*{box-sizing:border-box} :root{--bg:#f4f6f9;--panel:#fff;--line:#e3e8ef;--text:#1e293b;--muted:#718096;--blue:#2563eb;--blue-light:#eff6ff;--danger:#dc2626;--shadow:0 1px 3px rgba(15,23,42,.05)}
body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;font-size:13px}
button,input,select{font:inherit}button{cursor:pointer}.topbar{height:76px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 22px;gap:18px}
.brand{display:flex;align-items:center;gap:12px;min-width:230px}.brand-mark{width:40px;height:40px;display:grid;place-items:center;border-radius:12px;background:#e8efff;color:#2459cb;font-size:25px}.brand h1{font-size:16px;margin:0 0 4px;font-weight:700}.brand p{margin:0;color:var(--muted);font-size:11px}.top-actions{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.separator{height:25px;border-left:1px solid var(--line);margin:0 4px}
.btn{border:1px solid transparent;border-radius:7px;padding:9px 12px;font-weight:600;white-space:nowrap;transition:.15s}.btn:disabled{opacity:.4;cursor:not-allowed}.btn.primary{background:var(--blue);color:white}.btn.primary:hover{background:#1d4ed8}.btn.secondary{background:#fff;border-color:#d8e0eb;color:#344256}.btn.secondary:hover,.btn.subtle:hover{background:#f1f5f9}.btn.subtle{background:transparent;color:#475569}.btn.danger{background:#fff1f2;color:#be123c;border-color:#fecdd3}.btn.full{width:100%;justify-content:center}.btn.small{padding:6px 9px;font-size:11px}.icon-btn{border:1px solid var(--line);border-radius:7px;background:white;width:31px;height:31px;color:#475569;font-size:19px;display:inline-grid;place-items:center}.workspace{display:grid;grid-template-columns:250px minmax(360px,1fr) 270px;gap:12px;padding:12px;height:calc(100vh - 76px);min-height:580px}
.sidebar,.canvas-panel{background:var(--panel);border:1px solid var(--line);border-radius:10px;min-height:0;box-shadow:var(--shadow)}.sidebar{overflow:auto}.panel-section{padding:16px;border-bottom:1px solid #edf0f4}.panel-section:last-child{border-bottom:0}.panel-section h2{font-size:13px;margin:0 0 12px}.section-heading{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px}.section-heading h2{margin:0 0 4px}.section-heading p{margin:0;color:var(--muted);font-size:11px}.type-list{display:flex;flex-direction:column;gap:8px;margin-bottom:12px}.type-card{border:1px solid var(--line);border-radius:8px;padding:10px;display:flex;align-items:center;gap:10px;cursor:pointer;background:#fff}.type-card.active{border-color:#7aa2ff;background:#f5f8ff;box-shadow:0 0 0 1px #dbe7ff}.type-preview{width:43px;height:37px;border:1.5px solid #53657c;border-radius:3px;flex-shrink:0;display:grid;place-items:center;font-size:10px;color:#334155}.type-meta{flex:1;min-width:0}.type-meta strong{display:block;font-size:12px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.type-meta small{display:block;color:var(--muted);font-size:11px;margin-top:4px}.type-count{font-size:10px;color:#64748b;background:#eef2f7;border-radius:5px;padding:4px 5px}.hint{color:#8994a5;font-size:10px;line-height:1.55;margin:10px 0 0}.inventory-list{display:flex;flex-direction:column;gap:9px}.inventory-row{display:flex;align-items:center;gap:7px;font-size:11px}.inventory-row .swatch{width:9px;height:9px;border-radius:3px}.inventory-row .inv-name{flex:1}.inventory-row .inv-count{font-variant-numeric:tabular-nums;color:#64748b}.check-row{display:flex;gap:8px;align-items:center;margin:12px 0;color:#475569;font-size:12px}.check-row input{accent-color:var(--blue)}.field-row{display:flex;align-items:center;justify-content:space-between;font-size:11px;color:#64748b;margin:12px 0}.field-row select{border:1px solid var(--line);border-radius:6px;padding:5px;background:white;color:var(--text)}
