:root {
    /* Minimal Enterprise Palette */
    --bs-primary: #2563eb;
    --bs-primary-rgb: 37, 99, 235;
    --bs-body-bg: #f8fafc;
    --bs-body-color: #475569; /* Slate 600 */
    --card-bg: #ffffff;
    --card-border: #e2e8f0; /* Slate 200 */
    --navbar-bg: #ffffff;
    --navbar-color: #475569;
    --table-hover-bg: #f1f5f9; /* Slate 100 */
    --input-bg: #ffffff;
    --input-border: #cbd5e1; /* Slate 300 */
    --heading-color: #1e293b; /* Slate 800 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
}

[data-bs-theme="dark"] {
    --bs-primary: #3b82f6;
    --bs-primary-rgb: 59, 130, 246;
    --bs-body-bg: #0f172a; /* Slate 900 */
    --bs-body-color: #94a3b8; /* Slate 400 */
    --card-bg: #1e293b; /* Slate 800 */
    --card-border: #334155; /* Slate 700 */
    --navbar-bg: #1e293b;
    --navbar-color: #94a3b8;
    --table-hover-bg: #334155;
    --input-bg: #0f172a;
    --input-border: #334155;
    --heading-color: #f1f5f9; /* Slate 100 */
    --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, 0.3);
}

* {
    box-sizing: border-box;
}

body {
    background-color: var(--bs-body-bg);
    color: var(--bs-body-color);
    font-family: 'Inter', system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 0.9rem;
    line-height: 1.5;
    transition: background-color 0.3s ease, color 0.3s ease;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    color: var(--heading-color);
    font-weight: 700;
    letter-spacing: -0.02em;
}

a {
    text-decoration: none;
    transition: color 0.15s ease;
}

/* ============================
   Two-Tier Header
   ============================ */
.app-header {
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--card-border);
    box-shadow: var(--shadow-sm);
    padding: 12px 24px;
    z-index: 1020;
}

.app-brand {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
}

.app-logo {
    max-height: 48px;
    width: auto;
    padding: 0;
    margin-bottom: 2px;
}

.app-name {
    font-size: 1rem;
    font-weight: 700;
    color: var(--heading-color);
    line-height: 1;
}

.app-navbar {
    background-color: var(--card-bg) !important;
    border-bottom: 1px solid var(--card-border);
    box-shadow: var(--shadow-sm);
    z-index: 1010;
}

.app-navbar .navbar-brand { display: none; }

.app-navbar .nav-link { 
    color: var(--bs-body-color) !important; 
    font-weight: 500; 
    padding: 12px 16px !important;
    border-bottom: 2px solid transparent;
    transition: all 0.2s ease;
}
.app-navbar .nav-link:hover, 
.app-navbar .nav-link.active { 
    color: var(--bs-primary) !important; 
    border-bottom-color: var(--bs-primary);
    background-color: transparent !important;
}

.app-navbar .dropdown-menu {
    border: 1px solid var(--card-border);
    box-shadow: var(--shadow-md);
    border-radius: 0.5rem;
}
.app-navbar .dropdown-item {
    padding: 8px 16px;
    font-weight: 500;
    color: var(--bs-body-color);
}
.app-navbar .dropdown-item:hover, 
.app-navbar .dropdown-item:focus {
    background-color: var(--table-hover-bg);
    color: var(--bs-primary);
}

/* ============================
   Layout & Cards
   ============================ */
.main-content { 
    padding: 2rem; 
    max-width: 1600px; 
    margin: 0 auto; 
}

.card {
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 0.75rem;
    box-shadow: var(--shadow-sm);
    margin-bottom: 1.5rem;
}

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

/* ============================
   Buttons
   ============================ */
.btn { 
    font-weight: 500; 
    border-radius: 0.375rem; 
    padding: 0.5rem 1rem; 
    transition: all 0.15s ease;
}
.btn-sm { padding: 0.35rem 0.75rem; font-size: 0.8rem; }
.btn-primary { background-color: var(--bs-primary); border-color: var(--bs-primary); }
.btn-primary:hover { background-color: rgba(var(--bs-primary-rgb), 0.9); border-color: rgba(var(--bs-primary-rgb), 0.9); }
.btn-outline-secondary { color: var(--bs-body-color); border-color: var(--input-border); }
.btn-outline-secondary:hover { background-color: var(--table-hover-bg); color: var(--heading-color); }

