body{background:#f5f7fb;font-family:Inter,Arial,sans-serif}.navbar-brand{font-weight:800}.hero{background:linear-gradient(135deg,#0d6efd,#6610f2);color:#fff;border-radius:0 0 30px 30px}.card{border:0;border-radius:18px;box-shadow:0 8px 25px rgba(0,0,0,.06)}.option{border:1px solid #dee2e6;border-radius:12px;padding:14px;margin-bottom:10px;cursor:pointer;transition:.2s}.option:hover{background:#f0f6ff;border-color:#86b7fe}.option input{margin-right:10px}.question-card{min-height:300px}.timer{font-size:22px;font-weight:800;color:#dc3545}.progress{height:10px}.stat-card{padding:20px}.table td,.table th{vertical-align:middle}