:root {
      --primary: #2563eb;
      --primary-light: #3b82f6;
      --primary-dark: #1d4ed8;
      --primary-soft: #eff6ff;
      --accent: #f97316;
      --accent-soft: #fff7ed;
      --success: #10b981;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --bg-page: #f8fafc;
      --bg-card: #ffffff;
      --border-color: #e2e8f0;
      --border-focus: #93c5fd;
      --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
      --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
      --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
      --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
      --radius-full: 9999px;
      --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }
    * {
      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, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container {
      width: 100%;
      max-width: 1240px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    .section {
      padding: 70px 0;
      position: relative;
    }
    .section-alt {
      background-color: #ffffff;
    }
    .section-header {
      text-align: center;
      max-width: 780px;
      margin: 0 auto 48px auto;
    }
    .section-tag {
      display: inline-flex;
      align-items: center;
      padding: 4px 14px;
      background: var(--primary-soft);
      color: var(--primary);
      border-radius: var(--radius-full);
      font-size: 0.875rem;
      font-weight: 600;
      margin-bottom: 12px;
      border: 1px solid rgba(37, 99, 235, 0.2);
    }
    .section-title {
      font-size: 2.1rem;
      font-weight: 700;
      color: var(--text-main);
      letter-spacing: -0.02em;
      margin-bottom: 14px;
      line-height: 1.3;
    }
    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
      line-height: 1.65;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 12px 26px;
      font-size: 0.975rem;
      font-weight: 600;
      border-radius: var(--radius-md);
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      white-space: nowrap;
      text-align: center;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary), var(--primary-dark));
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
    }
    .btn-primary:hover {
      background: linear-gradient(135deg, var(--primary-light), var(--primary));
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(37, 99, 235, 0.45);
    }
    .btn-accent {
      background: linear-gradient(135deg, var(--accent), #ea580c);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(249, 115, 22, 0.35);
    }
    .btn-accent:hover {
      background: linear-gradient(135deg, #fb923c, var(--accent));
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(249, 115, 22, 0.45);
    }
    .btn-secondary {
      background: #ffffff;
      color: var(--text-main);
      border-color: var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .btn-secondary:hover {
      background: var(--primary-soft);
      color: var(--primary);
      border-color: var(--primary-light);
      transform: translateY(-2px);
    }
    .btn-lg {
      padding: 14px 32px;
      font-size: 1.05rem;
      border-radius: var(--radius-lg);
    }
    .card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 28px;
      transition: var(--transition);
      position: relative;
    }
    .card:hover {
      border-color: var(--primary-light);
      box-shadow: var(--shadow-lg);
      transform: translateY(-4px);
    }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .nav-brand {
      display: flex;
      align-items: center;
      gap: 12px;
      flex-shrink: 0;
    }
    .nav-brand .ai-page-logo {
      height: 38px;
      width: auto;
      object-fit: contain;
    }
    .brand-title {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.01em;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }
    .nav-item a {
      display: block;
      padding: 10px 14px;
      font-size: 0.925rem;
      font-weight: 500;
      color: var(--text-muted);
      border-radius: var(--radius-sm);
    }
    .nav-item a:hover {
      color: var(--primary);
      background: var(--primary-soft);
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
      color: var(--text-main);
    }
    .hero-section {
      padding: 70px 0 60px 0;
      background: linear-gradient(180deg, #ffffff 0%, #eff6ff 60%, #f8fafc 100%);
      position: relative;
      overflow: hidden;
      border-bottom: 1px solid var(--border-color);
    }
    .hero-content {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: #ffffff;
      border: 1px solid #bfdbfe;
      border-radius: var(--radius-full);
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--primary);
      box-shadow: 0 2px 8px rgba(37, 99, 235, 0.08);
      margin-bottom: 24px;
    }
    .hero-title {
      font-size: 2.85rem;
      font-weight: 800;
      line-height: 1.22;
      color: var(--text-main);
      margin-bottom: 22px;
      letter-spacing: -0.02em;
    }
    .hero-title span {
      color: var(--primary);
      display: inline-block;
    }
    .hero-subtitle {
      font-size: 1.18rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 34px;
      max-width: 760px;
      margin-left: auto;
      margin-right: auto;
    }
    .hero-actions {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 40px;
    }
    .hero-stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 18px;
      margin-top: 40px;
      text-align: left;
    }
    .hero-stat-card {
      background: #ffffff;
      border: 1px solid #dbeafe;
      border-radius: var(--radius-md);
      padding: 18px 20px;
      box-shadow: var(--shadow-sm);
    }
    .hero-stat-val {
      font-size: 1.75rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1;
      margin-bottom: 6px;
    }
    .hero-stat-lbl {
      font-size: 0.85rem;
