*{margin:0;padding:0;box-sizing:border-box}:root{--bg: #f8fafc;--surface: #ffffff;--surface2: #f1f5f9;--accent: #4f46e5;--accent-hover: #4338ca;--accent-light: #eef2ff;--text: #0f172a;--text2: #475569;--text-dim: #94a3b8;--border: #e2e8f0;--border-light: #f1f5f9;--success: #16a34a;font-family:system-ui,-apple-system,sans-serif;color:var(--text)}body{background:var(--bg);height:100vh;overflow:hidden}#app{display:flex;flex-direction:column;height:100vh}#toolbar{display:flex;align-items:center;gap:8px;padding:6px 12px;background:var(--surface);border-bottom:1px solid var(--border);flex-shrink:0;flex-wrap:wrap;box-shadow:0 1px 2px #0000000a}.toolbar-group{display:flex;gap:4px}.toolbar-group+.toolbar-group{border-left:1px solid var(--border);padding-left:8px}.spacer{flex:1}#status{color:var(--text-dim);font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.ico{width:14px;height:14px;display:inline-block;vertical-align:-2px;flex-shrink:0}.ico-lg{width:18px;height:18px;vertical-align:-3px}summary .ico{width:14px;height:14px;vertical-align:-2px;margin-right:2px;opacity:.6}button{background:var(--surface2);border:1px solid var(--border);color:var(--text2);padding:4px 10px;border-radius:6px;cursor:pointer;font-size:13px;white-space:nowrap;transition:all .15s ease;display:inline-flex;align-items:center;gap:4px}button:hover:not(:disabled){background:var(--accent);border-color:var(--accent);color:#fff}button:disabled{opacity:.35;cursor:default}button.mode-active{background:var(--accent);border-color:var(--accent);color:#fff;box-shadow:0 1px 3px #4f46e54d}button.btn-text{background:transparent;border:none;font-size:16px;color:var(--text-dim)}button.btn-text:hover:not(:disabled){background:transparent;color:var(--accent)}#main{display:flex;flex:1;overflow:hidden}#sidebar{width:260px;min-width:260px;background:var(--surface);border-right:1px solid var(--border);overflow-y:auto;flex-shrink:0}#sidebar::-webkit-scrollbar{width:6px}#sidebar::-webkit-scrollbar-track{background:transparent}#sidebar::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}#sidebar::-webkit-scrollbar-thumb:hover{background:var(--text-dim)}details{border-bottom:1px solid var(--border)}summary{padding:10px 12px;cursor:pointer;font-size:13px;font-weight:600;user-select:none;color:var(--text);transition:background .1s}summary:hover{background:var(--surface2)}summary::marker{color:var(--text-dim)}.panel{padding:6px 12px 14px;display:flex;flex-direction:column;gap:8px}.panel label{display:flex;flex-direction:column;gap:2px;font-size:12px;color:var(--text2)}.panel label span{float:right;color:var(--text);font-variant-numeric:tabular-nums;font-weight:500}.panel select,.panel input[type=range]{width:100%}.panel select{background:var(--surface2);color:var(--text);border:1px solid var(--border);padding:4px 8px;border-radius:6px;font-size:12px;transition:border-color .15s}.panel select:hover{border-color:var(--accent)}.panel select:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 2px var(--accent-light)}input[type=range]{accent-color:var(--accent);height:18px}input[type=checkbox]{accent-color:var(--accent)}#page-info{font-size:12px;color:var(--text-dim);padding:4px 0;line-height:1.5}#canvas-container{flex:1;overflow:hidden;position:relative;cursor:crosshair;background:repeating-conic-gradient(#f1f5f9 0% 25%,#f8fafc 0% 50%) 0 0 / 20px 20px}#canvas{position:absolute;top:0;left:0}.small-btn{font-size:11px;padding:3px 8px}.num-input{background:var(--surface2);color:var(--text);border:1px solid var(--border);padding:4px 8px;border-radius:6px;font-size:12px;width:100%;transition:border-color .15s}.num-input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 2px var(--accent-light)}.panel-hint{font-size:11px;color:var(--text-dim);font-style:italic;line-height:1.4}.panel-divider{border-top:1px solid var(--border);margin:4px 0}#cal-info{font-size:12px;padding:4px 0;color:var(--text-dim)}#cal-info.calibrated{color:var(--success);font-weight:600}#sel-info{font-size:12px;color:var(--text-dim)}.color-swatch-row{display:flex;align-items:center;gap:8px;font-size:12px;color:var(--text-dim)}.color-swatch{display:inline-block;width:20px;height:20px;border:1px solid var(--border);border-radius:4px;box-shadow:0 0 0 1px #0000000d}.mono{font-family:ui-monospace,monospace;font-size:11px;color:var(--text2)}#canvas-container.dragover:after{content:"Drop image here";position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:#4f46e514;border:3px dashed var(--accent);border-radius:8px;font-size:24px;font-weight:600;color:var(--accent);pointer-events:none}dialog{background:var(--surface);color:var(--text);border:1px solid var(--border);border-radius:12px;padding:24px;max-width:440px;width:90vw;box-shadow:0 8px 30px #0000001f}dialog::backdrop{background:#0f172a66;backdrop-filter:blur(4px)}dialog h2{margin-bottom:12px;font-size:20px;color:var(--text)}dialog h3{margin-bottom:8px;font-size:16px;color:var(--text)}dialog p{font-size:14px;line-height:1.5;margin-bottom:8px;color:var(--text2)}dialog p.about-tech{font-size:12px;color:var(--text-dim)}dialog p.about-version{font-size:11px;color:var(--text-dim);margin-top:12px}dialog a{color:var(--accent);text-decoration:none}dialog a:hover{text-decoration:underline}dialog button{margin-top:12px}.sample-grid{display:flex;flex-direction:column;gap:10px;margin:12px 0}.sample-card{display:flex;flex-direction:column;align-items:flex-start;gap:4px;padding:10px;background:var(--surface2);border:1px solid var(--border);border-radius:8px;cursor:pointer;text-align:left;transition:all .15s ease}.sample-card:hover{border-color:var(--accent);background:var(--accent-light);box-shadow:0 2px 8px #4f46e51a}.sample-card img{width:100%;max-height:120px;object-fit:cover;border-radius:6px}.sample-card span{font-size:14px;font-weight:600;color:var(--text)}.sample-card small{font-size:11px;color:var(--text-dim)}@media(min-width:800px){#toolbar{flex-wrap:nowrap}}