/* ── Variables ── */
:root {
  --clr-bg: #f7f6f3;
  --clr-surface: #ffffff;
  --clr-text: #1a1a1a;
  --clr-text-muted: #6b6b6b;
  --clr-accent: #2c2c2c;
  --clr-accent-light: #e8e5df;
  --clr-border: #e0ddd7;
  --clr-overlay: rgba(0, 0, 0, .72);
  --font-display: 'Playfair Display', Georgia, serif;
  --font-body: 'DM Sans', system-ui, sans-serif;
  --radius: 8px;
  --shadow-card: 0 1px 3px rgba(0,0,0,.06), 0 4px 12px rgba(0,0,0,.04);
  --shadow-card-hover: 0 4px 16px rgba(0,0,0,.1);
  --header-h: 56px;
  --filters-h: 110px;
  --transition: .22s ease;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: var(--font-body);
  color: var(--clr-text);
  background: var(--clr-bg);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button { cursor: pointer; border: none; background: none; font: inherit; color: inherit; }
img { display: block; max-width: 100%; }

/* ── Header ── */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--header-h);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 clamp(16px, 4vw, 48px);
  background: var(--clr-surface);
  border-bottom: 1px solid var(--clr-border);
}
.site-header__brand {
  font-family: var(--font-display);
  font-size: 1.25rem; font-weight: 600;
  letter-spacing: .02em;
}
.site-header__login {
  font-size: .875rem; font-weight: 500;
  padding: 6px 18px;
  border: 1px solid var(--clr-accent);
  border-radius: 100px;
  transition: background var(--transition), color var(--transition);
}
.site-header__login:hover {
  background: var(--clr-accent);
  color: #fff;
}

/* ── Filters ── */
.filters {
  position: sticky; top: var(--header-h); z-index: 90;
  background: var(--clr-bg);
  padding: 16px clamp(16px, 4vw, 48px) 0;
  border-bottom: 1px solid var(--clr-border);
}
.filters__bar {
  display: flex; align-items: center; gap: 16px;
  flex-wrap: nowrap;
}
.filters__chips {
  display: flex; gap: 8px;
  overflow-x: auto; -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  flex: 1; min-width: 0;
  padding-bottom: 4px;
}
.filters__chips::-webkit-scrollbar { display: none; }
.chip {
  flex-shrink: 0;
  padding: 6px 16px;
  font-size: .8125rem; font-weight: 500;
  border-radius: 100px;
  border: 1px solid var(--clr-border);
  background: var(--clr-surface);
  color: var(--clr-text-muted);
  transition: all var(--transition);
  white-space: nowrap;
}
.chip:hover { border-color: var(--clr-accent); color: var(--clr-text); }
.chip--active {
  background: var(--clr-accent);
  border-color: var(--clr-accent);
  color: #fff;
}
.filters__search {
  display: flex; align-items: center;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  overflow: hidden;
  flex-shrink: 0;
  width: 240px;
  transition: border-color var(--transition);
}
.filters__search:focus-within { border-color: var(--clr-accent); }
.filters__input {
  border: none; outline: none; background: none;
  padding: 8px 12px;
  font-size: .875rem;
  width: 100%;
}
.filters__btn {
  padding: 8px 12px;
  color: var(--clr-text-muted);
  transition: color var(--transition);
}
.filters__btn:hover { color: var(--clr-text); }
.filters__count {
  font-size: .75rem; color: var(--clr-text-muted);
  padding: 8px 0 10px;
}

/* ── Catalog grid ── */
.catalog {
  padding: 24px clamp(16px, 4vw, 48px) 80px;
  margin-top: calc(var(--header-h));
}
.product-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

/* ── Product card ── */
.product-card {
  background: var(--clr-surface);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: box-shadow var(--transition), transform var(--transition);
}
.product-card:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}
.product-card__image-wrap {
  position: relative;
  aspect-ratio: 1 / 1;
  background: var(--clr-accent-light);
  cursor: pointer;
  overflow: hidden;
}
.product-card__img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform .35s ease;
}
.product-card:hover .product-card__img { transform: scale(1.04); }
.product-card__no-img {
  display: flex; align-items: center; justify-content: center;
  width: 100%; height: 100%;
  font-size: .8125rem; color: var(--clr-text-muted);
}
.product-card__badge {
  position: absolute; bottom: 8px; right: 8px;
  background: rgba(0,0,0,.65);
  color: #fff;
  font-size: .6875rem; font-weight: 500;
  padding: 3px 10px;
  border-radius: 100px;
  pointer-events: none;
}
.product-card__info {
  padding: 14px 16px 18px;
  display: flex; flex-direction: column; gap: 4px;
}
.product-card__name {
  font-family: var(--font-display);
  font-size: .9375rem; font-weight: 600;
  line-height: 1.3;
}
.product-card__sku {
  font-size: .75rem; font-weight: 500;
  color: var(--clr-text-muted);
  letter-spacing: .04em;
  text-transform: uppercase;
}
.product-card__dims {
  font-size: .75rem;
  color: var(--clr-text-muted);
  margin-top: 2px;
}

