/* ================================================================
   Sarki V2 - Unified Design System
   Modern, premium UI framework for Sarki Translation Platform
   ================================================================ */

/* ── Design Tokens ── */
:root {
    /* Primary - Indigo */
    --primary-50: #eef2ff; --primary-100: #e0e7ff; --primary-200: #c7d2fe;
    --primary-300: #a5b4fc; --primary-400: #818cf8; --primary-500: #6366f1;
    --primary-600: #4f46e5; --primary-700: #4338ca; --primary-800: #3730a3;
    --primary-900: #312e81; --primary-950: #1e1b4b;

    /* Teal Accent */
    --teal-50: #f0fdfa; --teal-100: #ccfbf1; --teal-200: #99f6e4;
    --teal-300: #5eead4; --teal-400: #2dd4bf; --teal-500: #14b8a6;
    --teal-600: #0d9488; --teal-700: #0f766e; --teal-800: #115e59;

    /* Semantic Colors */
    --success-50: #f0fdf4; --success-100: #dcfce7; --success-500: #22c55e;
    --success-600: #16a34a; --success-700: #15803d;
    --info-50: #f0f9ff; --info-500: #0ea5e9; --info-600: #0284c7;
    --warning-50: #fffbeb; --warning-500: #f59e0b; --warning-600: #d97706;
    --danger-50: #fef2f2; --danger-500: #ef4444; --danger-600: #dc2626;

    /* Neutral */
    --gray-50: #f9fafb; --gray-100: #f3f4f6; --gray-200: #e5e7eb;
    --gray-300: #d1d5db; --gray-400: #9ca3af; --gray-500: #6b7280;
    --gray-600: #4b5563; --gray-700: #374151; --gray-800: #1f2937;
    --gray-900: #111827; --gray-950: #030712;

    /* Surface & Background */
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;
    --bg-sidebar: #0f172a;
    --bg-sidebar-hover: #1e293b;
    --bg-sidebar-active: rgba(99, 102, 241, 0.15);

    /* Text */
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-tertiary: #94a3b8;
    --text-inverse: #ffffff;
    --text-sidebar: #cbd5e1;
    --text-sidebar-active: #e2e8f0;

    /* Border */
    --border-light: #e2e8f0;
    --border-medium: #cbd5e1;
    --border-sidebar: rgba(255, 255, 255, 0.06);

    /* Shadow */
    --shadow-xs: 0 1px 2px rgb(0 0 0 / 0.04);
    --shadow-sm: 0 1px 3px rgb(0 0 0 / 0.06), 0 1px 2px rgb(0 0 0 / 0.04);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.07), 0 2px 4px -2px rgb(0 0 0 / 0.05);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.08), 0 4px 6px -4px rgb(0 0 0 / 0.04);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.06);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.2);
    --shadow-glow: 0 0 20px rgb(99 102 241 / 0.15);

    /* Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.25rem;
    --radius-3xl: 1.5rem;
    --radius-full: 9999px;

    /* Typography */
    --font-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC',
                  'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    --font-ug: 'Alp Ekran', 'UKIJTuzTom', 'UyghurTuzTom', system-ui, sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, 'SF Mono', Menlo, Consolas, monospace;

    /* Transitions */
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
    --duration-fast: 150ms;
    --duration-base: 200ms;
    --duration-slow: 350ms;

    /* Layout */
    --sidebar-width: 260px;
    --sidebar-collapsed-width: 72px;
    --header-height: 64px;
    --content-max-width: 1400px;
    --content-padding: 32px;

    /* Z-index Scale */
    --z-sidebar: 40;
    --z-overlay: 45;
    --z-header: 50;
    --z-modal: 60;
    --z-toast: 70;
}

/* ── Dark Mode Sidebar Override ── */
[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-tertiary: #64748b;
    --border-light: #334155;
    --border-medium: #475569;
    --bg-sidebar: #020617;
    --bg-sidebar-hover: #0f172a;
}

/* ── Reset & Base ── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

html[dir="rtl"] body {
    direction: rtl;
    text-align: right;
    font-family: var(--font-ug);
}

/* ── App Layout ── */
.s2-layout {
    display: flex;
    min-height: 100vh;
    background: var(--bg-primary);
}

