:root {
  --bg-color: #EBEBEB; /* TE grey */
  --device-bg: #F8F8F8;
  --black: #222222;
  --accent: #FF4F00; /* TE orange */
  --lcd-bg: #DDE2E0; /* LCD tint */
  --white: #FFFFFF;
  --mt-color: #FF4F00; /* Mountain fold - Orange */
  --vl-color: #0080FF; /* Valley fold - Blue */
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'SF Mono', 'Roboto Mono', 'Courier New', monospace;
  text-transform: uppercase;
}

body {
  background-color: var(--bg-color);
  color: var(--black);
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 20px;
}

.device {
  background-color: var(--device-bg);
  border: 3px solid var(--black);
  border-radius: 6px;
  width: 100%;
  max-width: 480px;
  padding: 24px;
  box-shadow: 8px 8px 0px rgba(0, 0, 0, 0.1);
  position: relative;
}

/* Screws */
.screw {
  position: absolute;
  width: 8px;
  height: 8px;
  border: 2px solid var(--black);
  border-radius: 50%;
}
.screw.tl { top: 8px; left: 8px; }
.screw.tr { top: 8px; right: 8px; }
.screw.bl { bottom: 8px; left: 8px; }
.screw.br { bottom: 8px; right: 8px; }

header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  border-bottom: 3px solid var(--black);
  padding-bottom: 12px;
  margin-bottom: 24px;
}

.title {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: -1px;
}

.subtitle {
  font-size: 0.6rem;
  font-weight: 600;
  letter-spacing: 1px;
  margin-top: 4px;
}

.stats {
  text-align: right;
  font-size: 0.8rem;
  font-weight: 700;
}

.display {
  background-color: var(--lcd-bg);
  border: 3px solid var(--black);
  border-radius: 4px;
  position: relative;
  margin-bottom: 24px;
  overflow: hidden;
  height: 320px;
}

#game-canvas-container {
  width: 100%;
  height: 100%;
}

canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.led {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: #888;
  border: 1px solid var(--black);
  z-index: 10;
}

.led.active { background-color: var(--accent); box-shadow: 0 0 8px var(--accent); }
.led.correct { background-color: #00FF00; box-shadow: 0 0 8px #00FF00; }
.led.wrong { background-color: #FF0000; box-shadow: 0 0 8px #FF0000; }

.overlay {
  position: absolute;
  inset: 0;
  background-color: rgba(221, 226, 224, 0.8);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 5;
}

.overlay.hidden { display: none; }

#message-text {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--black);
}

.timer-bar {
  position: absolute;
  bottom: 0;
  left: 0;
  height: 6px;
  background-color: var(--accent);
  width: 0%;
  transition: width 0.1s linear;
}

.controls {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.ui-button-group {
  display: grid;
  grid-template-columns: 2fr 1.2fr;
  gap: 12px;
}

button {
  all: unset;
  box-sizing: border-box;
  background-color: transparent;
  border: 2px solid var(--black);
  border-radius: 4px;
  text-align: center;
  padding: 14px 8px;
  font-size: 0.8rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.1s ease;
  user-select: none;
}

button:hover {
  background-color: var(--black);
  color: var(--device-bg);
}

button:active { transform: translateY(2px); }

.btn-primary { background-color: var(--black); color: var(--white); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

.instruction {
  background-color: #EEE;
  padding: 10px;
  border-radius: 4px;
  font-size: 0.7rem;
  font-weight: 700;
  text-align: center;
  color: #666;
}