:root {
      --primary: #4338ca;
      --primary-light: #6366f1;
      --secondary: #0ea5e9;
      --accent: #f43f5e;
      --accent-warm: #f59e0b;
      --text-dark: #0f172a;
      --text-muted: #475569;
      --bg-page: #f8fafc;
      --bg-card: #ffffff;
      --border-color: #e2e8f0;
      --gradient-brand: linear-gradient(135deg, #4338ca 0%, #0ea5e9 50%, #10b981 100%);
      --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
      --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
      --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-tap-highlight-color: transparent;
    }

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

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

    a {
      color: inherit;
      text-decoration: none;
    }

    .container {
      width: 100%;
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 顶部导航 */
    header.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-color);
      box-shadow: var(--shadow-sm);
    }

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

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

    .ai-page-logo {
      max-height: 44px;
      width: auto;
      object-fit: contain;
    }

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

    .nav-links li a {
      padding: 8px 12px;
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-dark);
      border-radius: 6px;
      transition: all 0.2s ease;
    }

    .nav-links li a:hover {
      color: var(--primary);
      background-color: #f1f5f9;
    }

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

    .btn-nav-primary {
      background: linear-gradient(135deg, #4338ca, #6366f1);
      color: #ffffff !important;
      padding: 8px 18px;
      border-radius: 9999px;
      font-weight: 600;
      font-size: 0.9rem;
      box-shadow: 0 4px 10px rgba(67, 56, 202, 0.25);
      transition: transform 0.2s ease, box-shadow 0.2s ease;
      display: inline-block;
    }

    .btn-nav-primary:hover {
      transform: translateY(-1px);
      box-shadow: 0 6px 14px rgba(67, 56, 202, 0.35);
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 6px;
    }

    .mobile-menu-toggle span {
      display: block;
      width: 24px;
      height: 2px;
      background-color: var(--text-dark);
      margin: 5px 0;
      transition: 0.3s;
    }

    /* 模块通用样式 */
    section {
      padding: 80px 0;
      position: relative;
    }

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

    .section-tag {
      display: inline-block;
      padding: 4px 12px;
      border-radius: 9999px;
      background: #e0e7ff;
      color: var(--primary);
      font-size: 0.85rem;
      font-weight: 600;
      margin-bottom: 12px;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--text-dark);
      margin-bottom: 14px;
      line-height: 1.3;
    }

    .section-subtitle {
      font-size: 1.05rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* Hero 首屏 - 严禁出现图片资源 */
    .hero-section {
      padding: 100px 0 80px 0;
      background: radial-gradient(circle at 80% 20%, #e0e7ff 0%, #f8fafc 40%),
                  radial-gradient(circle at 10% 60%, #ccfbf1 0%, #f8fafc 50%);
      border-bottom: 1px solid var(--border-color);
      overflow: hidden;
    }

    .hero-content {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #ffffff;
      border: 1px solid #cbd5e1;
      padding: 6px 16px;
      border-radius: 9999px;
      box-shadow: var(--shadow-sm);
      margin-bottom: 24px;
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    .hero-badge-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background-color: #10b981;
      box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
    }

    .hero-title {
      font-size: 2.75rem;
      line-height: 1.25;
      font-weight: 800;
      color: var(--text-dark);
      margin-bottom: 24px;
    }

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

    .hero-desc {
      font-size: 1.2rem;
      color: var(--text-muted);
      margin-bottom: 36px;
      line-height: 1.7;
      max-width: 780px;
      margin-left: auto;
      margin-right: auto;
    }

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

    .btn-main-official {
      background: linear-gradient(135deg, #4338ca 0%, #2563eb 100%);
      color: #ffffff !important;
      font-size: 1.1rem;
      font-weight: 700;
      padding: 14px 34px;
      border-radius: 12px;
      box-shadow: 0 10px 20px -5px rgba(67, 56, 202, 0.4);
      transition: all 0.25s ease;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }

    .btn-main-official:hover {
      transform: translateY(-2px);
      box-shadow: 0 14px 26px -5px rgba(67, 56, 202, 0.5);
    }

    .btn-sub-action {
      background: #ffffff;
      color: var(--text-dark);
      font-size: 1.1rem;
      font-weight: 600;
      padding: 14px 28px;
      border-radius: 12px;
      border: 1px solid #cbd5e1;
      transition: all 0.25s ease;
    }

