body {
    margin: 0;
    font-family: sans-serif;
    background: #f4f4f4;
    color: #222;
}

nav {
    width: 220px;
    background: #425f7e;
    color: #fff;
    float: left;
    min-height: 100vh;
}

nav h1 {
    font-size: 1.2em;
    text-align: center;
    padding: 1em 0;
    border-bottom: 1px solid #4d6782;
    }

nav a {
    padding: 0.8em 1em;
    color: #ccc;
    text-decoration: none;
    display: block;
}

nav a.active,
nav a:hover {
    background: #4d6782;
    color: #fff;
}

header {
    background: #fff;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    padding: 1em;
}

header h2 {
    margin: 0;
    font-size: 1.4em;
}

main {
    margin-left: 220px;
    padding: 1em;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: #fff;
    border-radius: 6px;
    overflow: hidden;
}

th, td {
    padding: 0.6em;
    border-bottom: 1px solid #ddd;
    text-align: left;
}

th {
    background: #eee;
}

button {
    border: none;
    background: #3a3a3a;
    color: #fff;
    padding: 0.4em 0.8em;
    border-radius: 6px;
    cursor: pointer;
}

button:hover {
    background: #868686;
}

.pagination {
    margin-top: 1em;
    text-align: center;
}

.pagination button {
    margin: 0 0.2em;
}

canvas {
    background: #fff;
    border-radius: 6px;
    padding: 1em;
    margin-top: 1em;
}

#status {
    font-size: 0.9em;
    color: #666;
}