      color: var(--text-muted);
    }
    .platform-tags-wrap {
      margin-top: 36px;
      padding-top: 28px;
      border-top: 1px dashed #cbd5e1;
    }
    .platform-tags-title {
      font-size: 0.9rem;
      color: var(--text-light);
      margin-bottom: 14px;
      font-weight: 600;
    }
    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 8px;
    }
    .tag-item {
      display: inline-block;
      padding: 4px 11px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.825rem;
      color: var(--text-muted);
      font-weight: 500;
      transition: var(--transition);
    }
    .tag-item:hover {
      border-color: var(--primary-light);
      color: var(--primary);
      background: var(--primary-soft);
      transform: translateY(-2px);
    }
    .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: 28px;
    }
    .service-icon {
      width: 48px;
      height: 48px;
      border-radius: var(--radius-md);
      background: var(--primary-soft);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.35rem;
      margin-bottom: 18px;
      font-weight: bold;
    }
    .service-title {
      font-size: 1.2rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }
    .service-desc {
      font-size: 0.925rem;
      color: var(--text-muted);
      line-height: 1.6;
    }
    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
      gap: 20px;
    }
    .scenario-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 22px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .scenario-card:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-md);
      transform: translateY(-3px);
    }
    .scenario-header {
      display: flex;
      align-items: center;
      gap: 10px;
      margin-bottom: 12px;
    }
    .scenario-pill {
      font-size: 0.75rem;
      padding: 2px 8px;
      border-radius: var(--radius-full);
      background: var(--accent-soft);
      color: var(--accent);
      font-weight: 600;
    }
    .scenario-name {
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-main);
    }
    .scenario-desc {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.55;
      margin-bottom: 14px;
    }
    .scenario-feat {
      font-size: 0.8rem;
      color: var(--primary);
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 4px;
    }
    .workflow-steps {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 16px;
      position: relative;
    }
    .step-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 22px 18px;
      text-align: center;
      position: relative;
    }
    .step-num {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: var(--primary);
      color: #ffffff;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 14px auto;
      font-size: 1rem;
    }
    .step-title {
      font-size: 1.02rem;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .step-desc {
      font-size: 0.85rem;
      color: var(--text-muted);
      line-height: 1.5;
    }
    .rating-banner {
      background: linear-gradient(135deg, #1e3a8a, #2563eb);
      color: #ffffff;
      border-radius: var(--radius-lg);
      padding: 36px;
      margin-bottom: 32px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
      flex-wrap: wrap;
    }
    .rating-main {
      display: flex;
      align-items: center;
      gap: 20px;
    }
    .rating-score {
      font-size: 3.6rem;
      font-weight: 900;
      line-height: 1;
      color: #facc15;
    }
    .rating-stars {
      color: #facc15;
      font-size: 1.4rem;
      letter-spacing: 2px;
      margin-bottom: 4px;
    }
    .rating-label {
      font-size: 1.15rem;
      font-weight: 700;
    }
    .rating-sub {
      font-size: 0.9rem;
      opacity: 0.9;
    }
    .table-container {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-sm);
    }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.925rem;
    }
    .compare-table th, .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
    }
    .compare-table th {
      background: #f8fafc;
      color: var(--text-main);
      font-weight: 700;
    }
    .compare-table tr:last-child td {
      border-bottom: none;
    }
    .compare-table .highlight-col {
      background: #eff6ff;
      font-weight: 600;
      color: var(--primary);
    }
    .badge-good {
      color: #16a34a;
      font-weight: 600;
    }
    .badge-bad {
      color: #94a3b8;
    }
    .media-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .media-card:hover {
      box-shadow: var(--shadow-lg);
      transform: translateY(-4px);
    }
    .media-card-img-wrap {
      width: 100%;
      overflow: hidden;
      background: #f1f5f9;
      position: relative;
    }
    .media-card-body {
      padding: 22px;
    }
    .media-card-title {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .media-card-desc {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.6;
    }
    .review-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 26px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .review-user {
      display: flex;
      align-items: center;
      gap: 14px;
      margin-bottom: 16px;
    }
    .user-avatar-badge {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary), #60a5fa);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.1rem;
      flex-shrink: 0;
    }
    .user-meta-name {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-main);
    }
    .user-meta-role {
      font-size: 0.8rem;
      color: var(--text-light);
    }
    .review-text {
      font-size: 0.925rem;
      color: var(--text-muted);
      line-height: 1.65;
      font-style: normal;
    }
    .review-stars {
      margin-top: 14px;
      color: #f59e0b;
      font-size: 0.9rem;
    }
    .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: var(--radius-md);
      overflow: hidden;
      transition: var(--transition);
