body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
}

.page-container {
    width: 90%;
    max-width: 1000px;
    margin: 20px auto;
    padding: 20px;
    box-sizing: border-box;
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.page-container.has-figure {
    display: grid;
    grid-template-columns: minmax(180px, 1fr) minmax(0, 2fr);
    gap: 20px;
    align-items: start;
}

.page-figure {
    display: flex;
    justify-content: center;
    margin: 0;
}

.page-figure img {
    width: 100%;
    max-width: 300px;
    height: auto;
    border-radius: 8px;
    object-fit: cover;
}

.page-content {
    min-width: 0;
}

.course-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 18px;
    padding: 0 0 14px;
    margin: 0 0 24px;
    border-bottom: 1px solid #e5e5e5;
}

.course-nav a {
    color: #007bff;
    text-decoration: none;
}

.course-nav a:hover,
.course-nav a:focus-visible {
    text-decoration: underline;
}

.text {
    min-width: 0;
    color: #333;
}

.text h1,
.text h2,
.text h3 {
    color: #333;
}

.text h1 {
    font-size: 2em;
    margin: 0 0 20px;
}

.text h2 {
    font-size: 1.5em;
    margin: 28px 0 12px;
}

.text h3 {
    font-size: 1.2em;
}

.text p {
    font-size: 1.1em;
    color: #555;
    line-height: 1.6;
}

.text ul,
.text ol {
    margin-left: 20px;
    padding-left: 0;
}

.text li {
    font-size: 1em;
    color: #333;
    line-height: 1.5;
    margin-bottom: 10px;
}

.text a {
    color: #007bff;
    text-decoration: none;
}

.text a:hover,
.text a:focus-visible {
    text-decoration: underline;
}

.table-wrap {
    overflow-x: auto;
    margin: 16px 0 24px;
}

.text table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

.text th,
.text td {
    padding: 9px 12px;
    border: 1px solid #d8d8d8;
    vertical-align: top;
}

.text thead th {
    background-color: #007bff;
    color: #fff;
}

.text tbody tr:nth-child(even) {
    background-color: #f2f2f2;
}

.text caption {
    text-align: left;
    font-weight: bold;
    padding: 0 0 8px;
}

@media (max-width: 768px) {
    .page-container {
        padding: 15px;
    }

    .page-container.has-figure {
        grid-template-columns: 1fr;
    }

    .page-figure img {
        max-width: 240px;
    }

    .text h1 {
        font-size: 1.5em;
    }

    .text p {
        font-size: 1em;
    }

    .text li {
        font-size: 0.95em;
    }
}

@media (max-width: 480px) {
    .page-container {
        width: 100%;
        margin: 0;
        border-radius: 0;
    }

    .text h1 {
        font-size: 1.4em;
    }

    .text h2 {
        font-size: 1.2em;
    }

    .text p {
        font-size: 0.95em;
    }
}