/* OptiCalc styles — clean, product-ready */
:root{
  --bg: #0f1220;
  --card: #171a2b;
  --text: #e8ebff;
  --muted: #aab1d0;
  --accent: #8f94fb;
  --accent2:#4e54c8;
  --ok:#00c389;
  --warn:#ffb02e;
  --bad:#ff5470;
  --border: #273059;
}
:root.light{
  --bg: #f7f8ff;
  --card: #ffffff;
  --text: #1b1e34;
  --muted: #4a5285;
  --accent: #4e54c8;
  --accent2:#8f94fb;
  --border:#dbe0ff;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Cantarell,Inter,Arial,sans-serif}
.app-header{display:flex;align-items:center;gap:12px;padding:14px 18px;border-bottom:1px solid var(--border);position:sticky;top:0;background:var(--bg);z-index:10}
.logo{width:40px;height:40px}
.titles h1{margin:0;font-size:20px;letter-spacing:0.3px}
.subtitle{margin:2px 0 0 0;color:var(--muted);font-size:12px}
.actions{margin-left:auto;display:flex;gap:8px}
.actions button{padding:8px 10px;border:1px solid var(--border);background:var(--card);color:var(--text);border-radius:8px;cursor:pointer}
.actions button:hover{border-color:var(--accent)}

.container{max-width:1050px;margin:20px auto;padding:0 16px}
.card{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:16px 16px 18px 16px;margin-bottom:16px;box-shadow:0 6px 24px rgba(0,0,0,.12)}
.card h2{margin:4px 0 12px 0;font-size:18px}

.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:10px}
label{display:flex;flex-direction:column;gap:6px;font-size:13px;color:var(--muted)}
input,select{padding:10px 12px;border:1px solid var(--border);border-radius:10px;background:transparent;color:var(--text);outline:none}
input:focus,select:focus{border-color:var(--accent)}

.row{display:flex;align-items:center;gap:10px}
.wrap{flex-wrap:wrap}
.checkbox{flex-direction:row;align-items:center;gap:8px}

button{padding:10px 14px;border:0;border-radius:10px;background:linear-gradient(90deg,var(--accent),var(--accent2));color:white;font-weight:600;cursor:pointer}
button.secondary{background:transparent;border:1px solid var(--border);color:var(--text)}
button.outline{background:transparent;border:1px solid var(--accent);color:var(--accent)}
button:disabled{opacity:.6;cursor:not-allowed}

.settings{margin-left:auto;padding:8px 12px;border:1px dashed var(--border);border-radius:8px}
.settings summary{cursor:pointer}

.msg{min-height:20px;color:var(--muted)}

.results{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:12px}
.result-card{border:1px solid var(--border);border-radius:12px;padding:12px;background:transparent}
.kvs{display:grid;gap:8px}
.kvs.two-col{grid-template-columns:1fr 1fr;gap:8px 14px}
.kvs span{color:var(--muted)}
.kvs strong{font-variant-numeric:tabular-nums}

.footer{max-width:1050px;margin:8px auto 24px auto;color:var(--muted);text-align:center;font-size:12px}

.legend{display:flex;gap:12px;margin-top:6px}
.legend-item{display:inline-flex;align-items:center;gap:6px}
.legend-item::before{content:'';display:inline-block;width:12px;height:12px;border-radius:2px;background:var(--accent)}
.legend-item[data-color="curve2"]::before{background:var(--ok)}
.legend-item[data-color="breakeven"]::before{background:var(--warn)}

canvas{width:100%;height:auto;border-radius:10px;border:1px solid var(--border);background:linear-gradient(0deg,rgba(255,255,255,0.02),rgba(255,255,255,0.01))}

/* Print */
@media print {
  .app-header, .actions, #fetchBtn, .settings, #savePngBtn { display:none !important; }
  body{background:white;color:black}
  .card{box-shadow:none;border:1px solid #ddd}
}

/* Light mode default if user preference */
@media (prefers-color-scheme: light){
  :root{ --bg:#f7f8ff; --card:#fff; --text:#1b1e34; --muted:#4a5285; --accent:#4e54c8; --accent2:#8f94fb; --border:#dbe0ff; }
}

/* Hide API settings by default as requested */
.settings{display:none !important}