:root {
  --bg: #11141a;
  --panel: #1b1f29;
  --panel-2: #232838;
  --text: #e6e9ef;
  --muted: #9aa3b2;
  --accent: #ffb347;
  --border: #2c3243;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}
body {
  overflow: hidden; /* page itself never scrolls */
}

/* Floating, frosted glass look shared by the header and controls panels. */
header, .controls {
  position: fixed;
  z-index: 10;
  background: rgba(27, 31, 41, 0.62);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
}

header {
  top: 16px;
  left: 16px;
  padding: 12px 18px;
}
header h1 { margin: 0; font-size: 1.3rem; }
header .sub { margin: 4px 0 0; color: var(--muted); font-size: 0.82rem; }

/* main no longer lays anything out — its children are positioned themselves. */
main { display: contents; }

/* The canvas is a full-viewport background; everything else floats over it. */
.canvas-wrap {
  position: fixed;
  inset: 0;
  z-index: 0;
}

canvas {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover; /* fill the whole screen; crop overflow rather than letterbox */
  background: #000;
  cursor: grab;
  image-rendering: pixelated;
}

.overlay[hidden] { display: none; }
.overlay {
  position: fixed;
  bottom: 16px;
  right: 16px;
  z-index: 5;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  background: rgba(0, 0, 0, 0.65);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 600;
  border-radius: 999px;
  pointer-events: none; /* never blocks the canvas */
}
.overlay::before {
  content: "";
  width: 10px;
  height: 10px;
  border: 2px solid rgba(255, 255, 255, 0.35);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.hint {
  position: fixed;
  bottom: 16px;
  left: 16px;
  z-index: 5;
  margin: 0;
  padding: 7px 12px;
  color: var(--muted);
  font-size: 0.8rem;
  background: rgba(27, 31, 41, 0.62);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: 999px;
  pointer-events: none;
}

.controls {
  top: 16px;
  right: 16px;
  width: 320px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  max-height: calc(100vh - 32px);
  overflow-y: auto;
  padding: 16px;
}

fieldset {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 14px 14px;
  background: rgba(35, 40, 56, 0.45); /* let the frosted panel show through */
  margin: 0;
}
legend { color: var(--accent); font-size: 0.8rem; padding: 0 6px; text-transform: uppercase; letter-spacing: 0.05em; }

label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 0.82rem;
  color: var(--muted);
  margin-top: 10px;
}
label:first-of-type { margin-top: 4px; }
label.check { flex-direction: row; align-items: center; gap: 8px; }

input[type="number"], input[type="text"], select {
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 7px 9px;
  border-radius: 6px;
  font-size: 0.9rem;
  width: 100%;
}
input[type="color"] {
  width: 48px; height: 32px; padding: 0;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 6px;
}
input[type="range"] { width: 100%; }

.actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

button {
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  padding: 9px 14px;
  border-radius: 6px;
  font-size: 0.9rem;
}
button:hover { border-color: var(--accent); }
button.primary { background: var(--accent); color: #1a1300; border-color: var(--accent); font-weight: 600; flex: 1; }
button.ghost { background: transparent; }

.status { color: var(--muted); font-size: 0.8rem; min-height: 1em; margin: 0; }

.custom-stops { margin-top: 12px; border-top: 1px dashed var(--border); padding-top: 10px; }
.stops-title { margin: 0 0 8px; font-size: 0.78rem; color: var(--muted); }
.stop-row { display: flex; align-items: center; gap: 8px; margin-bottom: 6px; }
.stop-row input[type="range"] { flex: 1; }
.stop-row .pos { width: 38px; text-align: right; font-size: 0.75rem; color: var(--muted); }
.stop-row button { padding: 4px 8px; font-size: 0.8rem; line-height: 1; }