:root {
      --primary: #4f46e5;
      --primary-hover: #4338ca;
      --secondary: #ec4899;
      --accent: #f59e0b;
      --accent-cyan: #06b6d4;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --bg-base: #fafafa;
      --bg-surface: #ffffff;
      --bg-alt: #f1f5f9;
      --border: #e2e8f0;
      --border-focus: #c7d2fe;
      --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, 0.06);
      --shadow-lg: 0 10px 15px -3px rgba(79, 70, 229, 0.1), 0 4px 6px -4px rgba(79, 70, 229, 0.1);
      --radius: 12px;
      --max-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, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-base);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: all 0.2s ease;
    }

    img {
      display: block;
      max-width: 100%;
      height: auto;
    }

    .container {
      width: 100%;
      max-width: var(--max-width);
      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, 0.96);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border);
    }

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

    .brand-logo {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--primary);
    }

    .brand-logo .ai-page-logo {
      height: 36px;
      width: auto;
    }

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

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

    .nav-links li a {
      display: block;
      padding: 8px 14px;
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--text-muted);
      border-radius: 6px;
    }

    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--primary);
      background-color: #eef2ff;
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 20px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: 8px;
      cursor: pointer;
      border: 1px solid transparent;
      transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }

    .btn-primary {
      background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, #4338ca 0%, #6d28d9 100%);
      box-shadow: 0 6px 16px rgba(79, 70, 229, 0.35);
      transform: translateY(-1px);
      color: #ffffff;
    }

    .btn-secondary {
      background: #ffffff;
      color: var(--primary);
      border-color: #c7d2fe;
    }

    .btn-secondary:hover {
      background: #eef2ff;
      border-color: var(--primary);
    }

    .btn-outline {
      background: #ffffff;
      color: var(--text-main);
      border: 1px solid var(--border);
    }

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

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

    /* 艳彩视觉装饰底色 */
    .section-wrap {
      padding: 80px 0;
      position: relative;
    }

    .section-wrap.alt-bg {
      background-color: var(--bg-alt);
    }

    .section-wrap.bright-bg {
      background: linear-gradient(180deg, #faf5ff 0%, #f0fdfa 100%);
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 50px auto;
    }

    .badge-tag {
      display: inline-block;
      padding: 4px 14px;
      font-size: 0.85rem;
      font-weight: 700;
      border-radius: 999px;
      background: #fdf2f8;
      color: var(--secondary);
      border: 1px solid #fbcfe8;
      margin-bottom: 14px;
      letter-spacing: 0.5px;
    }

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

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

    /* 首屏 Hero */
    .hero-section {
      padding: 80px 0 60px 0;
      background: radial-gradient(100% 100% at 50% 0%, #f5f3ff 0%, #e0f2fe 50%, #fafafa 100%);
      border-bottom: 1px solid var(--border);
    }

    .hero-content {
      text-align: center;
      max-width: 860px;
      margin: 0 auto;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: #eff6ff;
      border: 1px solid #bfdbfe;
      border-radius: 999px;
      font-size: 0.88rem;
      font-weight: 600;
      color: #1d4ed8;
      margin-bottom: 24px;
    }

    .hero-title {
      font-size: 2.75rem;
      font-weight: 900;
      line-height: 1.25;
      color: #0f172a;
      margin-bottom: 20px;
    }

    .hero-title .text-gradient {
      background: linear-gradient(135deg, #4f46e5 0%, #ec4899 50%, #f59e0b 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

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

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

    .btn-hero-primary {
      padding: 14px 32px;
      font-size: 1.1rem;
    }

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 30px;
    }

    .stat-card {
      background: #ffffff;
      padding: 24px 16px;
      border-radius: var(--radius);
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }

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

    .stat-num {
      font-size: 1.85rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }

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

    /* 平台矩阵标签条 */
    .model-tags-bar {
      margin-top: 40px;
      padding: 20px;
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
    }

    .tags-bar-title {
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--text-muted);
      margin-bottom: 12px;
      text-align: center;
    }

