:root {
      --primary: #4F46E5;
      --primary-hover: #4338CA;
      --secondary: #F43F5E;
      --accent-cyan: #06B6D4;
      --accent-amber: #F59E0B;
      --accent-green: #10B981;
      --dark-text: #0F172A;
      --body-text: #334155;
      --muted-text: #64748B;
      --bg-page: #F8FAFC;
      --bg-surface: #FFFFFF;
      --bg-subtle: #F1F5F9;
      --border-color: #E2E8F0;
      --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
      --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
      --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.03);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 20px;
    }

    * {
      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, "Noto Sans", sans-serif;
      background-color: var(--bg-page);
      color: var(--body-text);
      line-height: 1.6;
      overflow-x: hidden;
      display: flex;
      flex-direction: column;
      align-items: center;
      width: 100%;
    }

    /* 容器规范：确保全站统一居中与宽度体系 */
    .container {
      width: 100%;
      max-width: 1200px;
      padding: 0 24px;
      margin: 0 auto;
    }

    /* Header & Navigation */
    header {
      width: 100%;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
      position: sticky;
      top: 0;
      z-index: 1000;
    }

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

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

    .logo-box img.ai-page-logo {
      height: 40px;
      width: auto;
      object-fit: contain;
    }

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

    .nav-links a {
      color: var(--body-text);
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      transition: all 0.2s ease;
      display: inline-block;
    }

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

    .header-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 20px;
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      font-weight: 600;
      text-decoration: none;
      transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
      cursor: pointer;
      border: 1px solid transparent;
      white-space: nowrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, #6366F1 100%);
      color: #FFFFFF;
      box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, var(--primary-hover) 0%, #4F46E5 100%);
      transform: translateY(-2px);
      box-shadow: 0 6px 16px rgba(79, 70, 229, 0.4);
      color: #FFFFFF;
    }

    .btn-secondary {
      background: #FFFFFF;
      color: var(--dark-text);
      border-color: var(--border-color);
    }

    .btn-secondary:hover {
      background: var(--bg-subtle);
      border-color: #CBD5E1;
      transform: translateY(-2px);
    }

    .btn-accent {
      background: linear-gradient(135deg, var(--secondary) 0%, #E11D48 100%);
      color: #FFFFFF;
      box-shadow: 0 4px 12px rgba(244, 63, 94, 0.3);
    }

    .btn-accent:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 16px rgba(244, 63, 94, 0.4);
      color: #FFFFFF;
    }

    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--dark-text);
      cursor: pointer;
      padding: 4px;
    }

    /* Main Container Structure */
    main {
      width: 100%;
      display: flex;
      flex-direction: column;
      align-items: center;
    }

    section {
      width: 100%;
      padding: 64px 0;
      display: flex;
      flex-direction: column;
      align-items: center;
    }

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

    .section-tag {
      display: inline-block;
      padding: 4px 12px;
      background: rgba(79, 70, 229, 0.1);
      color: var(--primary);
      border-radius: 9999px;
      font-size: 0.85rem;
      font-weight: 700;
      margin-bottom: 12px;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--dark-text);
      line-height: 1.3;
      margin-bottom: 16px;
    }

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

    /* 首屏 Hero 区域：无任何图片，纯 CSS 科技几何与明艳色彩 */
    .hero-section {
      background: radial-gradient(circle at 10% 20%, rgba(6, 182, 212, 0.12) 0%, transparent 40%),
                  radial-gradient(circle at 90% 10%, rgba(244, 63, 94, 0.12) 0%, transparent 40%),
                  radial-gradient(circle at 50% 90%, rgba(79, 70, 229, 0.08) 0%, transparent 50%),
                  #FFFFFF;
      padding: 80px 0 60px 0;
      border-bottom: 1px solid var(--border-color);
      position: relative;
    }

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

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: #EEF2FF;
      border: 1px solid #C7D2FE;
      color: var(--primary);
      border-radius: 9999px;
      font-size: 0.9rem;
      font-weight: 600;
      margin-bottom: 24px;
    }

    .hero-title {
      font-size: 2.8rem;
      font-weight: 900;
      color: var(--dark-text);
      line-height: 1.25;
      margin-bottom: 24px;
      letter-spacing: -0.5px;
    }

    .hero-highlight {
      background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 1.2rem;
      color: var(--body-text);
      max-width: 720px;
      margin: 0 auto 36px auto;
      line-height: 1.7;
    }

