:root {
      --bg-main: #0a0e1a;
      --bg-card: rgba(16, 24, 48, 0.85);
      --bg-card-hover: rgba(22, 34, 66, 0.95);
      --neon-cyan: #00f0ff;
      --neon-pink: #ff007f;
      --neon-purple: #9d4edd;
      --neon-blue: #0077ff;
      --text-main: #f8fafc;
      --text-muted: #94a3b8;
      --border-color: rgba(0, 240, 255, 0.25);
      --border-glow: rgba(0, 240, 255, 0.5);
      --max-width: 1200px;
      --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

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

    body {
      background-color: var(--bg-main);
      color: var(--text-main);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      line-height: 1.6;
      overflow-x: hidden;
      position: relative;
    }

    body::before {
      content: "";
      position: fixed;
      top: 0;
      left: 0;
      width: 100vw;
      height: 100vh;
      background: radial-gradient(circle at 20% 20%, rgba(0, 240, 255, 0.08) 0%, transparent 40%),
                  radial-gradient(circle at 80% 80%, rgba(255, 0, 127, 0.08) 0%, transparent 40%),
                  radial-gradient(circle at 50% 50%, rgba(157, 78, 221, 0.05) 0%, transparent 60%);
      pointer-events: none;
      z-index: -1;
    }

    .container {
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(10, 14, 26, 0.9);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
    }

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

    .brand-area {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .brand-area .ai-page-logo {
      height: 40px;
      width: auto;
      display: block;
    }

    .brand-title {
      font-size: 1.25rem;
      font-weight: 700;
      letter-spacing: 0.5px;
      color: #ffffff;
      text-shadow: 0 0 10px rgba(0, 240, 255, 0.6);
    }

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

    .nav-links li a {
      padding: 8px 12px;
      font-size: 0.92rem;
      color: var(--text-muted);
      border-radius: 4px;
      display: block;
    }

    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--neon-cyan);
      text-shadow: 0 0 8px var(--neon-cyan);
    }

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

    .btn-neon {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 20px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: 6px;
      cursor: pointer;
      transition: var(--transition);
      border: 1px solid transparent;
      text-align: center;
    }

    .btn-neon-cyan {
      background: linear-gradient(135deg, #00f0ff, #0077ff);
      color: #050b14;
      box-shadow: 0 0 15px rgba(0, 240, 255, 0.4);
    }

    .btn-neon-cyan:hover {
      background: linear-gradient(135deg, #33f3ff, #1a85ff);
      box-shadow: 0 0 25px rgba(0, 240, 255, 0.7);
      transform: translateY(-2px);
      color: #000;
    }

    .btn-neon-outline {
      border: 1px solid var(--neon-pink);
      color: #ffffff;
      background: rgba(255, 0, 127, 0.05);
      box-shadow: 0 0 10px rgba(255, 0, 127, 0.2);
    }

    .btn-neon-outline:hover {
      background: rgba(255, 0, 127, 0.2);
      box-shadow: 0 0 20px rgba(255, 0, 127, 0.5);
      transform: translateY(-2px);
    }

    .mobile-menu-toggle {
      display: none;
      background: transparent;
      border: none;
      color: var(--text-main);
      font-size: 1.5rem;
      cursor: pointer;
    }

    /* Hero 首屏 */
    .hero-section {
      padding: 90px 0 60px;
      position: relative;
      text-align: center;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      background: rgba(0, 240, 255, 0.1);
      border: 1px solid var(--neon-cyan);
      border-radius: 999px;
      color: var(--neon-cyan);
      font-size: 0.85rem;
      font-weight: 600;
      margin-bottom: 24px;
      box-shadow: 0 0 12px rgba(0, 240, 255, 0.3);
    }

    .hero-title {
      font-size: 2.75rem;
      line-height: 1.25;
      font-weight: 800;
      margin-bottom: 20px;
      color: #ffffff;
      text-shadow: 0 0 20px rgba(0, 240, 255, 0.4);
    }

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 800px;
      margin: 0 auto 36px;
      line-height: 1.7;
    }

    .hero-cta-group {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 50px;
    }

    .hero-cta-group .btn-neon {
      padding: 14px 32px;
      font-size: 1.05rem;
    }

    .hero-stats-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 24px;
      box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    }

    .stat-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 4px;
    }

    .stat-value {
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--neon-cyan);
      text-shadow: 0 0 10px rgba(0, 240, 255, 0.5);
    }

    .stat-label {
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    /* Section 通用规范 */
    .section-block {
      padding: 60px 0;
      position: relative;
    }

    .section-header {
      text-align: center;
      margin-bottom: 44px;
    }

    .section-tag {
      font-size: 0.8rem;
      font-weight: 700;
      letter-spacing: 2px;
      text-transform: uppercase;
      color: var(--neon-pink);
      margin-bottom: 8px;
      display: block;
      text-shadow: 0 0 8px rgba(255, 0, 127, 0.4);
    }

    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: #ffffff;
      margin-bottom: 12px;
    }

    .section-subtitle {
      font-size: 1rem;
      color: var(--text-muted);
      max-width: 640px;
      margin: 0 auto;
    }

    /* 卡片式网格 */
    .grid-cards {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
      gap: 20px;
    }

    .neon-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 10px;
      padding: 24px;
      transition: var(--transition);
      position: relative;
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }

    .neon-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background: linear-gradient(90deg, transparent, var(--neon-cyan), transparent);
      opacity: 0;
      transition: var(--transition);
    }

    .neon-card:hover {
      transform: translateY(-4px);
      border-color: var(--neon-cyan);
      box-shadow: 0 8px 24px rgba(0, 240, 255, 0.2);
    }

    .neon-card:hover::before {
      opacity: 1;
    }

    .card-icon {
      width: 44px;
      height: 44px;
      border-radius: 8px;
      background: rgba(0, 240, 255, 0.1);
      border: 1px solid var(--neon-cyan);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 16px;
      color: var(--neon-cyan);
      font-size: 1.25rem;
      font-weight: bold;
    }

    .card-title {
      font-size: 1.2rem;
      font-weight: 600;
      margin-bottom: 10px;
      color: #ffffff;
    }

    .card-desc {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    /* 平台介绍 */
    .about-box {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 36px;
      box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    }

    .about-p {
      font-size: 1.05rem;
      line-height: 1.8;
      color: var(--text-muted);
      margin-bottom: 24px;
    }

    .models-tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 20px;
    }

    .model-tag {
      background: rgba(157, 78, 221, 0.15);
      border: 1px solid var(--neon-purple);
      color: #e2d9f3;
      padding: 6px 14px;
      border-radius: 6px;
      font-size: 0.85rem;
      transition: var(--transition);
    }

    .model-tag:hover {
      background: rgba(157, 78, 221, 0.4);
      color: #ffffff;
      box-shadow: 0 0 10px var(--neon-purple);
    }

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

    .step-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 10px;
      padding: 24px;
      text-align: center;
      position: relative;
    }

    .step-num {
      width: 36px;
      height: 36px;
      background: var(--neon-pink);
      color: #ffffff;
      font-weight: bold;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
      box-shadow: 0 0 12px var(--neon-pink);
    }

    /* 对比表格 */
    .table-container {
      width: 100%;
      overflow-x: auto;
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 10px;
    }

    .eval-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.95rem;
    }

    .eval-table th,
    .eval-table td {
      padding: 16px 20px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }

    .eval-table th {
      background: rgba(0, 0, 0, 0.3);
      color: var(--neon-cyan);
      font-weight: 600;
    }

    .eval-table td.highlight {
      color: var(--neon-cyan);
      font-weight: 600;
      background: rgba(0, 240, 255, 0.03);
    }

    .score-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 14px;
      background: rgba(255, 0, 127, 0.15);
      border: 1px solid var(--neon-pink);
      color: #ffffff;
      font-weight: bold;
      border-radius: 6px;
    }

    /* 案例展示 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .case-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 10px;
      overflow: hidden;
    }

    .case-media {
      position: relative;
      aspect-ratio: 16 / 9;
      background: #000;
      overflow: hidden;
    }

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

    .case-media img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: var(--transition);
    }

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

    .case-info {
      padding: 20px;
    }

    .case-tag {
      font-size: 0.75rem;
      color: var(--neon-cyan);
      text-transform: uppercase;
      margin-bottom: 6px;
      display: block;
    }

    .case-name {
      font-size: 1.15rem;
      font-weight: 600;
      margin-bottom: 8px;
      color: #ffffff;
    }

    .case-desc {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 评论卡片 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .review-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 10px;
      padding: 20px;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

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

    .reviewer-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--neon-cyan), var(--neon-purple));
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      color: #ffffff;
    }

    .reviewer-role {
      font-size: 0.8rem;
      color: var(--neon-cyan);
    }

    .review-content {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* FAQ 手风琴 */
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
      max-width: 860px;
      margin: 0 auto;
    }

    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 8px;
      overflow: hidden;
      transition: var(--transition);
    }

    .faq-question {
      padding: 18px 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
      font-size: 1.02rem;
      font-weight: 600;
      color: #ffffff;
      user-select: none;
    }

    .faq-toggle-icon {
      font-size: 1.2rem;
      color: var(--neon-cyan);
      transition: var(--transition);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
      background: rgba(0, 0, 0, 0.2);
    }

