.spool-rack {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  justify-content: flex-start;
  flex-wrap: wrap;
}

.spool-rack-square {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--border);
  box-shadow: 0 2px 8px 0 #0001;
  cursor: pointer;
  transition: border 0.2s, box-shadow 0.2s, transform 0.18s cubic-bezier(.4, 2, .6, 1), opacity 0.18s;
  position: relative;
  border-radius: 0.5rem;
  background: #fff;
  opacity: 0;
  transform: scale(0.8);
  animation: rack-pop 0.22s cubic-bezier(.4, 2, .6, 1) forwards;
}

.spool-rack-square:nth-child(1) { animation-delay: 0.04s; }
.spool-rack-square:nth-child(2) { animation-delay: 0.08s; }
.spool-rack-square:nth-child(3) { animation-delay: 0.12s; }
.spool-rack-square:nth-child(4) { animation-delay: 0.16s; }
.spool-rack-square:nth-child(5) { animation-delay: 0.20s; }
.spool-rack-square:nth-child(6) { animation-delay: 0.24s; }
.spool-rack-square:nth-child(7) { animation-delay: 0.28s; }
.spool-rack-square:nth-child(8) { animation-delay: 0.32s; }
.spool-rack-square:nth-child(9) { animation-delay: 0.36s; }
.spool-rack-square:nth-child(10) { animation-delay: 0.40s; }

@keyframes rack-pop {
  0% { opacity: 0; transform: scale(0.8); }
  80% { opacity: 1; transform: scale(1.08); }
  100% { opacity: 1; transform: scale(1); }
}

.spool-rack-square:hover {
  border-color: var(--primary);
  box-shadow: 0 4px 16px 0 #00bcd44d;
  z-index: 2;
  transform: translateY(-4px) scale(1.04);
}

.spool-rack-fillbar {
  position: absolute;
  bottom: 0;
  left: 0;
  height: 6px;
  border-radius: 0 0 0.5rem 0.5rem;
  background: var(--primary);
  transition: width 0.3s;
}

.spool-tooltip {
  display: none;
  position: absolute;
  left: 50%;
  top: -44px;
  transform: translateX(-50%) translateY(8px);
  background: var(--popover);
  color: var(--popover-foreground);
  padding: 0.5em 1em;
  border-radius: 0.5em;
  box-shadow: 0 2px 8px 0 #0002;
  font-size: 0.9em;
  white-space: nowrap;
  z-index: 10;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.18s, transform 0.18s;
}

.spool-rack-square:hover .spool-tooltip,
.spool-rack-square:focus .spool-tooltip {
  display: block;
  opacity: 1;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.spool-rack-square.low {
  border: 3px solid #ef4444 !important;
  box-shadow: 0 0 0 2px #ef4444cc;
  animation: rack-pop 0.22s cubic-bezier(.4, 2, .6, 1) forwards, low-pulse 1.5s infinite alternate;
}

@keyframes low-pulse {
  0% {
    box-shadow: 0 0 0 2px #ef4444cc;
    transform: scale(1);
  }
  100% {
    box-shadow: 0 0 0 6px #ef444466;
    transform: scale(1.07);
  }
}

.spool-rack-square.low::after {
  content: '!';
  color: #ef4444;
  font-weight: bold;
  font-size: 1.2em;
  position: absolute;
  top: 2px;
  right: 6px;
  background: #fff;
  border-radius: 50%;
  width: 1.1em;
  height: 1.1em;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 1px 4px #0002;
  animation: badge-pop 0.4s cubic-bezier(.4, 2, .6, 1);
}

@keyframes badge-pop {
  0% {
    transform: scale(0.7);
    opacity: 0;
  }
  80% {
    transform: scale(1.2);
    opacity: 1;
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}

.spool-card {
  transition: box-shadow 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
  cursor: pointer;
}

.spool-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 188, 212, 0.3);
  border-color: var(--primary);
}

.expand-panel {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, opacity 0.3s ease;
}

.expand-panel.open {
  max-height: 1000px;
  opacity: 1;
}

button {
  transition: transform 0.1s ease, box-shadow 0.2s ease;
}

button:active {
  transform: scale(0.97);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

button:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
}

.fade-in {
  animation: fade-in 200ms ease-in-out forwards;
}

@keyframes fade-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}