/* 全局变量与撞色艳色风规范 */
    :root {
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --brand-primary: #ff0055;
      --brand-secondary: #00e5ff;
      --brand-accent: #7928ca;
      --brand-yellow: #ffe600;
      --brand-dark: #090d16;
      --border-color: #e2e8f0;
      --border-pop: #0f172a;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --shadow-pop: 4px 4px 0px #0f172a;
      --shadow-pop-lg: 8px 8px 0px #0f172a;
      --transition: all 0.25s cubic-bezier(0.25, 0.8, 0.25, 1);
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
      background-color: var(--bg-main);
      color: var(--text-main);
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
      line-height: 1.6;
    }

    body {
      background-color: var(--bg-main);
      color: var(--text-main);
      overflow-x: hidden;
    }

    /* 居中通用容器 */
    .container {
      width: 100%;
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

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

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

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

    .brand-logo-box {
      max-width: 140px;
      display: flex;
      align-items: center;
    }

    .brand-logo-box img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    .ai-page-home-link {
      font-weight: 700;
      color: var(--text-main);
      text-decoration: none;
      padding: 6px 12px;
      background: var(--brand-yellow);
      border: 2px solid var(--border-pop);
      border-radius: var(--radius-sm);
      box-shadow: 2px 2px 0 var(--border-pop);
      transition: var(--transition);
    }
    .ai-page-home-link:hover {
      transform: translate(-1px, -1px);
      box-shadow: 3px 3px 0 var(--border-pop);
    }

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

    .nav-links li a {
      color: var(--text-main);
      text-decoration: none;
      font-weight: 600;
      font-size: 0.95rem;
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      transition: var(--transition);
    }

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

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

    .btn-pop {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      text-decoration: none;
      padding: 10px 20px;
      border-radius: var(--radius-sm);
      border: 2px solid var(--border-pop);
      box-shadow: var(--shadow-pop);
      cursor: pointer;
      transition: var(--transition);
      font-size: 0.95rem;
    }

    .btn-pop:hover {
      transform: translate(-2px, -2px);
      box-shadow: 6px 6px 0px var(--border-pop);
    }

    .btn-primary {
      background-color: var(--brand-primary);
      color: #ffffff;
    }

    .btn-cyan {
      background-color: var(--brand-secondary);
      color: var(--text-main);
    }

    .btn-yellow {
      background-color: var(--brand-yellow);
      color: var(--text-main);
    }

    .mobile-menu-btn {
      display: none;
      background: transparent;
      border: 2px solid var(--border-pop);
      padding: 6px 10px;
      border-radius: var(--radius-sm);
      font-weight: 700;
      cursor: pointer;
    }

    /* 区域通用样式 */
    .section-padding {
      padding: 80px 0;
    }

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

    .section-badge {
      display: inline-block;
      padding: 4px 14px;
      background: var(--brand-secondary);
      border: 2px solid var(--border-pop);
      box-shadow: 2px 2px 0 var(--border-pop);
      font-weight: 800;
      font-size: 0.85rem;
      text-transform: uppercase;
      margin-bottom: 14px;
      border-radius: 20px;
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 900;
      color: var(--text-main);
      margin-bottom: 12px;
      line-height: 1.3;
    }

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

    /* 首屏 HERO 区域（严格无图片） */
    .hero-section {
      padding: 90px 0 80px;
      background: linear-gradient(135deg, #fffdf7 0%, #e0f7fa 50%, #fce4ec 100%);
      border-bottom: 2px solid var(--border-pop);
      position: relative;
    }

    .hero-content {
      text-align: center;
      max-width: 960px;
      margin: 0 auto;
    }

    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #ffffff;
      border: 2px solid var(--border-pop);
      box-shadow: var(--shadow-pop);
      padding: 6px 16px;
      border-radius: 30px;
      font-weight: 700;
      font-size: 0.9rem;
      margin-bottom: 24px;
    }

    .hero-tag span {
      display: inline-block;
      width: 10px;
      height: 10px;
      background: var(--brand-primary);
      border-radius: 50%;
    }

    .hero-title {
      font-size: 2.8rem;
      font-weight: 900;
      line-height: 1.2;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
      color: var(--text-main);
    }

    .hero-title .highlight {
      background: linear-gradient(180deg, transparent 65%, var(--brand-yellow) 65%);
      display: inline;
      padding: 0 4px;
    }

    .hero-subtitle {
      font-size: 1.2rem;
      color: var(--text-muted);
      margin-bottom: 36px;
      max-width: 780px;
      margin-left: auto;
      margin-right: auto;
      line-height: 1.7;
    }

