:root {
      --primary: #2563eb;
      --primary-light: #3b82f6;
      --primary-dark: #1d4ed8;
      --accent: #f97316;
      --accent-gradient: linear-gradient(135deg, #2563eb 0%, #7c3aed 50%, #f43f5e 100%);
      --bg-gradient: linear-gradient(180deg, #f8fafc 0%, #eef2ff 30%, #fdf4ff 70%, #f8fafc 100%);
      --surface: #ffffff;
      --surface-alt: #f1f5f9;
      --text-main: #0f172a;
      --text-muted: #475569;
      --border-color: #e2e8f0;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
      --shadow-md: 0 4px 20px rgba(37,99,235,0.08);
      --shadow-lg: 0 10px 30px rgba(0,0,0,0.08);
      --radius: 12px;
      --radius-lg: 20px;
    }

    * {
      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;
      color: var(--text-main);
      background: var(--bg-gradient);
      line-height: 1.6;
      overflow-x: hidden;
      min-height: 100vh;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: all 0.25s ease;
    }

    ul, ol {
      list-style: none;
    }

    .container {
      width: 100%;
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

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

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

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

    .brand-name {
      font-size: 1.25rem;
      font-weight: 800;
      color: #0f172a;
      letter-spacing: -0.5px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
    }

    .nav-links a {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-muted);
      padding: 8px 12px;
      border-radius: 6px;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
      background: #eff6ff;
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      padding: 10px 22px;
      border-radius: 30px;
      transition: all 0.25s ease;
      cursor: pointer;
      border: 1px solid transparent;
      font-size: 0.95rem;
      text-align: center;
    }

    .btn-primary {
      background: linear-gradient(135deg, #2563eb, #7c3aed);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(37,99,235,0.3);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(37,99,235,0.45);
      color: #ffffff;
    }

    .btn-outline {
      background: #ffffff;
      border-color: #cbd5e1;
      color: var(--text-main);
    }

    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: #eff6ff;
    }

    .menu-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      padding: 8px;
    }

    .menu-toggle span {
      width: 24px;
      height: 2px;
      background: var(--text-main);
      transition: 0.3s;
    }

    .hero-section {
      padding: 70px 0 50px;
      text-align: center;
      position: relative;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: #eff6ff;
      border: 1px solid #bfdbfe;
      border-radius: 20px;
      color: var(--primary-dark);
      font-size: 0.88rem;
      font-weight: 600;
      margin-bottom: 24px;
    }

    .hero-badge .dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: #10b981;
      box-shadow: 0 0 8px #10b981;
    }

    .hero-title {
      font-size: 2.75rem;
      line-height: 1.25;
      font-weight: 900;
      color: #0f172a;
      margin-bottom: 20px;
      letter-spacing: -0.02em;
    }

    .hero-title .text-gradient {
      background: var(--accent-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 820px;
      margin: 0 auto 32px;
      line-height: 1.7;
    }

    .hero-actions {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }

    .hero-actions .btn {
      padding: 14px 34px;
      font-size: 1.05rem;
    }

    .stats-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-md);
      border: 1px solid #e2e8f0;
      margin-top: 20px;
    }

    .stat-item {
      text-align: center;
      padding: 12px;
    }

    .stat-item .val {
      font-size: 2rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }

    .stat-item .lbl {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    .section {
      padding: 70px 0;
    }

    .section-head {
      text-align: center;
      max-width: 720px;
      margin: 0 auto 48px;
    }

    .section-tag {
      font-size: 0.85rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: var(--primary);
      margin-bottom: 8px;
      display: inline-block;
    }

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

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

    .models-chip-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      background: #ffffff;
      padding: 28px;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-color);
    }

    .model-chip {
      padding: 8px 16px;
      background: var(--surface-alt);
      border: 1px solid #e2e8f0;
      border-radius: 20px;
      font-size: 0.9rem;
      font-weight: 600;
      color: #334155;
      transition: all 0.2s ease;
    }

    .model-chip:hover {
      background: #eff6ff;
      border-color: #93c5fd;
      color: var(--primary);
      transform: translateY(-2px);
    }

