:root {
      --primary: #4F46E5;
      --primary-dark: #3730A3;
      --accent-coral: #FF4D4D;
      --accent-yellow: #FFB800;
      --accent-cyan: #06B6D4;
      --accent-lime: #10B981;
      --bg-page: #F8FAFC;
      --bg-surface: #FFFFFF;
      --text-main: #0F172A;
      --text-muted: #475569;
      --text-light: #64748B;
      --border-color: #E2E8F0;
      --border-highlight: #CBD5E1;
      --shadow-sm: 0 2px 4px rgba(15, 23, 42, 0.04);
      --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.08);
      --shadow-lg: 0 16px 32px rgba(15, 23, 42, 0.12);
      --shadow-pop: 4px 4px 0px #0F172A;
      --radius: 12px;
      --radius-sm: 8px;
      --radius-lg: 20px;
      --container-max: 1200px;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

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

    ul, ol {
      list-style: none;
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      font-size: 1rem;
      font-weight: 700;
      border-radius: var(--radius-sm);
      cursor: pointer;
      transition: transform 0.15s ease, box-shadow 0.15s ease;
      text-align: center;
      border: 2px solid var(--text-main);
    }

    .btn:active {
      transform: translate(2px, 2px);
      box-shadow: none !important;
    }

    .btn-primary {
      background-color: var(--primary);
      color: #FFFFFF;
      box-shadow: 4px 4px 0px var(--text-main);
    }
    .btn-primary:hover {
      background-color: var(--primary-dark);
      box-shadow: 6px 6px 0px var(--text-main);
    }

    .btn-accent {
      background-color: var(--accent-yellow);
      color: var(--text-main);
      box-shadow: 4px 4px 0px var(--text-main);
    }
    .btn-accent:hover {
      background-color: #f59e0b;
      box-shadow: 6px 6px 0px var(--text-main);
    }

    .btn-coral {
      background-color: var(--accent-coral);
      color: #FFFFFF;
      box-shadow: 4px 4px 0px var(--text-main);
    }
    .btn-coral:hover {
      background-color: #E03131;
      box-shadow: 6px 6px 0px var(--text-main);
    }

    .btn-outline {
      background-color: #FFFFFF;
      color: var(--text-main);
      box-shadow: 4px 4px 0px var(--text-main);
    }
    .btn-outline:hover {
      background-color: #F1F5F9;
      box-shadow: 6px 6px 0px var(--text-main);
    }

    .badge {
      display: inline-block;
      padding: 4px 12px;
      font-size: 0.825rem;
      font-weight: 700;
      border-radius: 20px;
      border: 1.5px solid var(--text-main);
      box-shadow: 2px 2px 0px var(--text-main);
      margin-bottom: 12px;
    }
    .badge-yellow { background-color: var(--accent-yellow); color: var(--text-main); }
    .badge-cyan { background-color: var(--accent-cyan); color: var(--text-main); }
    .badge-coral { background-color: var(--accent-coral); color: #FFF; }
    .badge-lime { background-color: var(--accent-lime); color: #FFF; }

    .section-header {
      text-align: center;
      margin-bottom: 48px;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.5px;
      margin-bottom: 12px;
    }
    .section-subtitle {
      font-size: 1.05rem;
      color: var(--text-muted);
      max-width: 680px;
      margin-left: auto;
      margin-right: auto;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background-color: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(10px);
      border-bottom: 2px solid var(--border-color);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-box {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .brand-box .ai-page-logo {
      height: 40px;
      width: auto;
      display: block;
    }
    .brand-name {
      font-size: 1.25rem;
      font-weight: 900;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
    }
    .nav-links a {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-main);
      padding: 8px 12px;
      border-radius: var(--radius-sm);
    }
    .nav-links a:hover {
      color: var(--primary);
      background-color: #EEF2FF;
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: 2px solid var(--text-main);
      border-radius: var(--radius-sm);
      padding: 6px 10px;
      cursor: pointer;
      font-weight: bold;
    }

    /* 首屏 Hero */
    .hero-section {
      padding: 70px 0 60px;
      background: linear-gradient(135deg, #EEF2FF 0%, #FAF5FF 50%, #FFFBEB 100%);
      border-bottom: 2px solid var(--text-main);
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 40px;
      align-items: center;
    }
    .hero-content h1 {
      font-size: 2.35rem;
      line-height: 1.25;
      font-weight: 900;
      color: var(--text-main);
      margin-bottom: 20px;
    }
    .hero-content p {
      font-size: 1.15rem;
      color: var(--text-muted);
      margin-bottom: 30px;
      line-height: 1.6;
    }
    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 32px;
    }
    .hero-stats-row {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .hero-stat-item {
      background-color: #FFFFFF;
      border: 2px solid var(--text-main);
      box-shadow: 3px 3px 0px var(--text-main);
      padding: 10px 18px;
      border-radius: var(--radius-sm);
    }
    .hero-stat-item .stat-num {
      font-size: 1.35rem;
      font-weight: 900;
      color: var(--primary);
      display: block;
    }
    .hero-stat-item .stat-label {
      font-size: 0.825rem;
      color: var(--text-muted);
      font-weight: 600;
    }

    /* 首屏右侧纯CSS创意面板 */
    .hero-card-board {
      background-color: #FFFFFF;
      border: 3px solid var(--text-main);
      border-radius: var(--radius);
      box-shadow: 8px 8px 0px var(--text-main);
      padding: 24px;
      position: relative;
    }
    .board-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding-bottom: 16px;
      margin-bottom: 16px;
      border-bottom: 2px dashed var(--border-color);
    }
    .board-title {
      font-weight: 800;
      font-size: 1.1rem;
      color: var(--text-main);
    }
    .board-badge {
      background-color: var(--accent-lime);
      color: #FFF;
      font-size: 0.75rem;
      font-weight: 700;
      padding: 2px 8px;
      border-radius: 4px;
    }
    .engine-stack {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 12px;
      margin-bottom: 16px;
    }
    .engine-pill {
      background-color: #F8FAFC;
      border: 1.5px solid var(--border-color);
      padding: 10px;
      border-radius: var(--radius-sm);
      display: flex;
      flex-direction: column;
      gap: 4px;
      transition: all 0.2s ease;
    }
    .engine-pill:hover {
      border-color: var(--text-main);
      box-shadow: 2px 2px 0px var(--text-main);
      background-color: #EEF2FF;
    }
    .engine-name {
      font-weight: 700;
      font-size: 0.9rem;
      color: var(--text-main);
    }
    .engine-desc {
      font-size: 0.75rem;
      color: var(--text-light);
    }
    .board-footer {
      background: linear-gradient(90deg, #FEF3C7, #E0E7FF);
      border: 1.5px solid var(--text-main);
      padding: 12px;
      border-radius: var(--radius-sm);
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--text-main);
      text-align: center;
    }

    /* 区域通用卡片样式 */
    .section-py {
      padding: 80px 0;
      border-bottom: 2px solid var(--border-color);
    }
    .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: 32px;
    }

    .card-box {
      background-color: #FFFFFF;
      border: 2px solid var(--text-main);
      border-radius: var(--radius);
      box-shadow: 4px 4px 0px var(--text-main);
      padding: 24px;
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }
    .card-box:hover {
      transform: translateY(-4px);
      box-shadow: 6px 6px 0px var(--text-main);
    }
    .card-box h3 {
      font-size: 1.25rem;
      font-weight: 800;
      margin-bottom: 10px;
      color: var(--text-main);
    }
    .card-box p {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 支持模型标签云 */
    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 24px;
    }
    .tag-item {
      background-color: #FFFFFF;
      border: 1.5px solid var(--text-main);
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 0.875rem;
      font-weight: 700;
      color: var(--text-main);
      box-shadow: 2px 2px 0px var(--border-highlight);
    }

