.app-container {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 200px;
    background-color: #304156;
    color: white;
    padding: 20px 0;
}

.logo {
    text-align: center;
    font-size: 18px;
    font-weight: bold;
    padding: 15px 0;
    border-bottom: 1px solid #1f2d3d;
}

.menu {
    margin-top: 20px;
}

.menu-item {
    padding: 14px 20px;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 14px;
}

.menu-item:hover {
    background-color: #263445;
}

.menu-item.active {
    background-color: #1890ff;
}

.main-content {
    flex: 1;
    padding: 20px;
    background-color: #f0f2f5;
}

.content-header {
    margin-bottom: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.content-header h2 {
    margin: 0;
    font-size: 20px;
}

.box-card {
    margin-bottom: 20px;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}