:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --sidebar-bg: #1e293b;
    --sidebar-hover: #334155;
    --sidebar-text: #e2e8f0;
    --body-bg: #f8fafc;
    --card-bg: #ffffff;
    --text-main: #334155;
    --text-muted: #64748b;
    --transition-speed: 0.3s;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--body-bg);
    color: var(--text-main);
    overflow-x: hidden;
}

/* Wrapper and Layout */
#wrapper {
    display: flex;
    width: 100%;
    min-height: 100vh;
}

/* Sidebar Styling */
#sidebar {
    width: 260px;
    background: var(--sidebar-bg);
    color: var(--sidebar-text);
    transition: all var(--transition-speed);
    display: flex;
    flex-direction: column;
    box-shadow: 4px 0 10px rgba(0,0,0,0.05);
    z-index: 1000;
}

#sidebar .sidebar-header {
    padding: 20px;
    background: rgba(0, 0, 0, 0.1);
    text-align: center;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

#sidebar .sidebar-header h3 {
    margin: 0;
    font-weight: 700;
    font-size: 1.25rem;
    color: #fff;
    letter-spacing: 0.5px;
}

#sidebar .sidebar-header span {
    color: var(--primary-color);
}

.sidebar-menu {
    list-style: none;
    padding: 10px 0;
    margin: 0;
    flex-grow: 1;
}

.sidebar-menu li {
    padding: 5px 20px;
}

.sidebar-menu li a {
    display: flex;
    align-items: center;
    color: var(--sidebar-text);
    text-decoration: none;
    padding: 12px 15px;
    border-radius: 8px;
    transition: all var(--transition-speed);
    font-weight: 500;
}

.sidebar-menu li a i {
    width: 24px;
    font-size: 1.1rem;
    margin-right: 10px;
    text-align: center;
    transition: transform var(--transition-speed);
}

.sidebar-menu li a:hover, 
.sidebar-menu li a.active {
    background: var(--primary-color);
    color: #fff;
    box-shadow: 0 4px 10px rgba(37, 99, 235, 0.2);
}

.sidebar-menu li a:hover i {
    transform: translateX(3px);
}

/* Main Content Area */
#content {
    flex-grow: 1;
    min-width: 0; 
    display: flex;
    flex-direction: column;
    transition: all var(--transition-speed);
}

/* Navbar */
.top-navbar {
    background: var(--card-bg);
    box-shadow: 0 2px 10px rgba(0,0,0,0.03);
    padding: 15px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 100;
}

.navbar-brand-text {
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--text-main);
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
}

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

/* Content Body */
.content-body {
    padding: 30px;
    flex-grow: 1;
}

/* Cards */
.custom-card {
    background: var(--card-bg);
    border: none;
    border-radius: 12px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.02);
    transition: transform 0.2s, box-shadow 0.2s;
}

.custom-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.05);
}

.card-header-custom {
    background: transparent;
    border-bottom: 1px solid rgba(0,0,0,0.05);
    padding: 20px 25px;
    font-weight: 600;
    font-size: 1.1rem;
}

/* Buttons */
.btn-primary-custom {
    background: var(--primary-color);
    border: none;
    padding: 10px 20px;
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.2s;
}

.btn-primary-custom:hover {
    background: var(--primary-hover);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

/* Glassmorphism effects for specific areas */
.glass-panel {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

/* Utilities */
.text-gradient {
    background: linear-gradient(90deg, var(--primary-color), #8b5cf6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Sidebar Logo */
.sidebar-logo {
    max-width: 140px;
    height: auto;
    margin-bottom: 5px;
}

/* --- Responsive Media Queries --- */
@media (max-width: 768px) {
    #sidebar {
        position: fixed;
        left: -260px;
        height: 100vh;
        z-index: 1050;
    }
    
    #sidebar.active {
        left: 0;
        box-shadow: 10px 0 20px rgba(0,0,0,0.5);
    }
    
    /* Overlay for mobile */
    .sidebar-overlay {
        display: none;
        position: fixed;
        width: 100vw;
        height: 100vh;
        background: rgba(0, 0, 0, 0.5);
        z-index: 1040;
        top: 0;
        left: 0;
    }
    
    .sidebar-overlay.active {
        display: block;
    }

    #content {
        width: 100%;
        padding: 0;
        margin-left: 0;
    }
    
    .top-navbar {
        padding: 10px 15px;
    }
    
    .content-body {
        padding: 15px;
    }

    .card-header-custom {
        padding: 15px;
    }
}