:root {
      --primary: #4f46e5;
      --primary-hover: #4338ca;
      --secondary: #06b6d4;
      --accent: #f43f5e;
      --highlight: #8b5cf6;
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-sub: #475569;
      --text-muted: #64748b;
      --border-color: #e2e8f0;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
      --shadow-md: 0 10px 25px -5px rgba(79, 70, 229, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
      --shadow-lg: 0 20px 30px -10px rgba(79, 70, 229, 0.12);
      --radius: 12px;
      --radius-sm: 8px;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.6;
    }
    body {
      background: linear-gradient(180deg, #f1f5f9 0%, #f8fafc 15%, #ffffff 50%, #f8fafc 100%);
      color: var(--text-main);
      overflow-x: hidden;
      display: flex;
      flex-direction: column;
      min-height: 100vh;
    }
    .container {
      width: 100%;
      max-width: 1240px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease, opacity 0.2s ease;
    }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .nav-wrapper {
      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: 38px;
      width: auto;
      display: block;
    }
    .brand-title {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }
    .nav-menu {
      display: flex;
      align-items: center;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }
    .nav-links li a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-sub);
      padding: 8px 14px;
      border-radius: var(--radius-sm);
      transition: all 0.2s ease;
    }
    .nav-links li a:hover {
      color: var(--primary);
      background-color: #eff6ff;
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 9px 20px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: var(--radius-sm);
      cursor: pointer;
      border: 1px solid transparent;
      transition: all 0.25s ease;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, #3b82f6 100%);
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
    }
    .btn-primary:hover {
      background: linear-gradient(135deg, var(--primary-hover) 0%, #2563eb 100%);
      box-shadow: 0 6px 16px rgba(79, 70, 229, 0.35);
      transform: translateY(-1px);
    }
    .btn-outline {
      background-color: #ffffff;
      color: var(--text-main);
      border-color: var(--border-color);
    }
    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      background-color: #eff6ff;
    }
    .btn-sm {
      padding: 6px 14px;
      font-size: 0.875rem;
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
    }
    .hero-section {
      padding: 64px 0 56px;
      position: relative;
      overflow: hidden;
      background: radial-gradient(circle at 50% 10%, #e0e7ff 0%, #f8fafc 70%);
      border-bottom: 1px solid var(--border-color);
    }
    .hero-content {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
    }
    .badge-pill {
      display: inline-flex;
      align-items: center;
      padding: 6px 16px;
      border-radius: 9999px;
      font-size: 0.85rem;
      font-weight: 600;
      background: #eef2ff;
      color: var(--primary);
      border: 1px solid #c7d2fe;
      margin-bottom: 20px;
    }
    .hero-title {
      font-size: 2.5rem;
      font-weight: 900;
      line-height: 1.25;
      color: #0f172a;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-title span {
      background: linear-gradient(135deg, #4f46e5 0%, #06b6d4 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-desc {
      font-size: 1.125rem;
      color: var(--text-sub);
      line-height: 1.7;
      margin-bottom: 32px;
      max-width: 760px;
      margin-left: auto;
      margin-right: auto;
    }
    .hero-actions {
      display: flex;
      justify-content: center;
      gap: 16px;
      margin-bottom: 40px;
      flex-wrap: wrap;
    }
    .hero-btn-official {
      padding: 12px 32px;
      font-size: 1.05rem;
      font-weight: 700;
      background: linear-gradient(135deg, #e11d48 0%, #4f46e5 100%);
      color: #ffffff;
      border-radius: 30px;
      box-shadow: 0 8px 20px rgba(225, 29, 72, 0.3);
      transition: all 0.3s ease;
    }
    .hero-btn-official:hover {
      transform: translateY(-2px);
      box-shadow: 0 12px 24px rgba(225, 29, 72, 0.4);
    }
    .hero-stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-md);
      margin-top: 20px;
    }
    .stat-item {
      text-align: center;
      border-right: 1px solid var(--border-color);
    }
    .stat-item:last-child {
      border-right: none;
    }
    .stat-val {
      font-size: 1.75rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }
    .stat-lbl {
      font-size: 0.875rem;
      color: var(--text-sub);
    }
    .section {
      padding: 64px 0;
      border-bottom: 1px solid var(--border-color);
    }
    .section-alt {
      background-color: #f1f5f9;
    }
    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 48px;
    }
    .section-tag {
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--primary);
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 8px;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 12px;
    }
    .section-desc {
      font-size: 1rem;
      color: var(--text-sub);
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .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-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: #c7d2fe;
    }
    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: #eff6ff;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.25rem;
      font-weight: 800;
      margin-bottom: 16px;
    }
    .card-title {
      font-size: 1.2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }
    .card-text {
      font-size: 0.925rem;
      color: var(--text-sub);
      line-height: 1.6;
      flex-grow: 1;
    }
    .models-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      justify-content: center;
      margin-top: 24px;
    }
    .model-badge {
      background: #ffffff;
      border: 1px solid #cbd5e1;
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 0.85rem;
      font-weight: 600;
      color: #334155;
      box-shadow: 0 1px 2px rgba(0,0,0,0.03);
    }
    .model-badge.highlight {
      background: #eef2ff;
      border-color: #a5b4fc;
      color: var(--primary);
    }
    .media-card {
      overflow: hidden;
      padding: 0;
      border-radius: var(--radius);
      background: #ffffff;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .media-card-img-wrapper {
      position: relative;
      background: #e2e8f0;
      aspect-ratio: 16/9;
