body {
  margin: 0;
  background: #6dc3dd;
  font-family: Tahoma, Geneva, sans-serif;
}

#app {
  text-align: center;
  padding-top: 20px;
}

canvas {
  background: transparent;
  cursor: pointer;
  user-select: none;
}

/* ===== Controls ===== */
fieldset {
  margin: 20px auto;
  width: fit-content;
  border: 2px solid #6b3f00;
  border-radius: 10px;
  padding: 12px 16px;
}

legend {
  background: #8b5a00;
  color: white;
  padding: 5px 10px;
  border-radius: 8px;
}

fieldset label {
  margin-right: 12px;
  font-weight: bold;
}

.checkbox {
  margin-left: 10px;
  font-weight: normal;
}

button {
  background: #92d417;
  border: 1px solid #6b3f00;
  border-radius: 6px;
  padding: 4px 12px;
  cursor: pointer;
}

button:hover {
  background: #50e030;
}
.title {
  margin: 0;
  font-size: 32px;
  color: #3b1f00;
}

.subtitle {
  margin: 4px 0 12px;
  font-size: 16px;
  color: #5a2d00;
  font-weight: normal;
}
/* ================== THEMES ================== */
:root {
  --bg: #6dc3dd;
  --panel: #ffffffcc;
  --text: #3b1f00;
  --legend: #8b5a00;
  --button: #92d417;
}

body {
  background: var(--bg);
  color: var(--text);
}

fieldset {
  background: var(--panel);
}

legend {
  background: var(--legend);
}

button {
  background: var(--button);
}

/* ---------- DARK MODE ---------- */
body.theme-dark {
  --bg: #dfd4d4;
  --panel: #2a2a2a;
  --text: #eaeaea;
  --legend: #444;
  --button: #555;
}

/* ---------- LIGHT MODE ---------- */
body.theme-light {
  --bg: #f2f2f2;
  --panel: #ffffff;
  --text: #222;
  --legend: #ddd;
  --button: #cce55a;
}

/* ---------- WOOD MODE ---------- */
body.theme-wood {
  --bg: #e9b788;
  --panel: #c9a36a;
  --text: #2b1a0d;
  --legend: #8b5a00;
  --button: #a36b2c;
}