    .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;
    }

    .card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
    }

    .card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-lg);
      border-color: #bfdbfe;
    }

    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: #eff6ff;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      font-weight: bold;
      margin-bottom: 18px;
    }

    .card h3 {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 12px;
      color: #1e293b;
    }

    .card p {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    .card-badge {
      display: inline-block;
      align-self: flex-start;
      margin-top: 14px;
      padding: 4px 10px;
      background: #f1f5f9;
      color: #475569;
      font-size: 0.8rem;
      font-weight: 600;
      border-radius: 6px;
    }

    .rating-banner {
      background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
      color: #ffffff;
      border-radius: var(--radius-lg);
      padding: 40px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      box-shadow: var(--shadow-lg);
      margin-bottom: 30px;
      flex-wrap: wrap;
      gap: 24px;
    }

    .rating-info h3 {
      font-size: 1.8rem;
      font-weight: 800;
      margin-bottom: 8px;
      color: #ffffff;
    }

    .rating-info p {
      color: #cbd5e1;
      font-size: 0.95rem;
    }

    .rating-score-box {
      display: flex;
      align-items: center;
      gap: 20px;
      background: rgba(255,255,255,0.1);
      padding: 16px 28px;
      border-radius: var(--radius);
      border: 1px solid rgba(255,255,255,0.2);
    }

    .score-num {
      font-size: 3rem;
      font-weight: 900;
      color: #38bdf8;
      line-height: 1;
    }

    .score-stars {
      color: #facc15;
      font-size: 1.4rem;
      letter-spacing: 2px;
    }

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

    table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.95rem;
    }

    th, td {
      padding: 18px 24px;
      border-bottom: 1px solid var(--border-color);
    }

    th {
      background: #f8fafc;
      font-weight: 700;
      color: #334155;
    }

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

    tr:hover td {
      background: #f8fafc;
    }

    .check-mark {
      color: #10b981;
      font-weight: 800;
      font-size: 1.1rem;
    }

    .cross-mark {
      color: #94a3b8;
    }

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

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

    .step-number {
      font-size: 1.75rem;
      font-weight: 900;
      color: #bfdbfe;
      margin-bottom: 12px;
    }

    .step-item h4 {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 8px;
      color: #1e293b;
    }

    .step-item p {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

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

    .image-holder {
      width: 100%;
      height: 220px;
      background: #f1f5f9;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }

    .image-holder img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.3s ease;
    }

    .image-card:hover .image-holder img {
      transform: scale(1.05);
    }

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

    .image-card-body h4 {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 8px;
      color: #1e293b;
    }

    .image-card-body p {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    .banner-gallery {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 32px;
    }

    .banner-box {
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      height: 160px;
      border: 1px solid var(--border-color);
    }

    .banner-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .faq-list {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
      transition: all 0.25s ease;
    }

    .faq-question {
      padding: 18px 24px;
      font-weight: 700;
      font-size: 1.05rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: #1e293b;
      user-select: none;
    }

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

    .faq-toggle-icon {
      font-size: 1.25rem;
      transition: transform 0.25s ease;
      color: #94a3b8;
    }

    .faq-answer {
      padding: 0 24px;
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    .faq-item.active {
      border-color: #93c5fd;
      box-shadow: var(--shadow-sm);
    }

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

    .faq-item.active .faq-answer {
      padding: 0 24px 20px 24px;
      max-height: 200px;
    }

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

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

    .review-avatar {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: linear-gradient(135deg, #2563eb, #38bdf8);
      color: #ffffff;
      font-weight: bold;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.1rem;
    }

    .review-user h4 {
      font-size: 1rem;
      font-weight: 700;
      color: #1e293b;
    }

    .review-user span {
      font-size: 0.82rem;
      color: var(--text-muted);
    }

    .review-stars {
      color: #eab308;
      font-size: 0.9rem;
      margin-bottom: 8px;
    }

    .review-text {
      font-size: 0.92rem;
      color: #334155;
      line-height: 1.6;
    }

    .form-wrapper {
      background: #ffffff;
      border-radius: var(--radius-lg);
      padding: 40px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }

    .form-info h3 {
      font-size: 1.75rem;
      font-weight: 800;
      margin-bottom: 16px;
      color: #0f172a;
    }

