:root {
  --bg: #0f1218;
  --panel: #171c26;
  --border: #2a3142;
  --text: #e6e9f0;
  --muted: #98a2b8;
  --accent: #7aa2ff;
  --ok: #4ade80;
  --fail: #f87171;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", "Yu Gothic UI", "Hiragino Sans", "Noto Sans JP", sans-serif;
  font-size: 14px;
  line-height: 1.5;
}
header { padding: 16px 24px 4px; }
header h1 { margin: 0; font-size: 20px; }
header .sub { margin: 4px 0 0; color: var(--muted); }
.nav { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.nav a {
  color: var(--accent); text-decoration: none; font-size: 13px;
  padding: 5px 12px; border: 1px solid var(--border); border-radius: 6px; background: #171c26;
}
.nav a:hover { background: #232a3a; }
.nav a.active { background: #2f55c9; color: #fff; border-color: #3b64e6; }

main {
  display: flex;
  gap: 16px;
  padding: 12px 24px;
  align-items: flex-start;
  flex-wrap: wrap;
}
.arena-wrap { flex: 0 0 auto; }
canvas#arena {
  display: block;
  width: 720px;
  height: 720px;
  max-width: 100%;
  aspect-ratio: 1 / 1;
  background: #0a0d13;
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: crosshair;
  touch-action: none;
  -webkit-user-select: none;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}
.controls-hint { color: var(--muted); font-size: 12px; margin-top: 6px; }
.touch-bar { display: none; margin-top: 8px; }
.touch-bar .sprint {
  width: 100%; padding: 14px; font-size: 16px; touch-action: none;
  -webkit-user-select: none; user-select: none;
}
.touch-bar .sprint.on { background: #2f55c9; border-color: #3b64e6; }
@media (hover: none) and (pointer: coarse) {
  .touch-bar { display: block; }
}

.panel {
  flex: 1 1 340px;
  min-width: 320px;
  max-width: 520px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
}
.panel h2 { font-size: 15px; margin: 10px 0 8px; color: var(--accent); }
.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px 12px; }
.grid label { display: flex; flex-direction: column; gap: 3px; font-size: 13px; color: var(--muted); }
.grid label.check { flex-direction: row; align-items: center; gap: 6px; color: var(--text); grid-column: span 2; }
select, input[type=range] { width: 100%; }
select {
  background: #0f1218; color: var(--text); border: 1px solid var(--border);
  border-radius: 4px; padding: 4px 6px; font-size: 13px;
}
.buttons { display: flex; gap: 8px; margin: 12px 0 4px; }
button {
  background: #232a3a; color: var(--text); border: 1px solid var(--border);
  border-radius: 6px; padding: 7px 14px; font-size: 14px; cursor: pointer;
}
button:hover { background: #2c3449; }
button.primary { background: #2f55c9; border-color: #3b64e6; }
button.primary:hover { background: #3a63dd; }

.status div { display: flex; gap: 10px; padding: 2px 0; }
.status .k { flex: 0 0 96px; color: var(--muted); }
.status .hint span:last-child { color: #ffe08a; }

.result { margin-top: 10px; padding: 10px 12px; border-radius: 6px; border: 1px solid; }
.result.ok { border-color: var(--ok); background: rgba(74, 222, 128, 0.08); }
.result.fail { border-color: var(--fail); background: rgba(248, 113, 113, 0.08); }
.result h3 { margin: 0 0 6px; font-size: 15px; }
.result ul { margin: 0; padding-left: 18px; }
.hidden { display: none; }

.log {
  list-style: none; margin: 0; padding: 0;
  max-height: 260px; overflow-y: auto;
  border: 1px solid var(--border); border-radius: 6px;
  background: #0f1218; font-size: 12.5px;
}
.log li { padding: 3px 8px; border-bottom: 1px solid #1d2331; }
.log li .t { color: var(--muted); display: inline-block; width: 46px; }
.log li.ok { color: var(--ok); }
.log li.fail { color: var(--fail); }
.log li.info { color: var(--text); }

.doc { padding: 8px 24px 32px; max-width: 1280px; }
.doc h2 { font-size: 15px; color: var(--accent); margin: 14px 0 6px; }
.doc ol, .doc ul { margin: 0; padding-left: 22px; }
.doc li { margin: 3px 0; }
.doc .note { color: var(--muted); font-size: 12.5px; }
/* スマホ・タブレット */
@media (max-width: 900px) {
  header { padding: 12px 12px 2px; }
  header h1 { font-size: 16px; }
  header .sub { font-size: 12px; }
  main { flex-direction: column; padding: 8px 12px; gap: 12px; }
  .arena-wrap { width: 100%; }
  canvas#arena { width: 100%; height: auto; }
  .panel { max-width: none; min-width: 0; width: 100%; padding: 12px; }
  .grid { grid-template-columns: 1fr 1fr; }
  select { font-size: 16px; padding: 8px 6px; } /* iOS の自動ズーム防止 */
  button { padding: 12px 14px; font-size: 15px; }
  .buttons { flex-wrap: wrap; }
  .buttons button { flex: 1 1 30%; }
  .status .k { flex-basis: 84px; }
  .log { max-height: 180px; }
  .doc { padding: 8px 12px 28px; }
  .doc .macro { font-size: 11.5px; }
}
@media (max-width: 420px) {
  .grid { grid-template-columns: 1fr; }
  .grid label.check { grid-column: span 1; }
}
.doc .macro {
  background: #0f1218; border: 1px solid var(--border); border-radius: 6px;
  padding: 10px 14px; margin: 6px 0 10px; font-size: 13px; line-height: 1.45;
  font-family: Consolas, "MS Gothic", monospace; white-space: pre; overflow-x: auto;
}