:root {
      --primary: #10b981;
      --primary-dark: #059669;
      --primary-light: #d1fae5;
      --primary-subtle: #ecfdf5;
      --accent-mint: #34d399;
      --accent-teal: #0f766e;
      --bg-main: #f7faf8;
      --bg-surface: #ffffff;
      --bg-card: #ffffff;
      --text-main: #1e293b;
      --text-muted: #475569;
      --text-light: #64748b;
      --border-color: #e2e8f0;
      --border-focus: #10b981;
      --shadow-sm: 0 2px 8px rgba(16, 185, 129, 0.06);
      --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.06);
      --shadow-lg: 0 16px 32px rgba(16, 185, 129, 0.1);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --container-max: 1200px;
      --transition: all 0.28s ease;
    }

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

    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);
      color: var(--text-main);
      line-height: 1.68;
      -webkit-font-smoothing: antialiased;
      background-image: 
        radial-gradient(at 0% 0%, rgba(16, 185, 129, 0.05) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(52, 211, 153, 0.04) 0px, transparent 50%);
      background-attachment: fixed;
    }

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

    ul, ol {
      list-style: none;
    }

    .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, 0.94);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(16, 185, 129, 0.15);
      box-shadow: 0 2px 12px rgba(0, 0, 0, 0.03);
    }

    .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: 700;
      color: var(--accent-teal);
      letter-spacing: -0.5px;
    }

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

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

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

    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--primary-dark);
      background-color: var(--primary-subtle);
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 10px;
      margin-left: 12px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 9px 20px;
      font-size: 0.92rem;
      font-weight: 600;
      border-radius: var(--radius-sm);
      border: 1px solid transparent;
      cursor: pointer;
      transition: var(--transition);
      text-align: center;
      white-space: nowrap;
    }

    .btn-primary {
      background-color: var(--primary);
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(16, 185, 129, 0.28);
    }

    .btn-primary:hover {
      background-color: var(--primary-dark);
      box-shadow: 0 6px 16px rgba(5, 150, 105, 0.35);
      color: #ffffff;
      transform: translateY(-1px);
    }

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

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

    .btn-hero {
      padding: 13px 30px;
      font-size: 1.05rem;
      font-weight: 700;
      border-radius: 30px;
    }

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

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

    /* 区域通用样式 */
    section {
      padding: 72px 0;
      position: relative;
    }

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

    .section-badge {
      display: inline-block;
      padding: 4px 14px;
      font-size: 0.82rem;
      font-weight: 600;
      color: var(--accent-teal);
      background-color: var(--primary-light);
      border-radius: 20px;
      margin-bottom: 12px;
      text-transform: uppercase;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 12px;
      letter-spacing: -0.5px;
    }

    .section-desc {
      font-size: 1rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 首屏 Hero 无图片设计 */
    .hero-section {
      padding: 80px 0 60px 0;
      background: linear-gradient(180deg, #ecfdf5 0%, #f7faf8 100%);
      border-bottom: 1px solid rgba(16, 185, 129, 0.12);
      position: relative;
      overflow: hidden;
    }

    .hero-inner {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
    }

    .hero-pill {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: #ffffff;
      border: 1px solid rgba(16, 185, 129, 0.3);
      border-radius: 30px;
      color: var(--accent-teal);
      font-size: 0.88rem;
      font-weight: 600;
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
    }

    .hero-pill-dot {
      width: 8px;
      height: 8px;
      background-color: var(--primary);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--primary);
    }

    .hero-title {
      font-size: 2.55rem;
      font-weight: 800;
      line-height: 1.25;
      color: #0f172a;
      margin-bottom: 20px;
      letter-spacing: -0.8px;
    }

    .hero-title-highlight {
      color: var(--primary-dark);
      position: relative;
      display: inline-block;
    }

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 780px;
      margin: 0 auto 32px auto;
      line-height: 1.7;
    }

    .hero-actions {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 40px;
    }

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 20px;
    }

    .hero-stat-card {
      background: #ffffff;
      padding: 18px 14px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      text-align: center;
    }

    .hero-stat-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
      border-color: var(--accent-mint);
    }

    .hero-stat-num {
      font-size: 1.75rem;
      font-weight: 800;
      color: var(--primary-dark);
      margin-bottom: 4px;
    }

