/* ============================================
   MODERN DESIGN SYSTEM
   ============================================ */

:root {
    /* Primary Palette */
    --primary-color: #2563EB;
    /* Royal Blue */
    --primary-hover: #1D4ED8;
    --secondary-color: #64748B;
    /* Slate */

    /* Backgrounds */
    --bg-body: #F3F4F6;
    /* Cool Gray 100 */
    --bg-card: #FFFFFF;
    --bg-glass: rgba(255, 255, 255, 0.95);

    /* Text */
    --text-main: #111827;
    /* Gray 900 */
    --text-muted: #6B7280;
    /* Gray 500 */

    /* Borders & Shadows */
    --border-color: #E5E7EB;
    /* Gray 200 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);

    /* Accents */
    --accent-success: #10B981;
    --accent-warning: #F59E0B;
    --accent-danger: #EF4444;
}

/* Base Styles */
body {
    background-color: var(--bg-body) !important;
    color: var(--text-main);
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    color: var(--text-main);
    font-weight: 600;
    letter-spacing: -0.025em;
}

/* Navbar Improvements */
.navbar {
    background-color: #1F2937 !important;
    /* Gray 800 */
    box-shadow: var(--shadow-md);
    padding: 0.75rem 1rem;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.25rem;
    color: #FFFFFF !important;
}

.navbar .nav-link {
    color: #D1D5DB !important;
    /* Gray 300 */
    font-weight: 500;
    transition: color 0.2s;
}

.navbar .nav-link:hover,
.navbar .nav-link.active {
    color: #FFFFFF !important;
}

/* Page Tabs Styles */
.nav-tabs.custom-tabs {
    border-bottom: 2px solid #E5E7EB;
    margin-bottom: 1rem;
    background: transparent;
}

.nav-tabs.custom-tabs .nav-link {
    color: #4B5563 !important;
    /* Dark Gray for inactive */
    font-weight: 600;
    border: none;
    border-bottom: 2px solid transparent;
    transition: all 0.2s;
    background: transparent !important;
    margin-bottom: -2px;
    padding: 0.75rem 1.25rem;
    opacity: 1;
    /* Ensure full opacity */
}

.nav-tabs.custom-tabs .nav-link:hover {
    color: var(--primary-color) !important;
    background-color: rgba(37, 99, 235, 0.05) !important;
}

.nav-tabs.custom-tabs .nav-link.active {
    color: var(--primary-color) !important;
    /* Royal Blue for active */
    border-bottom: 2px solid var(--primary-color) !important;
    background: transparent !important;
    font-weight: 700;
}

.nav-tabs.custom-tabs .nav-link .bi {
    margin-right: 0.5rem;
}

/* Card Styles */
.card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color) !important;
    border-radius: 0.75rem !important;
    box-shadow: var(--shadow-sm) !important;
    transition: transform 0.2s, box-shadow 0.2s;
}

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

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

/* Glassmorphism Utility */
.glass-panel {
    background: var(--bg-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

/* Table Styles */
.table {
    margin-bottom: 0;
    color: var(--text-main);
}

.table th {
    background-color: #F9FAFB !important;
    /* Gray 50 */
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    border-bottom: 1px solid var(--border-color) !important;
    padding: 0.75rem 1rem !important;
}

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

.table-hover tbody tr:hover {
    background-color: #F9FAFB !important;
}

/* Badges */
.badge {
    padding: 0.35em 0.65em;
    font-weight: 600;
    border-radius: 0.375rem;
}

.badge.bg-info {
    background-color: #E0F2FE !important;
    color: #0369A1;
}

.badge.bg-success {
    background-color: #DCFCE7 !important;
    color: #15803D;
}

.badge.bg-secondary {
    background-color: #F3F4F6 !important;
    color: #4B5563;
}

/* Buttons */
.btn {
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    transition: all 0.2s;
}

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

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

/* Form Controls */
.form-control {
    border-radius: 0.5rem;
    border-color: var(--border-color);
    padding: 0.625rem 0.875rem;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* List Group */
.list-group-item {
    border-color: var(--border-color);
    padding: 0.75rem 1rem;
    color: var(--text-main);
    transition: background-color 0.2s;
}

.list-group-item:hover {
    background-color: #F9FAFB;
}

.list-group-item.active {
    background-color: #EFF6FF !important;
    /* Blue 50 */
    border-color: #EFF6FF !important;
    color: var(--primary-color) !important;
    font-weight: 600;
}

.list-group-item.active .badge {
    background-color: var(--primary-color) !important;
    color: white;
}

/* Utilities */
.text-muted-sm {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.fw-semibold {
    font-weight: 600 !important;
}