.container {
    max-width: 60rem;
    margin: 0 auto;
    padding: 0 1rem;
}

nav {
    display: flex;
    justify-content: space-between;
}

nav ul {
    display: flex;
    gap: 1rem;
    list-style: none;
    padding: 0;
}

.message-box {
    border: 1px solid;
    padding: 0.5rem 1rem;
    margin: 1rem 0;
}

.message-box-summary {
    font-weight: bold;
}

.message-box-success { border-color: #2e7d32; background: #edf7ed; }
.message-box-info    { border-color: #0288d1; background: #e5f6fd; }
.message-box-warning { border-color: #ed6c02; background: #fff4e5; }
.message-box-error,
.message-box-debug   { border-color: #d32f2f; background: #fdeded; }