.exam-shell{background:#d9d8d3;padding:18px;border-radius:12px}.exam-top{display:flex;gap:12px;align-items:center;justify-content:space-between;background:#fff;border-bottom:1px solid #ccc;padding:10px;position:sticky;top:70px;z-index:10}.exam-layout{display:grid;grid-template-columns:230px 1fr;gap:16px}.roadmap{background:#fff;border-radius:12px;padding:14px;position:sticky;top:130px;height:calc(100vh - 160px);overflow:auto}.roadmap a{display:block;padding:8px;border-bottom:1px solid #eee}.question-card{background:#fff;border-radius:12px;margin:16px 0;padding:20px;border:1px solid #ddd}.passage{background:#eef8ff;border-left:4px solid #4db3ff;padding:14px;margin:10px 0;max-height:420px;overflow:auto}.option{display:block;background:#f8fafc;border:1px solid #e2e8f0;border-radius:10px;padding:10px;margin:8px 0}.writing{min-height:240px}.dark-mode{background:#101827;color:#e5e7eb}.dark-mode .question-card,.dark-mode .roadmap,.dark-mode .exam-top{background:#172033;color:#e5e7eb}@media(max-width:900px){.exam-layout{grid-template-columns:1fr}.roadmap{position:relative;top:0;height:auto}.exam-top{top:0;flex-wrap:wrap}}