:root {
      --primary: #ff007a;
      --secondary: #7928ca;
      --accent: #00d2ff;
      --electric: #ff5e00;
      --neon-green: #10b981;
      --bg-page: #fafbfe;
      --bg-surface: #ffffff;
      --bg-soft: #f4f5fb;
      --text-main: #111827;
      --text-muted: #4b5563;
      --text-sub: #6b7280;
      --border-color: #e5e7eb;
      --border-vibrant: #fed7e2;
      --container-max: 1200px;
      --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.05);
      --shadow-lg: 0 16px 36px rgba(121, 40, 202, 0.12);
      --transition: all 0.25s ease;
    }

    * {
      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-page);
      color: var(--text-main);
      line-height: 1.6;
      background-image: 
        radial-gradient(at 0% 0%, rgba(255, 0, 122, 0.04) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(0, 210, 255, 0.04) 0px, transparent 50%);
      background-attachment: fixed;
    }

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

    .container {
      width: 100%;
      max-width: var(--container-max);
      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, 0.94);
      backdrop-filter: blur(12px);
      border-bottom: 2px solid transparent;
      border-image: linear-gradient(90deg, var(--primary), var(--secondary), var(--accent)) 1;
    }

    .nav-wrap {
      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: 42px;
      width: auto;
      display: block;
    }

    .brand-name {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
    }

    .nav-links a {
      padding: 8px 12px;
      font-size: 0.92rem;
      font-weight: 600;
      color: var(--text-muted);
      border-radius: 6px;
      white-space: nowrap;
    }

    .nav-links a:hover {
      color: var(--primary);
      background: rgba(255, 0, 122, 0.06);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.95rem;
      font-weight: 700;
      border-radius: 8px;
      cursor: pointer;
      transition: var(--transition);
      border: 1px solid transparent;
      text-align: center;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(255, 0, 122, 0.3);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(255, 0, 122, 0.45);
      color: #ffffff;
    }

    .btn-accent {
      background: linear-gradient(135deg, var(--electric), var(--primary));
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(255, 94, 0, 0.3);
    }

    .btn-accent:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(255, 94, 0, 0.45);
      color: #ffffff;
    }

    .btn-outline {
      background: #ffffff;
      border-color: var(--border-color);
      color: var(--text-main);
    }

    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: rgba(255, 0, 122, 0.04);
    }

    .nav-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      cursor: pointer;
      color: var(--text-main);
      padding: 4px;
    }

    /* 首屏 Hero（严禁出现图片） */
    .hero-section {
      padding: 80px 0 60px;
      position: relative;
      overflow: hidden;
      background: linear-gradient(180deg, rgba(255, 0, 122, 0.03) 0%, rgba(121, 40, 202, 0.04) 100%);
      border-bottom: 1px solid var(--border-color);
    }

    .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;
      padding: 6px 14px;
      background: #ffffff;
      border: 1px solid var(--primary);
      color: var(--primary);
      font-size: 0.82rem;
      font-weight: 700;
      border-radius: 999px;
      margin-bottom: 20px;
      box-shadow: 0 2px 8px rgba(255, 0, 122, 0.1);
    }

    .hero-title {
      font-size: 2.5rem;
      line-height: 1.25;
      font-weight: 900;
      color: var(--text-main);
      margin-bottom: 18px;
      letter-spacing: -0.5px;
    }

    .hero-desc {
      font-size: 1.1rem;
      color: var(--text-muted);
      margin-bottom: 30px;
      line-height: 1.7;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      align-items: center;
      margin-bottom: 32px;
    }

    .hero-tagline {
      display: flex;
      gap: 20px;
      font-size: 0.88rem;
      color: var(--text-sub);
      font-weight: 600;
    }

    .hero-tagline span {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      color: var(--text-main);
    }

    .hero-tagline span::before {
      content: "✓";
      color: var(--neon-green);
      font-weight: 900;
    }

    .hero-panel {
      background: #ffffff;
      border: 2px solid var(--border-vibrant);
      border-radius: 20px;
      padding: 30px;
      box-shadow: var(--shadow-lg);
      position: relative;
    }

    .panel-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      border-bottom: 1px dashed var(--border-color);
      padding-bottom: 15px;
      margin-bottom: 20px;
    }

    .panel-status {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--neon-green);
    }

    .status-dot {
      width: 10px;
      height: 10px;
      background: var(--neon-green);
      border-radius: 50%;
      box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.2);
    }

    .panel-metric-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      margin-bottom: 20px;
    }

