:root {
      --primary: #4f46e5;
      --primary-hover: #4338ca;
      --secondary: #ec4899;
      --accent: #06b6d4;
      --accent-warm: #f59e0b;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --bg-base: #f8fafc;
      --bg-surface: #ffffff;
      --border-light: #e2e8f0;
      --shadow-sm: 0 1px 2px 0 rgba(0,0,0,0.05);
      --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
      --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --max-width: 1200px;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      background-color: var(--bg-base);
      color: var(--text-main);
      line-height: 1.6;
    }

    body {
      overflow-x: hidden;
      display: flex;
      flex-direction: column;
      min-height: 100vh;
    }

    .container {
      width: 100%;
      max-width: var(--max-width);
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    header {
      position: sticky;
      top: 0;
      z-index: 100;
      background-color: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .brand {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
      color: var(--text-main);
    }

    .ai-page-logo {
      height: 40px;
      width: auto;
      display: block;
      object-fit: contain;
    }

    .brand-title {
      font-size: 1.25rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 0;
    }

    .nav-links a {
      text-decoration: none;
      color: var(--text-muted);
      font-size: 0.95rem;
      font-weight: 600;
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      transition: color 0.2s, background-color 0.2s;
    }

    .nav-links a:hover,
    .nav-links a:focus {
      color: var(--primary);
      background-color: #f1f5f9;
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .btn-portal {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 20px;
      font-size: 0.95rem;
      font-weight: 700;
      color: #ffffff;
      background: linear-gradient(135deg, var(--primary), #6366f1);
      border: none;
      border-radius: var(--radius-sm);
      text-decoration: none;
      box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
      transition: transform 0.15s, box-shadow 0.15s;
    }

    .btn-portal:hover {
      transform: translateY(-1px);
      box-shadow: 0 6px 16px rgba(79, 70, 229, 0.35);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: 1px solid var(--border-light);
      padding: 8px;
      border-radius: var(--radius-sm);
      cursor: pointer;
    }

    .mobile-menu-btn svg {
      display: block;
      width: 24px;
      height: 24px;
      stroke: var(--text-main);
    }

    .hero-section {
      background: linear-gradient(135deg, #e0e7ff 0%, #fae8ff 50%, #e0f2fe 100%);
      padding: 80px 0 90px;
      border-bottom: 1px solid var(--border-light);
      position: relative;
    }

    .hero-content {
      text-align: center;
      max-width: 860px;
      margin: 0 auto;
    }

    .hero-tag {
      display: inline-flex;
      align-items: center;
      padding: 6px 16px;
      background-color: #ffffff;
      color: var(--primary);
      font-weight: 700;
      font-size: 0.85rem;
      border-radius: 999px;
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
      border: 1px solid rgba(79, 70, 229, 0.2);
    }

    .hero-title {
      font-size: 2.75rem;
      font-weight: 900;
      line-height: 1.25;
      margin-bottom: 20px;
      color: var(--text-main);
      letter-spacing: -1px;
    }

    .hero-title-gradient {
      background: linear-gradient(90deg, #4f46e5, #d946ef);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 36px;
    }

    .hero-buttons {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-hero-primary {
      padding: 14px 32px;
      font-size: 1.05rem;
      font-weight: 700;
      color: #ffffff;
      background: linear-gradient(135deg, var(--secondary), #db2777);
      border-radius: var(--radius-md);
      text-decoration: none;
      box-shadow: 0 10px 20px rgba(236, 72, 153, 0.3);
      transition: transform 0.2s, box-shadow 0.2s;
    }

    .btn-hero-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 12px 24px rgba(236, 72, 153, 0.4);
    }

    .btn-hero-secondary {
      padding: 14px 28px;
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-main);
      background-color: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      text-decoration: none;
      transition: background-color 0.2s, border-color 0.2s;
    }

    .btn-hero-secondary:hover {
      background-color: #f8fafc;
      border-color: #cbd5e1;
    }

    .stats-bar {
      margin-top: 50px;
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .stat-card {
      background-color: rgba(255, 255, 255, 0.85);
      border: 1px solid rgba(255, 255, 255, 0.6);
      backdrop-filter: blur(4px);
      padding: 20px;
      border-radius: var(--radius-md);
      text-align: center;
      box-shadow: var(--shadow-sm);
    }

    .stat-val {
      font-size: 1.85rem;
      font-weight: 900;
      color: var(--primary);
      margin-bottom: 4px;
    }

    .stat-label {
      font-size: 0.9rem;
      color: var(--text-muted);
      font-weight: 600;
    }

    section {
      padding: 70px 0;
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 50px;
    }

    .section-eyebrow {
      font-size: 0.85rem;
      font-weight: 800;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: var(--secondary);
      margin-bottom: 8px;
      display: block;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 12px;
      letter-spacing: -0.5px;
    }

    .section-desc {
      font-size: 1rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    .grid-2 {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      align-items: center;
    }

    .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-color: var(--bg-surface);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: transform 0.2s, box-shadow 0.2s;
    }

    .card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
    }

    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: var(--radius-sm);
      background: linear-gradient(135deg, #e0e7ff, #fae8ff);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 18px;
      color: var(--primary);
    }

    .card-icon svg {
      width: 24px;
      height: 24px;
      stroke-width: 2;
    }

    .card-title {
      font-size: 1.2rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }

    .card-text {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    .models-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 30px;
    }

    .model-chip {
      background-color: #ffffff;
      border: 1px solid var(--border-light);
      padding: 8px 16px;
      border-radius: 999px;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
      display: inline-flex;
      align-items: center;
      gap: 6px;
      box-shadow: 0 1px 3px rgba(0,0,0,0.03);
    }

    .model-chip::before {
      content: "";
      display: inline-block;
      width: 6px;
      height: 6px;
      background-color: var(--accent);
      border-radius: 50%;
    }

    .table-container {
      width: 100%;
      overflow-x: auto;
      background-color: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }

    .compare-table th,
    .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-light);
    }

    .compare-table th {
      background-color: #f8fafc;
      font-weight: 700;
      color: var(--text-main);
      font-size: 0.95rem;
    }

    .compare-table td {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    .highlight-col {
      background-color: #f0fdf4;
      color: #166534;
      font-weight: 700;
    }

    .rating-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: linear-gradient(135deg, #fef3c7, #fde68a);
      color: #92400e;
      padding: 6px 14px;
      border-radius: 999px;
      font-size: 0.95rem;
      font-weight: 800;
      margin-bottom: 16px;
    }

    .timeline {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }

    .step-card {
      background-color: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 24px;
      position: relative;
    }

    .step-num {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: var(--primary);
      color: #ffffff;
      font-weight: 800;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 14px;
      font-size: 1rem;
    }

    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .faq-item {
      background-color: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      overflow: hidden;
    }

    .faq-question {
      width: 100%;
      text-align: left;
      padding: 18px 24px;
      background: none;
      border: none;
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .faq-question:hover {
      background-color: #f8fafc;
    }

    .faq-answer {
      display: none;
      padding: 0 24px 20px;
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    .faq-icon {
      transition: transform 0.2s;
    }

    .faq-item.active .faq-icon {
      transform: rotate(180deg);
    }

    .media-card {
      background-color: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .media-card img {
      width: 100%;
      height: 220px;
      object-fit: cover;
      display: block;
    }

    .media-card-body {
      padding: 20px;
    }

    .form-wrapper {
      max-width: 640px;
      margin: 0 auto;
      background-color: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-md);
    }

    .form-group {
      margin-bottom: 20px;
    }

    .form-label {
      display: block;
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      color: var(--text-main);
      background-color: #f8fafc;
      transition: border-color 0.2s, background-color 0.2s;
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      background-color: #ffffff;
    }

    textarea.form-control {
      resize: vertical;
      min-height: 110px;
    }

    .btn-submit {
      width: 100%;
      padding: 14px;
      font-size: 1rem;
      font-weight: 800;
      color: #ffffff;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      border: none;
      border-radius: var(--radius-sm);
      cursor: pointer;
      box-shadow: 0 4px 14px rgba(79, 70, 229, 0.3);
      transition: opacity 0.2s;
    }

    .btn-submit:hover {
      opacity: 0.95;
    }

    .review-card {
      background-color: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .review-header {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }

    .avatar-placeholder {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      color: #ffffff;
      font-weight: 800;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .review-name {
      font-weight: 700;
      color: var(--text-main);
      font-size: 0.95rem;
    }

    .review-role {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    .review-content {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    .contact-bar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
      background: linear-gradient(135deg, #1e1b4b, #312e81);
      color: #ffffff;
      padding: 36px;
      border-radius: var(--radius-lg);
      margin-top: 40px;
    }

    .contact-info-list {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .contact-info-item {
      font-size: 0.95rem;
      color: #e2e8f0;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .qr-box {
      background-color: #ffffff;
      padding: 10px;
      border-radius: var(--radius-sm);
      text-align: center;
      color: var(--text-main);
    }

    .qr-box img {
      width: 120px;
      height: 120px;
      display: block;
      margin-bottom: 4px;
    }

    .qr-box span {
      font-size: 0.75rem;
      font-weight: 700;
      color: var(--text-muted);
    }

    footer {
      background-color: #ffffff;
      border-top: 1px solid var(--border-light);
      padding: 40px 0 24px;
      margin-top: auto;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 30px;
    }

    .footer-col h4 {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 14px;
    }

    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .footer-links a {
      text-decoration: none;
      color: var(--text-muted);
      font-size: 0.85rem;
      transition: color 0.15s;
    }

    .footer-links a:hover {
      color: var(--primary);
    }

    .footer-bottom {
      border-top: 1px solid var(--border-light);
      padding-top: 20px;
      text-align: center;
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 10px;
      justify-content: center;
    }

    .friend-links a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 0.85rem;
    }

    .friend-links a:hover {
      color: var(--primary);
    }

    .articles-group {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 8px;
    }

    .article-link {
      color: var(--primary);
      text-decoration: none;
      font-size: 0.85rem;
      background: #eef2ff;
      padding: 4px 8px;
      border-radius: var(--radius-sm);
    }

    .article-link:hover {
      text-decoration: underline;
    }

    .float-panel {
      position: fixed;
      right: 20px;
      bottom: 30px;
      display: flex;
      flex-direction: column;
      gap: 10px;
      z-index: 99;
    }

    .float-btn {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background-color: #ffffff;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      cursor: pointer;
      text-decoration: none;
      transition: background-color 0.2s, transform 0.2s;
    }

    .float-btn:hover {
      background-color: #f1f5f9;
      transform: translateY(-2px);
    }

    @media (max-width: 1024px) {
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .timeline {
        grid-template-columns: repeat(2, 1fr);
      }
      .stats-bar {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .hero-title {
        font-size: 2rem;
      }
      .grid-2, .grid-3 {
        grid-template-columns: 1fr;
      }
      .mobile-menu-btn {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background-color: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-light);
        box-shadow: var(--shadow-md);
      }
      .nav-links.show {
        display: flex;
      }
      .nav-actions {
        display: none;
      }
      .contact-bar {
        flex-direction: column;
        text-align: center;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }