@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;700&display=swap');
:root {
  --color-text: black;
  --color-text-soft: #282828;
  --color-bg: white;
  --color-bg-soft: whitesmoke;
  --radius-pill: 9999px;
  --border-width: 0.25rem;
  --transition-fast: 0.1s linear;
  --transition-med: 0.2s linear;
}
* {
  box-sizing: border-box;
}
[hidden] {
  display: none !important;
}
body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg);
  font-family: 'Space Grotesk', sans-serif;
}
.app {
  position: relative;
  width: 320px;
}
.calculator {
  width: 320px;
  padding: 20px;
  border-radius: 1.5rem;
  background: var(--color-bg);
  border: var(--border-width) solid var(--color-text);
}
.display {
  height: 70px;
  margin-bottom: 20px;
  border-radius: var(--radius-pill);
  background: var(--color-bg);
  border: var(--border-width) solid var(--color-text);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding: 0 1.5rem;
  font-size: 2rem;
  color: var(--color-text);
  font-weight: 700;
}
.keys {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}
.key {
  height: 60px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.25rem;
  font-weight: 700;
  background: var(--color-bg);
  color: var(--color-text);
  border: var(--border-width) solid var(--color-text);
  transition: border-style var(--transition-fast),
              background-color var(--transition-fast),
              color var(--transition-fast);
  pointer-events: none; 
}
.key:hover {
  border-style: dotted;
}
.key:active {
  background: var(--color-bg-soft);
}
.key-fn { background: var(--color-bg-soft); }
.key-op {
  background: var(--color-text);
  color: var(--color-bg);
  border-color: var(--color-text);
}
.key-op:hover { background: var(--color-text-soft); border-style: solid; }
.key-eq {
  background: var(--color-text);
  color: var(--color-bg);
  border-color: var(--color-text);
  font-weight: 700;
}
.key-eq:hover { background: var(--color-text-soft); border-style: solid; }
.key-wide { grid-column: span 2; }
.scan-highlight {
  background: var(--color-text) !important;
  color: var(--color-bg) !important;
  border-color: var(--color-text) !important;
  border-style: solid !important;
}
.game-overlay {
  position: absolute;
  inset: 0;
  border-radius: 1.5rem;
  background: var(--color-bg);
  border: var(--border-width) solid var(--color-text);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  padding: 1.5rem;
  text-align: center;
}
.game-status {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  color: var(--color-text);
  font-size: 0.95rem;
  min-height: 2.4rem;
}
.game-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}
.ttt-board {
  display: grid;
  grid-template-columns: repeat(3, 64px);
  grid-template-rows: repeat(3, 64px);
  gap: 10px;
}
.ttt-cell {
  border-radius: 1rem;
  border: var(--border-width) solid var(--color-text);
  background: var(--color-bg);
  color: var(--color-text);
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.75rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-style var(--transition-fast),
              background-color var(--transition-fast),
              color var(--transition-fast);
  pointer-events: none;
}
.snake-board {
  display: grid;
  grid-template-columns: repeat(8, 28px);
  grid-template-rows: repeat(8, 28px);
  gap: 2px;
}
.snake-cell {
  border: 2px solid var(--color-text);
  border-radius: 4px;
  background: var(--color-bg);
}
.snake-cell.snake-body { background: var(--color-text); }
.snake-cell.snake-food {
  background: var(--color-bg);
  border-style: dotted;
}
.reaction-pad {
  width: 160px;
  height: 160px;
  border-radius: var(--radius-pill);
  border: var(--border-width) solid var(--color-text);
  background: var(--color-bg);
  transition: background-color 0.1s linear;
}
.reaction-pad.go { background: var(--color-text); }
.light-indicator {
  width: 70px;
  height: 70px;
  border-radius: var(--radius-pill);
  border: var(--border-width) solid var(--color-text);
  background: var(--color-bg);
  transition: background-color 0.1s linear;
}
.light-indicator.go { background: var(--color-text); }
.progress-track {
  width: 240px;
  height: 24px;
  border-radius: var(--radius-pill);
  border: var(--border-width) solid var(--color-text);
  overflow: hidden;
  background: var(--color-bg);
}
.progress-fill {
  height: 100%;
  width: 0%;
  background: var(--color-text);
  transition: width 0.1s linear;
}
.dial {
  position: relative;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  border: var(--border-width) solid var(--color-text);
  background: var(--color-bg);
}
.dial-target {
  position: absolute;
  top: -4px;
  left: 50%;
  width: 8px;
  height: 20px;
  background: var(--color-text);
  border-radius: 4px;
  transform: translateX(-50%);
}
.dial-needle {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 4px;
  height: 90px;
  background: var(--color-text);
  border-radius: 2px;
  transform-origin: bottom center;
  transform: translate(-50%, -100%) rotate(0deg);
}
.flappy-field {
  position: relative;
  width: 260px;
  height: 200px;
  border: var(--border-width) solid var(--color-text);
  border-radius: 1rem;
  overflow: hidden;
  background: var(--color-bg);
}
.flappy-square {
  position: absolute;
  width: 22px;
  height: 22px;
  left: 30px;
  top: 80px;
  background: var(--color-text);
  border-radius: 4px;
}
.flappy-obstacle {
  position: absolute;
  width: 26px;
  background: var(--color-text);
}
.morse-target {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  color: var(--color-text);
  font-size: 0.95rem;
}
.morse-buffer {
  font-family: 'Space Grotesk', monospace;
  font-size: 1.6rem;
  letter-spacing: 5px;
  font-weight: 700;
  min-height: 2rem;
  color: var(--color-text);
}
.simon-board {
  display: grid;
  grid-template-columns: repeat(2, 70px);
  grid-template-rows: repeat(2, 70px);
  gap: 10px;
}
.simon-pad {
  border-radius: 1rem;
  border: var(--border-width) solid var(--color-text);
  background: var(--color-bg);
  transition: background-color 0.1s linear;
  pointer-events: none;
}
.simon-pad.flash { background: var(--color-text); }