* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  background: #0b0e14;
  color: #e7ecf3;
  -webkit-user-select: none;
  user-select: none;
}

#app {
  max-width: 1000px;
  margin: 0 auto;
  padding: 12px;
}

#topbar {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 6px 4px 12px;
}
.brand { font-size: 20px; font-weight: 700; }
.timer {
  margin-left: auto;
  font-variant-numeric: tabular-nums;
  font-size: 22px;
  font-weight: 700;
  color: #facc15;
}
.pb { font-variant-numeric: tabular-nums; color: #8aa0b6; font-size: 14px; }

#stage { position: relative; }

canvas {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 10px;
  background: #0d1018;
  box-shadow: 0 6px 24px rgba(0,0,0,0.45);
  cursor: crosshair;
}

.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  text-align: center;
  background: rgba(7, 10, 16, 0.82);
  border-radius: 10px;
  padding: 24px;
}
.overlay.hidden { display: none; }
.overlay h2 { margin: 0; font-size: 34px; }
.overlay p { margin: 0; color: #b8c4d2; }
.overlay button {
  margin-top: 8px;
  padding: 10px 22px;
  font-size: 16px;
  font-weight: 700;
  color: #0b0e14;
  background: #facc15;
  border: 0;
  border-radius: 8px;
  cursor: pointer;
}
.overlay button:hover { background: #fde047; }

#controls {
  display: grid;
  grid-template-columns: 1fr 1fr 1.2fr;
  gap: 12px;
  margin-top: 12px;
}
.panel {
  background: #131826;
  border: 1px solid #1f2940;
  border-radius: 10px;
  padding: 10px 12px;
}
.panel h3 { margin: 0 0 8px; font-size: 14px; letter-spacing: .02em; }
.panel .hint { color: #6b7c92; font-weight: 400; font-size: 12px; }
.panel.small p { margin: 0 0 6px; font-size: 12px; line-height: 1.4; color: #aebacb; }
.panel.small .keys { color: #6b7c92; }

.btnrow { display: flex; flex-wrap: wrap; gap: 8px; }
.gbtn {
  flex: 1 1 0;
  min-width: 84px;
  padding: 8px 6px;
  border-radius: 8px;
  border: 1px solid #2a3550;
  background: #1a2236;
  color: #e7ecf3;
  cursor: pointer;
  font-size: 12px;
  line-height: 1.3;
  text-align: center;
}
.gbtn .nm { display: block; font-weight: 700; font-size: 13px; }
.gbtn .ct { display: block; color: #facc15; font-variant-numeric: tabular-nums; }
.gbtn .ds { display: block; color: #8aa0b6; font-size: 11px; }
.gbtn:hover { border-color: #3a4a70; background: #20293f; }
.gbtn.selected { border-color: #facc15; background: #2a2f1a; }
.gbtn:disabled { opacity: .45; cursor: not-allowed; }

@media (max-width: 720px) {
  #controls { grid-template-columns: 1fr; }
}