:root {
  --bg: #0d1117;
  --panel: #161b22;
  --text: #e6edf3;
  --muted: #8b949e;
  --accent: #58a6ff;
  --border: #30363d;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Hiragino Sans", "Noto Sans JP", sans-serif;
}

.layout {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  justify-content: center;
  align-items: flex-start;
  padding: 16px;
}

.stage {
  position: relative;
  width: min(480px, 100%, calc((100vh - 32px) * 0.75));
  aspect-ratio: 3 / 4;
}

canvas {
  display: block;
  width: 100%;
  height: 100%;
  background: #05070a;
  border: 1px solid var(--border);
  border-radius: 8px;
  touch-action: none;
  cursor: none;
}

.score-form {
  position: absolute;
  left: 50%;
  bottom: 12%;
  transform: translateX(-50%);
  width: min(320px, 90%);
  padding: 16px;
  background: rgba(22, 27, 34, 0.95);
  border: 1px solid var(--border);
  border-radius: 8px;
  display: grid;
  gap: 10px;
}
.score-form[hidden] { display: none; }
.score-form__title { margin: 0; font-weight: bold; text-align: center; }
.score-form label { display: grid; gap: 4px; font-size: 14px; color: var(--muted); }
.score-form input {
  padding: 8px;
  font-size: 16px;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
}
.score-form__actions { display: flex; gap: 8px; }
.score-form button {
  flex: 1;
  padding: 8px;
  font-size: 14px;
  border: 0;
  border-radius: 4px;
  background: var(--accent);
  color: #0d1117;
  font-weight: bold;
  cursor: pointer;
}
.score-form button.secondary { background: var(--border); color: var(--text); }
.score-form button:disabled { opacity: 0.5; cursor: default; }
.status { margin: 0; min-height: 1.2em; font-size: 13px; color: var(--muted); text-align: center; }

.side {
  width: min(280px, 100%);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
}
.side h1 { margin: 0 0 12px; font-size: 22px; }
.side h2 { font-size: 15px; margin: 16px 0 8px; color: var(--muted); }
.side h2 small { font-weight: normal; font-size: 12px; }

.help { margin: 0; padding-left: 18px; font-size: 13px; line-height: 1.9; }
kbd {
  display: inline-block;
  padding: 0 5px;
  margin-right: 2px;
  border: 1px solid var(--border);
  border-radius: 3px;
  font-size: 12px;
  background: var(--bg);
}

.ranking { margin: 0; padding-left: 24px; font-size: 14px; line-height: 1.8; }
.ranking li { font-variant-numeric: tabular-nums; }
.ranking .score { float: right; color: var(--accent); }
.ranking .empty { list-style: none; margin-left: -24px; color: var(--muted); }
.ranking .me { color: #f0c000; }

.back { margin: 16px 0 0; font-size: 13px; }
.back a { color: var(--accent); }