/* Lightbox */
#lightbox { display:none; position:fixed; inset:0; background:rgba(0,0,0,0.92); z-index:1000; align-items:center; justify-content:center; }
#lightbox.open { display:flex; }
#lightbox img { max-width:90vw; max-height:90vh; object-fit:contain; border-radius:5px; }
#lightbox-close { position:absolute; top:20px; right:24px; color:#fff; font-size:32px; cursor:pointer; line-height:1; user-select:none; }

/* Галерея */
.item-gallery-main { position:relative; border-radius:5px; overflow:hidden; aspect-ratio:439/429; background:#f8f8f8; }
.item-gallery-main img { width:100%; height:100%; object-fit:cover; display:block; }
.item-gallery-thumbs-wrap { display:flex; align-items:center; gap:8px; padding:4px 0; }
.item-gallery-thumbs-viewport { flex:1; overflow:hidden; padding:3px 3px; }
.item-gallery-thumbs { display:flex; gap:10px; transition:transform 0.25s ease; }
.item-gallery-thumb { flex:0 0 calc((100% - 20px) / 3); height:70px; border-radius:2px; cursor:pointer; opacity:0.6; transition:opacity 0.2s; position:relative; }
.item-gallery-thumb img { width:100%; height:100%; object-fit:cover; display:block; border-radius:2px; }
.item-gallery-thumb.active { opacity:1; outline:2px solid #16627d; outline-offset:1px; }
.thumb-nav-btn { display:flex; align-items:center; justify-content:center; width:26px; height:26px; flex-shrink:0; background:#16627d; border-radius:3px; cursor:pointer; transition:opacity 0.2s; z-index:5; position:relative; }
.thumb-nav-btn.hidden { opacity:0; pointer-events:none; }
@media (max-width:1023px) {
  .item-gallery-thumbs-wrap { gap:0; padding:4px 0; }
  .item-gallery-thumbs-viewport { overflow-x:auto; scrollbar-width:none; -ms-overflow-style:none; }
  .item-gallery-thumbs-viewport::-webkit-scrollbar { display:none; }
  .item-gallery-thumbs { transform:none !important; transition:none; }
  .item-gallery-thumb { flex:0 0 70px; }
  .thumb-nav-btn { display:none !important; }
}

/* Кастомный radio-checkbox */
.choose-checkbox { flex-shrink:0; width:20px; height:20px; border:0.5px solid #202020; border-radius:2px; background:#fff; position:relative; transition:background 0.15s, border-color 0.15s; }
input[type="radio"]:checked + .choose-checkbox { background:#16627d; border-color:#16627d; }
input[type="radio"]:checked + .choose-checkbox::after { content:''; position:absolute; left:50%; top:45%; width:5px; height:9px; border:1px solid #fff; border-top:none; border-left:none; transform:translate(-50%,-50%) rotate(45deg); }

/* Характеристики */
.spec-row { display:flex; align-items:flex-start; border-bottom:0.5px solid #999; padding-bottom:20px; }
.spec-label { flex:0 0 50%; font-size:14px; font-weight:500; color:#202020; }
.spec-value { flex:1; font-size:14px; font-weight:400; color:#202020; line-height:1.6; }

/* Цвет/фактура — свотчи */
.color-swatch-label { cursor:pointer; flex-shrink:0; }
.color-swatch { display:block; width:30px; height:30px; border-radius:2px; outline:1.5px solid transparent; outline-offset:1px; transition:outline-color 0.15s; overflow:hidden; }
.color-swatch-label input:checked ~ .color-swatch { outline-color:#c40f0f; }

/* Кнопки (button-тип) */
.thickness-label { cursor:pointer; }
.thickness-btn { display:inline-flex; align-items:center; height:30px; padding:0 12px; border:1px solid #e3e1e1; border-radius:2px; font-size:13px; color:#202020; background:#fff; transition:border-color 0.15s; }
.thickness-label input:checked ~ .thickness-btn { border-color:#c40f0f; }

/* Калькулятор */
.qty-btn { width:50px; height:50px; background:#f8f8f8; border-radius:5px; display:flex; align-items:center; justify-content:center; cursor:pointer; font-size:18px; color:#202020; user-select:none; }
.qty-display { width:50px; height:50px; background:#f8f8f8; border-radius:5px; display:flex; align-items:center; justify-content:center; font-size:16px; font-weight:500; color:#252525; }

.bsb-opt-unavail { opacity:0.35; pointer-events:none; cursor:default; }
.bsb-opt-unavail .thickness-btn,
.bsb-opt-unavail .color-swatch { position:relative; }
.bsb-opt-unavail .thickness-btn::after { content:''; position:absolute; left:10%; top:50%; width:80%; height:1px; background:#999; transform:translateY(-50%) rotate(-12deg); pointer-events:none; }
.bsb-stock-note { font-size:12px; color:#c00; margin-top:4px; display:none; }
.bsb-stock-note.visible { display:block; }

/* Похожие товары */
.similar-card { flex-shrink:0; width:239px; display:flex; flex-direction:column; gap:15px; }
.similar-card-img { width:100%; height:225px; border-radius:5px; overflow:hidden; background:#f8f8f8; position:relative; user-select:none; }
#similar-wrapper { overflow:hidden; }
#similar-track { display:flex; gap:20px; transition:transform 0.3s ease; }
@media (max-width:1023px) {
  .similar-card { width:70vw; }
  #similar-track { overflow-x:auto; scrollbar-width:none; -ms-overflow-style:none; }
  #similar-track::-webkit-scrollbar { display:none; }
}