:root { --bg: #05070f; --ink: #cdd6f4; --accent: #22e0ff; }

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background:
    radial-gradient(1200px 600px at 50% -10%, #14193a 0%, transparent 60%),
    var(--bg);
  color: var(--ink);
  font-family: system-ui, -apple-system, "Segoe UI", "Hiragino Sans", "Noto Sans JP", sans-serif;
}

body {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 20px;
  gap: 14px;
}

.stage-wrap { width: min(100vw - 40px, 1280px); }

canvas#game {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 16px;
  box-shadow: 0 30px 90px rgba(0, 0, 0, .6), inset 0 0 0 1px rgba(255, 255, 255, .05);
  touch-action: none;
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 12px;
  align-items: center;
  font-size: 13px;
  color: #9aa6c8;
}

.legend b { color: var(--accent); margin-right: 2px; letter-spacing: .04em; }

.legend span {
  background: rgba(255, 255, 255, .05);
  padding: 5px 11px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, .07);
  white-space: nowrap;
}

.legend kbd {
  font: inherit;
  font-weight: 700;
  color: #e7ecff;
  background: rgba(55, 192, 255, .14);
  border-radius: 5px;
  padding: 1px 6px;
  margin: 0 1px;
}