/* General Styles */
body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    color: #333;
    transition: background 0.3s, color 0.3s;
}
header {
    background-color: #003366;
    color: white;
    padding: 20px;
    text-align: center;
}
header button {
    background: #fff;
    color: #003366;
    border: none;
    padding: 10px 15px;
    margin-top: 10px;
    cursor: pointer;
}
nav {
    background: #002244;
    text-align: center;
    padding: 10px;
}
nav ul {
    list-style: none;
    padding: 0;
}
nav ul li {
    display: inline;
    margin: 0 15px;
}
nav ul li a {
    color: white;
    text-decoration: none;
    font-weight: bold;
}
section {
    max-width: 900px;
    margin: 20px auto;
    padding: 20px;
    background: white;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}
h2 {
    color: #003366;
}
.project, article {
    background: #eef;
    padding: 10px;
    margin: 10px 0;
    border-left: 5px solid #003366;
}
.contact a {
    color: #003366;
    text-decoration: none;
    font-weight: bold;
}
footer {
    text-align: center;
    padding: 10px;
    background: #003366;
    color: white;
}

/* Dark Mode */
.dark-mode {
    background-color: #222;
    color: white;
}
.dark-mode header {
    background-color: #111;
}
.dark-mode nav {
    background: #000;
}
.dark-mode section {
    background: #333;
    color: white;
}
.dark-mode .project, .dark-mode article {
    background: #444;
    border-left: 5px solid #bbb;
}
@media screen and (max-width: 768px) {
    nav ul {
        display: flex;
        flex-direction: column;
        padding: 10px;
    }
    nav ul li {
        margin: 5px 0;
        display: block;
        text-align: center;
    }
    section {
        padding: 15px;
    }
    h2 {
        font-size: 1.5rem;
    }
}

/* Mobile Devices (max-width: 480px) */
@media screen and (max-width: 480px) {
    header {
        font-size: 14px;
        padding: 15px;
    }
    nav ul {
        flex-direction: column;
        text-align: center;
    }
    nav ul li {
        display: block;
        padding: 5px 0;
    }
    section {
        padding: 10px;
        margin: 10px;
    }
    h2 {
        font-size: 1.3rem;
    }
    footer {
        padding: 8px;
    }
}