:root {
  --bg: oklch(3.5% 0 0);
  --ink: oklch(94% 0.004 85);
  --muted: oklch(72% 0.01 80);
  --faint: oklch(58% 0.008 75);
  --ember: oklch(66% 0.19 35);
  --hot: oklch(80% 0.13 78);
  --line: oklch(100% 0 0 / 9%);
  --panel: oklch(12% 0.006 70 / 85%);
  --mono: "IBM Plex Mono", ui-monospace, monospace;
  --disp: "Space Grotesk", sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body { height: 100%; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.5;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--ember); color: #000; }

button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }

:focus-visible { outline: 1px solid var(--ember); outline-offset: 2px; border-radius: 2px; }

#stage {
  position: fixed;
  inset: 0;
  cursor: grab;
  touch-action: none;
}
#stage.dragging { cursor: grabbing; }
#stage canvas { display: block; }

#hud { position: fixed; inset: 0; pointer-events: none; z-index: 10; }
#hud > * { pointer-events: auto; }

body.hud-hidden #hud, body.hud-hidden #toast, body.hud-hidden #infallBanner { opacity: 0; pointer-events: none !important; }
#hud, #toast, #infallBanner { transition: opacity .35s ease-out; }

.brand { position: absolute; top: 20px; left: 22px; user-select: none; }
.brand h1 {
  font-family: var(--disp);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: 0.34em;
  color: var(--ink);
}
.brand .sub { color: var(--muted); font-size: 11px; margin-top: 2px; }
.brand .hints { color: var(--faint); font-size: 10px; margin-top: 10px; }
.brand .hints b { color: var(--muted); font-weight: 500; }

#panelToggle {
  position: absolute;
  top: 18px;
  right: 18px;
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  z-index: 21;
  transition: color .15s ease-out, border-color .15s ease-out;
}
#panelToggle:hover, #panelToggle[aria-expanded="true"] { color: var(--ink); border-color: oklch(100% 0 0 / 22%); }

#panel {
  position: absolute;
  top: 62px;
  right: 18px;
  width: 275px;
  max-height: calc(100% - 150px);
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: oklch(100% 0 0 / 14%) transparent;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  backdrop-filter: blur(16px) saturate(1.15);
  -webkit-backdrop-filter: blur(16px) saturate(1.15);
  padding: 6px 16px 14px;
  transition: transform .3s cubic-bezier(.22, 1, .36, 1), opacity .25s ease-out;
}
#panel:not(.open) { transform: translateX(calc(100% + 26px)); opacity: 0; pointer-events: none; }

#panel section + section { border-top: 1px solid var(--line); margin-top: 6px; padding-top: 12px; }
#panel h2 {
  font-family: var(--disp);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--hot);
  margin: 8px 0 10px;
}

.row { display: block; margin-bottom: 11px; }
.row > span {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  color: var(--muted);
  font-size: 11px;
  margin-bottom: 5px;
}
.row output { color: var(--ink); font-variant-numeric: tabular-nums; }

.styled-select {
  width: 100%;
  padding: 6px 10px;
  background: oklch(8% 0.005 60 / 90%);
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 11px;
  outline: none;
  cursor: pointer;
  transition: border-color .15s ease-out;
}
.styled-select:hover, .styled-select:focus {
  border-color: var(--ember);
}

input[type="range"] {
  --fill: 50%;
  appearance: none;
  -webkit-appearance: none;
  width: 100%;
  height: 18px;
  background: transparent;
  cursor: ew-resize;
}
input[type="range"]::-webkit-slider-runnable-track {
  height: 2px;
  border-radius: 1px;
  background: linear-gradient(to right, var(--ember) var(--fill), oklch(100% 0 0 / 14%) var(--fill));
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--bg);
  border: 1.5px solid var(--ember);
  margin-top: -4.5px;
  transition: transform .12s ease-out;
}
input[type="range"]:hover::-webkit-slider-thumb { transform: scale(1.25); }
input[type="range"]::-moz-range-track {
  height: 2px;
  border-radius: 1px;
  background: oklch(100% 0 0 / 14%);
}
input[type="range"]::-moz-range-progress { height: 2px; border-radius: 1px; background: var(--ember); }
input[type="range"]::-moz-range-thumb {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--bg);
  border: 1.5px solid var(--ember);
}

.switch {
  display: flex;
  align-items: center;
  gap: 9px;
  color: var(--muted);
  font-size: 11px;
  margin: 9px 0;
  cursor: pointer;
  user-select: none;
}
.switch input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.switch i {
  flex: none;
  width: 24px;
  height: 13px;
  border-radius: 7px;
  border: 1px solid oklch(100% 0 0 / 22%);
  position: relative;
  transition: background .15s ease-out, border-color .15s ease-out;
}
.switch i::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--muted);
  transition: transform .18s cubic-bezier(.22, 1, .36, 1), background .15s ease-out;
}
.switch input:checked + i { background: oklch(66% 0.19 35 / 30%); border-color: var(--ember); }
.switch input:checked + i::after { transform: translateX(11px); background: var(--ember); }
.switch input:focus-visible + i { outline: 1px solid var(--ember); outline-offset: 2px; }
.switch:hover { color: var(--ink); }

.seg { border: none; display: flex; gap: 4px; margin: 2px 0 12px; }
.seg legend { color: var(--muted); font-size: 11px; margin-bottom: 5px; }
.seg label {
  flex: 1;
  text-align: center;
  font-size: 10px;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 3px 0;
  cursor: pointer;
  transition: all .13s ease-out;
}
.seg label:hover { color: var(--ink); border-color: oklch(100% 0 0 / 22%); }
.seg input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.seg label:has(input:checked) { background: var(--ember); border-color: var(--ember); color: #000; }
.seg label:has(input:focus-visible) { outline: 1px solid var(--ember); outline-offset: 2px; }

.telemetry {
  position: absolute;
  left: 22px;
  bottom: 20px;
  display: grid;
  grid-template-columns: auto auto;
  gap: 3px 18px;
  font-size: 10.5px;
  user-select: none;
}
.telemetry div { display: contents; }
.telemetry s { text-decoration: none; color: var(--faint); letter-spacing: 0.06em; }
.telemetry b { font-weight: 500; color: var(--ink); font-variant-numeric: tabular-nums; min-width: 72px; }
.telemetry b.warm { color: var(--hot); }
.telemetry b.hot { color: var(--hot); }
.telemetry b.danger { color: oklch(65% 0.24 25); font-weight: 700; }
.telemetry b.danger.pulse { animation: text-pulse 0.8s infinite alternate; }
@keyframes text-pulse { from { opacity: 0.4; } to { opacity: 1; } }

.dock {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}
.presets { display: flex; gap: 6px; }
.presets button {
  font-size: 10px;
  letter-spacing: 0.05em;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px 12px;
  background: oklch(12% 0.006 70 / 55%);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: all .14s ease-out;
}
.presets button:hover { color: var(--ink); border-color: oklch(100% 0 0 / 25%); }

.dock-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

.plunge-btn {
  font-family: var(--disp);
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #fff;
  background: linear-gradient(135deg, oklch(65% 0.22 35), oklch(58% 0.24 25));
  border: 1px solid oklch(75% 0.20 40 / 70%);
  border-radius: 999px;
  padding: 9px 24px;
  box-shadow: 0 0 24px oklch(65% 0.22 35 / 35%), inset 0 1px 0 oklch(100% 0 0 / 25%);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: all .18s cubic-bezier(.22, 1, .36, 1);
}
.plunge-btn:hover {
  transform: translateY(-1px) scale(1.02);
  box-shadow: 0 0 32px oklch(65% 0.22 35 / 55%), inset 0 1px 0 oklch(100% 0 0 / 40%);
  border-color: #fff;
}
.plunge-btn:active { transform: scale(0.97); }

.plunge-btn.active {
  background: linear-gradient(135deg, oklch(55% 0.22 15), oklch(45% 0.24 10));
  border-color: oklch(70% 0.25 20);
  box-shadow: 0 0 28px oklch(60% 0.25 15 / 50%);
  animation: pulse-danger 1.4s infinite ease-in-out;
}
@keyframes pulse-danger {
  0%, 100% { box-shadow: 0 0 20px oklch(60% 0.25 15 / 40%); }
  50% { box-shadow: 0 0 36px oklch(60% 0.25 15 / 80%); }
}

.reset-btn {
  font-family: var(--disp);
  font-weight: 600;
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink);
  background: oklch(14% 0.01 60 / 70%);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 9px 18px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: all .16s ease-out;
}
.reset-btn:hover {
  background: oklch(22% 0.02 60 / 90%);
  border-color: oklch(100% 0 0 / 30%);
  transform: translateY(-1px);
}
.reset-btn:active { transform: scale(0.97); }

