body {
font-family: 'Roboto', sans-serif;
background-color: #f4f7fa;
color: #333;
margin: 0;
padding: 0;
display: flex;
justify-content: center;
align-items: center;
min-height: 100vh;
line-height: 1.6;
}
.container {
    max-width: 900px;
width: 90%;
background-color: #fff;
padding: 40px 30px;
border-radius: 12px;
box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
margin: 20px auto;
}
h3 {
font-size: 1.8rem;
font-weight: 700;
color: #2c3e50;
margin-bottom: 30px;
text-align: center;
border-bottom: 2px solid #e0e0e0;
padding-bottom: 10px;
}
h4 {
    font-size: 1.4rem;
    font-weight: 600;
    color: #007bff;
    margin-top: 40px;
    margin-bottom: 20px;
}
.section-list {
list-style: none;
padding: 0;
margin: 0;
}
.section-item {
margin-bottom: 20px;
}
.section-item a {
display: block;
padding: 15px 20px;
background-color: #e9f1ff;
border-radius: 8px;
text-decoration: none;
color: #007bff;
font-weight: 500;
transition: background-color 0.3s ease, transform 0.2s ease;
box-shadow: 0 2px 8px rgba(0, 123, 255, 0.1);
}
.section-item a:hover {
background-color: #d4e6ff;
transform: translateY(-2px);
}
.section-item strong {
    display: block;
    font-size: 1.1rem;
    color: #2c3e50;
    margin-bottom: 5px;
}
.resource-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.resource-item {
    margin-bottom: 20px;
    background-color: #e9f1ff;
    border-radius: 8px;
    padding: 15px 20px;
    box-shadow: 0 2px 8px rgba(0, 123, 255, 0.1);
}

.resource-item summary {
    font-weight: 500;
    color: #2c3e50;
    cursor: pointer;
    outline: none;
}

.resource-item details[open] summary {
    margin-bottom: 10px;
}

.resource-item iframe {
    width: 100%;
    height: 315px;
    border: none;
    border-radius: 8px;
}

.resource-item a {
    color: #007bff;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.resource-item a:hover {
    color: #0056b3;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 10px;
    margin-bottom: 20px;
}

table th, table td {
    border: 1px solid #e0e0e0;
    padding: 10px;
    text-align: left;
}

table th {
    background-color: #f8f9fa;
    font-weight: 600;
}
.back-link {
display: block;
text-align: center;
margin-top: 30px;
}
.back-link a {
display: inline-block;
padding: 10px 20px;
background-color: #6c757d;
color: #fff;
text-decoration: none;
border-radius: 6px;
font-weight: 500;
transition: background-color 0.3s ease;
}
.back-link a:hover {
background-color: #5a6268;
}
@media (max-width: 600px) {
.container {
    padding: 20px 15px;
    width: 95%;
}
h3 {
    font-size: 1.5rem;
}
h4 {
    font-size: 1.2rem;
}
.section-item a {
    padding: 12px 15px;
}
.section-item strong {
    font-size: 1rem;
}
.resource-item {
    padding: 12px 15px;
}
.resource-item iframe {
    height: 200px;
}
}