:root {
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --color-primary: #0f172a;
      --color-accent-blue: #0284c7;
      --color-accent-orange: #ea580c;
      --color-accent-yellow: #facc15;
      --color-accent-purple: #7c3aed;
      --color-accent-green: #059669;
      --text-dark: #0f172a;
      --text-muted: #475569;
      --border-color: #0f172a;
      --shadow-solid: 4px 4px 0px #0f172a;
      --shadow-solid-lg: 6px 6px 0px #0f172a;
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
    }

    * {
      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;
    }

    body {
      background-color: var(--bg-main);
      color: var(--text-dark);
      line-height: 1.6;
      overflow-x: hidden;
    }

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

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
      width: 100%;
    }

    /* 顶部导航 */
    .site-header {
      background: #ffffff;
      border-bottom: 2px solid var(--border-color);
      position: sticky;
      top: 0;
      z-index: 100;
    }

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

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

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

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

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

    .nav-links li a {
      display: block;
      padding: 8px 14px;
      font-size: 14px;
      font-weight: 700;
      color: var(--text-dark);
      transition: background-color 0.2s, color 0.2s;
      border-radius: var(--radius-sm);
    }

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

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

    .btn-contrast {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 9px 18px;
      font-size: 14px;
      font-weight: 700;
      background: var(--color-accent-yellow);
      color: var(--text-dark);
      border: 2px solid var(--border-color);
      border-radius: var(--radius-sm);
      box-shadow: 2px 2px 0px var(--border-color);
      cursor: pointer;
      transition: transform 0.15s, box-shadow 0.15s;
    }

    .btn-contrast:hover {
      transform: translate(-1px, -1px);
      box-shadow: 3px 3px 0px var(--border-color);
    }

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

    .btn-primary-action {
      background: var(--color-accent-orange);
      color: #ffffff;
    }

    .nav-toggle {
      display: none;
      background: transparent;
      border: 2px solid var(--border-color);
      padding: 6px 10px;
      border-radius: var(--radius-sm);
      font-weight: 800;
      cursor: pointer;
    }

    /* 首屏纯色几何撞色 (无图片) */
    .hero-section {
      background: #ffffff;
      border-bottom: 2px solid var(--border-color);
      padding: 64px 0 54px;
      position: relative;
    }

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

    .hero-badge {
      display: inline-block;
      background: var(--color-accent-blue);
      color: #ffffff;
      font-weight: 800;
      font-size: 13px;
      padding: 4px 12px;
      border: 2px solid var(--border-color);
      box-shadow: 2px 2px 0px var(--border-color);
      margin-bottom: 18px;
      border-radius: var(--radius-sm);
    }

    .hero-title {
      font-size: 38px;
      line-height: 1.25;
      font-weight: 900;
      color: var(--text-dark);
      margin-bottom: 18px;
      letter-spacing: -0.5px;
    }

    .hero-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 28px;
      font-weight: 500;
    }

    .hero-buttons {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      align-items: center;
    }

    .btn-lg {
      padding: 14px 28px;
      font-size: 16px;
      font-weight: 800;
      border: 2px solid var(--border-color);
      border-radius: var(--radius-sm);
      box-shadow: var(--shadow-solid);
    }

    .hero-metrics-board {
      background: #eff6ff;
      border: 2px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-solid-lg);
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .metrics-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      border-bottom: 2px solid var(--border-color);
      padding-bottom: 12px;
    }

    .metrics-title {
      font-size: 16px;
      font-weight: 800;
    }

    .metrics-pill {
      background: var(--color-accent-green);
      color: #ffffff;
      font-size: 11px;
      font-weight: 800;
      padding: 3px 8px;
      border: 1.5px solid var(--border-color);
      border-radius: 4px;
    }

    .metrics-row {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 14px;
    }

    .metric-card-item {
      background: #ffffff;
      border: 2px solid var(--border-color);
      padding: 14px;
      border-radius: var(--radius-sm);
      box-shadow: 2px 2px 0px var(--border-color);
    }

