:root {
  color-scheme: dark;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  overflow: hidden;
  background: #0f1220;
  color: #fff;
}

#game-canvas {
  display: block;
  width: 100vw;
  height: 100vh;
}

#ui-overlay {
  position: fixed;
  inset: 0;
  pointer-events: none;
}

.panel {
  display: none;
  position: absolute;
  background: rgba(0, 0, 0, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 12px;
  padding: 16px;
  max-width: 560px;
  pointer-events: auto;
}

.panel.visible {
  display: block;
}

#start-panel,
#win-panel,
#quiz-panel {
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  width: min(90vw, 560px);
}

#hud {
  top: 16px;
  left: 16px;
  max-width: 420px;
}

.choice-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
  margin: 16px 0;
}

.choice-btn,
#submit-answer,
#restart-btn {
  background: linear-gradient(135deg, #69f, #b6f);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 10px 16px;
  font-size: 1rem;
  cursor: pointer;
}

.choice-btn:hover,
#submit-answer:hover,
#restart-btn:hover {
  filter: brightness(1.1);
}

.small-help {
  opacity: 0.85;
  font-size: 0.95rem;
}

.quiz-input-row {
  display: flex;
  gap: 8px;
  justify-content: center;
}

#quiz-answer {
  border-radius: 8px;
  border: 1px solid #667;
  background: #1e243d;
  color: #fff;
  padding: 10px;
  min-width: 200px;
}

#quiz-feedback {
  min-height: 1.25rem;
}