.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: var(--touch-min);
  min-height: var(--touch-min);
  padding: 1.5vmin 3.33vmin;
  border: none;
  border-radius: var(--radius-pill);
  font-family: var(--font-family);
  font-size: var(--font-body);
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--transition), background var(--transition);
  will-change: transform;
}

.btn:active {
  transform: scale(0.96);
}

.btn-primary {
  background: var(--primary);
  color: var(--text-primary);
}

.btn-primary:active {
  background: var(--primary-hover);
}

.btn-secondary {
  background: var(--surface);
  color: var(--text-primary);
  border: 2px solid var(--divider);
}

.btn-secondary:active {
  background: var(--surface-hover);
}

.card {
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--divider);
  padding: 2.22vmin;
}

.progress-bar-track {
  width: 100%;
  height: clamp(8px, 0.74vmin, 16px);
  background: var(--surface);
  border-radius: 8px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: var(--primary);
  border-radius: 8px;
  transition: width 600ms ease-out;
}

.score-display {
  display: flex;
  align-items: center;
  gap: 1.11vmin;
  font-size: var(--font-h3);
  font-weight: 700;
  color: var(--primary);
}

.stage-indicator {
  display: flex;
  align-items: center;
  gap: clamp(8px, 0.93vmin, 20px);
  margin-top: 1.11vmin;
}

.stage-dot {
  width: clamp(12px, 1.11vmin, 24px);
  height: clamp(12px, 1.11vmin, 24px);
  border-radius: 50%;
  background: var(--divider);
  transition: background var(--transition), transform var(--transition);
}

.stage-dot.completed {
  background: var(--success);
}

.stage-dot.current {
  background: var(--primary);
  transform: scale(1.4);
}

.stage-connector {
  width: clamp(20px, 2.22vmin, 48px);
  height: clamp(2px, 0.19vmin, 4px);
  background: var(--divider);
}

.stage-connector.completed {
  background: var(--success);
}

.header-bar {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 1.48vmin;
}

.header-bar .stage-label {
  font-size: var(--font-small);
  font-weight: 500;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: clamp(1px, 0.19vmin, 4px);
}

.timer-display {
  display: flex;
  align-items: center;
  gap: 0.74vmin;
  font-size: var(--font-h3);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.timer-display.warning {
  color: var(--warning);
}

.timer-display.critical {
  color: var(--error);
}

.watermark {
  position: fixed;
  top: clamp(8px, 1vmin, 24px);
  right: clamp(12px, 1.5vmin, 40px);
  font-size: var(--font-xs);
  color: rgba(255, 255, 255, 0.15);
  letter-spacing: 1px;
  pointer-events: none;
  z-index: 9999;
  text-transform: lowercase;
}

.overlay {
  position: fixed;
  inset: 0;
  background: rgba(21, 21, 21, 0.92);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.overlay.active {
  opacity: 1;
  visibility: visible;
  pointer-events: all;
}

.feedback-icon {
  width: clamp(60px, 7.41vmin, 160px);
  height: clamp(60px, 7.41vmin, 160px);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: clamp(30px, 3.7vmin, 80px);
  margin-bottom: 2.22vmin;
}

.feedback-icon.success {
  background: rgba(12, 191, 133, 0.15);
  color: var(--success);
  border: 3px solid var(--success);
}

.feedback-icon.error {
  background: rgba(209, 57, 57, 0.15);
  color: var(--error);
  border: 3px solid var(--error);
}

.keyboard-row {
  display: flex;
  gap: clamp(4px, 0.56vmin, 12px);
  justify-content: center;
  margin-bottom: clamp(4px, 0.56vmin, 12px);
}

.key {
  min-width: clamp(36px, 4.63vmin, 100px);
  height: clamp(36px, 5.56vmin, 120px);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--surface);
  border: 2px solid var(--divider);
  border-radius: var(--radius-sm);
  font-size: var(--font-body);
  font-weight: 600;
  font-family: var(--font-family);
  color: var(--text-primary);
  cursor: pointer;
  transition: background 200ms ease-out, border-color 200ms ease-out, transform 100ms ease-out;
}

.key:active {
  transform: scale(0.93);
  background: var(--surface-hover);
}

.key.wide {
  min-width: clamp(60px, 8.33vmin, 180px);
  font-size: var(--font-small);
}

.key.correct {
  background: var(--success);
  border-color: var(--success);
}

.key.present {
  background: var(--warning);
  border-color: var(--warning);
  color: #151515;
}

.key.absent {
  background: #1a1a1a;
  border-color: #1a1a1a;
  color: var(--text-secondary);
}