.canvas-panel{display:flex;flex-direction:column;overflow:hidden}.canvas-toolbar{height:54px;border-bottom:1px solid #edf0f4;display:flex;align-items:center;justify-content:space-between;padding:0 14px;gap:8px}.canvas-title{display:flex;align-items:baseline;gap:10px}.canvas-title strong{font-size:13px}.canvas-title span{font-size:10px;color:var(--muted)}.canvas-actions{display:flex;align-items:center;gap:7px}.zoom-label{min-width:40px;text-align:center;font-size:11px;color:#64748b;font-variant-numeric:tabular-nums}.canvas-wrap{position:relative;flex:1;min-height:0;background:#fbfcfe;overflow:hidden}.canvas-wrap canvas{display:block;width:100%;height:100%;touch-action:none;cursor:default}.empty-state{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);display:flex;align-items:center;flex-direction:column;gap:8px;color:#64748b;pointer-events:none;text-align:center}.empty-state strong{font-size:13px;color:#475569}.empty-state span{font-size:11px}.empty-icon{width:43px;height:43px;display:grid;place-items:center;border-radius:12px;background:#eef2f8;color:#9aa7b8;font-size:24px}.canvas-footer{height:30px;border-top:1px solid #edf0f4;padding:0 12px;display:flex;align-items:center;justify-content:space-between;color:#8a95a5;font-size:10px;gap:8px}
.selected-name{display:flex;align-items:center;gap:9px;margin-bottom:15px}.selected-name strong{display:block;font-size:12px}.selected-name small{display:block;color:var(--muted);font-size:10px;margin-top:3px}.swatch{display:inline-block;width:12px;height:12px;border-radius:3px;flex-shrink:0}.property-form label{display:flex;flex-direction:column;gap:6px;color:#64748b;font-size:10px}.two-fields{display:grid;grid-template-columns:1fr 1fr;gap:9px;margin-bottom:11px}.property-form input{width:100%;border:1px solid #dbe2eb;border-radius:6px;padding:8px;color:var(--text);background:#fff;font-size:12px;min-width:0}.property-buttons{display:grid;grid-template-columns:1fr 1fr;gap:7px;margin:8px 0}.property-form>.btn{margin-top:7px}.hidden{display:none!important}.no-selection{display:flex;flex-direction:column;align-items:center;gap:8px;padding:12px 0 16px;color:#94a3b8;text-align:center}.no-selection strong{font-size:12px;color:#64748b}.no-selection span{font-size:10px}.stats-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px}.stat-card{border:1px solid #e9edf3;border-radius:8px;padding:10px;background:#fcfdff}.stat-card span{display:block;color:#7b8798;font-size:10px;margin-bottom:7px}.stat-card strong{font-size:18px;font-variant-numeric:tabular-nums;letter-spacing:-.4px}.stat-card strong small{font-size:10px;color:#8a95a5;font-weight:500}.checks{margin-top:10px;display:flex;flex-direction:column;gap:7px}.check-result{display:flex;gap:7px;align-items:flex-start;padding:8px;border-radius:7px;background:#f0fdf4;color:#166534;font-size:10px;line-height:1.45}.check-result.warn{background:#fff7ed;color:#9a3412}.check-result.error{background:#fff1f2;color:#9f1239}.shortcut{display:flex;align-items:center;justify-content:space-between;margin:10px 0;color:#64748b;font-size:10px}kbd{font:10px -apple-system,BlinkMacSystemFont,sans-serif;border:1px solid #e0e5ed;background:#f8fafc;padding:3px 5px;border-radius:4px;color:#475569}
.toast{position:fixed;left:50%;bottom:28px;transform:translate(-50%,20px);padding:10px 15px;background:#1e293b;color:white;border-radius:8px;box-shadow:0 8px 30px #0f172a22;font-size:12px;opacity:0;pointer-events:none;transition:.2s;z-index:10;max-width:min(90vw,600px)}.toast.show{opacity:1;transform:translate(-50%,0)}
@media(max-width:1150px){.workspace{grid-template-columns:220px minmax(300px,1fr) 235px;padding:8px;gap:8px}.topbar{padding:0 12px}.brand{min-width:190px}.btn{padding:8px 9px}.panel-section{padding:12px}}
@media(max-width:900px){.topbar{height:auto;min-height:76px;align-items:flex-start;padding:12px;flex-direction:column}.top-actions{width:100%}.workspace{height:auto;min-height:0;grid-template-columns:1fr}.sidebar{overflow:visible}.canvas-panel{height:65vh;min-height:430px;order:-1}.type-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr))}.workspace{padding:8px}.right-panel{display:grid;grid-template-columns:1fr 1fr}.canvas-footer span:last-child{display:none}}