/* ── Sidebar ── */
.s2-sidebar {
    width: var(--sidebar-width);
    background: var(--bg-sidebar);
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: var(--z-sidebar);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    overflow-x: hidden;
    transition: transform var(--duration-slow) var(--ease-out);
    scrollbar-width: thin;
    scrollbar-color: rgba(255,255,255,0.1) transparent;
}

html[dir="rtl"] .s2-sidebar {
    left: auto;
    right: 0;
}

.s2-sidebar::-webkit-scrollbar { width: 4px; }
.s2-sidebar::-webkit-scrollbar-track { background: transparent; }
.s2-sidebar::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 2px; }

.s2-sidebar-header {
    padding: 24px 20px 20px;
    border-bottom: 1px solid var(--border-sidebar);
}

.s2-sidebar-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--text-inverse);
}

.s2-sidebar-brand-icon {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.s2-sidebar-brand-icon svg {
    width: 20px;
    height: 20px;
    color: white;
}

.s2-sidebar-brand-text {
    font-size: 18px;
    font-weight: 800;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, #e2e8f0, #f8fafc);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.s2-sidebar-nav {
    flex: 1;
    padding: 12px 12px;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.s2-nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 14px;
    color: var(--text-sidebar);
    text-decoration: none;
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 14px;
    transition: all var(--duration-fast) ease;
    position: relative;
    white-space: nowrap;
}

.s2-nav-item:hover {
    background: var(--bg-sidebar-hover);
    color: var(--text-sidebar-active);
}

.s2-nav-item.active {
    background: var(--bg-sidebar-active);
    color: #a5b4fc;
}

.s2-nav-item.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 6px;
    bottom: 6px;
    width: 3px;
    background: var(--primary-500);
    border-radius: 0 3px 3px 0;
}

html[dir="rtl"] .s2-nav-item.active::before {
    left: auto;
    right: 0;
    border-radius: 3px 0 0 3px;
}

.s2-nav-item svg {
    width: 20px;
    height: 20px;
    stroke-width: 1.8;
    flex-shrink: 0;
    opacity: 0.7;
    transition: opacity var(--duration-fast);
}

.s2-nav-item:hover svg,
.s2-nav-item.active svg {
    opacity: 1;
}

.s2-nav-item.active svg {
    color: var(--primary-400);
}

.s2-nav-section-label {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: rgba(148, 163, 184, 0.6);
    padding: 16px 14px 6px;
    user-select: none;
}

.s2-nav-divider {
    height: 1px;
    background: var(--border-sidebar);
    margin: 8px 4px;
}

.s2-sidebar-footer {
    padding: 16px 12px;
    border-top: 1px solid var(--border-sidebar);
}

.s2-sidebar-footer .s2-nav-item {
    color: var(--text-sidebar);
}

.s2-sidebar-footer .s2-nav-item.danger {
    color: #f87171;
}

.s2-sidebar-footer .s2-nav-item.danger:hover {
    background: rgba(248, 113, 113, 0.1);
}

.s2-sidebar-lang {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 14px;
    margin-bottom: 2px;
}
.s2-sidebar-lang-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-sidebar-muted, #94a3b8);
}
.s2-lang-switch {
    display: flex;
    gap: 4px;
    background: rgba(0, 0, 0, 0.15);
    border-radius: 8px;
    padding: 3px;
}
.s2-lang-btn {
    padding: 4px 10px;
    font-size: 12px;
    font-weight: 600;
    border-radius: 6px;
    color: var(--text-sidebar-muted, #94a3b8);
    text-decoration: none;
    transition: all 0.15s;
    white-space: nowrap;
}
.s2-lang-btn:hover {
    color: var(--text-sidebar, #e2e8f0);
    background: rgba(255, 255, 255, 0.08);
}
.s2-lang-btn.active {
    background: var(--primary-600);
    color: white;
    box-shadow: 0 2px 6px rgba(99, 102, 241, 0.3);
}

