/* 全局变量与多彩涂鸦风格基调 */
    :root {
      --bg-main: #fcfbfa;
      --bg-card: #ffffff;
      --bg-alt: #f6f4ee;
      --text-main: #1e242d;
      --text-muted: #57606a;
      --border-dark: #1e242d;
      --color-yellow: #ffd53d;
      --color-coral: #ff6b6b;
      --color-cyan: #4ecdc4;
      --color-purple: #9d4edd;
      --color-blue: #3a86ff;
      --color-green: #2ec4b6;
      --shadow-doodle: 4px 4px 0px var(--border-dark);
      --shadow-doodle-lg: 6px 6px 0px var(--border-dark);
      --shadow-doodle-hover: 2px 2px 0px var(--border-dark);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --radius-pill: 999px;
      --container-max: 1200px;
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.65;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
      background-image: radial-gradient(#e5e0d8 1px, transparent 1px);
      background-size: 24px 24px;
    }

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

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

    /* 容器规范贯穿全页 */
    .container {
      max-width: var(--container-max);
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
      width: 100%;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(252, 251, 250, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 2px solid var(--border-dark);
    }

    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 74px;
    }

    .brand-logo-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
      font-weight: 900;
      font-size: 1.25rem;
    }

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

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

    .nav-links a {
      padding: 8px 12px;
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-main);
      border-radius: var(--radius-sm);
    }

    .nav-links a:hover {
      background-color: var(--color-yellow);
      color: var(--border-dark);
    }

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

    .mobile-menu-btn {
      display: none;
      background: var(--color-yellow);
      border: 2px solid var(--border-dark);
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      font-weight: 800;
      cursor: pointer;
      box-shadow: 2px 2px 0 var(--border-dark);
    }

    /* 基础按钮与涂鸦徽章 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.95rem;
      font-weight: 800;
      border-radius: var(--radius-pill);
      border: 2px solid var(--border-dark);
      box-shadow: var(--shadow-doodle);
      cursor: pointer;
      transition: transform 0.15s ease, box-shadow 0.15s ease, background-color 0.2s ease;
      text-align: center;
    }

    .btn:hover {
      transform: translate(2px, 2px);
      box-shadow: var(--shadow-doodle-hover);
    }

    .btn-primary {
      background-color: var(--color-yellow);
      color: var(--border-dark);
    }

    .btn-primary:hover {
      background-color: #ffca1a;
    }

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

    .btn-coral:hover {
      background-color: #ff5252;
    }

    .btn-cyan {
      background-color: var(--color-cyan);
      color: var(--border-dark);
    }

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

    .btn-dark {
      background-color: var(--border-dark);
      color: #ffffff;
    }

    .btn-dark:hover {
      background-color: #333d4b;
    }

    .badge-tag {
      display: inline-block;
      padding: 4px 12px;
      font-size: 0.8rem;
      font-weight: 800;
      border-radius: var(--radius-pill);
      border: 2px solid var(--border-dark);
      margin-bottom: 12px;
      box-shadow: 2px 2px 0 var(--border-dark);
    }

    /* 通用Section */
    .section-wrap {
      padding: 70px 0;
      position: relative;
    }

    .section-header {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 48px;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 900;
      color: var(--text-main);
      margin-bottom: 14px;
      position: relative;
      display: inline-block;
    }

    .section-title::after {
      content: "";
      position: absolute;
      left: 10%;
      right: 10%;
      bottom: -6px;
      height: 6px;
      background: var(--color-yellow);
      border-radius: 4px;
      z-index: -1;
      transform: rotate(-1deg);
    }

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

    /* 首屏 Hero - 无图片，纯CSS与涂鸦卡片排版 */
    .hero-section {
      padding: 60px 0 50px;
      background: linear-gradient(180deg, #fff9e6 0%, #fcfbfa 100%);
      border-bottom: 2px solid var(--border-dark);
      position: relative;
    }

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

    .hero-h1 {
      font-size: 2.4rem;
      font-weight: 900;
      line-height: 1.3;
      margin: 16px 0 20px;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }

    .hero-h1 span {
      background: linear-gradient(120deg, var(--color-yellow) 0%, #ffe600 100%);
      padding: 2px 10px;
      border-radius: 8px;
      border: 2px solid var(--border-dark);
      display: inline-block;
      transform: rotate(0.5deg);
    }

    .hero-lead {
      font-size: 1.15rem;
      color: var(--text-muted);
      margin-bottom: 30px;
      max-width: 820px;
      margin-left: auto;
      margin-right: auto;
    }

    .hero-cta-group {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 16px;
      margin-bottom: 40px;
    }

    .hero-features-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 30px;
    }

    .hero-feature-card {
      background: var(--bg-card);
      border: 2px solid var(--border-dark);
      border-radius: var(--radius-md);
      padding: 18px 14px;
      box-shadow: var(--shadow-doodle);
      text-align: left;
      transition: transform 0.2s ease;
    }

    .hero-feature-card:hover {
      transform: translateY(-4px);
    }

    .hero-feature-card .icon-label {
      font-weight: 900;
      font-size: 1rem;
      color: var(--text-main);
      display: flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 6px;
    }

    .hero-feature-card p {
      font-size: 0.85rem;
      color: var(--text-muted);
      line-height: 1.4;
    }

    /* 支持模型滚动/标签云 */
    .model-tags-bar {
      margin-top: 40px;
      padding: 16px 20px;
      background: #ffffff;
      border: 2px dashed var(--border-dark);
      border-radius: var(--radius-md);
    }

    .model-tags-bar-title {
      font-size: 0.9rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 12px;
      text-align: center;
    }

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

    .model-pill {
      font-size: 0.78rem;
      font-weight: 700;
      padding: 4px 10px;
      background: var(--bg-alt);
      border: 1.5px solid var(--border-dark);
      border-radius: var(--radius-pill);
      color: var(--text-main);
    }

    /* 平台介绍 / 关于我们 */
    .about-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
      align-items: stretch;
    }

    .about-text-card {
      background: #ffffff;
      border: 2px solid var(--border-dark);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-doodle-lg);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .about-text-card h3 {
      font-size: 1.4rem;
      font-weight: 900;
      margin-bottom: 16px;
      color: var(--text-main);
    }

    .about-text-card p {
      font-size: 0.95rem;
      color: var(--text-muted);
      margin-bottom: 16px;
      line-height: 1.7;
    }

    .stats-card-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
    }

    .stat-box {
      background: #ffffff;
      border: 2px solid var(--border-dark);
      border-radius: var(--radius-md);
      padding: 22px;
      box-shadow: var(--shadow-doodle);
    }

    .stat-box.highlight-yellow { background: #fffbe6; }
    .stat-box.highlight-cyan { background: #e8faf8; }
    .stat-box.highlight-coral { background: #fff0f0; }
    .stat-box.highlight-purple { background: #f6edff; }

    .stat-num {
      font-size: 2rem;
      font-weight: 900;
      color: var(--border-dark);
      line-height: 1;
      margin-bottom: 6px;
    }

    .stat-label {
      font-size: 0.9rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 4px;
    }

    .stat-desc {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* 卡片网格通用 */
    .cards-grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 22px;
    }

    .cards-grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 18px;
    }

    .cards-grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

    .doodle-card {
      background: var(--bg-card);
      border: 2px solid var(--border-dark);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-doodle);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }

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

    .doodle-card h4 {
      font-size: 1.15rem;
      font-weight: 900;
      margin-bottom: 10px;
      color: var(--text-main);
    }

    .doodle-card p {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    .card-top {
      margin-bottom: 14px;
    }

    .card-tag {
      font-size: 0.75rem;
      font-weight: 800;
      padding: 2px 8px;
      border-radius: var(--radius-pill);
      border: 1.5px solid var(--border-dark);
      display: inline-block;
      margin-bottom: 10px;
    }

    /* 图文素材卡片展示 */
    .media-card {
      background: #ffffff;
      border: 2px solid var(--border-dark);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-doodle);
    }