/* Dopamine color picker */
.color-picker-section{margin:2px 0 14px}.color-picker-section>label{display:block;margin-bottom:8px;color:#64748b;font-size:10px}.color-options{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:7px}.color-choice{min-width:0;border:1px solid #e2e8f0;border-radius:8px;background:#fff;padding:6px 3px;display:flex;flex-direction:column;align-items:center;gap:5px;color:#475569}.color-choice>span{display:block;width:28px;height:28px;border-radius:50%;background:var(--swatch-color);border:1px solid #00000012;box-shadow:inset 0 0 0 1px #ffffff40}.color-choice small{font-size:9px;white-space:nowrap}.color-choice.active{border-color:#334155;box-shadow:0 0 0 2px #cbd5e1;background:#f8fafc}.mini-palette{display:flex;gap:4px;margin-top:6px}.mini-palette i{width:10px;height:10px;border-radius:50%;border:1px solid #00000012}.type-meta{align-self:center}

/* Product-system overview inspired by the supplied modular storage reference */
.system-overview{margin:12px 12px 0;padding:18px 22px;border:1px solid #dbe5f2;border-radius:12px;background:linear-gradient(115deg,#fff 0%,#fff 56%,#fff4e9 100%);display:flex;align-items:center;justify-content:space-between;gap:20px;overflow:hidden}
.overview-copy{min-width:0}.overview-eyebrow{font-size:10px;font-weight:800;letter-spacing:2px;color:#f97316;margin-bottom:7px}.overview-copy h2{font-size:clamp(17px,2vw,25px);letter-spacing:-.5px;margin:0 0 7px;color:#111827}.overview-copy p{margin:0;color:#64748b;font-size:12px;line-height:1.6}.feature-chips{display:flex;flex-wrap:wrap;gap:7px;margin-top:13px}.feature-chips span{padding:6px 9px;border:1px solid #fed7aa;border-radius:999px;background:#fffaf5;color:#9a3412;font-size:10px;font-weight:650}.overview-side{display:grid;grid-template-columns:repeat(3,minmax(82px,1fr));gap:8px;flex-shrink:0}.overview-stat{min-width:82px;padding:11px 10px;border-radius:10px;background:#ffffffd9;border:1px solid #edf0f4;text-align:center}.overview-stat strong{display:block;color:#f97316;font-size:25px;line-height:1.1}.overview-stat span,.overview-stat small{display:block}.overview-stat span{font-size:11px;font-weight:700;margin-top:5px}.overview-stat small{font-size:9px;color:#94a3b8;margin-top:4px}
.spec-ribbon{margin:10px 12px 0;padding:12px 16px;border:1px solid #dbe5f2;border-radius:12px;background:#fff}.spec-ribbon-heading{display:flex;align-items:baseline;gap:10px;margin-bottom:10px}.spec-ribbon-heading strong{font-size:13px}.spec-ribbon-heading span{font-size:10px;color:#8491a3}.preset-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px}.preset-card{display:flex;flex-direction:column;align-items:flex-start;gap:4px;padding:10px 12px;border:1px solid #e5eaf1;border-radius:9px;background:linear-gradient(135deg,#fff,#fffaf6);text-align:left;transition:transform .15s,border-color .15s}.preset-card:hover{transform:translateY(-1px);border-color:#fb923c}.preset-size{font-size:10px;font-weight:800;color:#f97316}.preset-card strong{font-size:13px;color:#1f2937}.preset-card small{font-size:10px;color:#8491a3}.spec-note{margin:9px 0 0;font-size:10px;line-height:1.5;color:#8a95a5}.workspace{height:calc(100vh - 245px);min-height:500px}
@media(max-width:900px){.system-overview{margin:8px;align-items:flex-start;flex-direction:column;padding:15px}.overview-side{width:100%;grid-template-columns:repeat(3,1fr)}.spec-ribbon{margin:8px;padding:12px}.preset-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.spec-ribbon-heading{align-items:flex-start;flex-direction:column;gap:4px}.workspace{height:auto;min-height:0}}
@media(max-width:520px){.feature-chips span{font-size:9px}.overview-side{gap:5px}.overview-stat{min-width:0;padding:9px 5px}.overview-stat strong{font-size:21px}.preset-card{padding:9px}.preset-card strong{font-size:12px}}

