:root {
      --primary: #4f46e5;
      --primary-gradient: linear-gradient(135deg, #4f46e5 0%, #06b6d4 100%);
      --accent-gradient: linear-gradient(135deg, #f43f5e 0%, #fb923c 100%);
      --hero-bg: linear-gradient(145deg, #f8fafc 0%, #e0e7ff 50%, #f0fdf4 100%);
      --text-main: #0f172a;
      --text-muted: #475569;
      --card-bg: #ffffff;
      --card-border: rgba(226, 232, 240, 0.8);
      --card-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.03);
      --container-max: 1200px;
      --radius: 12px;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
      background-color: #f8fafc;
      color: var(--text-main);
      line-height: 1.6;
    }
    body {
      background: linear-gradient(180deg, #f8fafc 0%, #f1f5f9 100%);
      min-height: 100vh;
      display: flex;
      flex-direction: column;
    }
    a {
      color: var(--primary);
      text-decoration: none;
      transition: all 0.25s ease;
    }
    a:hover {
      opacity: 0.85;
    }
    .site-container {
      width: 100%;
      max-width: var(--container-max);
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    .header-nav {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(226, 232, 240, 0.8);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
    }
    .brand-group {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .brand-group .ai-page-logo {
      height: 38px;
      width: auto;
      display: block;
    }
    .brand-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: #1e1b4b;
      letter-spacing: -0.5px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }
    .nav-links li a {
      color: var(--text-muted);
      font-size: 0.95rem;
      font-weight: 500;
      padding: 6px 12px;
      border-radius: 6px;
      display: inline-block;
    }
    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--primary);
      background-color: #eef2ff;
    }
    .nav-action {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn-main {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 20px;
      border-radius: 8px;
      background: var(--primary-gradient);
      color: #ffffff !important;
      font-weight: 600;
      font-size: 0.95rem;
      border: none;
      cursor: pointer;
      box-shadow: 0 4px 14px rgba(79, 70, 229, 0.3);
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }
    .btn-main:hover {
      transform: translateY(-1px);
      box-shadow: 0 6px 20px rgba(79, 70, 229, 0.4);
    }
    .btn-outline {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 20px;
      border-radius: 8px;
      background: #ffffff;
      color: var(--primary) !important;
      font-weight: 600;
      font-size: 0.95rem;
      border: 1px solid #cbd5e1;
      cursor: pointer;
      transition: all 0.2s ease;
    }
    .btn-outline:hover {
      border-color: var(--primary);
      background: #eef2ff;
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
    }
    .hero-section {
      background: var(--hero-bg);
      padding: 80px 0 60px 0;
      border-bottom: 1px solid rgba(226, 232, 240, 0.6);
      text-align: center;
      position: relative;
      overflow: hidden;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: rgba(255, 255, 255, 0.8);
      border: 1px solid #c7d2fe;
      border-radius: 999px;
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 24px;
      box-shadow: 0 2px 8px rgba(79, 70, 229, 0.08);
    }
    .hero-h1 {
      font-size: 2.75rem;
      font-weight: 800;
      line-height: 1.25;
      color: #0f172a;
      margin-bottom: 20px;
      letter-spacing: -0.02em;
    }
    .hero-lead {
      max-width: 820px;
      margin: 0 auto 36px auto;
      font-size: 1.15rem;
      color: var(--text-muted);
      line-height: 1.7;
    }
    .hero-cta-group {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }
    .btn-large-official {
      padding: 14px 34px;
      font-size: 1.1rem;
      background: var(--accent-gradient);
      color: #ffffff !important;
      border-radius: 10px;
      font-weight: 700;
      box-shadow: 0 8px 24px rgba(244, 63, 94, 0.35);
      border: none;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-large-official:hover {
      transform: translateY(-2px);
      box-shadow: 0 12px 28px rgba(244, 63, 94, 0.45);
    }
    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      max-width: 980px;
      margin: 0 auto;
    }
    .hero-stat-card {
      background: rgba(255, 255, 255, 0.85);
      backdrop-filter: blur(8px);
      border: 1px solid var(--card-border);
      padding: 20px;
      border-radius: var(--radius);
      box-shadow: var(--card-shadow);
      text-align: center;
    }
    .hero-stat-num {
      font-size: 1.85rem;
      font-weight: 800;
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      margin-bottom: 4px;
    }
    .hero-stat-label {
      font-size: 0.88rem;
      color: var(--text-muted);
      font-weight: 500;
    }
    .section-block {
      padding: 70px 0;
    }
    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 50px auto;
    }
    .section-tag {
      font-size: 0.82rem;
      font-weight: 700;
      letter-spacing: 1px;
      text-transform: uppercase;
      color: var(--primary);
      margin-bottom: 8px;
      display: block;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: #0f172a;
      margin-bottom: 14px;
    }
    .section-desc {
      font-size: 1rem;
      color: var(--text-muted);
    }
    .cards-grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .cards-grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .cards-grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
    }
    .info-card {
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: var(--radius);
      padding: 28px;
      box-shadow: var(--card-shadow);
      transition: transform 0.25s ease, box-shadow 0.25s ease;
      display: flex;
      flex-direction: column;
    }
    .info-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 15px 30px rgba(0, 0, 0, 0.08);
    }
    .card-icon-pill {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: #e0e7ff;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.25rem;
      margin-bottom: 18px;
      font-weight: 700;
    }
    .card-title {
      font-size: 1.2rem;
      font-weight: 700;
      margin-bottom: 12px;
      color: #1e293b;
    }
    .card-text {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }
    .models-badge-wall {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 30px;
    }
    .model-badge {
      padding: 8px 16px;
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: 30px;
      font-size: 0.85rem;
      font-weight: 600;
      color: #334155;
      box-shadow: 0 2px 4px rgba(0, 0, 0, 0.02);
      transition: all 0.2s ease;
    }
    .model-badge:hover {
      border-color: var(--primary);
      color: var(--primary);
      transform: translateY(-1px);
    }
    .table-container {
      background: #ffffff;
      border: 1px solid var(--card-border);
      border-radius: var(--radius);
      overflow-x: auto;
      box-shadow: var(--card-shadow);
    }
    .custom-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.95rem;
    }
    .custom-table th,
    .custom-table td {
      padding: 16px 20px;
      border-bottom: 1px solid #f1f5f9;
    }
    .custom-table th {
      background-color: #f8fafc;
      font-weight: 700;
      color: #1e293b;
    }
    .custom-table tr:last-child td {
      border-bottom: none;
    }
    .highlight-cell {
      color: var(--primary);
      font-weight: 700;
    }
    .rating-badge {
      display: inline-block;
      padding: 4px 10px;
      border-radius: 6px;
      background: #fef2f2;
      color: #ef4444;
      font-weight: 700;
      font-size: 0.85rem;
    }
    .media-box {
      border-radius: var(--radius);
      overflow: hidden;
      border: 1px solid var(--card-border);
      box-shadow: var(--card-shadow);
      background: #ffffff;
    }
    .media-box img {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
    }
    .media-content {
      padding: 20px;
    }
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--card-border);
      border-radius: 8px;
      overflow: hidden;
      transition: border-color 0.2s ease;
    }
    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      font-size: 1rem;
      color: #1e293b;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }
    .faq-question:hover {
      color: var(--primary);
    }
    .faq-answer {
      display: none;
      padding: 0 24px 20px 24px;
      color: var(--text-muted);
      font-size: 0.93rem;
      line-height: 1.65;
      border-top: 1px dashed #f1f5f9;
      padding-top: 14px;
    }
    .faq-item.open .faq-answer {
      display: block;
    }
    .faq-item.open .faq-toggle-icon {
      transform: rotate(180deg);
    }
    .faq-toggle-icon {
      transition: transform 0.2s ease;
      font-size: 0.85rem;
      color: #94a3b8;
    }
    .form-wrapper {
      background: #ffffff;
      border: 1px solid var(--card-border);
      border-radius: var(--radius);
      padding: 36px;
      box-shadow: var(--card-shadow);
    }
    .form-group {
      margin-bottom: 20px;
    }
    .form-label {
      display: block;
      margin-bottom: 8px;
      font-weight: 600;
      font-size: 0.92rem;
      color: #334155;
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      border-radius: 8px;
      border: 1px solid #cbd5e1;
      font-size: 0.95rem;
      transition: border-color 0.2s ease, box-shadow 0.2s ease;
      background-color: #f8fafc;
      color: #0f172a;
    }
    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      background-color: #ffffff;
      box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
    }
    textarea.form-control {
      resize: vertical;
      min-height: 110px;
    }
    .site-footer {
      background-color: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px 0;
      margin-top: auto;
      border-top: 1px solid #1e293b;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.2fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      color: #f8fafc;
      font-size: 1.05rem;
      margin-bottom: 18px;
      font-weight: 600;
    }
    .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;
    }
    .friend-links-box {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      margin-bottom: 24px;
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      align-items: center;
      font-size: 0.88rem;
    }
    .friend-links-box a {
      color: #94a3b8;
    }
    .friend-links-box a:hover {
      color: #38bdf8;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 24px;
      text-align: center;
      font-size: 0.85rem;
      color: #64748b;
    }
    .floating-contact {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .floating-btn {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: var(--primary);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 6px 18px rgba(79, 70, 229, 0.35);
      cursor: pointer;
      position: relative;
    }
    .floating-qr {
      position: absolute;
      right: 60px;
      bottom: 0;
      background: #ffffff;
      padding: 12px;
      border-radius: 8px;
      box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
      display: none;
      width: 140px;
      text-align: center;
    }
    .floating-qr img {
      width: 100%;
      height: auto;
      display: block;
      border-radius: 4px;
    }
    .floating-qr p {
      font-size: 0.75rem;
      color: #475569;
      margin-top: 6px;
    }
    .floating-btn:hover .floating-qr {
      display: block;
    }
    .article-pills {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 16px;
    }
    .article-pill-item {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      padding: 10px 18px;
      border-radius: 8px;
      font-size: 0.9rem;
      color: #334155;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .article-pill-item:hover {
      border-color: var(--primary);
      color: var(--primary);
    }
    @media (max-width: 992px) {
      .cards-grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .cards-grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 768px) {
      .hero-h1 {
        font-size: 1.9rem;
      }
      .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .cards-grid-3,
      .cards-grid-2,
      .cards-grid-4 {
        grid-template-columns: 1fr;
      }
      .menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: #ffffff;
        padding: 20px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.08);
        border-bottom: 1px solid #e2e8f0;
      }
      .nav-links.active {
        display: flex;
      }
      .nav-action .btn-outline {
        display: none;
      }
      .footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
      }
    }