:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;--bg:#f6f7f9;--surface:#fff;--surface-soft:#f0f3f6;--line:#d8dee6;--line-strong:#b7c2cf;--text:#17202a;--muted:#5d6b7a;--accent:#0b7285;--accent-strong:#075d6d;--danger:#b42318;--shadow:0 12px 30px #151f2c14}*{box-sizing:border-box}html,body{min-height:100%}body{background:var(--bg);color:var(--text);margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;font-size:15px}button,input,select,textarea{font:inherit}button{border:1px solid var(--line-strong);background:var(--surface);min-height:38px;color:var(--text);cursor:pointer;border-radius:6px;padding:0 14px}button:hover:not(:disabled){border-color:var(--accent);color:var(--accent-strong)}button:disabled{cursor:not-allowed;opacity:.48}.app-header{border-bottom:1px solid var(--line);background:var(--surface);justify-content:space-between;align-items:center;gap:24px;min-height:78px;padding:16px 24px;display:flex}.app-header h1{margin:0;font-size:22px;font-weight:650}.app-header p{color:var(--muted);margin:4px 0 0}.header-actions{flex-wrap:wrap;justify-content:flex-end;gap:8px;display:flex}.workspace{grid-template-rows:minmax(360px,1fr) minmax(240px,34vh);grid-template-columns:minmax(300px,380px) minmax(360px,1fr);gap:16px;min-height:calc(100vh - 78px);padding:16px;display:grid}.panel{border:1px solid var(--line);background:var(--surface);min-width:0;box-shadow:var(--shadow);border-radius:8px}.inputs-panel{flex-direction:column;grid-row:1/span 2;gap:14px;padding:16px;display:flex}.output-panel,.json-panel{flex-direction:column;display:flex}.panel-title{border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;gap:12px;min-height:48px;padding:0 16px;display:flex}.inputs-panel .panel-title{border-bottom:0;min-height:auto;padding:0}.panel-title h2{margin:0;font-size:15px;font-weight:650}.panel-title span{color:var(--muted);font-size:13px}.drop-zone{border:1px dashed var(--line-strong);background:linear-gradient(45deg, #0b72850d 25%, transparent 25%), linear-gradient(-45deg, #0b72850d 25%, transparent 25%), var(--surface-soft);background-size:18px 18px;border-radius:8px;outline:none;place-items:center;min-height:150px;transition:border-color .14s,background-color .14s;display:grid;position:relative}.drop-zone.is-active{border-color:var(--accent);background-color:#e8f7fa}.drop-zone input{opacity:0;cursor:pointer;position:absolute;inset:0}.drop-zone-copy{text-align:center;pointer-events:none;gap:4px;display:grid}.drop-zone-copy strong{font-size:16px}.drop-zone-copy span{color:var(--muted);font-size:13px}.controls-grid{grid-template-columns:1fr;gap:10px;display:grid}label{color:var(--muted);gap:6px;font-size:13px;display:grid}input,select,textarea{border:1px solid var(--line-strong);width:100%;color:var(--text);background:#fff;border-radius:6px}input,select{min-height:38px;padding:0 10px}#generateButton{border-color:var(--accent);background:var(--accent);color:#fff;font-weight:650}#generateButton:hover:not(:disabled){border-color:var(--accent-strong);background:var(--accent-strong);color:#fff}.file-list{align-content:start;gap:8px;height:280px;padding-right:2px;display:grid;overflow:hidden auto}.file-item{border:1px solid var(--line);background:#fff;border-radius:6px;grid-template-columns:44px minmax(0,1fr);align-items:center;gap:10px;min-height:56px;padding:6px;display:grid}.file-thumb{object-fit:contain;border:1px solid var(--line);background-color:#fff;background-image:linear-gradient(45deg,#e7ebef 25%,#0000 25%),linear-gradient(-45deg,#e7ebef 25%,#0000 25%),linear-gradient(45deg,#0000 75%,#e7ebef 75%),linear-gradient(-45deg,#0000 75%,#e7ebef 75%),none;background-position:0 0,0 6px,6px -6px,-6px 0;background-repeat:repeat,repeat,repeat,repeat,repeat;background-size:12px 12px;background-attachment:scroll,scroll,scroll,scroll,scroll;background-origin:padding-box,padding-box,padding-box,padding-box,padding-box;background-clip:border-box,border-box,border-box,border-box,border-box;border-radius:4px;width:44px;height:44px}.file-meta{min-width:0}.file-name,.sprite-name{text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.file-name{font-weight:600}.sprite-name{color:var(--muted);margin-top:3px;font-size:12px}.canvas-shell{background-color:#fff;background-image:linear-gradient(45deg,#e4e8ed 25%,#0000 25%),linear-gradient(-45deg,#e4e8ed 25%,#0000 25%),linear-gradient(45deg,#0000 75%,#e4e8ed 75%),linear-gradient(-45deg,#0000 75%,#e4e8ed 75%),none;background-position:0 0,0 10px,10px -10px,-10px 0;background-repeat:repeat,repeat,repeat,repeat,repeat;background-size:20px 20px;background-attachment:scroll,scroll,scroll,scroll,scroll;background-origin:padding-box,padding-box,padding-box,padding-box,padding-box;background-clip:border-box,border-box,border-box,border-box,border-box;flex:1;padding:16px;overflow:auto}.canvas-shell.is-solid{background:var(--preview-bg,#fff)}.preview-controls{align-items:center;gap:10px;display:flex}.preview-bg-control{color:var(--muted);align-items:center;gap:6px;margin:0;font-size:13px;display:flex}.preview-bg-control select{padding:4px 8px;font-size:13px}#previewBgColor{border:1px solid var(--line-strong);cursor:pointer;background:0 0;border-radius:6px;width:28px;height:24px;padding:0}#spritesheetCanvas{border:1px solid var(--line-strong);width:auto;max-width:100%;height:auto;image-rendering:pixelated;background:0 0;display:block}#jsonOutput{resize:none;border:0;border-radius:0 0 8px 8px;flex:1;min-height:0;padding:14px 16px;font-family:SFMono-Regular,Consolas,Liberation Mono,monospace;font-size:12px;line-height:1.5}.is-error{color:var(--danger)}@media (max-width:900px){.app-header{flex-direction:column;align-items:flex-start}.header-actions{justify-content:flex-start}.workspace{grid-template-rows:auto minmax(320px,52vh) minmax(260px,42vh);grid-template-columns:1fr}.inputs-panel{grid-row:auto}}