.config{margin:14px 20px;background:white;border:1px solid #e0e8ef;border-radius:16px;padding:16px 20px}.config-title{display:flex;align-items:center;gap:18px;margin-bottom:13px}.config-title h2{font-size:19px;margin:0}.config-title span{color:#718096;font-size:12px}.tabs{display:grid;grid-template-columns:1.25fr 1.1fr 1fr 1fr;gap:18px}.tab{min-width:0}.tab>strong{display:block;margin-bottom:10px;font-size:13px}.tab-options{display:flex;gap:6px;flex-wrap:wrap}.tab-option{background:#f5f7fb;border:1px solid #dce3eb;border-radius:9px;padding:8px 11px;cursor:pointer;font-size:12px;font-weight:700;color:#475569}.tab-option.active{border-color:#f97316;background:#fff1e6;color:#b45309;box-shadow:0 0 0 1px #f97316}.tab-option .dot{display:inline-block;width:15px;height:15px;border-radius:50%;vertical-align:middle;margin-right:5px;border:1px solid #b4bbc4}.type-card{display:flex;gap:8px;align-items:center}.type-preview{width:90px;min-width:90px;height:65px;display:flex;align-items:center;justify-content:center;background:#f5f7fb!important;border-radius:7px;overflow:hidden}.type-preview img{max-width:100%;max-height:100%;object-fit:contain}.type-count{display:none}.type-meta small{font-size:11px}.type-list{max-height:calc(100vh - 380px);overflow:auto}.inventory-section{display:none}.workspace{min-height:610px}.left-panel{min-width:250px}.color-options{display:flex;flex-wrap:wrap;gap:7px}.color-choice{width:46px}.color-choice small{font-size:10px}.color-choice span{background:var(--swatch-color)}@media(max-width:1050px){.tabs{grid-template-columns:1fr 1fr}.config{margin:10px}}@media(max-width:600px){.tabs{grid-template-columns:1fr}.config-title{display:block}}
/* V4: correct layout for functional configuration tabs */
.workspace{height:calc(100vh - 252px);min-height:560px}.config{margin:12px 14px}.type-preview{border:1px solid #e3e8ef}.type-preview img{width:100%;height:100%;object-fit:contain}.property-form input[readonly]{background:#f1f5f9;color:#64748b}.tab-option:hover{border-color:#fb923c}@media(max-width:900px){.workspace{height:auto;min-height:0}.type-list{max-height:none}}

/* V13 price and depth */
.tabs{grid-template-columns:1.15fr 1.05fr .9fr .85fr 1.15fr;gap:12px}
.type-price{display:block;margin-top:6px;font-size:14px;font-weight:800;color:#b45309;font-variant-numeric:tabular-nums}
.depth-property{padding:10px;margin-bottom:13px;border:1px solid #e5eaf1;border-radius:9px;background:#f8fafc}
.depth-property label{display:flex;flex-direction:column;gap:6px;font-size:11px;color:#475569}
.depth-property select{width:100%;border:1px solid #dbe2eb;background:white;border-radius:7px;padding:8px}
.depth-property .btn{margin-top:9px}
.price-summary{display:flex;flex-direction:column;gap:10px}
.price-summary>div{display:flex;flex-direction:column;gap:5px;border:1px solid #e7ebf1;padding:12px;border-radius:9px}
.price-summary span{font-size:11px;color:#64748b}
.price-summary strong{font-size:23px;color:#b45309;font-variant-numeric:tabular-nums}
.price-summary small{color:#8a95a5;font-size:10px;line-height:1.6}
@media(max-width:1300px){.tabs{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media(max-width:900px){.tabs{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:600px){.tabs{grid-template-columns:1fr}}

/* V18: library cards can be dragged onto the canvas */
.type-card[draggable="true"]{cursor:grab;user-select:none}.type-card[draggable="true"]:active{cursor:grabbing}

/* Depth constraint rejection: red text warning. */
.toast.error{color:#b91c1c;background:#fff1f2;border:1px solid #fca5a5;font-weight:700}

/* Purchase contact: visible on desktop, tablets and phones */
.topbar{position:relative}
.top-contact{position:absolute;left:50%;transform:translateX(-50%);max-width:calc(100% - 920px);text-align:center;white-space:nowrap;color:#002FA7;font-size:18px;font-weight:700;pointer-events:none}
/* Keep contact centered on the SAME header row when space permits. */
@media (min-width:1101px) and (max-width:1500px){
  .top-contact{font-size:clamp(13px,1.15vw,16px);max-width:none}
}
/* Only stack the contact on genuinely narrow screens. */
@media(max-width:1100px){
  .topbar{height:auto;min-height:76px;flex-wrap:wrap;justify-content:space-between;row-gap:10px;padding-top:12px;padding-bottom:12px}
  .top-contact{position:static;transform:none;order:3;flex:0 0 100%;max-width:100%;white-space:normal;font-size:16px;line-height:1.5;overflow-wrap:anywhere}
}


/* Independent cart UI: does not change the designer workspace. */
.cart-backdrop{position:fixed;inset:0;background:rgba(15,23,42,.38);z-index:9990}
.cart-backdrop[hidden]{display:none!important}
.cart-drawer{position:fixed;top:0;right:0;bottom:0;width:min(440px,100vw);box-sizing:border-box;background:#fff;z-index:9991;box-shadow:-8px 0 28px rgba(15,23,42,.18);transform:translateX(105%);transition:transform .2s ease;display:flex;flex-direction:column;padding:20px;visibility:hidden}
.cart-drawer.is-open{transform:translateX(0);visibility:visible}
.cart-head{display:flex;justify-content:space-between;align-items:center;gap:10px}.cart-head h2{margin:0;font-size:21px}.cart-tip{color:#64748b;font-size:12px;line-height:1.5}
.cart-items{flex:1;overflow:auto;min-height:0}.cart-item{padding:16px 0;border-bottom:1px solid #e2e8f0;display:flex;flex-direction:column;gap:8px}.cart-item strong{font-size:14px}.cart-item small{color:#64748b;overflow-wrap:anywhere}.cart-item-actions{display:flex;align-items:center;justify-content:space-between;gap:8px}.cart-qty{display:flex;align-items:center;gap:6px}.cart-qty span{min-width:20px;text-align:center;font-weight:700}.cart-qty .btn{padding:5px 8px}.cart-empty{padding:30px 8px;color:#64748b;line-height:1.7}.cart-foot{border-top:1px solid #e2e8f0;padding-top:16px}.cart-total{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}.cart-total strong{font-size:22px;color:#1e40af}.cart-visible{overflow:hidden}
@media(max-width:900px){.cart-drawer{width:100vw;max-width:none;padding:16px}.top-actions #addCartBtn,.top-actions #openCartBtn{white-space:nowrap}}

/* V43: contact occupies its own grid column; never overlays action buttons. */
@media(min-width:1101px){
  .topbar{display:grid;grid-template-columns:max-content minmax(0,1fr) max-content;align-items:center;column-gap:16px;height:auto;min-height:76px}
  .top-contact{position:static;left:auto;transform:none;max-width:none;min-width:0;white-space:normal;overflow-wrap:anywhere;line-height:1.35;text-align:center;pointer-events:auto;user-select:text;-webkit-user-select:text}
  .top-actions{justify-content:flex-end}
}
@media(max-width:1100px){
  .top-contact{pointer-events:auto;user-select:text;-webkit-user-select:text}
}

/* V46: optional removable divider accessories; no changes to canvas layout */
.accessory-hint{display:block;margin-top:7px;color:#8a95a5;font-size:11px;line-height:1.5}
#accessoryTabs .tab-option{white-space:nowrap}

/* V49: six specification groups on one row on wide desktop screens. */
@media (min-width: 1500px) {
  .config .tabs {grid-template-columns:1.42fr 1.27fr 1.04fr .76fr 1.03fr 1.22fr;gap:9px;align-items:start}
  .config .tab-options {gap:4px}
  .config .tab-option {padding:7px 8px;font-size:11px}
  .config .tab-option .dot {width:13px;height:13px;margin-right:3px}
  .config .tab > strong {font-size:12px;margin-bottom:8px}
  .config .accessory-hint {font-size:10px}
}

/* V50: actual six-column layout and compact fixed 3x2 / 2x2 choices. */
@media (min-width: 1200px) {
  .config .tabs {
    display:grid;
    grid-template-columns:minmax(0,1.5fr) minmax(0,1.35fr) minmax(0,1fr) minmax(0,.75fr) minmax(0,1.05fr) minmax(0,1.25fr);
    gap:8px;
    align-items:start;
  }
  .config .tab {min-width:0}
  .config .tab-options {gap:4px}
  .config .tab-option {padding:6px 7px;font-size:11px;min-width:0}
  .config .tab > strong {font-size:12px;margin-bottom:7px}
  .config #colorTabs {display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:4px}
  .config #widthTabs {display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px}
  .config #colorTabs .tab-option,.config #widthTabs .tab-option {width:100%;box-sizing:border-box;white-space:nowrap;padding-left:5px;padding-right:5px}
  .config #colorTabs .tab-option {display:flex;align-items:center;justify-content:center;gap:3px}
  .config #colorTabs .dot {flex-shrink:0;margin-right:2px}
}

/* V51: compact width options and mode-dependent divider dropdown. */
.config #widthTabs .tab-option{padding:5px 4px;font-size:10px;min-height:0;line-height:1.25}
@media(min-width:1200px){
  .config .tabs{grid-template-columns:minmax(0,1.5fr) minmax(0,1.12fr) minmax(0,1fr) minmax(0,.75fr) minmax(0,1.05fr) minmax(0,1.45fr)}
  .config #widthTabs .tab-option{padding:5px 3px;font-size:10px}
}
.config .accessory-select{display:block;width:100%;max-width:100%;box-sizing:border-box;min-width:0;padding:8px 28px 8px 9px;border:1px solid #dbe2eb;border-radius:8px;background:#f8fafc;color:#334155;font-size:12px;font-weight:600;cursor:pointer}
.config .accessory-select:focus{outline:2px solid #fb923c;outline-offset:1px}

/* V53: match accessory dropdown text to its section heading */
.config .accessory-select{font-size:12px;font-weight:700}

/* V54: restore classic header appearance while keeping cart implementation available. */
.top-actions #addCartBtn,.top-actions #openCartBtn{display:none!important}

/* V55: optional divider image preview; no changes to existing canvas/layout. */
.accessory-preview-row{display:flex;align-items:stretch;gap:6px;min-width:0}
.accessory-preview-row .accessory-select{flex:1;min-width:0;width:0}
.accessory-preview-btn{white-space:nowrap;flex-shrink:0;padding:7px 10px;font-size:12px;font-weight:700;border:1px solid #2563eb;border-radius:8px;background:#fff;color:#1d4ed8;cursor:pointer}
.accessory-preview-btn:hover{background:#eff6ff}
.accessory-preview-property{margin:7px 0 2px}
.accessory-preview-backdrop[hidden]{display:none!important}
.accessory-preview-backdrop{position:fixed;inset:0;z-index:99999;background:rgba(15,23,42,.55);display:flex;align-items:center;justify-content:center;padding:18px;box-sizing:border-box}
.accessory-preview-dialog{width:min(470px,100%);max-height:calc(100vh - 36px);overflow:auto;background:#fff;border-radius:14px;padding:18px;box-sizing:border-box;box-shadow:0 18px 50px rgba(0,0,0,.22)}
.accessory-preview-head{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:14px;font-size:17px;color:#1e293b}
.accessory-preview-close{font-size:27px;line-height:1;border:0;background:transparent;cursor:pointer;color:#475569;padding:2px 6px}
#accessoryPreviewImage{display:block;width:100%;height:auto;max-height:330px;object-fit:contain;background:#f8fafc;border-radius:9px}
.accessory-preview-meta{margin:12px 0 4px;font-size:13px;color:#475569}
.accessory-preview-note{margin:4px 0 0;font-size:11px;color:#94a3b8}

