/* === Fraction Tray === */
.frac-tray {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  max-width: 430px;
  margin: 0 auto;
  max-height: 70vh;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  background: var(--color-bg-raised);
  border-top: 2px solid var(--color-imperial);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  z-index: 100;
  display: flex;
  flex-direction: column;
  box-shadow: 0 -8px 32px rgba(0, 0, 0, 0.4);
}
.frac-tray[hidden] { display: none; }

.frac-tray-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px var(--space-4);
  border-bottom: 1px solid var(--color-border);
}
.frac-tray-title {
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-imperial);
  text-transform: uppercase;
  letter-spacing: 1px;
}
.frac-tray-precision {
  font-size: 10px;
  color: var(--color-text-muted);
}
.frac-tray-close {
  width: 28px;
  height: 28px;
  border: none;
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--color-text-muted);
  font-size: var(--text-lg);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.frac-tray-hint {
  text-align: center;
  font-size: 9px;
  color: var(--color-text-muted);
  opacity: 0.5;
  padding: var(--space-1) 0 var(--space-2);
}

/* --- 16ths Grid --- */
.frac-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
  padding: 10px var(--space-4);
}

.frac-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 10px 4px;
  min-height: 48px;
  border: 1.5px solid var(--color-imperial-border);
  border-radius: var(--radius-md);
  background: var(--color-imperial-dim);
  cursor: pointer;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  -webkit-user-select: none;
}
.frac-btn:active {
  background: rgba(255, 152, 0, 0.3);
  border-color: var(--color-imperial);
  transform: scale(0.95);
}
.frac-main { font-size: var(--text-base); font-weight: 700; color: var(--color-imperial); line-height: 1.1; }
.frac-dec { font-size: 9px; color: var(--color-text-muted); opacity: 0.6; margin-top: 2px; }

/* --- 32nds Section --- */
.frac-fine-label {
  padding: 6px var(--space-4) 0;
  font-size: 9px;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  opacity: 0.5;
  border-top: 1px solid var(--color-border);
}

.frac-grid-fine {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 5px;
  padding: 6px var(--space-4) var(--space-3);
}

.frac-btn-fine {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 6px 4px;
  min-height: 36px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background: var(--color-surface);
  cursor: pointer;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}
.frac-btn-fine:active {
  background: var(--color-imperial-dim);
  border-color: var(--color-imperial);
}
.frac-btn-fine .frac-main {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-muted);
}
.frac-btn-fine:active .frac-main { color: var(--color-imperial); }

@media (prefers-reduced-motion: reduce) {
  .frac-tray { transition: none; }
  .frac-btn:active, .frac-btn-fine:active { transform: none; }
}