:root {
  /* Surface — matches the SplatFPV brand assets' nominal dark background */
  --bg: #19110b;
  /* Chrome's H.264 decode renders that same #19110b background a few
     units darker (measured rgb(20,17,12) vs the nominal rgb(25,17,11)) —
     use this wherever a brand video sits directly against the page so
     there's no visible seam around the clip. */
  --bg-video: #14110c;
  --panel-bg: rgba(24, 17, 12, 0.90);
  --panel-bg-solid: #221a13;
  --panel-border: rgba(255, 255, 255, 0.10);
  --panel-border-strong: rgba(255, 255, 255, 0.18);
  --panel-hover: rgba(255, 255, 255, 0.05);

  /* OSD telemetry — kept neutral, like a real flight-controller overlay */
  --osd: #eef1f6;
  --osd-dim: #7b8290;
  --osd-faint: #454b56;

  /* Interactive chrome accent — the one color reserved for things you click */
  --accent: #ff9142;
  --accent-strong: #ffb066;
  --accent-dim: rgba(255, 145, 66, 0.14);
  --accent-border: rgba(255, 145, 66, 0.4);

  /* Secondary telemetry accent (gamepad live, horizon) */
  --tele: #4fd2ff;
  --tele-dim: rgba(79, 210, 255, 0.14);

  /* Status semantics only — not used as decoration elsewhere */
  --armed: #ff4d4d;
  --safe: #34d399;
  --warn: #ffc94d;

  --mono: "JetBrains Mono", ui-monospace, "SF Mono", "Cascadia Mono", Consolas, monospace;
  --sans: "Space Grotesk", system-ui, -apple-system, sans-serif;
  --radius: 12px;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.6);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  background: var(--bg);
  overflow: hidden;
  font-family: var(--mono);
  color: var(--osd);
  -webkit-user-select: none;
  user-select: none;
}

#glcanvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  outline: none;
}

.btn {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  background: rgba(255, 255, 255, 0.03);
  color: var(--osd);
  border: 1px solid var(--panel-border);
  border-radius: 6px;
  padding: 10px 16px;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s, transform 0.1s, color 0.15s;
}

.btn:hover { border-color: var(--panel-border-strong); background: rgba(255, 255, 255, 0.06); }
.btn:active { transform: translateY(1px); }
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #1a0f05;
  font-weight: 600;
}
.btn.primary:hover { background: var(--accent-strong); border-color: var(--accent-strong); }

.btn.ghost { background: transparent; }

.btn.subtle {
  background: transparent;
  border-color: transparent;
  color: var(--osd-dim);
  padding: 6px 10px;
}
.btn.subtle:hover { color: var(--osd); background: var(--panel-hover); }
.btn.subtle.active {
  color: var(--accent);
  background: var(--accent-dim);
  border-color: var(--accent-border);
}

.btn-icon {
  width: 32px;
  height: 32px;
  border: none;
  background: transparent;
  color: var(--osd-dim);
  font-size: 16px;
  cursor: pointer;
  border-radius: 6px;
  transition: background 0.15s, color 0.15s;
}
.btn-icon:hover { background: var(--panel-hover); color: var(--osd); }

.field { margin-bottom: 14px; }
.field label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--osd-dim);
  font-size: 11px;
  margin-bottom: 6px;
  letter-spacing: 0.01em;
}
.field label .val {
  color: var(--accent);
  font-variant-numeric: tabular-nums;
  font-weight: 500;
}

.field input[type="range"] {
  width: 100%;
  height: 3px;
  border-radius: 2px;
  background: var(--panel-border-strong);
  appearance: none;
  -webkit-appearance: none;
  outline: none;
  cursor: pointer;
}
.field input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  -webkit-appearance: none;
  width: 6px;
  height: 16px;
  border-radius: 2px;
  background: var(--accent);
  cursor: pointer;
  box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.4);
  transition: background 0.1s;
}
.field input[type="range"]:hover::-webkit-slider-thumb { background: var(--accent-strong); }
.field input[type="range"]::-moz-range-thumb {
  width: 6px;
  height: 16px;
  border: none;
  border-radius: 2px;
  background: var(--accent);
  cursor: pointer;
}
.field input[type="range"]:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

.field select {
  width: 100%;
  background: #100b07;
  border: 1px solid var(--panel-border);
  color: var(--osd);
  font-family: var(--mono);
  font-size: 11px;
  padding: 9px 10px;
  border-radius: 6px;
  outline: none;
  transition: border-color 0.15s;
}
.field select:focus { border-color: var(--accent-border); }

.field.checkbox-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 11px;
  color: var(--osd-dim);
}
.field.checkbox-row input {
  accent-color: var(--accent);
  width: 15px;
  height: 15px;
  cursor: pointer;
}

.field.color-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 11px;
  color: var(--osd-dim);
}
.field.color-row input[type="color"] {
  width: 40px;
  height: 24px;
  padding: 0;
  border: 1px solid var(--panel-border);
  border-radius: 6px;
  background: none;
  cursor: pointer;
}
.field.color-row input[type="color"]::-webkit-color-swatch-wrapper { padding: 2px; }
.field.color-row input[type="color"]::-webkit-color-swatch { border: none; border-radius: 4px; }
.field.color-row input[type="color"]::-moz-color-swatch { border: none; border-radius: 4px; }

.hidden { display: none !important; }

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}