:root {
  --bg: #11151c;
  --bg2: #1a2230;
  --panel: #1f2733;
  --ink: #e8eef6;
  --muted: #9fb0c3;
  --accent: #5ad1c9;
  --line: rgba(255, 255, 255, 0.08);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: radial-gradient(1200px 700px at 50% -10%, #213048, var(--bg)) fixed;
  color: var(--ink);
  font-family: system-ui, -apple-system, "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
  -webkit-text-size-adjust: 100%;
}

.wrap {
  max-width: 560px;
  margin: 0 auto;
  padding: 24px 18px 40px;
}

.head { text-align: center; margin-bottom: 18px; }
.head h1 { margin: 0 0 6px; font-size: 1.7rem; letter-spacing: 0.02em; }
.tagline { margin: 0; color: var(--muted); font-size: 0.92rem; }

.card {
  background: linear-gradient(180deg, var(--panel), var(--bg2));
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 22px 20px;
  box-shadow: 0 14px 40px rgba(0, 0, 0, 0.35);
}

.lead { margin: 0 0 14px; text-align: center; color: var(--muted); }

.levels { display: grid; gap: 10px; }
.levels button {
  width: 100%;
  text-align: left;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--line);
  color: var(--ink);
  border-radius: 14px;
  padding: 14px 16px;
  font-size: 1rem;
  cursor: pointer;
  transition: transform 0.12s ease, border-color 0.12s ease, background 0.12s ease;
}
.levels button:hover { transform: translateY(-2px); border-color: var(--accent); background: rgba(90, 209, 201, 0.08); }
.levels button .lv-name { font-weight: 700; }
.levels button .lv-desc { display: block; color: var(--muted); font-size: 0.82rem; margin-top: 3px; }

.best { margin: 18px 0 4px; }
.best dt { color: var(--muted); font-size: 0.82rem; margin-bottom: 6px; }
.best dd { margin: 0; font-size: 0.92rem; line-height: 1.7; }
.best .b-row { display: flex; justify-content: space-between; border-bottom: 1px dashed var(--line); padding: 2px 0; }

.rule { margin-top: 16px; color: var(--muted); }
.rule summary { cursor: pointer; }
.rule ul { margin: 10px 0 0; padding-left: 1.1em; line-height: 1.6; font-size: 0.88rem; }

/* ゲーム画面 */
.hud {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}
.stat {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 8px 14px;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 78px;
}
.stat-label { font-size: 0.7rem; color: var(--muted); }
.stat-val { font-size: 1.3rem; font-weight: 800; }
.hud .ghost { margin-left: auto; }

.status {
  text-align: center;
  font-size: 1.05rem;
  font-weight: 700;
  min-height: 1.4em;
  margin: 4px 0 14px;
  color: var(--accent);
}

.pads {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(2, 1fr);
}
.pads.cols3 { grid-template-columns: repeat(3, 1fr); }

.pad {
  aspect-ratio: 1 / 1;
  border: none;
  border-radius: 18px;
  cursor: pointer;
  opacity: 0.42;
  filter: saturate(0.85);
  transition: opacity 0.12s ease, transform 0.08s ease, box-shadow 0.12s ease;
  background: var(--c);
  box-shadow: inset 0 -6px 14px rgba(0, 0, 0, 0.28);
}
.pad:active { transform: scale(0.97); }
.pad.lit {
  opacity: 1;
  filter: saturate(1.25) brightness(1.25);
  box-shadow: 0 0 28px var(--c), inset 0 -6px 14px rgba(0, 0, 0, 0.2);
}
.pads.locked .pad { cursor: default; }

.result-title { text-align: center; margin: 0 0 8px; }
.result-score { text-align: center; font-size: 1.5rem; font-weight: 800; margin: 4px 0; }
.result-score span { color: var(--accent); }
.result-best { text-align: center; color: var(--muted); min-height: 1.4em; margin: 4px 0 16px; }

.actions { display: flex; gap: 10px; }
.primary, .ghost {
  flex: 1;
  border-radius: 12px;
  padding: 12px 14px;
  font-size: 0.96rem;
  cursor: pointer;
  border: 1px solid var(--line);
  transition: transform 0.12s ease, background 0.12s ease;
}
.primary { background: var(--accent); color: #06201e; font-weight: 800; border-color: transparent; }
.ghost { background: rgba(255, 255, 255, 0.05); color: var(--ink); flex: 0 0 auto; }
.primary:hover, .ghost:hover { transform: translateY(-2px); }

.foot { text-align: center; color: var(--muted); font-size: 0.75rem; margin-top: 22px; }

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}