:root {
      --primary-color: #6366f1;
      --primary-gradient: linear-gradient(135deg, #4f46e5 0%, #7c3aed 50%, #ec4899 100%);
      --accent-color: #f43f5e;
      --secondary-gradient: linear-gradient(135deg, #06b6d4 0%, #3b82f6 100%);
      --bg-light: #f8fafc;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --border-color: #e2e8f0;
      --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
      --shadow-lg: 0 20px 25px -5px rgba(99, 102, 241, 0.12), 0 10px 10px -5px rgba(99, 102, 241, 0.04);
      --radius-lg: 16px;
      --radius-md: 10px;
      --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, "Noto Sans", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.6;
    }

    body {
      overflow-x: hidden;
      width: 100%;
    }

    a {
      color: var(--primary-color);
      text-decoration: none;
      transition: all 0.3s ease;
    }

    a:hover {
      color: #4338ca;
    }

    /* Container Standard */
    .container {
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 20px;
    }

    /* Section Global Styles */
    section {
      padding: 70px 0;
      position: relative;
    }

    .section-title-wrap {
      text-align: center;
      margin-bottom: 45px;
    }

    .section-tag {
      display: inline-block;
      padding: 6px 16px;
      background: linear-gradient(90deg, rgba(99,102,241,0.1) 0%, rgba(236,72,153,0.1) 100%);
      color: #4f46e5;
      font-size: 0.88rem;
      font-weight: 700;
      border-radius: 30px;
      margin-bottom: 12px;
      text-transform: uppercase;
      letter-spacing: 1px;
      border: 1px solid rgba(99,102,241,0.2);
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 15px;
      letter-spacing: -0.5px;
    }

    .section-subtitle {
      font-size: 1.05rem;
      color: var(--text-muted);
      max-width: 700px;
      margin: 0 auto;
    }

    /* Header & Navigation */
    header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 10px rgba(0,0,0,0.03);
    }

    .nav-wrapper {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
    }

    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
    }

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

    .brand-name {
      font-size: 1.35rem;
      font-weight: 800;
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

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

    .nav-links li a {
      padding: 8px 14px;
      color: var(--text-main);
      font-weight: 600;
      font-size: 0.93rem;
      border-radius: 6px;
      display: inline-block;
    }

    .nav-links li a:hover {
      color: var(--primary-color);
      background-color: rgba(99, 102, 241, 0.08);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 24px;
      font-size: 0.95rem;
      font-weight: 700;
      border-radius: 50px;
      cursor: pointer;
      border: none;
      transition: all 0.3s ease;
      box-shadow: var(--shadow-sm);
      text-align: center;
    }

    .btn-primary {
      background: var(--primary-gradient);
      color: #ffffff !important;
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(99, 102, 241, 0.4);
    }

    .btn-secondary {
      background: #ffffff;
      color: var(--text-main) !important;
      border: 2px solid var(--border-color);
    }

    .btn-secondary:hover {
      border-color: var(--primary-color);
      color: var(--primary-color) !important;
      transform: translateY(-2px);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      cursor: pointer;
      color: var(--text-main);
    }

    /* Hero Section (No images strictly applied) */
    .hero-section {
      background: radial-gradient(circle at 50% 20%, rgba(99, 102, 241, 0.12) 0%, rgba(248, 250, 252, 1) 70%);
      padding: 90px 0 70px 0;
      text-align: center;
    }

    .hero-badge-wrap {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      background: #ffffff;
      border: 1px solid rgba(99,102,241,0.3);
      border-radius: 30px;
      box-shadow: 0 4px 12px rgba(0,0,0,0.05);
      margin-bottom: 25px;
    }

    .hero-badge-tag {
      background: var(--accent-color);
      color: #fff;
      font-size: 0.75rem;
      font-weight: 800;
      padding: 2px 8px;
      border-radius: 20px;
    }

    .hero-badge-text {
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
    }

    h1.hero-title {
      font-size: 2.8rem;
      font-weight: 900;
      color: var(--text-main);
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -1px;
    }

    h1.hero-title span {
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 1.2rem;
      color: var(--text-muted);
      max-width: 800px;
      margin: 0 auto 35px auto;
      line-height: 1.7;
    }

    .hero-buttons {
      display: flex;
      justify-content: center;
      gap: 18px;
      flex-wrap: wrap;
      margin-bottom: 40px;
    }

    .hero-official-btn {
      padding: 14px 36px;
      font-size: 1.1rem;
    }

    .hero-stats-row {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      max-width: 950px;
      margin: 0 auto;
      background: #ffffff;
      padding: 25px;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-lg);
      border: 1px solid rgba(99,102,241,0.15);
    }

    .stat-item {
      text-align: center;
    }

    .stat-num {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--primary-color);
      margin-bottom: 4px;
    }

    .stat-label {
      font-size: 0.88rem;
      color: var(--text-muted);
      font-weight: 600;
    }

    /* Cards Grid */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 24px;
    }

    .grid-4 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 20px;
    }

    .card {
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      padding: 30px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      position: relative;
      overflow: hidden;
    }

    .card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-lg);
      border-color: rgba(99,102,241,0.4);
    }

    .card-icon {
      width: 50px;
      height: 50px;
      border-radius: 12px;
      background: linear-gradient(135deg, rgba(99,102,241,0.15) 0%, rgba(236,72,153,0.15) 100%);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      color: var(--primary-color);
      margin-bottom: 20px;
      font-weight: bold;
    }