    .form-info p {
      font-size: 0.95rem;
      color: var(--text-muted);
      margin-bottom: 24px;
    }

    .contact-item {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 16px;
      font-size: 0.95rem;
      color: #334155;
    }

    .qr-container {
      margin-top: 24px;
      display: inline-block;
      text-align: center;
      padding: 12px;
      background: #f8fafc;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
    }

    .qr-container img {
      width: 130px;
      height: 130px;
      object-fit: cover;
      border-radius: 8px;
      display: block;
      margin: 0 auto 8px;
    }

    .qr-label {
      font-size: 0.82rem;
      color: var(--text-muted);
      font-weight: 600;
    }

    .contact-form {
      display: flex;
      flex-direction: column;
      gap: 18px;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    .form-group label {
      font-size: 0.9rem;
      font-weight: 600;
      color: #334155;
    }

    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 0.95rem;
      background: #f8fafc;
      color: var(--text-main);
      transition: all 0.2s ease;
      font-family: inherit;
    }

    .form-input:focus, .form-select:focus, .form-textarea:focus {
      outline: none;
      border-color: var(--primary);
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
    }

    .form-textarea {
      resize: vertical;
      min-height: 100px;
    }

    .articles-bar {
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }

    .article-links {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      margin-top: 14px;
    }

    .article-pill {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 8px 16px;
      background: #eff6ff;
      border: 1px solid #dbeafe;
      border-radius: 20px;
      font-size: 0.88rem;
      color: var(--primary-dark);
      font-weight: 600;
      transition: 0.2s ease;
    }

    .article-pill:hover {
      background: var(--primary);
      color: #ffffff;
    }

    footer {
      background: #0f172a;
      color: #cbd5e1;
      padding: 60px 0 30px;
      border-top: 1px solid #1e293b;
    }

    .footer-content {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      font-size: 1.1rem;
      font-weight: 700;
      color: #ffffff;
      margin-bottom: 18px;
    }

    .footer-col p {
      font-size: 0.9rem;
      line-height: 1.7;
      color: #94a3b8;
    }

    .footer-links {
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .footer-links a {
      font-size: 0.9rem;
      color: #94a3b8;
    }

    .footer-links a:hover {
      color: #ffffff;
      padding-left: 4px;
    }

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

    .friend-links a {
      font-size: 0.85rem;
      color: #94a3b8;
      background: #1e293b;
      padding: 4px 10px;
      border-radius: 4px;
    }

    .friend-links a:hover {
      color: #38bdf8;
      background: #334155;
    }

    .footer-bottom {
      text-align: center;
      padding-top: 30px;
      border-top: 1px solid #1e293b;
      font-size: 0.85rem;
      color: #64748b;
    }

    .footer-bottom a {
      color: #94a3b8;
    }

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

    .floating-tools {
      position: fixed;
      right: 20px;
      bottom: 40px;
      display: flex;
      flex-direction: column;
      gap: 12px;
      z-index: 99;
    }

    .floating-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      color: var(--primary);
      box-shadow: 0 4px 16px rgba(0,0,0,0.15);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      border: 1px solid var(--border-color);
      transition: all 0.25s ease;
      font-size: 1.1rem;
    }

    .floating-btn:hover {
      background: var(--primary);
      color: #ffffff;
      transform: translateY(-3px);
    }

    @media (max-width: 1024px) {
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .step-list {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-content {
        grid-template-columns: 1fr 1fr;
      }
      .banner-gallery {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .hero-title {
        font-size: 2rem;
      }
      .menu-toggle {
        display: flex;
      }
      .nav-links {
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        gap: 8px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
        display: none;
      }
      .nav-links.show {
        display: flex;
      }
      .nav-cta {
        display: none;
      }
      .stats-bar {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3, .grid-4, .grid-2 {
        grid-template-columns: 1fr;
      }
      .step-list {
        grid-template-columns: 1fr;
      }
      .form-wrapper {
        grid-template-columns: 1fr;
      }
      .footer-content {
        grid-template-columns: 1fr;
      }
      .banner-gallery {
        grid-template-columns: 1fr;
      }
    }