* { margin: 0; padding: 0; box-sizing: border-box; }
    body { background: #f5f7fb; font-family: 'Segoe UI', Roboto, sans-serif; color: #1e2a3e; padding-bottom: 70px; }
    .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

    .classic-header { background: #ffffff; border-bottom: 2px solid #e2e8f0; padding: 12px 0; position: sticky; top: 0; z-index: 10; }
    .header-inner { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
    .logo-area { display: flex; align-items: center; gap: 12px; }
    .logo-icon { width: 44px; height: 44px; background: #1e40af; border-radius: 12px; display: flex; align-items: center; justify-content: center; color: white; font-size: 22px; }
    .logo-text h2 { font-size: 1.4rem; font-weight: 700; color: #0f172a; }
    .logo-text p { font-size: 0.7rem; color: #4b5563; }
    .nav-links { display: flex; gap: 12px; }
    .nav-link { background: #f1f5f9; padding: 8px 18px; border-radius: 40px; text-decoration: none; font-size: 0.85rem; font-weight: 600; color: #1e293b; display: inline-flex; align-items: center; gap: 8px; }

    .hero { background: #0f2b4d; color: white; padding: 32px 0; margin-bottom: 24px; }
    .hero-grid { display: flex; flex-wrap: wrap; gap: 24px; }
    .hero-content { flex: 1; }
    .hero-badge { display: inline-flex; gap: 8px; background: rgba(255,255,255,0.12); padding: 6px 14px; border-radius: 40px; font-size: 0.8rem; margin-bottom: 20px; }
    .hero h1 { font-size: 2rem; font-weight: 800; margin-bottom: 16px; }
    .btn-primary { background: white; color: #1e40af; padding: 10px 24px; border-radius: 40px; font-weight: 700; text-decoration: none; display: inline-flex; align-items: center; gap: 8px; cursor: pointer; border: none; }

    .pill-list { display: flex; flex-wrap: wrap; gap: 12px; border-bottom: 1px solid #e2e8f0; padding-bottom: 10px; margin: 20px 0 24px; }
    .pill { background: white; border: 1px solid #cbd5e1; padding: 8px 20px; border-radius: 40px; font-size: 0.85rem; font-weight: 600; color: #334155; cursor: pointer; display: inline-flex; align-items: center; gap: 8px; text-decoration: none; }
    .pill.active, .pill:hover { background: #eef2ff; border-color: #2563eb; color: #1d4ed8; }

    .section-header { display: flex; justify-content: space-between; align-items: flex-end; flex-wrap: wrap; margin-bottom: 24px; border-left: 4px solid #2563eb; padding-left: 16px; }
    .section-header h2 { font-size: 1.7rem; font-weight: 700; }
    .section-header p { color: #64748b; }

    .product-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(270px, 1fr)); gap: 24px; margin-bottom: 40px; }
    .product-card { background: white; border: 1px solid #e2e8f0; border-radius: 20px; overflow: hidden; transition: all 0.2s; }
    .product-card:hover { transform: translateY(-3px); box-shadow: 0 8px 20px rgba(0,0,0,0.05); }
    .product-img { width: 100%; height: 160px; object-fit: cover; background: #f1f5f9; display: flex; align-items: center; justify-content: center; }
    .badge-validity { background: #1e293b; color: white; font-size: 0.7rem; padding: 4px 10px; border-radius: 30px; position: absolute; top: 12px; left: 12px; }
    .badge-stock { position: absolute; top: 12px; right: 12px; font-size: 0.7rem; padding: 4px 10px; border-radius: 30px; color: #fff; }
    .badge-stock.in { background: #16a34a; }
    .badge-stock.out { background: #dc2626; }
    .card-body { padding: 18px; }
    .product-title { font-weight: 800; font-size: 1rem; margin-bottom: 6px; }
    .price-badge { background: #dcfce7; color: #166534; padding: 5px 12px; border-radius: 40px; font-weight: 700; font-size: 0.85rem; display: inline-block; }
    .button-group { margin-top: 15px; }
    .btn-buy { background: #2563eb; border: none; color: white; padding: 10px; border-radius: 40px; font-weight: 700; cursor: pointer; width: 100%; display: flex; align-items: center; justify-content: center; gap: 8px; }
    .btn-buy:hover { background: #1d4ed8; }
    .btn-gift { background: #ec4899; border: none; color: white; padding: 10px; border-radius: 40px; font-weight: 700; cursor: pointer; width: 100%; display: flex; align-items: center; justify-content: center; gap: 8px; margin-top: 8px; }
    .btn-gift:hover { background: #db2777; }
    .btn-disabled { background: #94a3b8; border: none; color: white; padding: 10px; border-radius: 40px; font-weight: 700; cursor: not-allowed; width: 100%; }
    .share-link { background: #f8fafc; border: 1px solid #e2e8f0; text-decoration: none; text-align: center; padding: 8px; border-radius: 40px; font-size: 0.75rem; color: #2d3a4b; display: flex; align-items: center; justify-content: center; gap: 6px; margin-top: 8px; }