    .media-card .img-box {
      border-bottom: 2px solid var(--border-dark);
      aspect-ratio: 16/9;
      background: #eee;
      overflow: hidden;
    }

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

    .media-card .img-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .media-card .media-body {
      padding: 18px;
    }

    /* 流程 Steps */
    .steps-timeline {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      position: relative;
    }

    .step-item {
      background: #ffffff;
      border: 2px solid var(--border-dark);
      border-radius: var(--radius-md);
      padding: 22px 18px;
      box-shadow: var(--shadow-doodle);
      position: relative;
    }

    .step-badge {
      width: 36px;
      height: 36px;
      background: var(--color-yellow);
      border: 2px solid var(--border-dark);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      font-size: 1.1rem;
      margin-bottom: 14px;
      box-shadow: 2px 2px 0 var(--border-dark);
    }

    .step-item h4 {
      font-size: 1.05rem;
      font-weight: 900;
      margin-bottom: 8px;
    }

    .step-item p {
      font-size: 0.85rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 对比评测表格 */
    .eval-box {
      background: #ffffff;
      border: 2px solid var(--border-dark);
      border-radius: var(--radius-lg);
      padding: 30px;
      box-shadow: var(--shadow-doodle-lg);
    }

    .eval-score-header {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
      padding-bottom: 24px;
      margin-bottom: 24px;
      border-bottom: 2px dashed var(--border-dark);
    }

    .score-badge-wrap {
      display: flex;
      align-items: center;
      gap: 14px;
    }

    .score-big {
      font-size: 3rem;
      font-weight: 900;
      color: var(--border-dark);
      line-height: 1;
      background: var(--color-yellow);
      padding: 6px 14px;
      border: 2px solid var(--border-dark);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-doodle);
    }

    .score-info h4 {
      font-size: 1.25rem;
      font-weight: 900;
      color: var(--text-main);
    }

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

    .table-container {
      overflow-x: auto;
    }

    .custom-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 600px;
    }

    .custom-table th, .custom-table td {
      padding: 14px 16px;
      border-bottom: 1.5px solid #e2ded5;
      font-size: 0.92rem;
    }

    .custom-table th {
      background: #fbf9f4;
      font-weight: 900;
      color: var(--text-main);
      border-bottom: 2px solid var(--border-dark);
    }

    .custom-table tr:hover td {
      background: #fffdf5;
    }

    .table-highlight {
      font-weight: 800;
      color: #0b7285;
      background: #eefbfc !important;
    }

    /* FAQ 手风琴 */
    .faq-list {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

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

    .faq-question {
      padding: 18px 22px;
      font-size: 1.05rem;
      font-weight: 800;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
      background: #ffffff;
    }

    .faq-question:hover {
      background: #fffcf0;
    }

    .faq-icon {
      font-size: 1.2rem;
      font-weight: 900;
      transition: transform 0.2s ease;
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: #faf8f5;
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

    .faq-item.active .faq-answer {
      max-height: 250px;
      padding: 16px 22px 20px;
      border-top: 1.5px dashed #dedad0;
    }

    /* 评论卡片 */
    .review-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .review-card {
      background: #ffffff;
      border: 2px solid var(--border-dark);
      border-radius: var(--radius-md);
      padding: 22px;
      box-shadow: var(--shadow-doodle);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .reviewer-meta {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 18px;
      padding-top: 14px;
      border-top: 1.5px dashed #e5e0d8;
    }

    .reviewer-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      border: 2px solid var(--border-dark);
      background: var(--color-yellow);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      font-size: 1.1rem;
    }

    .reviewer-info h5 {
      font-size: 0.95rem;
      font-weight: 800;
    }

    .reviewer-info span {
      font-size: 0.78rem;
      color: var(--text-muted);
    }

    /* 表单区域 */
    .form-wrapper {
      background: #ffffff;
      border: 2px solid var(--border-dark);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-doodle-lg);
    }