/* ── Loader ── */
.loader {
  display: flex; justify-content: center;
  padding: 40px 0;
}
.loader__spinner {
  width: 28px; height: 28px;
  border: 2.5px solid var(--clr-border);
  border-top-color: var(--clr-accent);
  border-radius: 50%;
  animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.catalog__empty {
  text-align: center;
  padding: 80px 16px;
  color: var(--clr-text-muted);
  font-size: 1rem;
}

.infinite-more-link { display: none; }

/* ── Lightbox ── */
.lightbox {
  position: fixed; inset: 0; z-index: 1000;
  display: flex; align-items: center; justify-content: center;
  opacity: 0; visibility: hidden;
  transition: opacity .25s ease, visibility .25s ease;
}
.lightbox[aria-hidden="false"] { opacity: 1; visibility: visible; }
.lightbox__overlay {
  position: absolute; inset: 0;
  background: var(--clr-overlay);
}
.lightbox__container {
  position: relative; z-index: 1;
  display: flex; flex-direction: column; align-items: center;
  max-width: 92vw; max-height: 92vh;
}
.lightbox__img {
  max-width: 90vw; max-height: 72vh;
  object-fit: contain;
  border-radius: var(--radius);
  user-select: none;
  -webkit-user-drag: none;
}
.lightbox__close {
  position: absolute; top: -40px; right: -8px;
  font-size: 2rem; color: #fff;
  width: 40px; height: 40px;
  display: flex; align-items: center; justify-content: center;
}
.lightbox__prev, .lightbox__next {
  position: absolute; top: 50%; transform: translateY(-50%);
  font-size: 2.5rem; color: rgba(255,255,255,.85);
  width: 48px; height: 48px;
  display: flex; align-items: center; justify-content: center;
  transition: color var(--transition);
  background: rgba(0,0,0,.35);
  border-radius: 50%;
}
.lightbox__prev:hover, .lightbox__next:hover { color: #fff; background: rgba(0,0,0,.55); }
.lightbox__prev { left: -60px; }
.lightbox__next { right: -60px; }
.lightbox__thumbs {
  display: flex; gap: 8px;
  margin-top: 16px;
  overflow-x: auto; -webkit-overflow-scrolling: touch;
  max-width: 90vw;
  scrollbar-width: none;
}
.lightbox__thumbs::-webkit-scrollbar { display: none; }
.lightbox__thumb {
  width: 56px; height: 56px;
  border-radius: 6px;
  object-fit: cover;
  cursor: pointer;
  opacity: .5;
  border: 2px solid transparent;
  transition: opacity var(--transition), border-color var(--transition);
  flex-shrink: 0;
}
.lightbox__thumb:hover { opacity: .8; }
.lightbox__thumb--active { opacity: 1; border-color: #fff; }
.lightbox__counter {
  color: rgba(255,255,255,.7);
  font-size: .75rem;
  margin-top: 8px;
}

/* ── Responsive ── */
@media (max-width: 1100px) {
  .product-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 768px) {
  .product-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .filters__bar { flex-wrap: wrap; }
  .filters__search { width: 100%; order: -1; }
  .catalog { padding: 16px 12px 80px; }
  .product-card__info { padding: 10px 12px 14px; }
  .product-card__name { font-size: .8125rem; }
  .lightbox__prev { left: 4px; }
  .lightbox__next { right: 4px; }
  .lightbox__prev, .lightbox__next { font-size: 2rem; width: 40px; height: 40px; }
  .lightbox__img { max-width: 96vw; max-height: 65vh; }
}
@media (max-width: 420px) {
  .product-grid { grid-template-columns: repeat(2, 1fr); gap: 8px; }
  .product-card__info { padding: 8px 10px 12px; }
  .chip { padding: 5px 12px; font-size: .75rem; }
}