grid-template-columns: 1fr;
      }
      .contact-info-panel {
        padding-left: 0;
        border-left: none;
        border-top: 1px solid var(--border-color);
        padding-top: 28px;
      }
      .footer-top {
        grid-template-columns: 1fr 1fr;
      }
      .stats-bar {
        grid-template-columns: repeat(2, 1fr);
      }
      .stat-item:nth-child(2) {
        border-right: none;
      }
      .stat-item:nth-child(n+3) {
        border-top: 1px solid var(--border-color);
        padding-top: 12px;
      }
    }

    @media (max-width: 768px) {
      .nav-menu {
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        border-bottom: 1px solid var(--border-color);
        flex-direction: column;
        padding: 16px 20px;
        display: none;
        box-shadow: var(--shadow-md);
      }
      .nav-menu.active {
        display: flex;
      }
      .nav-links {
        flex-direction: column;
        width: 100%;
        align-items: flex-start;
      }
      .nav-links li {
        width: 100%;
      }
      .nav-links li a,
      .ai-page-home-link {
        width: 100%;
        padding: 10px 0;
      }
      .header-actions {
        display: none;
      }
      .nav-toggle {
        display: block;
      }
      .hero-title {
        font-size: 2rem;
      }
      .section-title {
        font-size: 1.6rem;
      }
      .grid-3,
      .grid-4,
      .reviews-grid,
      .timeline-steps,
      .case-gallery,
      .promo-banners,
      .footer-top {
        grid-template-columns: 1fr;
      }
      .contact-wrapper {
        padding: 20px;
      }
    }