:root {
      --primary: #4f46e5;
      --primary-hover: #4338ca;
      --secondary: #06b6d4;
      --accent: #f97316;
      --accent-grad: linear-gradient(135deg, #ff6b6b 0%, #ff8e53 50%, #f97316 100%);
      --brand-grad: linear-gradient(135deg, #4f46e5 0%, #06b6d4 100%);
      --bg-light: #f8fafc;
      --bg-card: #ffffff;
      --bg-soft: #f1f5f9;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --border-color: #e2e8f0;
      --border-focus: #cbd5e1;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 18px;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
      --shadow-md: 0 6px 16px -2px rgba(15, 23, 42, 0.08);
      --shadow-lg: 0 14px 28px -4px rgba(15, 23, 42, 0.12);
      --transition: all 0.28s ease;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-tap-highlight-color: transparent;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.65;
      overflow-x: hidden;
    }

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

    ul, ol {
      list-style: none;
    }

    .container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 20px;
    }

    .section {
      padding: 70px 0;
      position: relative;
    }

    .section-title-wrap {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 44px;
    }

    .section-tag {
      display: inline-block;
      padding: 4px 14px;
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--primary);
      background: #eef2ff;
      border: 1px solid #c7d2fe;
      border-radius: 999px;
      margin-bottom: 12px;
      letter-spacing: 0.5px;
    }

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

    .section-subtitle {
      font-size: 1rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 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-color);
      box-shadow: 0 2px 10px rgba(0,0,0,0.03);
    }

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

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

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

    .nav-brand-title {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--text-main);
      display: inline-block;
    }

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

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

    .nav-links a:hover {
      color: var(--primary);
      background: #f1f5f9;
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.94rem;
      font-weight: 600;
      border-radius: var(--radius-sm);
      cursor: pointer;
      transition: var(--transition);
      border: 1px solid transparent;
      text-align: center;
    }

    .btn-primary {
      background: var(--brand-grad);
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
    }

    .btn-primary:hover {
      opacity: 0.95;
      transform: translateY(-1px);
      box-shadow: 0 6px 18px rgba(79, 70, 229, 0.35);
      color: #fff;
    }

    .btn-accent {
      background: var(--accent-grad);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(249, 115, 22, 0.28);
    }

    .btn-accent:hover {
      opacity: 0.95;
      transform: translateY(-1px);
      box-shadow: 0 8px 20px rgba(249, 115, 22, 0.38);
      color: #fff;
    }

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

    .btn-outline:hover {
      background: #f8fafc;
      border-color: var(--primary);
      color: var(--primary);
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
      padding: 6px;
    }

    /* 首屏 Hero：严禁使用任何图片，纯高颜值科技渐变与卡片布局 */
    .hero-section {
      background: linear-gradient(180deg, #eff6ff 0%, #f8fafc 100%);
      padding: 70px 0 80px;
      position: relative;
      overflow: hidden;
    }

    .hero-decor-circle {
      position: absolute;
      width: 500px;
      height: 500px;
      border-radius: 50%;
      background: radial-gradient(circle, rgba(79, 70, 229, 0.08) 0%, rgba(6, 182, 212, 0.02) 70%, transparent 100%);
      top: -150px;
      right: -100px;
      pointer-events: none;
      z-index: 0;
    }

    .hero-decor-circle-2 {
      position: absolute;
      width: 400px;
      height: 400px;
      border-radius: 50%;
      background: radial-gradient(circle, rgba(249, 115, 22, 0.06) 0%, rgba(255, 107, 107, 0.01) 70%, transparent 100%);
      bottom: -100px;
      left: -80px;
      pointer-events: none;
      z-index: 0;
    }

    .hero-content {
      position: relative;
      z-index: 1;
      text-align: center;
      max-width: 920px;
      margin: 0 auto;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: #ffffff;
      border: 1px solid #e0e7ff;
      border-radius: 999px;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--primary);
      box-shadow: var(--shadow-sm);
      margin-bottom: 24px;
    }

