:root {
      --primary: #4F46E5;
      --primary-dark: #3730A3;
      --accent-pop: #FF5722;
      --accent-neon: #06B6D4;
      --accent-sun: #F59E0B;
      --bg-light: #F8FAFC;
      --bg-card: #FFFFFF;
      --text-main: #0F172A;
      --text-muted: #475569;
      --border-color: #E2E8F0;
      --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.04);
      --shadow-md: 0 10px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
      --shadow-pop: 5px 5px 0px #0F172A;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
    }

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

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
    }

    .ai-container {
      width: 100%;
      max-width: 1200px;
      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, 0.96);
      backdrop-filter: blur(12px);
      border-bottom: 2px solid var(--text-main);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
    }

    .brand-box {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
    }

    .brand-box .ai-page-logo {
      height: 42px;
      width: auto;
      display: block;
    }

    .brand-text {
      font-size: 1.35rem;
      font-weight: 900;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }

    .brand-tag {
      background: var(--accent-pop);
      color: #FFF;
      font-size: 0.75rem;
      font-weight: 700;
      padding: 2px 8px;
      border-radius: 4px;
      border: 1px solid var(--text-main);
    }

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

    .nav-links li a {
      display: block;
      padding: 8px 14px;
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
      text-decoration: none;
      transition: all 0.2s ease;
      border-radius: var(--radius-sm);
    }

    .nav-links li a:hover {
      background: #EEF2FF;
      color: var(--primary);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 0.95rem;
      padding: 10px 22px;
      border-radius: var(--radius-sm);
      text-decoration: none;
      transition: all 0.2s ease;
      cursor: pointer;
      border: 2px solid var(--text-main);
    }

    .btn-pop {
      background: var(--accent-pop);
      color: #FFFFFF;
      box-shadow: 3px 3px 0px var(--text-main);
    }

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

    .btn-primary {
      background: var(--primary);
      color: #FFFFFF;
      box-shadow: 3px 3px 0px var(--text-main);
    }

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

    .btn-outline {
      background: #FFFFFF;
      color: var(--text-main);
      box-shadow: 3px 3px 0px var(--text-main);
    }

    .btn-outline:hover {
      background: #F1F5F9;
      transform: translate(-2px, -2px);
      box-shadow: 5px 5px 0px var(--text-main);
    }

    .menu-toggle {
      display: none;
      background: none;
      border: 2px solid var(--text-main);
      border-radius: 6px;
      padding: 6px 10px;
      cursor: pointer;
      font-weight: 900;
    }

    /* 首屏 HERO 纯CSS无图片设计 */
    .hero-section {
      background: linear-gradient(135deg, #F0F4FF 0%, #FFF5F2 50%, #ECFEFF 100%);
      border-bottom: 2px solid var(--text-main);
      padding: 70px 0 60px;
      position: relative;
    }

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

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #FFE4E6;
      color: #BE123C;
      border: 1.5px solid var(--text-main);
      border-radius: 30px;
      padding: 6px 16px;
      font-weight: 800;
      font-size: 0.88rem;
      margin-bottom: 20px;
      box-shadow: 2px 2px 0px var(--text-main);
    }

    .hero-title {
      font-size: 2.8rem;
      font-weight: 900;
      line-height: 1.2;
      color: var(--text-main);
      margin-bottom: 18px;
      letter-spacing: -1px;
    }

    .hero-title .highlight {
      background: linear-gradient(180deg, transparent 65%, #FDE047 65%);
      padding: 0 4px;
    }

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      margin-bottom: 30px;
      line-height: 1.7;
    }

    .hero-btns {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 36px;
    }

    .hero-features-list {
      display: flex;
      flex-wrap: wrap;
      gap: 20px;
      font-size: 0.92rem;
      font-weight: 700;
      color: var(--text-main);
    }

    .hero-features-list span {
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .hero-features-list span::before {
      content: "✔";
      color: #10B981;
      font-weight: 900;
    }

    /* 首屏右侧纯CSS交互面板 */
    .hero-visual-card {
      background: #FFFFFF;
      border: 2px solid var(--text-main);
      border-radius: var(--radius-lg);
      padding: 24px;
      box-shadow: 8px 8px 0px var(--text-main);
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

