:root {
    --bg-color: #f4f4f4;
    --text-color: #333;
    --nav-bg: #333;
    --nav-text: #fff;
}

.dark-mode {
    --bg-color: #222;
    --text-color: #ddd;
    --nav-bg: #111;
    --nav-text: #fff;
}

body {
    font-family: 'Arial', sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex; flex-direction: column;
}

.container {
    width: 80%;
    margin: 0 auto;
    padding: 20px;
}

header {
    background-color: #333;
    color: #fff;
    padding: 1rem 0;
    text-align: center;
}

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

nav ul li {
    display: inline;
    margin: 0 1rem;
}

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

main {
    padding: 2rem 0;
}

footer {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 1rem 0;
    position: relative;
    bottom: 0;
    width: 100%;
}

form {
    display: flex;
    flex-direction: column;
}

form label {
    margin-top: 1rem;
}

form input, form textarea {
    margin-top: 0.5rem;
    padding: 0.5rem;
    font-size: 1rem;
}

form input[type="submit"] {
    margin-top: 1rem;
    padding: 0.5rem;
    background-color: #333;
    color: #fff;
    border: none;
    cursor: pointer;
}

img {
    max-width: 100%;
    height: auto;
}

.gallery {
    display: flex;
    flex-wrap: wrap;
}

.gallery-item {
    flex: 1 1 calc(50% - 20px);
    margin: 10px;
}

.blog-posts {
    display: flex;
    flex-direction: column;
}

.blog-post {
    margin-bottom: 20px;
}

.navbar {
    background-color: var(--nav-bg) !important;
}

.navbar a {
    color: var(--nav-text) !important;
}
html, body {
    height: 100%;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
}

@media (max-width: 600px) {
    nav ul li {
        display: block;
        margin: 0.5rem 0;
    }

    .gallery-item {
        flex: 1 1 100%;
    }

    footer {
        position: static;
    }
}