    .btn-sub-action:hover {
      background: #f1f5f9;
      border-color: #94a3b8;
    }

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

    .hero-stat-box {
      background: rgba(255, 255, 255, 0.85);
      border: 1px solid #e2e8f0;
      border-radius: 16px;
      padding: 20px;
      box-shadow: var(--shadow-sm);
    }

    .hero-stat-num {
      font-size: 1.9rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }

    .hero-stat-lbl {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* 平台矩阵卡片 */
    .brand-matrix-strip {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
      padding: 30px 0;
    }

    .brand-matrix-desc {
      text-align: center;
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-muted);
      margin-bottom: 20px;
      letter-spacing: 0.5px;
    }

    .badge-cloud {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
    }

    .model-chip {
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: 8px;
      padding: 6px 14px;
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--text-dark);
      transition: all 0.2s;
    }

    .model-chip:hover {
      background: #eef2ff;
      border-color: #a5b4fc;
      color: var(--primary);
    }

    /* 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;
    }

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
    }

    .feature-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 16px;
      padding: 28px;
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }

    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: #cbd5e1;
    }

    .card-icon-square {
      width: 52px;
      height: 52px;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 18px;
      font-size: 1.4rem;
      background: linear-gradient(135deg, #e0e7ff, #ede9fe);
      color: var(--primary);
    }

    .card-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 10px;
    }

    .card-desc {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    .card-tag-row {
      margin-top: 16px;
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
    }

    .mini-pill {
      font-size: 0.75rem;
      background: #f1f5f9;
      color: #334155;
      padding: 3px 8px;
      border-radius: 4px;
    }

    /* 对比评测表格与卡片 */
    .review-score-panel {
      background: linear-gradient(135deg, #eef2ff 0%, #ffffff 100%);
      border: 2px solid #818cf8;
      border-radius: 20px;
      padding: 32px;
      margin-bottom: 40px;
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 24px;
    }

    .score-left {
      display: flex;
      align-items: center;
      gap: 24px;
    }

    .score-badge-circle {
      width: 100px;
      height: 100px;
      background: var(--gradient-brand);
      border-radius: 50%;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      color: #ffffff;
      box-shadow: 0 8px 16px rgba(67, 56, 202, 0.3);
    }

    .score-badge-circle .score-num {
      font-size: 2.2rem;
      font-weight: 900;
      line-height: 1;
    }

    .score-badge-circle .score-scale {
      font-size: 0.75rem;
      opacity: 0.9;
    }

    .score-meta h3 {
      font-size: 1.5rem;
      font-weight: 800;
      margin-bottom: 6px;
    }

    .star-row {
      color: #f59e0b;
      font-size: 1.25rem;
      letter-spacing: 2px;
      margin-bottom: 6px;
    }

    .table-container {
      background: #ffffff;
      border-radius: 16px;
      border: 1px solid var(--border-color);
      overflow-x: auto;
      box-shadow: var(--shadow-sm);
    }

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

    table.compare-table th,
    table.compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.95rem;
    }

    table.compare-table th {
      background: #f8fafc;
      color: var(--text-muted);
      font-weight: 600;
    }

    table.compare-table tr:last-child td {
      border-bottom: none;
    }

    .highlight-col {
      background: #f5f7ff;
      font-weight: 600;
      color: var(--primary);
    }

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

    .step-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 14px;
      padding: 24px;
      position: relative;
      box-shadow: var(--shadow-sm);
    }

    .step-number {
      font-size: 1.8rem;
      font-weight: 900;
      color: #e2e8f0;
      margin-bottom: 12px;
    }

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

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

    /* 真实媒体展示区 */
    .gallery-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
      align-items: stretch;
    }

    .media-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 16px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .media-box-img-wrap {
      width: 100%;
      aspect-ratio: 16 / 9;
      background: #f1f5f9;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }

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

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

    .media-box:hover img {
      transform: scale(1.03);
    }

    .media-box-info {
      padding: 20px;
    }

    .media-box-title {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 6px;
    }

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

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

    .testimonial-quote {
      font-size: 0.95rem;
      color: #334155;
      line-height: 1.7;
      margin-bottom: 18px;
    }

    .testimonial-user {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f1f5f9;
      padding-top: 14px;
    }

    .avatar-mock {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: linear-gradient(135deg, #a5b4fc, #6366f1);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #ffffff;
      font-weight: 700;
      font-size: 0.95rem;
    }

