:root {
      --bg-main: #f8fafc;
      --bg-subtle: #f1f5f9;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --brand-primary: #2563eb;
      --brand-accent: #7c3aed;
      --holo-cyan: #06b6d4;
      --holo-pink: #ec4899;
      --holo-violet: #8b5cf6;
      --border-color: #e2e8f0;
      --border-holo: linear-gradient(135deg, rgba(6,182,212,0.4), rgba(236,72,153,0.4), rgba(139,92,246,0.4));
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.05);
      --shadow-md: 0 8px 24px rgba(148, 163, 184, 0.15);
      --shadow-holo: 0 12px 36px rgba(139, 92, 246, 0.12);
      --transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.6;
      background-image: 
        radial-gradient(circle at 10% 10%, rgba(224, 242, 254, 0.6) 0%, transparent 40%),
        radial-gradient(circle at 90% 20%, rgba(253, 242, 248, 0.7) 0%, transparent 45%),
        radial-gradient(circle at 50% 60%, rgba(245, 243, 255, 0.6) 0%, transparent 50%),
        radial-gradient(circle at 80% 90%, rgba(224, 231, 255, 0.5) 0%, transparent 40%);
      background-attachment: fixed;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }
    .ai-container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.88);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(226, 232, 240, 0.8);
      box-shadow: 0 4px 20px rgba(0,0,0,0.03);
    }
    .nav-wrap {
      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: 42px;
      width: auto;
      display: block;
    }
    .brand-title {
      font-size: 1.25rem;
      font-weight: 700;
      background: linear-gradient(135deg, #0f172a 30%, #4338ca 70%, #06b6d4 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      letter-spacing: -0.5px;
    }
    .nav-menu {
      display: flex;
      align-items: center;
    }
    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 0;
    }
    .nav-links li a {
      display: block;
      padding: 8px 14px;
      font-size: 0.92rem;
      font-weight: 500;
      color: var(--text-muted);
      border-radius: var(--radius-sm);
    }
    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--brand-primary);
      background: rgba(37, 99, 235, 0.06);
    }
    .header-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: var(--radius-md);
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      white-space: nowrap;
    }
    .btn-holo {
      background: linear-gradient(135deg, #2563eb, #7c3aed 50%, #ec4899 100%);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(124, 58, 237, 0.3);
    }
    .btn-holo:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(124, 58, 237, 0.45);
      color: #ffffff;
    }
    .btn-outline {
      border: 1px solid var(--border-color);
      background: #ffffff;
      color: var(--text-main);
    }
    .btn-outline:hover {
      border-color: var(--brand-primary);
      color: var(--brand-primary);
      background: rgba(37, 99, 235, 0.04);
      transform: translateY(-2px);
    }
    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
      padding: 4px;
    }
    .section-spacing {
      padding: 80px 0;
      position: relative;
    }
    .section-header {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 52px;
    }
    .section-tag {
      display: inline-block;
      font-size: 0.82rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      padding: 6px 14px;
      border-radius: 999px;
      background: linear-gradient(135deg, rgba(6, 182, 212, 0.12), rgba(236, 72, 153, 0.12));
      color: #0f172a;
      border: 1px solid rgba(139, 92, 246, 0.25);
      margin-bottom: 14px;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.5px;
      margin-bottom: 14px;
    }
    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
      line-height: 1.7;
    }
    .hero-section {
      padding: 90px 0 70px;
      text-align: center;
      position: relative;
      overflow: hidden;
      background: linear-gradient(180deg, rgba(255,255,255,0.7) 0%, rgba(241,245,249,0.5) 100%);
      border-bottom: 1px solid rgba(226, 232, 240, 0.6);
    }
    .hero-holo-glow {
      position: absolute;
      top: -100px;
      left: 50%;
      transform: translateX(-50%);
      width: 700px;
      height: 400px;
      background: radial-gradient(ellipse at center, rgba(6,182,212,0.2) 0%, rgba(236,72,153,0.18) 40%, rgba(139,92,246,0.12) 70%, transparent 80%);
      filter: blur(60px);
      z-index: 0;
      pointer-events: none;
    }
    .hero-content {
      position: relative;
      z-index: 1;
      max-width: 960px;
      margin: 0 auto;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 7px 18px;
      background: rgba(255, 255, 255, 0.95);
