body {
    font-family: Arial, sans-serif;
    margin: 0;
    background: #f6f7fb;
}

header {
    background: #0066ff;
    padding: 15px;
    color: white;
    font-size: 20px;
    text-align: center;
}

.button {
    background: #0066ff;
    padding: 10px 20px;
    border-radius: 6px;
    color: white;
    cursor: pointer;
    border: none;
}

.container {
    max-width: 900px;
    margin: auto;
    padding: 20px;
}

.card {
    background: white;
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 15px;
    box-shadow: 0 1px 4px rgba(0,0,0,0.1);
}

.layout {
    display: flex;
    gap: 16px;
    padding: 20px;
}

.sidebar {
    width: 220px;
    background: white;
    padding: 16px;
    border-radius: 10px;
    box-shadow: 0 1px 4px rgba(0,0,0,0.08);
    height: fit-content;
}

.sidebar a {
    display: block;
    margin-bottom: 10px;
    color: #0066ff;
    text-decoration: none;
    font-weight: 600;
}

.sidebar a:hover {
    text-decoration: underline;
}

.content {
    flex: 1;
}