/* Interface layer for the flight simulator.
   The 3D scene is a full-bleed canvas; everything here is the readout, the
   controls hint and the two colour schemes. */

:root {
  --hud-bg: rgba(10, 14, 26, 0.62);
  --hud-border: rgba(178, 198, 235, 0.22);
  --hud-text: #e8eefc;
  --hud-dim: #9fb0d0;
  --hud-accent: #ffc07a;
  --hud-shadow: 0 6px 24px rgba(0, 0, 0, 0.45);
  --hud-radius: 12px;
  --hud-font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --hud-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

html[data-scheme="light"] {
  --hud-bg: rgba(244, 246, 252, 0.78);
  --hud-border: rgba(36, 52, 86, 0.22);
  --hud-text: #10182c;
  --hud-dim: #4a5a78;
  --hud-accent: #a3551c;
  --hud-shadow: 0 6px 20px rgba(20, 30, 55, 0.18);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: #05070f;
  color: var(--hud-text);
  font-family: var(--hud-font);
  overflow: hidden;
}

#scene {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  background: #05070f;
  touch-action: none;
}

#scene:focus-visible {
  outline: 3px solid var(--hud-accent);
  outline-offset: -3px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.hud {
  position: fixed;
  inset: 0;
  pointer-events: none;
  display: block;
}

.hud-panel {
  position: absolute;
  top: max(14px, env(safe-area-inset-top));
  right: max(14px, env(safe-area-inset-right));
  min-width: 190px;
  padding: 10px 14px 12px;
  background: var(--hud-bg);
  border: 1px solid var(--hud-border);
  border-radius: var(--hud-radius);
  box-shadow: var(--hud-shadow);
  backdrop-filter: blur(10px) saturate(120%);
  -webkit-backdrop-filter: blur(10px) saturate(120%);
}

.hud-stats {
  margin: 0;
  display: grid;
  gap: 4px;
}

.hud-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 18px;
}

.hud-row dt {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--hud-dim);
}

.hud-row dd {
  margin: 0;
  font-family: var(--hud-mono);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  color: var(--hud-text);
  text-align: right;
}

.hud-row dd#hud-route {
  font-family: var(--hud-font);
  font-weight: 600;
  color: var(--hud-accent);
  max-width: 150px;
}

.hud-hint {
  position: absolute;
  left: max(14px, env(safe-area-inset-left));
  bottom: max(14px, env(safe-area-inset-bottom));
  margin: 0;
  padding: 8px 13px;
  max-width: min(78vw, 520px);
  font-size: 12.5px;
  line-height: 1.35;
  color: var(--hud-text);
  background: var(--hud-bg);
  border: 1px solid var(--hud-border);
  border-radius: 999px;
  box-shadow: var(--hud-shadow);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 520ms ease, transform 520ms ease;
}

.hud-hint.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.hud-hint.is-hidden {
  opacity: 0;
  transform: translateY(6px);
}

.fallback {
  position: fixed;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  max-width: 34rem;
  margin: 0;
  padding: 18px 22px;
  font-size: 15px;
  line-height: 1.5;
  text-align: center;
  color: var(--hud-text);
  background: var(--hud-bg);
  border: 1px solid var(--hud-border);
  border-radius: var(--hud-radius);
}

body.no-webgl .hud {
  display: none;
}

/* Visitors who ask for less motion get no interface transitions. */
@media (prefers-reduced-motion: reduce) {
  .hud-hint {
    transition-duration: 1ms;
    transform: none;
  }
}

@media (max-width: 560px) {
  .hud-panel {
    min-width: 0;
    padding: 8px 11px 10px;
  }
  .hud-row dd {
    font-size: 12px;
  }
  .hud-hint {
    font-size: 11.5px;
    border-radius: 14px;
  }
}