:root{--brand-primary:#1f3a93;--brand-secondary:#f5a623;--surface:#ffffff;--surface-muted:#f4f5f7;--text:#16181d;--text-muted:#5b616e;--border:#d8dbe2;--danger:#b3261e;--success:#14713d;--radius:12px}*{box-sizing:border-box}body,html{margin:0;padding:0}body{background:var(--surface-muted);color:var(--text);font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;font-size:16px;line-height:1.5;-webkit-text-size-adjust:100%}main{max-width:640px;margin:0 auto;padding:16px}.shell{min-height:100dvh;display:flex;flex-direction:column}.brand{display:flex;align-items:center;gap:12px;padding:12px 16px;background:var(--brand-primary);color:#fff}.brand__logo{width:40px;height:40px;object-fit:contain;background:rgba(255,255,255,.15);border-radius:8px}.brand__name{font-size:1.05rem;margin:0;font-weight:600}.form,.panel{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:16px;margin:16px 0}h2{margin-top:0;font-size:1.25rem}.field{display:flex;flex-direction:column;gap:6px;margin-bottom:14px}label{font-weight:600;font-size:.95rem}input,select{font:inherit;padding:12px;border:1px solid var(--border);border-radius:8px;background:var(--surface);color:var(--text);min-height:48px}a:focus-visible,button:focus-visible,input:focus-visible{outline:3px solid var(--brand-secondary);outline-offset:2px}.button{font:inherit;font-weight:600;width:100%;min-height:48px;padding:12px 16px;border:0;border-radius:8px;background:var(--brand-primary);color:#fff;cursor:pointer}.button[disabled]{opacity:.6;cursor:progress}.button--ghost{background:transparent;color:var(--brand-primary);border:1px solid var(--border);margin-top:16px}.error{color:var(--danger);font-weight:600;margin:0 0 12px}.muted{color:var(--text-muted);font-size:.95rem}.tiles{display:grid;grid-gap:12px;gap:12px}.tile{display:flex;align-items:center;min-height:64px;padding:16px;border-radius:var(--radius);border:1px solid var(--border);background:var(--surface-muted);color:var(--text);font-weight:600;text-decoration:none}.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}.topics{list-style:none;margin:0 0 16px;padding:0;display:grid;grid-gap:12px;gap:12px}.tile{flex-direction:column;align-items:flex-start;gap:4px}.tile__title{font-weight:600}.tile__meta{font-weight:400;font-size:.9rem;color:var(--text-muted)}.badge{display:inline-block;margin-top:4px;padding:2px 8px;border-radius:999px;font-size:.8rem;font-weight:600}.badge--weak{background:#fdecea;color:var(--danger)}.question__image{display:block;width:100%;height:auto;border-radius:8px}.image-fallback,.question__image{background:var(--surface-muted);margin-bottom:12px}.image-fallback{padding:16px;border:1px dashed var(--border);border-radius:8px}.question__prompt{font-weight:600;margin:0 0 12px}.answers{border:0;margin:0 0 12px;padding:0;display:grid;grid-gap:8px;gap:8px}.answer{display:flex;align-items:center;gap:10px;min-height:48px;padding:10px 12px;border:1px solid var(--border);border-radius:8px;cursor:pointer}.answer--correct{border-color:var(--success);background:#e8f5ed}.answer--wrong{border-color:var(--danger);background:#fdecea}.feedback{margin-top:12px;padding:12px;border-radius:8px;background:var(--surface-muted)}.feedback--good{color:var(--success);font-weight:700;margin-top:0}.feedback--bad{color:var(--danger);font-weight:700;margin-top:0}.facts{display:grid;grid-template-columns:repeat(3,1fr);grid-gap:8px;gap:8px;margin:0 0 16px}.facts dt{font-size:.85rem;color:var(--text-muted)}.facts dd{margin:2px 0 0;font-weight:700}.exam-bar{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:10px 12px;margin-top:16px;border-radius:var(--radius);background:var(--surface);border:1px solid var(--border);font-size:.95rem}.exam-bar__clock{font-feature-settings:"tnum";font-variant-numeric:tabular-nums;font-weight:700}.exam-nav{display:flex;gap:8px}.exam-nav .button{margin-top:0}.history{list-style:none;margin:0;padding:0;display:grid;grid-gap:8px;gap:8px}.history__row{display:flex;align-items:center;justify-content:space-between;gap:8px;flex-wrap:wrap;padding:10px 12px;border:1px solid var(--border);border-radius:8px}.badge--pass{background:#e8f5ed;color:var(--success)}.open-access{margin:0;padding:10px 16px;background:var(--danger);color:#fff;font-size:.85rem;line-height:1.4}.open-access strong{display:block;font-size:.95rem}.brand--admin{background:#16181d}textarea{font:inherit;font-size:.85rem;border:1px solid var(--border);background:var(--surface);color:var(--text)}.codes,textarea{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;padding:12px;border-radius:8px}.codes{list-style:none;margin:12px 0 0;background:var(--surface-muted);display:grid;grid-gap:4px;gap:4px}.issues{margin:0 0 12px;padding-left:20px;color:var(--danger);font-size:.9rem}