    .card-title {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }

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

    /* Tag Cloud */
    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 25px;
    }

    .tag-chip {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 8px 16px;
      border-radius: 20px;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
      box-shadow: var(--shadow-sm);
      transition: all 0.2s ease;
    }

    .tag-chip:hover {
      background: var(--primary-gradient);
      color: #fff;
      border-color: transparent;
    }

    /* Comparison Table Section */
    .table-container {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border-color);
    }

    .custom-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 650px;
    }

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

    .custom-table th {
      background: #f1f5f9;
      font-weight: 700;
      color: var(--text-main);
      font-size: 0.95rem;
    }

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

    .highlight-col {
      background: rgba(99,102,241,0.04);
      font-weight: 700;
      color: #4f46e5;
    }

    /* Rating Card Box */
    .rating-box {
      background: linear-gradient(135deg, #1e1b4b 0%, #311b92 100%);
      color: #ffffff;
      padding: 30px;
      border-radius: var(--radius-lg);
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 30px;
      flex-wrap: wrap;
      gap: 20px;
    }

    .rating-score {
      font-size: 3rem;
      font-weight: 900;
      color: #fbbf24;
      line-height: 1;
    }

    .rating-stars {
      color: #fbbf24;
      font-size: 1.4rem;
      margin-top: 5px;
    }

    /* Review Cards */
    .review-card {
      background: #ffffff;
      padding: 25px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .review-header {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 15px;
    }

    .avatar-placeholder {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--primary-gradient);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      font-size: 1.1rem;
    }

    .reviewer-info h4 {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-main);
    }

    .reviewer-info p {
      font-size: 0.82rem;
      color: var(--text-muted);
    }

    .review-content {
      font-size: 0.93rem;
      color: var(--text-muted);
      font-style: italic;
    }

    /* Accordion FAQ */
    .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-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

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

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

    .faq-answer {
      padding: 0 24px 20px 24px;
      font-size: 0.95rem;
      color: var(--text-muted);
      display: none;
      line-height: 1.6;
      border-top: 1px solid #f1f5f9;
      padding-top: 15px;
    }

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

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

    .faq-toggle-icon {
      transition: transform 0.3s ease;
      font-size: 0.9rem;
    }

    /* Contact & Form Section */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: start;
    }

    .contact-info-card {
      background: #ffffff;
      padding: 35px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .contact-item {
      display: flex;
      align-items: flex-start;
      gap: 15px;
      margin-bottom: 22px;
    }

    .contact-icon {
      width: 40px;
      height: 40px;
      border-radius: 8px;
      background: rgba(99,102,241,0.1);
      color: var(--primary-color);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
    }

    .qr-box {
      margin-top: 20px;
      padding-top: 20px;
      border-top: 1px solid var(--border-color);
      display: flex;
      align-items: center;
      gap: 20px;
    }

    .qr-box img {
      width: 110px;
      height: 110px;
      border-radius: 8px;
      border: 1px solid var(--border-color);
    }

    .form-card {
      background: #ffffff;
      padding: 35px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-lg);
    }

    .form-group {
      margin-bottom: 18px;
    }

    .form-group label {
      display: block;
      font-weight: 700;
      margin-bottom: 6px;
      font-size: 0.9rem;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 0.95rem;
      outline: none;
      transition: border-color 0.2s ease;
      background: #f8fafc;
    }

    .form-control:focus {
      border-color: var(--primary-color);
      background: #ffffff;
    }

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

    /* Footer */
    footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px 0;
      border-top: 1px solid #1e293b;
    }

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

    .footer-col h4 {
      color: #ffffff;
      font-size: 1.1rem;
      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;
    }

    .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 10px 15px;
      margin-top: 10px;
    }

    .friend-links a {
      color: #94a3b8;
      font-size: 0.88rem;
    }

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

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 25px;
      text-align: center;
      font-size: 0.85rem;
      color: #64748b;
    }

    /* Floating Widget */
    .float-widget {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .float-btn {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: var(--primary-gradient);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 15px rgba(0,0,0,0.2);
      cursor: pointer;
      font-size: 1.2rem;
      border: none;
      transition: transform 0.2s ease;
    }

    .float-btn:hover {
      transform: scale(1.1);
    }

    /* Article List Styling */
    .article-list-container {
      background: #ffffff;
      padding: 25px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .article-item-link {
      display: block;
      padding: 12px 0;
      border-bottom: 1px dashed var(--border-color);
      color: var(--text-main);
      font-weight: 600;
      font-size: 0.95rem;
    }

    .article-item-link:last-child {
      border-bottom: none;
    }

    .article-item-link:hover {
      color: var(--primary-color);
      padding-left: 6px;
    }

    /* Media Queries Responsive */
    @media (max-width: 992px) {
      .hero-stats-row {
        grid-template-columns: repeat(2, 1fr);
      }

      .contact-wrapper {
        grid-template-columns: 1fr;
      }

      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        border-bottom: 1px solid var(--border-color);
      }

      .nav-links.active {
        display: flex;
      }

      .mobile-menu-btn {
        display: block;
      }

      h1.hero-title {
        font-size: 2rem;
      }

      .section-title {
        font-size: 1.7rem;
      }

      .footer-grid {
        grid-template-columns: 1fr;
      }

      .hero-stats-row {
        grid-template-columns: 1fr;
      }
    }