/* METRIDIUM v2 — HUD */

.hud-overlay {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(1, 2, 6, 0.78);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--duration-normal) ease, visibility var(--duration-normal) ease;
  z-index: var(--z-hud);
}

.hud-overlay.is-open {
  opacity: 1;
  visibility: visible;
}

.hud-panel {
  width: min(620px, 94vw);
  max-height: 88vh;
  display: flex;
  flex-direction: column;
  border-radius: var(--radius-md);
  border: 1px solid var(--white-08);
  background:
    linear-gradient(135deg, rgba(5, 8, 16, 0.96), rgba(8, 14, 28, 0.94)),
    rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(28px);
  -webkit-backdrop-filter: blur(28px);
  box-shadow:
    0 40px 80px rgba(0, 0, 0, 0.55),
    inset 0 1px 0 var(--white-04);
  transform: translateY(16px) scale(0.97);
  transition: transform var(--duration-normal) var(--ease-out-back);
  overflow: hidden;
}

.hud-overlay.is-open .hud-panel {
  transform: translateY(0) scale(1);
}

.hud-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--white-06);
}

.hud-brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.hud-title {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.3em;
  color: rgba(255, 255, 255, 0.85);
}

.hud-subtitle {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.15em;
  color: rgba(148, 226, 255, 0.3);
  text-transform: uppercase;
}

.hud-header-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.hud-close {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 1px solid var(--white-08);
  background: var(--white-04);
  color: rgba(255, 255, 255, 0.4);
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: border-color var(--duration-fast), color var(--duration-fast);
}

.hud-close:hover {
  border-color: var(--white-25);
  color: rgba(255, 255, 255, 0.8);
}

.hud-search {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.65rem 0.85rem;
  border-radius: 8px;
  border: 1px solid var(--white-06);
  background: rgba(0, 0, 0, 0.2);
  margin-bottom: 1.25rem;
}

.hud-body {
  flex: 1;
  overflow-y: auto;
  padding: 1rem 1.25rem;
  scrollbar-width: thin;
  scrollbar-color: var(--white-08) transparent;
}

.hud-body::-webkit-scrollbar { width: 4px; }
.hud-body::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-pill);
}

.hud-section {
  margin-bottom: 1.25rem;
}

.hud-nav-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.5rem;
}

.hud-nav-card {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 0.75rem 0.85rem;
  border-radius: 8px;
  border: 1px solid var(--white-06);
  background: var(--white-04);
  text-decoration: none;
  color: inherit;
  cursor: pointer;
  transition: border-color var(--duration-fast), background var(--duration-fast);
}

.hud-nav-card:hover {
  border-color: rgba(148, 226, 255, 0.2);
  background: rgba(148, 226, 255, 0.04);
}

.hud-scene-list {
  display: flex;
  flex-direction: column;
  gap: 1px;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--white-04);
}

.hud-scene-btn {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  padding: 0.65rem 0.85rem;
  background: var(--white-04);
  border: none;
  color: inherit;
  text-align: left;
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: background 0.15s;
}

.hud-scene-btn p {
  margin: 0;
  font-size: 0.68rem;
  color: var(--white-35);
  letter-spacing: normal;
}

.hud-scene-btn:hover,
.hud-scene-btn.is-selected {
  background: rgba(0, 255, 163, 0.06);
}

.hud-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.65rem 1.25rem;
  border-top: 1px solid var(--white-04);
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--white-25);
  letter-spacing: 0.08em;
}

.hud-status-dot {
  display: inline-block;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--green-glow);
  box-shadow: 0 0 6px var(--green-glow);
  margin-right: 5px;
  vertical-align: middle;
}

@media (max-width: 500px) {
  .hud-nav-grid {
    grid-template-columns: 1fr;
  }
}