:root {
      --primary: #ff3366;
      --primary-hover: #e02456;
      --secondary: #6366f1;
      --accent: #00f2fe;
      --accent-warm: #ff9900;
      --dark: #0f172a;
      --text: #1e293b;
      --text-muted: #64748b;
      --bg-page: #f8faff;
      --bg-card: #ffffff;
      --border: #e2e8f0;
      --radius: 12px;
      --shadow: 0 10px 25px -5px rgba(255, 51, 102, 0.08), 0 8px 10px -6px rgba(99, 102, 241, 0.05);
      --shadow-hover: 0 20px 35px -10px rgba(255, 51, 102, 0.18), 0 10px 15px -5px rgba(99, 102, 241, 0.1);
    }

    * {
      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-page);
      color: var(--text);
    }

    body {
      line-height: 1.6;
      overflow-x: hidden;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.25s ease;
    }

    .container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border);
    }

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

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

    .ai-page-logo {
      height: 40px;
      width: auto;
      object-fit: contain;
    }

    .brand-name {
      font-size: 20px;
      font-weight: 800;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

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

    .nav-links a {
      padding: 8px 14px;
      font-size: 14px;
      font-weight: 600;
      color: var(--text);
      border-radius: 6px;
    }

    .nav-links a:hover {
      color: var(--primary);
      background: rgba(255, 51, 102, 0.05);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 24px;
      font-size: 15px;
      font-weight: 700;
      border-radius: 30px;
      cursor: pointer;
      border: none;
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary), #ff6b8b);
      color: #ffffff;
      box-shadow: 0 4px 15px rgba(255, 51, 102, 0.35);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(255, 51, 102, 0.5);
      color: #ffffff;
    }

    .btn-outline {
      background: #ffffff;
      color: var(--primary);
      border: 2px solid var(--primary);
    }

    .btn-outline:hover {
      background: var(--primary);
      color: #ffffff;
      transform: translateY(-2px);
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--dark);
    }

    /* Hero 首屏 */
    .hero-section {
      padding: 90px 0 70px;
      position: relative;
      background: radial-gradient(circle at 10% 20%, rgba(255, 51, 102, 0.08) 0%, transparent 40%),
                  radial-gradient(circle at 90% 80%, rgba(99, 102, 241, 0.08) 0%, transparent 40%);
      text-align: center;
    }

    .hero-badge {
      display: inline-block;
      padding: 6px 18px;
      background: rgba(255, 51, 102, 0.1);
      color: var(--primary);
      border-radius: 20px;
      font-size: 13px;
      font-weight: 700;
      margin-bottom: 20px;
      border: 1px solid rgba(255, 51, 102, 0.2);
    }

    .hero-title {
      font-size: 42px;
      font-weight: 900;
      line-height: 1.25;
      color: var(--dark);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-subtitle {
      font-size: 18px;
      color: var(--text-muted);
      max-width: 820px;
      margin: 0 auto 36px;
    }

    .hero-actions {
      display: flex;
      justify-content: center;
      gap: 16px;
      margin-bottom: 48px;
      flex-wrap: wrap;
    }

    .hero-stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      max-width: 1000px;
      margin: 0 auto;
    }

    .stat-card {
      background: #ffffff;
      padding: 24px 16px;
      border-radius: var(--radius);
      border: 1px solid var(--border);
      box-shadow: var(--shadow);
      transition: transform 0.3s ease;
    }

    .stat-card:hover {
      transform: translateY(-4px);
    }

    .stat-value {
      font-size: 32px;
      font-weight: 900;
      color: var(--primary);
      line-height: 1.1;
      margin-bottom: 6px;
    }

    .stat-label {
      font-size: 13px;
      color: var(--text-muted);
      font-weight: 600;
    }

    /* 通用章节规范 */
    .section-wrap {
      padding: 80px 0;
      border-bottom: 1px solid rgba(226, 232, 240, 0.6);
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 50px;
    }

    .section-tag {
      font-size: 13px;
      font-weight: 800;
      text-transform: uppercase;
      color: var(--primary);
      letter-spacing: 1px;
      display: block;
      margin-bottom: 8px;
    }

    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--dark);
      margin-bottom: 14px;
    }

    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
    }

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

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

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

    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(255, 51, 102, 0.3);
    }

    .feature-card h3 {
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--dark);
    }

    .feature-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    .feature-tag {
      display: inline-block;
      align-self: flex-start;
      margin-top: 16px;
      padding: 4px 10px;
      border-radius: 6px;
      font-size: 12px;
      font-weight: 600;
      background: #fff0f3;
      color: var(--primary);
    }

    /* 平台支持标签云 */
    .model-pills {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 30px;
    }

    .model-pill {
      background: #ffffff;
      border: 1px solid var(--border);
      padding: 8px 16px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      color: var(--text);
      box-shadow: 0 2px 5px rgba(0,0,0,0.03);
      transition: all 0.2s ease;
    }

    .model-pill:hover {
      background: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
      transform: scale(1.05);
    }

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

    .step-box {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius);
      border: 1px solid var(--border);
      position: relative;
    }

    .step-num {
      width: 36px;
      height: 36px;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      color: #fff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      margin-bottom: 16px;
    }

    .step-box h4 {
      font-size: 17px;
      color: var(--dark);
      margin-bottom: 8px;
    }

    .step-box p {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 对比评测表格 */
    .review-highlight {
      background: linear-gradient(135deg, #fff0f3, #f5f3ff);
      border: 2px solid var(--primary);
      border-radius: var(--radius);
      padding: 30px;
      margin-bottom: 40px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 20px;
    }

