* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: sans-serif;
    line-height: 1.6;
    background-color: #f4f6f9;
    color: #333;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    background-color: #1a252f;
    color: #ffffff;
    padding: 20px;
    text-align: center;
}

header h1 {
    font-size: 2.5rem;
}

header p {
    font-style: italic;
    color: #b8c2cc;
}

.main-container {
    display: flex;
    flex: 1;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

nav {
    flex: 0 0 250px;
    background-color: #ffffff;
    padding: 20px;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
    margin-right: 20px;
}

nav ul {
    list-style: none;
}

nav ul li {
    margin-bottom: 10px;
}

nav ul li a {
    display: block;
    padding: 10px;
    color: #2c3e50;
    text-decoration: none;
    border-radius: 4px;
    font-weight: bold;
}

nav ul li a:hover, nav ul li a.active {
    background-color: #3498db;
    color: #ffffff;
}

main {
    flex: 1;
    background-color: #ffffff;
    padding: 30px;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

main h2 {
    color: #2c3e50;
    margin-bottom: 20px;
    border-bottom: 2px solid #ecf0f1;
    padding-bottom: 10px;
}

main p {
    margin-bottom: 15px;
}

main ul {
    margin-left: 20px;
    margin-bottom: 15px;
}

.image-container {
    margin: 20px 0;
    max-width: 100%;
}

.image-container img {
    max-width: 100%;
    height: auto;
    display: block;
    border-radius: 4px;
}

footer {
    background-color: #1a252f;
    color: #ffffff;
    text-align: center;
    padding: 20px;
    font-size: 0.9rem;
    margin-top: auto;
    border-top: 3px solid #3498db;
}

footer p {
    margin: 5px 0;
}