    .bottom-nav { position: fixed; bottom: 0; left: 0; right: 0; background: white; border-top: 1px solid #e2e8f0; padding: 8px 0 12px; z-index: 20; }
    .bottom-menu { display: flex; justify-content: space-around; max-width: 600px; margin: 0 auto; }
    .bottom-item { display: flex; flex-direction: column; align-items: center; color: #94a3b8; font-size: 0.7rem; font-weight: 600; gap: 4px; cursor: pointer; background: none; border: none; padding: 4px 12px; }
    .bottom-item i { font-size: 1.3rem; }
    .bottom-item.active { color: #2563eb; }

    .go-top { position: fixed; bottom: 80px; right: 20px; background: #1e293b; color: white; width: 44px; height: 44px; border-radius: 50%; display: flex; align-items: center; justify-content: center; cursor: pointer; z-index: 30; border: none; }

    .tab-content { display: none; animation: fadeIn 0.3s ease; }
    .tab-content.active-tab-content { display: block; }
    @keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

    .modal { display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.6); z-index: 1000; align-items: center; justify-content: center; }
    .modal-content { background: white; max-width: 550px; width: 90%; border-radius: 28px; position: relative; padding: 28px 24px; max-height: 90vh; overflow-y: auto; }
    .modal-close { position: absolute; top: 16px; right: 20px; font-size: 28px; cursor: pointer; }
    .form-group { margin-bottom: 1.5rem; }
    .form-group label { display: block; font-size: 0.85rem; font-weight: 600; margin-bottom: 6px; }
    .form-group input { width: 100%; padding: 12px; border: 1px solid #cbd5e1; border-radius: 12px; }
    .btn-pay { background: linear-gradient(135deg, #2563eb, #1d4ed8); border: none; color: white; font-weight: 700; padding: 14px; border-radius: 40px; width: 100%; cursor: pointer; }
    .btn-pay:disabled { opacity: 0.7; cursor: not-allowed; }
    .network-card { flex: 1; background:#f8fafc; border:2px solid #e2e8f0; border-radius:20px; padding:20px; text-align:center; cursor:pointer; }
    .network-card:hover { border-color:#2563eb; }
    footer { text-align: center; padding: 20px 0; font-size: 0.7rem; color: #64748b; }

    @media (max-width: 768px) {
      .hero h1 { font-size: 1.6rem; }
      .container { padding: 0 14px; }
    }

    /* Full-page overlay for iframe */
    .full-iframe-overlay {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: white;
      z-index: 2000;
      overflow: hidden;
    }
    .full-iframe-overlay iframe {
      width: 100%;
      height: 100%;
      border: none;
    }
    .close-iframe-btn {
      position: absolute;
      top: 15px;
      right: 20px;
      background: #1e293b;
      color: white;
      width: 40px;
      height: 40px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      z-index: 2001;
      font-size: 24px;
      border: none;
      box-shadow: 0 2px 10px rgba(0,0,0,0.2);
    }