:root {
    --primary: #4f46e5;
    --primary-dark: #4338ca;
    --primary-light: #e0e7ff;
    --secondary: #10b981;
    --dark: #1e293b;
    --light: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --white: #ffffff;
    --sidebar-width: 280px;
    --header-height: 70px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: #f3f4f6;
    color: var(--dark);
    line-height: 1.5;
    overflow-x: hidden;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--dark);
    position: fixed;
    left: 0;
    top: 0;
    z-index: 1000;
    transition: var(--transition);
    color: var(--white);
    padding: 1.5rem;
}

.sidebar.collapsed {
    left: calc(var(--sidebar-width) * -1);
}

.sidebar-brand {
    font-size: 1.5rem;
    font-weight: 800;
    margin-bottom: 2rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--white);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem 1rem;
    color: var(--gray-400);
    text-decoration: none;
    border-radius: 0.5rem;
    margin-bottom: 0.5rem;
    transition: var(--transition);
}

.nav-link:hover, .nav-link.active {
    background: rgba(255, 255, 255, 0.1);
    color: var(--white);
}

.nav-link i {
    font-size: 1.25rem;
}

/* Main Content */
.main-wrapper {
    margin-left: var(--sidebar-width);
    transition: var(--transition);
    min-height: 100vh;
}

.main-wrapper.full {
    margin-left: 0;
}

.header {
    height: var(--header-height);
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2rem;
    position: sticky;
    top: 0;
    z-index: 900;
}

.content {
    padding: 2rem;
}

/* Cards */
.card {
    background: var(--white);
    border-radius: 1rem;
    border: 1px solid rgba(0,0,0,0.03);
    box-shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.05), 0 0 3px rgba(0,0,0,0.02);
    transition: var(--transition);
    margin-bottom: 1.5rem;
    animation: fadeIn 0.5s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 15px 30px -5px rgba(0, 0, 0, 0.08);
}

.card-header {
    background: transparent;
    border-bottom: 1px solid var(--gray-100);
    padding: 1.25rem;
    font-weight: 700;
    color: var(--gray-600);
}

.card-body {
    padding: 1.25rem;
}

/* KPI Cards */
.kpi-card {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.kpi-icon {
    width: 3.5rem;
    height: 3.5rem;
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.kpi-data h3 {
    font-size: 0.875rem;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 0.025em;
    margin-bottom: 0.25rem;
}

.kpi-data p {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--dark);
}

/* Form Styling */
.form-control, .form-select {
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    border: 1px solid var(--gray-300);
    transition: var(--transition);
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px var(--primary-light);
}

.btn {
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    font-weight: 600;
    transition: var(--transition);
    letter-spacing: 0.025em;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    border: none;
    color: var(--white);
    box-shadow: 0 4px 10px rgba(79, 70, 229, 0.2);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-dark) 0%, #312e81 100%);
    box-shadow: 0 6px 15px rgba(79, 70, 229, 0.3);
    transform: translateY(-1px);
}

/* Mobile Responsive */
@media (max-width: 991.98px) {
    .sidebar {
        left: calc(var(--sidebar-width) * -1);
    }
    
    .sidebar.show {
        left: 0;
    }
    
    .main-wrapper {
        margin-left: 0;
    }
}

/* Tables */
.table {
    border-collapse: separate;
    border-spacing: 0 0.5rem;
    width: 100%;
}

.table tr {
    background: var(--white);
    transition: var(--transition);
}

.table tbody tr:hover {
    transform: scale(1.005);
    box-shadow: 0 4px 10px rgba(0,0,0,0.03);
    z-index: 1;
    position: relative;
}

.table td, .table th {
    padding: 1.2rem 1rem;
    vertical-align: middle;
    border-top: 1px solid transparent;
    border-bottom: 1px solid transparent;
}

.table tbody tr td:first-child {
    border-left: 1px solid var(--gray-100);
    border-top-left-radius: 0.5rem;
    border-bottom-left-radius: 0.5rem;
}

.table tbody tr td:last-child {
    border-right: 1px solid var(--gray-100);
    border-top-right-radius: 0.5rem;
    border-bottom-right-radius: 0.5rem;
}

.table tbody tr td {
    border-top: 1px solid var(--gray-100);
    border-bottom: 1px solid var(--gray-100);
}

.table thead th {
    background: transparent;
    border-bottom: none;
    color: var(--gray-400);
    font-size: 0.75rem;
    text-transform: uppercase;
    font-weight: 800;
    letter-spacing: 0.05em;
    padding-bottom: 0.25rem;
}

.badge {
    padding: 0.5rem 1rem;
    border-radius: 2rem;
    font-weight: 600;
}

.bg-light-primary { background: #eef2ff; color: #4f46e5; }
.bg-light-success { background: #ecfdf5; color: #10b981; }
.bg-light-danger { background: #fef2f2; color: #ef4444; }
.bg-light-warning { background: #fffbeb; color: #f59e0b; }

/* Dark Mode support */
body.dark-mode {
    background-color: #0f172a;
    color: var(--gray-300);
}

.dark-mode .card, .dark-mode .header {
    background: #1e293b;
    border-color: #334155;
    color: var(--white);
}

.dark-mode .card-header {
    border-color: #334155;
    color: var(--gray-300);
}

.dark-mode h1, .dark-mode h2, .dark-mode h3, .dark-mode h4, .dark-mode h5, .dark-mode h6, 
.dark-mode .text-dark, .dark-mode .fw-bold {
    color: #f8fafc !important;
}

.dark-mode .text-muted, .dark-mode p {
    color: var(--gray-400) !important;
}

.dark-mode .table tr, 
.dark-mode .table tbody tr,
.dark-mode .table tbody tr td {
    background-color: #1e293b !important;
}

.dark-mode .table tbody tr:hover,
.dark-mode .table tbody tr:hover td {
    background-color: #334155 !important;
}

.dark-mode .table tbody tr td {
    border-color: #334155 !important;
    color: #e2e8f0 !important;
}

.dark-mode .table tbody tr td:first-child,
.dark-mode .table tbody tr td:last-child {
    border-color: #334155 !important;
}

.dark-mode .btn-light {
    background-color: #334155 !important;
    color: #f8fafc !important;
    border-color: #475569 !important;
}

.dark-mode .bg-light {
    background-color: #334155 !important;
}

.dark-mode .form-control, .dark-mode .form-select {
    background: #0f172a;
    border-color: #334155;
    color: var(--white);
}

/* Utilities custom */
.border-dashed {
    border: 2px dashed var(--gray-300);
}

.dark-mode .border-dashed {
    border-color: #334155;
}

/* Modals */
.dark-mode .modal-content {
    background-color: #1e293b;
    border: 1px solid #334155;
}
.modal-content {
    border-radius: 1.5rem;
}
.modal-header .btn-close {
    background-color: var(--gray-100);
    border-radius: 50%;
    padding: 0.5rem;
    transition: var(--transition);
}
.modal-header .btn-close:hover {
    background-color: var(--gray-200);
}
.dark-mode .modal-header .btn-close {
    background-color: #334155;
    filter: invert(1) grayscale(100%) brightness(200%);
}