/* ── Campus chips ── */
.campus-chips {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.campus-chips-section {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  align-items: flex-start;
}

.campus-chips-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.campus-chip {
  padding: 0.4rem 1rem;
  border-radius: 999px;

  font-size: 1rem;
  font-weight: 600;
  font-family: "Nunito", -apple-system, BlinkMacSystemFont,
    "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

  background: color-mix(in srgb, var(--text-color-primary) 8%, transparent);
  border: 1.5px solid color-mix(in srgb, var(--text-color-primary) 15%, transparent);
  color: color-mix(in srgb, var(--text-color-primary) 70%, transparent);

  cursor: pointer;

  transition:
    background 0.2s ease,
    border-color 0.2s ease,
    color 0.2s ease,
    box-shadow 0.2s ease,
    scale 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);

  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

.campus-chip.active {
  background: color-mix(in srgb, var(--text-color-accent) 18%, var(--background-color-secondary));
  border-color: color-mix(in srgb, var(--text-color-accent) 45%, transparent);
  color: var(--text-color-accent);
}

@media (hover: hover) {
  .campus-chip:not(.active):hover {
    background: color-mix(in srgb, var(--text-color-primary) 14%, transparent);
    border-color: color-mix(in srgb, var(--text-color-primary) 25%, transparent);
    color: var(--text-color-primary);
    scale: 1.05;
    box-shadow: 0 4px 14px color-mix(in srgb, var(--text-color-primary) 8%, transparent);
  }

  .campus-chip.active:hover {
    background: color-mix(in srgb, var(--text-color-accent) 28%, var(--background-color-secondary));
    scale: 1.05;
    box-shadow: 0 4px 16px color-mix(in srgb, var(--text-color-accent) 20%, transparent);
  }
}

.campus-chip:active {
  scale: 0.94;
}

/* Group chip — always secondary background, subtle glow when active */
.campus-chip.campus-chip-group {
  display: flex;
  align-items: center;
  padding: 0.15rem 0;
  cursor: default;

  background: var(--background-color-secondary);
  border-color: color-mix(in srgb, var(--text-color-primary) 12%, transparent);
  color: color-mix(in srgb, var(--text-color-primary) 70%, transparent);
}

.campus-chip.campus-chip-group.active {
  background: var(--background-color-secondary);
  border-color: color-mix(in srgb, var(--text-color-accent) 45%, transparent);
  color: var(--text-color-accent);
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--text-color-accent) 10%, transparent);
}

@media (hover: hover) {
  .campus-chip.campus-chip-group:not(.active):hover {
    background: var(--background-color-secondary);
    border-color: color-mix(in srgb, var(--text-color-primary) 22%, transparent);
    color: var(--text-color-primary);
    scale: 1.03;
    box-shadow: 0 4px 12px color-mix(in srgb, var(--text-color-primary) 8%, transparent);
  }

  .campus-chip.campus-chip-group.active:hover {
    background: var(--background-color-secondary);
    scale: 1.03;
    box-shadow:
      0 0 0 2px color-mix(in srgb, var(--text-color-accent) 15%, transparent),
      0 4px 14px color-mix(in srgb, var(--text-color-accent) 18%, transparent);
  }
}

.campus-chip-group-trigger {
  position: relative;
  padding: 0.4rem 0.75rem 0.4rem 1rem;

  background: none;
  border: none;

  font-size: 0.9rem;
  font-weight: 600;
  font-family: "Nunito", -apple-system, BlinkMacSystemFont,
    "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: inherit;

  cursor: pointer;
  white-space: nowrap;

  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

.campus-chip-group-trigger::after {
  content: '';
  position: absolute;
  right: 0.4rem;
  top: 50%;
  width: 0.28em;
  height: 0.28em;
  border-right: 1.5px solid currentColor;
  border-top: 1.5px solid currentColor;
  opacity: 0;
  transform: translateY(-50%) rotate(45deg) scale(0.5);
  transition:
    opacity 0.15s ease,
    transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@media (hover: hover) {
  .campus-chip-group:not(.active):hover .campus-chip-group-trigger::after {
    opacity: 0.7;
    transform: translateY(-50%) rotate(45deg) scale(1);
  }
}

/* Wrapper: smooth width expansion via grid column trick */
.campus-chip-suboptions-wrapper {
  display: grid;
  grid-template-columns: 0fr;
  overflow-x: clip;
  opacity: 0;

  transition:
    grid-template-columns 0.35s cubic-bezier(0.16, 1, 0.3, 1),
    opacity 0.2s ease;
}

.campus-chip-group.active .campus-chip-suboptions-wrapper {
  grid-template-columns: 1fr;
  opacity: 1;
}

/* Inner flex container */
.campus-chip-suboptions {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0.25rem;
  padding-right: 0.35rem;
  min-width: 0;
}

/* Thin divider between label and sub-options */
.campus-chip-suboptions::before {
  content: '';
  flex-shrink: 0;
  width: 1px;
  height: 1.1em;
  margin-right: 0.1rem;
  background: color-mix(in srgb, currentColor 25%, transparent);
}

/* Sliding indicator — absolutely positioned behind sub-chips */
.campus-subchip-indicator {
  position: absolute;
  left: 0; /* anchor; visual position driven by translateX */
  inset-block: 0;
  border-radius: 999px;
  background: color-mix(in srgb, var(--text-color-accent) 18%, transparent);
  border: 1.5px solid color-mix(in srgb, var(--text-color-accent) 40%, transparent);
  pointer-events: none;
  will-change: transform, width;
  transition:
    transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1),
    width     0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.campus-subchip {
  padding: 0.2rem 0.6rem;
  border-radius: 999px;

  font-size: 0.8rem;
  font-weight: 600;
  font-family: "Nunito", -apple-system, BlinkMacSystemFont,
    "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

  position: relative;
  z-index: 1;

  background: transparent;
  border: 1.5px solid transparent;
  color: color-mix(in srgb, var(--text-color-primary) 55%, transparent);

  cursor: pointer;
  white-space: nowrap;

  transition:
    color 0.18s ease,
    scale 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);

  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

.campus-subchip.active {
  color: var(--text-color-accent);
}

@media (hover: hover) {
  .campus-subchip:not(.active):hover {
    color: var(--text-color-primary);
    scale: 1.08;
  }

  .campus-subchip.active:hover {
    scale: 1.08;
  }
}

.campus-subchip:active {
  scale: 0.92;
}