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

    .model-tag-item {
      padding: 4px 10px;
      font-size: 0.8rem;
      font-weight: 600;
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: 6px;
      color: #334155;
    }

    /* 网格通用卡片 */
    .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: 28px;
    }

    .feature-card {
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: all 0.25s ease;
    }

    .feature-card:hover {
      border-color: #a5b4fc;
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
    }

    .card-icon-box {
      width: 52px;
      height: 52px;
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 1.25rem;
      margin-bottom: 18px;
      background: #eef2ff;
      color: var(--primary);
    }

    .card-icon-box.pink { background: #fdf2f8; color: var(--secondary); }
    .card-icon-box.amber { background: #fef3c7; color: var(--accent); }
    .card-icon-box.cyan { background: #ecfeff; color: var(--accent-cyan); }

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

    .feature-desc {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
      flex-grow: 1;
    }

    .feature-points {
      list-style: none;
      margin-bottom: 16px;
      font-size: 0.85rem;
      color: var(--text-light);
    }

    .feature-points li {
      margin-bottom: 6px;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .feature-points li::before {
      content: "✓";
      color: var(--primary);
      font-weight: bold;
    }

    /* 图文素材展示区 */
    .media-card-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 24px;
      align-items: center;
    }

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

    .media-box img {
      width: 100%;
      height: auto;
      object-fit: contain;
      background: #f8fafc;
    }

    .media-caption {
      padding: 16px 20px;
      font-weight: 600;
      color: var(--text-main);
      border-top: 1px solid var(--border);
      font-size: 0.95rem;
    }

    /* 评测对比表格 */
    .review-score-banner {
      background: linear-gradient(135deg, #4f46e5 0%, #9333ea 100%);
      color: #ffffff;
      border-radius: var(--radius);
      padding: 32px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 30px;
      box-shadow: var(--shadow-lg);
      flex-wrap: wrap;
      gap: 20px;
    }

    .score-left h3 {
      font-size: 1.6rem;
      margin-bottom: 6px;
    }

    .score-badge {
      display: inline-block;
      background: #fbbf24;
      color: #78350f;
      font-weight: 800;
      padding: 4px 10px;
      border-radius: 4px;
      font-size: 0.85rem;
      margin-left: 8px;
    }

    .score-right {
      display: flex;
      align-items: baseline;
      gap: 8px;
    }

    .score-num {
      font-size: 3.5rem;
      font-weight: 900;
      line-height: 1;
      color: #fde047;
    }

    .score-max {
      font-size: 1.2rem;
      opacity: 0.85;
    }

    .compare-table-container {
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border);
      overflow-x: auto;
      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);
      font-size: 0.95rem;
    }

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

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

    .compare-highlight {
      background: #f5f3ff;
      font-weight: 700;
      color: var(--primary);
    }

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

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

    .step-number {
      font-size: 2rem;
      font-weight: 900;
      color: #cbd5e1;
      line-height: 1;
      margin-bottom: 12px;
    }

    .step-item:hover .step-number {
      color: var(--secondary);
    }

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

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

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

    .comment-text {
      font-size: 0.95rem;
      color: #334155;
      line-height: 1.6;
      margin-bottom: 20px;
      font-style: italic;
    }

    .comment-user {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f1f5f9;
      padding-top: 14px;
    }

    .user-avatar-badge {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: #e0e7ff;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.1rem;
    }

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

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

    /* FAQ 手风琴 */
    .faq-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: 8px;
      overflow: hidden;
    }

    .faq-question {
      padding: 18px 20px;
      font-weight: 700;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #ffffff;
      user-select: none;
      transition: background-color 0.2s ease;
    }

    .faq-question:hover {
      background: #f8fafc;
      color: var(--primary);
    }

    .faq-toggle-icon {
      font-size: 1.2rem;
      font-weight: bold;
      color: var(--text-light);
      transition: transform 0.25s ease;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: #fcfcfd;
      padding: 0 20px;
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    .faq-item.active .faq-answer {
      padding: 16px 20px;
      max-height: 200px;
      border-top: 1px solid var(--border);
    }

