:root {
      --primary: #ff3366;
      --primary-hover: #e02456;
      --accent-cyan: #00e5ff;
      --accent-yellow: #ffe600;
      --accent-purple: #7928ca;
      --text-main: #18191f;
      --text-muted: #535965;
      --bg-page: #fafbfe;
      --bg-surface: #ffffff;
      --border-color: #e5e8f0;
      --shadow-sm: 0 4px 12px rgba(24, 25, 31, 0.04);
      --shadow-md: 0 12px 32px rgba(24, 25, 31, 0.08);
      --shadow-pop: 5px 5px 0px #18191f;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      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;
      overflow-x: hidden;
    }

    a {
      color: inherit;
      text-decoration: none;
    }

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

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(10px);
      border-bottom: 2px solid var(--text-main);
    }

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

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

    .brand-wrap .ai-page-logo {
      height: 38px;
      width: auto;
      display: block;
    }

    .brand-name {
      font-size: 20px;
      font-weight: 800;
      letter-spacing: -0.5px;
      color: var(--text-main);
    }

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

    .nav-links a {
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      transition: all 0.2s ease;
    }

    .nav-links a:hover {
      background-color: var(--accent-yellow);
      color: var(--text-main);
    }

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

    .btn-contrast-hero {
      background-color: var(--accent-yellow);
      color: var(--text-main);
      font-weight: 800;
      padding: 10px 20px;
      border-radius: var(--radius-sm);
      border: 2px solid var(--text-main);
      box-shadow: 3px 3px 0px var(--text-main);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: transform 0.15s ease, box-shadow 0.15s ease;
    }

    .btn-contrast-hero:hover {
      transform: translate(-2px, -2px);
      box-shadow: 5px 5px 0px var(--text-main);
    }

    .btn-primary {
      background-color: var(--primary);
      color: #ffffff;
      font-weight: 700;
      padding: 12px 24px;
      border-radius: var(--radius-sm);
      border: 2px solid var(--text-main);
      box-shadow: var(--shadow-pop);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      transition: all 0.2s ease;
    }

    .btn-primary:hover {
      transform: translate(-2px, -2px);
      box-shadow: 7px 7px 0px var(--text-main);
      background-color: var(--primary-hover);
    }

    .btn-secondary {
      background-color: var(--accent-cyan);
      color: var(--text-main);
      font-weight: 700;
      padding: 12px 24px;
      border-radius: var(--radius-sm);
      border: 2px solid var(--text-main);
      box-shadow: var(--shadow-pop);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all 0.2s ease;
    }

    .btn-secondary:hover {
      transform: translate(-2px, -2px);
      box-shadow: 7px 7px 0px var(--text-main);
      background-color: #33ecff;
    }

    /* 移动端汉堡 */
    .mobile-menu-btn {
      display: none;
      background: none;
      border: 2px solid var(--text-main);
      padding: 6px;
      border-radius: 6px;
      cursor: pointer;
    }

    /* Hero 首屏 (无图规范) */
    .hero-section {
      background: linear-gradient(180deg, #fffbee 0%, #ffffff 100%);
      padding: 70px 0 60px;
      border-bottom: 2px solid var(--text-main);
      position: relative;
    }

    .hero-layout {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 40px;
      align-items: center;
    }

    .hero-tagline {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: var(--accent-yellow);
      border: 2px solid var(--text-main);
      padding: 6px 14px;
      border-radius: 30px;
      font-weight: 700;
      font-size: 13px;
      margin-bottom: 20px;
      box-shadow: 3px 3px 0px var(--text-main);
    }

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

    .hero-title span {
      background: linear-gradient(120deg, var(--primary) 0%, var(--accent-purple) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 16px;
      color: var(--text-muted);
      margin-bottom: 30px;
      max-width: 580px;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 30px;
    }

    .hero-stats-board {
      background: #ffffff;
      border: 2px solid var(--text-main);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-pop);
      padding: 24px;
    }

    .stats-board-header {
      font-weight: 800;
      font-size: 16px;
      border-bottom: 2px dashed var(--border-color);
      padding-bottom: 12px;
      margin-bottom: 18px;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .stats-board-badge {
      background: var(--accent-cyan);
      font-size: 12px;
      padding: 3px 8px;
      border-radius: 4px;
      border: 1px solid var(--text-main);
    }

