*{box-sizing:border-box}
html,body{margin:0;height:100%;overflow:hidden;background:#000;font-family:system-ui,sans-serif;color:#fff}
#ar{position:fixed;inset:0}
#overlay{position:fixed;inset:0;z-index:10;display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:12px;padding:24px;text-align:center;background:linear-gradient(160deg,#4f46e5,#06b6d4)}
#overlay h1{margin:0;font-size:2rem}
#start{font-size:1.25rem;padding:14px 40px;border:0;border-radius:999px;background:#fff;color:#4f46e5;font-weight:700}
#start:disabled{opacity:.6}
#hint{position:fixed;left:50%;bottom:calc(24px + env(safe-area-inset-bottom));transform:translateX(-50%);z-index:5;
  background:rgba(0,0,0,.55);padding:10px 16px;border-radius:999px;font-size:.9rem;text-align:center;max-width:90%}
#label{position:fixed;top:calc(16px + env(safe-area-inset-top));left:16px;z-index:5;width:56px;height:56px;border-radius:50%;
  background:#fff;color:#4f46e5;font-size:2rem;font-weight:800;display:flex;align-items:center;justify-content:center}
.hidden{display:none!important}

/* ---- Kuis ---- */
#quiz{position:fixed;inset:0;z-index:20;display:flex;align-items:flex-end;justify-content:center;
  background:rgba(0,0,0,.55);padding:12px;padding-bottom:calc(12px + env(safe-area-inset-bottom))}
#q-card{width:100%;max-width:520px;background:#fff;color:#1f2937;border-radius:24px;padding:18px;text-align:center}
#q-text{margin:0 0 14px;font-size:1.3rem;font-weight:800;color:#4f46e5}
#q-options{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.opt{border:3px solid #e5e7eb;border-radius:16px;background:#f9fafb;padding:8px 4px;display:flex;flex-direction:column;
  align-items:center;gap:6px;font-size:.85rem;font-weight:700;color:#1f2937}
.opt img{width:100%;aspect-ratio:1;object-fit:contain}
.opt:active{transform:scale(.96)}
.opt.wrong{border-color:#ef4444;background:#fee2e2;animation:shake .4s}
#q-feedback img{max-width:70%;max-height:36vh;object-fit:contain}
#q-feedback img.pop{animation:pop .6s}
#q-feedback p{font-size:1.15rem;font-weight:700;margin:10px 0}
#fb-btn{font-size:1.1rem;padding:12px 32px;border:0;border-radius:999px;background:#4f46e5;color:#fff;font-weight:700}
@keyframes shake{25%{transform:translateX(-8px)}75%{transform:translateX(8px)}}
@keyframes pop{0%{transform:scale(.2);opacity:0}70%{transform:scale(1.15)}100%{transform:scale(1);opacity:1}}