/* ── Theme History HUD ── */
/* Two stacked pills: a small handle tab on top (with a chevron), and a
   wider track pill below (with theme icons).  The handle tab looks
   identical in tucked and expanded states — the track just shows/hides
   beneath it.  That way the chevron's visual position is always "a small
   tab hanging off the nav bar", never embedded in the track. */

.theme-history-hud {
  position: absolute;
  top: 100%;
  left: 50%;
  translate: -50% -4px;
  margin-top: 8px;
  opacity: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  pointer-events: auto;
  transition:
    opacity 0.5s ease-out,
    translate 0.5s cubic-bezier(0.22, 1, 0.36, 1);
}
.theme-history-hud.ready {
  opacity: 1;
  translate: -50% 0;
}

/* ── Handle pill ── */
/* Small floating tab at the top of the HUD column.  A single chevron
   button rotates with the HUD's tucked/expanded state. */
.thh-handle-slot {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2px 8px;
  background: rgba(10, 18, 32, 0.5);
  border: 1px solid rgba(120, 160, 220, 0.14);
  border-radius: 100px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition:
    background 0.3s ease,
    border-color 0.3s ease;
}
.theme-history-hud:not(.tucked) .thh-handle-slot {
  background: rgba(10, 18, 32, 0.6);
  border-color: rgba(120, 160, 220, 0.22);
}
.thh-handle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 12px;
  padding: 0;
  background: none;
  border: none;
  color: rgba(180, 210, 240, 0.55);
  transition: color 0.2s ease;
}
.thh-handle:hover,
.thh-handle:focus-visible {
  color: rgba(200, 230, 255, 0.95);
  outline: none;
}
.thh-handle svg {
  width: 12px;
  height: 6px;
  transition: transform 0.25s ease;
}
/* Chevron points down when tucked (invitation to expand), and flips up
   when the HUD is open (invitation to tuck). */
.theme-history-hud:not(.tucked) .thh-handle svg {
  transform: rotate(180deg);
}

/* ── Track pill ── */
/* Separate pill below the handle, holding the theme icons and labels.
   Hidden entirely when tucked. */
.thh-track {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  max-width: calc(100vw - 1rem);
  background: rgba(10, 18, 32, 0.55);
  border: 1px solid rgba(120, 160, 220, 0.18);
  border-radius: 100px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition:
    padding 0.3s cubic-bezier(0.22, 1, 0.36, 1),
    background 0.3s ease,
    border-color 0.3s ease;
}
.theme-history-hud.expanded .thh-track {
  padding: 8px 14px;
  background: rgba(10, 18, 32, 0.82);
  border-color: rgba(120, 160, 220, 0.32);
}
.theme-history-hud.tucked .thh-track {
  display: none;
}

.thh-slot {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  padding: 3px 4px;
  margin: 0;
  /* Match the label's font-size so `1ch` in --thh-slot-width resolves at
     label scale — otherwise ch inherits the 16px body size and slots are
     roughly 2x wider than needed. */
  font-size: 9px;
  width: var(--thh-slot-width, 8ch);
  background: none;
  border: none;
  border-radius: 8px;
  color: rgba(255, 255, 255, 0.4);
  font-family: "DM Mono", monospace;
  cursor: default;
  transition:
    color 0.25s ease,
    background 0.25s ease,
    transform 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}
.thh-slot.discovered {
  color: var(--theme-color, #7dbfe8);
}
.thh-slot.discovered:hover {
  background: rgba(255, 255, 255, 0.06);
  transform: translateY(-1px);
}
.thh-slot.discovered:focus-visible {
  outline: 1px solid var(--theme-color, #7dbfe8);
  outline-offset: 2px;
}
.thh-slot.active::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -5px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--theme-color, #7dbfe8);
  box-shadow: 0 0 6px 1px var(--theme-color, #7dbfe8);
  translate: -50% 0;
}

.thh-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  filter: drop-shadow(0 0 4px currentColor);
}
.thh-slot.undiscovered .thh-icon {
  filter: none;
  opacity: 0.35;
}

.thh-label {
  font-size: 9px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  white-space: nowrap;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition:
    max-height 0.3s ease,
    opacity 0.25s ease 0.05s;
}
.theme-history-hud.expanded .thh-label {
  max-height: 14px;
  opacity: 0.9;
}

/* Active-theme pulse — soft halo in the theme's accent color */
@keyframes thh-pulse {
  0% {
    box-shadow: 0 0 0 0 var(--theme-color, #7dbfe8);
    opacity: 0.6;
  }
  100% {
    box-shadow: 0 0 0 14px transparent;
    opacity: 0;
  }
}
.thh-stats-tip {
  display: none;
  position: absolute;
  bottom: calc(100% + 6px);
  left: 50%;
  translate: -50% 0;
  white-space: nowrap;
  padding: 3px 7px;
  background: rgba(10, 18, 32, 0.95);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 4px;
  font-family: "DM Mono", monospace;
  font-size: 0.5rem;
  color: rgba(255, 255, 255, 0.65);
  letter-spacing: 0.04em;
  pointer-events: none;
  z-index: 1;
}
.thh-slot.showing-stats .thh-stats-tip {
  display: block;
}
.thh-slot.pulse .thh-icon {
  animation: thh-pulse 1.2s ease-out;
}

/* Newly discovered — periodic sheen sweep for the first few seconds.
   Uses the same pattern as card-shimmer: linear easing + full off-screen
   sweep per cycle so there's no visible pause at either edge when looping. */
@keyframes thh-shimmer {
  0% {
    background-position: 150% 0;
  }
  100% {
    background-position: -150% 0;
  }
}
.thh-slot.just-discovered::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 8px;
  pointer-events: none;
  background: linear-gradient(
    110deg,
    transparent 40%,
    rgba(255, 255, 255, 0.28) 50%,
    transparent 60%
  );
  background-size: 400% 100%;
  animation: thh-shimmer 2.2s linear infinite;
}

/* Reduced motion — keep HUD functional but drop shimmer + pulse */
@media (prefers-reduced-motion: reduce) {
  .thh-slot.just-discovered::before,
  .thh-slot.pulse .thh-icon {
    animation: none;
  }
}

/* Narrow viewport — below this, the labelled track would overflow past
   nav's edges even with all five labels fitting individually (gaps +
   padding accumulate).  Hide labels, collapse slot width to the icon. */
@media (max-width: 560px) {
  .thh-track {
    gap: 2px;
  }
  .thh-slot {
    width: auto;
    padding: 3px 6px;
  }
  .thh-label {
    display: none;
  }
}