:root {
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --bg-alt: #f1f5f9;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --neon-cyan: #06b6d4;
      --neon-purple: #8b5cf6;
      --neon-green: #10b981;
      --neon-pink: #ec4899;
      --neon-amber: #f59e0b;
      --neon-border: rgba(6, 182, 212, 0.28);
      --neon-glow: 0 0 20px rgba(6, 182, 212, 0.15);
      --card-shadow: 0 10px 25px -5px rgba(15, 23, 42, 0.05), 0 8px 10px -6px rgba(15, 23, 42, 0.03);
      --card-shadow-hover: 0 20px 30px -10px rgba(6, 182, 212, 0.2), 0 10px 15px -5px rgba(139, 92, 246, 0.15);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --radius-full: 9999px;
      --container-max: 1240px;
      --transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    }
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    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-main);
      color: var(--text-main);
      line-height: 1.65;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }
    a { color: inherit; text-decoration: none; transition: var(--transition); }
    img { display: block; max-width: 100%; height: auto; }
    .ai-container {
      width: 100%;
      max-width: var(--container-max);
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    .section-spacing {
      padding-top: 80px;
      padding-bottom: 80px;
      position: relative;
    }
    .section-header {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 50px auto;
    }
    .section-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 16px;
      border-radius: var(--radius-full);
      background: linear-gradient(135deg, rgba(6, 182, 212, 0.1), rgba(139, 92, 246, 0.1));
      border: 1px solid var(--neon-border);
      color: #0891b2;
      font-size: 0.875rem;
      font-weight: 600;
      margin-bottom: 14px;
      letter-spacing: 0.5px;
    }
    .section-title {
      font-size: 2.25rem;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.5px;
      margin-bottom: 16px;
      line-height: 1.3;
    }
    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
      line-height: 1.6;
    }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(226, 232, 240, 0.8);
      transition: var(--transition);
    }
    .header-inner {
      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: 40px;
      width: auto;
      object-fit: contain;
    }
    .brand-title {
      font-size: 1.25rem;
      font-weight: 800;
      background: linear-gradient(135deg, #0f172a 30%, #0891b2 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 0;
    }
    .nav-links li a {
      font-size: 0.925rem;
      font-weight: 500;
      color: var(--text-muted);
      padding: 8px 12px;
      border-radius: var(--radius-sm);
    }
    .nav-links li a:hover {
      color: #0891b2;
      background: rgba(6, 182, 212, 0.08);
    }
    .header-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn-neon-glow {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.95rem;
      font-weight: 600;
      color: #ffffff;
      background: linear-gradient(135deg, #06b6d4 0%, #3b82f6 50%, #8b5cf6 100%);
      border-radius: var(--radius-full);
      box-shadow: 0 4px 15px rgba(6, 182, 212, 0.35);
      border: none;
      cursor: pointer;
      transition: var(--transition);
    }
    .btn-neon-glow:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 25px rgba(6, 182, 212, 0.5);
      color: #ffffff;
    }
    .btn-neon-outline {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 20px;
      font-size: 0.95rem;
      font-weight: 600;
      color: #0284c7;
      background: #ffffff;
      border: 1.5px solid #06b6d4;
      border-radius: var(--radius-full);
      transition: var(--transition);
    }
    .btn-neon-outline:hover {
      background: rgba(6, 182, 212, 0.08);
      transform: translateY(-2px);
      color: #0369a1;
    }
    .nav-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 6px;
      color: var(--text-main);
    }
    .nav-toggle svg { width: 26px; height: 26px; }
    .hero-section {
      padding: 90px 0 70px 0;
      background: radial-gradient(circle at 50% 20%, rgba(6, 182, 212, 0.12) 0%, rgba(139, 92, 246, 0.08) 35%, rgba(248, 250, 252, 0) 70%), var(--bg-main);
      text-align: center;
      position: relative;
    }
    .hero-badge-wrap {
      margin-bottom: 24px;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 8px 20px;
      border-radius: var(--radius-full);
      background: #ffffff;
      border: 1px solid rgba(6, 182, 212, 0.3);
      box-shadow: 0 4px 12px rgba(6, 182, 212, 0.12);
      font-size: 0.925rem;
      font-weight: 600;
      color: #0891b2;
    }
    .hero-badge-pulse {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: #10b981;
