:root {
  color-scheme: dark;
  --bg: #0c0f13;
  --panel: #151a21;
  --line: #242c37;
  --text: #e6ecf3;
  --muted: #8b98a8;
  --accent: #4fd1c5;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 14px/1.45 system-ui, -apple-system, "Segoe UI", sans-serif;
  display: flex;
  flex-direction: column;
  height: 100dvh;
  overflow: hidden;
}

header {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
  flex: none;
}
header h1 { font-size: 15px; margin: 0; letter-spacing: 0.2px; }
header .sub { color: var(--muted); font-size: 12px; }

#stage {
  position: relative;
  flex: 1 1 auto;
  min-height: 0;
  background: #000;
  touch-action: manipulation;
}
#video, #overlay {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}
#video { object-fit: contain; }
#overlay { cursor: crosshair; }

#hud {
  position: absolute;
  left: 12px;
  top: 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  pointer-events: none;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.9);
}
#status {
  align-self: flex-start;
  font: 600 11px/1 ui-monospace, monospace;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 5px 9px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.2);
}
#status[data-state="tracking"] { background: rgba(80, 220, 140, 0.25); border-color: rgba(80, 220, 140, 0.6); }
#status[data-state="searching"] { background: rgba(255, 200, 60, 0.25); border-color: rgba(255, 200, 60, 0.6); }
#status[data-state="ballistic"] { background: rgba(90, 190, 255, 0.25); border-color: rgba(90, 190, 255, 0.6); }
#hint { font-size: 13px; }
#stats { font: 11px/1.3 ui-monospace, monospace; color: #b9c6d4; }
#camInfo {
  font: 11px/1.3 ui-monospace, monospace;
  max-width: 46ch;
  padding: 3px 7px;
  border-radius: 5px;
  align-self: flex-start;
}
#camInfo[data-level="good"] { background: rgba(80, 220, 140, 0.22); color: #d8ffe8; }
#camInfo[data-level="ok"]   { background: rgba(255, 200, 60, 0.22); color: #fff3d4; }
#camInfo[data-level="poor"] { background: rgba(255, 90, 90, 0.25); color: #ffdede; }

select {
  background: #1e2530;
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 7px 9px;
  font-size: 13px;
  max-width: 190px;
}

footer {
  flex: none;
  border-top: 1px solid var(--line);
  background: var(--panel);
  padding: 10px 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
}
.group { display: flex; gap: 8px; align-items: center; }
.group > span.label { color: var(--muted); font-size: 12px; }

button, .filebtn {
  background: #1e2530;
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 7px 11px;
  font-size: 13px;
  cursor: pointer;
}
button:hover, .filebtn:hover { border-color: #3a4657; }
button:disabled { opacity: 0.4; cursor: default; }
button.primary { background: var(--accent); color: #06231f; border-color: transparent; font-weight: 600; }

label.check { display: flex; align-items: center; gap: 6px; font-size: 13px; color: #c6d2e0; }
input[type="range"] { width: 110px; }
#file { display: none; }

@media (max-width: 720px) {
  footer { gap: 10px; padding: 8px 10px; }
  header .sub { display: none; }
}