/* Necner Technology Multi-Tenant SaaS Platform
 * Core Design System & Styling
 */

:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #eff6ff;
    --surface: #ffffff;
    --background: #f8fafc;
    --border: #e2e8f0;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --sidebar-width: 260px;
    --header-height: 64px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--background);
    color: var(--text-main);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

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

.sidebar {
    width: var(--sidebar-width);
    background-color: var(--surface);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    z-index: 40;
    transition: transform 0.2s ease-in-out;
}

.sidebar-header {
    height: var(--header-height);
    display: flex;
    align-items: center;
    padding: 0 1.5rem;
    border-bottom: 1px solid var(--border);
    gap: 0.75rem;
}

.brand-badge {
    font-weight: 700;
    font-size: 1.125rem;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sidebar-nav {
    flex: 1;
    padding: 1.25rem 0.75rem;
    overflow-y: auto;
}

.nav-section-title {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--text-muted);
    letter-spacing: 0.05em;
    padding: 0.5rem 0.75rem;
    margin-top: 0.5rem;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.625rem 0.75rem;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: 0.375rem;
    transition: all 0.15s ease;
    margin-bottom: 0.25rem;
}

.nav-link:hover {
    background-color: var(--background);
    color: var(--text-main);
}

.nav-link.active {
    background-color: var(--primary-light);
    color: var(--primary);
    font-weight: 600;
}

.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.top-nav {
    height: var(--header-height);
    background-color: var(--surface);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1.5rem;
    position: sticky;
    top: 0;
    z-index: 30;
}

.page-body {
    flex: 1;
    padding: 1.75rem;
    max-width: 1280px;
    width: 100%;
    margin: 0 auto;
}

/* Card components */
.card {
    background-color: var(--surface);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.05);
    margin-bottom: 1.5rem;
}

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

.card-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-main);
}

.card-body {
    padding: 1.5rem;
}

/* Grid & Tables */
.grid-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.25rem;
    margin-bottom: 1.5rem;
}

.stat-box {
    background-color: var(--surface);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    padding: 1.25rem 1.5rem;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-weight: 500;
}

.stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-main);
    margin-top: 0.25rem;
}

.table-responsive {
    overflow-x: auto;
}

table.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
    text-align: left;
}

table.data-table th {
    background-color: var(--background);
    padding: 0.75rem 1rem;
    font-weight: 600;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border);
}

table.data-table td {
    padding: 0.875rem 1rem;
    border-bottom: 1px solid var(--border);
    color: var(--text-main);
}

/* Buttons and forms */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: 0.375rem;
    border: 1px solid transparent;
    cursor: pointer;
    text-decoration: none;
    transition: background-color 0.15s ease;
}

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

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

.btn-danger {
    background-color: var(--danger);
    color: #ffffff;
}

.btn-danger:hover {
    background-color: #dc2626;
}

.btn-warning {
    background-color: var(--warning);
    color: #ffffff;
}

.btn-warning:hover {
    background-color: #d97706;
}

.btn-secondary {
    background-color: var(--surface);
    border-color: var(--border);
    color: var(--text-main);
}

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

.btn-sm {
    padding: 0.25rem 0.625rem;
    font-size: 0.75rem;
}

.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.625rem;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 9999px;
}

.badge-success {
    background-color: #dcfce7;
    color: #166534;
}

.badge-warning {
    background-color: #fef3c7;
    color: #92400e;
}

.badge-info {
    background-color: #e0f2fe;
    color: #0369a1;
}

.badge-danger {
    background-color: #fee2e2;
    color: #991b1b;
}

.badge-secondary {
    background-color: #f1f5f9;
    color: #475569;
}

.badge-purple {
    background-color: #f3e8ff;
    color: #6b21a8;
}

/* Filter & Action Bars */
.filter-bar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1.5rem;
    background: var(--surface);
    padding: 1rem 1.25rem;
    border-radius: 0.5rem;
    border: 1px solid var(--border);
}

.filter-group {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.75rem;
}

/* Modals */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(15, 23, 42, 0.6);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.modal-overlay.active {
    display: flex;
}

.modal-card {
    background: var(--surface);
    border-radius: 0.5rem;
    max-width: 600px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

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

.modal-header h3 {
    font-size: 1.125rem;
    font-weight: 600;
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
    background: var(--background);
}

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

@media (max-width: 640px) {
    .grid-2, .grid-3 {
        grid-template-columns: 1fr;
    }
}

.text-muted { color: var(--text-muted); }
.text-sm { font-size: 0.8125rem; }
.font-mono { font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace; }

.form-group {
    margin-bottom: 1.25rem;
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.375rem;
    color: var(--text-main);
}

.form-control {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: 0.375rem;
    font-size: 0.875rem;
    background-color: #ffffff;
    color: var(--text-main);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

/* Flash alerts */
.alert {
    padding: 0.75rem 1rem;
    border-radius: 0.375rem;
    font-size: 0.875rem;
    margin-bottom: 1.25rem;
}

.alert-success {
    background-color: #dcfce7;
    color: #166534;
    border: 1px solid #bbf7d0;
}

.alert-danger {
    background-color: #fee2e2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

/* Centralized Branding Footer */
.app-footer {
    background-color: var(--surface);
    border-top: 1px solid var(--border);
    padding: 1.25rem 1.5rem;
    font-size: 0.8125rem;
    color: var(--text-muted);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.branding-credit {
    font-weight: 500;
    color: var(--text-main);
}

.helpline-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    background-color: var(--background);
    padding: 0.25rem 0.625rem;
    border-radius: 0.25rem;
    border: 1px solid var(--border);
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }
    .sidebar.open {
        transform: translateX(0);
    }
    .main-content {
        margin-left: 0;
    }
    .app-footer {
        flex-direction: column;
        align-items: flex-start;
    }
}