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

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

    /* 纯 CSS 视觉数据看板 (替代图片) */
    .hero-dashboard-mock {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 24px;
      box-shadow: 0 20px 40px -15px rgba(15, 23, 42, 0.08);
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      max-width: 1000px;
      margin: 0 auto;
    }

    .dash-stat-item {
      padding: 16px;
      background: var(--bg-page);
      border-radius: var(--radius-md);
      text-align: left;
      border-left: 4px solid var(--primary);
      transition: transform 0.2s;
    }

    .dash-stat-item:hover {
      transform: translateY(-2px);
    }

    .dash-stat-item:nth-child(2) { border-left-color: var(--secondary); }
    .dash-stat-item:nth-child(3) { border-left-color: var(--accent-cyan); }
    .dash-stat-item:nth-child(4) { border-left-color: var(--accent-green); }

    .dash-label {
      font-size: 0.85rem;
      color: var(--muted-text);
      margin-bottom: 6px;
      font-weight: 500;
    }

    .dash-val {
      font-size: 1.5rem;
      font-weight: 800;
      color: var(--dark-text);
    }

    /* 平台模型支持流动标签 */
    .model-strip {
      padding: 24px 0;
      background: #FFFFFF;
      border-bottom: 1px solid var(--border-color);
      width: 100%;
    }

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

    .model-tag {
      background: var(--bg-subtle);
      border: 1px solid var(--border-color);
      padding: 6px 14px;
      border-radius: 9999px;
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--dark-text);
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: all 0.2s;
    }

    .model-tag:hover {
      background: #FFFFFF;
      border-color: var(--primary);
      color: var(--primary);
      transform: translateY(-1px);
    }

    /* 卡片网格通用 */
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

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

    .feature-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
    }

    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: #CBD5E1;
    }

    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: var(--radius-sm);
      background: #EEF2FF;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      font-size: 1.3rem;
      font-weight: bold;
    }

    .feature-card h3 {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--dark-text);
      margin-bottom: 12px;
    }

    .feature-card p {
      font-size: 0.95rem;
      color: var(--body-text);
      line-height: 1.6;
    }

    /* 图文案例展示 */
    .media-card {
      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;
    }

    .media-card-img-wrap {
      width: 100%;
      aspect-ratio: 16 / 9;
      background: var(--bg-subtle);
      overflow: hidden;
      display: flex;
      align-items: center;
      justify-content: center;
    }

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

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

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

    .media-card-body {
      padding: 20px;
      flex: 1;
      display: flex;
      flex-direction: column;
    }

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

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

    /* 对比评测表格 */
    .compare-section {
      background: #FFFFFF;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }

    .rating-banner {
      background: linear-gradient(135deg, #1E1B4B 0%, #312E81 100%);
      color: #FFFFFF;
      border-radius: var(--radius-md);
      padding: 24px 32px;
      margin-bottom: 32px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
    }

    .rating-info h4 {
      font-size: 1.3rem;
      font-weight: 700;
      margin-bottom: 6px;
    }

    .rating-score {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .score-number {
      font-size: 2.8rem;
      font-weight: 900;
      color: #FBBF24;
      line-height: 1;
    }

    .score-badge {
      font-size: 1rem;
      color: #E2E8F0;
      background: rgba(255, 255, 255, 0.15);
      padding: 6px 14px;
      border-radius: 9999px;
      font-weight: 600;
    }

    .table-responsive {
      width: 100%;
      overflow-x: auto;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.95rem;
      background: #FFFFFF;
    }

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

    .compare-table th {
      background: var(--bg-subtle);
      font-weight: 700;
      color: var(--dark-text);
    }

    .compare-table tr:hover td {
      background: #F8FAFC;
    }

    .highlight-cell {
      color: var(--primary);
      font-weight: 700;
      background: #EEF2FF !important;
    }

    /* 流程步骤 */
    .step-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      position: relative;
    }

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

    .step-num {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--primary);
      color: #FFFFFF;
      font-weight: 800;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px auto;
      box-shadow: 0 4px 10px rgba(79, 70, 229, 0.3);
    }

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

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

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

    .testimonial-text {
      font-size: 0.95rem;
      color: var(--body-text);
      margin-bottom: 20px;
      line-height: 1.6;
    }

    .testimonial-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid var(--border-color);
      padding-top: 16px;
    }

    .author-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, #6366F1, #F43F5E);
      color: #FFFFFF;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1rem;
    }

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

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

    /* FAQ 折叠面板 */
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
      width: 100%;
    }