/* ============================
   Forms
   ============================ */
.form-control, .form-select {
    background-color: var(--input-bg);
    border: 1px solid var(--input-border);
    color: var(--heading-color);
    border-radius: 0.375rem;
    padding: 0.5rem 0.75rem;
    font-size: 0.9rem;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.form-control:focus, .form-select:focus {
    background-color: var(--input-bg);
    border-color: var(--bs-primary);
    color: var(--heading-color);
    box-shadow: 0 0 0 3px rgba(var(--bs-primary-rgb), 0.1);
}

/* ============================
   Tables (Minimal Enterprise Style)
   ============================ */
.table {
    color: var(--bs-body-color);
    border-collapse: separate;
    border-spacing: 0;
}
.table thead th {
    background-color: transparent;
    border-bottom: 1px solid var(--card-border);
    color: var(--heading-color);
    font-weight: 600;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 12px 16px;
}
.table tbody td {
    border-bottom: 1px solid var(--card-border);
    padding: 12px 16px;
    vertical-align: middle;
}
.table-hover tbody tr:hover {
    background-color: var(--table-hover-bg);
}

/* Minimal Badges */
.badge { 
    padding: 0.4em 0.8em; 
    font-weight: 600; 
    border-radius: 0.25rem; 
    font-size: 0.7rem; 
    text-transform: uppercase; 
    letter-spacing: 0.02em;
}
.bg-primary { background-color: rgba(var(--bs-primary-rgb), 0.1) !important; color: var(--bs-primary) !important; }
.bg-secondary { background-color: #e2e8f0 !important; color: #475569 !important; }
.bg-info { background-color: #e0f2fe !important; color: #0369a1 !important; }
.bg-warning { background-color: #fef3c7 !important; color: #92400e !important; }
.bg-danger { background-color: #fee2e2 !important; color: #b91c1c !important; }
.bg-success { background-color: #dcfce7 !important; color: #166534 !important; }

/* Dark mode badge fixes */
[data-bs-theme="dark"] .bg-secondary { background-color: #334155 !important; color: #94a3b8 !important; }
[data-bs-theme="dark"] .bg-info { background-color: rgba(14, 165, 233, 0.15) !important; color: #38bdf8 !important; }
[data-bs-theme="dark"] .bg-warning { background-color: rgba(245, 158, 11, 0.15) !important; color: #fbbf24 !important; }
[data-bs-theme="dark"] .bg-danger { background-color: rgba(239, 68, 68, 0.15) !important; color: #f87171 !important; }
[data-bs-theme="dark"] .bg-success { background-color: rgba(34, 197, 94, 0.15) !important; color: #4ade80 !important; }

/* ============================
   DataTables Polish
   ============================ */
.dataTables_wrapper .dataTables_length, 
.dataTables_wrapper .dataTables_filter { 
    margin-bottom: 15px; 
    color: var(--bs-body-color); 
}
.dataTables_wrapper .dataTables_filter input { 
    margin-left: 10px; 
}
.dt-buttons .btn { 
    margin-right: 5px; 
    margin-bottom: 10px; 
    border-radius: 0.375rem; 
    font-size: 0.8rem; 
    font-weight: 500; 
}
.dt-buttons .buttons-copy { background-color: #475569 !important; border-color: #475569 !important; color: #fff !important; }
.dt-buttons .buttons-csv { background-color: #2563eb !important; border-color: #2563eb !important; color: #fff !important; }
.dt-buttons .buttons-excel { background-color: #16a34a !important; border-color: #16a34a !important; color: #fff !important; }
.dt-buttons .buttons-print { background-color: #334155 !important; border-color: #334155 !important; color: #fff !important; }

/* ============================
   Modals
   ============================ */
.modal-content {
    border: 1px solid var(--card-border);
    border-radius: 0.75rem;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}
.modal-header {
    border-bottom: 1px solid var(--card-border);
    padding: 1.25rem 1.5rem;
}
.modal-body { padding: 1.5rem; }
.modal-footer {
    border-top: 1px solid var(--card-border);
    padding: 1rem 1.5rem;
}