* {
    box-sizing: border-box;
}

body {
    font-family: system-ui, -apple-system, Arial, sans-serif;
    margin: 0;
    padding: 0;
}

nav {
    padding: 12px 16px;
    border-bottom: 1px solid #eee;
}

nav a {
    margin-right: 12px;
    text-decoration: none;
}

.container {
    max-width: 900px;
    margin: 24px auto;
    padding: 0 16px;
}

h1 {
    margin: 16px 0;
}

button {
    cursor: pointer;
}

.flash {
    padding: 10px 12px;
    border: 1px solid #ddd;
    background: #fafafa;
    margin: 12px 0;
}

.protected {
    color: #0a8;
    font-weight: 600;
}