:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --text-color: #333;
    --light-bg: #f8f9fa;
    --border-color: #ddd;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    max-width: 1100px;
    margin: 0 auto;
    padding: 2em;
    background-color: #fff;
}

.profile-picture {
    float: right;
    border: thin solid var(--border-color);
    width: 30%;
    max-width: 300px;
    border-radius: 5px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    margin-left: 2em;
    margin-bottom: 1em;
}

header {
    margin-bottom: 2.5em;
    border-bottom: 2px solid var(--secondary-color);
    padding-bottom: 1.5em;
}

h1 {
    color: var(--primary-color);
    margin-bottom: 0.5em;
    font-size: 2.5em;
}

h2 {
    color: var(--primary-color);
    margin: 1em 0 0.5em 0;
    font-size: 1.5em;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.3em;
}

section {
    margin-bottom: 2em;
    padding: 1em 0;
    border-radius: 5px;
}

ul {
    list-style-type: none;
    padding-left: 0.5em;
}

li {
    margin-bottom: 0.8em;
    padding-left: 1.5em;
    position: relative;
}

li:before {
    content: '•';
    color: var(--secondary-color);
    font-weight: bold;
    position: absolute;
    left: 0;
}

a {
    color: var(--secondary-color);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: #1a5276;
    text-decoration: underline;
}

footer {
    margin-top: 2em;
    text-align: center;
    font-size: 0.9em;
    color: #666;
    padding: 1em;
    border-top: 1px solid var(--border-color);
}

@media (max-width: 768px) {
    body {
    padding: 1em;
    }

    .profile-picture {
    float: none;
    display: block;
    margin: 0 auto 1.5em;
    width: 60%;
    }

    section {
    padding: 1em;
    }
}