    .metric-card {
      background: var(--bg-soft);
      padding: 16px;
      border-radius: 12px;
      border-left: 4px solid var(--primary);
    }

    .metric-card:nth-child(2) {
      border-left-color: var(--secondary);
    }

    .metric-card:nth-child(3) {
      border-left-color: var(--accent);
    }

    .metric-card:nth-child(4) {
      border-left-color: var(--electric);
    }

    .metric-num {
      font-size: 1.5rem;
      font-weight: 900;
      color: var(--text-main);
      display: block;
    }

    .metric-label {
      font-size: 0.8rem;
      color: var(--text-sub);
      font-weight: 600;
    }

    .panel-chip-list {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }

    .chip {
      background: rgba(121, 40, 202, 0.08);
      color: var(--secondary);
      font-size: 0.78rem;
      font-weight: 700;
      padding: 4px 10px;
      border-radius: 6px;
      border: 1px solid rgba(121, 40, 202, 0.15);
    }

    /* Section 通用规范 */
    .section-wrap {
      padding: 70px 0;
      border-bottom: 1px solid var(--border-color);
    }

    .section-header {
      text-align: center;
      max-width: 750px;
      margin: 0 auto 50px;
    }

    .section-tag {
      display: inline-block;
      font-size: 0.8rem;
      font-weight: 800;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: var(--primary);
      background: rgba(255, 0, 122, 0.08);
      padding: 4px 12px;
      border-radius: 6px;
      margin-bottom: 12px;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 12px;
      letter-spacing: -0.5px;
    }

    .section-desc {
      font-size: 0.98rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

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

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

    .card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: 16px;
      padding: 24px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      height: 100%;
    }

    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: var(--primary);
    }

    .card-icon-box {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      font-size: 1.2rem;
      margin-bottom: 16px;
      background: linear-gradient(135deg, rgba(255, 0, 122, 0.12), rgba(121, 40, 202, 0.12));
      color: var(--primary);
      border: 1px solid rgba(255, 0, 122, 0.2);
    }

    .card-title {
      font-size: 1.18rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }

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

    /* 平台介绍 & 图文展区 */
    .split-box {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }

    .media-container {
      border-radius: 16px;
      overflow: hidden;
      border: 2px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      background: #ffffff;
      padding: 8px;
    }

    .media-container img {
      width: 100%;
      height: auto;
      display: block;
      border-radius: 12px;
      object-fit: cover;
    }

    .feature-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 14px;
      margin-top: 20px;
    }

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

    .feature-badge {
      background: var(--neon-green);
      color: #ffffff;
      border-radius: 50%;
      width: 22px;
      height: 22px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.75rem;
      font-weight: 900;
      flex-shrink: 0;
      margin-top: 2px;
    }

    .feature-info h4 {
      font-size: 0.98rem;
      font-weight: 700;
      color: var(--text-main);
    }

    .feature-info p {
      font-size: 0.88rem;
      color: var(--text-sub);
    }

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

    .step-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 16px;
      padding: 24px;
      position: relative;
      border-top: 4px solid var(--secondary);
    }

    .step-num {
      font-size: 2rem;
      font-weight: 900;
      color: rgba(121, 40, 202, 0.2);
      line-height: 1;
      margin-bottom: 12px;
    }

    /* 对比表格 */
    .compare-wrap {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 16px;
      overflow-x: auto;
      box-shadow: var(--shadow-sm);
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 680px;
    }

    .compare-table th, .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.92rem;
    }

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

    .compare-table td.highlight {
      background: rgba(255, 0, 122, 0.03);
      color: var(--primary);
      font-weight: 700;
    }

    .rating-banner {
      background: linear-gradient(90deg, #ff007a, #7928ca);
      color: #ffffff;
      padding: 20px 24px;
      border-radius: 12px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 24px;
      flex-wrap: wrap;
      gap: 16px;
    }

    .rating-score {
      font-size: 1.6rem;
      font-weight: 900;
    }

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

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 12px;
      overflow: hidden;
      transition: var(--transition);
    }

    .faq-question {
      padding: 18px 22px;
      font-size: 1.02rem;
      font-weight: 700;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #ffffff;
      user-select: none;
    }

    .faq-icon {
      font-size: 1.2rem;
      transition: transform 0.25s ease;
      color: var(--primary);
      font-weight: 800;
    }

    .faq-answer {
      display: none;
      padding: 0 22px 18px;
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.65;
      border-top: 1px dashed var(--border-color);
      padding-top: 14px;
    }

    .faq-item.active {
      border-color: var(--primary);
      box-shadow: 0 4px 16px rgba(255, 0, 122, 0.08);
    }

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

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

    /* 用户评论 */
    .review-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 16px;
      padding: 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      box-shadow: var(--shadow-sm);
    }

    .review-stars {
      color: #ff9900;
      margin-bottom: 12px;
      font-size: 0.95rem;
    }

    .review-text {
      font-size: 0.9rem;
      color: var(--text-muted);
      margin-bottom: 16px;
      line-height: 1.6;
    }

    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid var(--border-color);
      padding-top: 14px;
    }

    .review-avatar {
      width: 40px;
      height: 40px;
      background: linear-gradient(135deg, var(--secondary), var(--accent));
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.9rem;
    }

    .author-info h5 {
      font-size: 0.92rem;
      font-weight: 700;
      color: var(--text-main);
    }

    .author-info span {
      font-size: 0.78rem;
      color: var(--text-sub);
    }

    /* 表单区域 */
    .form-wrapper {
      background: #ffffff;
      border: 2px solid var(--border-vibrant);
      border-radius: 20px;
      padding: 36px;
      box-shadow: var(--shadow-lg);
      max-width: 800px;
      margin: 0 auto;
    }

    .form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 18px;
      margin-bottom: 18px;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

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

    .form-label {
      font-size: 0.88rem;
      font-weight: 700;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 0.92rem;
      color: var(--text-main);
      background: var(--bg-soft);
      outline: none;
      transition: var(--transition);
      font-family: inherit;
    }

    .form-control:focus {
      border-color: var(--primary);
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(255, 0, 122, 0.15);
    }

    /* 文章列表 & 友情链接 */
    .article-links-box {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 14px;
    }

    .article-tag {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 6px 14px;
      border-radius: 8px;
      font-size: 0.85rem;
      color: var(--text-muted);
      font-weight: 600;
    }

    .article-tag:hover {
      border-color: var(--secondary);
      color: var(--secondary);
    }

    /* 底部通用 Footer */
    .site-footer {
      background: #ffffff;
      border-top: 2px solid var(--border-color);
      padding: 50px 0 24px;
      color: var(--text-muted);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 30px;
      margin-bottom: 40px;
    }

    .footer-title {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 14px;
    }

    .footer-links-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .footer-links-list a {
      color: var(--text-sub);
      font-size: 0.88rem;
    }

    .footer-links-list a:hover {
      color: var(--primary);
    }

    .qrcode-box {
      display: flex;
      align-items: center;
      gap: 14px;
      margin-top: 10px;
    }

    .qrcode-box img {
      width: 88px;
      height: 88px;
      border-radius: 8px;
      border: 1px solid var(--border-color);
    }

    .footer-bottom {
      border-top: 1px solid var(--border-color);
      padding-top: 20px;
      text-align: center;
      font-size: 0.82rem;
      color: var(--text-sub);
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
    }

    .friend-links-row {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      font-size: 0.85rem;
      align-items: center;
    }

    .friend-links-row a {
      color: var(--text-sub);
    }

    .friend-links-row a:hover {
      color: var(--primary);
    }

    /* 浮动工具栏 */
    .floating-bar {
      position: fixed;
      right: 20px;
      bottom: 30px;
      display: flex;
      flex-direction: column;
      gap: 10px;
      z-index: 999;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      background: #ffffff;
      border: 2px solid var(--primary);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.1rem;
      cursor: pointer;
      box-shadow: var(--shadow-sm);
      color: var(--primary);
      transition: var(--transition);
    }

    .float-btn:hover {
      background: var(--primary);
      color: #ffffff;
      transform: scale(1.08);
    }

    /* 响应式媒体查询 */
    @media (max-width: 992px) {
      .hero-grid, .split-box {
        grid-template-columns: 1fr;
      }
      .grid-3, .review-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-4, .step-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .nav-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 16px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-lg);
      }
      .nav-links.show {
        display: flex;
      }
      .nav-links a {
        width: 100%;
        padding: 10px 14px;
      }
      .nav-cta {
        display: none;
      }
    }

    @media (max-width: 640px) {
      .hero-title {
        font-size: 1.85rem;
      }
      .grid-3, .grid-4, .step-grid, .review-grid {
        grid-template-columns: 1fr;
      }
      .form-grid {
        grid-template-columns: 1fr;
      }
      .form-group.full {
        grid-column: span 1;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        text-align: center;
      }
    }