:root {
    /* Modern Color Palette (Inter-based UI) */
    --primary-50: #eef2ff;
    --primary-100: #e0e7ff;
    --primary-500: #6366f1;
    --primary-600: #4f46e5;
    --primary-700: #4338ca;

    --slate-50: #f8fafc;
    --slate-100: #f1f5f9;
    --slate-200: #e2e8f0;
    --slate-300: #cbd5e1;
    --slate-400: #94a3b8;
    --slate-500: #64748b;
    --slate-600: #475569;
    --slate-700: #334155;
    --slate-800: #1e293b;
    --slate-900: #0f172a;

    --success-surface: #ecfdf5;
    --success-text: #059669;
    --danger-surface: #fef2f2;
    --danger-text: #dc2626;

    /* Semantic Variables */
    --bg-body: var(--slate-50);
    --bg-surface: #ffffff;
    --bg-sidebar: var(--slate-900);

    --text-primary: var(--slate-900);
    --text-secondary: var(--slate-500);
    --text-on-dark: #ffffff;

    --border-light: var(--slate-200);

    --primary-color: var(--primary-600);
    --primary-hover: var(--primary-700);

    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-glow: 0 0 15px rgba(99, 102, 241, 0.3);

    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-body);
    color: var(--text-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    /* Subtle grid pattern for modern tech feel */
    background-image: radial-gradient(var(--slate-200) 1px, transparent 1px);
    background-size: 32px 32px;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 700;
    letter-spacing: -0.025em;
    color: var(--slate-900);
}

/* --- Sidebar --- */
#wrapper {
    display: flex;
    width: 100%;
    overflow: hidden;
}

#sidebar-wrapper {
    min-width: 17rem;
    max-width: 17rem;
    min-height: 100vh;
    background: var(--bg-sidebar);
    /* Subtle gradient overlay */
    background-image: linear-gradient(to bottom, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0));
    color: var(--text-on-dark);
    transition: margin-left 0.3s ease-in-out;
    z-index: 1000;
    display: flex;
    flex-direction: column;
}

#sidebar-wrapper .sidebar-brand {
    padding: 2rem 1.5rem;
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    color: white;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: rgba(0, 0, 0, 0.2);
}

#sidebar-wrapper .sidebar-brand i {
    color: var(--primary-500);
}

#sidebar-wrapper .list-group {
    padding: 1rem;
    gap: 0.5rem;
}

#sidebar-wrapper .list-group-item {
    background: transparent;
    border: none;
    color: var(--slate-400);
    padding: 0.875rem 1rem;
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    transition: all 0.2s ease;
}

#sidebar-wrapper .list-group-item i {
    margin-right: 0.75rem;
    font-size: 1.1rem;
    transition: transform 0.2s;
}

#sidebar-wrapper .list-group-item:hover {
    background-color: rgba(255, 255, 255, 0.08);
    color: white;
    transform: translateX(4px);
}

#sidebar-wrapper .list-group-item:hover i {
    transform: scale(1.1);
    color: var(--primary-500);
}

#sidebar-wrapper .list-group-item.active {
    background: linear-gradient(90deg, var(--primary-600), var(--primary-700));
    color: white;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

#sidebar-wrapper .list-group-item.text-danger:hover {
    background-color: rgba(220, 38, 38, 0.1);
    color: #f87171;
}

/* --- Main Content --- */
#page-content-wrapper {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
}

/* --- Navbar --- */
.navbar {
    background: rgba(255, 255, 255, 0.8) !important;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-light);
    padding: 1rem 2rem;
    position: sticky;
    top: 0;
    z-index: 900;
}

.navbar .nav-link {
    font-weight: 600;
    color: var(--slate-700) !important;
    font-size: 0.95rem;
}

/* --- Cards --- */
.card {
    background: var(--bg-surface);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    overflow: hidden;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-100);
}

/* Disable card hover effect inside modals to prevent flickering */
.modal .card:hover {
    transform: none !important;
    box-shadow: var(--shadow-sm) !important;
    border-color: var(--border-light) !important;
}

.card-header {
    background: white;
    border-bottom: 1px solid var(--slate-100);
    padding: 1.5rem;
    font-weight: 700;
    color: var(--slate-800);
    font-size: 1.1rem;
}

.card-body {
    padding: 1.5rem;
}

/* --- Forms --- */
.form-label {
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--slate-700);
    margin-bottom: 0.5rem;
}

.form-control {
    background-color: var(--slate-50);
    border: 1px solid var(--slate-200);
    border-radius: var(--radius-lg);
    padding: 0.75rem 1rem;
    font-size: 0.95rem;
    transition: all 0.2s;
}

.form-control:focus {
    background-color: white;
    border-color: var(--primary-500);
    box-shadow: 0 0 0 4px var(--primary-100);
}

