:root{--text:#4b4657;--text-h:#08060d;--text-m:#7a7684;--bg:#fff;--panel-bg:#eee;--input-bg:#fff;--border:#dcdae0;--accent:#aa3bff;--error-text:#b0261b;--error-border:#b0261b80;--error-bg:#b0261b14;--sans:system-ui, "Segoe UI", Roboto, sans-serif;--mono:ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;font:15px/1.4 var(--sans);--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light dark;color:var(--text);background:var(--bg);text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}@media (prefers-color-scheme:dark){:root{--lightningcss-light: ;--lightningcss-dark:initial;--text:#b7b3bd;--text-h:#f3f4f6;--text-m:#8a8792;--bg:#16171d;--panel-bg:#1c1d24;--input-bg:#1f2028;--border:#2e303a;--accent:#c084fc;--error-text:#ff8a80;--error-border:#ff8a8080;--error-bg:#ff8a8014}}body{margin:0}#root{min-height:100svh}h1,h2{color:var(--text-h);font-weight:600}p{margin:0}a{color:var(--accent)}.app{text-align:left;max-width:1200px;margin:0 auto;padding:24px 20px 48px}.app-header{text-align:left;margin-bottom:24px}.app-header h1{margin:0 0 12px;font-size:28px;line-height:1.1}.app-header p{color:var(--text-m);margin:0}.project-bar{border:1px solid var(--border);background:var(--panel-bg,transparent);border-radius:8px;flex-wrap:wrap;align-items:center;gap:12px;margin-bottom:16px;padding:10px 12px;display:flex}.project-bar-field{align-items:center;gap:6px;display:flex}.project-bar-field>span{color:var(--text-m);font-size:13px}.project-bar select,.project-bar input[type=text]{width:auto;min-width:160px}button{color:#000;font:inherit;border:1px solid var(--border);cursor:pointer;background:#ccc;border-radius:4px;padding:4px 10px}.project-bar button:disabled{opacity:.4;cursor:not-allowed}.layout{grid-template-columns:minmax(320px,420px) 1fr;align-items:start;gap:24px;display:grid}@media (width<=900px){.layout{grid-template-columns:1fr}}.controls{flex-direction:column;gap:16px;min-width:0;display:flex}fieldset{border:1px solid var(--border);border-radius:8px;margin:0;padding:12px 14px}legend{color:var(--text-h);padding:0 6px;font-weight:600}.legend-swatch{vertical-align:middle;border-radius:2px;width:10px;height:10px;margin-right:6px;display:inline-block}.help-bubble{vertical-align:middle;margin-left:6px;font-weight:400;display:inline-flex;position:relative}.help-icon{border:1px solid var(--border);width:16px;height:16px;color:#f9fafb;cursor:help;-webkit-user-select:none;user-select:none;background:#1f2937;border-radius:50%;justify-content:center;align-items:center;font-size:11px;font-weight:600;line-height:1;display:inline-flex}.help-icon:focus-visible{outline:2px solid var(--accent,#3b82f6);outline-offset:2px}.help-tooltip{visibility:hidden;opacity:0;z-index:20;color:#f9fafb;text-align:left;pointer-events:none;white-space:normal;background:#1f2937;border-radius:6px;width:max-content;max-width:280px;padding:8px 10px;font-size:12px;line-height:1.4;transition:opacity .12s;position:absolute;top:calc(100% + 6px);left:0}.help-bubble:hover .help-tooltip,.help-icon:focus-visible~.help-tooltip{visibility:visible;opacity:1}.help-tooltip code{background:#ffffff26;border-radius:3px;padding:1px 4px;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:11px}.row{flex-wrap:wrap;align-items:center;gap:10px;display:flex}.row label{align-items:center;gap:6px;display:flex}.radios{grid-template-columns:repeat(2,1fr);gap:10px 12px;max-width:300px;display:grid}.radios label{cursor:pointer;align-items:center;gap:4px;display:inline-flex}.mask-options{grid-template-columns:repeat(4,1fr);justify-items:center;gap:6px;max-width:400px;display:grid}.mask-option{cursor:pointer;border:1px solid #0000;border-radius:4px;flex-direction:column;align-items:center;gap:2px;padding:4px;display:flex}.mask-option:has(input:checked){border-color:var(--accent);background:var(--panel-bg)}.mask-option-label{align-items:center;gap:3px;font-size:13px;display:inline-flex}.mask-preview{border:1px solid var(--border);color:#000;background:#fff;display:block}input[type=range]{flex:160px;min-width:120px}input[type=number]{width:5.5em;font:inherit;border:1px solid var(--border);background:var(--input-bg,transparent);color:inherit;border-radius:4px;padding:4px 6px}input[type=text],textarea,select{box-sizing:border-box;width:100%;font:inherit;border:1px solid var(--border);background:var(--input-bg,transparent);color:inherit;border-radius:4px;padding:6px 8px}textarea{resize:vertical;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:13px}select{width:auto}.muted{color:var(--text-m);font-size:13px}.segments{flex-direction:column;gap:10px;display:flex}.segment{border:1px solid var(--border);background:var(--panel-bg,transparent);border-left-style:solid;border-left-width:4px;border-radius:6px;flex-direction:column;gap:6px;padding:8px 10px 10px;transition:box-shadow .12s;display:flex}.segment.focused{box-shadow:0 0 0 2px #3b82f640}.segment-swatch{border-radius:2px;flex-shrink:0;width:10px;height:10px;display:inline-block}.segment-head{align-items:center;gap:8px;display:flex}.segment-index{color:var(--text-m);font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}.segment-buttons{gap:4px;margin-left:auto;display:flex}.segment-buttons button,.download{font:inherit;border:1px solid var(--border);color:inherit;cursor:pointer;background:0 0;border-radius:4px;padding:4px 10px}.segment-buttons button{padding:2px 8px}.segment-buttons button:disabled{opacity:.4;cursor:not-allowed}.add-segment{align-self:flex-start}.segment-hint{font-size:12px}.segment-hex{flex-direction:column;gap:4px;margin-top:2px;display:flex}.hex-legend{flex-wrap:wrap;gap:4px 10px;font-size:12px;display:flex}.hex-legend-item{align-items:center;gap:4px;display:inline-flex}.hex-legend .swatch{border-radius:2px;width:10px;height:10px;display:inline-block}.hex-legend code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:12px}.hex-row{flex-wrap:wrap;gap:2px;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:14px;line-height:1;display:flex}.hex-nibble{text-align:center;border:1px solid var(--border);cursor:default;background-clip:padding-box;border-radius:3px;min-width:1.2em;padding:3px 4px}.hex-nibble.partial{letter-spacing:1px;color:var(--text-m);font-size:11px}.hex-nibble:hover,.hex-nibble.highlight-active{outline-offset:-1px;z-index:1;outline:2px solid #f43f5e}.output{flex-direction:column;gap:16px;min-width:0;display:flex}.canvas-wrap{border:1px solid var(--border);background:var(--panel-bg,transparent);border-radius:8px;justify-content:center;padding:12px;display:flex;position:relative;overflow:auto}.canvas-help{z-index:5;position:absolute;top:6px;right:6px}.canvas-help .help-tooltip{left:auto;right:0}.canvas-stack{line-height:0;display:inline-block;position:relative}.canvas-stack canvas{image-rendering:pixelated;image-rendering:crisp-edges;max-width:100%;height:auto;display:block}.canvas-stack .overlay-canvas{pointer-events:none;position:absolute;inset:0}.info{border:1px solid var(--border);border-radius:8px;grid-template-columns:max-content 1fr;gap:4px 16px;margin:0;padding:12px;font-size:14px;display:grid}.info dt{color:var(--text-m)}.info dd{margin:0;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}.download{align-self:flex-start;padding:8px 14px}.error{border:1px solid var(--error-border,#c33);background:var(--error-bg,#cc333314);color:var(--error-text,#c33);border-radius:8px;padding:12px 14px;font-size:14px;line-height:1.4}.error strong{margin-bottom:4px;display:block}.app-footer{border-top:1px solid var(--border);margin-top:32px;padding-top:12px;font-size:13px}.app-footer a{color:inherit}