:root {
      --primary: #4338ca;
      --primary-light: #6366f1;
      --primary-gradient: linear-gradient(135deg, #4f46e5 0%, #7c3aed 50%, #ec4899 100%);
      --laser-gradient: linear-gradient(135deg, rgba(238, 242, 255, 0.9) 0%, rgba(250, 232, 255, 0.9) 50%, rgba(224, 242, 254, 0.9) 100%);
      --laser-border: linear-gradient(135deg, #818cf8, #c084fc, #f472b6, #38bdf8);
      --text-main: #1e293b;
      --text-muted: #64748b;
      --text-heading: #0f172a;
      --bg-base: #f8fafc;
      --card-bg: rgba(255, 255, 255, 0.95);
      --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.04);
      --shadow-md: 0 8px 24px -4px rgba(99, 102, 241, 0.08), 0 4px 12px -2px rgba(0, 0, 0, 0.04);
      --shadow-lg: 0 16px 32px -8px rgba(99, 102, 241, 0.12), 0 8px 16px -4px rgba(0, 0, 0, 0.04);
      --border-color: #e2e8f0;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --radius-full: 9999px;
      --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: var(--bg-base);
      background-image: 
        radial-gradient(at 0% 0%, rgba(99, 102, 241, 0.08) 0px, transparent 50%),
        radial-gradient(at 100% 0%, rgba(236, 72, 153, 0.08) 0px, transparent 50%),
        radial-gradient(at 50% 50%, rgba(56, 189, 248, 0.05) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(124, 58, 237, 0.08) 0px, transparent 50%);
      background-attachment: fixed;
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

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

    ul, ol {
      list-style: none;
    }

    .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: 100;
      background: rgba(255, 255, 255, 0.88);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(226, 232, 240, 0.8);
      transition: box-shadow 0.3s ease;
    }
    
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

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

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

    .brand-name {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-heading);
      letter-spacing: -0.02em;
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

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

    .nav-links a {
      font-size: 0.935rem;
      font-weight: 500;
      color: var(--text-muted);
      padding: 8px 12px;
      border-radius: var(--radius-sm);
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
      background: rgba(99, 102, 241, 0.06);
    }

    .nav-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: var(--radius-full);
      cursor: pointer;
      transition: all 0.25s ease;
      border: 1px solid transparent;
      text-align: center;
    }

    .btn-laser {
      background: var(--primary-gradient);
      color: #ffffff !important;
      box-shadow: 0 4px 14px rgba(99, 102, 241, 0.35);
      border: none;
    }

    .btn-laser:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(99, 102, 241, 0.5);
    }

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

    .btn-outline:hover {
      border-color: var(--primary-light);
      color: var(--primary);
      background: rgba(99, 102, 241, 0.04);
    }

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

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

    /* 通用Section结构 */
    .section {
      padding: 80px 0;
      position: relative;
    }

    .section-header {
      text-align: center;
      max-width: 720px;
      margin: 0 auto 54px;
    }

    .section-tag {
      display: inline-block;
      padding: 4px 14px;
      font-size: 0.8rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.08em;
      color: var(--primary);
      background: rgba(99, 102, 241, 0.1);
      border: 1px solid rgba(99, 102, 241, 0.2);
      border-radius: var(--radius-full);
      margin-bottom: 14px;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--text-heading);
      line-height: 1.3;
      margin-bottom: 14px;
      letter-spacing: -0.02em;
    }

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

    /* Hero 首屏 (严格无图片) */
    .hero-section {
      padding: 90px 0 70px;
      text-align: center;
      position: relative;
      overflow: hidden;
    }

    .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 #e0e7ff;
      box-shadow: var(--shadow-sm);
      border-radius: var(--radius-full);
      font-size: 0.875rem;
      color: var(--primary);
      font-weight: 600;
      margin-bottom: 24px;
    }

    .hero-badge-dot {
      width: 8px;
      height: 8px;
      background: #10b981;
      border-radius: 50%;
      box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
    }

    .hero-title {
      font-size: 3rem;
      font-weight: 800;
      color: var(--text-heading);
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.03em;
    }

