.practice-hub{max-width:1000px}.practice-hub>.judge-field{max-width:420px;margin:28px 0}.quiz-grid{gap:20px;display:grid}.quiz-card{border:1px solid var(--border);background:var(--surface);border-radius:16px;gap:18px;min-width:0;padding:26px;display:grid}.quiz-card h2,.quiz-card h3,.quiz-card p{margin:0;line-height:1.65}.quiz-card h3{font-size:1.2rem}.quiz-card p,.practice-note{color:var(--muted)}.quiz-card pre{border:1px solid var(--border);background:var(--background);border-radius:10px;max-width:100%;padding:18px;font:.9rem/1.8 ui-monospace,monospace;overflow:auto}.quiz-actions{flex-wrap:wrap;gap:12px;display:flex}.quiz-options{border:0;gap:12px;margin:0;padding:0;display:grid}.quiz-options legend{color:var(--muted);margin-bottom:12px}.quiz-option{border:1px solid var(--border);cursor:pointer;border-radius:10px;align-items:center;gap:14px;min-height:52px;padding:14px;display:flex}.quiz-option.selected{border-color:var(--mint);background:var(--success-bg)}.quiz-option input{accent-color:var(--mint);flex-shrink:0;width:18px;height:18px}.quiz-option:focus-within{outline:2px solid var(--mint);outline-offset:3px}.quiz-feedback{background:var(--success-bg);border:1px solid var(--success-border);border-radius:12px;padding:20px;line-height:1.6}.quiz-card details{border-top:1px solid var(--border);padding:16px 0;line-height:1.7}.quiz-card summary{cursor:pointer;min-height:44px;display:list-item}.practice-note{margin-top:26px;font-size:.9rem;line-height:1.8}.practice-note a{text-decoration:underline}.practice-links{color:var(--mint);flex-wrap:wrap;gap:22px;margin:22px 0;display:flex}@media (max-width:600px){.quiz-card{padding:20px 16px}.quiz-actions{flex-direction:column}.quiz-actions .button{width:100%}.quiz-card pre{font-size:.8rem}}.quiz-card .primary-button{justify-content:center;width:auto;margin-top:0}.quiz-card .button:disabled{opacity:.45;cursor:default}.quiz-option{margin:0}.quiz-option input{min-height:18px;padding:0}.exam-library{gap:22px;margin-top:28px;display:grid}.exam-library h2,.exam-library p{margin:0}.exam-filters{grid-template-columns:1fr 1fr;gap:18px;display:grid}.exam-filters label{gap:10px;display:grid}.practice-switch{flex-wrap:wrap;gap:12px;margin:24px 0;display:flex}.practice-switch [aria-pressed=true]{border-color:var(--mint);background:var(--success-bg);color:var(--mint)}.exam-library nav{align-items:center}.exam-library button:disabled{opacity:.4;cursor:default}@media (max-width:600px){.exam-filters{grid-template-columns:1fr}.practice-switch .button{flex:1;min-width:130px}}