:root{--bg: #f6f7f9;--panel: #ffffff;--text: #16181d;--muted: #6b7280;--line: #e5e7eb;--accent: #2f81f7;--shadow: 0 1px 2px rgba(0,0,0,.04), 0 8px 24px rgba(0,0,0,.06);--radius: 14px}@media (prefers-color-scheme: dark){:root{--bg: #0e1014;--panel: #171a21;--text: #e8eaee;--muted: #9aa3af;--line: #262b34;--shadow: 0 1px 2px rgba(0,0,0,.3), 0 10px 30px rgba(0,0,0,.35)}}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:var(--bg);color:var(--text);font:14px/1.5 -apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Noto Sans SC,sans-serif;-webkit-font-smoothing:antialiased}.app{height:100%;display:flex;flex-direction:column}header{display:flex;align-items:center;justify-content:space-between;padding:12px 18px;border-bottom:1px solid var(--line);background:var(--panel)}.brand{display:flex;align-items:center;gap:10px}.logo{font-size:22px;color:var(--accent)}h1{font-size:15px;margin:0;letter-spacing:.3px}.brand p{margin:0;font-size:12px;color:var(--muted)}.actions{display:flex;gap:8px}button{font:inherit;padding:8px 14px;border-radius:10px;cursor:pointer;border:1px solid transparent;background:var(--accent);color:#fff;transition:transform .06s ease,opacity .15s ease}button:active{transform:translateY(1px)}button:disabled{opacity:.4;cursor:not-allowed}button.ghost{background:transparent;color:var(--text);border-color:var(--line)}main{flex:1;display:grid;grid-template-columns:240px 1fr 260px;min-height:0}.panel{padding:16px;background:var(--panel);border-right:1px solid var(--line);display:flex;flex-direction:column;gap:10px;overflow-y:auto}.panel.stats{border-right:0;border-left:1px solid var(--line)}.row{display:flex;justify-content:space-between;align-items:baseline;font-size:13px;color:var(--muted)}.row b{color:var(--text);font-weight:600}input[type=range]{width:100%;accent-color:var(--accent)}.switch{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--muted);cursor:pointer}.switch input{accent-color:var(--accent)}.hint{font-size:12px;color:var(--muted);margin-top:auto}.stage{overflow:auto;display:flex;align-items:center;justify-content:center;padding:24px;background-image:radial-gradient(var(--line) 1px,transparent 1px);background-size:16px 16px}canvas{box-shadow:var(--shadow);border-radius:6px;image-rendering:pixelated;cursor:crosshair}.empty{text-align:center;color:var(--muted)}.empty .big{font-size:20px;color:var(--text);margin-bottom:8px}.empty .sub{font-size:13px}.colors{display:flex;flex-direction:column;gap:2px;margin-top:6px;overflow-y:auto}.color{display:grid;grid-template-columns:16px 42px 1fr auto;align-items:center;gap:8px;padding:4px 6px;border-radius:8px}.color:hover{background:#7f7f7f14}.color i{width:16px;height:16px;border-radius:4px;border:1px solid var(--line)}.color .code{font:12px ui-monospace,monospace;color:var(--muted)}.color .name{font-size:12px}.color .n{font-size:12px;font-variant-numeric:tabular-nums;color:var(--muted)}.footnote{margin-top:auto;font-size:12px;color:var(--muted);border-top:1px solid var(--line);padding-top:10px}@media (max-width: 900px){main{grid-template-columns:1fr;grid-template-rows:auto 1fr auto}.panel{flex-direction:row;flex-wrap:wrap;align-items:center;border:0;border-bottom:1px solid var(--line)}.panel.stats{border:0;border-top:1px solid var(--line);max-height:30vh}.colors{flex-direction:row;flex-wrap:wrap}}.board-section{display:flex;flex-direction:column;gap:8px;padding-top:12px;border-top:1px solid var(--line)}.board-section h2{margin:0;font-size:13px;letter-spacing:.3px}.board-section .row b{text-align:right;font-variant-numeric:tabular-nums}.board-section select{padding:4px 6px;border-radius:8px;border:1px solid var(--line);background:var(--bg);color:var(--text);font:12px ui-monospace,SFMono-Regular,Consolas,monospace}button.wide{width:100%}.mode-switch{display:inline-flex;gap:2px;padding:2px;flex:none;background:var(--bg);border:1px solid var(--line);border-radius:999px}.mode-switch button{padding:5px 14px;border:0;border-radius:999px;background:transparent;color:var(--muted);font-size:12px;line-height:1.2}.mode-switch button.active{background:var(--accent);color:#fff}.mode-switch button:active{transform:none}.actions button{white-space:nowrap}.toast{position:fixed;top:76px;left:50%;transform:translate(-50%);z-index:50;max-width:calc(100vw - 32px);padding:9px 16px;border-radius:10px;background:#111827f0;color:#fff;font-size:13px;text-align:center;box-shadow:0 8px 24px #00000040;pointer-events:none}