    .metric-num {
      font-size: 26px;
      font-weight: 900;
      color: var(--color-accent-orange);
      display: block;
      line-height: 1.1;
      margin-bottom: 4px;
    }

    .metric-lbl {
      font-size: 12px;
      font-weight: 700;
      color: var(--text-muted);
    }

    /* 模块通用样式 */
    .section-padding {
      padding: 72px 0;
      border-bottom: 2px solid var(--border-color);
    }

    .section-header {
      text-align: center;
      max-width: 780px;
      margin: 0 auto 44px;
    }

    .section-tag {
      display: inline-block;
      font-size: 12px;
      font-weight: 800;
      text-transform: uppercase;
      padding: 4px 10px;
      border-radius: 4px;
      border: 2px solid var(--border-color);
      box-shadow: 2px 2px 0px var(--border-color);
      margin-bottom: 12px;
      background: var(--color-accent-yellow);
    }

    .section-title {
      font-size: 28px;
      font-weight: 900;
      color: var(--text-dark);
      margin-bottom: 12px;
    }

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

    /* 网格卡片 */
    .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: 28px;
    }

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

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

    .card-header-icon {
      width: 44px;
      height: 44px;
      border: 2px solid var(--border-color);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      font-weight: 900;
      margin-bottom: 16px;
      box-shadow: 2px 2px 0px var(--border-color);
    }

    .icon-yellow { background: var(--color-accent-yellow); }
    .icon-blue { background: #bae6fd; color: #0369a1; }
    .icon-orange { background: #ffedd5; color: #c2410c; }
    .icon-purple { background: #ede9fe; color: #6d28d9; }
    .icon-green { background: #dcfce7; color: #15803d; }

    .card-contrast h3 {
      font-size: 18px;
      font-weight: 800;
      margin-bottom: 10px;
    }

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

    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 14px;
    }

    .model-chip {
      font-size: 11px;
      font-weight: 700;
      padding: 3px 8px;
      background: #f1f5f9;
      border: 1px solid var(--border-color);
      border-radius: 4px;
    }

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

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

    .step-number {
      font-size: 32px;
      font-weight: 900;
      color: var(--color-accent-orange);
      line-height: 1;
      margin-bottom: 8px;
    }

    /* 评分评测 */
    .eval-box {
      background: #fefce8;
      border: 2px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-solid-lg);
      margin-bottom: 36px;
    }

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

    .rating-score {
      font-size: 42px;
      font-weight: 900;
      color: var(--color-accent-orange);
      display: flex;
      align-items: baseline;
      gap: 6px;
    }

    .rating-score span {
      font-size: 18px;
      color: var(--text-muted);
      font-weight: 700;
    }

    .stars-badge {
      background: var(--color-accent-yellow);
      border: 2px solid var(--border-color);
      font-weight: 800;
      padding: 6px 14px;
      border-radius: var(--radius-sm);
      box-shadow: 2px 2px 0px var(--border-color);
      font-size: 14px;
    }

    /* 表格组件 */
    .table-container {
      overflow-x: auto;
      border: 2px solid var(--border-color);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-solid);
      background: #ffffff;
    }

    .contrast-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 620px;
    }

    .contrast-table th {
      background: #f1f5f9;
      padding: 14px 18px;
      font-weight: 800;
      border-bottom: 2px solid var(--border-color);
      border-right: 1px solid #cbd5e1;
      font-size: 14px;
    }

    .contrast-table td {
      padding: 14px 18px;
      border-bottom: 1px solid #e2e8f0;
      border-right: 1px solid #e2e8f0;
      font-size: 14px;
      color: var(--text-dark);
    }

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

    .highlight-col {
      background: #fffbeb;
      font-weight: 700;
    }

    /* 案例图文展示容器 */
    .case-card {
      background: #ffffff;
      border: 2px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-solid);
      display: flex;
      flex-direction: column;
    }

    .case-image-wrap {
      width: 100%;
      border-bottom: 2px solid var(--border-color);
      background: #f1f5f9;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }

    .case-image-wrap img {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
      max-height: 240px;
    }

    .case-content {
      padding: 20px;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    /* FAQ 手风琴 */
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 14px;
      max-width: 880px;
      margin: 0 auto;
    }