      box-shadow: 0 0 8px #10b981;
    }
    .hero-h1 {
      font-size: 2.85rem;
      font-weight: 900;
      line-height: 1.25;
      margin-bottom: 24px;
      color: var(--text-main);
      letter-spacing: -1px;
    }
    .hero-h1 span {
      background: linear-gradient(135deg, #06b6d4 10%, #6366f1 50%, #d946ef 90%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-subtitle {
      font-size: 1.25rem;
      color: var(--text-muted);
      max-width: 820px;
      margin: 0 auto 36px auto;
      line-height: 1.7;
    }
    .hero-cta-group {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 50px;
    }
    .hero-btn-official {
      padding: 14px 34px;
      font-size: 1.05rem;
      font-weight: 700;
      border-radius: var(--radius-full);
      background: linear-gradient(135deg, #00e5ff 0%, #0284c7 50%, #7c3aed 100%);
      color: #ffffff;
      box-shadow: 0 6px 25px rgba(6, 182, 212, 0.45);
      border: none;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .hero-btn-official:hover {
      transform: translateY(-3px) scale(1.02);
      box-shadow: 0 10px 32px rgba(6, 182, 212, 0.6);
      color: #ffffff;
    }
    .hero-metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      max-width: 1080px;
      margin: 0 auto;
    }
    .metric-card {
      background: #ffffff;
      padding: 24px 20px;
      border-radius: var(--radius-md);
      border: 1px solid rgba(226, 232, 240, 0.8);
      box-shadow: var(--card-shadow);
      transition: var(--transition);
      position: relative;
      overflow: hidden;
    }
    .metric-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 3px;
      background: linear-gradient(90deg, #06b6d4, #8b5cf6);
    }
    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-shadow-hover);
      border-color: var(--neon-border);
    }
    .metric-number {
      font-size: 2rem;
      font-weight: 800;
      color: #0f172a;
      margin-bottom: 4px;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 2px;
    }
    .metric-number span {
      font-size: 1.1rem;
      color: #0891b2;
      font-weight: 700;
    }
    .metric-label {
      font-size: 0.9rem;
      color: var(--text-muted);
      font-weight: 500;
    }
    .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;
    }
    .ai-card {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      padding: 28px;
      border: 1px solid rgba(226, 232, 240, 0.9);
      box-shadow: var(--card-shadow);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      position: relative;
    }
    .ai-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-shadow-hover);
      border-color: var(--neon-border);
    }
    .card-icon-box {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: linear-gradient(135deg, rgba(6, 182, 212, 0.15), rgba(139, 92, 246, 0.15));
      border: 1px solid var(--neon-border);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 18px;
      color: #0891b2;
      font-weight: 800;
      font-size: 1.25rem;
    }
    .card-title {
      font-size: 1.18rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }
    .card-desc {
      font-size: 0.925rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }
    .card-tag {
      display: inline-block;
      align-self: flex-start;
      margin-top: 14px;
      padding: 4px 10px;
      font-size: 0.775rem;
      font-weight: 600;
      border-radius: var(--radius-full);
      background: rgba(6, 182, 212, 0.08);
      color: #0891b2;
    }
    .model-tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 24px;
    }
    .model-chip {
      background: #ffffff;
      padding: 8px 16px;
      border-radius: var(--radius-full);
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--text-main);
      border: 1px solid rgba(226, 232, 240, 0.9);
      box-shadow: 0 2px 6px rgba(0, 0, 0, 0.03);
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .model-chip:hover {
      border-color: #06b6d4;
      color: #0891b2;
      transform: translateY(-2px);
      box-shadow: 0 4px 12px rgba(6, 182, 212, 0.2);
    }
    .table-container {
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid rgba(226, 232, 240, 0.9);
      box-shadow: var(--card-shadow);
      overflow-x: auto;
    }
    .custom-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.95rem;
    }
    .custom-table th {
      background: #f8fafc;
      padding: 16px 20px;
      font-weight: 700;
      color: var(--text-main);
      border-bottom: 2px solid #e2e8f0;
      white-space: nowrap;
    }
    .custom-table td {
      padding: 16px 20px;
      border-bottom: 1px solid #f1f5f9;
      color: var(--text-muted);
    }
    .custom-table tr:hover td {
      background: rgba(6, 182, 212, 0.03);
