body {
    margin: 0;
    font-family: "Sarabun", sans-serif;
    background: #f4f6f9;
}

.top-header {
    background: linear-gradient(to right, #003366, #00509e);
    color: white;
    text-align: center;
    padding: 20px;
}

.banner {
    width: 100%;
    height: 250px;
    object-fit: cover;
}

nav {
    background: #c40000;
    text-align: center;
}

nav a {
    color: white;
    padding: 15px 20px;
    display: inline-block;
    text-decoration: none;
}

nav a:hover {
    background: #8b0000;
}

.container {
    display: flex;
    padding: 20px;
    gap: 20px;
}

aside.left, aside.right {
    width: 20%;
}

main {
    width: 60%;
}

.card {
    background: white;
    padding: 15px;
    margin-bottom: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

ul {
    list-style: none;
    padding: 0;
}

ul li {
    padding: 5px 0;
}

ul li a {
    text-decoration: none;
    color: #003366;
}

.btn-red {
    background: #c40000;
    color: white;
    padding: 10px 15px;
    border: none;
    border-radius: 5px;
}

.button-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
}

.btn {
    padding: 10px;
    text-align: center;
    color: white;
    border-radius: 5px;
    text-decoration: none;
}

.blue { background: #007bff; }
.red { background: #dc3545; }
.green { background: #28a745; }
.orange { background: #fd7e14; }
.teal { background: #20c997; }
.purple { background: #6f42c1; }
.pink { background: #e83e8c; }
.cyan { background: #17a2b8; }
.dark { background: #343a40; }

.btn-full {
    width: 100%;
    padding: 10px;
    margin-bottom: 8px;
    border: none;
    color: white;
    border-radius: 5px;
}

/* Responsive */
@media(max-width: 900px){
    .container {
        flex-direction: column;
    }
    aside.left, aside.right, main {
        width: 100%;
    }
}
.container main .card .card h2 strong {
	color: #F00;
}