:root{font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Hiragino Sans GB,Microsoft YaHei,Segoe UI,sans-serif;color-scheme:light;--bg: #f5f5f5;--surface: #ffffff;--surface-raised: #fafafa;--ink: #1a1a1a;--ink-2: #444;--ink-3: #888;--border: #e0e0e0;--border-focus: #a0a0a0;--accent: #1a6b5a;--accent-hover: #135248;--accent-text: #ffffff;--radius: 6px;--ctrl-h: 32px;--pixel-cell-size: 28px}*{box-sizing:border-box}body{margin:0;min-height:100vh;background:var(--bg);color:var(--ink);-webkit-font-smoothing:antialiased}button,input,label{font:inherit;-webkit-tap-highlight-color:transparent}button{border:0;cursor:pointer}button:focus-visible,input:focus-visible{outline:2px solid var(--accent);outline-offset:1px}.app-shell{width:min(1640px,calc(100vw - 24px));margin:0 auto;padding:10px 0;display:flex;flex-direction:column;gap:10px;height:100vh;overflow:hidden}body{height:100vh;overflow:hidden}.topbar{display:flex;align-items:center;gap:16px;padding:0 16px;height:48px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius)}.brand-block h1{margin:0;font-size:15px;font-weight:600;color:var(--ink);white-space:nowrap}.tool-switcher-header{display:flex;gap:2px;padding:3px;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius)}.tool-switcher-header button{padding:0 14px;height:24px;border-radius:4px;background:transparent;color:var(--ink-3);font-size:13px;font-weight:500;transition:background .12s,color .12s}.tool-switcher-header button:hover{background:var(--surface);color:var(--ink)}.tool-switcher-header button.active{background:var(--surface);color:var(--ink);font-weight:600;box-shadow:0 1px 3px #00000014}.topbar-actions{display:flex;gap:6px;align-items:center;margin-left:auto}.primary-button,.secondary-button{display:inline-flex;align-items:center;justify-content:center;height:var(--ctrl-h);padding:0 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transparent}.panel::-webkit-scrollbar{width:5px}.panel::-webkit-scrollbar-thumb{background:var(--border);border-radius:9px}.panel-title{display:flex;justify-content:space-between;align-items:baseline;padding-bottom:8px;border-bottom:1px solid var(--border)}.panel-title h2{margin:0;font-size:13px;font-weight:600;color:var(--ink)}.panel-title p{margin:0;font-size:11px;color:var(--ink-3)}.upload-zone{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;min-height:80px;padding:14px;border:1px dashed var(--border);border-radius:var(--radius);background:var(--surface-raised);cursor:pointer;text-align:center;transition:border-color .15s}.upload-zone:hover{border-color:var(--border-focus)}.upload-zone input,.upload-icon{display:none}.upload-zone span{font-size:13px;font-weight:500;color:var(--ink-2)}.upload-zone small{font-size:11px;color:var(--ink-3)}.image-preview{display:flex;flex-direction:column;gap:6px}.image-preview img,.empty-preview{width:100%;aspect-ratio:16/10;border-radius:var(--radius);border:1px solid var(--border);object-fit:contain;background:repeating-conic-gradient(#ebebeb 0% 25%,#f5f5f5 0% 50%) 0/16px 16px}.empty-preview{display:grid;place-items:center;color:var(--ink-3);font-size:11px;font-style:italic}.image-preview dl{display:grid;grid-template-columns:1fr 1fr;gap:6px;margin:0}.image-preview div{padding:5px 8px;border-radius:var(--radius);background:var(--surface-raised);border:1px solid var(--border)}.image-preview dt,.image-preview dd{margin:0}.image-preview dt{font-size:10px;color:var(--ink-3)}.image-preview dd{font-size:11px;font-weight:600;color:var(--ink);margin-top:1px}.control-grid{display:flex;flex-direction:column}.number-field{display:flex;flex-direction:column;gap:5px;padding:7px 0;border-bottom:1px solid var(--border)}.number-field:last-child{border-bottom:none}.number-field-head{display:flex;justify-content:space-between;align-items:center}.number-field span{font-size:12px;color:var(--ink-2)}.number-field input[type=number]{width:62px;height:26px;padding:0 6px;border:1px solid