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

.header {
    width: 100%;
    height: 100px;
    background: #2a4d69;
    color: white;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 34px;
    letter-spacing: 3px;
    font-weight: bold;
}

.container {
    display: flex;
    height: calc(100vh - 200px);
}

.sidebar {
    width: 30%;
    background: #f1f1f1;
    border-right: 2px solid #ccc;
    overflow-y: auto;
    padding: 15px;
}

.content {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
}

ul {
    list-style: none;
    padding-left: 20px;
}

li.folder {
    cursor: pointer;
    font-weight: bold;
    margin: 5px 0;
}

li.file {
    cursor: pointer;
    margin-left: 20px;
}

li ul {
    display: none;
}

.file.active {
    background: #F54927;
    border-radius: 4px;
    padding: 2px 4px;
}