/* 多彩涂鸦 Pop Light Design System */
    :root {
      --bg-main: #FAF8F5;
      --bg-card: #FFFFFF;
      --text-dark: #1E232A;
      --text-muted: #5A6474;
      --primary: #5C3BFF;
      --primary-hover: #4526E6;
      --pop-yellow: #FFD13B;
      --pop-pink: #FF477E;
      --pop-cyan: #00E5FF;
      --pop-green: #00D26A;
      --border-dark: #1E232A;
      --shadow-pop: 4px 4px 0px #1E232A;
      --shadow-pop-hover: 6px 6px 0px #1E232A;
      --radius: 12px;
      --radius-sm: 8px;
    }

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

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      background-color: var(--bg-main);
      color: var(--text-dark);
      line-height: 1.6;
    }

    body {
      overflow-x: hidden;
      background: radial-gradient(circle at 10% 10%, rgba(255, 209, 59, 0.15), transparent 40%),
                  radial-gradient(circle at 90% 80%, rgba(0, 229, 255, 0.15), transparent 40%),
                  var(--bg-main);
    }

    /* 统一页面主容器 */
    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 顶部导航 */
    header.site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(250, 248, 245, 0.92);
      backdrop-filter: blur(10px);
      border-bottom: 2px solid var(--border-dark);
    }

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

    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      text-decoration: none;
      color: var(--text-dark);
      font-weight: 800;
      font-size: 20px;
    }

    .brand-logo img {
      height: 40px;
      width: auto;
      object-fit: contain;
    }

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

    /* 规则严格要求: .nav-links 的 gap 属性设置为 0 */
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }

    .nav-links li a {
      display: inline-block;
      padding: 8px 14px;
      margin: 0 2px;
      color: var(--text-dark);
      text-decoration: none;
      font-weight: 600;
      font-size: 14px;
      border-radius: var(--radius-sm);
      transition: all 0.2s ease;
    }

    .nav-links li a:hover {
      background: var(--pop-yellow);
      color: var(--text-dark);
      transform: translateY(-2px);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 20px;
      font-size: 15px;
      font-weight: 700;
      text-decoration: none;
      border-radius: var(--radius-sm);
      border: 2px solid var(--border-dark);
      box-shadow: var(--shadow-pop);
      cursor: pointer;
      transition: all 0.15s ease;
      white-space: nowrap;
    }

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

    .btn:active {
      transform: translate(1px, 1px);
      box-shadow: 2px 2px 0px var(--border-dark);
    }

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

    .btn-pop {
      background-color: var(--pop-yellow);
      color: var(--text-dark);
    }

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

    /* 移动端菜单开关 */
    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--text-dark);
    }

    /* Section 通用样式 */
    section.page-section {
      padding: 80px 0;
      border-bottom: 2px dashed rgba(30, 35, 42, 0.15);
    }

    .section-header {
      text-align: center;
      margin-bottom: 48px;
    }

    .section-badge {
      display: inline-block;
      padding: 4px 12px;
      background: var(--pop-pink);
      color: #FFFFFF;
      font-size: 13px;
      font-weight: 800;
      border: 2px solid var(--border-dark);
      border-radius: 20px;
      box-shadow: 2px 2px 0px var(--border-dark);
      margin-bottom: 12px;
      text-transform: uppercase;
      letter-spacing: 1px;
    }

    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-dark);
      margin-bottom: 12px;
    }

    .section-subtitle {
      font-size: 16px;
      color: var(--text-muted);
      max-width: 700px;
      margin: 0 auto;
    }

    /* 首屏 HERO 区域 - 严禁出现图片 */
    .hero-section {
      padding: 90px 0 70px 0;
      background: linear-gradient(135deg, rgba(255, 209, 59, 0.12) 0%, rgba(92, 59, 255, 0.08) 100%);
      border-bottom: 2px solid var(--border-dark);
      position: relative;
    }

    .hero-content {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
    }

    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: var(--pop-cyan);
      color: var(--text-dark);
      padding: 6px 16px;
      border-radius: 30px;
      border: 2px solid var(--border-dark);
      box-shadow: var(--shadow-pop);
      font-weight: 700;
      font-size: 14px;
      margin-bottom: 24px;
    }

