:root {
  --bg: #0f1220;
  --panel: #171a2b;
  --text: #e8eaf6;
  --muted: #aab1d6;
  --accent: #6c8cff;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: radial-gradient(1200px 800px at 20% 10%, #141a35, var(--bg));
  color: var(--text);
  font-family: ui-sans-serif, -apple-system, Segoe UI, Roboto, Helvetica, Arial, Apple Color Emoji, Segoe UI Emoji;
}

header {
  padding: 24px 20px 8px;
}
header h1 {
  margin: 0 0 8px;
  font-size: 24px;
}
header p {
  margin: 0;
  color: var(--muted);
}

main {
  padding: 12px 20px 24px;
  display: grid;
  gap: 16px;
}

.controls {
  background: var(--panel);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 12px;
  padding: 16px;
  display: grid;
  gap: 12px;
}

.control-row {
  display: grid;
  gap: 12px;
}

@media (min-width: 800px) {
  .control-row {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: end;
  }
}

.control-group { display: grid; gap: 6px; }
label { font-size: 14px; color: var(--muted); }
input[type="file"] { color: var(--text); }
input[type="range"] { width: 100%; }

button {
  background: var(--accent);
  color: #0b1029;
  border: none;
  padding: 10px 14px;
  font-weight: 600;
  border-radius: 10px;
  cursor: pointer;
}
button:disabled {
  background: #3a426d;
  color: #9aa4d9;
  cursor: not-allowed;
}

#status { margin-left: 12px; color: var(--muted); }

.preview {
  background: var(--panel);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 12px;
  padding: 16px;
  display: grid;
  place-items: center;
  min-height: 40vh;
}

#canvas, #video {
  max-width: 100%;
  height: auto;
}