:root {
    --sidebar-width: 280px;
    --dark-bg: #1a1a1a;
    --darker-bg: #141414;
    --card-bg: #242424;
    --hover-bg: #2d2d2d;
    --border-color: #333;
    --text-primary: #e1e1e1;
    --text-secondary: #999;
    --accent-color: #3498db;
    --success-color: #2ecc71;
    --warning-color: #f1c40f;
    --danger-color: #e74c3c;
}

body {
    background-color: var(--dark-bg);
    color: var(--text-primary);
}

.wrapper {
    display: flex;
    min-height: 100vh;
    background-color: var(--darker-bg);
}

.sidebar {
    width: var(--sidebar-width);
    background: var(--card-bg);
    color: #fff;
    position: fixed;
    height: 100vh;
    transition: all 0.3s ease;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--border-color) var(--card-bg);
    border-right: 1px solid var(--border-color);
}

.sidebar::-webkit-scrollbar {
    width: 6px;
}

.sidebar::-webkit-scrollbar-track {
    background: var(--card-bg);
}

.sidebar::-webkit-scrollbar-thumb {
    background-color: var(--border-color);
    border-radius: 6px;
    border: 2px solid var(--card-bg);
}

.sidebar::-webkit-scrollbar-thumb:hover {
    background-color: var(--text-secondary);
}

.main-content {
    margin-left: var(--sidebar-width);
    width: calc(100% - var(--sidebar-width));
    transition: all 0.3s ease;
    background-color: var(--dark-bg);
}

.sidebar-header {
    padding: 20px;
    background: var(--darker-bg);
}

.sidebar-menu {
    padding: 20px 0;
}

.menu-section {
    margin-bottom: 15px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
}

.menu-section-title {
    padding: 10px 20px;
    font-size: 0.8rem;
    text-transform: uppercase;
    color: var(--text-secondary);
    font-weight: 600;
    letter-spacing: 0.5px;
}

.menu-item {
    padding: 12px 20px;
    color: var(--text-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    transition: all 0.3s ease;
}

.menu-item:hover {
    background: var(--hover-bg);
    color: var(--accent-color);
    text-decoration: none;
    padding-left: 25px;
}

.menu-item i {
    margin-right: 10px;
    width: 20px;
    text-align: center;
}

.content-header {
    background: var(--card-bg);
    padding: 20px;
    box-shadow: 0 2px 15px rgba(0,0,0,0.05);
    border-bottom: 1px solid var(--border-color);
}

.chat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    padding: 20px;
}

.chat-card {
    background: var(--card-bg);
    border-radius: 10px;
    box-shadow: 0 2px 15px rgba(0,0,0,0.05);
    transition: transform 0.3s ease;
    border: 1px solid var(--border-color);
}

.chat-card:hover {
    background: var(--hover-bg);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

.badge-custom {
    padding: 5px 10px;
    border-radius: 6px;
    font-size: 12px;
    border: 1px solid var(--border-color);
}

.user-profile {
    padding: 20px;
    border-top: 1px solid var(--border-color);
    margin-top: auto;
    background: var(--darker-bg);
}

.active {
    background: var(--hover-bg);
    border-left: 4px solid var(--accent-color);
}

.navbar-custom {
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
    padding: 1rem;
    box-shadow: 0 2px 15px rgba(0,0,0,0.1);
}

.navbar-brand {
    font-weight: 600;
    font-size: 1.25rem;
}

.nav-link {
    padding: 0.5rem 1rem;
    font-weight: 500;
}

.dropdown-menu {
    border: none;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    border-radius: 10px;
}

.dropdown-item {
    padding: 0.75rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.dropdown-item:hover {
    background-color: var(--hover-bg);
}

.badge {
    padding: 0.5rem 1rem;
    font-weight: 500;
    border: none;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
}

/* Mobile Detection Below */

/* Mobile Responsiveness */
@media (max-width: 768px) {
    .wrapper {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        position: relative;
        height: auto;
        padding: 1rem;
    }
    
    .main-content {
        margin-left: 0;
        width: 100%;
    }
    
    .chat-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
        padding: 1rem;
    }
    
    .chat-card {
        margin-bottom: 1rem;
    }
    
    .sidebar-menu {
        display: flex;
        flex-wrap: wrap;
        gap: 0.5rem;
    }
    
    .menu-section {
        width: 100%;
    }
    
    .menu-item {
        padding: 0.5rem;
    }
    
    .content-header {
        padding: 1rem;
    }
}

/* Touch-friendly improvements */
@media (hover: none) {
    .menu-item:hover {
        background-color: transparent;
    }
    
    .menu-item:active {
        background-color: rgba(255, 255, 255, 0.1);
    }
}

.chat-section {
    background: var(--card-bg);
    border-radius: 12px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
}

.chat-section-header {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.chat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    padding: 1.5rem;
}

.chat-card {
    background: var(--card-bg);
    border-radius: 8px;
    transition: transform 0.2s, box-shadow 0.2s;
    border: 1px solid var(--border-color);
}

.chat-card:hover {
    background: var(--hover-bg);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

.chat-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.badge-custom {
    padding: 0.5rem 0.8rem;
    font-size: 0.75rem;
}

.alert {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn-primary {
    background: var(--accent-color);
    border: none;
}

.btn-primary:hover {
    background: #2980b9;
}

/* Custom scrollbar for dark theme */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--dark-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* Glow effects for interactive elements */
.chat-card:hover .btn-primary {
    box-shadow: 0 0 15px rgba(52, 152, 219, 0.3);
}

/* Status indicators */
.status-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    display: inline-block;
    margin-right: 6px;
}

.status-online {
    background: var(--success-color);
    box-shadow: 0 0 8px rgba(46, 204, 113, 0.4);
}

.status-offline {
    background: var(--text-secondary);
}