    }
    .custom-table .highlight-cell {
      font-weight: 700;
      color: #0891b2;
    }
    .step-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .step-card {
      background: #ffffff;
      border: 1px solid rgba(226, 232, 240, 0.9);
      padding: 24px;
      border-radius: var(--radius-md);
      box-shadow: var(--card-shadow);
      position: relative;
    }
    .step-index {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: linear-gradient(135deg, #06b6d4, #8b5cf6);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 1rem;
      margin-bottom: 16px;
    }
    .gallery-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
      margin-bottom: 24px;
    }
    .gallery-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid rgba(226, 232, 240, 0.9);
      box-shadow: var(--card-shadow);
      transition: var(--transition);
    }
    .gallery-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-shadow-hover);
    }
    .gallery-thumb {
      width: 100%;
      height: 240px;
      overflow: hidden;
      background: #e2e8f0;
    }
    .gallery-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .gallery-card:hover .gallery-thumb img {
      transform: scale(1.05);
    }
    .gallery-content {
      padding: 20px;
    }
    .gallery-title {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .banner-stream-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
    }
    .banner-item {
      border-radius: var(--radius-sm);
      overflow: hidden;
      box-shadow: var(--card-shadow);
      border: 1px solid #e2e8f0;
      background: #ffffff;
    }
    .banner-item img {
      width: 100%;
      height: 140px;
      object-fit: cover;
    }
    .review-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .review-card {
      background: #ffffff;
      padding: 26px;
      border-radius: var(--radius-md);
      border: 1px solid rgba(226, 232, 240, 0.9);
      box-shadow: var(--card-shadow);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .review-stars {
      color: #f59e0b;
      margin-bottom: 14px;
      font-size: 1.1rem;
    }
    .review-quote {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 20px;
      font-style: italic;
    }
    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f1f5f9;
      padding-top: 14px;
    }
    .author-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, rgba(6, 182, 212, 0.2), rgba(139, 92, 246, 0.2));
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: #0891b2;
      font-size: 1rem;
    }
    .author-name {
      font-weight: 700;
      font-size: 0.95rem;
      color: var(--text-main);
    }
    .author-role {
      font-size: 0.8rem;
      color: var(--text-light);
    }
    .faq-accordion {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .faq-item {
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid rgba(226, 232, 240, 0.9);
      box-shadow: var(--card-shadow);
      overflow: hidden;
      transition: var(--transition);
    }
    .faq-item.active {
      border-color: var(--neon-border);
      box-shadow: var(--neon-glow);
    }
    .faq-question {
      padding: 18px 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
      font-weight: 700;
      font-size: 1.05rem;
      color: var(--text-main);
      user-select: none;
    }
    .faq-icon {
      width: 24px;
      height: 24px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 50%;
      background: #f1f5f9;
      color: #0891b2;
      font-weight: 800;
      transition: transform 0.25s ease;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
      background: rgba(6, 182, 212, 0.15);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out, padding 0.3s ease;
      padding: 0 24px;
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.65;
    }
    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 0 24px 20px 24px;
    }
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1.1fr 1fr;
      gap: 36px;
      background: #ffffff;
      border-radius: var(--radius-lg);
      padding: 40px;
      border: 1px solid rgba(226, 232, 240, 0.9);
      box-shadow: var(--card-shadow);
    }
    .contact-info-list {
      display: flex;
      flex-direction: column;
      gap: 18px;
      margin: 24px 0;
    }
    .contact-item {
      display: flex;
      align-items: flex-start;
      gap: 14px;
      font-size: 0.95rem;
    }
    .contact-icon {
      width: 36px;
      height: 36px;
      border-radius: 8px;
      background: rgba(6, 182, 212, 0.1);
      color: #0891b2;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      flex-shrink: 0;
    }
    .qr-card {
      display: inline-flex;
      flex-direction: column;
      align-items: center;
      padding: 16px;
