/* ─── Skip Link (a11y) ───────────────────────────────────────────── */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: #00ff41;
  color: #0c0a08;
  padding: 8px 16px;
  z-index: 10000;
  text-decoration: none;
  font-family: monospace;
}
.skip-link:focus {
  top: 0;
}

/* Screen-reader only (a11y) */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ─── HUD + Info Panels + Overlays ───────────────────────────────── */

/* Crosshair */
#crosshair {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 4px;
  height: 4px;
  border: 1px solid rgba(0, 255, 65, 0.6);
  border-radius: 50%;
  pointer-events: none;
  z-index: 20;
  display: none;
}

/* HUD prompt */
#hud-prompt {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  font-family: 'Press Start 2P', 'Courier New', monospace;
  font-size: clamp(8px, 1.1vw, 11px);
  color: rgba(0, 255, 65, 0.7);
  text-align: center;
  pointer-events: none;
  z-index: 20;
  transition: opacity 0.5s;
  text-shadow: 0 0 10px rgba(0, 255, 65, 0.3);
}

/* Info panel (proximity) */
#info-panel {
  position: fixed;
  bottom: 5rem;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(12, 10, 8, 0.92);
  border: 1px solid rgba(0, 255, 65, 0.3);
  padding: 1rem 1.5rem;
  max-width: min(90vw, 420px);
  font-family: 'Press Start 2P', 'Courier New', monospace;
  z-index: 20;
  display: none;
  backdrop-filter: blur(4px);
}

#info-panel::before {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    rgba(0, 255, 65, 0.02) 0px,
    rgba(0, 255, 65, 0.02) 1px,
    transparent 1px,
    transparent 3px
  );
  pointer-events: none;
}

.info-name {
  font-size: clamp(10px, 1.3vw, 13px);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.info-desc {
  font-size: clamp(8px, 1vw, 10px);
  color: rgba(255, 255, 255, 0.75);
  line-height: 1.8;
  margin-bottom: 0.5rem;
  font-family: 'Courier New', monospace;
}

.info-action {
  font-size: clamp(8px, 1vw, 10px);
  color: #00ff41;
  opacity: 0.8;
}

/* Detail overlay */
#overlay-panel {
  position: fixed;
  inset: 0;
  z-index: 50;
  background: rgba(12, 10, 8, 0.95);
  display: none;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(8px);
}

.overlay-content {
  background: rgba(18, 16, 12, 0.95);
  border: 1px solid rgba(0, 255, 65, 0.3);
  max-width: min(90vw, 560px);
  padding: 2rem;
  font-family: 'Press Start 2P', 'Courier New', monospace;
}

.overlay-content::before {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    rgba(0, 255, 65, 0.015) 0px,
    rgba(0, 255, 65, 0.015) 1px,
    transparent 1px,
    transparent 3px
  );
  pointer-events: none;
}

.overlay-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid rgba(0, 255, 65, 0.2);
}

.overlay-title {
  font-size: clamp(11px, 1.4vw, 14px);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.overlay-close-btn {
  background: none;
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: rgba(255, 255, 255, 0.7);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 0.2rem 0.5rem;
  font-family: inherit;
  transition: border-color 0.2s;
}

.overlay-close-btn:hover {
  border-color: #00ff41;
  color: #00ff41;
}

.overlay-body {
  font-size: clamp(8px, 1vw, 10px);
  color: rgba(255, 255, 255, 0.8);
  line-height: 2;
  font-family: 'Courier New', monospace;
}

.overlay-link a {
  text-decoration: none;
  transition: opacity 0.2s;
}

.overlay-link a:hover {
  opacity: 0.8;
}

.overlay-hint {
  margin-top: 1rem;
  color: rgba(255, 255, 255, 0.65);
  font-size: clamp(7px, 0.9vw, 9px);
  font-family: 'Press Start 2P', monospace;
}

/* Door overlay */
#door-overlay {
  position: fixed;
  inset: 0;
  z-index: 30;
  background: #0c0a08;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Press Start 2P', 'Courier New', monospace;
  transition: opacity 0.5s;
}

#door-overlay .door-label {
  font-size: clamp(14px, 2vw, 20px);
  color: #ff4444;
  text-transform: uppercase;
  letter-spacing: 0.3em;
  text-shadow: 0 0 20px rgba(255, 68, 68, 0.5);
  border: 2px solid #ff4444;
  padding: 1rem 2rem;
  animation: doorPulse 1.5s ease-in-out infinite;
}

@keyframes doorPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

/* BMC button — top-left, mirrors curator top-right */
#bmc-btn {
  position: fixed;
  top: 1rem;
  left: 1rem;
  z-index: 25;
  background: rgba(12, 10, 8, 0.8);
  border: 1px solid rgba(255, 187, 36, 0.4);
  color: #fbbf24;
  font-family: 'Press Start 2P', 'Courier New', monospace;
  font-size: 9px;
  padding: 0.4rem 0.6rem;
  cursor: pointer;
  display: none;
  text-decoration: none;
  text-shadow: 0 0 6px rgba(255, 187, 36, 0.3);
  transition: border-color 0.2s, background 0.2s;
}

#bmc-btn:hover {
  border-color: #fbbf24;
  background: rgba(255, 187, 36, 0.1);
}

#bmc-btn:focus-visible {
  outline: 2px solid #fbbf24;
  outline-offset: 2px;
}

/* CRT toggle button */
#crt-toggle {
  position: fixed;
  top: 1rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 25;
  background: rgba(12, 10, 8, 0.8);
  border: 1px solid rgba(0, 255, 65, 0.3);
  color: #00ff41;
  font-family: 'Press Start 2P', monospace;
  font-size: 9px;
  padding: 0.4rem 0.6rem;
  cursor: pointer;
  display: none;
  transition: border-color 0.2s;
}

#crt-toggle:hover {
  border-color: #00ff41;
}

#crt-toggle:focus-visible {
  outline: 2px solid #00ff41;
  outline-offset: 2px;
}

/* Portal flash (floor — phosphor silver) */
#portal-flash {
  position: fixed;
  inset: 0;
  background: radial-gradient(circle, rgba(196, 204, 212, 0.95), rgba(196, 204, 212, 0.2));
  z-index: 100;
  opacity: 0;
  display: none;
  pointer-events: none;
  transition: opacity 0.6s ease-in-out;
}

/* Portal flash (ceiling — warm amber) */
#portal-sky-flash {
  position: fixed;
  inset: 0;
  background: radial-gradient(circle, rgba(255, 160, 64, 0.95), rgba(255, 160, 64, 0.2));
  z-index: 100;
  opacity: 0;
  display: none;
  pointer-events: none;
  transition: opacity 0.6s ease-in-out;
}

/* Exhibit flash (color set by JS) */
#exhibit-flash {
  position: fixed;
  inset: 0;
  z-index: 100;
  opacity: 0;
  display: none;
  pointer-events: none;
  transition: opacity 0.6s ease-in-out;
}

/* Mobile fallback */
#mobile-fallback {
  display: none;
  min-height: 100vh;
  background: #0c0a08;
  color: rgba(255, 255, 255, 0.92);
  font-family: 'Press Start 2P', 'Courier New', monospace;
  padding: 2rem;
  overflow-y: auto;
}

#mobile-fallback::after {
  content: '';
  position: fixed;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    rgba(0, 255, 65, 0.02) 0px,
    rgba(0, 255, 65, 0.02) 1px,
    transparent 1px,
    transparent 3px
  );
  pointer-events: none;
}

.mobile-header {
  text-align: center;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid rgba(0, 255, 65, 0.3);
}

.mobile-header h1 {
  font-size: clamp(14px, 3vw, 18px);
  color: #00ff41;
  margin-bottom: 0.5rem;
}

.mobile-header p {
  font-size: clamp(8px, 1.8vw, 10px);
  color: rgba(255, 255, 255, 0.5);
  font-family: 'Courier New', monospace;
}

.mobile-card {
  background: rgba(22, 20, 16, 0.6);
  border: 1px solid rgba(0, 255, 65, 0.15);
  padding: 1.2rem;
  margin-bottom: 1rem;
  text-decoration: none;
  display: block;
  transition: border-color 0.2s;
  position: relative;
}

.mobile-card:hover {
  border-color: rgba(0, 255, 65, 0.5);
}

.mobile-card-name {
  font-size: clamp(10px, 2vw, 12px);
  margin-bottom: 0.4rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.mobile-card-desc {
  font-size: clamp(8px, 1.6vw, 10px);
  color: rgba(255, 255, 255, 0.6);
  line-height: 1.8;
  font-family: 'Courier New', monospace;
}

.mobile-card-action {
  margin-top: 0.5rem;
  font-size: clamp(7px, 1.4vw, 9px);
  opacity: 0.6;
}

/* On mobile (tour mode), move BMC to bottom-left */
@media (pointer: coarse) {
  #bmc-btn {
    top: auto;
    bottom: 1rem;
    left: 1rem;
    right: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@media (prefers-contrast: more) {
  .info-desc { color: rgba(255, 255, 255, 1); }
  .overlay-hint { color: rgba(255, 255, 255, 0.8); }
  #door-overlay .door-label { border-width: 3px; }
}