:root {
      --primary: #6366f1;
      --primary-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #ec4899 100%);
      --holo-glow: radial-gradient(circle at 50% 50%, rgba(99, 102, 241, 0.15), rgba(236, 72, 153, 0.08), transparent 70%);
      --bg-body: #f8fafc;
      --bg-surface: #ffffff;
      --bg-surface-glass: rgba(255, 255, 255, 0.85);
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --border-color: #e2e8f0;
      --border-holo: linear-gradient(135deg, #6366f1, #ec4899);
      --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.04);
      --shadow-md: 0 8px 24px rgba(99, 102, 241, 0.08);
      --shadow-lg: 0 16px 36px rgba(99, 102, 241, 0.12);
      --radius: 14px;
    }

    * {
      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-body);
      color: var(--text-main);
      line-height: 1.6;
    }

    body {
      background: var(--bg-body);
      background-image: 
        radial-gradient(at 0% 0%, rgba(99, 102, 241, 0.05) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(236, 72, 153, 0.05) 0px, transparent 50%);
      background-attachment: fixed;
      overflow-x: hidden;
    }

    a {
      color: var(--primary);
      text-decoration: none;
      transition: all 0.25s ease;
    }

    a:hover {
      opacity: 0.85;
    }

    /* 容器规范 */
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
      width: 100%;
    }

    /* 头部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: var(--bg-surface-glass);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(226, 232, 240, 0.8);
      transition: all 0.3s ease;
    }

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

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

    .ai-page-logo {
      height: 38px;
      width: auto;
      object-fit: contain;
    }

    .brand-title {
      font-size: 1.25rem;
      font-weight: 700;
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .nav-links {
      display: flex;
      list-style: none;
      margin: 0;
      padding: 0;
      gap: 0; /* 必须显式写明 gap: 0 */
      align-items: center;
    }

    .nav-links li a, .ai-page-home-link {
      display: inline-block;
      padding: 8px 14px;
      font-size: 0.95rem;
      color: var(--text-muted);
      font-weight: 500;
      border-radius: 8px;
    }

    .nav-links li a:hover, .ai-page-home-link:hover {
      color: var(--primary);
      background: rgba(99, 102, 241, 0.06);
    }

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

    .btn-holo {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.95rem;
      font-weight: 600;
      color: #ffffff;
      background: var(--primary-gradient);
      border: none;
      border-radius: 30px;
      box-shadow: 0 4px 14px rgba(99, 102, 241, 0.3);
      cursor: pointer;
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }

    .btn-holo:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
      color: #ffffff;
    }

    .btn-outline {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 9px 20px;
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-main);
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 30px;
      cursor: pointer;
      transition: all 0.2s ease;
    }

    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: rgba(99, 102, 241, 0.04);
    }

    /* 移动端菜单切换 */
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
    }

    /* 首屏 HERO 区域 - 严格不出现图片 */
    .hero-section {
      padding: 80px 0 60px;
      position: relative;
      text-align: center;
      overflow: hidden;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      border-radius: 30px;
      background: rgba(255, 255, 255, 0.9);
      border: 1px solid rgba(99, 102, 241, 0.25);
      box-shadow: var(--shadow-sm);
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 24px;
    }

    .hero-badge span {
      display: inline-block;
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: #10b981;
      box-shadow: 0 0 8px #10b981;
    }

    .hero-title {
      font-size: 2.5rem;
      font-weight: 800;
      letter-spacing: -0.02em;
      line-height: 1.25;
      margin-bottom: 20px;
      color: var(--text-main);
    }

    .hero-title-highlight {
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      max-width: 820px;
      margin: 0 auto 36px;
      font-size: 1.125rem;
      color: var(--text-muted);
      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: 20px;
      margin-top: 20px;
    }

    .metric-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px 16px;
      box-shadow: var(--shadow-sm);
      position: relative;
      transition: transform 0.25s ease, border-color 0.25s ease;
    }

    .metric-card:hover {
      transform: translateY(-4px);
      border-color: rgba(99, 102, 241, 0.4);
      box-shadow: var(--shadow-md);
    }

    .metric-num {
      font-size: 1.85rem;
      font-weight: 800;
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      margin-bottom: 6px;
    }

    .metric-label {
      font-size: 0.9rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 通用 Section 基础规范 */
    .section {
      padding: 70px 0;
      position: relative;
    }

    .section-header {
      text-align: center;
      max-width: 750px;
      margin: 0 auto 48px;
    }

    .section-tag {
      font-size: 0.85rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.1em;
      color: var(--primary);
      margin-bottom: 10px;
      display: block;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
    }

    .section-subtitle {
      font-size: 1.025rem;
      color: var(--text-muted);
    }

    /* 关于我们 / 平台介绍 */
    .about-card {
      background: #ffffff;
      border-radius: 18px;
      border: 1px solid var(--border-color);
      padding: 40px;
      box-shadow: var(--shadow-md);
      position: relative;
      overflow: hidden;
    }

    .about-card::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 4px;
      background: var(--primary-gradient);
    }

    .model-chips {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 24px;
    }

    .chip {
      background: rgba(99, 102, 241, 0.08);
      color: var(--primary);
      border: 1px solid rgba(99, 102, 241, 0.15);
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 0.88rem;
      font-weight: 600;
    }

    /* AIGC 服务卡片网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .service-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 28px 24px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .service-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-lg);
      border-color: rgba(99, 102, 241, 0.3);
    }

    .service-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: rgba(99, 102, 241, 0.1);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      font-weight: 700;
      margin-bottom: 20px;
    }

    .service-title {
      font-size: 1.2rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }

    .service-desc {
      font-size: 0.93rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
    }