    .hero-title {
      font-size: 42px;
      line-height: 1.25;
      font-weight: 900;
      color: var(--text-dark);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-description {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 36px;
      line-height: 1.7;
    }

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

    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 40px;
    }

    .metric-card {
      background: var(--bg-card);
      border: 2px solid var(--border-dark);
      border-radius: var(--radius);
      padding: 20px;
      box-shadow: var(--shadow-pop);
      text-align: center;
    }

    .metric-num {
      font-size: 32px;
      font-weight: 900;
      color: var(--primary);
      margin-bottom: 4px;
    }

    .metric-label {
      font-size: 13px;
      font-weight: 700;
      color: var(--text-muted);
    }

    /* 通用卡片网格 */
    .grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
    .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
    .grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }

    .pop-card {
      background: var(--bg-card);
      border: 2px solid var(--border-dark);
      border-radius: var(--radius);
      padding: 28px;
      box-shadow: var(--shadow-pop);
      transition: all 0.2s ease;
      position: relative;
    }

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

    .card-icon-badge {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      border: 2px solid var(--border-dark);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      font-size: 20px;
      margin-bottom: 16px;
      box-shadow: 2px 2px 0px var(--border-dark);
    }

    .card-title {
      font-size: 20px;
      font-weight: 800;
      margin-bottom: 10px;
      color: var(--text-dark);
    }

    .card-text {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 服务与模型能力墙 */
    .model-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 24px;
      justify-content: center;
    }

    .model-tag {
      background: #FFFFFF;
      border: 2px solid var(--border-dark);
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 700;
      box-shadow: 2px 2px 0px var(--border-dark);
    }

    /* 对比评测样式 */
    .rating-box {
      background: var(--pop-yellow);
      border: 2px solid var(--border-dark);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-pop);
      text-align: center;
      margin-bottom: 32px;
      display: flex;
      align-items: center;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 20px;
    }

    .rating-item {
      font-weight: 800;
      font-size: 20px;
    }

    .rating-score {
      font-size: 38px;
      color: var(--primary);
      font-weight: 900;
    }

    .comparison-table-wrapper {
      overflow-x: auto;
      border: 2px solid var(--border-dark);
      border-radius: var(--radius);
      box-shadow: var(--shadow-pop);
      background: #FFFFFF;
    }

    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 650px;
    }

    .comparison-table th, .comparison-table td {
      padding: 16px 20px;
      border-bottom: 1px solid rgba(30, 35, 42, 0.1);
      border-right: 1px solid rgba(30, 35, 42, 0.1);
      font-size: 14px;
    }

    .comparison-table th {
      background: #F0EDF9;
      font-weight: 800;
      color: var(--text-dark);
    }

    .comparison-table tr:hover {
      background-color: rgba(255, 209, 59, 0.1);
    }

    .highlight-cell {
      background: rgba(92, 59, 255, 0.06);
      font-weight: 700;
      color: var(--primary);
    }

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

    .step-num {
      position: absolute;
      top: -14px;
      right: 14px;
      background: var(--pop-pink);
      color: #FFFFFF;
      width: 32px;
      height: 32px;
      border: 2px solid var(--border-dark);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      font-size: 14px;
    }

    /* 案例图片展示 */
    .case-card {
      background: #FFFFFF;
      border: 2px solid var(--border-dark);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-pop);
    }

    .case-img-container {
      width: 100%;
      border-bottom: 2px solid var(--border-dark);
      overflow: hidden;
      background: #EAE8E3;
    }

    .case-img-container img {
      width: 100%;
      height: auto;
      display: block;
      transition: transform 0.3s ease;
    }

    .case-card:hover .case-img-container img {
      transform: scale(1.03);
    }

    .case-info {
      padding: 20px;
    }

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

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

    .faq-question {
      width: 100%;
      padding: 18px 24px;
      text-align: left;
      background: none;
      border: none;
      font-size: 16px;
      font-weight: 800;
      color: var(--text-dark);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .faq-question::after {
      content: '+';
      font-size: 20px;
      font-weight: 900;
      color: var(--primary);
    }

    .faq-item.active .faq-question::after {
      content: '-';
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      padding: 0 24px;
      color: var(--text-muted);
      font-size: 14px;
      line-height: 1.7;
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 0 24px 20px 24px;
      border-top: 1px dashed rgba(30, 35, 42, 0.15);
    }