    .review-score {
      display: flex;
      align-items: baseline;
      gap: 10px;
    }

    .score-big {
      font-size: 48px;
      font-weight: 900;
      color: var(--primary);
    }

    .score-stars {
      color: #ffb800;
      font-size: 20px;
      font-weight: 700;
    }

    .table-responsive {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border);
      box-shadow: var(--shadow);
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 600px;
    }

    .compare-table th, .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border);
      font-size: 14px;
    }

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

    .compare-table tr:hover td {
      background: #fff8f9;
    }

    .highlight-col {
      color: var(--primary);
      font-weight: 700;
    }

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

    .showcase-item {
      background: #ffffff;
      border-radius: var(--radius);
      overflow: hidden;
      border: 1px solid var(--border);
      box-shadow: var(--shadow);
    }

    .showcase-img-wrap {
      width: 100%;
      aspect-ratio: 16/9;
      background: #f1f5f9;
      overflow: hidden;
    }

    .showcase-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: transform 0.4s ease;
    }

    .showcase-item:hover .showcase-img-wrap img {
      transform: scale(1.05);
    }

    .showcase-content {
      padding: 20px;
    }

    .showcase-content h4 {
      font-size: 17px;
      color: var(--dark);
      margin-bottom: 8px;
    }

    .showcase-content p {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 用户评论 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

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

    .testimonial-text {
      font-size: 14px;
      color: var(--text);
      line-height: 1.7;
      margin-bottom: 20px;
      position: relative;
    }

    .testimonial-user {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px dashed var(--border);
      padding-top: 16px;
    }

    .avatar-placeholder {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 15px;
    }

    .user-info h5 {
      font-size: 14px;
      color: var(--dark);
    }

    .user-info span {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* 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);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: 0 2px 6px rgba(0,0,0,0.02);
    }

    .faq-question {
      padding: 18px 24px;
      font-size: 16px;
      font-weight: 700;
      color: var(--dark);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #ffffff;
      user-select: none;
    }

    .faq-question:hover {
      color: var(--primary);
    }

    .faq-icon {
      font-size: 18px;
      transition: transform 0.3s ease;
      color: var(--primary);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
      background: #fafcff;
      border-top: 1px solid transparent;
    }

    .faq-item.active .faq-answer {
      max-height: 400px;
      border-top-color: var(--border);
      transition: max-height 0.4s ease-in-out;
    }

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

    .faq-answer-inner {
      padding: 18px 24px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 表单与联系模块 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 40px;
      background: #ffffff;
      border-radius: 20px;
      border: 1px solid var(--border);
      box-shadow: var(--shadow-hover);
      padding: 40px;
    }

    .contact-info h3 {
      font-size: 24px;
      color: var(--dark);
      margin-bottom: 16px;
    }

    .contact-info p {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 24px;
    }

    .qr-box {
      display: flex;
      flex-direction: column;
      align-items: flex-start;
      gap: 10px;
      margin-top: 20px;
    }

    .qr-box img {
      width: 140px;
      height: 140px;
      border-radius: 8px;
      border: 1px solid var(--border);
    }

    .form-group {
      margin-bottom: 18px;
    }

    .form-group label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 6px;
      color: var(--dark);
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border);
      border-radius: 8px;
      font-size: 14px;
      outline: none;
      transition: border-color 0.2s ease;
      background: #fcfdfe;
    }

    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(255, 51, 102, 0.1);
    }

    textarea.form-control {
      resize: vertical;
      min-height: 100px;
    }

    /* 文章与资讯 */
    .article-links-container {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 16px;
      margin-top: 24px;
    }

    .article-pill {
      background: #ffffff;
      padding: 16px;
      border-radius: 8px;
      border: 1px solid var(--border);
      font-size: 14px;
      font-weight: 600;
      color: var(--dark);
      display: flex;
      align-items: center;
      justify-content: space-between;
      transition: all 0.2s ease;
    }

    .article-pill:hover {
      border-color: var(--primary);
      color: var(--primary);
      transform: translateX(4px);
    }

    /* 底部通用规范 */
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 20px;
      border-top: 1px solid #1e293b;
    }

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

    .footer-col h4 {
      color: #ffffff;
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 18px;
    }

    .footer-col ul {
      list-style: none;
    }

    .footer-col ul li {
      margin-bottom: 10px;
    }

    .footer-col ul li a {
      color: #94a3b8;
      font-size: 14px;
    }

    .footer-col ul li a:hover {
      color: #ffffff;
    }

    .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      padding: 20px 0;
      border-top: 1px solid #1e293b;
      border-bottom: 1px solid #1e293b;
      margin-bottom: 24px;
    }

    .friend-links a {
      color: #94a3b8;
      font-size: 13px;
    }

    .friend-links a:hover {
      color: #ff3366;
    }

    .copyright-bar {
      text-align: center;
      font-size: 13px;
      color: #64748b;
    }

    /* 浮动客服 */
    .floating-contact {
      position: fixed;
      right: 24px;
      bottom: 24px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      box-shadow: 0 4px 15px rgba(0,0,0,0.2);
      cursor: pointer;
      border: none;
      transition: transform 0.2s ease;
    }

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

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

    @media (max-width: 768px) {
      .hero-title {
        font-size: 28px;
      }
      .hero-stats {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3, .grid-4, .steps-container, .showcase-grid, .testimonial-grid {
        grid-template-columns: 1fr;
      }
      .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        border-bottom: 1px solid var(--border);
        padding: 20px;
      }
      .nav-links.active {
        display: flex;
      }
      .menu-toggle {
        display: block;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }