body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    margin: 0;
    padding: 0;
}

header {
    padding: 1rem;
    border-bottom: 1px solid #ddd;
}

main {
    padding: 1rem;
}

.mail-topics .topic {
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid #ccc;
}

.topic-entry {
    border: 1px solid #eee;
    padding: 0.75rem;
    margin-bottom: 0.75rem;
}

.entry-meta {
    font-size: 0.9rem;
    color: #555;
}

.entry-title {
    margin: 0.2rem 0 0.5rem;
}

.entry-tasks ul {
    margin: 0.3rem 0 0.5rem 1.2rem;
}

.entry-reply summary {
    cursor: pointer;
}