:root {
  --accent: #ffb45a;
  --ink: rgba(236, 234, 245, 0.92);
  --dim: rgba(236, 234, 245, 0.58);
  --glass: rgba(10, 10, 18, 0.42);
  color-scheme: dark;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  background: #06060b;
  color: var(--ink);
  font: 13px/1.45 ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
}

#stage {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
  cursor: crosshair;
}

#hud {
  position: fixed;
  inset: 0;
  pointer-events: none;
  padding: max(20px, env(safe-area-inset-top)) max(22px, env(safe-area-inset-right)) max(18px, env(safe-area-inset-bottom)) max(22px, env(safe-area-inset-left));
  display: grid;
  grid-template-rows: auto 1fr auto auto auto;
  gap: 10px;
  transition: opacity 0.8s ease;
}
#hud.idle { opacity: 0.32; }
#hud.idle:hover, #hud.idle:focus-within { opacity: 1; }
#hud.hidden { opacity: 0; visibility: hidden; }

.title h1 {
  margin: 0;
  font-weight: 300;
  font-size: clamp(22px, 3.2vw, 34px);
  letter-spacing: 0.42em;
  text-transform: uppercase;
  text-shadow: 0 0 24px rgba(255, 255, 255, 0.25);
  text-shadow: 0 0 24px color-mix(in srgb, var(--accent) 60%, transparent);
}
.sub { margin: 2px 0 0; color: var(--dim); letter-spacing: 0.04em; font-variant-numeric: tabular-nums; }
#preset-name { color: var(--accent); font-weight: 600; }

.presets, .actions {
  grid-row: 3;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  pointer-events: auto;
  align-self: end;
}
.actions { grid-row: 4; }

button {
  font: inherit;
  color: var(--ink);
  background: var(--glass);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 999px;
  padding: 6px 13px;
  min-height: 32px;
  cursor: pointer;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: border-color 0.2s, background 0.2s;
}
button:hover { border-color: rgba(255, 255, 255, 0.4); }
button[aria-pressed="true"] { border-color: var(--accent); color: #fff; box-shadow: 0 0 12px -2px var(--accent); }
button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.help {
  grid-row: 5;
  margin: 4px 0 0;
  color: var(--dim);
  max-width: 70ch;
}
.help b { color: var(--ink); font-weight: 600; }
kbd {
  font: 11px ui-monospace, SFMono-Regular, Menlo, monospace;
  padding: 1px 5px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 4px;
  color: var(--ink);
}

.noscript { position: fixed; inset: 0; display: grid; place-items: center; margin: 0; }

@media (max-width: 600px) {
  .help { display: none; }
  button { padding: 5px 10px; }
}

@media (prefers-reduced-motion: reduce) {
  #hud, button { transition: none; }
}

/* soft scrims keep HUD text legible over bright trails without boxing it in */
#hud::before, #hud::after {
  content: "";
  position: absolute;
  left: 0; right: 0;
  z-index: -1;
  pointer-events: none;
}
#hud::before { top: 0; height: 120px; background: linear-gradient(rgba(4, 4, 8, 0.55), transparent); }
#hud::after { bottom: 0; height: 190px; background: linear-gradient(transparent, rgba(4, 4, 8, 0.6)); }