.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: 200px;
    height: 100vh;
    background: #2c3e50;
    padding: 16px 0;
    box-shadow: 2px 0 8px rgba(0,0,0,0.2);
    z-index: 1000;
}

.sidebar h3 {
    color: #fff;
    text-align: center;
    margin: 16px 0;
    font-size: 1.1em;
}

.sidebar ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.sidebar li {
    margin: 0;
}

.sidebar a {
    display: block;
    padding: 12px 16px;
    color: #ecf0f1;
    text-decoration: none;
    border-left: 4px solid transparent;
    transition: all 0.3s;
}

.sidebar a:hover {
    background: #34495e;
    border-left-color: #1976d2;
    padding-left: 20px;
}

.sidebar a.active {
    background: #1976d2;
    border-left-color: #fff;
    color: #fff;
}

#app {
    padding: 32px;
    min-height: 100vh;
}