:root {
    --primary-color: #2c3e50;
    --secondary-color: #34495e;
    --accent-color: #3498db;
    --bg-color: #f4f6f9;
    --text-color: #333333;
    --text-muted: #6c757d;
    --card-bg: #ffffff;
    --border-color: #e9ecef;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Inter', 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    font-size: 14px;
    line-height: 1.6;
}

.navbar-brand {
    font-weight: 700;
    letter-spacing: 0.5px;
}

/* Sidebar Styling */
.sidebar {
    background-color: var(--primary-color);
    min-height: calc(100vh - 56px); /* 56px navbar */
    color: #fff;
    padding-top: 20px;
}

.sidebar .nav-link {
    color: rgba(255, 255, 255, 0.8);
    font-weight: 500;
    padding: 10px 20px;
    margin: 4px 15px;
    border-radius: 6px;
    transition: all 0.3s ease;
}

.sidebar .nav-link:hover, .sidebar .nav-link.active {
    background-color: var(--accent-color);
    color: #fff;
}

.sidebar .nav-link i {
    margin-right: 10px;
}

/* Content Area */
.main-content {
    padding: 30px;
}

/* Card Styling */
.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.02);
    margin-bottom: 24px;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.05);
}

.card-header {
    background-color: transparent;
    border-bottom: 1px solid var(--border-color);
    padding: 15px 20px;
    font-weight: 600;
    color: var(--primary-color);
}

.card-body {
    padding: 20px;
}

/* Buttons */
.btn-primary {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
    transition: all 0.3s ease;
}

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

/* Utilities */
.text-primary {
    color: var(--accent-color) !important;
}

.text-muted {
    color: var(--text-muted) !important;
}