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@media(max-width:1100px){.header{gap:12px}.header nav{gap:16px}.category-strip>a{padding-inline:14px}.product-page-grid{gap:28px}}
@media(max-width:760px){.header-actions{gap:8px}.header .cart-button{font-size:.8rem}.header nav{display:none}.category-strip>a:nth-child(3){border-left:0;padding-left:0}.category-strip>a:nth-child(n+3){padding-top:19px;border-top:1px solid var(--line)}.category-strip>a:nth-child(2n){padding-right:0;padding-left:16px}.product-page-grid{grid-template-columns:1fr}.product-page h1,.article-page h1,.page-intro h1{font-size:2rem}.product-page .photo-visual img{height:260px}.product-page .product-visual{min-height:260px}.product-page .detail-foot{flex-wrap:wrap}.product-page .detail-foot .primary{width:100%}.footer-links{width:100%;gap:12px}.related-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.related-grid .product-card:last-child{display:none}.hero h1{font-size:2.7rem;letter-spacing:-1px}}
@media(max-width:380px){.related-grid{grid-template-columns:1fr}.header .brand{font-size:1.4rem}.cart-button{gap:6px}.hero h1{font-size:2.4rem}}
.product-page .photo-visual{height:auto}
.header .brand,.footer .brand{font-size:1.65rem;letter-spacing:-1px}.filter-block select{width:100%;padding:10px;border:1px solid var(--line);background:#fff;color:var(--ink);border-radius:6px}.comparison,.faq{padding-block:40px 55px;min-width:0}.comparison h2,.faq h2{font-size:1.8rem;margin-bottom:18px}.comparison>p{max-width:880px;line-height:1.7}.table-scroll{overflow-x:auto;margin-block:24px;border:1px solid var(--line);border-radius:10px;max-width:100%}.compare-table{width:100%;border-collapse:collapse;min-width:670px;text-align:left}.compare-table caption{text-align:left;padding:16px;color:var(--muted);font-size:.85rem}.compare-table th,.compare-table td{padding:15px 18px;border-top:1px solid var(--line);vertical-align:top}.compare-table thead{background:#f1f5ed}.compare-table tbody th{width:23%;min-width:170px}.compare-table a{text-decoration:underline;text-underline-offset:3px}.compare-table small,.compare-details{display:block;margin-top:8px;line-height:1.5;font-size:.8rem}.compare-table small{max-width:330px}.compare-details{color:var(--muted)}.faq details{border-bottom:1px solid var(--line);padding:18px 0}.faq summary{cursor:pointer;font-weight:650;line-height:1.6}.faq details p{line-height:1.8;max-width:870px;margin-top:15px}.comparison .local-note{font-size:.85rem}
@media(max-width:760px){.header .brand{font-size:1.3rem}.comparison h2,.faq h2{font-size:1.5rem}.comparison,.faq{padding-block:28px 35px}.compare-table th,.compare-table td{padding:12px}.compare-table tbody th{position:sticky;left:0;background:#fff;box-shadow:1px 0 0 var(--line)}.table-scroll:focus-visible{outline:2px solid #548126;outline-offset:3px}}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;align-items:center}.hero-actions .secondary{padding:13px 20px}
/* KBattery: neutral product surfaces and a distinct purchase accent. */
:root {
  --ink: #14243b;
  --muted: #526174;
  --green: #19395b;
  --lime: #c4d5ef;
  --line: #dbe3ed;
  --surface: #f3f6fa;
  --action: #ff8a26;
  --action-hover: #ff9d48;
  --action-active: #f47a12;
  --action-border: #ad4800;
  --link: #174d88;
  --focus: #2563b5;
  --control-border: #76869a;
}
.demo-bar { background: #eef3f9; color: var(--muted); }
.brand-mark { background: var(--ink); color: var(--action); }
.brand-period, .hero h1 em, .tiny-plus, .guide-list article > span { color: var(--link); }
.header nav a:hover, .category-strip a:hover strong,
.category-strip button:hover strong { color: var(--link); }
.primary, .add-button {
  background: var(--action);
  border-color: var(--action-border);
  color: var(--ink);
  font-weight: 700;
  box-shadow: 0 2px 0 #14243b12;
}
.primary:hover, .add-button:hover { background: var(--action-hover); }
.primary:active, .add-button:active { background: var(--action-active); box-shadow: none; }
.secondary { border-color: var(--control-border); color: var(--ink); }
.secondary:hover, .cart-button:hover { background: var(--surface); }
.energy-panel {
  background-color: var(--ink);
  background-image: linear-gradient(135deg, #19395b, #101f34);
  color: var(--lime);
}
.energy-title { color: #fff; }
.panel-bottom { border-color: #637a98; }
.product-visual { background: #eef3f9; }
.product-visual.lifepo4 { background: #eaf1fa; }
.product-visual.materials { background: #f3f6fa; }
.product-visual.solidstate { background: #19395b; color: #e5eefb; }
.photo-visual { background: #fff; }
.sample-label, .visual-format { opacity: 1; color: var(--muted); }