    }
    .faq-question {
      width: 100%;
      padding: 18px 24px;
      text-align: left;
      font-size: 1.05rem;
      font-weight: 600;
      color: var(--text-main);
      background: none;
      border: none;
      display: flex;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-icon {
      font-size: 1.2rem;
      color: var(--primary);
      transition: transform 0.25s ease;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: #f8fafc;
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.65;
      padding: 0 24px;
    }
    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 16px 24px 22px 24px;
      border-top: 1px solid var(--border-color);
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    .form-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-md);
    }
    .form-group {
      margin-bottom: 20px;
    }
    .form-label {
      display: block;
      font-size: 0.925rem;
      font-weight: 600;
      margin-bottom: 8px;
      color: var(--text-main);
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      font-size: 0.95rem;
      background: #f8fafc;
      transition: var(--transition);
      color: var(--text-main);
      font-family: inherit;
    }
    .form-control:focus {
      outline: none;
      background: #ffffff;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
    }
    .form-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }
    .contact-info-card {
      background: linear-gradient(135deg, #eff6ff, #f8fafc);
      border: 1px solid #dbeafe;
      border-radius: var(--radius-lg);
      padding: 36px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .contact-item {
      display: flex;
      align-items: flex-start;
      gap: 14px;
      margin-bottom: 20px;
    }
    .contact-item-icon {
      width: 40px;
      height: 40px;
      border-radius: var(--radius-md);
      background: var(--primary);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.1rem;
      flex-shrink: 0;
    }
    .contact-item-title {
      font-size: 0.85rem;
      color: var(--text-light);
    }
    .contact-item-val {
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-main);
    }
    .qr-container {
      text-align: center;
      padding: 20px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      margin-top: 14px;
    }
    .qr-img-wrap {
      max-width: 140px;
      margin: 0 auto 10px auto;
    }
    .qr-label {
      font-size: 0.85rem;
      color: var(--text-muted);
      font-weight: 600;
    }
    .news-list {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
    }
    .news-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      transition: var(--transition);
    }
    .news-item:hover {
      border-color: var(--primary);
      transform: translateX(4px);
    }
    .news-item-title {
      font-size: 0.98rem;
      font-weight: 600;
      color: var(--text-main);
    }
    .news-item-tag {
      font-size: 0.75rem;
      padding: 2px 8px;
      background: var(--primary-soft);
      color: var(--primary);
      border-radius: var(--radius-sm);
      white-space: nowrap;
    }
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px 0;
      border-top: 1px solid #1e293b;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-brand-title {
      color: #ffffff;
      font-size: 1.3rem;
      font-weight: 800;
      margin-bottom: 14px;
    }
    .footer-brand-desc {
      font-size: 0.9rem;
      line-height: 1.65;
      margin-bottom: 20px;
      color: #94a3b8;
    }
    .footer-col-title {
      color: #ffffff;
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 18px;
    }
    .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;
      text-decoration: underline;
    }
    .friendly-links-wrap {
      border-top: 1px solid #1e293b;
      padding: 24px 0;
      margin-bottom: 24px;
      font-size: 0.875rem;
    }
    .friendly-links-title {
      color: #cbd5e1;
      font-weight: 600;
      margin-bottom: 10px;
    }
    .friendly-links-list {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }
    .friendly-links-list a {
      color: #94a3b8;
    }
    .friendly-links-list a:hover {
      color: #38bdf8;
    }
    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 14px;
      font-size: 0.85rem;
    }
    .fixed-floating-box {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 99;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .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);
      font-weight: bold;
      transition: var(--transition);
    }
    .float-btn:hover {
      background: var(--primary);
      color: #ffffff;
      transform: scale(1.08);
    }
    .float-btn-main {
      background: var(--primary);
      color: #ffffff;
    }
    .float-btn-main:hover {
      background: var(--primary-dark);
    }
    @media (max-width: 1024px) {
      .grid-3, .review-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .workflow-steps {
        grid-template-columns: repeat(3, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 768px) {
      .nav-links, .nav-actions .btn-secondary {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      .nav-links.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        border-bottom: 1px solid var(--border-color);
        padding: 16px 20px;
        box-shadow: var(--shadow-lg);
      }
      .hero-title {
        font-size: 2.1rem;
      }
      .hero-stats {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-2, .grid-3, .grid-4, .review-grid, .news-list, .form-row {
        grid-template-columns: 1fr;
      }
      .workflow-steps {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .rating-banner {
        flex-direction: column;
        text-align: center;
      }
      .rating-main {
        flex-direction: column;
      }
    }