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

    .status-dot {
      display: inline-block;
      width: 10px;
      height: 10px;
      background: #10B981;
      border-radius: 50%;
      box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
    }

    .model-tags-box {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }

    .model-chip {
      background: #F1F5F9;
      border: 1px solid var(--text-main);
      padding: 4px 10px;
      border-radius: 6px;
      font-size: 0.8rem;
      font-weight: 800;
      color: var(--text-main);
    }

    .model-chip.hot {
      background: #FEF3C7;
      color: #92400E;
    }

    .model-chip.speed {
      background: #E0E7FF;
      color: #3730A3;
    }

    .hero-stats-row {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 10px;
      background: #F8FAFC;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      padding: 12px;
      text-align: center;
    }

    .hero-stat-item .num {
      font-size: 1.4rem;
      font-weight: 900;
      color: var(--primary);
    }

    .hero-stat-item .lbl {
      font-size: 0.75rem;
      font-weight: 700;
      color: var(--text-muted);
    }

    /* 通用版块样式 */
    .section-py {
      padding: 80px 0;
      border-bottom: 2px solid var(--text-main);
    }

    .section-head {
      text-align: center;
      max-width: 780px;
      margin: 0 auto 50px;
    }

    .section-tag {
      display: inline-block;
      background: var(--accent-neon);
      color: #083344;
      font-size: 0.82rem;
      font-weight: 900;
      text-transform: uppercase;
      padding: 4px 12px;
      border-radius: 4px;
      border: 1.5px solid var(--text-main);
      margin-bottom: 12px;
      box-shadow: 2px 2px 0px var(--text-main);
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 900;
      color: var(--text-main);
      letter-spacing: -0.5px;
      margin-bottom: 12px;
    }

    .section-subtitle {
      font-size: 1.05rem;
      color: var(--text-muted);
    }

    /* 服务矩阵网格 */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
      gap: 20px;
    }

    .service-card {
      background: var(--bg-card);
      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;
      justify-content: space-between;
    }

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

    .card-icon {
      font-size: 2rem;
      margin-bottom: 14px;
      display: inline-block;
    }

    .card-title {
      font-size: 1.25rem;
      font-weight: 900;
      color: var(--text-main);
      margin-bottom: 10px;
    }

    .card-desc {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
      flex-grow: 1;
    }

    .card-tag-row {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
    }

    .card-tag {
      background: #F1F5F9;
      font-size: 0.75rem;
      font-weight: 700;
      color: var(--text-main);
      padding: 2px 8px;
      border-radius: 4px;
      border: 1px solid var(--border-color);
    }

    /* 平台介绍分栏 */
    .intro-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }

    .intro-text-block {
      background: #FFFFFF;
      border: 2px solid var(--text-main);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: 6px 6px 0px var(--text-main);
    }

    .intro-points {
      margin-top: 24px;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .intro-point-item {
      display: flex;
      align-items: flex-start;
      gap: 12px;
    }

    .point-badge {
      background: var(--accent-pop);
      color: #FFF;
      font-weight: 900;
      font-size: 0.85rem;
      width: 24px;
      height: 24px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
      border: 1px solid var(--text-main);
    }

    /* 流程步骤 */
    .steps-container {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
      gap: 16px;
    }

    .step-box {
      background: #FFFFFF;
      border: 2px solid var(--text-main);
      border-radius: var(--radius-md);
      padding: 22px;
      box-shadow: 4px 4px 0px var(--text-main);
      position: relative;
    }

    .step-num {
      position: absolute;
      top: -12px;
      right: 14px;
      background: var(--accent-sun);
      color: var(--text-main);
      font-weight: 900;
      font-size: 0.88rem;
      padding: 2px 10px;
      border-radius: 20px;
      border: 1.5px solid var(--text-main);
    }

    .step-title {
      font-size: 1.15rem;
      font-weight: 900;
      margin: 10px 0 8px;
    }

    .step-desc {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    /* 案例展示 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 24px;
    }

    .case-card {
      background: #FFFFFF;
      border: 2px solid var(--text-main);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: 5px 5px 0px var(--text-main);
    }

    .case-img-wrap {
      width: 100%;
      aspect-ratio: 16 / 9;
      background: #E2E8F0;
      overflow: hidden;
      border-bottom: 2px solid var(--text-main);
    }

    .case-img-wrap.square-ratio {
      aspect-ratio: 1 / 1;
    }

    .case-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: transform 0.3s ease;
    }

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

    .case-content {
      padding: 20px;
    }

    .case-cat {
      font-size: 0.78rem;
      font-weight: 800;
      color: var(--primary);
      text-transform: uppercase;
      margin-bottom: 6px;
    }

    .case-title {
      font-size: 1.2rem;
      font-weight: 900;
      margin-bottom: 8px;
    }

    .case-desc {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* 对比评测板块 */
    .eval-container {
      background: #FFFFFF;
      border: 2px solid var(--text-main);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: 8px 8px 0px var(--text-main);
    }

    .eval-score-header {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
      background: #FEF9C3;
      border: 2px solid var(--text-main);
      border-radius: var(--radius-md);
      padding: 20px 24px;
      margin-bottom: 30px;
    }

    .score-badge-group {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .star-rank {
      font-size: 1.4rem;
      font-weight: 900;
      color: #D97706;
      letter-spacing: 2px;
    }

    .score-number {
      font-size: 2.2rem;
      font-weight: 900;
      color: var(--text-main);
    }

    .table-responsive {
      width: 100%;
      overflow-x: auto;
    }

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

    .compare-table th, .compare-table td {
      padding: 16px 20px;
      border-bottom: 1.5px solid var(--border-color);
      font-size: 0.95rem;
    }

    .compare-table th {
      background: #F8FAFC;
      font-weight: 900;
      color: var(--text-main);
      border-top: 2px solid var(--text-main);
    }

    .compare-table tr:hover td {
      background: #F1F5F9;
    }

    .feature-name {
      font-weight: 800;
      color: var(--text-main);
    }

    .badge-highlight {
      background: #DCFCE7;
      color: #15803D;
      font-weight: 800;
      padding: 4px 10px;
      border-radius: 6px;
      border: 1px solid #16A34A;
      display: inline-block;
    }

    /* 需求匹配与表单 */
    .form-section-bg {
      background: #EEF2FF;
    }

    .form-wrapper {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 40px;
      background: #FFFFFF;
      border: 2px solid var(--text-main);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: 8px 8px 0px var(--text-main);
    }

    .form-side-info {
      background: #1E1B4B;
      color: #FFFFFF;
      padding: 40px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .side-info-title {
      font-size: 1.8rem;
      font-weight: 900;
      color: #FACC15;
      margin-bottom: 16px;
    }

    .contact-item-row {
      margin-top: 24px;
      display: flex;
      flex-direction: column;
      gap: 14px;
      font-size: 0.95rem;
    }

    .qr-box {
      margin-top: 20px;
      background: #FFFFFF;
      padding: 10px;
      border-radius: var(--radius-sm);
      width: 130px;
      border: 2px solid var(--text-main);
    }

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

    .form-main-box {
      padding: 40px;
    }

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

    .form-label {
      display: block;
      font-size: 0.92rem;
      font-weight: 800;
      margin-bottom: 6px;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      font-size: 0.95rem;
      border: 2px solid var(--border-color);
      border-radius: var(--radius-sm);
      background: #F8FAFC;
      color: var(--text-main);
      transition: all 0.2s ease;
      font-family: inherit;
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      background: #FFFFFF;
      box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
    }

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

    /* 用户评论卡片 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 20px;
    }

    .review-card {
      background: #FFFFFF;
      border: 2px solid var(--text-main);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: 4px 4px 0px var(--text-main);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }

    .user-avatar-tag {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--accent-neon);
      border: 1.5px solid var(--text-main);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      font-size: 1.1rem;
      color: #083344;
    }

    .user-name {
      font-size: 1rem;
      font-weight: 900;
      color: var(--text-main);
    }

    .user-role {
      font-size: 0.8rem;
      color: var(--text-muted);
      font-weight: 700;
    }