    /* 对比评测表格与卡片 */
    .review-summary-card {
      background: linear-gradient(135deg, #FFFBEB, #EEF2FF);
      border: 2px solid var(--text-main);
      border-radius: var(--radius);
      box-shadow: 6px 6px 0px var(--text-main);
      padding: 32px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 24px;
      margin-bottom: 32px;
    }
    .score-badge {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .score-big {
      font-size: 3.5rem;
      font-weight: 900;
      color: var(--primary);
      line-height: 1;
    }
    .score-stars {
      color: var(--accent-yellow);
      font-size: 1.5rem;
    }
    .compare-table-wrapper {
      overflow-x: auto;
      background-color: #FFFFFF;
      border: 2px solid var(--text-main);
      border-radius: var(--radius);
      box-shadow: 4px 4px 0px var(--text-main);
    }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }
    .compare-table th, .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.95rem;
    }
    .compare-table th {
      background-color: #F8FAFC;
      font-weight: 800;
      color: var(--text-main);
      border-bottom: 2px solid var(--text-main);
    }
    .compare-table tr:hover {
      background-color: #F1F5F9;
    }
    .col-highlight {
      background-color: #EEF2FF;
      font-weight: 700;
      color: var(--primary);
    }

    /* 标准流程时间线 */
    .process-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .process-step {
      background-color: #FFFFFF;
      border: 2px solid var(--text-main);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: 4px 4px 0px var(--text-main);
      position: relative;
    }
    .step-number {
      font-size: 2.25rem;
      font-weight: 900;
      color: var(--accent-coral);
      margin-bottom: 12px;
      line-height: 1;
    }

    /* 图文案例展示 */
    .case-gallery-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .case-img-card {
      background-color: #FFFFFF;
      border: 2px solid var(--text-main);
      border-radius: var(--radius);
      box-shadow: 4px 4px 0px var(--text-main);
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }
    .case-img-wrap {
      width: 100%;
      aspect-ratio: 16 / 9;
      background-color: #E2E8F0;
      overflow: hidden;
      border-bottom: 2px solid var(--text-main);
    }
    .case-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: transform 0.3s ease;
    }
    .case-img-card:hover .case-img-wrap img {
      transform: scale(1.03);
    }
    .case-info {
      padding: 20px;
    }

    /* 客户评论卡片 */
    .testimonial-card {
      background-color: #FFFFFF;
      border: 2px solid var(--text-main);
      border-radius: var(--radius);
      box-shadow: 4px 4px 0px var(--text-main);
      padding: 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .user-meta {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 20px;
      padding-top: 16px;
      border-top: 1px dashed var(--border-color);
    }
    .user-avatar-tag {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background-color: var(--accent-yellow);
      border: 2px solid var(--text-main);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 1rem;
    }
    .user-info-text .user-name {
      font-weight: 800;
      font-size: 0.95rem;
      color: var(--text-main);
    }
    .user-info-text .user-role {
      font-size: 0.8rem;
      color: var(--text-light);
    }

    /* FAQ 折叠手风琴 */
    .faq-list {
      max-width: 880px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .faq-item {
      background-color: #FFFFFF;
      border: 2px solid var(--text-main);
      border-radius: var(--radius-sm);
      box-shadow: 3px 3px 0px var(--text-main);
      overflow: hidden;
    }
    .faq-question {
      padding: 18px 24px;
      font-size: 1.05rem;
      font-weight: 700;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
      background-color: #FFFFFF;
      transition: background-color 0.2s ease;
    }
    .faq-question:hover {
      background-color: #EEF2FF;
    }
    .faq-icon {
      font-weight: 900;
      font-size: 1.25rem;
      transition: transform 0.2s ease;
    }
    .faq-answer {
      display: none;
      padding: 0 24px 20px;
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.6;
      border-top: 1px dashed var(--border-color);
      padding-top: 14px;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* 需求匹配与表单 */
    .form-container {
      max-width: 760px;
      margin: 0 auto;
      background-color: #FFFFFF;
      border: 3px solid var(--text-main);
      border-radius: var(--radius);
      box-shadow: 8px 8px 0px var(--text-main);
      padding: 36px;
    }
    .form-group {
      margin-bottom: 20px;
    }
    .form-label {
      display: block;
      font-weight: 700;
      font-size: 0.95rem;
      margin-bottom: 8px;
      color: var(--text-main);
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 2px solid var(--text-main);
      border-radius: var(--radius-sm);
      font-size: 1rem;
      background-color: #F8FAFC;
      color: var(--text-main);
      outline: none;
      font-family: inherit;
    }
    .form-control:focus {
      border-color: var(--primary);
      background-color: #FFFFFF;
      box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
    }
    textarea.form-control {
      resize: vertical;
      min-height: 120px;
    }

    /* 最新文章与资讯 */
    .article-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
      margin-top: 20px;
    }
    .article-item-link {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 14px 20px;
      background-color: #FFFFFF;
      border: 2px solid var(--text-main);
      border-radius: var(--radius-sm);
      box-shadow: 2px 2px 0px var(--text-main);
      font-weight: 600;
    }
    .article-item-link:hover {
      background-color: #EEF2FF;
      transform: translateX(4px);
    }

    /* 微信客服与联系 */
    .contact-box-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      align-items: center;
    }
    .kefu-qr-wrap {
      text-align: center;
      background-color: #FFFFFF;
      border: 2px solid var(--text-main);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: 4px 4px 0px var(--text-main);
      max-width: 320px;
      margin: 0 auto;
    }
    .kefu-qr-wrap img {
      width: 200px;
      height: 200px;
      object-fit: contain;
      display: block;
      margin: 0 auto 16px;
      border: 1px solid var(--border-color);
    }

    /* 友情链接与页脚 */
    .site-footer {
      background-color: #0F172A;
      color: #F8FAFC;
      border-top: 3px solid var(--text-main);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      color: #FFFFFF;
      font-size: 1.1rem;
      font-weight: 800;
      margin-bottom: 20px;
      position: relative;
    }
    .footer-links-list li {
      margin-bottom: 10px;
    }
    .footer-links-list a {
      color: #94A3B8;
      font-size: 0.9rem;
    }
    .footer-links-list a:hover {
      color: #FFFFFF;
      text-decoration: underline;
    }
    .friend-links-wrap {
      padding-top: 24px;
      border-top: 1px solid #334155;
      margin-bottom: 24px;
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      align-items: center;
    }
    .friend-links-wrap span {
      font-weight: 700;
      color: #CBD5E1;
    }
    .friend-links-wrap a {
      color: #94A3B8;
      font-size: 0.9rem;
    }
    .friend-links-wrap a:hover {
      color: #38BDF8;
    }
    .footer-bottom {
      text-align: center;
      padding-top: 24px;
      border-top: 1px solid #1E293B;
      color: #64748B;
      font-size: 0.85rem;
    }

    /* 悬浮客服挂件 */
    .floating-kefu {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 99;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .float-btn {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background-color: var(--primary);
      color: #FFFFFF;
      border: 2px solid var(--text-main);
      box-shadow: 3px 3px 0px var(--text-main);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.25rem;
      cursor: pointer;
      transition: all 0.2s ease;
    }
    .float-btn:hover {
      transform: scale(1.08);
      background-color: var(--accent-coral);
    }
    .back-to-top {
      display: none;
      background-color: #FFFFFF;
      color: var(--text-main);
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      .hero-grid, .grid-3, .grid-4, .case-gallery-grid, .footer-grid, .contact-box-grid {
        grid-template-columns: 1fr;
      }
      .process-grid {
        grid-template-columns: repeat(2, 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-color: #FFFFFF;
        border-bottom: 2px solid var(--text-main);
        padding: 20px;
        box-shadow: var(--shadow-lg);
      }
    }

    @media (max-width: 640px) {
      .hero-content h1 {
        font-size: 1.75rem;
      }
      .process-grid, .grid-2 {
        grid-template-columns: 1fr;
      }
      .section-py {
        padding: 50px 0;
      }
    }