/* --- Buttons --- */
.btn {
    padding: 0.6rem 1.2rem;
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: 0.95rem;
    letter-spacing: 0.01em;
    transition: all 0.2s;
    border: none;
}

.btn-primary {
    background: var(--primary-600);
    box-shadow: 0 2px 5px rgba(79, 70, 229, 0.3);
}

.btn-primary:hover {
    background: var(--primary-700);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.4);
}

.btn-success {
    background: #10b981;
    box-shadow: 0 2px 5px rgba(16, 185, 129, 0.3);
}

.btn-secondary {
    background: white;
    color: var(--slate-700);
    border: 1px solid var(--slate-200);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    background: var(--slate-50);
    border-color: var(--slate-300);
    color: var(--slate-900);
}

.btn-sm {
    padding: 0.4rem 0.8rem;
    font-size: 0.85rem;
    border-radius: var(--radius-md);
}

/* --- Tables --- */
.table-responsive {
    border-radius: var(--radius-lg);
}

.table {
    margin-bottom: 0;
    border-collapse: separate;
    border-spacing: 0;
}

.table thead th {
    background-color: var(--slate-50);
    color: var(--slate-500);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--slate-200);
}

.table tbody td {
    padding: 1.25rem 1.5rem;
    vertical-align: middle;
    color: var(--slate-700);
    border-bottom: 1px solid var(--slate-100);
    font-size: 0.95rem;
    background: white;
    transition: background 0.2s;
}

.table-hover tbody tr:hover td {
    background-color: var(--primary-50);
}

.table tbody tr:last-child td {
    border-bottom: none;
}

/* --- Badges --- */
.badge {
    padding: 0.5em 0.8em;
    font-weight: 600;
    font-size: 0.75rem;
    letter-spacing: 0.02em;
    border-radius: 2rem;
}

.bg-success {
    background-color: var(--success-surface) !important;
    color: var(--success-text);
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.bg-secondary {
    background-color: var(--slate-100) !important;
    color: var(--slate-500);
    border: 1px solid var(--slate-200);
}

/* --- Pagination --- */
.pagination {
    gap: 0.25rem;
}

.page-link {
    border: none;
    border-radius: var(--radius-md);
    color: var(--slate-600);
    font-weight: 500;
    padding: 0.5rem 0.75rem;
    min-width: 2.5rem;
    text-align: center;
}

.page-link:hover {
    background-color: var(--slate-100);
    color: var(--primary-600);
}

.page-item.active .page-link {
    background-color: var(--primary-600);
    color: white;
    box-shadow: var(--shadow-md);
}

.page-item.disabled .page-link {
    background-color: transparent;
    color: var(--slate-300);
}

/* --- Login Page --- */
.login-page {
    background: linear-gradient(135deg, #4f46e5 0%, #06b6d4 100%);
    position: relative;
    overflow: hidden;
}

.login-page::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background-image: radial-gradient(rgba(255, 255, 255, 0.1) 1px, transparent 1px);
    background-size: 40px 40px;
}

.login-card {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.5);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    padding: 3rem;
    width: 100%;
    max-width: 420px;
    border-radius: 1.5rem;
    position: relative;
    z-index: 10;
}

/* Responsive */
@media (max-width: 768px) {
    #sidebar-wrapper {
        margin-left: -17rem;
    }

    body.sb-sidenav-toggled #sidebar-wrapper {
        margin-left: 0;
    }
}

@media (min-width: 769px) {
    body.sb-sidenav-toggled #sidebar-wrapper {
        margin-left: 0;
        min-width: 5rem;
        max-width: 5rem;
    }

    body.sb-sidenav-toggled #sidebar-wrapper .sidebar-brand span:not(.bi),
    body.sb-sidenav-toggled #sidebar-wrapper .link-text,
    body.sb-sidenav-toggled #sidebar-wrapper .bi-chevron-down {
        display: none !important;
    }

    body.sb-sidenav-toggled #sidebar-wrapper .sidebar-brand {
        justify-content: center;
        padding-left: 0;
        padding-right: 0;
    }

    body.sb-sidenav-toggled #sidebar-wrapper .list-group-item {
        justify-content: center;
        padding-left: 0;
        padding-right: 0;
    }

    body.sb-sidenav-toggled #sidebar-wrapper .list-group-item i {
        margin-right: 0;
    }

    body.sb-sidenav-toggled #sidebar-wrapper .collapse .list-group-item {
        padding-left: 0 !important;
    }
}

/* --- Cropper Modal --- */
#cropperModal .img-container {
    width: 100%;
    min-height: 400px;
    max-height: 60vh;
    background-color: var(--slate-100);
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
}

#cropperModal .modal-body {
    padding: 1.25rem;
}

#cropperModal .btn-group .btn {
    padding: 0.4rem 0.7rem;
}