:root{--navy:#13294b;--primary:#1f5fad;--primary-dark:#163f75;--flag:#b45309;--correct:#136f63;--incorrect:#c2410c;--kw:#ffe08a;--bg:#eef1f5;--surface:#fff;--border:#d5dae1;--border-strong:#a9b3c1;--text:#1a2230;--muted:#4a5568;--focus:#f2a900;--font-sans:"IBM Plex Sans", system-ui, sans-serif;--font-mono:"IBM Plex Mono", monospace;--divider:#e4e8ee;--text-2:#3c4655;--flag-text:#8a4b08;--correct-text:#0f5a50;--correct-tint:#e3f1ee;--correct-bg:#f0f8f6;--incorrect-text:#8a3208;--incorrect-tint:#fbe9df;--incorrect-bg:#fdf3ee}*,:before,:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{background:var(--bg);color:var(--text);font-family:var(--font-sans);margin:0;font-size:16px;line-height:1.4}button,input{font:inherit;color:inherit}button{cursor:pointer}button:disabled{opacity:.45;cursor:not-allowed}:focus-visible{outline:3px solid 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h2{font-size:20px;font-weight:600}.qcards{flex-direction:column;gap:14px;display:flex}.qcard{overflow:hidden}.qcard-head{background:var(--surface);text-align:left;width:100%;min-height:56px;color:var(--text);border:0;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:10px 16px;padding:14px 22px;display:flex}.qcard-title{flex-wrap:wrap;align-items:center;gap:8px 14px;display:flex}.qcard-title .n{font-size:17px;font-weight:600}.qcard-title .topic{color:var(--muted);font-size:14px}.flag-note{color:var(--flag-text);align-items:center;gap:5px;font-size:13px;font-weight:600;display:inline-flex}.qcard-status{color:var(--muted);align-items:center;gap:12px;display:inline-flex}.badge{border-radius:4px;align-items:center;gap:6px;padding:4px 10px;font-size:14px;font-weight:600;display:inline-flex}.badge.ok{background:var(--correct-tint);color:var(--correct-text)}.badge.bad{background:var(--incorrect-tint);color:var(--incorrect-text)}.qcard-body{border-top:1px solid var(--divider);flex-direction:column;gap:16px;padding:4px 22px 22px;display:flex}.qcard-body .stem{margin-top:14px;font-size:16px}mark.kw{background:var(--kw);color:var(--text);border-radius:3px;padding:1px 3px;font-weight:600}.ropts{flex-direction:column;gap:10px;margin:0;padding:0;list-style:none;display:flex}.ropt{border:1px solid var(--border);background:var(--surface);border-radius:6px;flex-direction:column;gap:6px;padding:12px 16px;display:flex}.ropt.correct{border-color:var(--correct);background:var(--correct-bg)}.ropt.wrong{border-color:var(--incorrect);background:var(--incorrect-bg)}.ropt-top{flex-wrap:wrap;justify-content:space-between;align-items:flex-start;gap:6px 16px;display:flex}.ropt-text{overflow-wrap:anywhere;flex:320px;gap:12px;min-width:0;font-size:15px;line-height:1.55;display:flex}.ropt-text strong{flex-shrink:0;width:18px}.tags{flex-wrap:wrap;gap:6px;display:flex}.tag{border-radius:4px;align-items:center;gap:4px;padding:2px 8px;font-size:13px;font-weight:600;display:inline-flex}.tag.correct{background:var(--correct);color:#fff}.tag.wrong{background:var(--incorrect);color:#fff}.tag.yours{border:1px solid var(--correct);color:var(--correct-text)}.why{color:var(--text-2);margin-left:30px;font-size:14px;line-height:1.55}.refs{flex-wrap:wrap;gap:8px 16px;font-size:14px;display:flex}@media (width<=480px){.qcard-head{padding:14px 16px}.qcard-body{padding:4px 16px 18px}.why{margin-left:0}}