/* --- CSS Reset (modern minimal) --- */
* { box-sizing: border-box; }
html, body { height: 100%; }
body { margin: 0; font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif; color: #0f172a; background: var(--bg); }

:root {
  --bg: #0f1530;
  --panel: #151c38;
  --panel-2: #1a2448;
  --text: #e5e7eb;
  --muted: #9aa4b2;
  --brand: #6ee7ff;
  --accent: #8b5cf6;
  --grid: rgba(255,255,255,0.07);
  --fov: #58f29e;
  --dim: rgba(0,0,0,0.6);
  --input-bg: #121a36;
}

.app-header { padding: 20px 24px; background: linear-gradient(180deg, rgba(110,231,255,0.08), rgba(139,92,246,0.06)); border-bottom: 1px solid rgba(255,255,255,0.08); }
.app-header h1 { margin: 0 0 6px; color: var(--text); font-weight: 700; letter-spacing: 0.3px; }
.app-header p { margin: 0; color: var(--muted); }

.app { display: grid; grid-template-columns: 360px 1fr; gap: 16px; padding: 16px; }
@media (max-width: 960px) { .app { grid-template-columns: 1fr; } }

.controls { background: var(--panel); border: 1px solid rgba(255,255,255,0.08); border-radius: 12px; padding: 14px; position: sticky; top: 10px; height: fit-content; }
.control-grid { display: grid; grid-template-columns: 1fr; gap: 14px; }
.control { background: var(--panel-2); border: 1px solid rgba(255,255,255,0.06); padding: 10px; border-radius: 10px; }
.control label { display: block; color: var(--text); font-size: 14px; margin-bottom: 8px; }
.control input[type="number"] { width: 100%; padding: 8px 10px; border-radius: 8px; border: 1px solid rgba(255,255,255,0.14); background: var(--input-bg); color: var(--text); }
.control input[type="range"] { width: 100%; }

.control-row { display: grid; grid-template-columns: 1fr; gap: 8px; margin-bottom: 10px; }
#mode, #aspectPreset { width: 100%; padding: 8px 10px; border-radius: 8px; border: 1px solid rgba(255,255,255,0.14); background: var(--input-bg); color: var(--text); }

.control-row label { display: block; color: var(--text); font-size: 14px; margin-bottom: 8px; }

.aspect { display: grid; grid-template-columns: 1fr 16px 1fr auto; gap: 8px; align-items: center; }
.aspect span { text-align: center; color: var(--muted); }

.toggles { display: grid; gap: 8px; }
.toggle { color: var(--text); font-size: 14px; display: flex; gap: 8px; align-items: center; }

.hint { color: var(--muted); font-size: 12px; margin-top: 6px; }

.stage { background: radial-gradient(1200px 600px at 50% 120%, rgba(139,92,246,0.12), transparent),
                  radial-gradient(1200px 600px at -20% -20%, rgba(110,231,255,0.10), transparent);
         border: 1px solid rgba(255,255,255,0.08); border-radius: 12px; padding: 8px; min-height: 60vh; }
#canvas { width: 100%; height: 70vh; display: block; background: #0a0f20; border-radius: 8px; }

.app-footer { color: var(--muted); padding: 16px 24px; text-align: center; }

/* Grid and guides rendering are done via canvas, styles focus on layout/appearance */