    /* 用户评论 */
    .review-card {
      background: #FFFFFF;
      border: 2px solid var(--border-dark);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-pop);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 16px;
    }

    .avatar-placeholder {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      border: 2px solid var(--border-dark);
      background: var(--pop-cyan);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      font-size: 16px;
    }

    /* 文章列表 */
    .article-item {
      background: #FFFFFF;
      border: 2px solid var(--border-dark);
      border-radius: var(--radius-sm);
      padding: 16px 20px;
      margin-bottom: 12px;
      box-shadow: 2px 2px 0px var(--border-dark);
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .article-item a {
      color: var(--text-dark);
      font-weight: 700;
      text-decoration: none;
    }

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

    /* 联系表单 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      background: #FFFFFF;
      border: 2px solid var(--border-dark);
      border-radius: var(--radius);
      padding: 36px;
      box-shadow: var(--shadow-pop);
    }

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

    .form-group label {
      display: block;
      font-weight: 700;
      font-size: 14px;
      margin-bottom: 8px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 2px solid var(--border-dark);
      border-radius: var(--radius-sm);
      font-size: 14px;
      background: var(--bg-main);
      color: var(--text-dark);
      outline: none;
    }

    .form-control:focus {
      background: #FFFFFF;
      border-color: var(--primary);
    }

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

    .contact-info-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 16px;
      margin-top: 20px;
    }

    .contact-info-item {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 15px;
      font-weight: 600;
    }

    .qr-container {
      margin-top: 20px;
      display: inline-block;
      padding: 10px;
      background: #FFFFFF;
      border: 2px solid var(--border-dark);
      border-radius: var(--radius-sm);
      box-shadow: 2px 2px 0px var(--border-dark);
    }

    .qr-container img {
      width: 130px;
      height: 130px;
      object-fit: cover;
      display: block;
    }

    /* 页脚 */
    footer.site-footer {
      background: #FFFFFF;
      border-top: 2px solid var(--border-dark);
      padding: 50px 0 30px 0;
      color: var(--text-dark);
    }

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

    .footer-col h4 {
      font-size: 16px;
      font-weight: 800;
      margin-bottom: 16px;
    }

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

    .footer-links li {
      margin-bottom: 10px;
    }

    .footer-links li a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 14px;
      font-weight: 600;
    }

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

    .friendship-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 20px;
      padding-top: 20px;
      border-top: 1px dashed rgba(30, 35, 42, 0.2);
    }

    .friendship-links a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 13px;
      font-weight: 600;
      background: rgba(0, 0, 0, 0.04);
      padding: 4px 10px;
      border-radius: 4px;
    }

    .friendship-links a:hover {
      background: var(--pop-yellow);
      color: var(--text-dark);
    }

    .copyright-bar {
      text-align: center;
      padding-top: 24px;
      border-top: 1px solid rgba(30, 35, 42, 0.1);
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 浮动组件 */
    .floating-widget {
      position: fixed;
      bottom: 30px;
      right: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .float-btn {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: var(--pop-yellow);
      border: 2px solid var(--border-dark);
      box-shadow: var(--shadow-pop);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      font-size: 18px;
      color: var(--text-dark);
      cursor: pointer;
      text-decoration: none;
      transition: all 0.2s ease;
    }

    .float-btn:hover {
      transform: scale(1.1);
    }

    /* 响应式适配 */
    @media (max-width: 992px) {
      .grid-4, .step-list { grid-template-columns: repeat(2, 1fr); }
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .hero-metrics { grid-template-columns: repeat(2, 1fr); }
      .contact-wrapper { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      .mobile-menu-toggle { display: block; }
      nav.main-nav {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: var(--bg-main);
        border-bottom: 2px solid var(--border-dark);
        padding: 20px;
      }
      nav.main-nav.active { display: block; }
      .nav-links {
        flex-direction: column;
        align-items: flex-start;
      }
      .nav-links li { width: 100%; }
      .nav-links li a { width: 100%; margin: 4px 0; }
      .hero-title { font-size: 28px; }
      .grid-2, .grid-3, .grid-4, .step-list { grid-template-columns: 1fr; }
      .hero-metrics { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }