:root{--bg: #101114;--panel: #17191f;--panel2: #20232b;--text: #f2f4f8;--muted: #aab2c0;--border: #30343f;--accent: #7aa2ff}*{box-sizing:border-box}body{margin:0;font-family:ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:var(--bg);color:var(--text)}header{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px 18px;border-bottom:1px solid var(--border);background:#0d0e12}h1{margin:0;font-size:19px;line-height:1.2}header p{margin:4px 0 0;color:var(--muted);font-size:13px}.credit{font-size:12px}.credit a{color:#dce5ff;text-decoration-color:#7aa2ff8c;text-underline-offset:3px}.credit a:hover{color:var(--text)}.header-actions{display:flex;gap:8px;flex-wrap:wrap;justify-content:flex-end}button{border:1px solid var(--border);border-radius:8px;background:var(--panel2);color:var(--text);padding:9px 12px;cursor:pointer}button:hover{border-color:var(--accent)}button.active,button[aria-pressed=true]{border-color:var(--accent);background:#24304a}main{display:grid;grid-template-columns:340px 1fr;min-height:calc(100vh - 69px)}aside{overflow-y:auto;max-height:calc(100vh - 69px);border-right:1px solid var(--border);background:var(--panel);padding:14px}section{border:1px solid var(--border);border-radius:12px;background:#ffffff05;padding:12px;margin-bottom:12px}h2{margin:0 0 10px;font-size:14px;color:#dce5ff}label{display:grid;grid-template-columns:1fr 132px;gap:10px;align-items:center;margin:8px 0;color:var(--muted);font-size:13px}input,select{width:100%;border:1px solid var(--border);border-radius:7px;background:#0f1116;color:var(--text);padding:7px 8px}select{grid-column:1 / -1}input[type=color]{min-height:36px;padding:3px;cursor:pointer}.color-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px}.color-grid label{grid-template-columns:1fr 52px;margin:0}.hint{margin:10px 0 0;color:var(--muted);font-size:12px;line-height:1.35}.canvas-panel{display:grid;grid-template-rows:1fr auto auto;gap:10px;margin:0;border:none;border-radius:0;background:radial-gradient(circle at center,#181b22,#090a0d);padding:16px;min-width:0}.stage-grid{align-self:center;justify-self:center;display:grid;grid-template-columns:minmax(260px,1fr);gap:14px;width:min(100%,900px);min-height:0}body.trace-mode .stage-grid{grid-template-columns:minmax(260px,1fr) minmax(280px,.74fr);width:min(100%,1280px)}#basinCanvas{align-self:center;justify-self:center;max-width:100%;max-height:calc(100vh - 140px);width:min(82vh,100%);height:auto;image-rendering:pixelated;border:1px solid var(--border);border-radius:12px;background:#000;cursor:grab}body.trace-mode #basinCanvas{width:min(76vh,100%)}#basinCanvas.dragging{cursor:grabbing}#basinCanvas.selecting,#basinCanvas.tracing{cursor:crosshair}.trace-panel{display:none;align-self:center;grid-template-rows:minmax(0,1fr) auto;gap:10px;margin:0;min-width:0;min-height:0}body.trace-mode .trace-panel{display:grid}.trace-viewport{aspect-ratio:1 / 1;min-height:0;max-height:calc(100vh - 170px);border:1px solid var(--border);border-radius:12px;overflow:hidden;background:#090a0d}.trace-viewport canvas{display:block;width:100%;height:100%}.trace-meta{display:grid;grid-template-columns:1fr 1fr;gap:8px}.trace-meta div{border:1px solid var(--border);border-radius:8px;background:#ffffff08;padding:9px;min-width:0}.trace-meta span,.trace-meta strong{display:block;overflow-wrap:anywhere}.trace-meta span{color:var(--muted);font-size:11px}.trace-meta strong{margin-top:3px;font-size:12px;font-weight:650}.equation-dialog{width:min(680px,calc(100vw - 28px));border:1px solid var(--border);border-radius:12px;background:var(--panel);color:var(--text);padding:18px}.equation-dialog::backdrop{background:#0000009e}.equation-dialog p{color:var(--muted);line-height:1.45}.dialog-close{position:absolute;top:12px;right:12px;width:34px;height:34px;padding:0;font-size:22px;line-height:1}.equation-block{margin:14px 0;padding:14px;border:1px solid var(--border);border-radius:8px;background:#0f1116;color:#f8fbff;font-family:ui-serif,Georgia,serif;font-size:18px;line-height:1.55;overflow-x:auto}.term-list{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:14px 0}.term-list div{border:1px solid var(--border);border-radius:8px;background:#ffffff08;padding:10px}.term-list dt{color:#f8fbff;font-weight:700;margin-bottom:4px}.term-list dd{margin:0;color:var(--muted);font-size:13px;line-height:1.35}#status,#counts{color:var(--muted);font-size:13px;min-height:18px}#counts span{display:inline-block;margin-right:12px}@media (max-width: 900px){header{align-items:flex-start;flex-direction:column}main{grid-template-columns:1fr}aside{max-height:none;border-right:none;border-bottom:1px solid var(--border)}.stage-grid{grid-template-columns:1fr}#basinCanvas{width:100%}.trace-viewport{min-height:280px;max-height:none}.term-list{grid-template-columns:1fr}}