    .service-tag {
      font-size: 0.8rem;
      color: #8b5cf6;
      font-weight: 600;
      background: rgba(139, 92, 246, 0.08);
      padding: 4px 10px;
      border-radius: 6px;
      align-self: flex-start;
    }

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

    .step-item {
      background: #ffffff;
      padding: 30px 20px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      text-align: center;
      box-shadow: var(--shadow-sm);
    }

    .step-num {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--primary-gradient);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      margin: 0 auto 16px;
    }

    .step-title {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

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

    /* 案例展示区 (含非首屏图片) */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .case-card {
      background: #ffffff;
      border-radius: var(--radius);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }

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

    .case-img-box {
      width: 100%;
      height: 200px;
      overflow: hidden;
      background: #f1f5f9;
    }

    .case-img-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }

    .case-card:hover .case-img-box img {
      transform: scale(1.05);
    }

    .case-content {
      padding: 20px;
    }

    .case-title {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

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

    /* 对比评测 */
    .review-score-banner {
      background: linear-gradient(135deg, rgba(99, 102, 241, 0.08) 0%, rgba(236, 72, 153, 0.08) 100%);
      border: 1px solid rgba(99, 102, 241, 0.2);
      border-radius: var(--radius);
      padding: 30px;
      text-align: center;
      margin-bottom: 30px;
    }

    .stars {
      color: #f59e0b;
      font-size: 1.5rem;
      margin-bottom: 8px;
    }

    .score-title {
      font-size: 1.4rem;
      font-weight: 800;
      color: var(--text-main);
    }

    .table-container {
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

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

    .compare-table th, .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
    }

    .compare-table th {
      background: #f8fafc;
      font-weight: 700;
      color: var(--text-main);
    }

    .compare-table td.highlight {
      background: rgba(99, 102, 241, 0.04);
      font-weight: 700;
      color: var(--primary);
    }

    /* 需求匹配器 */
    .match-wizard {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 18px;
      padding: 36px;
      box-shadow: var(--shadow-md);
    }

    .wizard-group {
      margin-bottom: 24px;
    }

    .wizard-label {
      font-weight: 700;
      margin-bottom: 12px;
      display: block;
    }

    .wizard-options {
      display: flex;
      gap: 12px;
      flex-wrap: wrap;
    }

    .wizard-btn {
      padding: 10px 20px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      background: #ffffff;
      cursor: pointer;
      font-size: 0.9rem;
      transition: all 0.2s ease;
    }

    .wizard-btn.active {
      border-color: var(--primary);
      background: rgba(99, 102, 241, 0.08);
      color: var(--primary);
      font-weight: 600;
    }

    /* 评论卡片 Grid */
    .testimonial-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

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

    .avatar-placeholder {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--primary-gradient);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
    }

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

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
      transition: border-color 0.2s ease;
    }

    .faq-item.active {
      border-color: var(--primary);
    }

    .faq-question {
      padding: 20px 24px;
      font-weight: 700;
      font-size: 1.05rem;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      user-select: none;
    }

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

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

    .faq-toggle {
      font-size: 1.2rem;
      transition: transform 0.3s ease;
    }

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

    /* 文章列表 */
    .article-links-box {
      background: #ffffff;
      border-radius: var(--radius);
      padding: 24px;
      border: 1px solid var(--border-color);
    }

    .article-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .article-list li a {
      color: var(--text-main);
      font-weight: 500;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }

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

    /* 表单与联系区 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 18px;
      padding: 40px;
      box-shadow: var(--shadow-md);
    }

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

    .form-label {
      display: block;
      font-weight: 600;
      margin-bottom: 8px;
      font-size: 0.92rem;
    }

    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 0.95rem;
      background: var(--bg-body);
      color: var(--text-main);
      outline: none;
      transition: border-color 0.2s ease;
    }

    .form-input:focus, .form-select:focus, .form-textarea:focus {
      border-color: var(--primary);
      background: #ffffff;
    }

    .contact-info-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
      margin-top: 20px;
    }

    .contact-info-item {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 0.95rem;
    }

    .qr-box {
      margin-top: 20px;
      padding: 16px;
      background: #f8fafc;
      border-radius: 12px;
      display: inline-block;
      text-align: center;
      border: 1px solid var(--border-color);
    }

    .qr-box img {
      width: 140px;
      height: 140px;
      object-fit: contain;
      border-radius: 8px;
    }

    /* Footer 规范对齐 */
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px;
      margin-top: 60px;
      border-top: 1px solid #1e293b;
    }

    .footer-inner {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 2fr;
      gap: 36px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      color: #ffffff;
      font-size: 1.05rem;
      margin-bottom: 20px;
    }

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

    .footer-links a {
      color: #94a3b8;
      font-size: 0.9rem;
    }

    .footer-links a:hover {
      color: #ffffff;
    }

    .friend-links-flex {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }

    .friend-links-flex a {
      color: #94a3b8;
      font-size: 0.88rem;
      background: #1e293b;
      padding: 4px 10px;
      border-radius: 6px;
    }

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

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      text-align: center;
      font-size: 0.88rem;
    }

    /* 浮动组件 */
    .float-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: #ffffff;
      box-shadow: 0 6px 20px rgba(0,0,0,0.15);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-weight: 700;
      cursor: pointer;
      transition: transform 0.2s ease;
      border: 1px solid var(--border-color);
    }

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

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

    @media (max-width: 768px) {
      .hero-title { font-size: 1.8rem; }
      .nav-links { display: none; }
      .mobile-menu-btn { display: block; }
      .grid-3, .grid-4, .cases-grid, .steps-wrapper, .hero-metrics { grid-template-columns: 1fr; }
      .footer-inner { grid-template-columns: 1fr; }
      .nav-links.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        padding: 20px;
        box-shadow: var(--shadow-md);
        border-bottom: 1px solid var(--border-color);
      }
    }