*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  background: #0d0d0f;
  color: #d0d0d8;
  font-family: "Segoe UI", system-ui, sans-serif;
  font-size: 13px;
  margin: 0;
  padding: 0;
  height: 100vh;
}

#app {
  display: flex;
  height: 100%;
  min-width: 500px;  /* below this, horizontal scroll is acceptable */
}

/* ── Canvas ─────────────────────────────────────────────────────────────── */

#canvas {
  flex: 1;
  display: block;
  min-width: 0;
  min-height: 0;
  background: #08090c;
  cursor: crosshair;
}

/* ── Side panel ─────────────────────────────────────────────────────────── */

#panel {
  width: 290px;
  flex-shrink: 0;
  background: #13141a;
  border-left: 1px solid #2a2b35;
  display: flex;
  flex-direction: column;
  gap: 0;
  overflow-y: auto;
  overflow-x: clip;  /* clip without creating a scroll container, so slider thumbs aren't blocked */
  padding-bottom: 12px;
}

#panel h1 {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 14px 14px 10px;
  border-bottom: 1px solid #2a2b35;
  color: #e8e8f0;
}

#panel h3 {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #707088;
  margin-bottom: 8px;
}

#panel section {
  padding: 12px 14px;
  border-bottom: 1px solid #1e1f28;
}

/* ── Form controls ───────────────────────────────────────────────────────── */

label {
  display: flex;
  flex-direction: column;
  gap: 5px;
  color: #a0a0b8;
}

label + label { margin-top: 10px; }

input[type="range"] {
  -webkit-appearance: none;
  width: 100%;
  height: 4px;
  background: #2a2b3a;
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #6070d8;
  cursor: pointer;
}

input[type="range"]::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #6070d8;
  border: none;
  cursor: pointer;
}

span { font-size: 11px; color: #6868a0; }

/* ── Checkbox ───────────────────────────────────────────────────────────── */

label:has(input[type="checkbox"]) {
  flex-direction: row;
  align-items: center;
  gap: 8px;
  cursor: pointer;
}

input[type="checkbox"] {
  accent-color: #6070d8;
  width: 14px;
  height: 14px;
}

/* ── Stats ───────────────────────────────────────────────────────────────── */

#stats {
  font-size: 12px;
  line-height: 1.8;
  color: #7878a0;
}

#stats span {
  font-size: 12px;
  color: #c0c0d8;
}

/* ── Buttons ─────────────────────────────────────────────────────────────── */

button {
  background: #22233a;
  border: 1px solid #3a3b55;
  color: #c0c0d8;
  padding: 6px 12px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 12px;
  margin-right: 6px;
  transition: background 0.15s;
}

button:hover { background: #2e2f50; }
button:active { background: #3a3b60; }

/* ── Config section ──────────────────────────────────────────────────────── */

#configSection select {
  width: 100%;
  background: #1c1d2a;
  border: 1px solid #3a3b55;
  color: #c0c0d8;
  padding: 5px 8px;
  border-radius: 4px;
  font-size: 12px;
  margin-bottom: 6px;
  cursor: pointer;
}

#configSection details summary {
  cursor: pointer;
  font-size: 11px;
  color: #7070a0;
  margin-top: 8px;
  user-select: none;
}

#configSection textarea {
  width: 100%;
  max-width: 100%;
  margin-top: 6px;
  background: #111218;
  border: 1px solid #2a2b3a;
  color: #c0c0d8;
  font-family: "Consolas", monospace;
  font-size: 10px;
  padding: 6px;
  border-radius: 4px;
  resize: vertical;
}