:root {
  --bg: #07080b;
  --panel: rgba(14, 16, 22, 0.72);
  --edge: rgba(255, 255, 255, 0.1);
  --txt: #e8ecf4;
  --dim: #97a0b3;
  --accent: #7cc7ff;
}
* {
  box-sizing: border-box;
}
html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--txt);
  font:
    13px/1.45 ui-sans-serif,
    system-ui,
    -apple-system,
    'Segoe UI',
    Roboto,
    sans-serif;
  -webkit-font-smoothing: antialiased;
}
#stage {
  position: fixed;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none;
  cursor: grab;
}
#stage.dragging {
  cursor: grabbing;
}

.panel {
  position: fixed;
  z-index: 10;
  background: var(--panel);
  border: 1px solid var(--edge);
  border-radius: 12px;
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.45);
}
#hud {
  top: 14px;
  left: 14px;
  width: 268px;
  padding: 12px 14px 14px;
}
#hud h1 {
  margin: 0 0 2px;
  font-size: 13px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
#hud .sub {
  color: var(--dim);
  font-size: 11px;
  margin-bottom: 10px;
}
#hud.collapsed .body {
  display: none;
}
.row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 7px 0;
}
.row label {
  flex: 0 0 78px;
  color: var(--dim);
  font-size: 11px;
}
.row .val {
  flex: 0 0 46px;
  text-align: right;
  color: var(--dim);
  font-size: 10.5px;
  font-variant-numeric: tabular-nums;
}
select,
input[type='range'],
button {
  font: inherit;
  color: var(--txt);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--edge);
  border-radius: 8px;
  padding: 4px 7px;
  min-width: 0;
}
select,
input[type='range'] {
  flex: 1 1 auto;
}
input[type='range'] {
  padding: 0;
  height: 22px;
  accent-color: var(--accent);
}
button {
  cursor: pointer;
}
button:hover {
  background: rgba(124, 199, 255, 0.16);
  border-color: rgba(124, 199, 255, 0.4);
}
.btns {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}
.btns button {
  flex: 1 1 auto;
}
.hint {
  color: var(--dim);
  font-size: 10.5px;
  margin-top: 10px;
  line-height: 1.5;
}
kbd {
  background: rgba(255, 255, 255, 0.09);
  border: 1px solid var(--edge);
  border-radius: 4px;
  padding: 0 4px;
  font-size: 10px;
}

#stats {
  bottom: 14px;
  left: 14px;
  padding: 9px 12px;
  font-variant-numeric: tabular-nums;
  font-size: 11.5px;
}
#stats b {
  color: var(--accent);
  font-weight: 600;
}
#stats span {
  color: var(--dim);
}

#depth {
  position: fixed;
  right: 16px;
  bottom: 16px;
  z-index: 10;
  width: 78px;
  height: 78px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  text-align: center;
  background: conic-gradient(var(--accent) 0turn, rgba(255, 255, 255, 0.07) 0turn);
  border: 1px solid var(--edge);
  box-shadow: 0 8px 26px rgba(0, 0, 0, 0.4);
}
#depth .inner {
  width: 62px;
  height: 62px;
  border-radius: 50%;
  background: rgba(9, 11, 16, 0.9);
  display: grid;
  place-items: center;
  line-height: 1.1;
}
#depth .n {
  font-size: 20px;
  font-weight: 600;
}
#depth .l {
  font-size: 9px;
  letter-spacing: 0.12em;
  color: var(--dim);
  text-transform: uppercase;
}

#toast {
  position: fixed;
  left: 50%;
  bottom: 26px;
  transform: translateX(-50%) translateY(10px);
  z-index: 20;
  padding: 8px 14px;
  border-radius: 10px;
  background: rgba(20, 24, 32, 0.92);
  border: 1px solid var(--edge);
  opacity: 0;
  transition:
    opacity 0.25s,
    transform 0.25s;
  pointer-events: none;
  font-size: 12px;
}
#toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

#boot {
  position: fixed;
  inset: 0;
  z-index: 30;
  display: grid;
  place-items: center;
  background: radial-gradient(circle at 50% 40%, #131824, #05060a 70%);
  transition: opacity 0.4s;
  text-align: center;
  padding: 24px;
}
#boot.hide {
  opacity: 0;
  pointer-events: none;
}
#boot .card {
  max-width: 560px;
}
#boot h2 {
  margin: 0 0 6px;
  font-size: 19px;
  font-weight: 600;
}
#boot p {
  color: var(--dim);
  margin: 6px 0;
  font-size: 12.5px;
}
#boot code {
  display: inline-block;
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid var(--edge);
  padding: 3px 8px;
  border-radius: 6px;
  font-size: 11.5px;
}
#bar {
  height: 3px;
  width: 260px;
  margin: 16px auto 4px;
  background: rgba(255, 255, 255, 0.09);
  border-radius: 3px;
  overflow: hidden;
}
#bar > i {
  display: block;
  height: 100%;
  width: 0%;
  background: var(--accent);
  transition: width 0.2s;
}
.file-row {
  margin-top: 14px;
  display: flex;
  gap: 8px;
  justify-content: center;
  flex-wrap: wrap;
}
input[type='file'] {
  display: none;
}
.fake-btn {
  cursor: pointer;
  padding: 7px 12px;
  border-radius: 9px;
  border: 1px solid rgba(124, 199, 255, 0.45);
  background: rgba(124, 199, 255, 0.13);
  font-size: 12px;
}
@media (max-width: 620px) {
  #hud {
    width: calc(100vw - 28px);
  }
  #depth {
    width: 62px;
    height: 62px;
  }
  #depth .inner {
    width: 48px;
    height: 48px;
  }
  #depth .n {
    font-size: 16px;
  }
}