:root {
  --bg: #f5f6f8; --fg: #1d2330; --card: #fff; --line: #c5cad6; --thick: #1d2330;
  --accent: #3b6fe0; --sel: #ffe27a; --target: #cfe0ff; --match: #d8f2dc; --muted: #6b7385;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14171f; --fg: #e8ebf3; --card: #1e232f; --line: #3a4152; --thick: #aab3c8;
    --accent: #6c97ff; --sel: #7a6414; --target: #26385f; --match: #1f4a2c; --muted: #98a1b5;
  }
}
* { box-sizing: border-box; }
body { margin: 0; padding: 16px; background: var(--bg); color: var(--fg);
       font: 16px/1.4 system-ui, sans-serif; }
h1 { display: flex; align-items: center; gap: 10px; margin: 0 0 4px; font-size: 1.5rem; }
p.sub { margin: 0 0 8px; font-size: .9rem; color: var(--muted); }
.board { display: grid; grid-template-columns: repeat(9, 1fr); width: min(92vw, 420px);
         aspect-ratio: 1; background: var(--card); border: 2px solid var(--thick); }
.cell { display: flex; align-items: center; justify-content: center; font-size: clamp(14px, 4.6vw, 24px);
        border: 1px solid var(--line); user-select: none; }
.board .cell { cursor: pointer; position: relative; }
.pm { position: absolute; right: 2px; bottom: 0; font-size: clamp(8px, 2.3vw, 11px); line-height: 1.1; color: var(--muted); }
.cell.match .pm { display: none; }
.cell.br { border-right: 2px solid var(--thick); }
.cell.bb { border-bottom: 2px solid var(--thick); }
.cell.lr { border-right-width: 0; }
.cell.match { background: var(--match); }
.cell.hl { background: var(--target); }
.cell.sel { background: var(--sel); }
.frame { display: grid; grid-template-columns: 22px 1fr 22px; grid-template-rows: 22px auto 22px;
         width: min(94vw, 464px); gap: 2px; margin: 0 auto; }
.frame .board { width: 100%; grid-area: 2 / 2; }
.strip { display: grid; touch-action: none; }
.strip.top { grid-area: 1 / 2; grid-template-columns: repeat(9, 1fr); }
.strip.left { grid-area: 2 / 1; grid-template-rows: repeat(9, 1fr); }
.strip.bottom { grid-area: 3 / 2; grid-template-columns: repeat(3, 1fr); }
.strip.right { grid-area: 2 / 3; grid-template-rows: repeat(3, 1fr); }
.handle { margin: 1px; border-radius: 5px; background: var(--line); color: var(--muted); cursor: grab;
          display: flex; align-items: center; justify-content: center; font-size: 11px;
          user-select: none; touch-action: none; transition: background .1s; }
.handle.big { background: color-mix(in srgb, var(--accent) 35%, var(--card)); color: var(--fg); }
.handle:hover { background: var(--accent); color: #fff; }
.handle.dragging { background: var(--sel); color: var(--fg); cursor: grabbing; }
.handle.disabled { opacity: .25; cursor: not-allowed; pointer-events: none; }
#cur .cell { touch-action: none; }
.handle.over { background: var(--accent); color: #fff; }
body.dragging, body.dragging * { cursor: grabbing !important; }
.controls { max-width: 760px; margin: 20px auto 0; display: grid; gap: 12px; }
.row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; justify-content: center; }
.row > label { color: var(--muted); font-size: .9rem; }
button, select { font: inherit; padding: 6px 12px; border-radius: 8px; border: 1px solid var(--line);
                 background: var(--card); color: var(--fg); cursor: pointer; }
button:hover { border-color: var(--accent); }
button:disabled { opacity: .5; cursor: default; }
.status { text-align: center; min-height: 1.5em; font-weight: 600; }
.status.win { color: #2a9d4b; }
.hint { text-align: center; color: var(--muted); font-size: .9rem; min-height: 1.3em; }
button.icon { width: 40px; height: 36px; padding: 0; display: inline-flex; align-items: center; justify-content: center; }
button.icon svg { display: block; }