.landing-container,.login-container{max-width:400px;margin:80px auto;padding:40px;text-align:center}.landing-container h1,.login-container h1{margin-bottom:30px;color:#333}.user-info{margin-bottom:30px}.user-info .avatar{width:80px;height:80px;border-radius:50%;margin-bottom:15px}.user-info p{margin:5px 0;color:#555}.btn{display:inline-block;padding:12px 24px;font-size:16px;text-decoration:none;border:none;border-radius:6px;cursor:pointer}.btn-primary{background-color:#007bff;color:#fff}.btn-primary:hover{background-color:#0056b3}.btn-secondary{background-color:#6c757d;color:#fff}.btn-secondary:hover{background-color:#545b62}.alert{padding:12px 16px;margin-bottom:20px;border-radius:6px}.alert-error{background-color:#f8d7da;color:#721c24;border:1px solid #f5c6cb}.study-container{max-width:600px;margin:40px auto;padding:30px;background:#fff;border-radius:8px;box-shadow:0 2px 8px #0000001a}.study-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:30px;padding-bottom:20px;border-bottom:1px solid #e0e0e0}.study-header h1{margin:0;font-size:24px;color:#333}.study-status{display:inline-block;padding:4px 12px;font-size:12px;font-weight:600;text-transform:uppercase;border-radius:12px}.study-status--complete{background-color:#d4edda;color:#155724}.study-status--pending{background-color:#fff3cd;color:#856404}.study-status--in_progress{background-color:#cce5ff;color:#004085}.study-details{margin-bottom:30px}.study-detail{display:flex;justify-content:space-between;padding:12px 0;border-bottom:1px solid #f0f0f0}.study-detail:last-child{border-bottom:none}.study-detail-label{color:#666;font-weight:500}.study-detail-value{color:#333}.btn-viewer{display:block;box-sizing:border-box;width:100%;padding:14px 24px;font-weight:600;text-align:center;background-color:#28a745;color:#fff;transition:background-color .2s}.btn-viewer:hover{background-color:#218838}