:root {
    --background-color: #121212;
    --text-color: #ffffff;
    --header-footer-bg: #1f1f1f;
    --link-color: #00ff00;
    --link-hover-color: #ff0000;
    --button-bg: #00ff00;
    --button-hover-bg: #00cc00;
}

body.light-mode {
    --background-color: #ffffff;
    --text-color: #000000;
    --header-footer-bg: #f4f4f4;
    --link-color: #007bff;
    --link-hover-color: #0056b3;
    --button-bg: #007bff;
    --button-hover-bg: #0056b3;
}

body {
    font-family: 'Roboto', sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--background-color);
    color: var(--text-color);
}

header {
    background-color: var(--header-footer-bg);
    color: var(--text-color);
    padding: 1rem 0;
    text-align: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

header p {
    margin: 0.5rem 0;
}

nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    justify-content: center;
}

nav ul li {
    margin: 0 1rem;
}

nav ul li a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: bold;
    transition: color 0.3s;
}

nav ul li a:hover {
    color: var(--link-color);
}

main {
    padding: 2rem;
}

section {
    margin: 2rem 0;
    background-color: var(--header-footer-bg);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
}

.profile-img {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    display: block;
    margin: 0 auto 1rem auto;
}

.project {
    margin-bottom: 1rem;
}

h1, h2, h3 {
    margin: 0 0 1rem 0;
}

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

form label {
    margin-bottom: 0.5rem;
}

form input, form textarea {
    margin-bottom: 1rem;
    padding: 0.5rem;
    border: 1px solid #ccc;
    border-radius: 4px;
    background-color: #333;
    color: #fff;
}

form button {
    padding: 0.5rem;
    border: none;
    border-radius: 4px;
    background-color: var(--button-bg);
    color: #333;
    cursor: pointer;
    transition: background-color 0.3s;
}

form button:hover {
    background-color: var(--button-hover-bg);
}

footer {
    text-align: center;
    padding: 1rem 0;
    background-color: var(--header-footer-bg);
    color: var(--text-color);
    box-shadow: 0 -2px 4px rgba(0, 0, 0, 0.2);
}

.project a {
    color: var(--link-color);
    text-decoration: none;
    transition: color 0.3s;
}

.project a:hover {
    color: var(--link-hover-color);
    text-decoration: underline;
}

.blog-content {
    margin-top: 2rem;
    padding: 1rem;
    background-color: #2a2a2a;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background-color: var(--button-bg);
    color: #333;
    text-decoration: none;
    border-radius: 4px;
    transition: background-color 0.3s;
    cursor: pointer;
}

.btn:hover {
    background-color: var(--button-hover-bg);
}