:root {
    /* Base Variables */
    --font-family: 'Inter', 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    
    /* Colors - Light Mode Defaults */
    --bg-primary: #f8fafc;
    --bg-secondary: #f1f5f9;
    --surface: #ffffff;
    --surface-glass: rgba(255, 255, 255, 0.7);
    --border: rgba(0, 0, 0, 0.1);
    
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --text-muted: #64748b;
    
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --success: #10b981;
    --success-hover: #059669;
    --warning: #f59e0b;
    --warning-hover: #d97706;
    --danger: #ef4444;
    --danger-hover: #dc2626;
    --info: #0ea5e9;
    --info-hover: #0284c7;
    
    --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);
    --shadow-glass: 0 8px 32px 0 rgba(31, 38, 135, 0.07);
    
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --surface: #1e293b;
    --surface-glass: rgba(30, 41, 59, 0.7);
    --border: rgba(255, 255, 255, 0.1);
    
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    
    --primary: #3b82f6;
    --primary-hover: #60a5fa;
    --success: #10b981;
    --success-hover: #34d399;
    --warning: #f59e0b;
    --warning-hover: #fbbf24;
    --danger: #ef4444;
    --danger-hover: #f87171;
    --info: #0ea5e9;
    --info-hover: #38bdf8;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
    --shadow-glass: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
}

/* Base Styles */
body {
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    margin: 0;
    padding: 0;
    min-height: 100vh;
    transition: var(--transition);
    overflow-x: hidden;
    position: relative;
}

/* Background Gradients (Modern Look) */
body::before {
    content: '';
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at center, rgba(59, 130, 246, 0.1) 0%, transparent 40%),
                radial-gradient(circle at 80% 20%, rgba(16, 185, 129, 0.05) 0%, transparent 30%);
    z-index: -1;
    pointer-events: none;
}

[data-theme="dark"] body::before {
    background: radial-gradient(circle at center, rgba(59, 130, 246, 0.15) 0%, transparent 40%),
                radial-gradient(circle at 80% 20%, rgba(139, 92, 246, 0.1) 0%, transparent 30%);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    color: var(--text-primary);
    font-weight: 600;
    margin-top: 0;
}

p {
    color: var(--text-secondary);
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

/* Layout Utilities */
.app-container {
    display: flex;
    min-height: 100vh;
}

.main-content {
    flex-grow: 1;
    padding: 2rem;
    margin-left: 260px; /* Sidebar width */
    transition: var(--transition);
    width: calc(100% - 260px);
}

@media (max-width: 991.98px) {
    .main-content {
        margin-left: 0;
        width: 100%;
        padding: 1.5rem 1rem;
        padding-top: 5rem; /* Space for topnav */
    }
}

/* Glassmorphism Components */
.glass-card {
    background: var(--surface-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-glass);
    padding: 1.5rem;
    transition: var(--transition);
}

.glass-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.glass-panel {
    background: var(--surface-glass);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-glass);
    overflow: hidden;
}

.glass-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.glass-body {
    padding: 1.5rem;
}

/* Navigation - Sidebar */
.sidebar {
    width: 260px;
    background: var(--surface-glass);
    backdrop-filter: blur(16px);
    border-right: 1px solid var(--border);
    position: fixed;
    height: 100vh;
    top: 0;
    left: 0;
    z-index: 1030;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-md);
}

.sidebar-brand {
    height: 70px;
    display: flex;
    align-items: center;
    padding: 0 1.5rem;
    border-bottom: 1px solid var(--border);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
}

.sidebar-brand:hover {
    text-decoration: none;
}

.sidebar-brand i {
    color: var(--primary);
    margin-right: 0.75rem;
    font-size: 1.5rem;
}

.sidebar-nav {
    flex-grow: 1;
    overflow-y: auto;
    padding: 1.5rem 1rem;
    list-style: none;
    margin: 0;
}

.sidebar-nav-item {
    margin-bottom: 0.5rem;
}

.sidebar-nav-link {
    display: flex;
    align-items: center;
    padding: 0.75rem 1rem;
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    transition: var(--transition);
    font-weight: 500;
    text-decoration: none;
}

.sidebar-nav-link i {
    width: 1.5rem;
    font-size: 1.1rem;
    margin-right: 0.75rem;
    text-align: center;
}

.sidebar-nav-link:hover {
    background: rgba(59, 130, 246, 0.1);
    color: var(--primary);
    text-decoration: none;
}