      overflow: hidden;
    }
    .media-card-img-wrapper.square {
      aspect-ratio: 1/1;
    }
    .media-card-img-wrapper img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: transform 0.4s ease;
    }
    .media-card:hover .media-card-img-wrapper img {
      transform: scale(1.04);
    }
    .media-card-body {
      padding: 20px;
    }
    .table-container {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .table-custom {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.95rem;
    }
    .table-custom th, .table-custom td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
    }
    .table-custom th {
      background-color: #f8fafc;
      font-weight: 700;
      color: var(--text-main);
    }
    .table-custom tr:last-child td {
      border-bottom: none;
    }
    .table-custom tr:hover {
      background-color: #faf5ff;
    }
    .star-rating {
      color: #f59e0b;
      font-weight: 800;
    }
    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 22px;
      display: flex;
      flex-direction: column;
      box-shadow: var(--shadow-sm);
    }
    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 12px;
    }
    .review-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
    }
    .review-meta h4 {
      font-size: 1rem;
      color: var(--text-main);
    }
    .review-meta span {
      font-size: 0.8rem;
      color: var(--text-muted);
    }
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .faq-question {
      width: 100%;
      padding: 18px 20px;
      text-align: left;
      font-size: 1.05rem;
      font-weight: 600;
      color: var(--text-main);
      background: none;
      border: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }
    .faq-question:hover {
      color: var(--primary);
    }
    .faq-answer {
      display: none;
      padding: 0 20px 18px;
      font-size: 0.95rem;
      color: var(--text-sub);
      line-height: 1.6;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .faq-icon {
      font-size: 1.25rem;
      line-height: 1;
      color: var(--text-muted);
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
      color: var(--primary);
    }
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 32px;
    }
    .contact-info {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 32px;
      box-shadow: var(--shadow-sm);
    }
    .contact-info h3 {
      font-size: 1.3rem;
      margin-bottom: 16px;
      color: var(--text-main);
    }
    .contact-item {
      display: flex;
      gap: 12px;
      margin-bottom: 16px;
      font-size: 0.95rem;
      color: var(--text-sub);
      align-items: center;
    }
    .contact-qr {
      margin-top: 24px;
      text-align: center;
      background: #f8fafc;
      padding: 16px;
      border-radius: var(--radius-sm);
      border: 1px dashed var(--border-color);
    }
    .contact-qr img {
      max-width: 140px;
      height: auto;
      border-radius: 6px;
      display: block;
      margin: 0 auto 8px;
    }
    .form-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 32px;
      box-shadow: var(--shadow-sm);
    }
    .form-group {
      margin-bottom: 18px;
    }
    .form-label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 6px;
    }
    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 10px 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      color: var(--text-main);
      background-color: #ffffff;
      outline: none;
      transition: border-color 0.2s ease;
    }
    .form-input:focus, .form-select:focus, .form-textarea:focus {
      border-color: var(--primary);
    }
    .form-textarea {
      resize: vertical;
      min-height: 100px;
    }
    .footer {
      background-color: #0f172a;
      color: #94a3b8;
      padding: 56px 0 24px;
      font-size: 0.9rem;
      border-top: 1px solid #1e293b;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 32px;
      margin-bottom: 40px;
    }
    .footer-brand h4 {
      color: #ffffff;
      font-size: 1.25rem;
      margin-bottom: 12px;
    }
    .footer-brand p {
      line-height: 1.6;
      margin-bottom: 16px;
    }
    .footer-column h5 {
      color: #ffffff;
      font-size: 1rem;
      margin-bottom: 16px;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-links a {
      color: #94a3b8;
    }
    .footer-links a:hover {
      color: #ffffff;
    }
    .friend-links-area {
      padding-top: 24px;
      border-top: 1px solid #1e293b;
      margin-bottom: 24px;
    }
    .friend-links-area h6 {
      color: #cbd5e1;
      font-size: 0.85rem;
      margin-bottom: 10px;
    }
    .friend-links-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }
    .friend-links-wrap a {
      color: #94a3b8;
      font-size: 0.85rem;
    }
    .friend-links-wrap a:hover {
      color: #38bdf8;
    }
    .footer-bottom {
      text-align: center;
      padding-top: 20px;
      border-top: 1px solid #1e293b;
      font-size: 0.8rem;
      color: #64748b;
    }
    .floating-widget {
      position: fixed;
      bottom: 30px;
      right: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .floating-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--primary);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 14px rgba(0,0,0,0.25);
      cursor: pointer;
      border: none;
      font-size: 1.2rem;
      transition: all 0.2s ease;
    }
    .floating-btn:hover {
      transform: scale(1.08);
    }
    @media (max-width: 1024px) {
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 768px) {
      .hero-title {
        font-size: 1.85rem;
      }
      .hero-stats {
        grid-template-columns: repeat(2, 1fr);
      }
      .stat-item:nth-child(2) {
        border-right: none;
      }
      .grid-3, .grid-2 {
        grid-template-columns: 1fr;
      }
      .contact-wrapper {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .menu-toggle {
        display: block;
      }
      .nav-menu {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        border-bottom: 1px solid var(--border-color);
        padding: 20px;
        box-shadow: var(--shadow-md);
      }
      .nav-menu.active {
        display: flex;
        flex-direction: column;
        align-items: flex-start;
      }
      .nav-links {
        flex-direction: column;
        width: 100%;
      }
      .nav-links li {
        width: 100%;
      }
      .nav-links li a {
        display: block;
        padding: 10px 0;
      }
      .nav-actions {
        margin-top: 16px;
        width: 100%;
      }
      .nav-actions .btn {
        width: 100%;
      }
    }