    .stats-matrix {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }

    .matrix-item {
      background: #f8f9fc;
      border: 1.5px solid var(--border-color);
      border-radius: var(--radius-sm);
      padding: 14px;
    }

    .matrix-item .matrix-label {
      font-size: 12px;
      color: var(--text-muted);
      font-weight: 600;
    }

    .matrix-item .matrix-value {
      font-size: 22px;
      font-weight: 800;
      color: var(--primary);
      margin-top: 4px;
    }

    /* 模块通用样式 */
    .section-spacing {
      padding: 80px 0;
      border-bottom: 2px solid var(--text-main);
    }

    .section-head {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 50px;
    }

    .section-badge {
      display: inline-block;
      background: var(--accent-yellow);
      border: 2px solid var(--text-main);
      padding: 4px 14px;
      font-size: 12px;
      font-weight: 800;
      text-transform: uppercase;
      border-radius: 20px;
      margin-bottom: 12px;
      box-shadow: 2px 2px 0px var(--text-main);
    }

    .section-title {
      font-size: 32px;
      font-weight: 900;
      color: var(--text-main);
      margin-bottom: 14px;
    }

    .section-subtitle {
      font-size: 15px;
      color: var(--text-muted);
    }

    /* 撞色网格与卡片 */
    .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: 24px;
    }

    .contrast-card {
      background: #ffffff;
      border: 2px solid var(--text-main);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: 4px 4px 0px var(--text-main);
      transition: all 0.2s ease;
      display: flex;
      flex-direction: column;
    }

    .contrast-card:hover {
      transform: translate(-3px, -3px);
      box-shadow: 7px 7px 0px var(--text-main);
    }

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

    .card-icon-pill {
      width: 38px;
      height: 38px;
      border-radius: 8px;
      border: 2px solid var(--text-main);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      font-size: 16px;
      flex-shrink: 0;
    }

    .bg-pink { background: #ff7597; }
    .bg-cyan { background: var(--accent-cyan); }
    .bg-yellow { background: var(--accent-yellow); }
    .bg-purple { background: #b794f4; }
    .bg-green { background: #68d391; }

    .contrast-card h3 {
      font-size: 18px;
      font-weight: 800;
    }

    .contrast-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.55;
    }

    /* 支持模型标签云 */
    .models-marquee-box {
      background: #fdf2f4;
      border: 2px solid var(--text-main);
      border-radius: var(--radius-md);
      padding: 24px;
      margin-top: 30px;
    }

    .models-flex {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
    }

    .model-chip {
      background: #ffffff;
      border: 1.5px solid var(--text-main);
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 700;
      box-shadow: 2px 2px 0px var(--text-main);
      transition: transform 0.15s ease;
    }

    .model-chip:hover {
      transform: scale(1.05);
      background: var(--accent-yellow);
    }

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

    .step-card {
      background: #ffffff;
      border: 2px solid var(--text-main);
      border-radius: var(--radius-md);
      padding: 24px 20px;
      position: relative;
      box-shadow: 4px 4px 0px var(--text-main);
    }

    .step-num {
      position: absolute;
      top: -16px;
      left: 18px;
      background: var(--primary);
      color: #fff;
      border: 2px solid var(--text-main);
      width: 32px;
      height: 32px;
      border-radius: 50%;
      font-weight: 800;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 14px;
    }

    .step-card h4 {
      font-size: 17px;
      font-weight: 800;
      margin: 12px 0 8px;
    }

    .step-card p {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 对比评测高亮专区 */
    .review-highlight-box {
      background: #ffffff;
      border: 3px solid var(--text-main);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: 8px 8px 0px var(--text-main);
      margin-bottom: 40px;
    }

    .review-score-banner {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
      background: linear-gradient(135deg, #fff3b0 0%, #caefff 100%);
      border: 2px solid var(--text-main);
      border-radius: var(--radius-md);
      padding: 24px;
      margin-bottom: 30px;
    }