    .hero-btns {
      display: flex;
      justify-content: center;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 50px;
    }

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

    .stat-card {
      background: #ffffff;
      border: 2px solid var(--border-pop);
      border-radius: var(--radius-md);
      padding: 20px 16px;
      box-shadow: var(--shadow-pop);
      text-align: center;
      transition: var(--transition);
    }

    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-pop-lg);
    }

    .stat-num {
      font-size: 2rem;
      font-weight: 900;
      color: var(--brand-primary);
      display: block;
      margin-bottom: 4px;
    }

    .stat-label {
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--text-muted);
    }

    /* 平台介绍与模型聚合 */
    .models-tags-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 24px;
    }

    .model-tag-item {
      background: #ffffff;
      border: 2px solid var(--border-pop);
      padding: 6px 14px;
      border-radius: var(--radius-sm);
      font-weight: 700;
      font-size: 0.85rem;
      box-shadow: 2px 2px 0 var(--border-pop);
      transition: var(--transition);
    }

    .model-tag-item:hover {
      background: var(--brand-secondary);
      transform: scale(1.05);
    }

    /* 卡片网格体系 */
    .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;
    }

    .pop-card {
      background: var(--bg-card);
      border: 2px solid var(--border-pop);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-pop);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: var(--transition);
    }

    .pop-card:hover {
      transform: translate(-3px, -3px);
      box-shadow: var(--shadow-pop-lg);
    }

    .card-icon-title {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }

    .card-badge-icon {
      width: 42px;
      height: 42px;
      background: var(--brand-yellow);
      border: 2px solid var(--border-pop);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      font-size: 1.2rem;
      flex-shrink: 0;
    }

    .card-title {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--text-main);
    }

    .card-text {
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.6;
      margin-bottom: 16px;
    }

    .card-footer-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
    }

    .mini-tag {
      font-size: 0.75rem;
      background: #f1f5f9;
      border: 1px solid var(--border-pop);
      padding: 2px 8px;
      border-radius: 4px;
      font-weight: 600;
    }

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

    .step-box {
      background: #ffffff;
      border: 2px solid var(--border-pop);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-pop);
      position: relative;
    }

    .step-index {
      position: absolute;
      top: -14px;
      right: 14px;
      background: var(--brand-primary);
      color: #fff;
      font-weight: 900;
      font-size: 0.85rem;
      padding: 2px 10px;
      border: 2px solid var(--border-pop);
      border-radius: 20px;
    }

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

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

    /* 对比评测专属样式 */
    .eval-highlight-box {
      background: linear-gradient(135deg, #fff9db 0%, #e3fafc 100%);
      border: 3px solid var(--border-pop);
      border-radius: var(--radius-lg);
      padding: 30px;
      box-shadow: var(--shadow-pop-lg);
      margin-bottom: 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
    }

    .eval-score-num {
      font-size: 3.5rem;
      font-weight: 900;
      color: var(--brand-primary);
      line-height: 1;
    }

    .eval-stars {
      color: #f59e0b;
      font-size: 1.4rem;
      letter-spacing: 2px;
    }

    .table-container {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border: 2px solid var(--border-pop);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-pop);
    }

    .pop-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.95rem;
    }

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

    .pop-table th {
      background-color: #f1f5f9;
      font-weight: 800;
      color: var(--text-main);
      border-bottom: 2px solid var(--border-pop);
    }

    .pop-table tr:hover {
      background-color: #f8fafc;
    }

    .pop-table td.highlight-col {
      background-color: #fff9db;
      font-weight: 700;
      color: var(--brand-primary);
    }

    /* 案例中心媒体图展示 */
    .case-media-box {
      border: 2px solid var(--border-pop);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-pop);
      background: #ffffff;
      margin-bottom: 24px;
    }

    .banner-row {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 12px;
      margin-bottom: 20px;
    }

    .banner-item, .img-box {
      border: 2px solid var(--border-pop);
      border-radius: var(--radius-sm);
      overflow: hidden;
      background: #e2e8f0;
    }

    .banner-item img, .img-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: transform 0.3s ease;
    }

    .banner-item:hover img, .img-box:hover img {
      transform: scale(1.04);
    }

    .mat-row {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 20px;
    }

    /* 用户评论 */
    .review-user-info {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }

    .user-avatar-tag {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--brand-secondary);
      border: 2px solid var(--border-pop);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      font-size: 1.1rem;
    }

    .user-meta-name {
      font-weight: 800;
      font-size: 1rem;
    }

    .user-meta-role {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* FAQ 折叠面板 */
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 14px;
      max-width: 900px;
      margin: 0 auto;
    }

    .faq-item {
      background: #ffffff;
      border: 2px solid var(--border-pop);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-pop);
      overflow: hidden;
    }

    .faq-question {
      padding: 18px 24px;
      font-weight: 800;
      font-size: 1.05rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #ffffff;
      transition: var(--transition);
    }

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

    .faq-icon {
      font-weight: 900;
      font-size: 1.2rem;
      transition: transform 0.25s ease;
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #fcfcfc;
      border-top: 1px solid transparent;
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
      border-top: 1px solid var(--border-color);
      padding: 18px 24px;
    }

    .faq-answer p {
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.7;
    }

    /* 需求表单与联系我们 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 30px;
    }

    .form-box {
      background: #ffffff;
      border: 2px solid var(--border-pop);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-pop-lg);
    }

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

    .form-label {
      display: block;
      font-weight: 800;
      font-size: 0.95rem;
      margin-bottom: 8px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 2px solid var(--border-pop);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      outline: none;
      transition: var(--transition);
      background: #f8fafc;
      font-family: inherit;
    }

    .form-control:focus {
      background: #ffffff;
      box-shadow: 2px 2px 0 var(--border-pop);
    }

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

    .contact-card-box {
      background: #ffffff;
      border: 2px solid var(--border-pop);
      border-radius: var(--radius-lg);
      padding: 30px;
      box-shadow: var(--shadow-pop);
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    .contact-item-row {
      display: flex;
      align-items: flex-start;
      gap: 14px;
    }

    .contact-ico {
      width: 36px;
      height: 36px;
      border: 2px solid var(--border-pop);
      border-radius: var(--radius-sm);
      background: var(--brand-secondary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      flex-shrink: 0;
    }

    .qr-container {
      text-align: center;
      padding: 16px;
      border: 2px dashed var(--border-pop);
      border-radius: var(--radius-md);
      background: #fdfdfd;
    }

    .qr-container img {
      max-width: 160px;
      height: auto;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
      display: inline-block;
    }

    /* 资讯与友情链接 */
    .article-link-list {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 14px;
    }

    .article-btn-link {
      display: inline-block;
      padding: 8px 16px;
      background: #ffffff;
      border: 2px solid var(--border-pop);
      border-radius: var(--radius-sm);
      color: var(--text-main);
      text-decoration: none;
      font-size: 0.9rem;
      font-weight: 700;
      box-shadow: 2px 2px 0 var(--border-pop);
      transition: var(--transition);
    }

    .article-btn-link:hover {
      background: var(--brand-yellow);
      transform: translate(-1px, -1px);
    }

    .friend-links-box {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 10px;
    }

    .friend-links-box a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 0.85rem;
      background: #f1f5f9;
      padding: 4px 10px;
      border-radius: 4px;
      border: 1px solid var(--border-color);
      transition: var(--transition);
    }

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

    /* 页脚统一规范 */
    .site-footer {
      background-color: #ffffff;
      border-top: 2px solid var(--border-pop);
      padding: 50px 0 30px;
      color: var(--text-main);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 30px;
      margin-bottom: 40px;
    }

    .footer-col-title {
      font-weight: 900;
      font-size: 1.1rem;
      margin-bottom: 16px;
      color: var(--text-main);
    }

    .footer-nav-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .footer-nav-list a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 0.9rem;
      transition: var(--transition);
    }

    .footer-nav-list a:hover {
      color: var(--brand-primary);
      padding-left: 4px;
    }

    .footer-bottom-bar {
      border-top: 1px solid var(--border-color);
      padding-top: 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 14px;
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    /* 悬浮组件 */
    .floating-tools {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      background: #ffffff;
      border: 2px solid var(--border-pop);
      border-radius: 50%;
      box-shadow: var(--shadow-pop);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      font-size: 1rem;
      cursor: pointer;
      text-decoration: none;
      color: var(--text-main);
      transition: var(--transition);
    }

    .float-btn:hover {
      transform: translate(-2px, -2px);
      box-shadow: 4px 4px 0 var(--border-pop);
      background: var(--brand-yellow);
    }

    /* 响应式调整 */
    @media (max-width: 1024px) {
      .hero-stats-grid, .steps-container, .banner-row {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3, .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .mobile-menu-btn {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        border-bottom: 2px solid var(--border-pop);
        flex-direction: column;
        padding: 20px;
        gap: 10px;
      }
      .nav-links.show {
        display: flex;
      }
      .hero-title {
        font-size: 2rem;
      }
      .hero-stats-grid, .grid-2, .grid-3, .grid-4, .steps-container, .banner-row, .mat-row, .contact-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .eval-highlight-box {
        flex-direction: column;
        text-align: center;
      }
    }