.feed-btn {
  font-family: var(--disp);
  font-weight: 500;
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 9px 18px;
  background: oklch(12% 0.006 70 / 60%);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: all .16s ease-out;
}
.feed-btn:hover { color: var(--ink); border-color: oklch(100% 0 0 / 25%); background: oklch(16% 0.01 70 / 80%); }

.infall-actions {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 8px;
}
.action-btn {
  width: 100%;
  font-family: var(--disp);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.06em;
  padding: 7px 12px;
  border-radius: 6px;
  text-align: center;
  transition: all .14s ease-out;
}
.action-btn.plunge {
  background: oklch(65% 0.22 35 / 20%);
  border: 1px solid oklch(65% 0.22 35 / 50%);
  color: var(--ember);
}
.action-btn.plunge:hover {
  background: var(--ember);
  color: #000;
}
.action-btn.abort {
  background: oklch(55% 0.22 15 / 25%);
  border: 1px solid oklch(65% 0.22 15 / 60%);
  color: oklch(80% 0.2 25);
}
.action-btn.abort:hover {
  background: oklch(60% 0.25 20);
  color: #fff;
}
.action-btn.reset {
  background: oklch(18% 0.01 60 / 50%);
  border: 1px solid var(--line);
  color: var(--muted);
}
.action-btn.reset:hover {
  background: oklch(24% 0.01 60 / 80%);
  color: var(--ink);
  border-color: oklch(100% 0 0 / 25%);
}
.action-btn.secondary {
  background: transparent;
  border: 1px solid var(--line);
  color: var(--faint);
  font-size: 10px;
}
.action-btn.secondary:hover {
  color: var(--muted);
  border-color: oklch(100% 0 0 / 20%);
}

.infall-banner {
  position: fixed;
  top: 72px;
  left: 50%;
  transform: translateX(-50%) translateY(-10px);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  padding: 10px 24px;
  max-width: min(520px, calc(100vw - 32px));
  text-align: center;
  background: oklch(14% 0.03 25 / 92%);
  border: 1px solid oklch(65% 0.22 35 / 60%);
  border-radius: 8px;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 12px 36px rgba(0,0,0,0.6), 0 0 24px oklch(65% 0.22 35 / 30%);
  z-index: 35;
  opacity: 0;
  pointer-events: none;
  transition: opacity .3s cubic-bezier(.22, 1, .36, 1), transform .3s cubic-bezier(.22, 1, .36, 1);
}
.infall-banner.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}
.infall-title {
  font-family: var(--disp);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--hot);
  text-transform: uppercase;
}
.infall-desc {
  font-size: 10.5px;
  color: var(--muted);
  letter-spacing: 0.03em;
  line-height: 1.4;
}

#toast {
  position: fixed;
  bottom: 108px;
  left: 50%;
  transform: translateX(-50%) translateY(6px);
  font-size: 11px;
  color: var(--ink);
  background: oklch(16% 0.01 60 / 88%);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 6px 14px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s ease-out, transform .25s ease-out;
  z-index: 30;
}
#toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

#loader {
  position: fixed;
  inset: 0;
  background: var(--bg);
  display: grid;
  place-items: center;
  z-index: 40;
  transition: opacity .7s ease-out;
}
#loader.done { opacity: 0; pointer-events: none; }
#loader span { color: var(--faint); font-size: 11px; letter-spacing: 0.28em; text-transform: uppercase; animation: pulse 1.6s ease-in-out infinite; }
@keyframes pulse { 50% { opacity: 0.35; } }

#fail {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  background: var(--bg);
  z-index: 50;
  text-align: center;
  padding: 24px;
}
#fail[hidden] { display: none; }
#fail h2 { font-family: var(--disp); font-size: 17px; margin-bottom: 10px; }
#fail p { color: var(--muted); max-width: 46ch; line-height: 1.7; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; }
}

@media (max-width: 720px) {
  .brand { top: 14px; left: 16px; }
  .brand h1 { font-size: 13px; }
  .brand .hints { display: none; }
  #panelToggle { top: 12px; right: 12px; }
  #panel { top: 54px; right: 12px; width: min(280px, calc(100vw - 24px)); max-height: calc(100% - 190px); }
  .telemetry { left: 16px; bottom: 104px; grid-template-columns: auto; gap: 2px; }
  .telemetry div:nth-child(even) { display: none; }
  .dock { bottom: 14px; width: calc(100% - 24px); }
  .presets { flex-wrap: wrap; justify-content: center; }
  .dock-actions { flex-wrap: wrap; justify-content: center; }
  #feedBtn { padding: 9px 16px; }
  #toast { bottom: 140px; width: max-content; max-width: 90vw; }
}