/* Darkscreen — everything here is explicit; nothing relies on UA defaults. */
:root {
  color-scheme: dark only;
  --void: rgb(4 4 4);
  --light: #ff2b20;
  --light-glow: rgb(255 43 32 / .45);
  --light-rest: .5;
  --panel: #0b0b0b;
  --panel-line: #2a2a2a;
  --ink: #c9c9c9;
  --ink-dim: #9a9a9a;
  --focus: #ffffff;
}
*, *::before, *::after { box-sizing: border-box; }
html, body {
  margin: 0; height: 100%; overflow: hidden;
  background-color: var(--void); color: var(--ink);
  font: 15px/1.4 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-text-size-adjust: 100%; overscroll-behavior: none;
  -webkit-tap-highlight-color: transparent;
}
body { min-height: 100vh; min-height: 100dvh; }
html.idle body { cursor: none; }
.void { position: fixed; inset: 0; background-color: var(--void); }

/* The red light: pure CSS, so image-inverting tools have nothing to invert. */
.light {
  position: fixed; z-index: 2;
  right: max(6px, env(safe-area-inset-right)); bottom: max(6px, env(safe-area-inset-bottom));
  width: 44px; height: 44px; padding: 0; border: 0; border-radius: 50%;
  background: transparent; cursor: pointer; display: grid; place-items: center;
  forced-color-adjust: none;
}
.light::before {
  content: ""; width: 7px; height: 7px; border-radius: 50%;
  background-color: var(--light); box-shadow: 0 0 6px 1px var(--light-glow);
  opacity: var(--light-rest); transition: opacity .6s ease, transform .3s ease;
  animation: breathe 6s ease-in-out infinite; forced-color-adjust: none;
}
html.awake .light::before, .light:hover::before, .light:focus-visible::before { opacity: 1; transform: scale(1.25); }
.light:focus-visible { outline: 2px solid var(--focus); outline-offset: -4px; }
@keyframes breathe { 50% { opacity: calc(var(--light-rest) * .6); } }
html.awake .light::before { animation: none; }

.panel {
  position: fixed; z-index: 3; width: min(19rem, calc(100vw - 2rem));
  right: max(16px, env(safe-area-inset-right));
  bottom: calc(max(6px, env(safe-area-inset-bottom)) + 48px);
  padding: 1.1rem 1.1rem 1rem; border: 1px solid var(--panel-line); border-radius: 14px;
  background-color: var(--panel); color: var(--ink);
  opacity: 0; transform: translateY(6px); transition: opacity .25s ease, transform .25s ease;
}
.panel[hidden] { display: none; }
.panel.open { opacity: 1; transform: none; }
.panel h2 { margin: 0 0 .9rem; font-size: .8rem; font-weight: 600; letter-spacing: .12em; text-transform: uppercase; color: var(--ink-dim); }
.field { display: block; margin: 0 0 1rem; }
.field span { display: flex; justify-content: space-between; margin-bottom: .35rem; }
.field output { color: var(--ink-dim); font-variant-numeric: tabular-nums; }
input[type=range] { width: 100%; height: 32px; margin: 0; accent-color: #d8d8d8; background: transparent; }
input[type=range]:focus-visible, .btn:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
.row { display: flex; gap: .6rem; margin-top: .4rem; }
.btn {
  flex: 1; min-height: 44px; padding: .5rem .8rem; font: inherit; color: var(--ink);
  background-color: #151515; border: 1px solid var(--panel-line); border-radius: 10px; cursor: pointer;
}
.btn[hidden] { display: none; }
.btn:hover { background-color: #1e1e1e; }
.btn.primary { background-color: #1c1c1c; border-color: #3a3a3a; }

@media (prefers-reduced-motion: reduce) {
  .light::before { animation: none; transition: none; }
  .panel { transition: none; transform: none; }
}
@media (forced-colors: active) {
  .panel, .btn { border-color: CanvasText; }
}