.solidstate .sample-label, .solidstate .visual-format { color: #c4d5ef; }
.product-card:hover { box-shadow: 0 7px 25px #14243b14; }
.price, .cart-item-total { color: var(--ink); }
.details-link, .text-link, .compare-table a, .footer-links a { color: var(--link); }
.compare-table thead { background: #eef3f9; }
.search, select, .filter-block select,
.checkout-dialog input:not([type=checkbox]), .checkout-dialog textarea {
  border-color: var(--control-border);
}
.search:focus-within { outline: 3px solid var(--focus); outline-offset: 3px; }
button:focus-visible, a:focus-visible, input:focus-visible,
select:focus-visible, textarea:focus-visible, .table-scroll:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}
input[type=range], .checkbox input { accent-color: var(--link); }
.skip { background: var(--ink); color: #fff; }
/* Ordering, learning resources and the private seller interface. */
.add-button { width:auto; height:auto; min-height:44px; padding:10px 14px; border-radius:8px; font-size:.85rem; }
.product-price-row { flex-wrap:wrap; gap:12px; }
.cart-qty { width:64px; min-height:40px; text-align:center; border:1px solid var(--control-border); border-radius:5px; color:var(--ink); }
.product-quantity { display:flex; gap:10px; align-items:center; }
.product-quantity input { width:76px; padding:12px; border:1px solid var(--control-border); border-radius:6px; }
.checkout-dialog select { width:100%; padding:12px; border:1px solid var(--control-border); border-radius:6px; }
.purchase-terms { padding:18px; background:var(--surface); border:1px solid var(--line); border-radius:10px; margin-block:22px; }
.purchase-terms p { line-height:1.6; margin-top:8px; }
.np-picker { border:1px solid var(--line); border-radius:8px; padding:16px; margin-bottom:20px; }
.np-picker label { margin-top:15px; }
.np-picker p { margin-top:12px; font-size:.85rem; line-height:1.7; }
.draft-catalog { margin-top:32px; padding:20px; border:1px solid var(--line); border-radius:10px; }
.draft-catalog summary { cursor:pointer; font-weight:700; }
.draft-catalog p { margin-top:14px; line-height:1.7; }
.draft-links { display:flex; flex-wrap:wrap; gap:8px 25px; }
.learning { margin-block:44px 60px; }
.learning-grid { display:grid; grid-template-columns:repeat(3,minmax(0,1fr)); gap:22px; }
.learning-grid article { border:1px solid var(--line); border-radius:12px; padding:22px; }
.learning-grid p { font-size:.9rem; line-height:1.7; }
.article-models { display:flex; flex-wrap:wrap; gap:12px; margin-top:30px; }
.article-page li,#checkout-total li,#receipt li { margin:12px 0; line-height:1.6; }
.article-page ul,#checkout-total ul,#receipt ul { padding-left:22px; }
.admin-page { max-width:1150px; padding-block:36px 70px; }
.admin-heading,.admin-order-heading,.admin-toolbar { display:flex; flex-wrap:wrap; gap:14px; align-items:center; justify-content:space-between; }
.admin-heading h1 { margin:12px 0; }
.admin-login { max-width:500px; padding:24px; border:1px solid var(--line); border-radius:12px; }
.admin-login input { display:block; width:100%; padding:12px; border:1px solid var(--control-border); border-radius:6px; margin:12px 0; }
#admin-message { margin:20px 0; line-height:1.6; }
.admin-counts { display:grid; grid-template-columns:repeat(auto-fit,minmax(135px,1fr)); gap:12px; margin:20px 0 30px; }
.admin-counts > div { padding:18px; background:var(--surface); border:1px solid var(--line); border-radius:8px; }
.admin-counts span { display:block; font-size:.85rem; margin-bottom:12px; }
.admin-counts strong { font-size:1.7rem; }
.admin-toolbar { justify-content:flex-start; margin:20px 0; }
.admin-toolbar select { margin:8px 0 8px 12px; padding:12px; border:1px solid var(--control-border); border-radius:6px; }
.admin-order { padding:24px; border:1px solid var(--line); border-radius:12px; margin-block:18px; overflow-wrap:anywhere; }
.admin-order p,.admin-order li { margin-block:10px; line-height:1.6; }
.admin-order ul { padding-left:20px; }
.order-reference { color:var(--muted); font-size:.8rem; }
.payment-controls { border-top:1px solid var(--line); padding-top:18px; }
.payment-controls .checkbox { line-height:1.6; margin-bottom:15px; }
[hidden] { display:none !important; }
@media(max-width:1100px){.header nav { gap:11px; font-size:.82rem; }}
@media(max-width:760px){.learning-grid { grid-template-columns:1fr; }.add-button { width:100%; font-size:.8rem; }.admin-order { padding:16px; }.admin-toolbar label { width:100%; }.admin-toolbar select { max-width:100%; }.cart-qty { width:55px; }.article-page h1 { overflow-wrap:anywhere; }}