      background: #f8fafc;
      border-radius: var(--radius-md);
      border: 1px solid #e2e8f0;
      margin-top: 10px;
    }
    .qr-card img {
      width: 140px;
      height: 140px;
      object-fit: cover;
      border-radius: 6px;
      margin-bottom: 8px;
    }
    .qr-label {
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--text-muted);
    }
    .custom-form {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }
    .form-group label {
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      font-size: 0.95rem;
      border: 1.5px solid #cbd5e1;
      border-radius: var(--radius-sm);
      outline: none;
      transition: var(--transition);
      background: #ffffff;
      color: var(--text-main);
      font-family: inherit;
    }
    .form-control:focus {
      border-color: #06b6d4;
      box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.15);
    }
    textarea.form-control {
      min-height: 100px;
      resize: vertical;
    }
    .agency-box {
      background: linear-gradient(135deg, #f0fdf4 0%, #e0f2fe 50%, #faf5ff 100%);
      border: 1px solid rgba(6, 182, 212, 0.3);
      border-radius: var(--radius-lg);
      padding: 40px;
      text-align: center;
      position: relative;
    }
    .article-links-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 14px;
      margin-top: 20px;
    }
    .article-chip {
      background: #ffffff;
      padding: 14px 18px;
      border-radius: var(--radius-sm);
      border: 1px solid #e2e8f0;
      font-size: 0.9rem;
      color: var(--text-muted);
      display: flex;
      align-items: center;
      justify-content: space-between;
      transition: var(--transition);
    }
    .article-chip:hover {
      border-color: #06b6d4;
      color: #0891b2;
      transform: translateX(4px);
    }
    .site-footer {
      background: #ffffff;
      border-top: 1px solid #e2e8f0;
      padding: 40px 0 24px 0;
      font-size: 0.9rem;
      color: var(--text-muted);
    }
    .footer-top {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 30px;
      margin-bottom: 30px;
    }
    .footer-col-title {
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 14px;
      font-size: 1rem;
    }
    .footer-link-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    .footer-link-list a:hover {
      color: #0891b2;
    }
    .friend-links-box {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      align-items: center;
      padding: 16px 0;
      border-top: 1px solid #f1f5f9;
      border-bottom: 1px solid #f1f5f9;
      margin-bottom: 20px;
    }
    .friend-links-box a {
      font-size: 0.875rem;
      color: var(--text-light);
    }
    .friend-links-box a:hover {
      color: #0891b2;
    }
    .footer-bottom {
      text-align: center;
      font-size: 0.85rem;
      color: var(--text-light);
    }
    .floating-kefu {
      position: fixed;
      right: 24px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 10px;
    }
    .kefu-btn {
      width: 52px;
      height: 52px;
      border-radius: 50%;
      background: linear-gradient(135deg, #06b6d4, #8b5cf6);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 20px rgba(6, 182, 212, 0.4);
      cursor: pointer;
      transition: var(--transition);
      border: none;
    }
    .kefu-btn:hover {
      transform: scale(1.1);
      box-shadow: 0 6px 25px rgba(6, 182, 212, 0.6);
    }
    .kefu-card-pop {
      position: absolute;
      right: 64px;
      bottom: 0;
      background: #ffffff;
      padding: 16px;
      border-radius: var(--radius-md);
      box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
      border: 1px solid #e2e8f0;
      display: none;
      flex-direction: column;
      align-items: center;
      width: 170px;
    }
    .floating-kefu:hover .kefu-card-pop {
      display: flex;
    }
    @media (max-width: 1024px) {
      .hero-metrics-grid { grid-template-columns: repeat(2, 1fr); }
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .step-grid { grid-template-columns: repeat(2, 1fr); }
      .review-grid { grid-template-columns: repeat(2, 1fr); }
      .banner-stream-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-top { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        border-bottom: 1px solid #e2e8f0;
        gap: 0;
      }
      .nav-links.show { display: flex; }
      .nav-toggle { display: block; }
      .hero-h1 { font-size: 2.1rem; }
      .grid-3, .grid-4, .grid-2, .gallery-grid, .review-grid, .banner-stream-grid { grid-template-columns: 1fr; }
      .step-grid { grid-template-columns: 1fr; }
      .contact-wrapper { grid-template-columns: 1fr; padding: 24px; }
      .footer-top { grid-template-columns: 1fr; }
    }