    .faq-answer-inner {
      padding: 0 24px 18px;
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    .faq-item.active .faq-toggle-icon {
      transform: rotate(45deg);
      color: var(--neon-pink);
    }

    /* 表单区域 */
    .form-container {
      max-width: 720px;
      margin: 0 auto;
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 36px;
      box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    }

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

    .form-label {
      display: block;
      margin-bottom: 8px;
      font-size: 0.9rem;
      font-weight: 500;
      color: #ffffff;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      background: rgba(5, 10, 20, 0.8);
      border: 1px solid rgba(255, 255, 255, 0.15);
      border-radius: 6px;
      color: #ffffff;
      font-size: 0.95rem;
      transition: var(--transition);
    }

    .form-control:focus {
      outline: none;
      border-color: var(--neon-cyan);
      box-shadow: 0 0 10px rgba(0, 240, 255, 0.3);
    }

    /* 文章推荐 */
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
      gap: 16px;
    }

    .article-item {
      padding: 16px;
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 8px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .article-item:hover {
      border-color: var(--neon-cyan);
      transform: translateY(-2px);
    }

    .article-link {
      font-size: 0.92rem;
      color: #ffffff;
      line-height: 1.5;
    }

    .article-link:hover {
      color: var(--neon-cyan);
    }

    /* 页脚与底部 */
    .site-footer {
      background: #050811;
      border-top: 1px solid rgba(0, 240, 255, 0.2);
      padding: 48px 0 24px;
      font-size: 0.9rem;
      color: #64748b;
    }

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

    .footer-col h4 {
      color: #ffffff;
      font-size: 1rem;
      margin-bottom: 16px;
      font-weight: 600;
    }

    .footer-col p {
      margin-bottom: 8px;
      line-height: 1.6;
    }

    .footer-links {
      list-style: none;
    }

    .footer-links li {
      margin-bottom: 8px;
    }

    .footer-links li a:hover {
      color: var(--neon-cyan);
    }

    .qrcode-box {
      display: inline-block;
      padding: 8px;
      background: #ffffff;
      border-radius: 6px;
      margin-top: 8px;
    }

    .qrcode-box img {
      width: 100px;
      height: 100px;
      display: block;
    }

    .friend-links-box {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding: 20px 0;
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      align-items: center;
      font-size: 0.85rem;
    }

    .friend-links-box a {
      color: #94a3b8;
    }

    .friend-links-box a:hover {
      color: var(--neon-cyan);
    }

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 24px;
      text-align: center;
      font-size: 0.82rem;
    }

    /* 悬浮客服 */
    .float-toolbar {
      position: fixed;
      right: 24px;
      bottom: 40px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .float-item {
      width: 48px;
      height: 48px;
      background: var(--bg-card);
      border: 1px solid var(--neon-cyan);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--neon-cyan);
      box-shadow: 0 0 12px rgba(0, 240, 255, 0.4);
      cursor: pointer;
      position: relative;
      transition: var(--transition);
    }

    .float-item:hover {
      background: var(--neon-cyan);
      color: #050b14;
      box-shadow: 0 0 20px rgba(0, 240, 255, 0.8);
    }

    .float-qr-pop {
      position: absolute;
      right: 58px;
      bottom: 0;
      background: #ffffff;
      padding: 10px;
      border-radius: 8px;
      box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
      display: none;
    }

    .float-qr-pop img {
      width: 120px;
      height: 120px;
      display: block;
    }

    .float-item:hover .float-qr-pop {
      display: block;
    }

    /* 响应式样式适配 */
    @media (max-width: 992px) {
      .hero-title {
        font-size: 2.2rem;
      }
      .hero-stats-bar {
        grid-template-columns: repeat(2, 1fr);
      }
      .workflow-steps {
        grid-template-columns: repeat(2, 1fr);
      }
      .case-grid,
      .reviews-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-content {
        grid-template-columns: repeat(2, 1fr);
      }
      .nav-links {
        display: none;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .nav-links.mobile-open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #0a0e1a;
        border-bottom: 1px solid var(--border-color);
        padding: 16px 24px;
        gap: 8px;
      }
    }

    @media (max-width: 640px) {
      .hero-title {
        font-size: 1.75rem;
      }
      .hero-stats-bar {
        grid-template-columns: 1fr;
      }
      .workflow-steps {
        grid-template-columns: 1fr;
      }
      .case-grid,
      .reviews-grid {
        grid-template-columns: 1fr;
      }
      .footer-content {
        grid-template-columns: 1fr;
      }
      .site-header .btn-neon {
        display: none;
      }
    }