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

    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      font-size: 1.05rem;
      color: var(--dark-text);
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      user-select: none;
    }

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

    .faq-icon {
      font-size: 1.2rem;
      transition: transform 0.3s ease;
      color: var(--primary);
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #FFFFFF;
    }

    .faq-answer-inner {
      padding: 0 24px 20px 24px;
      color: var(--body-text);
      font-size: 0.95rem;
      line-height: 1.6;
    }

    /* 表单与需求匹配 */
    .form-box {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-md);
      max-width: 800px;
      margin: 0 auto;
      width: 100%;
    }

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

    .form-group label {
      display: block;
      margin-bottom: 8px;
      font-weight: 600;
      color: var(--dark-text);
      font-size: 0.95rem;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 1rem;
      color: var(--dark-text);
      background: #FFFFFF;
      transition: border-color 0.2s, box-shadow 0.2s;
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
    }

    textarea.form-control {
      min-height: 120px;
      resize: vertical;
    }

    /* 资讯列表 */
    .article-links-wrap {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
    }

    .article-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .article-item {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 12px 0;
      border-bottom: 1px dashed var(--border-color);
    }

    .article-item:last-child {
      border-bottom: none;
    }

    .article-item a {
      color: var(--dark-text);
      text-decoration: none;
      font-weight: 500;
      transition: color 0.2s;
    }

    .article-item a:hover {
      color: var(--primary);
    }

    /* 页脚设计：同容器对齐，配色明确 */
    footer {
      width: 100%;
      background: #0F172A;
      color: #94A3B8;
      border-top: 1px solid #1E293B;
      padding: 60px 0 24px 0;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 48px;
    }

    .footer-brand h3 {
      color: #FFFFFF;
      font-size: 1.3rem;
      margin-bottom: 16px;
    }

    .footer-brand p {
      font-size: 0.9rem;
      line-height: 1.6;
      margin-bottom: 20px;
    }

    .footer-col h4 {
      color: #FFFFFF;
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 16px;
    }

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

    .footer-links a {
      color: #94A3B8;
      text-decoration: none;
      font-size: 0.9rem;
      transition: color 0.2s;
    }

    .footer-links a:hover {
      color: #FFFFFF;
    }

    .qrcode-box {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .qrcode-box img {
      width: 88px;
      height: 88px;
      border-radius: var(--radius-sm);
      background: #FFFFFF;
      padding: 4px;
    }

    .qrcode-desc {
      font-size: 0.85rem;
      line-height: 1.5;
    }

    .friend-links-box {
      border-top: 1px solid #1E293B;
      padding-top: 24px;
      margin-bottom: 24px;
    }

    .friend-links-box span {
      color: #E2E8F0;
      font-weight: 600;
      font-size: 0.9rem;
      margin-right: 12px;
    }

    .friend-links-box a {
      color: #94A3B8;
      text-decoration: none;
      font-size: 0.85rem;
      margin-right: 16px;
      display: inline-block;
      margin-bottom: 8px;
      transition: color 0.2s;
    }

    .friend-links-box a:hover {
      color: #38BDF8;
    }

    .footer-bottom {
      border-top: 1px solid #1E293B;
      padding-top: 24px;
      text-align: center;
      font-size: 0.85rem;
      color: #64748B;
    }

    /* 浮动组件与返回顶部 */
    .floating-tools {
      position: fixed;
      right: 24px;
      bottom: 30px;
      display: flex;
      flex-direction: column;
      gap: 12px;
      z-index: 999;
    }

    .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;
      color: var(--dark-text);
      text-decoration: none;
      font-size: 1.1rem;
      cursor: pointer;
      transition: all 0.2s;
    }

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

    /* 响应式断点控制 */
    @media (max-width: 992px) {
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .hero-dashboard-mock { grid-template-columns: repeat(2, 1fr); }
      .step-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
    }

    @media (max-width: 768px) {
      .mobile-toggle { display: block; }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #FFFFFF;
        flex-direction: column;
        align-items: stretch;
        padding: 16px 24px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-lg);
      }
      .nav-links.active { display: flex; }
      .nav-links a { padding: 12px 16px; border-radius: var(--radius-sm); }
      .hero-title { font-size: 2.1rem; }
      .section-title { font-size: 1.8rem; }
      .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
      .hero-dashboard-mock { grid-template-columns: 1fr; }
      .step-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .rating-banner { flex-direction: column; align-items: flex-start; }
      .header-actions .btn-secondary { display: none; }
    }