.sidebar-nav-link.active {
    background: var(--primary);
    color: #ffffff;
    box-shadow: var(--shadow-md);
}

.sidebar-nav-link.active i {
    color: #ffffff;
}

/* Top Navigation (Mobile) */
.topnav {
    display: none;
    background: var(--surface-glass);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 70px;
    z-index: 1020;
    align-items: center;
    justify-content: space-between;
    padding: 0 1.5rem;
    box-shadow: var(--shadow-sm);
}

@media (max-width: 991.98px) {
    .sidebar {
        transform: translateX(-100%);
    }
    .sidebar.show {
        transform: translateX(0);
    }
    .topnav {
        display: flex;
    }
}

.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(2px);
    z-index: 1025;
}

.sidebar-overlay.show {
    display: block;
}

/* Buttons */
.btn-glass {
    background: var(--surface-glass);
    backdrop-filter: blur(4px);
    border: 1px solid var(--border);
    color: var(--text-primary);
    border-radius: var(--radius-md);
    padding: 0.5rem 1rem;
    font-weight: 500;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    cursor: pointer;
}

.btn-glass:hover {
    background: var(--bg-secondary);
    border-color: var(--text-muted);
}

.btn-primary {
    background: var(--primary);
    border: 1px solid var(--primary);
    color: #ffffff;
}

.btn-primary:hover {
    background: var(--primary-hover);
    border-color: var(--primary-hover);
    color: #ffffff;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.btn-success { background: var(--success); border-color: var(--success); color: white; }
.btn-success:hover { background: var(--success-hover); border-color: var(--success-hover); color: white; box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3); }

.btn-danger { background: var(--danger); border-color: var(--danger); color: white; }
.btn-danger:hover { background: var(--danger-hover); border-color: var(--danger-hover); color: white; box-shadow: 0 4px 12px rgba(239, 68, 68, 0.3); }

.btn-warning { background: var(--warning); border-color: var(--warning); color: white; }
.btn-warning:hover { background: var(--warning-hover); border-color: var(--warning-hover); color: white; box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3); }

/* Button Group Standardization (Option A) */
.btn-group .btn {
    border-color: var(--border) !important;
    background: transparent !important;
}

.btn-group .btn:hover,
.btn-group .btn:focus,
.btn-group .btn:active {
    background: rgba(0, 0, 0, 0.05) !important;
    color: var(--bs-btn-color) !important; /* Keep original icon color */
    box-shadow: none !important;
}

.no-bg-btn,
.no-bg-btn:hover,
.no-bg-btn:focus,
.no-bg-btn:active,
.no-bg-btn:focus-visible {
    background-color: transparent !important;
    border-color: transparent !important;
    box-shadow: none !important; /* Removes the Bootstrap focus ring/glow */
    outline: none !important;
}

[data-theme="dark"] .btn-group .btn:hover,
[data-theme="dark"] .btn-group .btn:focus,
[data-theme="dark"] .btn-group .btn:active {
    background: rgba(255, 255, 255, 0.05) !important;
}

/* Forms */
.form-label {
    color: var(--text-primary);
    font-weight: 500;
    margin-bottom: 0.5rem;
    display: block;
}

/* THE AUTOFILL OVERRIDE HACK */
input:-webkit-autofill,
input:-webkit-autofill:hover,
input:-webkit-autofill:focus,
input:-webkit-autofill:active {
    -webkit-box-shadow: 0 0 0 30px var(--bg-primary) inset !important;
    -webkit-text-fill-color: var(--text-primary) !important;
    transition: background-color 5000s ease-in-out 0s;
}

.input-group:has(input:-webkit-autofill) {
    background: var(--bg-primary) !important;
}

.input-group:has(input:-webkit-autofill) .input-group-text {
    background: transparent !important;
}

.form-control, .form-select {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    border-radius: var(--radius-md);
    padding: 0.6rem 1rem;
    transition: var(--transition);
    width: 100%;
}

.form-control:focus, .form-select:focus {
    background: var(--surface);
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
    outline: none;
    color: var(--text-primary);
}

.form-control::placeholder {
    color: var(--text-muted);
}

/* BULLETPROOF SEAMLESS INPUT GROUPS */
.input-group {
    border: 1px solid var(--border) !important;
    background: var(--bg-primary) !important;
    border-radius: var(--radius-md);
    transition: var(--transition);
    display: flex;
    overflow: hidden;
}

.input-group .form-control,
.input-group .form-select,
.input-group .input-group-text {
    border: none !important;
    background: transparent !important;
    box-shadow: none !important;
    border-radius: 0;
}

