html {
    scroll-behavior: smooth;
}

body {
    font-family: Arial, sans-serif;
    background-color: #eef2f7;
    color: #222;
    margin: 0;
}

header {
    background: linear-gradient(135deg, #2c3e50, #4a69bd);
    color: white;
    padding: 30px;
    text-align: center;
}

header h1,
header h2,
header h3 {
    margin: 10px 0;
}

header h1 {
    font-size: 32px;
    font-weight: bold;
}

header h2 {
    opacity: 0.9;
}

header h3 {
    opacity: 0.8;
}

nav {
    margin-top: 20px;
    text-align: center;
}

nav a {
    display: inline-block;
    margin: 6px;
    padding: 10px 14px;
    background-color: white;
    color: #2c3e50;
    text-decoration: none;
    border-radius: 8px;
    font-weight: bold;
    transition: all 0.2s ease;
}

nav a:hover {
    background-color: #dbe9ff;
    transform: translateY(-2px);
}

main {
    max-width: 1000px;
    margin: 30px auto;
    padding: 20px;
}

section {
    background-color: white;
    margin-bottom: 30px;
    padding: 25px;
    border-radius: 14px;
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.1);
}

h2 {
    color: #2c3e50;
}

h3 {
    color: #4a69bd;
}

ul,
ol {
    padding-left: 25px;
    line-height: 1.6;
}

p {
    line-height: 1.6;
}

img {
    width: 350px;
    max-width: 100%;
    border-radius: 12px;
    border: 2px solid #ddd;
}

video {
    width: 350px;
    max-width: 100%;
    border-radius: 12px;
    border: 2px solid #ddd;
}

audio {
    width: 300px;
    max-width: 100%;
}

details {
    margin-top: 15px;
    padding: 10px;
    background-color: #f7f9fc;
    border-radius: 8px;
}

form {
    background-color: #fcfcfc;
    padding: 20px;
    border-radius: 12px;
    border: 1px solid #ddd;
}

fieldset {
    border: 2px solid #c8d6e5;
    border-radius: 10px;
    padding: 20px;
}

input,
select,
textarea,
button {
    margin-top: 8px;
    margin-bottom: 15px;
    padding: 10px;
    border-radius: 8px;
    border: 1px solid #bbb;
    font-size: 14px;
}

textarea {
    width: 100%;
    max-width: 500px;
}

button {
    background-color: #4a69bd;
    color: white;
    border: none;
    cursor: pointer;
}

button:hover {
    background-color: #3b55a0;
}

footer {
    text-align: center;
    padding: 20px;
    color: #555;
}

@media (max-width: 700px) {
    header {
        padding: 20px;
    }

    nav a {
        display: block;
        width: 80%;
        margin: 8px auto;
        text-align: center;
    }

    main {
        padding: 12px;
    }

    section {
        padding: 18px;
    }
}