* {
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background-color: #f4f4f9;
    color: #333;
}

header {
    background: #2c3e50;
    color: #ffffff;
    padding: 20px 0;
    text-align: center;
}

header h1 {
    margin-top: 0;
}

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

header nav li {
    display: inline;
    margin: 0 15px;
}

header nav a {
    color: #ffffff;
    text-decoration: none;
    font-weight: bold;
    transition: color 0.3s ease;
}

header nav a:hover {
    color: #18bc9c;
}


main {
    padding: 20px;
    max-width: 800px;
    margin: 30px auto;
    background: #ffffff;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    border-radius: 8px;
}

section {
    margin-bottom: 40px;
}

section h2 {
    border-bottom: 2px solid #2c3e50;
    padding-bottom: 10px;
    color: #2c3e50;
}


#about {
    text-align: center;
}

#about img {
    border-radius: 50%;
    display: block;
    margin: 0 auto 20px;
    border: 3px solid #2c3e50;
    width: 150px;
    height: 150px;
    object-fit: cover;
}

ul {
    padding-left: 20px;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

table, th, td {
    border: 1px solid #ddd;
}

th, td {
    padding: 12px;
    text-align: left;
}

th {
    background-color: #2c3e50;
    color: white;
}

tr:nth-child(even) {
    background-color: #f2f2f2;
}

footer {
    background: #2c3e50;
    color: #ffffff;
    text-align: center;
    padding: 30px 20px;
    margin-top: 40px;
}

footer h2 {
    margin-top: 0;
    font-size: 1.5rem;
}

footer p {
    margin-bottom: 15px;
}

footer ul {
    list-style: none;
    padding: 0;
    display: flex;
    justify-content: center;
    gap: 20px;
}

footer a {
    color: #18bc9c;
    text-decoration: none;
    font-weight: bold;
    transition: color 0.3s ease;
}

footer a:hover {
    color: #ffffff;
    text-decoration: underline;
}