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

    /* 平台支持模型标签流 */
    .models-bar {
      padding: 30px 0;
      background: #ffffff;
      border-bottom: 1px solid var(--border-color);
    }

    .models-title {
      text-align: center;
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--text-light);
      margin-bottom: 16px;
      text-transform: uppercase;
      letter-spacing: 1px;
    }

    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 8px;
    }

    .tag-item {
      display: inline-block;
      padding: 5px 12px;
      font-size: 0.82rem;
      font-weight: 600;
      color: var(--text-muted);
      background: var(--bg-main);
      border: 1px solid var(--border-color);
      border-radius: 6px;
      transition: var(--transition);
    }

    .tag-item:hover {
      background: var(--primary-subtle);
      color: var(--primary-dark);
      border-color: var(--primary);
    }

    /* 通用卡片网格 */
    .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-radius: var(--radius-md);
      padding: 26px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

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

    .feature-icon-box {
      width: 46px;
      height: 46px;
      border-radius: 10px;
      background: var(--primary-subtle);
      color: var(--primary-dark);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.25rem;
      font-weight: bold;
      margin-bottom: 16px;
    }

    .feature-card-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }

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

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

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

    .step-badge {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 32px;
      height: 32px;
      background: var(--primary);
      color: #ffffff;
      font-weight: 700;
      font-size: 0.9rem;
      border-radius: 50%;
      margin-bottom: 14px;
    }

    .step-title {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .step-desc {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.55;
    }

    /* 案例中心配图 */
    .case-media-box {
      border-radius: var(--radius-md);
      overflow: hidden;
      margin-bottom: 16px;
      background: #e2e8f0;
      aspect-ratio: 16 / 9;
      display: flex;
      align-items: center;
      justify-content: center;
    }

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

    .case-media-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: var(--transition);
    }

    .feature-card:hover .case-media-box img {
      transform: scale(1.03);
    }

    /* 宣传图画廊 */
    .gallery-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 30px;
    }

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

    .gallery-item img {
      width: 100%;
      height: auto;
      display: block;
      transition: var(--transition);
    }

    .gallery-item:hover img {
      transform: scale(1.04);
    }

    /* 对比评测表格与卡片 */
    .review-score-hero {
      background: linear-gradient(135deg, #065f46 0%, #047857 100%);
      color: #ffffff;
      border-radius: var(--radius-lg);
      padding: 36px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 32px;
      box-shadow: var(--shadow-lg);
    }

    .review-score-left h3 {
      font-size: 1.5rem;
      font-weight: 800;
      margin-bottom: 8px;
    }

    .review-score-left p {
      font-size: 0.95rem;
      opacity: 0.9;
    }

    .review-score-box {
      text-align: right;
    }

    .score-stars {
      color: #fbbf24;
      font-size: 1.3rem;
      margin-bottom: 4px;
    }

    .score-digits {
      font-size: 2.8rem;
      font-weight: 900;
      line-height: 1;
    }

    .score-max {
      font-size: 1.1rem;
      opacity: 0.8;
      font-weight: 500;
    }

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

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.92rem;
    }

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

    .compare-table th {
      background-color: var(--primary-subtle);
      color: var(--accent-teal);
      font-weight: 700;
      white-space: nowrap;
    }

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

    .compare-table tr:hover td {
      background-color: #fafdfb;
    }

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

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

    .testimonial-quote {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 18px;
    }

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

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

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

    .user-meta-role {
      font-size: 0.78rem;
      color: var(--text-light);
    }

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

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

    .faq-item:hover {
      border-color: var(--accent-mint);
    }

    .faq-question {
      padding: 18px 20px;
      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-icon {
      font-size: 1.2rem;
      color: var(--primary);
      transition: transform 0.25s ease;
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
      background: var(--bg-main);
      border-top: 1px solid transparent;
    }

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

    .faq-answer-inner {
      padding: 16px 20px;
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 表单与联系 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 32px;
      align-items: start;
    }

    .contact-info-card {
      background: #ffffff;
      padding: 32px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .contact-item {
      display: flex;
      align-items: flex-start;
      gap: 14px;
      margin-bottom: 20px;
    }

    .contact-icon {
      width: 36px;
      height: 36px;
      background: var(--primary-subtle);
      color: var(--primary-dark);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      flex-shrink: 0;
    }

    .contact-text-title {
      font-size: 0.85rem;
      color: var(--text-light);
      margin-bottom: 2px;
    }

    .contact-text-val {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-main);
    }

    .contact-qr-box {
      text-align: center;
      margin-top: 24px;
      padding-top: 20px;
      border-top: 1px dashed var(--border-color);
    }

    .contact-qr-box img {
      max-width: 140px;
      height: auto;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
      margin-bottom: 8px;
    }

    .form-card {
      background: #ffffff;
      padding: 32px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

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

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

    .form-control {
      width: 100%;
      padding: 11px 14px;
      font-size: 0.92rem;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      background-color: var(--bg-main);
      color: var(--text-main);
      outline: none;
      transition: var(--transition);
      font-family: inherit;
    }

    .form-control:focus {
      border-color: var(--border-focus);
      background-color: #ffffff;
      box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.12);
    }

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

    /* 文章列表与资讯 */
    .article-list {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .article-item {
      background: #ffffff;
      border-radius: var(--radius-md);
      padding: 22px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .article-item:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary);
    }

    .article-badge {
      font-size: 0.75rem;
      font-weight: 600;
      color: var(--accent-teal);
      background: var(--primary-subtle);
      padding: 3px 8px;
      border-radius: 4px;
      align-self: flex-start;
      margin-bottom: 10px;
    }

    .article-item-title {
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
      line-height: 1.45;
    }

    .article-item-desc {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.55;
      margin-bottom: 16px;
    }

    .article-link {
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--primary-dark);
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    .article-link:hover {
      color: var(--accent-teal);
    }

    /* 底部通用规范 */
    .site-footer {
      background-color: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 56px 0 28px 0;
      color: var(--text-muted);
      font-size: 0.9rem;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 32px;
      margin-bottom: 40px;
    }

    .footer-col-title {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 16px;
    }

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

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

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

    .friend-links-box {
      border-top: 1px solid var(--border-color);
      padding-top: 20px;
      margin-bottom: 24px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 14px;
      font-size: 0.85rem;
    }

    .friend-links-label {
      font-weight: 700;
      color: var(--text-main);
    }

    .friend-links-box a {
      color: var(--text-muted);
      background: var(--bg-main);
      padding: 4px 10px;
      border-radius: 4px;
      border: 1px solid var(--border-color);
    }

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

    .footer-bottom {
      border-top: 1px solid var(--border-color);
      padding-top: 20px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-size: 0.82rem;
      color: var(--text-light);
    }

    /* 悬浮工具栏 */
    .floating-bar {
      position: fixed;
      right: 20px;
      bottom: 28px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #ffffff;
      border: 1px solid var(--border-color);
      color: var(--accent-teal);
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: var(--shadow-md);
      cursor: pointer;
      transition: var(--transition);
      font-size: 0.9rem;
      font-weight: bold;
    }

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

    /* 响应式样式适配 */
    @media (max-width: 992px) {
      .grid-4, .hero-stats-grid, .workflow-steps, .gallery-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3, .article-list {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .contact-grid {
        grid-template-columns: 1fr;
      }
      .hero-title {
        font-size: 2.1rem;
      }
    }

    @media (max-width: 768px) {
      .nav-toggle {
        display: block;
      }
      .nav-menu {
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        align-items: flex-start;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
        display: none;
      }
      .nav-menu.show {
        display: flex;
      }
      .nav-links {
        flex-direction: column;
        width: 100%;
        align-items: flex-start;
      }
      .nav-links li {
        width: 100%;
      }
      .nav-links li a {
        padding: 10px 0;
      }
      .nav-actions {
        margin-left: 0;
        margin-top: 14px;
        width: 100%;
        justify-content: stretch;
      }
      .nav-actions .btn {
        flex: 1;
      }
      .grid-3, .grid-2, .grid-4, .hero-stats-grid, .workflow-steps, .gallery-grid, .article-list, .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero-title {
        font-size: 1.75rem;
      }
      .review-score-hero {
        flex-direction: column;
        text-align: center;
        gap: 20px;
      }
      .review-score-box {
        text-align: center;
      }
      .footer-bottom {
        flex-direction: column;
        gap: 8px;
        text-align: center;
      }
    }