* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  background: #05060a;
  overflow: hidden;
  font-family: -apple-system, "Segoe UI", "Hiragino Kaku Gothic ProN", sans-serif;
}

#canvas {
  display: block;
  width: 100vw;
  height: 100vh;
  cursor: crosshair;
}

.hud {
  position: fixed;
  top: 16px;
  left: 16px;
  width: 260px;
  background: rgba(10, 12, 20, 0.75);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 12px;
  padding: 16px;
  color: #e8eaf0;
  z-index: 10;
}

.hud-title {
  font-weight: 700;
  font-size: 1.05rem;
  background: linear-gradient(135deg, #6ea8fe, #f472b6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hud-sub {
  font-size: 0.72rem;
  color: #9aa1ac;
  margin: 4px 0 14px;
  line-height: 1.5;
}

.row {
  margin-bottom: 12px;
}

.row label {
  display: block;
  font-size: 0.72rem;
  color: #9aa1ac;
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

input[type="range"] {
  width: 100%;
}

select, input[type="file"] {
  width: 100%;
  background: #12141c;
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: #e8eaf0;
  border-radius: 6px;
  padding: 6px 8px;
  font-size: 0.8rem;
}

.fps-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.72rem;
  color: #6ea8fe;
  margin-bottom: 0;
}

.muted {
  color: #9aa1ac;
}