    .review-text {
      font-size: 0.92rem;
      color: var(--text-main);
      line-height: 1.6;
    }

    /* FAQ 折叠面板 */
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .faq-item {
      background: #FFFFFF;
      border: 2px solid var(--text-main);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: 3px 3px 0px var(--text-main);
    }

    .faq-question {
      padding: 18px 24px;
      font-size: 1.05rem;
      font-weight: 900;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #FFFFFF;
      user-select: none;
      transition: background 0.2s ease;
    }

    .faq-question:hover {
      background: #F8FAFC;
    }

    .faq-arrow {
      font-size: 1.1rem;
      transition: transform 0.2s ease;
    }

    .faq-item.active .faq-arrow {
      transform: rotate(180deg);
    }

    .faq-answer {
      display: none;
      padding: 0 24px 20px;
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.7;
      border-top: 1px dashed var(--border-color);
      margin-top: 8px;
      padding-top: 14px;
    }

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

    /* 资讯与百科 */
    .articles-box {
      background: #FFFFFF;
      border: 2px solid var(--text-main);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: 4px 4px 0px var(--text-main);
    }

    .articles-list {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 16px;
    }

    .article-chip {
      background: #F1F5F9;
      border: 1px solid var(--text-main);
      padding: 8px 14px;
      border-radius: var(--radius-sm);
      text-decoration: none;
      color: var(--text-main);
      font-size: 0.88rem;
      font-weight: 700;
      transition: all 0.2s ease;
    }

    .article-chip:hover {
      background: var(--accent-sun);
      color: #000;
    }

    /* 友情链接与页脚 */
    .site-footer {
      background: #0F172A;
      color: #E2E8F0;
      padding: 60px 0 30px;
      border-top: 3px solid var(--accent-pop);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.4fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }

    .footer-title {
      font-size: 1.1rem;
      font-weight: 900;
      color: #FFFFFF;
      margin-bottom: 16px;
      border-left: 4px solid var(--accent-neon);
      padding-left: 10px;
    }

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

    .footer-links-list a {
      color: #94A3B8;
      text-decoration: none;
      font-size: 0.9rem;
      transition: color 0.2s;
    }

    .footer-links-list a:hover {
      color: #38BDF8;
    }

    .friend-links-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }

    .friend-links-wrap a {
      color: #94A3B8;
      text-decoration: none;
      font-size: 0.85rem;
      background: #1E293B;
      padding: 4px 10px;
      border-radius: 4px;
      border: 1px solid #334155;
      transition: all 0.2s;
    }

    .friend-links-wrap a:hover {
      background: var(--primary);
      color: #FFFFFF;
    }

    .footer-bottom {
      border-top: 1px solid #334155;
      padding-top: 24px;
      text-align: center;
      font-size: 0.85rem;
      color: #64748B;
    }

    /* 悬浮组件 */
    .floating-kefu {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      background: #FFFFFF;
      border: 2px solid var(--text-main);
      border-radius: 50px;
      padding: 10px 18px;
      box-shadow: 4px 4px 0px var(--text-main);
      display: flex;
      align-items: center;
      gap: 10px;
      text-decoration: none;
      color: var(--text-main);
      font-weight: 800;
      font-size: 0.9rem;
      transition: all 0.2s;
    }

    .floating-kefu:hover {
      transform: translateY(-3px);
      box-shadow: 6px 6px 0px var(--text-main);
      background: #FEF3C7;
    }

    /* 响应式适配 */
    @media (max-width: 992px) {
      .hero-grid, .intro-grid, .form-wrapper, .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero-title {
        font-size: 2.2rem;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 76px;
        left: 0;
        width: 100%;
        background: #FFFFFF;
        flex-direction: column;
        padding: 20px;
        border-bottom: 2px solid var(--text-main);
      }
      .nav-links.show {
        display: flex;
      }
      .menu-toggle {
        display: block;
      }
    }

    @media (max-width: 640px) {
      .hero-title {
        font-size: 1.8rem;
      }
      .section-py {
        padding: 50px 0;
      }
      .form-side-info, .form-main-box {
        padding: 24px;
      }
      .eval-container {
        padding: 20px;
      }
    }