/* =========================================
   1. Variables & Global Settings
   ========================================= */
:root {
    --primary-color: #0A2463;
    --secondary-color: #1d3b8e;
    --accent-color: #3E92CC;
    --success-color: #198754;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --text-dark: #2c3e50;
    --text-muted: #6c757d;
    --bg-light: #f4f6f9; /* Slightly cooler gray for modern look */
    --bg-white: #ffffff;
    --border-color: #e9ecef;
    
    /* Modern Shadows */
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.02);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.05);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.08);
    --shadow-hover: 0 10px 30px rgba(10, 36, 99, 0.1);

    /* Radii */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-pill: 50px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-light);
    color: var(--text-dark);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    font-size: 0.95rem;
}

a {
    text-decoration: none;
    transition: all 0.2s ease-in-out;
}

/* =========================================
   2. Typography & Headings
   ========================================= */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    color: var(--text-dark);
    letter-spacing: -0.02em;
    margin-bottom: 0.5rem;
}

.text-primary { color: var(--primary-color) !important; }
.bg-primary { background-color: var(--primary-color) !important; }

/* =========================================
   3. Buttons & Forms
   ========================================= */
.btn {
    font-weight: 600;
    padding: 0.6rem 1.25rem;
    border-radius: var(--radius-sm);
    transition: all 0.2s ease-in-out;
    border: 1px solid transparent;
    font-size: 0.9rem;
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    box-shadow: 0 4px 6px rgba(10, 36, 99, 0.15);
}

.btn-primary:hover, .btn-primary:focus {
    background-color: var(--secondary-color);
    border-color: var(--secondary-color);
    transform: translateY(-1px);
    box-shadow: 0 6px 12px rgba(10, 36, 99, 0.2);
}

.btn-outline-primary {
    color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-outline-primary:hover {
    background-color: var(--primary-color);
    color: #fff;
}

.btn-sm {
    padding: 0.4rem 0.8rem;
    font-size: 0.85rem;
}

.form-control, .form-select {
    padding: 0.75rem 1rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    background-color: #fff;
    transition: all 0.2s;
    font-size: 0.95rem;
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.25rem rgba(10, 36, 99, 0.1);
}

.input-group-text {
    background-color: #fff;
    border: 1px solid var(--border-color);
    color: var(--text-muted);
}

/* =========================================
   4. Cards & Containers
   ========================================= */
.card {
    border: none;
    border-radius: var(--radius-md);
    background-color: var(--bg-white);
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    margin-bottom: 1.5rem;
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.card-header {
    background-color: transparent;
    border-bottom: 1px solid var(--border-color);
    padding: 1.25rem 1.5rem;
    font-weight: 600;
}

.card-body {
    padding: 1.5rem;
}

.card-footer {
    background-color: transparent;
    border-top: 1px solid var(--border-color);
    padding: 1.25rem 1.5rem;
}

.shadow-sm { box-shadow: var(--shadow-sm) !important; }
.shadow-md { box-shadow: var(--shadow-md) !important; }
.shadow-lg { box-shadow: var(--shadow-lg) !important; }

/* =========================================
   5. Navigation (Navbar & Sidebar)
   ========================================= */
.navbar-custom {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
}

.navbar-brand {
    font-weight: 800;
    font-size: 1.5rem;
    color: var(--primary-color) !important;
}

.nav-link {
    font-weight: 500;
    color: var(--text-dark) !important;
    padding: 0.5rem 1rem;
}

.nav-link.active, .nav-link:hover {
    color: var(--primary-color) !important;
}

/* Sidebar Styles */
.sidebar {
    background-color: var(--bg-white);
    z-index: 100;
    box-shadow: 2px 0 10px rgba(0,0,0,0.02);
}

.sidebar-link {
    display: flex;
    align-items: center;
    padding: 0.85rem 1.5rem;
    color: var(--text-muted);
    font-weight: 500;
    border-left: 4px solid transparent;
    transition: all 0.2s;
    margin-bottom: 0.25rem;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.sidebar-link:hover {
    background-color: #f0f4ff;
    color: var(--primary-color);
    border-left-color: var(--primary-color);
}

.sidebar-link.active {
    background-color: #eef2ff;
    color: var(--primary-color);
    border-left-color: var(--primary-color);
    font-weight: 600;
}

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

/* =========================================
   6. Modals
   ========================================= */
.modal-content {
    border: none;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.modal-header {
    border-bottom: 1px solid var(--border-color);
    padding: 1.25rem 1.5rem;
    background-color: #f8f9fa;
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    border-top: 1px solid var(--border-color);
    padding: 1.25rem 1.5rem;
    background-color: #f8f9fa;
}

/* =========================================
   7. Tables
   ========================================= */
.table {
    --bs-table-hover-bg: #f8f9fa;
    margin-bottom: 0;
}

.table th {
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    border-bottom-width: 1px;
    padding: 1rem 1.5rem;
    background-color: #f8f9fa;
}

.table td {
    padding: 1rem 1.5rem;
    vertical-align: middle;
    color: var(--text-dark);
    border-bottom: 1px solid var(--border-color);
}

.table-hover tbody tr:hover {
    background-color: #f1f3f5;
}

/* =========================================
   8. Utilities & Helpers
   ========================================= */
.rounded-pill {
    border-radius: var(--radius-pill) !important;
}

.bg-light {
    background-color: var(--bg-light) !important;
}

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

/* Badges */
.badge {
    padding: 0.5em 0.8em;
    font-weight: 500;
    border-radius: 6px;
    font-size: 0.75rem;
}

/* Alerts */
.alert {
    border: none;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-sm);
}

/* Hover Effects */
.hover-shadow:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.transition-all {
    transition: all 0.3s ease;
}

/* =========================================
   9. Responsive Adjustments
   ========================================= */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        top: 0;
        left: -100%;
        height: 100vh;
        width: 250px;
        transition: left 0.3s ease;
        box-shadow: 5px 0 15px rgba(0,0,0,0.1);
    }
    
    .sidebar.show {
        left: 0;
    }

    .display-3 {
        font-size: 2.5rem;
    }
    
    .card {
        margin-bottom: 1rem;
    }
    
    .table-responsive {
        border-radius: var(--radius-sm);
    }
}

/* Padding Utilities */
.py-7 { padding-top: 4rem; padding-bottom: 4rem; }
.ls-1 { letter-spacing: 1px; }

/* Custom Scrollbar for Sidebar */
.sidebar::-webkit-scrollbar {
    width: 5px;
}
.sidebar::-webkit-scrollbar-track {
    background: #f1f1f1; 
}
.sidebar::-webkit-scrollbar-thumb {
    background: #ccc; 
    border-radius: 5px;
}
.sidebar::-webkit-scrollbar-thumb:hover {
    background: #aaa; 
}