var(--border);border-radius:4px;background:var(--surface);color:var(--ink);font-size:12px;text-align:right;transition:border-color .12s}.number-field input[type=number]:focus{border-color:var(--accent);outline:none}.range-control{--progress: 50%;height:14px;padding:0;border:0;background:transparent;cursor:pointer;appearance:none;-webkit-appearance:none;width:100%}.range-control::-webkit-slider-runnable-track{height:4px;border-radius:9px;background:linear-gradient(90deg,var(--accent) 0 var(--progress),var(--border) var(--progress) 100%)}.range-control::-webkit-slider-thumb{width:14px;height:14px;margin-top:-5px;border:2px solid white;border-radius:50%;background:var(--accent);box-shadow:0 1px 3px 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var(--border)}.sheet-metrics{margin-left:auto;font-size:12px;color:var(--ink-3);white-space:nowrap}.model-stats{display:flex;gap:10px;font-size:12px;color:var(--ink-2)}.segmented-control{display:inline-flex;gap:2px;padding:2px;border:1px solid var(--border);border-radius:var(--radius);background:var(--bg)}.segmented-control button{display:flex;align-items:center;gap:5px;padding:0 10px;height:26px;border-radius:4px;background:transparent;color:var(--ink-3);font-size:12px;font-weight:500;transition:background .12s,color .12s}.segmented-control button:hover{color:var(--ink)}.segmented-control button.active{background:var(--surface);color:var(--ink);font-weight:600;box-shadow:0 1px 2px #00000012}.active-color{display:flex;align-items:center;gap:6px}.color-picker{position:relative;display:flex;align-items:center;gap:6px;padding:3px 8px 3px 4px;border:1px solid var(--border);border-radius:999px;background:var(--surface);cursor:pointer;transition:border-color 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#0003,inset 0 1px 2px #ffffff40;transition:transform .1s ease,filter .1s ease;position:relative}.pixel-cell:hover{transform:scale(.88);filter:brightness(1.12);z-index:1}.pixel-cell:active{transform:scale(.82)}.pattern-sheet-cell,.peg-board-sheet-cell{border-radius:0;box-shadow:inset 0 0 0 1px #0000001a}.pattern-sheet-cell:hover,.peg-board-sheet-cell:hover{transform:scale(1)}.pattern-sheet-cell:after,.peg-board-sheet-cell:after{content:none}.right-panel{display:flex;flex-direction:column;gap:14px}.tool-panel-content{display:flex;flex-direction:column;gap:10px}.summary-grid{display:grid;grid-template-columns:1fr 1fr;gap:6px}.summary-grid div{padding:7px 8px;border:1px solid var(--border);border-radius:var(--radius);background:var(--surface-raised)}.summary-grid span{display:block;font-size:10px;color:var(--ink-3)}.summary-grid 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40px;--pixel-cell-size: 32px;width:calc(100vw - 16px);padding-bottom:16px}.topbar{height:auto;flex-wrap:wrap;padding:10px 12px;gap:8px}.brand-block,.topbar-actions{width:100%}.brand-block h1{white-space:normal;line-height:1.35}.topbar-actions{display:grid;grid-template-columns:1fr 1fr}.workspace,.right-panel{grid-template-columns:1fr;height:auto}.panel{height:auto;max-height:none}.editor-area{height:72svh;min-height:420px}.upload-zone{min-height:96px}.toolbar{gap:8px;padding:8px 10px}.sheet-metrics{width:100%;margin-left:0}.segmented-control{width:100%}.segmented-control button{flex:1;justify-content:center;min-height:36px}.color-picker{min-height:36px;border-radius:var(--radius)}.number-field{padding:9px 0}.number-field input[type=number]{height:34px;width:72px}.range-control{height:28px}.range-control::-webkit-slider-thumb{width:20px;height:20px;margin-top:-8px}.range-control::-moz-range-thumb{width:18px;height:18px}.pixel-grid{margin:12px}.three-preview{min-height:280px}.palette-chip-list{grid-template-columns:repeat(7,1fr);max-height:260px}.tool-switcher-header{width:100%}.tool-switcher-header button{flex:1;justify-content:center;height:36px}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{transition-duration:.01ms!important;animation-duration:.01ms!important}}