    .score-left h3 {
      font-size: 22px;
      font-weight: 900;
    }

    .score-left p {
      font-size: 14px;
      font-weight: 600;
      color: var(--text-muted);
    }

    .score-badges {
      display: flex;
      align-items: center;
      gap: 20px;
    }

    .star-score {
      font-size: 24px;
      color: #ff9900;
      font-weight: 800;
    }

    .num-score {
      font-size: 38px;
      font-weight: 900;
      color: var(--primary);
      border-left: 2px solid var(--text-main);
      padding-left: 20px;
    }

    .table-responsive {
      overflow-x: auto;
      border: 2px solid var(--text-main);
      border-radius: var(--radius-md);
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      background: #fff;
    }

    .compare-table th, .compare-table td {
      padding: 16px 20px;
      border-bottom: 1.5px solid var(--border-color);
      font-size: 14px;
    }

    .compare-table th {
      background: #f4f6fb;
      font-weight: 800;
      border-bottom: 2px solid var(--text-main);
    }

    .compare-table tr:hover {
      background: #fffbe6;
    }

    .highlight-col {
      background: #fffdf2;
      font-weight: 700;
      color: var(--primary);
    }

    /* 案例展示区 */
    .case-media-card {
      background: #ffffff;
      border: 2px solid var(--text-main);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: 4px 4px 0px var(--text-main);
      display: flex;
      flex-direction: column;
    }

    .case-media-img-wrap {
      width: 100%;
      aspect-ratio: 16 / 9;
      background: #eceef4;
      overflow: hidden;
      border-bottom: 2px solid var(--text-main);
    }

    .case-media-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
    }

    .case-content {
      padding: 20px;
      flex: 1;
    }

    .case-content h4 {
      font-size: 17px;
      font-weight: 800;
      margin-bottom: 8px;
    }

    .case-content p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 用户评论 */
    .review-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .review-card {
      background: #ffffff;
      border: 2px solid var(--text-main);
      border-radius: var(--radius-md);
      padding: 22px;
      box-shadow: 4px 4px 0px var(--text-main);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .review-meta {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 12px;
    }

    .review-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      border: 2px solid var(--text-main);
      background: var(--accent-yellow);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 16px;
    }

    .review-author {
      font-weight: 800;
      font-size: 15px;
    }

    .review-role {
      font-size: 12px;
      color: var(--text-muted);
    }

    .review-quote {
      font-size: 13.5px;
      color: var(--text-main);
      line-height: 1.6;
      font-style: normal;
    }

    /* FAQ 折叠 */
    .faq-container {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .faq-item {
      background: #ffffff;
      border: 2px solid var(--text-main);
      border-radius: var(--radius-md);
      box-shadow: 3px 3px 0px var(--text-main);
      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-main);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }

    .faq-icon {
      font-size: 18px;
      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;
      background: #fbfcff;
      border-top: 1.5px dashed var(--border-color);
    }

    .faq-answer-inner {
      padding: 18px 24px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 表单与需求匹配区 */
    .contact-form-section {
      background: #fdfae6;
      border-bottom: 2px solid var(--text-main);
    }

    .form-wrapper {
      background: #ffffff;
      border: 3px solid var(--text-main);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: 7px 7px 0px var(--text-main);
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }

    .form-info h3 {
      font-size: 26px;
      font-weight: 900;
      margin-bottom: 16px;
    }

    .form-info p {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 24px;
    }

    .info-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
      font-size: 14px;
      font-weight: 600;
    }

    .info-list li span {
      display: inline-block;
      min-width: 80px;
      color: var(--text-muted);
    }

    .ai-styled-form {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    .form-group label {
      font-size: 13px;
      font-weight: 700;
      color: var(--text-main);
    }

    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 12px 14px;
      border: 2px solid var(--text-main);
      border-radius: var(--radius-sm);
      font-size: 14px;
      background: #ffffff;
      outline: none;
      font-family: inherit;
    }

    .form-input:focus, .form-select:focus, .form-textarea:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(255, 51, 102, 0.15);
    }

    .form-textarea {
      resize: vertical;
      min-height: 90px;
    }

    /* 文章列表与资讯 */
    .article-box {
      background: #ffffff;
      border: 2px solid var(--text-main);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: 4px 4px 0px var(--text-main);
      margin-bottom: 24px;
    }