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

    .hero-subtitle {
      font-size: 1.2rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 36px;
      max-width: 760px;
      margin-left: auto;
      margin-right: auto;
    }

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

    .hero-actions .btn-laser {
      padding: 14px 36px;
      font-size: 1.05rem;
    }

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

    .hero-stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 18px;
      margin-top: 20px;
    }

    .stat-card {
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 22px 16px;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      position: relative;
    }

    .stat-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 3px;
      background: var(--laser-border);
      border-radius: var(--radius-md) var(--radius-md) 0 0;
      opacity: 0;
      transition: opacity 0.25s ease;
    }

    .stat-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
    }

    .stat-card:hover::before {
      opacity: 1;
    }

    .stat-value {
      font-size: 2rem;
      font-weight: 800;
      color: var(--text-heading);
      line-height: 1.2;
      margin-bottom: 4px;
    }

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

    /* 品牌模型展示云 */
    .model-pills-container {
      margin-top: 36px;
      padding: 18px;
      background: rgba(255, 255, 255, 0.7);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
    }

    .model-pills-title {
      font-size: 0.85rem;
      color: var(--text-muted);
      margin-bottom: 12px;
      font-weight: 600;
    }

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

    .model-pill {
      font-size: 0.8rem;
      padding: 4px 12px;
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: var(--radius-full);
      color: var(--text-main);
      font-weight: 500;
      box-shadow: 0 1px 2px rgba(0,0,0,0.02);
      transition: all 0.2s ease;
    }

    .model-pill:hover {
      border-color: var(--primary-light);
      color: var(--primary);
      transform: translateY(-1px);
    }

    /* 激光渐变卡片组件 */
    .laser-card {
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      position: relative;
      overflow: hidden;
    }

    .laser-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: #cbd5e1;
    }

    .laser-card::after {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 4px;
      background: var(--laser-border);
      opacity: 0.85;
    }

    /* 网格系统 */
    .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: 32px;
    }

    /* 服务能力模块 */
    .service-icon {
      width: 48px;
      height: 48px;
      background: var(--laser-gradient);
      border: 1px solid #e0e7ff;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 18px;
      color: var(--primary);
    }

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

    .service-desc {
      font-size: 0.925rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    .service-badge {
      display: inline-block;
      font-size: 0.75rem;
      font-weight: 600;
      padding: 2px 8px;
      background: #eff6ff;
      color: #3b82f6;
      border-radius: var(--radius-full);
      margin-top: 14px;
    }

    /* 对比评测模块 */
    .rating-header-box {
      background: var(--laser-gradient);
      border: 1px solid #c7d2fe;
      border-radius: var(--radius-lg);
      padding: 32px;
      text-align: center;
      margin-bottom: 36px;
      box-shadow: var(--shadow-sm);
    }

    .rating-score-huge {
      font-size: 3.5rem;
      font-weight: 900;
      color: var(--primary);
      line-height: 1;
      margin-bottom: 8px;
    }

    .rating-stars {
      color: #f59e0b;
      font-size: 1.5rem;
      letter-spacing: 4px;
      margin-bottom: 8px;
    }

    .table-container {
      overflow-x: auto;
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      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: #f8fafc;
      font-weight: 700;
      color: var(--text-heading);
    }

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

    .compare-table td.highlight {
      background: rgba(99, 102, 241, 0.04);
      font-weight: 600;
      color: var(--primary);
    }

    .badge-check {
      color: #10b981;
      font-weight: bold;
    }

    .badge-cross {
      color: #94a3b8;
    }

    /* 流程步骤 */
    .step-item {
      position: relative;
      text-align: center;
      padding: 24px 16px;
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
    }

    .step-num {
      width: 42px;
      height: 42px;
      margin: 0 auto 16px;
      background: var(--primary-gradient);
      color: #ffffff;
      font-weight: 800;
      font-size: 1.1rem;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 10px rgba(99, 102, 241, 0.3);
    }

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

    .step-desc {
      font-size: 0.875rem;
      color: var(--text-muted);
    }

    /* 案例中心 */
    .case-gallery {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

    .case-card {
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .case-img-wrap {
      width: 100%;
      aspect-ratio: 16 / 9;
      background: #f1f5f9;
      overflow: hidden;
      display: flex;
      align-items: center;
      justify-content: center;
    }

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

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

    .case-body {
      padding: 20px;
    }

    .case-tag {
      font-size: 0.75rem;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 6px;
      display: inline-block;
    }

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

    .case-desc {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 宣传图画廊 */
    .banner-gallery {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 32px;
    }

    .banner-item {
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      aspect-ratio: 4 / 3;
      background: #f8fafc;
    }

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

    /* 用户评论卡片 */
    .review-card {
      background: var(--card-bg);
      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-text {
      font-size: 0.925rem;
      color: var(--text-main);
      line-height: 1.6;
      margin-bottom: 18px;
      font-style: italic;
    }

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

    .review-avatar {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--laser-gradient);
      border: 1px solid #c7d2fe;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--primary);
    }

    .review-meta-name {
      font-weight: 700;
      color: var(--text-heading);
      font-size: 0.9rem;
    }

    .review-meta-role {
      font-size: 0.75rem;
      color: var(--text-muted);
    }

    /* 表单组件 */
    .form-wrap {
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-md);
    }

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

    .form-label {
      display: block;
      font-size: 0.875rem;
      font-weight: 600;
      color: var(--text-heading);
      margin-bottom: 8px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      font-size: 0.95rem;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      background: #ffffff;
      color: var(--text-main);
      outline: none;
      transition: border-color 0.2s ease, box-shadow 0.2s ease;
    }

    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
    }

    textarea.form-control {
      min-height: 110px;
      resize: vertical;
    }

    /* FAQ 手风琴 */
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
    }

    .faq-item {
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      margin-bottom: 12px;
      overflow: hidden;
      transition: border-color 0.2s ease;
    }

    .faq-item:hover {
      border-color: #cbd5e1;
    }

    .faq-question {
      padding: 18px 24px;
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-heading);
      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-answer {
      padding: 0 24px 20px;
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.6;
      display: none;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

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

    /* 文章列表 & 百科 */
    .article-list {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
    }

    .article-card {
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 18px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      box-shadow: var(--shadow-sm);
    }

    .article-card:hover {
      border-color: var(--primary-light);
      background: #ffffff;
    }

    .article-title {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-heading);
    }

    .article-link-btn {
      font-size: 0.85rem;
      color: var(--primary);
      font-weight: 600;
      white-space: nowrap;
    }

    /* 浮动客服 */
    .floating-contact {
      position: fixed;
      right: 24px;
      bottom: 30px;
      z-index: 99;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .float-btn {
      width: 52px;
      height: 52px;
      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);
      font-size: 1.25rem;
      position: relative;
      transition: all 0.25s ease;
    }

    .float-btn:hover {
      transform: scale(1.08);
      box-shadow: var(--shadow-lg);
    }

    .qr-popover {
      position: absolute;
      right: 64px;
      bottom: 0;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 12px;
      box-shadow: var(--shadow-lg);
      width: 150px;
      display: none;
      text-align: center;
    }

    .qr-popover img {
      width: 100%;
      height: auto;
      border-radius: 4px;
      display: block;
      margin-bottom: 6px;
    }

    .qr-popover p {
      font-size: 0.75rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    .float-btn:hover .qr-popover {
      display: block;
    }

    /* 页脚 */
    .site-footer {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 60px 0 30px;
      color: var(--text-muted);
    }

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

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

    .footer-links li {
      margin-bottom: 10px;
    }

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

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

    .friend-links-box {
      border-top: 1px solid var(--border-color);
      padding: 24px 0;
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      align-items: center;
    }

    .friend-links-title {
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--text-heading);
    }

    .friend-links-box a {
      font-size: 0.85rem;
      color: var(--text-muted);
    }

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

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

    /* 响应式适配 */
    @media (max-width: 992px) {
      .hero-title {
        font-size: 2.3rem;
      }
      .grid-4, .hero-stats {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .banner-gallery {
        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 24px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .menu-toggle {
        display: block;
      }
      .hero-title {
        font-size: 1.85rem;
      }
      .grid-3, .grid-2, .case-gallery, .article-list {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
      }
    }