.input-group-text {
    padding: 0.6rem 1rem;
    display: flex;
    align-items: center;
    color: var(--text-secondary);
}

.input-group:focus-within {
    border-color: var(--primary) !important;
    background: var(--surface) !important;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.input-group:focus-within .input-group-text {
    color: var(--primary);
}

.input-group .form-control:focus,
.input-group .form-select:focus {
    box-shadow: none !important;
    transform: none !important;
    background-color: transparent !important;
}

/* Tables */
.table-responsive {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border-radius: var(--radius-md);
}

/* Base Bootstrap Table Overrides for Theme Consistency */
.table {
    --bs-table-bg: transparent;
    --bs-table-color: var(--text-primary);
    --bs-table-border-color: var(--border);
    --bs-table-striped-bg: rgba(0, 0, 0, 0.02);
    --bs-table-striped-color: var(--text-primary);
    --bs-table-active-bg: rgba(0, 0, 0, 0.05);
    --bs-table-active-color: var(--text-primary);
    --bs-table-hover-bg: rgba(0, 0, 0, 0.03);
    --bs-table-hover-color: var(--text-primary);
    color: var(--text-primary);
}

[data-theme="dark"] .table {
    --bs-table-striped-bg: rgba(255, 255, 255, 0.02);
    --bs-table-active-bg: rgba(255, 255, 255, 0.05);
    --bs-table-hover-bg: rgba(255, 255, 255, 0.03);
}

.table th, .table td {
    border-bottom: 1px solid var(--border);
    vertical-align: middle;
}

.table th {
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
}

.glass-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
}

.glass-table th {
    background: rgba(0, 0, 0, 0.02);
    color: var(--text-secondary);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    padding: 1rem;
    border-bottom: 1px solid var(--border);
    text-align: left;
}

[data-theme="dark"] .glass-table th {
    background: rgba(255, 255, 255, 0.02);
}

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

.glass-table tbody tr {
    transition: var(--transition);
}

.glass-table tbody tr:hover {
    background: rgba(0, 0, 0, 0.02);
}

[data-theme="dark"] .glass-table tbody tr:hover {
    background: rgba(255, 255, 255, 0.03);
}

/* Badges */
.badge {
    padding: 0.35em 0.65em;
    font-size: 0.75em;
    font-weight: 600;
    border-radius: var(--radius-xl);
    display: inline-block;
}

.badge-success { background: rgba(16, 185, 129, 0.1); color: var(--success); border: 1px solid rgba(16, 185, 129, 0.2); }
.badge-danger { background: rgba(239, 68, 68, 0.1); color: var(--danger); border: 1px solid rgba(239, 68, 68, 0.2); }
.badge-warning { background: rgba(245, 158, 11, 0.1); color: var(--warning); border: 1px solid rgba(245, 158, 11, 0.2); }
.badge-primary { background: rgba(59, 130, 246, 0.1); color: var(--primary); border: 1px solid rgba(59, 130, 246, 0.2); }

/* Theme Toggle */
.theme-toggle {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1.25rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover {
    background: var(--bg-secondary);
    color: var(--primary);
}

/* Utilities */
.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 1rem; }
.mb-4 { margin-bottom: 1.5rem; }
.mt-3 { margin-top: 1rem; }
.mt-4 { margin-top: 1.5rem; }
.me-2 { margin-right: 0.5rem; }
.ms-2 { margin-left: 0.5rem; }
.d-flex { display: flex; }
.align-items-center { align-items: center; }
.justify-content-between { justify-content: space-between; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 1rem; }
.text-center { text-align: center; }
.text-muted { color: var(--text-muted) !important; }
.text-success { color: var(--success) !important; }
.text-danger { color: var(--danger) !important; }
.text-primary { color: var(--primary) !important; }

/* Dashboard Specifics */
.stat-card {
    display: flex;
    align-items: center;
    padding: 1.5rem;
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-right: 1rem;
}

.stat-icon.primary { background: rgba(59, 130, 246, 0.1); color: var(--primary); }
.stat-icon.success { background: rgba(16, 185, 129, 0.1); color: var(--success); }
.stat-icon.warning { background: rgba(245, 158, 11, 0.1); color: var(--warning); }
.stat-icon.danger { background: rgba(239, 68, 68, 0.1); color: var(--danger); }

.stat-details h3 {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 700;
}

.stat-details p {
    margin: 0;
    font-size: 0.875rem;
    color: var(--text-muted);
}