:root {
    --primary-bg: #5f79a0;
    --day-cell-bg: #e4eef8;
    --text-color: white;
}

body {
    font-family: "Times New Roman", serif;
    text-align: center;
    margin: 0;
    padding: 0;
}

.header-table, .schedule-table, .friday-table {
    width: 75%;
    margin: 0 auto;
    border-collapse: collapse;
}

.deprt-info, .year-info {
    border: 1px solid black;
    padding: 15px;
    text-align: center;
}

.logo {
    width: 100%;
    max-width: 333px;
    height: auto;
    aspect-ratio: 333/115;
}

.separator {
    width: 75%;
    border: 0.1em solid black;
    margin: 1em auto;
}

.schedule-header td {
    background-color: var(--primary-bg);
    color: var(--text-color);
    font-family: "Optima", sans-serif;
    text-align: center;
    padding: 8px;
    height: 50px;
}

.schedule-header td:first-child {
    background-color: var(--primary-bg);
    width: 50px;
}

.schedule-table, .friday-table {
    margin-top: 20px;
    table-layout: fixed;
}

.schedule-table td, .friday-table td {
    border: 1px solid black;
    text-align: center;
    padding: 8px;
    height: 50px;
}

.day-cell {
    background-color: var(--day-cell-bg);
    font-weight: bold;
    position: relative;
    height: 75px;
}

.day-name {
    position: absolute;
    left: 50%;
    top: 50%;
    font-size: clamp(10px, 2vw, 12px);
    transform: translate(-50%, -50%) rotate(-90deg);
    white-space: nowrap;
}

.course {
    padding: 10px;
    text-align: center;
    font-size: clamp(12px, 2vw, 14px);
}

.black-cell {
    background-color: black;
}

.empty-cell {
    border: 1px solid black;
    width: 50px;
    height: 50px;
}