:root {
      --primary: #f59e0b;
      --primary-hover: #d97706;
      --primary-light: #fef3c7;
      --primary-glow: #fbbf24;
      --accent: #111827;
      --accent-soft: #1f2937;
      --text-main: #1e293b;
      --text-muted: #64748b;
      --text-light: #94a3b8;
      --bg-page: #fdfdfc;
      --bg-card: #ffffff;
      --bg-alt: #fffbeb;
      --border: #f1f5f9;
      --border-warm: #fef08a;
      --shadow-sm: 0 2px 8px rgba(245, 158, 11, 0.08);
      --shadow-md: 0 10px 25px -5px rgba(245, 158, 11, 0.12), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
      --shadow-lg: 0 20px 35px -10px rgba(217, 119, 6, 0.15);
      --radius: 12px;
      --container-max: 1200px;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
    }

    body {
      background: radial-gradient(circle at 50% 0%, #fffdf0 0%, #ffffff 70%);
      color: var(--text-main);
      min-height: 100vh;
      overflow-x: hidden;
    }

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

    /* 顶部导航 */
    header.site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 2px solid var(--border-warm);
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
    }

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

    .brand-area img.ai-page-logo {
      height: 42px;
      width: auto;
      object-fit: contain;
      display: block;
    }

    .brand-title {
      font-size: 1.35rem;
      font-weight: 800;
      color: var(--accent);
      letter-spacing: -0.5px;
    }

    .brand-title span {
      color: var(--primary);
    }

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

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

    .nav-links li a {
      text-decoration: none;
      color: var(--text-main);
      font-size: 0.92rem;
      font-weight: 600;
      padding: 8px 12px;
      border-radius: 6px;
      transition: all 0.25s ease;
      display: inline-block;
    }

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

    .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: 700;
      border-radius: 8px;
      text-decoration: none;
      transition: all 0.25s ease;
      cursor: pointer;
      border: 1px solid transparent;
      line-height: 1;
    }

    .btn-primary {
      background: linear-gradient(135deg, #f59e0b 0%, #fbbf24 100%);
      color: #0f172a;
      box-shadow: 0 4px 14px rgba(245, 158, 11, 0.35);
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, #d97706 0%, #f59e0b 100%);
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(245, 158, 11, 0.45);
    }

    .btn-outline {
      background: #ffffff;
      color: var(--accent);
      border-color: #cbd5e1;
    }

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

    .btn-large {
      padding: 14px 32px;
      font-size: 1.05rem;
      border-radius: 10px;
    }

    /* 汉堡菜单按钮 */
    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--accent);
      cursor: pointer;
      padding: 4px;
    }

    /* 区域排版基础 */
    section {
      padding: 80px 0;
      position: relative;
    }

    .section-header {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 50px auto;
    }

    .section-tag {
      display: inline-block;
      padding: 6px 14px;
      background: var(--primary-light);
      color: #b45309;
      font-size: 0.85rem;
      font-weight: 700;
      border-radius: 50px;
      margin-bottom: 14px;
      border: 1px solid var(--border-warm);
    }

    .section-title {
      font-size: 2.25rem;
      font-weight: 800;
      color: var(--accent);
      margin-bottom: 16px;
      line-height: 1.3;
    }

    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 首屏 Hero 无图片区 */
    .hero-section {
      padding: 90px 0 70px 0;
      background: linear-gradient(180deg, #fffbeb 0%, #ffffff 100%);
      border-bottom: 1px solid #fef3c7;
      text-align: center;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #fef3c7;
      border: 1px solid #fde047;
      padding: 6px 16px;
      border-radius: 30px;
      font-size: 0.9rem;
      font-weight: 700;
      color: #92400e;
      margin-bottom: 24px;
    }

    .hero-title {
      font-size: 2.85rem;
      font-weight: 900;
      color: var(--accent);
      line-height: 1.25;
      margin-bottom: 22px;
      max-width: 960px;
      margin-left: auto;
      margin-right: auto;
      letter-spacing: -0.5px;
    }