    .article-links-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 14px;
    }

    .article-pill {
      background: #f4f6fb;
      border: 1.5px solid var(--text-main);
      padding: 8px 16px;
      border-radius: var(--radius-sm);
      font-size: 13px;
      font-weight: 700;
      transition: all 0.2s ease;
    }

    .article-pill:hover {
      background: var(--accent-cyan);
      transform: translateY(-2px);
    }

    /* 友情链接 */
    .friendly-links-card {
      background: #f8fafc;
      border: 2px solid var(--text-main);
      border-radius: var(--radius-md);
      padding: 20px;
      margin-top: 30px;
    }

    .friendly-links-card h4 {
      font-size: 15px;
      font-weight: 800;
      margin-bottom: 12px;
    }

    .friendly-flex {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
    }

    .friendly-flex a {
      font-size: 13px;
      font-weight: 600;
      color: var(--text-main);
      text-decoration: underline;
    }

    .friendly-flex a:hover {
      color: var(--primary);
    }

    /* 底部通用规范 */
    .site-footer {
      background: #18191f;
      color: #ffffff;
      padding: 60px 0 30px;
      border-top: 3px solid var(--text-main);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 40px;
      padding-bottom: 40px;
      border-bottom: 1px solid #2e313d;
    }

    .footer-brand h4 {
      font-size: 22px;
      font-weight: 900;
      color: #ffffff;
      margin-bottom: 12px;
    }

    .footer-brand p {
      font-size: 13px;
      color: #a0a6b5;
      line-height: 1.6;
    }

    .footer-col h5 {
      font-size: 15px;
      font-weight: 800;
      color: var(--accent-yellow);
      margin-bottom: 16px;
    }

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

    .footer-col a {
      font-size: 13px;
      color: #c2c7d0;
      transition: color 0.15s ease;
    }

    .footer-col a:hover {
      color: var(--accent-cyan);
    }

    .qr-card {
      display: flex;
      flex-direction: column;
      align-items: flex-start;
      gap: 8px;
    }

    .qr-card img {
      width: 90px;
      height: 90px;
      border-radius: 6px;
      border: 2px solid #ffffff;
      background: #fff;
    }

    .qr-card span {
      font-size: 12px;
      color: #a0a6b5;
    }

    .footer-bottom {
      padding-top: 24px;
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      align-items: center;
      font-size: 13px;
      color: #7e8597;
    }

    .footer-bottom a {
      color: #a0a6b5;
    }

    /* 悬浮客服挂件 */
    .floating-service {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: var(--accent-yellow);
      border: 2px solid var(--text-main);
      box-shadow: 3px 3px 0px var(--text-main);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      font-size: 13px;
      color: var(--text-main);
      cursor: pointer;
      position: relative;
    }

    .float-btn:hover .float-hover-content {
      display: block;
    }

    .float-hover-content {
      display: none;
      position: absolute;
      right: 60px;
      bottom: 0;
      background: #ffffff;
      border: 2px solid var(--text-main);
      border-radius: var(--radius-sm);
      padding: 12px;
      box-shadow: 4px 4px 0px var(--text-main);
      width: 140px;
      text-align: center;
    }

    .float-hover-content img {
      width: 100%;
      height: auto;
      border-radius: 4px;
      display: block;
      margin-bottom: 6px;
    }

    .float-hover-content p {
      font-size: 12px;
      color: var(--text-main);
      font-weight: 700;
    }

    /* 响应式优化 */
    @media (max-width: 992px) {
      .hero-layout {
        grid-template-columns: 1fr;
      }
      .grid-3, .review-grid, .process-timeline {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .form-wrapper {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .nav-links {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      .nav-links.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        border-bottom: 2px solid var(--text-main);
        padding: 20px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
      }
    }

    @media (max-width: 600px) {
      .hero-title {
        font-size: 28px;
      }
      .grid-3, .grid-4, .grid-2, .review-grid, .process-timeline {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .stats-matrix {
        grid-template-columns: 1fr;
      }
      .section-spacing {
        padding: 50px 0;
      }
      .form-wrapper {
        padding: 20px;
      }
    }