:root{--bg: #0f1115;--surface: #171a21;--surface-2: #1e222b;--border: #2a2f3a;--text: #e6e8ec;--muted: #9aa3b2;--accent: #4cc9b0;--accent-dim: #2f6f64;--correct: #3fb950;--wrong: #f0613a;--half: #d6a72e;--radius: 12px;--maxw: 720px;--font: "Segoe UI", "Noto Naskh Arabic", "Tahoma", system-ui, -apple-system, sans-serif}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font);font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased}button{font-family:inherit}a{color:var(--accent)}.app{min-height:100%;display:flex;flex-direction:column}.topbar{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 16px;border-bottom:1px solid var(--border);background:var(--surface);position:sticky;top:0;z-index:10}.topbar .left,.topbar .right{display:flex;align-items:center;gap:12px}.iconbtn.back{color:var(--text);font-weight:600}.content{flex:1;width:100%;max-width:var(--maxw);margin:0 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ease,border-color .15s ease}.btn:hover{background:#242936}.btn:active{transform:translateY(1px)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn.primary{background:var(--accent-dim);border-color:var(--accent);color:#eafff9}.btn.primary:hover{background:#3a8478}.btn.ghost{background:transparent}.btn.block{width:100%}.btn.lg{padding:14px 18px;font-size:1.05rem}.btn.correct{border-color:var(--correct);color:var(--correct)}.btn.correct:hover{background:#3fb9501f}.btn.wrong{border-color:var(--wrong);color:var(--wrong)}.btn.wrong:hover{background:#f0613a1f}.btn.half{border-color:var(--half);color:var(--half)}.btn.half:hover{background:#d6a72e1f}.btn-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}.btn-grid.three{grid-template-columns:1fr 1fr 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0}.prompt{font-size:1.35rem;line-height:1.7;white-space:pre-wrap}.answer{font-size:1.15rem;line-height:1.7;white-space:pre-wrap;color:var(--text)}.qimg{max-width:100%;border-radius:10px;border:1px solid var(--border);margin-top:12px}.choices{display:grid;gap:10px;margin-top:16px}.choice{text-align:start}.align-tools{display:flex;align-items:center;gap:8px}.align-group{display:inline-flex;border:1px solid var(--border);border-radius:8px;overflow:hidden}.align-btn{display:inline-flex;align-items:center;justify-content:center;width:30px;height:28px;padding:0;cursor:pointer;background:var(--surface);color:var(--muted);border:0;border-inline-start:1px solid var(--border)}.align-btn:first-child{border-inline-start:0}.align-btn:hover{background:var(--surface-2);color:var(--text)}.align-btn.active{background:var(--surface-2);color:var(--accent)}.align-btn svg{fill:currentColor}.card[data-align=right] .prompt,.card[data-align=right] 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