/* Dokaz Pitagorine teoreme — samostalni paket (UNMCG stil). Bez eksternih resursa. */
:root{
  --navy:#0b2a4a; --navy-2:#123e68; --gold:#d6a84b; --gold-l:#f4e5b8;
  --bg:#f4f7fb; --card:#fff; --text:#132238; --muted:#5b6b86; --border:#dbe3ee;
  --ok:#1f7a4c;
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--text);
  font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;line-height:1.5}
.pit{width:min(1100px,100%);margin:0 auto;padding:16px}
.pit-head{background:linear-gradient(135deg,var(--navy),var(--navy-2));color:#fff;border-radius:18px;padding:22px;margin-bottom:16px}
.pit-eyebrow{display:inline-block;font-size:12px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--gold-l);margin-bottom:6px}
.pit-head h1{margin:0 0 6px;font-size:clamp(22px,4vw,34px)}
.pit-head p{margin:0;color:rgba(255,255,255,.85);max-width:70ch}

.pit-grid{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:16px}
.pit-stage,.pit-panel{min-width:0}
.pit-stage{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:14px}
#fig{display:block;width:100%;height:auto;background:#fff;border:1px solid var(--border);border-radius:12px}
.pit-formula{margin:12px 0 0;padding:12px 14px;border-radius:12px;background:#eef5fb;border-left:4px solid var(--gold);font-weight:650;color:var(--navy)}

.pit-panel{display:grid;gap:14px;align-content:start}
.pit-block{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:14px;display:grid;gap:10px}
label{font-weight:700;font-size:14px}
output{color:var(--navy)}
input[type=range]{width:100%;accent-color:var(--gold);height:28px}
.pit-c{margin:2px 0 0;font-size:15px}
.pit-c b{color:var(--navy)}
.pit-row{display:flex;gap:8px}
.pit-row button{flex:1}
button{border:0;border-radius:11px;padding:11px 12px;font-weight:800;cursor:pointer;min-height:44px;font-size:14px}
button:focus-visible{outline:3px solid var(--gold);outline-offset:2px}
.primary{background:var(--navy);color:#fff}
.gold{background:var(--gold);color:#1e2633}
.ghost{background:#edf2f7;color:var(--navy)}
.sw{display:flex;align-items:center;gap:10px;font-weight:600;font-size:14px}
.sw input{width:20px;height:20px;accent-color:var(--navy)}
.pit-check strong{font-size:14px;color:var(--navy)}
.pit-kv{display:flex;justify-content:space-between;font-variant-numeric:tabular-nums;font-size:14px;border-bottom:1px dashed var(--border);padding:4px 0}
.pit-kv:last-of-type{border-bottom:0}
.pit-kv b{color:var(--navy)}
.pit-ok{margin:6px 0 0;color:var(--ok);font-weight:800}

.lbl{font-size:15px;font-weight:800;fill:var(--text)}
.lbl-w{fill:#fff}
.area-txt{font-size:13px;font-weight:800}

@media (max-width:820px){
  .pit-grid{grid-template-columns:1fr}
  .pit-panel{order:2}
}
@media (max-width:380px){
  .pit{padding:10px}
  .pit-head{padding:16px}
  .pit-row{flex-wrap:wrap}
  .pit-row button{flex:1 1 100%}
}
@media (prefers-reduced-motion:reduce){
  #tris polygon,#innerSq,#areas *{transition:none !important}
}
#tris polygon,#innerSq{transition:opacity .35s ease, transform .45s ease}