:root{--bg:#0b1020;--fg:#eef2ff;--muted:#aab1c5;--card:#131a2e;--border:#24304f;--primary:#0d6efd;--success:#22c55e;--danger:#ef4444}
*{box-sizing:border-box}
html,body{margin:0;padding:0;font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Cantarell,Noto Sans,sans-serif;background:var(--bg);color:var(--fg)}
.app-header{padding:16px 16px 0; text-align:center}
.app-header h1{margin:0;font-weight:700;font-size:24px}
.app-header p{margin:4px 0 12px;color:var(--muted)}
.container{max-width:760px;margin:0 auto;padding:16px}
.card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:16px;margin-bottom:16px}
.hidden{display:none}
.field{display:flex;flex-direction:column;gap:8px;margin-bottom:12px}
label{font-weight:600}
input,select{background:#0f1528;color:var(--fg);border:1px solid var(--border);border-radius:8px;padding:10px;font-size:16px}
.row{display:flex;gap:8px;flex-wrap:wrap}
.btn{appearance:none;border:1px solid var(--border);background:#0f1528;color:var(--fg);border-radius:10px;padding:10px 14px;font-weight:600;cursor:pointer}
.btn[disabled]{opacity:.6;cursor:not-allowed}
.btn.primary{background:var(--primary);border-color:transparent}
.btn.success{background:var(--success);border-color:transparent}
.btn.danger{background:var(--danger);border-color:transparent}

.quiz-meta{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px;color:var(--muted)}
.question{margin-bottom:12px;font-size:18px;line-height:1.35}
.image{margin:8px 0;border-radius:8px;overflow:hidden;border:1px solid var(--border)}
.image img{max-width:100%;display:block}
.options{display:flex;flex-direction:column;gap:8px}
.option{display:flex;gap:10px;align-items:flex-start;background:#0f1528;border:1px solid var(--border);border-radius:10px;padding:10px}
.option input{margin-top:4px}
.feedback{margin-top:10px;padding:10px;border-radius:10px}
.feedback.ok{background:#0e2d19;border:1px solid #174b2a}
.feedback.err{background:#3a1418;border:1px solid #5f1e25}
.source{margin-top:8px;color:var(--muted);font-size:12px}

/* Desktop tweaks */
@media(min-width:768px){
  .question{font-size:20px}
  .option{padding:12px}
}

.app-footer{padding:12px;text-align:center;color:var(--muted)}