/* General Styles */
:root {
    --primary-color: #4CAF50; /* Green */
    --secondary-color: #2196F3; /* Blue */
    --accent-color: #FFC107; /* Amber */
    --text-color: #333;
    --bg-color: #f4f7f6;
    --sidebar-bg: #2c3e50; /* Dark Blue Grey */
    --sidebar-text: #ecf0f1;
    --card-bg: #ffffff;
    --border-color: #e0e0e0;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    display: flex;
    min-height: 100vh;
}

.container {
    display: flex;
    width: 100%;
}

/* Sidebar */
.sidebar {
    width: 250px;
    background-color: var(--sidebar-bg);
    color: var(--sidebar-text);
    padding: 20px;
    display: flex;
    flex-direction: column;
    box-shadow: 2px 0 5px rgba(0, 0, 0, 0.1);
}

.sidebar .logo {
    text-align: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar .logo h2 {
    font-size: 2em;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.sidebar .logo span {
    font-size: 0.9em;
    color: var(--sidebar-text);
    display: block;
}

.sidebar .menu {
    flex-grow: 1;
}

.sidebar .menu-item {
    display: flex;
    align-items: center;
    padding: 12px 15px;
    margin-bottom: 10px;
    color: var(--sidebar-text);
    text-decoration: none;
    border-radius: 8px;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.sidebar .menu-item:hover,
.sidebar .menu-item.active {
    background-color: var(--primary-color);
    color: white;
}

.sidebar .menu-item .icon {
    margin-right: 10px;
    /* Placeholder for actual icons */
    width: 20px;
    height: 20px;
    background-color: rgba(255, 255, 255, 0.3);
    border-radius: 3px;
}

/* Main Content */
.main-content {
    flex-grow: 1;
    padding: 20px;
    display: flex;
    flex-direction: column;
}

.main-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: var(--card-bg);
    padding: 15px 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    margin-bottom: 20px;
}

.main-header h1 {
    font-size: 1.8em;
    color: var(--text-color);
}

.main-header .user-info {
    display: flex;
    align-items: center;
}

.main-header .user-info span {
    margin-right: 10px;
    font-weight: 500;
}

.main-header .user-info img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--primary-color);
}

#content-area {
    flex-grow: 1;
    background-color: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        height: auto;
        padding: 15px;
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
    }

    .sidebar .logo {
        margin-bottom: 0;
        border-bottom: none;
    }

    .sidebar .menu {
        display: none; /* Hide menu on small screens, will be toggled by JS */
    }

    .main-content {
        padding: 15px;
    }

    .main-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .main-header h1 {
        margin-bottom: 10px;
    }
}