:root {
  --bg: #000;
  --panel: rgba(14, 17, 28, 0.86);
  --line: rgba(255, 255, 255, 0.1);
  --text: #e9ecf5;
  --muted: #8d95ad;
  --accent: #ff3b3b;
  --warn: #ffb020;
  --ok: #3ddc97;
  --radius: 14px;
  --font: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 var(--font);
  -webkit-font-smoothing: antialiased;
}

#scene {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}

button { font: inherit; color: inherit; cursor: pointer; }
a { color: inherit; }

/* ---------- Buttons ---------- */
.btn {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.06);
  padding: 8px 14px;
  border-radius: 10px;
  transition: background 0.15s, transform 0.15s;
}
.btn:hover { background: rgba(255, 255, 255, 0.12); }
.btn:active { transform: scale(0.98); }
.btn.primary {
  background: rgba(255, 255, 255, 0.92);
  border-color: transparent;
  color: #0a0b10;
  font-weight: 600;
}
.btn.primary:hover { background: #fff; }
.btn.big { padding: 14px 22px; font-size: 16px; border-radius: 12px; }
.btn.ghost { background: transparent; border-color: transparent; color: rgba(255, 255, 255, 0.8); }
.btn.ghost:hover { color: #fff; background: rgba(255, 255, 255, 0.08); }
.btn-row { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 10px; }

/* ---------- Overlays ---------- */
.overlay {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 16px;
  background: rgba(0, 0, 0, 0.25);
  z-index: 20;
  transition: opacity 0.5s ease;
}
.overlay.gone { opacity: 0; pointer-events: none; }
.overlay[hidden] { display: none; }

/* Translucent glass: the scene shows through, blurred. */
.glass {
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.16);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.18),
    0 20px 60px rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(28px) saturate(160%);
  -webkit-backdrop-filter: blur(28px) saturate(160%);
}

.card {
  max-width: 420px;
  width: 100%;
  padding: 36px 32px 24px;
  border-radius: 28px;
  text-align: center;
}
.card h1 { margin: 0 0 8px; font-size: 40px; font-weight: 650; letter-spacing: -0.025em; line-height: 1.05; }
.lede { margin: 0 auto 28px; max-width: 32ch; color: rgba(255, 255, 255, 0.72); font-size: 15px; }
.actions { display: flex; flex-direction: column; align-items: stretch; gap: 6px; }
.btn.big { border-radius: 999px; }
.glass .btn.ghost { border-radius: 999px; padding: 10px 14px; }
.credit { margin: 22px 0 0; font-size: 12px; color: rgba(255, 255, 255, 0.45); }
.credit a { color: rgba(255, 255, 255, 0.65); text-decoration: none; }
.credit a:hover { color: #fff; }

/* ---------- Tracking Lost pill ---------- */
#pill {
  position: fixed;
  top: 14px;
  left: 50%;
  transform: translate(-50%, -140%);
  display: flex;
  align-items: center;
  gap: 10px;
  max-width: calc(100vw - 32px);
  padding: 8px 10px 8px 14px;
  border-radius: 999px;
  /* Same glass as the start card and corner icons. */
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.16);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.18),
    0 10px 30px rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(28px) saturate(160%);
  -webkit-backdrop-filter: blur(28px) saturate(160%);
  font-size: 13px;
  z-index: 15;
  transition: transform 0.35s cubic-bezier(0.2, 0.9, 0.3, 1.2), opacity 0.35s;
  opacity: 0;
}
#pill.show { transform: translate(-50%, 0); opacity: 1; }
.pill-icon {
  flex: none;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--warn);
  box-shadow: 0 0 10px var(--warn);
  animation: pulse 1.6s ease-in-out infinite;
}
#pill.busy .pill-icon {
  background: none;
  box-shadow: none;
  width: 12px;
  height: 12px;
  border: 2px solid var(--muted);
  border-top-color: var(--text);
  animation: spin 0.8s linear infinite;
}
.pill-action {
  flex: none;
  border: 0;
  border-radius: 999px;
  padding: 4px 10px;
  background: rgba(255, 255, 255, 0.12);
  font-weight: 600;
}
.pill-action:hover { background: rgba(255, 255, 255, 0.2); }
@keyframes pulse { 50% { opacity: 0.35; } }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- Corner HUD ---------- */
#hud {
  position: fixed;
  top: 14px;
  right: 14px;
  display: flex;
  gap: 8px;
  z-index: 16;
}
.icon-btn {
  position: relative;
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--panel);
}
.icon-btn:hover { background: #1b2032; }
.icon-btn.glass {
  background: rgba(255, 255, 255, 0.07);
  border-color: rgba(255, 255, 255, 0.16);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.18), 0 8px 24px rgba(0, 0, 0, 0.3);
}
.icon-btn.glass:hover { background: rgba(255, 255, 255, 0.14); }
.icon-btn.active { border-color: rgba(255, 255, 255, 0.45); }
.icon-btn svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}
/* Unrecognized Device: nudge the viewer to check settings. */
#btn-settings.badge::after {
  content: "";
  position: absolute;
  top: -3px;
  right: -3px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--warn);
  border: 2px solid var(--bg);
  box-shadow: 0 0 10px var(--warn);
}

/* ---------- Settings panel ---------- */
#settings {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(400px, 100vw);
  padding: 18px 20px 24px;
  overflow-y: auto;
  /* Same glass as the start card. */
  background: rgba(255, 255, 255, 0.07);
  border-left: 1px solid rgba(255, 255, 255, 0.16);
  box-shadow: inset 1px 0 0 rgba(255, 255, 255, 0.1), -20px 0 60px rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(28px) saturate(160%);
  -webkit-backdrop-filter: blur(28px) saturate(160%);
  z-index: 18;
  transform: translateX(105%);
  transition: transform 0.3s ease;
}
#settings.open { transform: none; }
.panel-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 10px; }
.panel-head h2 { margin: 0; font-size: 18px; }
.panel-head .icon-btn { width: 32px; height: 32px; }
.device-status {
  padding: 10px 12px;
  border-radius: 10px;
  font-size: 13px;
  margin-bottom: 14px;
  border: 1px solid var(--line);
}
.device-status.ok { border-color: rgba(61, 220, 151, 0.35); background: rgba(61, 220, 151, 0.07); }
.device-status.warn { border-color: rgba(255, 176, 32, 0.5); background: rgba(255, 176, 32, 0.08); }
fieldset {
  border: 1px solid var(--line);
  border-radius: 12px;
  margin: 0 0 14px;
  padding: 6px 14px 14px;
}
legend { padding: 0 6px; font-size: 12px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }
.field { display: block; padding: 8px 0 4px; }
.field-label { display: block; font-size: 13px; }
.field-label small { display: block; color: var(--muted); font-size: 11.5px; }
.field-input { display: flex; align-items: center; gap: 8px; margin-top: 4px; }
.field-input input[type="range"] { flex: 1; accent-color: var(--accent); min-width: 0; }
.field-input input[type="number"] {
  width: 72px;
  padding: 4px 6px;
  border-radius: 6px;
  border: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.3);
  color: var(--text);
  font: 12px var(--mono);
}
.unit { width: 24px; font-size: 12px; color: var(--muted); }
.fine-print { font-size: 11.5px; color: var(--muted); margin: 6px 0 0; }

/* ---------- Debug overlay ---------- */
#debug {
  position: fixed;
  left: 14px;
  bottom: 14px;
  width: 280px;
  padding: 12px;
  border-radius: var(--radius);
  background: var(--panel);
  border: 1px solid var(--line);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 14;
}
#debug canvas { display: block; width: 256px; height: 144px; border-radius: 8px; background: #000; }
#debug pre { margin: 10px 0 0; font: 11.5px/1.55 var(--mono); white-space: pre-wrap; color: #cdd3e4; }