The humid air of the city pressed in, even within the confines of the bustling university library. Maria Santos hunched over her textbooks, the weight of looming deadlines heavy on her shoulders. Her dark brown hair, usually meticulously styled, had escaped its confines, framing a face etched with fatigue. She traced a complex diagram in her textbook with a pen, her brow furrowed in concentration. A soft sigh escaped her lips, almost inaudible amidst the quiet murmur of other students.