body { font-family: sans-serif; margin: 20px; background-color: #f4f4f4; }
h1, h2 { color: #333; }
#auth-section, #app-section { background-color: #fff; padding: 20px; margin-bottom: 20px; border-radius: 8px; box-shadow: 0 0 10px rgba(0,0,0,0.1); }
input[type="email"], input[type="password"], input[type="text"], input[type="number"] {
    padding: 10px; margin-bottom: 10px; border: 1px solid #ddd; border-radius: 4px; width: calc(100% - 22px);
}
button {
    padding: 10px 15px; background-color: #007bff; color: white; border: none; border-radius: 4px; cursor: pointer; margin-right: 5px;
}
button:hover { background-color: #0056b3; }
#logout-btn { background-color: #dc3545; }
#logout-btn:hover { background-color: #c82333; }
ul { list-style-type: none; padding: 0; }
li {
    background-color: #e9ecef; padding: 15px; margin-bottom: 10px; border-radius: 4px;
    display: flex; justify-content: space-between; align-items: center;
}
li span { flex-grow: 1; }
li button { background-color: #ffc107; }
li button:hover { background-color: #e0a800; }
#auth-status { font-style: italic; color: #666; }
hr { margin-top: 20px; margin-bottom: 20px; border: 0; border-top: 1px solid #eee; }