    .hero-title mark {
      background: linear-gradient(120deg, rgba(251, 191, 36, 0.4) 0%, rgba(245, 158, 11, 0.6) 100%);
      color: inherit;
      padding: 0 8px;
      border-radius: 4px;
    }

    .hero-subtitle {
      font-size: 1.18rem;
      color: var(--text-muted);
      max-width: 780px;
      margin: 0 auto 36px auto;
      line-height: 1.8;
    }

    .hero-ctas {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 18px;
      margin-bottom: 48px;
      flex-wrap: wrap;
    }

    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      max-width: 1040px;
      margin: 0 auto;
      padding-top: 36px;
      border-top: 1px dashed #fcd34d;
    }

    .metric-item {
      background: #ffffff;
      padding: 20px;
      border-radius: var(--radius);
      border: 1px solid #fef08a;
      box-shadow: var(--shadow-sm);
    }

    .metric-value {
      font-size: 2rem;
      font-weight: 900;
      color: var(--primary-hover);
      margin-bottom: 6px;
    }

    .metric-label {
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
    }

    /* 平台介绍 & 核心优势 */
    .intro-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }

    .intro-card {
      background: #ffffff;
      padding: 36px;
      border-radius: var(--radius);
      border: 2px solid #fef08a;
      box-shadow: var(--shadow-md);
    }

    .intro-list {
      list-style: none;
      margin-top: 24px;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .intro-list li {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      font-size: 1rem;
      color: var(--text-main);
    }

    .intro-list li span.dot {
      width: 8px;
      height: 8px;
      background: var(--primary);
      border-radius: 50%;
      margin-top: 8px;
      flex-shrink: 0;
    }

    /* 模型墙与服务矩阵 */
    .models-tags-wrap {
      background: #ffffff;
      padding: 30px;
      border-radius: var(--radius);
      border: 1px solid #fef08a;
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-bottom: 50px;
      box-shadow: var(--shadow-sm);
    }

    .model-tag {
      background: #fffbeb;
      border: 1px solid #fde68a;
      padding: 7px 16px;
      border-radius: 6px;
      font-size: 0.88rem;
      font-weight: 700;
      color: #78350f;
      transition: all 0.2s ease;
    }

    .model-tag:hover {
      background: #f59e0b;
      color: #ffffff;
      transform: translateY(-2px);
    }

    /* 卡片网格 */
    .cards-grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 26px;
    }

    .service-card {
      background: #ffffff;
      border-radius: var(--radius);
      padding: 28px;
      border: 1px solid #f1f5f9;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .service-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
      border-color: #fde047;
    }

    .card-icon {
      width: 48px;
      height: 48px;
      background: var(--primary-light);
      color: #b45309;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 10px;
      font-weight: 900;
      margin-bottom: 20px;
      font-size: 1.25rem;
    }

    .card-title {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--accent);
      margin-bottom: 12px;
    }

    .card-desc {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

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

    .step-box {
      background: #ffffff;
      padding: 28px 20px;
      border-radius: var(--radius);
      border: 1px solid #fef08a;
      text-align: center;
      box-shadow: var(--shadow-sm);
      position: relative;
    }

    .step-number {
      width: 42px;
      height: 42px;
      line-height: 42px;
      background: #f59e0b;
      color: #ffffff;
      font-weight: 900;
      border-radius: 50%;
      margin: 0 auto 16px auto;
      font-size: 1.1rem;
    }

    .step-name {
      font-size: 1.15rem;
      font-weight: 800;
      color: var(--accent);
      margin-bottom: 10px;
    }

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

    /* 评测与对比表格 */
    .review-summary-banner {
      background: linear-gradient(135deg, #fffbeb 0%, #fef3c7 100%);
      border: 2px solid #fcd34d;
      border-radius: var(--radius);
      padding: 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 40px;
      flex-wrap: wrap;
      gap: 20px;
    }

