body {
    margin: 0;
    font-family: 'Helvetica Neue', sans-serif;
    background-color: #f2f2f2;
    color: #333;
    line-height: 1.6;
}
header {
    text-align: center;
    padding: 3rem 1rem 2rem;
}
header .logo {
    width: 140px;
    height: auto;
    margin-bottom: 1rem;
}
header h1 {
    margin: 0;
    font-size: 2.5rem;
    color: #4e7c59;
}
header p {
    max-width: 600px;
    margin: 1rem auto 0;
    font-size: 1rem;
}
footer {
    text-align: center;
    padding: 1rem;
    font-size: 0.9rem;
    background-color: #e8ede4;
    color: #4e7c59;
}

.topics {
    max-width: 720px;
    margin: 2rem auto;
    padding: 0 1rem;
}
.topics h2 {
    font-size: 1.5rem;
    color: #4e7c59;
    border-bottom: 2px solid #cbd5c0;
    padding-bottom: 0.3rem;
    margin-bottom: 1rem;
}
.topics article {
    margin-bottom: 1.5rem;
}
.topics h3 {
    margin: 0 0 0.3rem;
    font-size: 1.1rem;
    color: #2f4f3a;
}
.topics p {
    margin: 0;
    font-size: 0.95rem;
    color: #444;
}

.projects {
    max-width: 720px;
    margin: 2rem auto;
    padding: 0 1rem;
}
.projects h2 {
    font-size: 1.5rem;
    color: #4e7c59;
    border-bottom: 2px solid #cbd5c0;
    padding-bottom: 0.3rem;
    margin-bottom: 1rem;
}
.projects ul {
    list-style: none;
    padding: 0;
}
.projects li {
    margin-bottom: 1rem;
}
.projects a {
    text-decoration: none;
    color: #2f4f3a;
    font-size: 1.05rem;
}
.projects a:hover {
    text-decoration: underline;
}