    .form-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 18px;
      margin-bottom: 20px;
    }

    .form-group-full {
      grid-column: span 2;
    }

    .form-group label {
      display: block;
      font-size: 0.88rem;
      font-weight: 800;
      margin-bottom: 6px;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 12px 14px;
      font-size: 0.92rem;
      border: 2px solid var(--border-dark);
      border-radius: var(--radius-sm);
      background: #fdfbf7;
      color: var(--text-main);
      outline: none;
    }

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

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

    /* 联系与二维码卡片 */
    .contact-info-grid {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 30px;
    }

    .contact-details {
      background: #ffffff;
      border: 2px solid var(--border-dark);
      border-radius: var(--radius-lg);
      padding: 30px;
      box-shadow: var(--shadow-doodle-lg);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .qr-box-wrap {
      display: flex;
      align-items: center;
      gap: 20px;
      background: #fcf8ee;
      border: 2px dashed var(--border-dark);
      border-radius: var(--radius-md);
      padding: 16px;
      margin-top: 20px;
    }

    .qr-box-wrap img {
      width: 110px;
      height: 110px;
      object-fit: contain;
      border: 2px solid var(--border-dark);
      border-radius: var(--radius-sm);
      background: #fff;
    }

    /* 文章专区 */
    .article-links-box {
      background: #ffffff;
      border: 2px solid var(--border-dark);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-doodle);
    }

    .article-list {
      list-style: none;
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 12px;
    }

    .article-list a {
      display: block;
      padding: 10px 14px;
      background: var(--bg-alt);
      border: 1.5px solid var(--border-dark);
      border-radius: var(--radius-sm);
      font-size: 0.88rem;
      font-weight: 700;
      color: var(--text-main);
    }

    .article-list a:hover {
      background: var(--color-yellow);
    }

    /* 页脚 */
    .site-footer {
      background: #f4f1ea;
      border-top: 2px solid var(--border-dark);
      padding: 48px 0 24px;
      color: var(--text-main);
    }

    .footer-top {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr;
      gap: 30px;
      margin-bottom: 36px;
    }

    .footer-col h4 {
      font-size: 1.1rem;
      font-weight: 900;
      margin-bottom: 14px;
      color: var(--text-main);
    }

    .footer-links-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }

    .footer-links-wrap a {
      font-size: 0.85rem;
      font-weight: 600;
      padding: 4px 10px;
      background: #ffffff;
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-sm);
      color: var(--text-main);
    }

    .footer-links-wrap a:hover {
      background: var(--color-yellow);
    }

    .footer-bottom {
      border-top: 1.5px dashed #d5d0c5;
      padding-top: 20px;
      text-align: center;
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    /* 浮动客服入口与返回顶部 */
    .floating-widget {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      background: var(--color-yellow);
      border: 2px solid var(--border-dark);
      border-radius: 50%;
      box-shadow: var(--shadow-doodle);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      font-size: 1rem;
      cursor: pointer;
      transition: transform 0.2s;
    }

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

    /* 响应式媒体查询 */
    @media (max-width: 1024px) {
      .hero-features-grid, .cards-grid-4, .steps-timeline {
        grid-template-columns: repeat(2, 1fr);
      }
      .cards-grid-3, .review-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-top {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links, .nav-cta {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      .nav-links.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 74px;
        left: 0;
        right: 0;
        background: #ffffff;
        border-bottom: 2px solid var(--border-dark);
        padding: 16px 20px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.08);
      }
      .nav-links.active a {
        width: 100%;
        padding: 10px 0;
        border-bottom: 1px dashed #eae5db;
      }
      .hero-h1 {
        font-size: 1.8rem;
      }
      .hero-features-grid, .about-grid, .cards-grid-3, .cards-grid-4, .cards-grid-2, .review-grid, .form-grid, .contact-info-grid, .steps-timeline, .article-list {
        grid-template-columns: 1fr;
      }
      .form-group-full {
        grid-column: span 1;
      }
      .eval-score-header {
        flex-direction: column;
        align-items: flex-start;
      }
    }