/* ==========================================================================
   obelisk.css — Prototype 1: full-viewport 3D canvas + overlay HUD
   ========================================================================== */

html,
body {
  height: 100%;
  overflow: hidden;
  overscroll-behavior: none;
}

/* the 3D stage is always the cream "poster" look, so pin the HUD chips to a
   light palette regardless of the viewer's system theme */
.stage,
.hud {
  --fg: #241a30;
  --fg-muted: #6b6478;
  --bg-elevated: #fffdf8;
  --border: #e0d7c6;
  --shadow: 0 6px 20px rgba(60, 40, 70, 0.18);
  color-scheme: light;
}

.stage {
  position: fixed;
  inset: 0;
  background: radial-gradient(125% 125% at 50% 12%, #fbf7ee 0%, #ece2d0 72%);
}

.stage__canvas {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none; /* let OrbitControls own the gesture */
}

/* ---- overlay HUD --------------------------------------------------------- */
.hud {
  position: fixed;
  inset: 0;
  pointer-events: none; /* only children opt back in */
  padding: env(safe-area-inset-top) env(safe-area-inset-right)
    env(safe-area-inset-bottom) env(safe-area-inset-left);
}

.hud__topbar {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.15rem;
}

.hud__back {
  pointer-events: auto;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  text-decoration: none;
  color: var(--fg);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.4rem 0.8rem;
  font-size: 0.85rem;
  white-space: nowrap;
}

.hud__back:hover {
  border-color: var(--accent);
}

.hud__title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--fg-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.hud__about {
  pointer-events: auto;
  margin-left: auto;
  flex: none;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0.3rem;
  display: grid;
  place-items: center;
  border: none;
  border-radius: 8px;
  background: transparent;
  cursor: pointer;
  transition: transform 0.15s ease;
}

.hud__about img {
  width: 100%;
  height: 100%;
}

.hud__about:hover {
  transform: scale(1.08);
}

.hud__about:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.hud__controls {
  position: absolute;
  right: var(--hud-icon-inset-x);
  bottom: var(--hud-icon-inset-y);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.hud__controls .btn {
  pointer-events: auto;
  box-shadow: var(--shadow);
}

.hud__hint {
  position: absolute;
  left: 50%;
  bottom: 1.4rem;
  transform: translateX(-50%);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.45rem 0.9rem;
  font-size: 0.82rem;
  color: var(--fg-muted);
  box-shadow: var(--shadow);
  transition: opacity 0.4s ease;
  max-width: calc(100vw - 2rem);
  text-align: center;
}

.hud__hint[hidden] {
  display: block; /* keep layout, fade instead of pop */
  opacity: 0;
  pointer-events: none;
}

@media (max-width: 640px) {
  .hud__hint {
    bottom: 1rem;
    left: 0.9rem;
    right: calc(var(--hud-icon-inset-x) + 3.25rem); /* stop short of the control stack */
    transform: none;
    max-width: none;
  }
}

/* loading / error states */
.stage__status {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 2rem;
  text-align: center;
  color: var(--fg-muted);
  font-size: 0.95rem;
}

.stage__status[hidden] {
  display: none;
}