:root {
    --primary: #d97706;
    --primary-hover: #b45309;
    --primary-light: #fef3c7;
    --primary-contrast: #ffffff;

    --bg-base: #f8fafc;
    --bg-surface: #ffffff;
    --bg-elevated: #ffffff;
    --bg-hover: #f1f5f9;

    --border-subtle: #e2e8f0;
    --border-strong: #cbd5e1;
    --border-focus: #d97706;

    --text-main: #0f172a;
    --text-muted: #64748b;
    --text-disabled: #94a3b8;

    --status-success-bg: #dcfce7;
    --status-success-text: #166534;
    --status-warning-bg: #ffedd5;
    --status-warning-text: #9a3412;
    --status-danger-bg: #fee2e2;
    --status-danger-text: #991b1b;
    --status-info-bg: #e0f2fe;
    --status-info-text: #075985;

    --radius-sm: 3px;
    --radius: 5px;
    --radius-md: 6px;

    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

[dir="rtl"] {
    font-family: "Segoe UI", Tahoma, Arial, sans-serif;
}

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

body {
    background-color: var(--bg-base);
    color: var(--text-main);
    font-family: var(--font-sans);
    font-size: 14px;
    line-height: 1.5;
    min-height: 100vh;
}

/* Base layout */
.app-container {
    display: flex;
    min-height: 100vh;
    flex-direction: column;
}

.app-shell {
    display: flex;
    flex: 1;
}

.sidebar {
    width: 240px;
    background-color: #0f172a;
    color: #f8fafc;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    padding: 1rem;
    border-bottom: 1px solid #1e293b;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.sidebar-header .brand-logo {
    width: 28px;
    height: 28px;
    background: #d97706;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: #ffffff;
}

.sidebar-menu {
    flex: 1;
    padding: 1rem 0.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius);
    color: #cbd5e1;
    text-decoration: none;
    font-weight: 500;
    transition: background-color 0.15s, color 0.15s;
}

.nav-link:hover {
    background-color: #1e293b;
    color: #ffffff;
}

.nav-link.active {
    background-color: #d97706;
    color: #ffffff;
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-base);
    min-width: 0;
}

.topbar {
    height: 56px;
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border-subtle);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1.5rem;
}

.content-body {
    flex: 1;
    padding: 1.5rem;
}

/* Enterprise Primitives */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.4rem 0.85rem;
    font-size: 13px;
    font-weight: 500;
    border-radius: var(--radius);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 0.15s ease-in-out;
    text-decoration: none;
}

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

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

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

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

.btn-sm {
    padding: 0.25rem 0.5rem;
    font-size: 12px;
}

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

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.15rem 0.5rem;
    font-size: 11px;
    font-weight: 600;
    border-radius: var(--radius-sm);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.badge-success {
    background-color: var(--status-success-bg);
    color: var(--status-success-text);
}

.badge-warning {
    background-color: var(--status-warning-bg);
    color: var(--status-warning-text);
}

.badge-danger {
    background-color: var(--status-danger-bg);
    color: var(--status-danger-text);
}

.badge-info {
    background-color: var(--status-info-bg);
    color: var(--status-info-text);
}

/* Tables */
.table-container {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius);
    overflow: hidden;
}

.enterprise-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
    text-align: start;
}

.enterprise-table th {
    background-color: var(--bg-base);
    color: var(--text-muted);
    font-weight: 600;
    padding: 0.6rem 0.85rem;
    border-bottom: 1px solid var(--border-subtle);
    text-transform: uppercase;
    font-size: 11px;
    letter-spacing: 0.04em;
}

.enterprise-table td {
    padding: 0.65rem 0.85rem;
    border-bottom: 1px solid var(--border-subtle);
    color: var(--text-main);
}

.enterprise-table tr:hover td {
    background-color: var(--bg-hover);
}

/* Bidi isolation */
bdi, .bdi-text {
    unicode-bidi: isolate;
    direction: ltr;
}

/* Notifications Toast */
.toast-container {
    position: fixed;
    bottom: 1.5rem;
    inset-inline-end: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    z-index: 9999;
}

.toast {
    display: flex;
    align-items: center;
    padding: 0.75rem 1rem;
    border-radius: var(--radius);
    background-color: #1e293b;
    color: #ffffff;
    font-size: 13px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    min-width: 280px;
    max-width: 420px;
}

.toast-success {
    border-inline-start: 4px solid #22c55e;
}

.toast-error {
    border-inline-start: 4px solid #ef4444;
}

.toast-warning {
    border-inline-start: 4px solid #f59e0b;
}

.toast-info {
    border-inline-start: 4px solid #0ea5e9;
}

/* Accessibility & Keyboard Navigation */
:focus-visible {
    outline: 2px solid var(--border-focus);
    outline-offset: 2px;
}

.btn:focus-visible,
.form-control:focus-visible,
.nav-link:focus-visible {
    outline: 2px solid var(--border-focus);
    outline-offset: 2px;
}

.btn:disabled,
.btn[disabled] {
    opacity: 0.65;
    cursor: not-allowed;
    pointer-events: none;
}

/* Screen reader only utility */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* RTL Directional mirroring */
[dir="rtl"] .icon-directional {
    transform: scaleX(-1);
    display: inline-block;
}

/* Form control accessibility and styling */
.form-label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 0.35rem;
}

.form-control {
    width: 100%;
    padding: 0.5rem 0.75rem;
    font-size: 13px;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius);
    background-color: var(--bg-surface);
    color: var(--text-main);
    transition: border-color 0.15s, box-shadow 0.15s;
}

.form-control:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 2px rgba(217, 119, 6, 0.2);
}

/* Mobile responsive navigation & layout */
@media (max-width: 768px) {
    .app-shell {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
    }

    .hide-mobile {
        display: none !important;
    }
}