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

    .score-num {
      font-size: 3.5rem;
      font-weight: 900;
      color: #b45309;
      line-height: 1;
    }

    .score-stars {
      color: #f59e0b;
      font-size: 1.4rem;
      margin-bottom: 4px;
    }

    .table-container {
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid #e2e8f0;
      box-shadow: var(--shadow-sm);
    }

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

    table.data-table th, table.data-table td {
      padding: 16px 20px;
      border-bottom: 1px solid #f1f5f9;
      font-size: 0.95rem;
    }

    table.data-table th {
      background: #fffbeb;
      color: var(--accent);
      font-weight: 800;
      white-space: nowrap;
    }

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

    table.data-table td.highlight {
      background: #fefce8;
      font-weight: 700;
      color: #b45309;
    }

    /* 案例展示 */
    .case-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
    }

    .case-card {
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid #fef08a;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .case-media {
      width: 100%;
      height: 260px;
      overflow: hidden;
      background: #f8fafc;
    }

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

    .case-card:hover .case-media img {
      transform: scale(1.04);
    }

    .case-content {
      padding: 24px;
    }

    .case-tag {
      font-size: 0.8rem;
      font-weight: 700;
      color: #b45309;
      background: #fef3c7;
      padding: 4px 10px;
      border-radius: 4px;
      display: inline-block;
      margin-bottom: 10px;
    }

    .case-title {
      font-size: 1.25rem;
      font-weight: 800;
      margin-bottom: 8px;
    }

    .case-desc {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

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

    .review-card {
      background: #ffffff;
      padding: 26px;
      border-radius: var(--radius);
      border: 1px solid #fef08a;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .reviewer-header {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }

    .reviewer-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #fef3c7;
      color: #b45309;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
    }

    .reviewer-info h4 {
      font-size: 1rem;
      font-weight: 800;
      color: var(--accent);
    }

    .reviewer-info p {
      font-size: 0.82rem;
      color: var(--text-muted);
    }

    .review-text {
      font-size: 0.92rem;
      color: var(--text-main);
      line-height: 1.7;
    }

    /* FAQ 手风琴 */
    .faq-container {
      max-width: 920px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid #e2e8f0;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      padding: 18px 24px;
      font-weight: 700;
      font-size: 1.05rem;
      color: var(--accent);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #ffffff;
      user-select: none;
      transition: background 0.2s ease;
    }

    .faq-question:hover {
      background: #fffbeb;
    }

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

    .faq-answer {
      padding: 0 24px;
      max-height: 0;
      overflow: hidden;
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.7;
      transition: max-height 0.3s ease, padding 0.3s ease;
    }

    .faq-item.active .faq-answer {
      padding: 16px 24px 20px 24px;
      max-height: 220px;
      border-top: 1px solid #fef3c7;
    }

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

    /* 文章推荐板块 */
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 30px;
    }

    .article-card {
      background: #ffffff;
      padding: 22px;
      border-radius: var(--radius);
      border: 1px solid #f1f5f9;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
    }

    .article-card:hover {
      border-color: #fde047;
      transform: translateY(-3px);
    }

    .article-title {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 10px;
      line-height: 1.4;
    }

    .article-title a {
      color: var(--accent);
      text-decoration: none;
    }

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

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

    /* 表单与联系模块 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 40px;
      background: #ffffff;
      border-radius: var(--radius);
      border: 2px solid #fef08a;
      box-shadow: var(--shadow-md);
      overflow: hidden;
    }

    .contact-info {
      background: #fffbeb;
      padding: 40px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .info-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 16px;
      margin: 24px 0;
    }

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

    .qr-box {
      text-align: center;
      background: #ffffff;
      padding: 20px;
      border-radius: 8px;
      border: 1px dashed #fcd34d;
      max-width: 200px;
    }

