:root {
  --bg-top: #0a0a12;
  --bg-bot: #1a1428;
  --fg: #e6e6f0;
  --mute: #8a8aa0;
  --accent: #c5a0ff;
  --wine: #8b2d4b;
  --silver: #c0c4cc;
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bot: env(safe-area-inset-bottom, 0px);
  --safe-left: env(safe-area-inset-left, 0px);
  --safe-right: env(safe-area-inset-right, 0px);
}

* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0; width: 100%; height: 100%;
  background: radial-gradient(ellipse at 50% 20%, var(--bg-bot), var(--bg-top) 70%);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", sans-serif;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

#stage { position: fixed; inset: 0; }
#stage canvas { display: block; width: 100% !important; height: 100% !important; }

.overlay {
  position: fixed; inset: 0;
  display: flex; align-items: center; justify-content: center;
  background: radial-gradient(ellipse at center, rgba(30,20,50,0.9), rgba(10,10,18,0.98));
  z-index: 100; transition: opacity 0.6s;
}
.overlay.hidden { opacity: 0; pointer-events: none; }
.loader-inner { text-align: center; }
.loader-glyph { font-size: 48px; margin-bottom: 12px; animation: pulse 2s infinite ease-in-out; }
.loader-title { font-size: 28px; letter-spacing: 0.2em; margin-bottom: 4px; }
.loader-sub { color: var(--mute); font-size: 13px; margin-bottom: 16px; letter-spacing: 0.05em; }
.loader-bar { width: 200px; height: 3px; background: rgba(255,255,255,0.1); border-radius: 2px; overflow: hidden; margin: 0 auto; }
.loader-fill { width: 0%; height: 100%; background: linear-gradient(90deg, var(--accent), var(--wine)); transition: width 0.3s; }

@keyframes pulse { 0%,100%{opacity:0.7;transform:scale(1);} 50%{opacity:1;transform:scale(1.05);} }

#hud {
  position: fixed; inset: 0;
  pointer-events: none;
  padding-top: var(--safe-top);
  padding-bottom: var(--safe-bot);
  padding-left: var(--safe-left);
  padding-right: var(--safe-right);
  z-index: 10;
}

.hud-top {
  position: absolute; top: calc(var(--safe-top) + 10px); left: calc(var(--safe-left) + 14px);
  right: calc(var(--safe-right) + 14px);
  display: flex; justify-content: space-between; align-items: center;
  pointer-events: none;
}
.brand { display: flex; align-items: center; gap: 8px; font-weight: 300; letter-spacing: 0.1em; }
.brand-mark { font-size: 16px; }
.brand-name { font-size: 14px; }
.brand-ver { font-size: 10px; color: var(--mute); letter-spacing: 0.2em; }
.stat { font-size: 11px; color: var(--mute); font-family: ui-monospace, monospace; }

.hud-side {
  position: absolute; top: calc(var(--safe-top) + 50px);
  right: calc(var(--safe-right) + 10px);
  width: 280px;
  max-height: calc(100vh - var(--safe-top) - var(--safe-bot) - 80px);
  background: rgba(15,12,24,0.72); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 14px;
  pointer-events: auto;
  overflow: hidden;
  transition: transform 0.3s ease;
}
.hud-side.collapsed .panel-body { display: none; }
.hud-side.collapsed { width: 44px; }
.panel-toggle {
  position: absolute; top: 8px; right: 8px;
  width: 28px; height: 28px;
  background: transparent; border: none; color: var(--fg);
  font-size: 16px; cursor: pointer; z-index: 2;
}
.panel-body {
  padding: 12px 14px 14px; padding-top: 44px;
  overflow-y: auto; max-height: calc(100vh - var(--safe-top) - var(--safe-bot) - 80px);
  scrollbar-width: thin; scrollbar-color: rgba(255,255,255,0.2) transparent;
}
.panel-body::-webkit-scrollbar { width: 6px; }
.panel-body::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.2); border-radius: 3px; }

.hud-side section { margin-bottom: 14px; }
.hud-side h3 { margin: 0 0 6px; font-size: 11px; letter-spacing: 0.15em; color: var(--mute); font-weight: 500; text-transform: uppercase; }
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 4px; }
.row { display: flex; gap: 6px; margin-top: 4px; flex-wrap: wrap; }
.row label { font-size: 11px; color: var(--mute); display: flex; align-items: center; gap: 6px; width: 100%; }
.row label input[type="range"] { flex: 1; accent-color: var(--accent); }

button, .btn {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  color: var(--fg);
  padding: 6px 8px;
  font-size: 11px;
  border-radius: 7px;
  cursor: pointer;
  font-family: inherit;
  letter-spacing: 0.03em;
  transition: background 0.15s, border-color 0.15s;
}
button:hover, .btn:hover { background: rgba(197,160,255,0.12); border-color: rgba(197,160,255,0.3); }
button.active { background: rgba(197,160,255,0.2); border-color: var(--accent); color: var(--accent); }

#cam { display: none; position: absolute; bottom: 10px; right: 10px; width: 80px; height: 60px; border-radius: 6px; }
#cam.active { display: block; }
#cam-overlay { display: none; }

.hud-foot {
  position: absolute; bottom: calc(var(--safe-bot) + 14px);
  left: calc(var(--safe-left) + 14px);
  right: calc(var(--safe-right) + 14px);
  text-align: center;
  font-size: 12px; color: var(--mute);
  pointer-events: none;
}

@media (max-width: 640px) {
  .hud-side { width: calc(100vw - var(--safe-left) - var(--safe-right) - 20px); top: auto; bottom: calc(var(--safe-bot) + 10px); max-height: 58vh; border-radius: 18px; }
  .hud-side .panel-body { padding: 10px 12px 12px; padding-top: 40px; max-height: 58vh; }
  .hud-foot { bottom: auto; top: calc(var(--safe-top) + 40px); }
  .hud-side.collapsed { width: 44px; height: 44px; max-height: 44px; bottom: calc(var(--safe-bot) + 14px); right: calc(var(--safe-right) + 14px); }
  button, .btn { padding: 10px 10px; font-size: 12px; min-height: 38px; }  /* bigger touch targets */
  .grid { grid-template-columns: repeat(3, 1fr); gap: 6px; }
  .row input[type="range"] { min-height: 30px; }
}

@media (orientation: landscape) and (max-width: 900px) and (max-height: 500px) {
  .hud-side { width: 260px; top: calc(var(--safe-top) + 10px); bottom: auto; right: calc(var(--safe-right) + 10px); max-height: calc(100vh - 40px); }
  .hud-foot { top: auto; bottom: calc(var(--safe-bot) + 10px); }
}

/* Prevent iOS pinch-zoom on UI */
.hud-side { touch-action: manipulation; }

.help-overlay {
  position: fixed; inset: 0;
  display: flex; align-items: center; justify-content: center;
  background: rgba(5, 4, 10, 0.78); backdrop-filter: blur(14px);
  z-index: 80; pointer-events: auto;
}
.help-overlay[hidden] { display: none; }
.help-inner {
  background: rgba(20, 16, 32, 0.96);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 16px;
  padding: 28px 32px;
  min-width: 260px; max-width: 90vw;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}
.help-inner h2 { margin: 0 0 14px; font-size: 16px; letter-spacing: 0.08em; font-weight: 400; }
.help-inner dl { display: grid; grid-template-columns: auto 1fr; gap: 8px 18px; margin: 0 0 18px; font-size: 13px; }
.help-inner dt { color: var(--accent); font-family: ui-monospace, monospace; }
.help-inner dd { margin: 0; color: var(--fg); }
.help-inner button { width: 100%; padding: 8px; }