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

    .hero-title {
      font-size: 2.8rem;
      font-weight: 900;
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -1px;
      color: #0f172a;
    }

    .hero-title-highlight {
      background: linear-gradient(120deg, #4f46e5 0%, #06b6d4 50%, #f97316 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 34px;
      max-width: 800px;
      margin-left: auto;
      margin-right: auto;
    }

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

    .btn-hero-large {
      padding: 14px 34px;
      font-size: 1.05rem;
      border-radius: var(--radius-md);
    }

    .hero-grid-stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 10px;
    }

    .hero-stat-card {
      background: #ffffff;
      border: 1px solid rgba(226, 232, 240, 0.8);
      border-radius: var(--radius-md);
      padding: 22px 18px;
      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: #cbd5e1;
    }

    .hero-stat-number {
      font-size: 1.85rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.1;
      margin-bottom: 6px;
    }

    .hero-stat-desc {
      font-size: 0.88rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 平台矩阵标签条 */
    .model-scroll-section {
      background: #ffffff;
      padding: 24px 0;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }

    .model-tag-list {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 8px 12px;
    }

    .model-chip {
      background: var(--bg-soft);
      border: 1px solid #e2e8f0;
      color: var(--text-muted);
      padding: 4px 12px;
      font-size: 0.82rem;
      font-weight: 500;
      border-radius: 6px;
      transition: var(--transition);
    }

    .model-chip:hover {
      background: #eef2ff;
      border-color: #c7d2fe;
      color: var(--primary);
    }

    /* 卡片网格通用 */
    .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: 30px;
      align-items: center;
    }

    .card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      position: relative;
    }

    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: #c7d2fe;
    }

    .card-icon-box {
      width: 50px;
      height: 50px;
      border-radius: var(--radius-sm);
      background: #eef2ff;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      margin-bottom: 18px;
      border: 1px solid #e0e7ff;
    }

    .card-title {
      font-size: 1.2rem;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-main);
    }

    .card-text {
      font-size: 0.93rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 一站式制作场景特色卡片 */
    .feature-item-pill {
      display: inline-block;
      font-size: 0.76rem;
      font-weight: 600;
      padding: 2px 8px;
      background: #f1f5f9;
      color: var(--text-light);
      border-radius: 4px;
      margin-top: 14px;
    }

    /* 流程步骤 */
    .step-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 20px;
      position: relative;
      box-shadow: var(--shadow-sm);
    }

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

    /* 评测与对比表格 */
    .comparison-section {
      background: #ffffff;
    }

    .score-banner {
      background: linear-gradient(135deg, #4f46e5 0%, #1e1b4b 100%);
      color: #ffffff;
      border-radius: var(--radius-lg);
      padding: 36px;
      margin-bottom: 34px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 24px;
      box-shadow: var(--shadow-md);
    }

    .score-left h3 {
      font-size: 1.6rem;
      font-weight: 800;
      margin-bottom: 8px;
      color: #ffffff;
    }

    .score-left p {
      color: #cbd5e1;
      font-size: 0.96rem;
      max-width: 580px;
    }

    .score-badge-box {
      text-align: right;
      background: rgba(255, 255, 255, 0.1);
      padding: 16px 28px;
      border-radius: var(--radius-md);
      border: 1px solid rgba(255, 255, 255, 0.18);
    }

    .score-number {
      font-size: 2.6rem;
      font-weight: 900;
      color: #38bdf8;
      line-height: 1;
    }

    .score-star {
      color: #fbbf24;
      font-size: 1.2rem;
      letter-spacing: 2px;
      margin-top: 4px;
    }

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

    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 680px;
      background: #ffffff;
    }

    .comparison-table th, .comparison-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.94rem;
    }

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

    .comparison-table td:first-child {
      font-weight: 600;
      color: var(--text-main);
      background: #fbfcfe;
    }

    .table-highlight {
      background: #f0fdf4 !important;
      color: #15803d;
      font-weight: 700;
    }

    /* 需求匹配与表单 */
    .form-wrapper-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 38px;
      box-shadow: var(--shadow-md);
    }

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

    .form-label {
      display: block;
      font-size: 0.92rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .form-input, .form-select, .form-textarea {
      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);
      transition: var(--transition);
      outline: none;
    }

    .form-input:focus, .form-select:focus, .form-textarea:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.12);
    }

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

    /* 用户评论 */
    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 18px;
      padding-top: 16px;
      border-top: 1px solid #f1f5f9;
    }

    .review-avatar-char {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: var(--brand-grad);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.1rem;
    }

    .review-meta h4 {
      font-size: 0.96rem;
      font-weight: 700;
      color: var(--text-main);
    }

    .review-meta p {
      font-size: 0.82rem;
      color: var(--text-light);
    }

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

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      margin-bottom: 14px;
      overflow: hidden;
      transition: var(--transition);
    }

    .faq-question {
      padding: 18px 22px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 700;
      color: var(--text-main);
      background: #ffffff;
      transition: var(--transition);
      font-size: 1rem;
    }

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

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

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: #f8fafc;
      color: var(--text-muted);
      font-size: 0.94rem;
      line-height: 1.7;
      padding: 0 22px;
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 18px 22px;
      border-top: 1px solid #e2e8f0;
    }

    /* 案例中心媒体容器 */
    .media-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .media-card-thumb {
      width: 100%;
      aspect-ratio: 16 / 9;
      background: #e2e8f0;
      overflow: hidden;
    }

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

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

    .media-card-body {
      padding: 20px;
    }

    /* 资讯与友情链接 */
    .news-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .news-item-link {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 14px 18px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.93rem;
      font-weight: 500;
      color: var(--text-main);
    }

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

    /* 页脚 */
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px;
      border-top: 1px solid #1e293b;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 36px;
      margin-bottom: 44px;
    }

    .footer-col h4 {
      color: #ffffff;
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 18px;
    }

    .footer-col p, .footer-col li {
      font-size: 0.88rem;
      line-height: 1.8;
      color: #94a3b8;
    }

    .footer-col a {
      color: #cbd5e1;
    }

    .footer-col a:hover {
      color: #38bdf8;
    }

    .footer-qrcode-box {
      display: flex;
      align-items: center;
      gap: 16px;
      margin-top: 14px;
    }

    .footer-qrcode-box img {
      width: 90px;
      height: 90px;
      border-radius: 6px;
      background: #fff;
      padding: 4px;
    }

    .footer-links-inline {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 10px;
    }

    .footer-links-inline a {
      color: #94a3b8;
      font-size: 0.86rem;
      background: #1e293b;
      padding: 4px 10px;
      border-radius: 4px;
    }

    .footer-links-inline a:hover {
      color: #38bdf8;
      background: #334155;
    }

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 0.84rem;
      color: #64748b;
    }

    /* 悬浮客服小部件 */
    .floating-contact-box {
      position: fixed;
      right: 24px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--brand-grad);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 6px 18px rgba(79, 70, 229, 0.4);
      cursor: pointer;
      font-size: 1.2rem;
      border: none;
      transition: var(--transition);
    }

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

    /* 响应式断点适配 */
    @media (max-width: 992px) {
      .grid-4, .hero-grid-stats, .step-timeline {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-2 {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .hero-title {
        font-size: 2.2rem;
      }
    }

    @media (max-width: 768px) {
      .section {
        padding: 48px 0;
      }
      .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        border-bottom: 1px solid var(--border-color);
        padding: 16px 20px;
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links a {
        padding: 12px 0;
        width: 100%;
        border-bottom: 1px solid #f1f5f9;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .grid-4, .grid-3, .hero-grid-stats, .step-timeline, .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero-title {
        font-size: 1.85rem;
      }
      .score-banner {
        flex-direction: column;
        text-align: center;
      }
      .score-badge-box {
        text-align: center;
        width: 100%;
      }
      .footer-bottom {
        flex-direction: column;
        text-align: center;
      }
    }