body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #121212;
    color: #ffffff;
    transition: background-color 0.3s, color 0.3s;
}
.light-mode {
    background-color: #f0f0f0;
    color: #000000;
}
header.hero {
    text-align: center;
    padding: 30px;
    background: linear-gradient(135deg, #2980b9, #2c3e50);
}
header .avatar img {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    margin-bottom: 15px;
    border: 3px solid #fff;
}
button#modeToggle, .btn, form button {
    background-color: #3498db;
    border: none;
    padding: 10px 20px;
    color: #fff;
    border-radius: 5px;
    cursor: pointer;
    margin: 10px;
    display: inline-block;
    text-decoration: none;
}
.container {
    width: 90%;
    margin: auto;
    padding: 20px;
}
.skills-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    justify-content: center;
}
.skill-card {
    background: #34495e;
    padding: 15px;
    border-radius: 8px;
    flex: 1 1 150px;
    text-align: center;
    transition: transform 0.3s;
}
.skill-card:hover {
    transform: translateY(-5px);
}
.light-mode .skill-card {
    background: #e0e0e0;
}
.graphics {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}
.graphics img {
    width: 250px;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.3);
}
form {
    display: flex;
    flex-direction: column;
    max-width: 500px;
    margin: auto;
}
form input, form textarea {
    margin-bottom: 10px;
    padding: 10px;
    border: none;
    border-radius: 5px;
}
footer {
    background: #2c3e50;
    text-align: center;
    padding: 15px;
    color: #fff;
}
.light-mode footer {
    background: #ddd;
    color: #000;
}