    .faq-item {
      border: 2px solid var(--border-color);
      border-radius: var(--radius-md);
      background: #ffffff;
      box-shadow: 2px 2px 0px var(--border-color);
      overflow: hidden;
    }

    .faq-question {
      padding: 16px 20px;
      font-size: 16px;
      font-weight: 800;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
      background: #ffffff;
    }

    .faq-question:hover {
      background: #f8fafc;
    }

    .faq-icon {
      font-size: 18px;
      font-weight: 900;
      transition: transform 0.2s;
    }

    .faq-answer {
      padding: 0 20px 16px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      display: none;
      border-top: 1px solid #f1f5f9;
      padding-top: 12px;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

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

    /* 需求匹配与表单 */
    .form-wrapper {
      background: #ffffff;
      border: 2px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-solid-lg);
      max-width: 760px;
      margin: 0 auto;
    }

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

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

    .form-label {
      display: block;
      font-size: 13px;
      font-weight: 800;
      margin-bottom: 6px;
      color: var(--text-dark);
    }

    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 2px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 14px;
      background: #f8fafc;
      color: var(--text-dark);
      outline: none;
    }

    .form-control:focus {
      background: #ffffff;
      border-color: var(--color-accent-blue);
    }

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

    /* 客服与联系 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
    }

    .qr-card {
      background: #ffffff;
      border: 2px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-solid);
      text-align: center;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
    }

    .qr-wrap {
      max-width: 160px;
      margin: 14px auto;
      border: 2px solid var(--border-color);
      padding: 6px;
      background: #ffffff;
      border-radius: var(--radius-sm);
    }

    .qr-wrap img {
      width: 100%;
      height: auto;
      display: block;
    }

    /* 文章列表与资讯 */
    .article-link-box {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .article-item {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 14px 18px;
      background: #ffffff;
      border: 2px solid var(--border-color);
      border-radius: var(--radius-sm);
      box-shadow: 2px 2px 0px var(--border-color);
      font-weight: 700;
      font-size: 14px;
      transition: background 0.15s, transform 0.15s;
    }

    .article-item:hover {
      background: #fefce8;
      transform: translateX(4px);
    }

    /* 友情链接与页脚统一规范 */
    .footer-section {
      background: #0f172a;
      color: #ffffff;
      border-top: 3px solid #000000;
      padding: 48px 0 24px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 30px;
      margin-bottom: 36px;
    }

    .footer-col h4 {
      color: #ffffff;
      font-size: 15px;
      font-weight: 800;
      margin-bottom: 14px;
      border-left: 3px solid var(--color-accent-yellow);
      padding-left: 8px;
    }

    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
      font-size: 13px;
      color: #cbd5e1;
    }

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

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

    .friendship-links a {
      font-size: 12px;
      color: #94a3b8;
      background: #1e293b;
      padding: 4px 10px;
      border-radius: 4px;
      border: 1px solid #334155;
    }

    .friendship-links a:hover {
      color: #ffffff;
      border-color: var(--color-accent-yellow);
    }

    .footer-bottom {
      border-top: 1px solid #334155;
      padding-top: 20px;
      text-align: center;
      font-size: 13px;
      color: #94a3b8;
    }

    /* 浮动客服 */
    .float-service {
      position: fixed;
      right: 20px;
      bottom: 24px;
      z-index: 99;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      background: var(--color-accent-yellow);
      border: 2px solid var(--border-color);
      border-radius: 50%;
      box-shadow: 2px 2px 0px var(--border-color);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      cursor: pointer;
      font-weight: 900;
    }

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

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        border-bottom: 2px solid var(--border-color);
        padding: 16px;
      }
      .nav-links.show {
        display: flex;
      }
      .nav-toggle {
        display: block;
      }
      .hero-title {
        font-size: 26px;
      }
      .grid-3, .grid-4, .grid-2, .steps-wrapper {
        grid-template-columns: 1fr;
      }
      .form-grid {
        grid-template-columns: 1fr;
      }
      .form-group-full {
        grid-column: span 1;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }