:root {
      --primary: #4f46e5;
      --primary-gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #ec4899 100%);
      --iridescent: linear-gradient(135deg, #e0e7ff 0%, #fce7f3 35%, #e0f2fe 70%, #f3e8ff 100%);
      --iridescent-border: linear-gradient(135deg, rgba(99, 102, 241, 0.4), rgba(236, 72, 153, 0.4), rgba(14, 165, 233, 0.4));
      --bg-light: #f8fafc;
      --card-bg: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --border-color: #e2e8f0;
      --shadow-sm: 0 2px 8px rgba(99, 102, 241, 0.05);
      --shadow-md: 0 10px 25px -5px rgba(99, 102, 241, 0.08), 0 8px 10px -6px rgba(236, 72, 153, 0.05);
      --shadow-lg: 0 20px 30px -10px rgba(99, 102, 241, 0.12), 0 10px 15px -5px rgba(236, 72, 153, 0.08);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --container-width: 1200px;
    }

    * {
      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, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-light);
      background-image: 
        radial-gradient(at 0% 0%, rgba(99, 102, 241, 0.06) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(236, 72, 153, 0.06) 0px, transparent 50%),
        radial-gradient(at 50% 50%, rgba(14, 165, 233, 0.04) 0px, transparent 50%);
      background-attachment: fixed;
      color: var(--text-main);
      line-height: 1.65;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      width: 100%;
      max-width: var(--container-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.88);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(226, 232, 240, 0.8);
      transition: all 0.3s ease;
    }

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

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

    .ai-page-logo {
      height: 40px;
      width: auto;
      display: block;
    }

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

    .nav-links a {
      color: var(--text-muted);
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      padding: 8px 14px;
      border-radius: var(--radius-sm);
      transition: color 0.2s ease, background-color 0.2s ease;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
      background: rgba(99, 102, 241, 0.08);
    }

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

    .btn-laser {
      background: var(--primary-gradient);
      color: #ffffff;
      padding: 10px 22px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: var(--radius-md);
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      box-shadow: 0 4px 14px rgba(99, 102, 241, 0.3);
      transition: transform 0.2s ease, box-shadow 0.2s ease;
      border: none;
      cursor: pointer;
    }

    .btn-laser:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(236, 72, 153, 0.4);
    }

    .btn-outline {
      background: #ffffff;
      color: var(--text-main);
      border: 1px solid var(--border-color);
      padding: 10px 20px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: var(--radius-md);
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      transition: all 0.2s ease;
      cursor: pointer;
    }

    .btn-outline:hover {
      border-color: #a855f7;
      color: var(--primary);
      background: #faf5ff;
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }

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

    .section-head {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 52px;
    }

    .section-tag {
      display: inline-block;
      padding: 4px 14px;
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--primary);
      background: rgba(99, 102, 241, 0.1);
      border-radius: 999px;
      margin-bottom: 12px;
      border: 1px solid rgba(99, 102, 241, 0.2);
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.02em;
      margin-bottom: 16px;
    }

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

    /* 首屏 Hero (无图片，纯CSS科技感) */
    .hero-section {
      padding: 80px 0 60px;
      text-align: center;
      position: relative;
      overflow: hidden;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: linear-gradient(90deg, rgba(238, 242, 255, 0.9), rgba(253, 242, 248, 0.9));
      border: 1px solid rgba(168, 85, 247, 0.25);
      border-radius: 999px;
      font-size: 0.9rem;
      font-weight: 600;
      color: #6366f1;
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
    }

    .hero-badge span {
      display: inline-block;
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: #10b981;
      animation: pulse 2s infinite;
    }

    @keyframes pulse {
      0%, 100% { opacity: 1; transform: scale(1); }
      50% { opacity: 0.4; transform: scale(0.85); }
    }

    .hero-title {
      font-size: 3rem;
      font-weight: 900;
      line-height: 1.25;
      margin-bottom: 24px;
      color: var(--text-main);
      letter-spacing: -0.03em;
    }

    .hero-title .gradient-text {
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      display: inline-block;
    }

    .hero-desc {
      font-size: 1.2rem;
      color: var(--text-muted);
      max-width: 820px;
      margin: 0 auto 36px;
      line-height: 1.7;
    }

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

    .hero-btn-main {
      font-size: 1.1rem;
      padding: 14px 34px;
      border-radius: var(--radius-md);
    }

    .model-tags-container {
      background: rgba(255, 255, 255, 0.7);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 24px;
      max-width: 980px;
      margin: 0 auto;
      box-shadow: var(--shadow-md);
      position: relative;
    }

    .model-tags-title {
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--text-light);
      margin-bottom: 14px;
      text-transform: uppercase;
      letter-spacing: 0.05em;
    }

    .model-tags-grid {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
    }

    .model-tag {
      padding: 6px 14px;
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: 20px;
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--text-muted);
      transition: all 0.2s ease;
      box-shadow: 0 1px 3px rgba(0,0,0,0.02);
    }

    .model-tag:hover {
      border-color: #a855f7;
      color: var(--primary);
      transform: translateY(-2px);
      box-shadow: 0 4px 10px rgba(168, 85, 247, 0.15);
    }

    /* 指标卡片 */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: -20px;
      margin-bottom: 40px;
    }

    .metric-card {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      text-align: center;
      box-shadow: var(--shadow-sm);
      transition: transform 0.2s ease;
    }

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

    .metric-num {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }

    .metric-label {
      font-size: 0.95rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 卡片网格与组件 */
    .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;
    }

    .laser-card {
      background: #ffffff;
      border-radius: var(--radius-lg);
      padding: 28px;
      border: 1px solid var(--border-color);
      position: relative;
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }

    .laser-card:hover {
      transform: translateY(-6px);
      border-color: rgba(168, 85, 247, 0.4);
      box-shadow: var(--shadow-lg);
    }

    .card-icon-wrap {
      width: 48px;
      height: 48px;
      border-radius: var(--radius-md);
      background: var(--iridescent);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--primary);
    }

    .card-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .card-text {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 18px;
      flex-grow: 1;
    }

    .card-footer-tag {
      font-size: 0.8rem;
      color: var(--primary);
      font-weight: 600;
      background: #f5f3ff;
      padding: 4px 10px;
      border-radius: 6px;
      align-self: flex-start;
    }

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

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

    .step-num {
      width: 36px;
      height: 36px;
      background: var(--primary-gradient);
      color: #ffffff;
      font-weight: 800;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 16px;
      font-size: 1rem;
    }

    /* 对比评测 */
    .eval-box {
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-md);
    }

    .eval-header {
      background: var(--iridescent);
      padding: 32px;
      text-align: center;
      border-bottom: 1px solid var(--border-color);
    }

    .eval-score-wrap {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 16px;
      margin-top: 12px;
    }

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

    .eval-stars {
      color: #f59e0b;
      font-size: 1.4rem;
      text-align: left;
    }

    .eval-table-container {
      overflow-x: auto;
      padding: 12px;
    }

    .custom-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }

    .custom-table th,
    .custom-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.95rem;
    }

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

    .custom-table td.highlight {
      background: #faf5ff;
      color: var(--primary);
      font-weight: 600;
    }

    /* 案例展示 */
    .media-showcase-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 24px;
      align-items: center;
    }

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

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

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

    .media-info {
      padding: 20px;
    }

    /* FAQ 折叠面板 */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

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

    .faq-item.active {
      border-color: rgba(168, 85, 247, 0.5);
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      padding: 20px 24px;
      font-weight: 700;
      font-size: 1.05rem;
      color: var(--text-main);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      user-select: none;
    }

    .faq-toggle-icon {
      font-size: 1.2rem;
      color: var(--primary);
      transition: transform 0.3s 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;
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.7;
      padding: 0 24px;
    }

    .faq-item.active .faq-answer {
      padding: 0 24px 20px;
      max-height: 300px;
    }

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

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

    .review-text {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 20px;
      position: relative;
    }

    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f1f5f9;
      padding-top: 16px;
    }

    .author-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: var(--primary-gradient);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1rem;
    }

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

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

    /* 文章列表 */
    .articles-box {
      background: #ffffff;
      border-radius: var(--radius-lg);
      padding: 32px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

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

    .article-pill {
      display: inline-flex;
      align-items: center;
      padding: 8px 16px;
      background: #f8fafc;
      border: 1px solid var(--border-color);
      border-radius: 20px;
      color: var(--text-muted);
      text-decoration: none;
      font-size: 0.9rem;
      transition: all 0.2s ease;
    }

    .article-pill:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: #f5f3ff;
    }

    /* 表单与转化板块 */
    .contact-form-wrap {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      background: #ffffff;
      border-radius: var(--radius-lg);
      padding: 40px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
    }

    .form-group {
      margin-bottom: 20px;
    }

    .form-label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .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-main);
      outline: none;
      transition: border-color 0.2s ease;
      background: #fcfdfe;
    }

    .form-input:focus,
    .form-select:focus,
    .form-textarea:focus {
      border-color: var(--primary);
      background: #ffffff;
    }

    .contact-info-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
      margin-top: 24px;
    }

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

    .qr-wrapper {
      margin-top: 24px;
      text-align: center;
      display: inline-block;
      padding: 12px;
      background: #f8fafc;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
    }

    .qr-wrapper img {
      max-width: 140px;
      height: auto;
      display: block;
      border-radius: 4px;
    }

    /* 友情链接与页脚 */
    .site-footer {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 48px 0 28px;
      color: var(--text-muted);
      font-size: 0.9rem;
    }

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

    .footer-brand p {
      margin-top: 12px;
      font-size: 0.9rem;
      color: var(--text-light);
      max-width: 320px;
    }

    .footer-col h4 {
      font-size: 1rem;
      color: var(--text-main);
      margin-bottom: 16px;
      font-weight: 700;
    }

    .footer-links-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }

    .footer-links-grid a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 0.85rem;
      transition: color 0.2s ease;
    }

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

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

    /* 浮动客服 */
    .float-kefu-btn {
      position: fixed;
      right: 24px;
      bottom: 24px;
      z-index: 999;
      background: var(--primary-gradient);
      color: #ffffff;
      width: 54px;
      height: 54px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 8px 24px rgba(99, 102, 241, 0.35);
      cursor: pointer;
      text-decoration: none;
      transition: transform 0.2s ease;
    }

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

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

    @media (max-width: 768px) {
      .hero-title {
        font-size: 2.2rem;
      }
      .cards-grid-3, .reviews-grid, .contact-form-wrap, .footer-top {
        grid-template-columns: 1fr;
      }
      .cards-grid-4, .steps-timeline, .metrics-grid {
        grid-template-columns: 1fr;
      }
      .nav-links {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      .nav-links.mobile-active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .section-title {
        font-size: 1.75rem;
      }
    }