:root {
  --bg: #f4f5f7; --fg: #1d2129; --muted: #6b7280; --panel: #ffffff; --line: #d7dbe2; --accent: #2f6fde; --warn: #b45309;
  --arena: #1b2230; --grid: #263042;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #11151c; --fg: #e6e9ef; --muted: #9aa3b2; --panel: #1a2029; --line: #2c3442; --accent: #6b9cff; --warn: #f59e0b; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 15px/1.5 system-ui, -apple-system, "Segoe UI", "Hiragino Sans", "Noto Sans JP", sans-serif; }
main { max-width: 1000px; margin: 0 auto; padding: 12px 16px 32px; }
header { display: flex; align-items: baseline; gap: 12px; }
h1 { font-size: 20px; margin: 4px 0 12px; }
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 12px; margin-bottom: 12px; }
.row { display: flex; flex-wrap: wrap; gap: 8px 12px; align-items: center; margin: 4px 0; }
input, select, button { font: inherit; padding: 6px 10px; border-radius: 6px; border: 1px solid var(--line); background: var(--bg); color: var(--fg); }
button { background: var(--accent); color: #fff; border-color: transparent; cursor: pointer; }
button.small { padding: 4px 8px; font-size: 13px; background: transparent; color: var(--fg); border-color: var(--line); }
button:disabled { opacity: .5; cursor: default; }
.muted { color: var(--muted); font-size: 13px; }
.msg { color: var(--warn); min-height: 1.5em; margin: 4px 0 0; }
#stage { position: relative; }
canvas { width: 100%; height: auto; display: block; background: var(--arena); border-radius: 8px; touch-action: none; }
.hud { font: 12px/1.4 ui-monospace, Consolas, monospace; color: var(--muted); margin-top: 6px; white-space: pre-wrap; }
.keys { margin-top: 4px; }
.chip { display: inline-block; padding: 1px 8px; border-radius: 10px; border: 1px solid var(--line); margin-right: 4px; font-size: 13px; }