      border: 1px solid rgba(139, 92, 246, 0.35);
      border-radius: 999px;
      font-size: 0.88rem;
      color: #1e293b;
      box-shadow: 0 4px 16px rgba(124, 58, 237, 0.1);
      margin-bottom: 24px;
    }
    .hero-badge-pulse {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: #06b6d4;
      box-shadow: 0 0 0 0 rgba(6, 182, 212, 0.7);
      animation: pulseGlow 2s infinite;
    }
    @keyframes pulseGlow {
      0% { box-shadow: 0 0 0 0 rgba(6, 182, 212, 0.7); }
      70% { box-shadow: 0 0 0 8px rgba(6, 182, 212, 0); }
      100% { box-shadow: 0 0 0 0 rgba(6, 182, 212, 0); }
    }
    .hero-title {
      font-size: 2.85rem;
      font-weight: 800;
      line-height: 1.25;
      color: #0f172a;
      letter-spacing: -1px;
      margin-bottom: 20px;
    }
    .hero-lead {
      font-size: 1.18rem;
      color: #334155;
      max-width: 800px;
      margin: 0 auto 36px;
      line-height: 1.8;
    }
    .hero-cta-group {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 50px;
    }
    .hero-btn-main {
      padding: 14px 34px;
      font-size: 1.05rem;
    }
    .hero-stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      padding: 30px;
      background: rgba(255, 255, 255, 0.9);
      border-radius: var(--radius-lg);
      border: 1px solid rgba(226, 232, 240, 0.8);
      box-shadow: 0 10px 30px rgba(15, 23, 42, 0.04);
      position: relative;
    }
    .hero-stats::before {
      content: "";
      position: absolute;
      inset: -1px;
      border-radius: inherit;
      padding: 1px;
      background: var(--border-holo);
      -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
      -webkit-mask-composite: xor;
      mask-composite: exclude;
      pointer-events: none;
    }
    .stat-item h3 {
      font-size: 1.85rem;
      font-weight: 800;
      color: #0f172a;
      margin-bottom: 4px;
    }
    .stat-item p {
      font-size: 0.9rem;
      color: var(--text-light);
    }
    .card-holo {
      background: rgba(255, 255, 255, 0.95);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      padding: 28px;
      transition: var(--transition);
      position: relative;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .card-holo:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-holo);
      border-color: rgba(139, 92, 246, 0.4);
    }
    .models-cloud {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
      margin-top: 24px;
    }
    .model-tag {
      padding: 8px 16px;
      font-size: 0.88rem;
      font-weight: 600;
      color: #1e293b;
      background: #ffffff;
      border-radius: 999px;
      border: 1px solid rgba(203, 213, 225, 0.8);
      box-shadow: 0 2px 6px rgba(0,0,0,0.02);
      transition: var(--transition);
    }
    .model-tag:hover {
      background: linear-gradient(135deg, rgba(6,182,212,0.1), rgba(236,72,153,0.1));
      border-color: var(--holo-violet);
      color: #0f172a;
      transform: scale(1.04);
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .card-icon-wrap {
      width: 52px;
      height: 52px;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      background: linear-gradient(135deg, rgba(37,99,235,0.1), rgba(124,58,237,0.15));
      color: var(--brand-primary);
      font-size: 1.4rem;
      font-weight: bold;
    }
    .card-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: #0f172a;
      margin-bottom: 10px;
    }
    .card-desc {
      font-size: 0.94rem;
      color: var(--text-muted);
      line-height: 1.65;
    }
    .features-list {
      list-style: none;
      margin-top: 16px;
    }
    .features-list li {
      position: relative;
      padding-left: 20px;
      font-size: 0.88rem;
      color: #334155;
      margin-bottom: 8px;
    }
    .features-list li::before {
      content: "✓";
      position: absolute;
      left: 0;
      color: #10b981;
      font-weight: bold;
    }
    .process-step {
      text-align: center;
      padding: 24px;
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      position: relative;
    }
    .step-num {
      width: 44px;
      height: 44px;
      line-height: 44px;
      margin: 0 auto 16px;
      border-radius: 50%;
      background: linear-gradient(135deg, #06b6d4, #7c3aed);
      color: #ffffff;
      font-weight: 800;
      font-size: 1.1rem;
      box-shadow: 0 4px 12px rgba(124, 58, 237, 0.25);
    }
    .table-container {
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .eval-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }
    .eval-table th, .eval-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.94rem;
    }
    .eval-table th {
      background: #f8fafc;
      font-weight: 700;
      color: #0f172a;
    }
    .eval-table tr:hover td {
      background: rgba(248, 250, 252, 0.6);
    }
    .highlight-cell {
      background: rgba(37, 99, 235, 0.04);
      font-weight: 600;
      color: #2563eb;
    }
    .score-badge-card {
      background: linear-gradient(135deg, #eff6ff, #faf5ff);
      border: 1px solid rgba(139, 92, 246, 0.3);
      padding: 24px;
      border-radius: var(--radius-md);
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 24px;
      flex-wrap: wrap;
      gap: 16px;
    }
    .score-big {
      font-size: 2.4rem;
      font-weight: 900;
      color: #0f172a;
      display: flex;
      align-items: baseline;
      gap: 6px;
    }
    .score-stars {
      color: #f59e0b;
      font-size: 1.3rem;
      letter-spacing: 2px;
    }
    .media-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .media-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-holo);
    }
    .media-thumb-box {
      width: 100%;
      overflow: hidden;
      background: #e2e8f0;
      position: relative;
    }
    .media-thumb-box img {
      width: 100%;
      height: auto;
      display: block;
      transition: transform 0.4s ease;
    }
    .media-card:hover .media-thumb-box img {
      transform: scale(1.03);
    }
    .media-body {
      padding: 20px;
    }
    .media-body h4 {
      font-size: 1.1rem;
      font-weight: 700;
      color: #0f172a;
      margin-bottom: 8px;
    }
    .media-body p {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.6;
    }
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .review-card {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      position: relative;
      transition: var(--transition);
    }
    .review-card:hover {
      border-color: rgba(139, 92, 246, 0.4);
      transform: translateY(-4px);
    }
    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }
    .author-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, #e0f2fe, #fce7f3);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      color: #1e293b;
      border: 1px solid var(--border-color);
    }
    .author-meta h5 {
      font-size: 0.98rem;
      font-weight: 700;
      color: #0f172a;
    }
    .author-meta span {
      font-size: 0.82rem;
      color: var(--text-light);
    }
    .review-quote {
      font-size: 0.92rem;
      color: #334155;
      line-height: 1.7;
    }
    .faq-accordion {
      max-width: 900px;
      margin: 0 auto;
    }
    .faq-item {
      background: #ffffff;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
      margin-bottom: 12px;
      overflow: hidden;
      transition: var(--transition);
    }
    .faq-item:hover {
      border-color: rgba(139, 92, 246, 0.35);
    }
    .faq-btn {
      width: 100%;
      padding: 18px 24px;
      background: none;
      border: none;
      text-align: left;
      font-size: 1.02rem;
      font-weight: 600;
      color: #0f172a;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-icon {
      font-size: 1.2rem;
      transition: transform 0.3s ease;
      color: var(--brand-primary);
    }
    .faq-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out, padding 0.3s ease;
      padding: 0 24px;
      background: #fbfcfe;
    }
    .faq-content p {
      padding-bottom: 20px;
      color: var(--text-muted);
      font-size: 0.94rem;
      line-height: 1.7;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    .form-wrapper {
      background: #ffffff;
      padding: 40px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      position: relative;
    }
    .form-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
    }
    .form-group {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    .form-group.full {
      grid-column: span 2;
    }
    .form-group label {
      font-size: 0.9rem;
      font-weight: 600;
      color: #1e293b;
    }
    .form-control {
      padding: 12px 16px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
      font-size: 0.95rem;
      color: #0f172a;
      background: #f8fafc;
      transition: var(--transition);
      outline: none;
      width: 100%;
    }
    .form-control:focus {
      background: #ffffff;
      border-color: var(--brand-primary);
      box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
    }
    textarea.form-control {
      resize: vertical;
      min-height: 120px;
    }
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 20px;
      margin-top: 24px;
    }
    .article-item {
      padding: 20px;
      background: #ffffff;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: var(--transition);
    }
    .article-item:hover {
      border-color: var(--brand-primary);