    .user-info h4 {
      font-size: 0.95rem;
      font-weight: 700;
    }

    .user-info p {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* FAQ 手风琴 */
    .faq-wrapper {
      max-width: 860px;
      margin: 0 auto;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 12px;
      margin-bottom: 12px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .faq-trigger {
      width: 100%;
      padding: 18px 24px;
      background: none;
      border: none;
      text-align: left;
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-dark);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }

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

    .faq-symbol {
      font-size: 1.4rem;
      font-weight: 300;
      transition: transform 0.2s;
    }

    .faq-content {
      padding: 0 24px;
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s cubic-bezier(0, 1, 0, 1), padding 0.3s ease;
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.7;
    }

    .faq-item.active .faq-content {
      padding: 0 24px 20px 24px;
      max-height: 400px;
      transition: max-height 0.3s ease-in, padding 0.3s ease;
    }

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

    /* 表单与需求匹配 */
    .form-wrapper {
      background: #ffffff;
      border-radius: 20px;
      border: 1px solid var(--border-color);
      padding: 40px;
      box-shadow: var(--shadow-md);
      max-width: 800px;
      margin: 0 auto;
    }

    .form-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      margin-bottom: 20px;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
      margin-bottom: 20px;
    }

    .form-group label {
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-dark);
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border-radius: 8px;
      border: 1px solid #cbd5e1;
      font-size: 0.95rem;
      font-family: inherit;
      outline: none;
      transition: border-color 0.2s;
    }

    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(67, 56, 202, 0.15);
    }

    .btn-submit {
      width: 100%;
      background: linear-gradient(135deg, #4338ca, #2563eb);
      color: #ffffff;
      font-size: 1.05rem;
      font-weight: 700;
      padding: 14px;
      border: none;
      border-radius: 10px;
      cursor: pointer;
      transition: all 0.2s;
    }

    .btn-submit:hover {
      opacity: 0.95;
      transform: translateY(-1px);
    }

    /* 页脚与友情链接 */
    footer.site-footer {
      background-color: #0f172a;
      color: #94a3b8;
      padding: 70px 0 30px 0;
      border-top: 1px solid #1e293b;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 50px;
    }

    .footer-col h4 {
      color: #f8fafc;
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 20px;
    }

    .footer-links-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
      font-size: 0.9rem;
    }

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

    .footer-contact-item {
      display: flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 10px;
      font-size: 0.9rem;
    }

    .qrcode-box {
      width: 110px;
      height: 110px;
      background: #ffffff;
      border-radius: 8px;
      padding: 6px;
      display: inline-block;
      margin-top: 10px;
    }

    .qrcode-box img {
      width: 100%;
      height: 100%;
      object-fit: contain;
    }

    .friendly-links-bar {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      margin-bottom: 24px;
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      align-items: center;
      font-size: 0.85rem;
    }

    .friendly-links-bar a {
      color: #64748b;
      transition: color 0.2s;
    }

    .friendly-links-bar a:hover {
      color: #cbd5e1;
    }

    .copyright-bar {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      text-align: center;
      font-size: 0.85rem;
      color: #64748b;
    }

    /* 浮动工具挂件 */
    .floating-widget {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-lg);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      color: var(--primary);
      transition: transform 0.2s;
      position: relative;
    }

    .float-btn:hover {
      transform: scale(1.08);
    }

    .float-qrcode-hover {
      display: none;
      position: absolute;
      right: 60px;
      bottom: 0;
      background: #ffffff;
      padding: 12px;
      border-radius: 12px;
      box-shadow: var(--shadow-lg);
      width: 140px;
      text-align: center;
      border: 1px solid var(--border-color);
    }

    .float-qrcode-hover img {
      width: 100%;
      height: auto;
      border-radius: 6px;
    }

    .float-btn:hover .float-qrcode-hover {
      display: block;
    }

    /* 响应式适配 */
    @media (max-width: 1024px) {
      .grid-4, .hero-stats-grid, .workflow-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .mobile-menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow-md);
        border-bottom: 1px solid var(--border-color);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links li {
        width: 100%;
        text-align: center;
      }
      .nav-links li a {
        display: block;
        padding: 12px 0;
      }
      .hero-title {
        font-size: 2rem;
      }
      .grid-3, .grid-2, .gallery-grid {
        grid-template-columns: 1fr;
      }
      .form-row {
        grid-template-columns: 1fr;
      }
      .score-left {
        flex-direction: column;
        text-align: center;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }