:root {
      --primary: #1e3a8a;
      --primary-dark: #0f172a;
      --accent: #ff5722;
      --accent-hover: #f4511e;
      --contrast: #00b4d8;
      --highlight: #f59e0b;
      --bg-page: #f8fafc;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --border-color: #e2e8f0;
      --container-width: 1200px;
      --radius: 12px;
      --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.05);
      --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.08);
      --shadow-lg: 0 16px 36px rgba(15, 23, 42, 0.12);
      --transition: all 0.28s ease-in-out;
    }

    * {
      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, sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    a {
      color: inherit;
      text-decoration: none;
    }

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

    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background-color: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
    }

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

    .brand-area {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .ai-page-logo {
      height: 38px;
      width: auto;
      display: block;
    }

    .brand-title {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--primary);
      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 a {
      display: inline-block;
      padding: 8px 14px;
      font-size: 0.925rem;
      font-weight: 600;
      color: var(--text-muted);
      transition: var(--transition);
      border-radius: 6px;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent);
      background-color: rgba(255, 87, 34, 0.08);
    }

    .nav-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: 700;
      border-radius: 8px;
      cursor: pointer;
      transition: var(--transition);
      border: 1px solid transparent;
      text-align: center;
    }

    .btn-primary {
      background-color: var(--accent);
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(255, 87, 34, 0.28);
    }

    .btn-primary:hover {
      background-color: var(--accent-hover);
      transform: translateY(-2px);
      box-shadow: 0 6px 16px rgba(255, 87, 34, 0.36);
    }

    .btn-outline {
      border-color: var(--primary);
      color: var(--primary);
      background: transparent;
    }

    .btn-outline:hover {
      background-color: var(--primary);
      color: #ffffff;
    }

    .btn-contrast {
      background-color: var(--contrast);
      color: #ffffff;
    }

    .btn-contrast:hover {
      filter: brightness(0.92);
      transform: translateY(-2px);
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
      padding: 4px;
    }

    .hero-section {
      position: relative;
      padding: 72px 0 60px;
      background: linear-gradient(135deg, #ffffff 0%, #f0f7ff 60%, #fff7ed 100%);
      border-bottom: 1px solid var(--border-color);
      overflow: hidden;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 14px;
      background-color: rgba(255, 87, 34, 0.1);
      color: var(--accent);
      font-size: 0.85rem;
      font-weight: 700;
      border-radius: 20px;
      margin-bottom: 20px;
      border: 1px solid rgba(255, 87, 34, 0.25);
    }

    .hero-badge-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background-color: var(--accent);
      box-shadow: 0 0 8px var(--accent);
    }

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

    .hero-title {
      font-size: 2.75rem;
      font-weight: 900;
      line-height: 1.25;
      color: var(--primary-dark);
      margin-bottom: 18px;
      letter-spacing: -1px;
    }

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 32px;
      max-width: 760px;
      margin-left: auto;
      margin-right: auto;
    }

    .hero-cta-group {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 44px;
    }

    .hero-metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 16px;
    }

    .metric-card {
      background: var(--bg-card);
      padding: 20px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: var(--transition);
    }

    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--contrast);
    }

    .metric-number {
      font-size: 1.85rem;
      font-weight: 900;
      color: var(--accent);
      line-height: 1.2;
    }

    .metric-label {
      font-size: 0.875rem;
      color: var(--text-muted);
      margin-top: 4px;
      font-weight: 500;
    }

    .section {
      padding: 64px 0;
      position: relative;
    }

    .section-alt {
      background-color: #f1f5f9;
    }

    .section-header {
      text-align: center;
      max-width: 720px;
      margin: 0 auto 44px;
    }

    .section-tag {
      display: inline-block;
      font-size: 0.825rem;
      font-weight: 800;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: var(--contrast);
      margin-bottom: 8px;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 800;
      color: var(--primary-dark);
      line-height: 1.3;
      margin-bottom: 12px;
    }

    .section-subtitle {
      font-size: 1rem;
      color: var(--text-muted);
    }

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
      align-items: stretch;
    }

    .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-card);
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

    .card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }

    .card-accent-top {
      border-top: 4px solid var(--accent);
    }

    .card-contrast-top {
      border-top: 4px solid var(--contrast);
    }

    .card-icon {
      width: 44px;
      height: 44px;
      border-radius: 10px;
      background-color: rgba(30, 58, 138, 0.08);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.25rem;
      margin-bottom: 16px;
      color: var(--primary);
      font-weight: bold;
    }

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

    .card-text {
      font-size: 0.925rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    .model-badge-container {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 24px;
      justify-content: center;
    }

    .model-badge {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--primary);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .model-badge:hover {
      background-color: var(--primary);
      color: #ffffff;
      transform: scale(1.05);
    }

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

    .step-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px 20px;
      position: relative;
    }

    .step-number {
      display: inline-block;
      font-size: 0.8rem;
      font-weight: 900;
      color: var(--accent);
      background: rgba(255, 87, 34, 0.1);
      padding: 4px 10px;
      border-radius: 12px;
      margin-bottom: 12px;
    }

    .table-container {
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      overflow-x: auto;
      margin-top: 20px;
    }

    .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 var(--border-color);
    }

    .custom-table th {
      background-color: #f8fafc;
      font-weight: 700;
      color: var(--primary-dark);
    }

    .custom-table tr:last-child td {
      border-bottom: none;
    }

    .highlight-col {
      background-color: rgba(0, 180, 216, 0.05);
      font-weight: 700;
      color: var(--primary);
    }

    .score-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: linear-gradient(135deg, #ff5722 0%, #ff9800 100%);
      color: #ffffff;
      font-weight: 800;
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 0.95rem;
    }

    .faq-container {
      max-width: 920px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

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

    .faq-question {
      padding: 18px 24px;
      font-weight: 700;
      font-size: 1.05rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      user-select: none;
      color: var(--primary-dark);
    }

    .faq-question:hover {
      color: var(--accent);
    }

    .faq-icon {
      font-size: 1.2rem;
      transition: transform 0.28s ease;
      color: var(--accent);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out, padding 0.3s ease;
      background-color: #fafbfc;
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.7;
    }

    .faq-item.active .faq-answer {
      max-height: 280px;
      padding: 16px 24px 22px;
      border-top: 1px solid var(--border-color);
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

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

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

    .review-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background-color: rgba(0, 180, 216, 0.15);
      color: var(--primary);
      font-weight: 800;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1rem;
    }

    .review-author {
      font-weight: 700;
      font-size: 0.95rem;
      color: var(--primary-dark);
    }

    .review-role {
      font-size: 0.825rem;
      color: var(--text-muted);
    }

    .review-text {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
    }

    .review-stars {
      color: #f59e0b;
      font-size: 0.9rem;
    }

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

    .media-card-img-wrap {
      width: 100%;
      overflow: hidden;
      background: #e2e8f0;
    }

    .media-card-img-wrap img {
      width: 100%;
      height: auto;
      display: block;
      transition: transform 0.4s ease;
    }

    .media-card:hover .media-card-img-wrap img {
      transform: scale(1.03);
    }

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

    .form-box {
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      padding: 32px;
      box-shadow: var(--shadow-md);
    }

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

    .form-label {
      display: block;
      font-weight: 700;
      font-size: 0.925rem;
      margin-bottom: 8px;
      color: var(--primary-dark);
    }

    .form-input,
    .form-select,
    .form-textarea {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 0.95rem;
      color: var(--text-main);
      background-color: #fafbfc;
      transition: var(--transition);
      outline: none;
    }

    .form-input:focus,
    .form-select:focus,
    .form-textarea:focus {
      border-color: var(--contrast);
      background-color: #ffffff;
      box-shadow: 0 0 0 3px rgba(0, 180, 216, 0.15);
    }

    .contact-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .contact-item {
      display: flex;
      align-items: flex-start;
      gap: 14px;
    }

    .contact-icon {
      width: 36px;
      height: 36px;
      border-radius: 8px;
      background: rgba(30, 58, 138, 0.08);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-weight: bold;
      flex-shrink: 0;
    }

    .contact-info-title {
      font-weight: 700;
      font-size: 0.9rem;
      color: var(--primary-dark);
    }

    .contact-info-val {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    .qr-container {
      width: 130px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      padding: 8px;
      background: #ffffff;
      margin-top: 10px;
    }

    .qr-container img {
      width: 100%;
      height: auto;
      display: block;
    }

    .article-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .article-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      padding: 16px 20px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: var(--transition);
    }

    .article-item:hover {
      border-color: var(--contrast);
      transform: translateX(4px);
    }

    .article-link {
      font-weight: 600;
      color: var(--primary-dark);
      font-size: 0.95rem;
    }

    .article-link:hover {
      color: var(--accent);
    }

    .site-footer {
      background-color: #0f172a;
      color: #94a3b8;
      padding: 48px 0 24px;
      font-size: 0.9rem;
      border-top: 1px solid #1e293b;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
      margin-bottom: 36px;
    }

    .footer-brand {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .footer-title {
      color: #ffffff;
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 12px;
    }

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

    .footer-links a {
      color: #94a3b8;
      transition: var(--transition);
    }

    .footer-links a:hover {
      color: #ffffff;
    }

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      text-align: center;
      font-size: 0.85rem;
      color: #64748b;
    }

    .friend-links-box {
      margin-top: 16px;
      padding-top: 16px;
      border-top: 1px solid #1e293b;
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      justify-content: center;
      font-size: 0.85rem;
    }

    .friend-links-box a {
      color: #94a3b8;
      transition: var(--transition);
    }

    .friend-links-box a:hover {
      color: #ffffff;
    }

    .float-widget {
      position: fixed;
      right: 20px;
      bottom: 24px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--accent);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: var(--shadow-lg);
      cursor: pointer;
      transition: var(--transition);
      border: none;
      font-size: 1.1rem;
    }

    .float-btn:hover {
      transform: scale(1.08);
      background-color: var(--accent-hover);
    }

    @media (max-width: 992px) {
      .hero-title {
        font-size: 2.15rem;
      }
      .grid-4, .steps-container {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3, .reviews-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-metrics-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .menu-toggle {
        display: block;
      }
      .nav-menu {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background-color: #ffffff;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
        padding: 20px;
      }
      .nav-menu.show {
        display: block;
      }
      .nav-links {
        flex-direction: column;
        align-items: flex-start;
      }
      .nav-links a {
        width: 100%;
        padding: 10px 0;
      }
      .nav-actions {
        display: none;
      }
      .hero-title {
        font-size: 1.85rem;
      }
      .grid-2, .grid-3, .grid-4, .reviews-grid, .steps-container {
        grid-template-columns: 1fr;
      }
      .hero-metrics-grid {
        grid-template-columns: 1fr 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }