:root{
--bg:#f5f7fb; --card:#fff; --accent:#4f46e5; --muted:#6b7280;
}
*{box-sizing:border-box}
body{font-family:Inter,ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,'Helvetica Neue',Arial; margin:0;background:var(--bg);color:#111}
.container{max-width:1100px;margin:0px auto;padding:0px}
.topbar{display:flex;justify-content:space-between;align-items:center;padding:12px;background:var(--card);border-radius:8px;box-shadow:0 1px 4px rgba(16,24,40,.06)}
.topbar .title{font-weight:700}
.topbar .controls{display:flex;align-items:center;gap:8px}
.topbar select{padding:6px;border-radius:6px;border:1px solid #e6e9ef}
.main{display:grid;grid-template-columns:1fr 320px;gap:16px;margin-top:16px}
.questions{background:var(--card);padding:18px;border-radius:8px;box-shadow:0 1px 4px rgba(16,24,40,.06)}
.meta{font-size:13px;color:var(--muted)}
.qtext{margin:10px 0 18px}
.options{display:flex;flex-direction:column;gap:10px}
.option{padding:12px;border-radius:8px;border:1px solid #e6e9ef;background:#fff;cursor:pointer;display:flex;justify-content:space-between;align-items:center}
.option.selected{border-color:var(--accent);background:rgba(79,70,229,.06)}
.option.correct{border-color:#16a34a;background:rgba(16,185,129,.06)}
.option.wrong{border-color:#ef4444;background:rgba(239,68,68,.06)}
.actions{margin-top:16px;display:flex;gap:10px}
.actions button{padding:8px 12px;border-radius:6px;border:1px solid #e6e9ef;background:#fff;cursor:pointer}
.actions .primary{background:var(--accent);color:#fff;border:0}
.sidebar{display:flex;flex-direction:column;gap:12px}
.palette{display:grid;grid-template-columns:repeat(5,1fr);gap:8px;padding:12px;background:var(--card);border-radius:8px}
.palette button{padding:8px;border-radius:6px;border:1px solid #e6e9ef;background:#f8fafc;cursor:pointer}
.summary{padding:12px;background:var(--card);border-radius:8px}
.instructions{padding:12px;background:var(--card);border-radius:8px}


/* responsive */
@media(max-width:900px){.main{grid-template-columns:1fr}.sidebar{order:2}.questions{order:1}}