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

    /* 表单与联络板块 */
    .contact-layout {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      align-items: start;
    }

    .form-card {
      background: #ffffff;
      padding: 36px;
      border-radius: var(--radius);
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
    }

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

    .form-label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid var(--border);
      border-radius: 6px;
      font-size: 0.95rem;
      color: var(--text-main);
      background-color: #fdfdfd;
      transition: border-color 0.2s ease, box-shadow 0.2s ease;
    }

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

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

    .contact-info-card {
      background: #ffffff;
      padding: 36px;
      border-radius: var(--radius);
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
    }

    .contact-info-list {
      list-style: none;
      margin: 24px 0;
    }

    .contact-info-list li {
      padding: 10px 0;
      display: flex;
      align-items: center;
      gap: 12px;
      border-bottom: 1px dashed var(--border);
      font-size: 0.95rem;
      color: var(--text-muted);
    }

    .contact-info-list strong {
      color: var(--text-main);
    }

    .qr-showcase {
      display: flex;
      align-items: center;
      gap: 20px;
      margin-top: 24px;
      padding: 16px;
      background: #f8fafc;
      border-radius: 8px;
      border: 1px solid var(--border);
    }

    .qr-showcase img {
      width: 100px;
      height: 100px;
      border-radius: 6px;
      border: 1px solid var(--border);
    }

    .qr-text h4 {
      font-size: 1rem;
      margin-bottom: 4px;
    }

    .qr-text p {
      font-size: 0.85rem;
      color: var(--text-light);
    }

    /* 文章与外链条 */
    .article-links-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 20px;
    }

    .article-item-link {
      padding: 8px 16px;
      background: #ffffff;
      border: 1px solid var(--border);
      border-radius: 6px;
      font-size: 0.88rem;
      font-weight: 500;
      color: var(--text-muted);
    }

    .article-item-link:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: #eef2ff;
    }

    /* 友情链接与页脚 */
    .footer-section {
      background-color: #ffffff;
      border-top: 1px solid var(--border);
      padding: 50px 0 30px 0;
      color: var(--text-muted);
    }

    .footer-top {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
      margin-bottom: 40px;
    }

    .footer-brand p {
      margin-top: 12px;
      font-size: 0.9rem;
      line-height: 1.6;
      max-width: 320px;
    }

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

    .footer-links-col ul {
      list-style: none;
    }

    .footer-links-col ul li {
      margin-bottom: 10px;
      font-size: 0.9rem;
    }

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

    .friend-links-box {
      padding: 20px 0;
      border-top: 1px solid var(--border);
      border-bottom: 1px solid var(--border);
      margin-bottom: 24px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 16px;
      font-size: 0.88rem;
    }

    .friend-links-box a {
      color: var(--text-light);
    }

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

    .copyright-text {
      text-align: center;
      font-size: 0.85rem;
      color: var(--text-light);
    }

    /* 悬浮客服 */
    .float-kefu {
      position: fixed;
      right: 20px;
      bottom: 40px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--primary);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 12px rgba(0,0,0,0.15);
      cursor: pointer;
      font-size: 0.85rem;
      font-weight: bold;
      border: none;
      transition: transform 0.2s ease;
    }

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

    .float-btn.back-top {
      background: #ffffff;
      color: var(--text-main);
      border: 1px solid var(--border);
    }

    /* 响应式 */
    @media (max-width: 992px) {
      .grid-4, .timeline-steps, .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-top {
        grid-template-columns: 1fr 1fr;
      }
      .media-card-grid {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        border-bottom: 1px solid var(--border);
        padding: 16px;
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-menu-btn {
        display: block;
      }
      .hero-title {
        font-size: 2rem;
      }
      .section-title {
        font-size: 1.75rem;
      }
      .grid-3, .grid-2, .faq-grid, .contact-layout, .hero-stats-grid, .timeline-steps, .footer-top {
        grid-template-columns: 1fr;
      }
      .review-score-banner {
        text-align: center;
        justify-content: center;
      }
    }