      transform: translateY(-3px);
      box-shadow: var(--shadow-sm);
    }
    .article-link {
      font-size: 0.96rem;
      font-weight: 600;
      color: #1e293b;
      margin-bottom: 12px;
      display: -webkit-box;
      -webkit-line-clamp: 2;
      -webkit-box-orient: vertical;
      overflow: hidden;
    }
    .article-link:hover {
      color: var(--brand-primary);
    }
    .contact-container {
      display: grid;
      grid-template-columns: 1fr 1.3fr;
      gap: 36px;
      align-items: start;
    }
    .contact-info-card {
      background: #ffffff;
      border-radius: var(--radius-lg);
      padding: 36px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .contact-channel-item {
      display: flex;
      align-items: center;
      gap: 16px;
      padding: 14px 0;
      border-bottom: 1px solid #f1f5f9;
    }
    .contact-channel-item:last-child {
      border-bottom: none;
    }
    .channel-title {
      font-size: 0.88rem;
      color: var(--text-light);
    }
    .channel-val {
      font-size: 1.02rem;
      font-weight: 600;
      color: #0f172a;
    }
    .qr-wrapper {
      margin-top: 20px;
      padding: 20px;
      background: #f8fafc;
      border-radius: var(--radius-md);
      text-align: center;
      border: 1px dashed rgba(139, 92, 246, 0.3);
    }
    .qr-wrapper img {
      width: 140px;
      height: 140px;
      margin: 0 auto 10px;
      display: block;
      border-radius: 8px;
      background: #fff;
      padding: 4px;
      border: 1px solid #e2e8f0;
    }
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px;
      border-top: 1px solid #1e293b;
    }
    .footer-content {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-col h5 {
      color: #ffffff;
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 18px;
    }
    .footer-links {
      list-style: none;
    }
    .footer-links li {
      margin-bottom: 10px;
    }
    .footer-links a {
      color: #94a3b8;
      font-size: 0.9rem;
    }
    .footer-links a:hover {
      color: #ffffff;
      padding-left: 4px;
    }
    .friendly-links-bar {
      padding-top: 24px;
      border-top: 1px solid #1e293b;
      margin-bottom: 24px;
      font-size: 0.88rem;
    }
    .friendly-links-bar span {
      color: #cbd5e1;
      margin-right: 12px;
      font-weight: 600;
    }
    .friendly-links-bar a {
      color: #94a3b8;
      margin-right: 16px;
      display: inline-block;
      margin-bottom: 6px;
    }
    .friendly-links-bar a:hover {
      color: #38bdf8;
    }
    .footer-bottom {
      text-align: center;
      padding-top: 20px;
      border-top: 1px solid rgba(255, 255, 255, 0.05);
      font-size: 0.85rem;
      color: #64748b;
    }
    .floating-tools {
      position: fixed;
      right: 20px;
      bottom: 30px;
      display: flex;
      flex-direction: column;
      gap: 10px;
      z-index: 999;
    }
    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      border: 1px solid var(--border-color);
      box-shadow: 0 4px 16px rgba(0,0,0,0.1);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      color: #0f172a;
      transition: var(--transition);
      font-size: 1.1rem;
    }
    .float-btn:hover {
      background: var(--brand-primary);
      color: #ffffff;
      transform: translateY(-3px);
    }
    @media (max-width: 1024px) {
      .grid-3, .reviews-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-4, .hero-stats {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-content {
        grid-template-columns: 1fr 1fr;
      }
      .contact-container {
        grid-template-columns: 1fr;
      }
    }
    @media (max-width: 768px) {
      .hero-title {
        font-size: 2.1rem;
      }
      .grid-3, .grid-2, .reviews-grid, .grid-4 {
        grid-template-columns: 1fr;
      }
      .form-grid {
        grid-template-columns: 1fr;
      }
      .form-group.full {
        grid-column: span 1;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .nav-menu {
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        border-bottom: 1px solid var(--border-color);
        padding: 20px;
        display: none;
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
      }
      .nav-menu.active {
        display: block;
      }
      .nav-links {
        flex-direction: column;
        align-items: flex-start;
        width: 100%;
      }
      .nav-links li {
        width: 100%;
      }
      .nav-links li a {
        padding: 10px 0;
        width: 100%;
      }
      .header-actions .btn-outline {
        display: none;
      }
      .footer-content {
        grid-template-columns: 1fr;
      }
    }