/* =========================================================
   TPS BILLIARDS - RESPONSIVE
   Breakpoints: Mobile (<640), Tablet (640-1024), Desktop (>1024)
   ========================================================= */

/* ===== TABLET (max 1024px) ===== */
@media (max-width: 1024px) {
  :root {
    --font-size-4xl: 1.875rem;
    --font-size-5xl: 2.25rem;
  }

  /* Header: ẩn menu chính, hiện nút hamburger */
  .main-nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--color-white);
    padding: 80px 24px 24px;
    flex-direction: column;
    box-shadow: -8px 0 32px rgba(0,0,0,0.1);
    transition: right var(--transition);
    z-index: 200;
  }
  .main-nav.active { right: 0; }
  .main-nav ul {
    flex-direction: column;
    width: 100%;
    gap: 0;
  }
  .main-nav a {
    display: block;
    padding: 14px 0;
    border-bottom: 1px solid var(--color-gray-100);
    font-size: var(--font-size-lg);
  }
  .menu-toggle { display: flex; align-items: center; justify-content: center; }

  /* Overlay khi mở menu mobile */
  .menu-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 150;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition);
  }
  .menu-overlay.active { opacity: 1; visibility: visible; }

  /* Products grid: 3 cột */
  .products-grid { grid-template-columns: repeat(3, 1fr); }

  /* Hero */
  .hero { height: 480px; }
  .hero-content h1 { font-size: 2.25rem; }

  /* Shop layout */
  .shop-layout { grid-template-columns: 240px 1fr; }

  /* Product detail */
  .product-detail { gap: 32px; }

  /* Footer 2 cột */
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }

  /* Cart layout */
  .cart-layout { grid-template-columns: 1fr; }
  .order-summary { position: static; }

  /* Checkout */
  .checkout-layout { grid-template-columns: 1fr; }
  .checkout-summary { position: static; }
}

/* ===== MOBILE LANDSCAPE & SMALL TABLET (max 768px) ===== */
@media (max-width: 768px) {
  .container { padding: 0 16px; }
  .section { padding: 48px 0; }

  /* Header trên mobile */
  .header-main {
    flex-wrap: wrap;
    gap: 12px;
  }
  .search-bar {
    order: 3;
    flex-basis: 100%;
    max-width: 100%;
  }

  /* Products grid: 2 cột */
  .products-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .product-info { padding: 12px; }
  .product-name { font-size: var(--font-size-sm); }
  .price-current { font-size: var(--font-size-base); }

  /* Quick-add luôn hiện trên mobile (vì không có hover) */
  .quick-add { transform: translateY(0); position: static; }
  .product-actions { opacity: 1; transform: none; }
  .action-btn { width: 32px; height: 32px; font-size: 14px; }

  /* Hero */
  .hero { height: 420px; }
  .hero-content h1 { font-size: 1.875rem; }
  .hero-content p { font-size: var(--font-size-base); }
  .hero-arrow { width: 40px; height: 40px; }

  /* Promo banners 1 cột */
  .promo-banners { grid-template-columns: 1fr; }
  .promo-banner { padding: 32px 24px; aspect-ratio: 16/9; }

  /* Shop layout: filter ẩn, hiện qua nút */
  .shop-layout { grid-template-columns: 1fr; }
  .shop-sidebar {
    position: fixed;
    top: 0;
    left: -100%;
    width: 90%;
    max-width: 360px;
    height: 100vh;
    z-index: 250;
    overflow-y: auto;
    border-radius: 0;
    transition: left var(--transition);
  }
  .shop-sidebar.active { left: 0; }
  .filter-toggle {
    display: inline-flex !important;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-md);
    background: var(--color-white);
    font-weight: 600;
  }

  /* Product detail layout */
  .product-detail { grid-template-columns: 1fr; padding: 24px 0; }
  .product-info-detail h1 { font-size: var(--font-size-2xl); }
  .detail-price .price-current { font-size: var(--font-size-2xl); }

  /* Tab nav scrollable */
  .tab-nav {
    overflow-x: auto;
    flex-wrap: nowrap;
    gap: 24px;
  }
  .tab-nav button { font-size: var(--font-size-base); white-space: nowrap; }

  /* Cart items - layout dọc */
  .cart-item {
    grid-template-columns: 80px 1fr auto;
    gap: 12px;
    padding: 16px;
  }
  .cart-item img { width: 80px; height: 80px; }
  .cart-item-price { grid-column: 2; }
  .cart-item .qty-selector { grid-column: 1 / 3; }

  /* Form */
  .form-row { grid-template-columns: 1fr; }

  /* Newsletter form */
  .newsletter-form { flex-direction: column; }

  /* Spec table */
  .spec-table td:first-child { width: 40%; }
}

/* ===== MOBILE NHỎ (max 480px) ===== */
@media (max-width: 480px) {
  :root { --font-size-3xl: 1.5rem; --font-size-4xl: 1.75rem; }

  .header-top { font-size: 11px; padding: 6px 0; }

  .logo { font-size: var(--font-size-lg); }
  .logo-icon { width: 30px; height: 30px; font-size: var(--font-size-base); }

  .header-icons { gap: 8px; }
  .icon-btn { width: 38px; height: 38px; }

  /* Hero */
  .hero { height: 380px; }
  .hero-content h1 { font-size: 1.5rem; }
  .hero-controls { bottom: 16px; right: 16px; }

  /* Buttons */
  .btn { padding: 10px 20px; font-size: var(--font-size-sm); }
  .btn-lg { padding: 12px 24px; font-size: var(--font-size-base); }

  /* Section title */
  .section-title { font-size: var(--font-size-2xl); }

  /* Footer 1 cột */
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }

  /* Detail actions dọc */
  .detail-actions { flex-direction: column; }
}

/* Print friendly */
@media print {
  .site-header, .site-footer, .hero-controls, .hero-arrow, .product-actions,
  .quick-add, .menu-toggle, .filter-toggle { display: none !important; }
}