/* V56: Hide PNG export entry; retain its original code and event binding. */
#exportPngBtn{display:none !important;}
/* V52: interior grid editor and optional top covers */
.cover-library{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;margin:10px 0}.cover-card{border:1px solid #d6dce4;background:white;border-radius:8px;padding:8px;cursor:pointer;text-align:left;display:flex;flex-direction:column;gap:4px}.cover-card:hover{border-color:#427fa6}.cover-card strong{font-size:12px}.cover-card small{font-size:10px;color:#667085}.cover-thumb{height:24px;border-radius:5px;background:#dce5ed;border:2px solid #7b95a8}.cover-b{box-shadow:inset 0 0 0 5px #bacbd9}.cover-c{border:5px ridge #9aafc1}.cover-d{background:repeating-linear-gradient(45deg,#e6f4fc,#e6f4fc 6px,#ffffff 6px,#ffffff 12px)}.cover-e{background:repeating-linear-gradient(90deg,#bac8d6,#bac8d6 2px,#e6ecf2 2px,#e6ecf2 8px)}
.grid-backdrop{position:fixed;inset:0;background:rgba(16,24,40,.65);z-index:10000;display:flex;align-items:center;justify-content:center;padding:14px}.grid-backdrop[hidden]{display:none}.grid-dialog{width:min(900px,98vw);max-height:96vh;overflow:auto;background:#fff;border-radius:12px;box-shadow:0 20px 70px #0004;padding:18px}.grid-head,.grid-foot{display:flex;justify-content:space-between;align-items:center;gap:12px}.grid-content{display:grid;grid-template-columns:205px 1fr;gap:20px;margin:16px 0}.grid-content aside p{font-size:12px;color:#667085}.grid-main{overflow:auto;min-height:250px;background:#f3f6f9;padding:15px;border-radius:8px}.grid-canvas{position:relative;background:white;touch-action:none;border:2px solid #607d95}.grid-cell{position:absolute;border:1px solid #e4e9ef;box-sizing:border-box;pointer-events:auto}.grid-piece{position:absolute;display:flex;align-items:center;justify-content:center;z-index:2;cursor:grab;touch-action:none;user-select:none;box-sizing:border-box;border:2px solid #5d9db6;background:rgba(121,195,224,.75);border-radius:3px;font-size:12px;font-weight:700;color:#23485a}.grid-piece.selected{border:3px solid #d97706;background:#ffdf9d}.grid-palette-item{width:100%;display:flex;align-items:center;gap:6px;background:white;border:1px solid #d7e0e8;border-radius:7px;padding:7px;margin-bottom:7px;cursor:grab}.grid-palette-item strong{font-size:11px}.grid-palette-item small{margin-left:auto;font-size:11px}.grid-icon{width:calc(var(--cw)*12px);height:calc(var(--ch)*12px);background:#b5e1f0;border:1px solid #588ba2;flex-shrink:0}.grid-status{font-size:12px;color:#64748b;margin-top:10px}.grid-foot{flex-wrap:wrap}.grid-foot>div{display:flex;gap:6px;flex-wrap:wrap}@media(max-width:650px){.grid-content{grid-template-columns:1fr}.grid-content aside{max-height:150px;overflow:auto}}

/* V53: selected grid component and clearer cover action */
.grid-palette-item.selected{border:2px solid #2563eb;background:#eff6ff;box-shadow:0 0 0 1px #93c5fd;}
.cover-remove-btn{border:2px solid #2563eb!important;color:#1d4ed8!important;background:#eff6ff!important;}

/* V57: distribute all five specification groups across the available width. */
@media (min-width: 1200px) {
  .config .tabs {
    grid-template-columns: minmax(0,1.48fr) minmax(0,1.22fr) minmax(0,.88fr) minmax(0,.65fr) minmax(0,1.02fr);
    gap: 12px;
  }
  .config #depthTabs {display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:4px}
  .config #depthTabs .tab-option {min-width:0;padding-left:3px;padding-right:3px;text-align:center}
}

/* V60: real cover photos and selected cover highlight */
.cover-photo{display:block;width:100%;height:92px;object-fit:contain;background:#fff;border-radius:5px}
.cover-card.cover-card-selected{border:2px solid #2563eb;background:#eff6ff;box-shadow:0 0 0 1px #93c5fd}