:root { color-scheme: light; --ink: #2f2525; --paper: #fdf6d8; --accent: #fed23f; --muted: #6b6b6b; }
* { box-sizing: border-box; }
html, body { height: 100%; }
body { margin: 0; font: 14px/1.4 Quicksand, system-ui, sans-serif; color: var(--ink); background: var(--paper);
  background-image: radial-gradient(circle at 1.5px 1.5px, #f3e7ad 1.5px, transparent 0); background-size: 12px 12px;
  display: flex; flex-direction: column; min-height: 100vh; }
header { display: flex; justify-content: space-between; align-items: center; padding: 14px 20px; border-bottom: 2px solid var(--ink); background: var(--paper); }
h1 { margin: 0; font-size: 22px; font-weight: 700; }
.meta { color: var(--muted); font-size: 13px; }
main { flex: 1; display: grid; grid-template-columns: 1fr 300px; gap: 16px; padding: 16px 20px; min-height: 0; }
@media (max-width: 800px) { main { grid-template-columns: 1fr; } }
.stage { position: relative; display: flex; align-items: flex-start; justify-content: center; min-width: 0; }
.board { position: relative; pointer-events: none; }
.board * { pointer-events: none !important; transition: none !important; animation: none !important; }
.board [data-puzzle-grid] { box-shadow: 6px 6px 0 0 var(--gray-300, #bdbdbd), 6px 6px 0 6px var(--black, #2f2525); }
.flash { position: absolute; border: 3px solid #e5484d; border-radius: 6px; pointer-events: none; opacity: 0; transition: opacity .6s ease-out; }
.flash.on { opacity: 1; transition: none; }
.drop { border: 2px dashed var(--ink); border-radius: 12px; padding: 40px; text-align: center; max-width: 480px; background: rgba(255,255,255,.6); }
.drop.over { background: #fff; }
.moves { background: #fff; border: 2px solid var(--ink); border-radius: 10px; padding: 10px 12px; display: flex; flex-direction: column; min-height: 0; max-height: calc(100vh - 170px); }
.moves h2 { font-size: 15px; margin: 0 0 8px; }
.moves h2 span { color: var(--muted); font-weight: 500; }
.moves ol { list-style: none; margin: 0; padding: 0; overflow: auto; flex: 1; }
.moves li { display: grid; grid-template-columns: 48px 1fr; gap: 8px; padding: 4px 6px; border-radius: 6px; cursor: pointer; font-size: 13px; }
.moves li:hover { background: #fdf6d8; }
.moves li.current { background: var(--accent); }
.moves li.done { color: var(--ink); }
.moves li.future { color: var(--muted); }
.moves li .t { font-variant-numeric: tabular-nums; color: var(--muted); }
.moves li.ui .what { font-style: italic; }
.controls { display: flex; gap: 10px; align-items: center; padding: 12px 20px; border-top: 2px solid var(--ink); background: var(--paper); flex-wrap: wrap; }
.controls button, header button { font: inherit; font-weight: 700; border: 2px solid var(--ink); border-radius: 8px; padding: 6px 10px; background: var(--accent); cursor: pointer; box-shadow: 2px 2px 0 0 var(--ink); }
.controls button:active, header button:active { transform: translate(2px, 2px); box-shadow: none; }
button.quiet { background: #fff; }
.controls input[type=range] { flex: 1; min-width: 160px; accent-color: var(--ink); }
.time { font-variant-numeric: tabular-nums; }
.controls label { display: flex; gap: 6px; align-items: center; }
select { font: inherit; }
header .right { display: flex; gap: 8px; }
.hint { color: var(--muted); font-size: 12px; margin-left: auto; }
.toast { position: fixed; left: 50%; bottom: 80px; transform: translateX(-50%); background: var(--ink); color: #fff; padding: 8px 14px; border-radius: 8px; font-weight: 600; }