* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
    background-color: #f4f6f8;
    color: #333;
    line-height: 1.6;
}

/* Header */
header {
    background-color: #1f3c5b;
    color: white;
    text-align: center;
    padding: 40px 20px;
    margin-bottom: 0;
}

header h1 {
    margin: 0 0 10px;
    font-size: 36px;
}

header p {
    margin: 0;
    font-size: 18px;
}

/* Navigation */
nav {
    background-color: #162c43;
    text-align: center;
    padding: 15px;
}

nav a {
    color: white;
    text-decoration: none;
    margin: 0 15px;
    font-weight: bold;
}

nav a:hover {
    text-decoration: underline;
}

/* Main layout */
main {
    max-width: 1000px;
    margin: 40px auto;
    padding: 0 25px;
}

/* Sections */
section {
    background-color: white;
    padding: 30px;
    margin-bottom: 30px;
    border: 1px solid #ddd;
    border-radius: 10px;
}

section h2 {
    color: #1f3c5b;
    margin-top: 0;
    border-bottom: 2px solid #ddd;
    padding-bottom: 10px;
}

/* Video */
article {
    text-align: center;
    padding: 20px 0;
}

video {
    max-width: 100%;
    height: auto;
    border: 3px solid #1f3c5b;
    border-radius: 8px;
}

/* Audio */
figure {
    text-align: center;
    margin: 20px 0;
    padding: 20px;
    background-color: #f1f4f7;
    border: 1px solid #ccc;
    border-radius: 8px;
}

audio {
    width: 100%;
    max-width: 600px;
}

figcaption {
    margin-top: 12px;
    font-style: italic;
    color: #555;
}

/* Aside */
aside {
    background-color: #e8f0f7;
    padding: 25px;
    margin-top: 30px;
    border-left: 5px solid #1f3c5b;
    border-radius: 5px;
}

aside h2 {
    margin-top: 0;
    color: #1f3c5b;
}

/* Footer */
footer {
    background-color: #162c43;
    color: white;
    text-align: center;
    padding: 20px;
    margin-top: 40px;
}

footer p {
    margin: 0;
}