:root {
  --brand: #ee4d2d;
  --brand-600: #d63f22;
  --bg: #f5f5f5;
  --text: #222;
  --muted: #666;
  --card: #fff;
  --border: #eee;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
}

.container { width: min(1200px, 100%); margin: 0 auto; padding: 0 16px; }

.header { background: var(--card); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 50; }
.header__inner { display: flex; align-items: center; gap: 16px; padding: 12px 0; }
.logo { font-weight: 800; font-size: 22px; text-decoration: none; color: var(--text); }
.logo span { color: var(--brand); }
.search { flex: 1; display: flex; gap: 8px; }
.search input { flex: 1; padding: 10px 12px; border-radius: 8px; border: 1px solid var(--border); background: #fafafa; }
.search button { padding: 10px 14px; border-radius: 8px; border: 1px solid var(--border); background: var(--card); cursor: pointer; }
.header__actions { display: flex; align-items: center; gap: 12px; }
.badge { background: var(--brand); color: #fff; border-radius: 999px; padding: 2px 8px; font-size: 12px; margin-left: 4px; }
.cart-btn { background: transparent; border: none; cursor: pointer; font-size: 16px; }

.topnav { background: var(--card); border-bottom: 1px solid var(--border); }
.topnav__links { display: flex; list-style: none; gap: 12px; padding: 8px 0; margin: 0; overflow:auto; }
.topnav__links li { white-space: nowrap; }
.topnav__links a { display: inline-block; padding: 8px 12px; border-radius: 999px; background: #fafafa; color: var(--text); text-decoration: none; border: 1px solid var(--border); }
.topnav__links a.active { background: var(--brand); color: #fff; border-color: var(--brand); }

.layout { display: grid; grid-template-columns: 260px 1fr; gap: 16px; padding: 16px 0 32px; }
.sidebar { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 12px; }
.sidebar h3 { margin: 12px 0; font-size: 16px; }
.category-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 6px; }
.category-list a { display: block; padding: 8px 10px; border-radius: 8px; color: var(--text); text-decoration: none; border: 1px solid var(--border); background: #fafafa; }
.category-list a.active { background: var(--brand); color: #fff; border-color: var(--brand); }
.filters { display: grid; gap: 10px; }
.filter { display: grid; gap: 6px; font-size: 14px; }
.filter input[type="number"] { padding: 8px 10px; border-radius: 8px; border: 1px solid var(--border); background: #fafafa; }

.btn { padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px; background: var(--card); cursor: pointer; }
.btn--primary { background: var(--brand); color: #fff; border-color: var(--brand); }
.btn--ghost { background: transparent; }
.icon-btn { border: none; background: transparent; cursor: pointer; font-size: 16px; }

.content { min-height: 60vh; }
.toolbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }
.sort select { padding: 8px 10px; border-radius: 8px; border: 1px solid var(--border); background: #fafafa; }

.grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 12px; overflow: hidden; display: flex; flex-direction: column; }
.card__media { position: relative; }
.card__img { aspect-ratio: 1/1; width: 100%; object-fit: cover; background: #f0f0f0; display: block; }
.card__media.has-overlay .card__overlay { position: absolute; inset: 0; background: linear-gradient(to top, rgba(0,0,0,0.65), rgba(0,0,0,0.1)); color: #fff; opacity: 0; transition: opacity .2s ease-in-out; display: flex; align-items: flex-end; }
.card__media.has-overlay:hover .card__overlay { opacity: 1; }
.card__overlay-content { padding: 10px; font-size: 12px; line-height: 1.5; max-height: 70%; overflow: auto; }
.card__body { padding: 10px; display: grid; gap: 8px; }
.price { display: flex; align-items: baseline; gap: 8px; }
.price__current { color: var(--brand); font-weight: 700; }
.price__old { color: var(--muted); text-decoration: line-through; font-size: 12px; }
.rating { color: #f59e0b; font-size: 12px; }
.card__actions { display: flex; gap: 8px; }

.footer { background: var(--card); border-top: 1px solid var(--border); }
.footer__inner { display: flex; justify-content: space-between; align-items: center; padding: 16px 0; }
.footer__inner > div:first-child { display: flex; gap: 8px; align-items: center; }
.footer__inner img { border-radius: 8px; transition: transform 0.2s ease; cursor: pointer; }
.footer__inner img:hover { transform: scale(1.1); }
.footer__links { display: flex; gap: 12px; }
.footer__links a { color: var(--muted); text-decoration: none; }

/* Drawer */
.drawer { position: fixed; inset: 0; display: none; }
.drawer[aria-hidden="false"] { display: block; }
.drawer__overlay { position: absolute; inset: 0; background: rgba(0,0,0,.4); }
.drawer__panel { position: absolute; right: 0; top: 0; height: 100%; width: min(420px, 100%); background: var(--card); border-left: 1px solid var(--border); display: grid; grid-template-rows: auto 1fr auto; }
.drawer__header { display: flex; justify-content: space-between; align-items: center; padding: 12px; border-bottom: 1px solid var(--border); }
.drawer__footer { padding: 12px; border-top: 1px solid var(--border); display: grid; gap: 10px; }
.cart-items { padding: 12px; display: grid; gap: 12px; overflow: auto; }
.cart-item { display: grid; grid-template-columns: 64px 1fr auto; gap: 10px; align-items: center; }
.cart-item img { width: 64px; height: 64px; object-fit: cover; border-radius: 8px; }
.qty { display: inline-flex; align-items: center; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
.qty button { background: #fafafa; border: none; padding: 6px 10px; cursor: pointer; }
.qty input { width: 40px; text-align: center; border: none; padding: 6px 0; }
.subtotal { display: flex; justify-content: space-between; align-items: center; }

/* Modal */
.modal { position: fixed; inset: 0; display: none; }
.modal[aria-hidden="false"] { display: grid; place-items: center; }
.modal__overlay { position: absolute; inset: 0; background: rgba(0,0,0,.4); }
.modal__content { position: relative; background: var(--card); width: min(720px, 96%); max-height: 92vh; border-radius: 12px; border: 1px solid var(--border); overflow: hidden; }
.modal__close { position: absolute; top: 8px; right: 8px; }
.modal__body { padding: 16px; display: grid; gap: 12px; }

.product-detail { display: grid; grid-template-columns: 1fr 1.2fr; gap: 16px; }
.product-detail img { width: 100%; border-radius: 12px; }
.product-detail__title { font-size: 20px; font-weight: 700; }

.order-summary { display: grid; gap: 8px; padding: 8px 0; border-bottom: 1px dashed var(--border); }
.checkout-form { display: grid; gap: 10px; margin-top: 8px; }
.checkout-form input { padding: 10px 12px; border-radius: 8px; border: 1px solid var(--border); background: #fafafa; }

/* Image Zoom Modal */
.image-zoom-modal { position: fixed; inset: 0; display: none; z-index: 1000; }
.image-zoom-modal[aria-hidden="false"] { display: flex; align-items: center; justify-content: center; }
.image-zoom-overlay { position: absolute; inset: 0; background: rgba(0,0,0,0.8); }
.image-zoom-content { position: relative; max-width: 90vw; max-height: 90vh; }
.image-zoom-content img { width: 100%; height: 100%; object-fit: contain; border-radius: 12px; }
.image-zoom-close { position: absolute; top: -40px; right: 0; background: rgba(255,255,255,0.9); border-radius: 50%; width: 32px; height: 32px; display: flex; align-items: center; justify-content: center; font-size: 18px; }
.zoomable-image { cursor: pointer; transition: transform 0.2s ease; }
.zoomable-image:hover { transform: scale(1.05); }

/* Responsive */
@media (max-width: 1024px) {
  .grid { grid-template-columns: repeat(4, 1fr); }
}
@media (max-width: 840px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar { order: 2; }
  .content { order: 1; }
  .grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 640px) {
  .search { display: none; }
  .grid { grid-template-columns: repeat(2, 1fr); }
  .product-detail { grid-template-columns: 1fr; }
}