    .qr-box img {
      max-width: 140px;
      height: auto;
      margin: 0 auto 8px auto;
      display: block;
      border-radius: 4px;
    }

    .contact-form-area {
      padding: 40px;
    }

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

    .form-label {
      display: block;
      font-weight: 700;
      font-size: 0.92rem;
      margin-bottom: 8px;
      color: var(--accent);
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid #cbd5e1;
      border-radius: 8px;
      font-size: 0.95rem;
      color: var(--text-main);
      outline: none;
      transition: border-color 0.2s ease;
      font-family: inherit;
    }

    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.15);
    }

    /* 友情链接与页脚 */
    .links-bar {
      background: #f8fafc;
      padding: 30px 0;
      border-top: 1px solid #e2e8f0;
      border-bottom: 1px solid #e2e8f0;
    }

    .links-title {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-muted);
      margin-bottom: 12px;
    }

    .links-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }

    .links-wrap a {
      color: #475569;
      text-decoration: none;
      font-size: 0.9rem;
      transition: color 0.2s ease;
    }

    .links-wrap a:hover {
      color: var(--primary-hover);
      text-decoration: underline;
    }

    footer.site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 48px 0 32px 0;
      font-size: 0.9rem;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 36px;
    }

    .footer-brand h3 {
      color: #f8fafc;
      font-size: 1.3rem;
      margin-bottom: 12px;
      font-weight: 800;
    }

    .footer-brand p {
      line-height: 1.7;
      max-width: 440px;
    }

    .footer-col h4 {
      color: #f8fafc;
      font-size: 1rem;
      margin-bottom: 16px;
      font-weight: 700;
    }

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

    .footer-col a {
      color: #94a3b8;
      text-decoration: none;
      transition: color 0.2s;
    }

    .footer-col a:hover {
      color: #fbbf24;
    }

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      text-align: center;
      font-size: 0.85rem;
      color: #64748b;
    }

    /* 浮动客服 */
    .floating-widget {
      position: fixed;
      right: 20px;
      bottom: 40px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .widget-btn {
      width: 52px;
      height: 52px;
      background: #f59e0b;
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 15px rgba(245, 158, 11, 0.4);
      cursor: pointer;
      text-decoration: none;
      transition: all 0.3s ease;
      font-weight: 800;
      font-size: 1.1rem;
      border: none;
    }

    .widget-btn:hover {
      transform: scale(1.08);
      background: #d97706;
    }

    /* 响应式断点适配 */
    @media (max-width: 1024px) {
      .cards-grid-3, .reviews-grid, .articles-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .process-steps {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-metrics {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .mobile-menu-toggle {
        display: block;
      }
      nav.nav-bar {
        position: absolute;
        top: 76px;
        left: 0;
        width: 100%;
        background: #ffffff;
        border-bottom: 2px solid var(--border-warm);
        padding: 20px 24px;
        display: none;
        flex-direction: column;
        align-items: flex-start;
        box-shadow: var(--shadow-md);
      }
      nav.nav-bar.active {
        display: flex;
      }
      .nav-links {
        flex-direction: column;
        width: 100%;
        align-items: flex-start;
      }
      .nav-links li {
        width: 100%;
      }
      .nav-links li a {
        display: block;
        padding: 10px 0;
        border-bottom: 1px solid #f1f5f9;
      }
      .hero-title {
        font-size: 2.1rem;
      }
      .intro-grid, .case-grid, .contact-wrapper, .footer-grid {
        grid-template-columns: 1fr;
      }
      .cards-grid-3, .reviews-grid, .articles-grid {
        grid-template-columns: 1fr;
      }
      .process-steps {
        grid-template-columns: 1fr;
      }
      .hero-metrics {
        grid-template-columns: 1fr;
      }
      .contact-info {
        padding: 24px;
      }
      .contact-form-area {
        padding: 24px;
      }
      .review-summary-banner {
        flex-direction: column;
        align-items: flex-start;
      }
    }