/* Mobile header language */
.s2-mobile-header-right {
    display: flex;
    align-items: center;
    gap: 8px;
}
.s2-mobile-lang {
    display: flex;
    gap: 2px;
    background: var(--bg-tertiary, #f1f5f9);
    border-radius: 8px;
    padding: 2px;
}
.s2-mobile-lang-btn {
    padding: 4px 10px;
    font-size: 12px;
    font-weight: 700;
    border-radius: 6px;
    color: var(--text-tertiary, #94a3b8);
    text-decoration: none;
    transition: all 0.15s;
}
.s2-mobile-lang-btn:hover {
    color: var(--text-primary, #0f172a);
}
.s2-mobile-lang-btn.active {
    background: var(--primary-600, #4f46e5);
    color: white;
    box-shadow: 0 1px 4px rgba(99, 102, 241, 0.3);
}

.s2-sidebar-user {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 14px;
    margin-bottom: 4px;
}

.s2-sidebar-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.s2-sidebar-avatar svg {
    width: 18px;
    height: 18px;
    color: white;
    stroke-width: 2;
}

.s2-sidebar-user-info {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.s2-sidebar-user-name {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-sidebar-active);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.s2-sidebar-user-role {
    font-size: 11px;
    color: rgba(148, 163, 184, 0.7);
}

.s2-mobile-brand {
    display: flex;
    align-items: center;
    gap: 8px;
}

.s2-mobile-brand-icon {
    width: 28px;
    height: 28px;
    background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.s2-mobile-brand-icon svg {
    color: white;
}

.s2-mobile-brand-text {
    font-size: 16px;
    font-weight: 800;
    color: var(--primary-600);
    letter-spacing: -0.02em;
}

/* ── Main Content ── */
.s2-main {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-width: 0;
    min-height: 100vh;
    transition: margin var(--duration-slow) var(--ease-out);
}

html[dir="rtl"] .s2-main {
    margin-left: 0;
    margin-right: var(--sidebar-width);
}

.s2-page {
    padding: var(--content-padding);
    max-width: var(--content-max-width);
    margin: 0 auto;
}

/* ── Mobile Header ── */
.s2-mobile-header {
    display: none;
    position: sticky;
    top: 0;
    z-index: var(--z-header);
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-light);
    padding: 0 16px;
    height: var(--header-height);
    align-items: center;
    justify-content: space-between;
}

.s2-mobile-header-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.s2-mobile-menu-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: transparent;
    border-radius: var(--radius-md);
    color: var(--text-primary);
    cursor: pointer;
    transition: background var(--duration-fast);
}

.s2-mobile-menu-btn:hover { background: var(--bg-tertiary); }

.s2-mobile-brand {
    font-size: 16px;
    font-weight: 800;
    color: var(--primary-600);
}

.s2-mobile-header-right {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* ── Mobile Overlay ── */
.s2-overlay {
    position: fixed;
    inset: 0;
    background: rgb(0 0 0 / 0.4);
    backdrop-filter: blur(4px);
    z-index: calc(var(--z-sidebar) - 1);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--duration-base);
}

.s2-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

/* ── Page Header ── */
.s2-page-header {
    margin-bottom: 28px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
}

.s2-page-header-left h1 {
    font-size: 24px;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -0.02em;
    line-height: 1.3;
}

.s2-page-header-left p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-top: 4px;
}

.s2-page-header-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

/* ── Cards ── */
.s2-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: box-shadow var(--duration-base), border-color var(--duration-base);
}

.s2-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--border-medium);
}

.s2-card-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.s2-card-body { padding: 24px; }
.s2-card-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border-light);
    background: var(--bg-tertiary);
}

/* ── KPI Cards ── */
.s2-kpi-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
    margin-bottom: 28px;
}

.s2-kpi {
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    padding: 20px 24px;
    display: flex;
    align-items: center;
    gap: 16px;
    transition: all var(--duration-base);
}

.s2-kpi:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.s2-kpi-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.s2-kpi-icon.blue { background: var(--primary-50); color: var(--primary-600); }
.s2-kpi-icon.green { background: var(--success-50); color: var(--success-600); }
.s2-kpi-icon.amber { background: var(--warning-50); color: var(--warning-600); }
.s2-kpi-icon.red { background: var(--danger-50); color: var(--danger-600); }
.s2-kpi-icon.teal { background: var(--teal-50); color: var(--teal-600); }

.s2-kpi-body { flex: 1; min-width: 0; }

.s2-kpi-label {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.s2-kpi-value {
    font-size: 28px;
    font-weight: 800;
    color: var(--text-primary);
    line-height: 1.2;
    letter-spacing: -0.02em;
    font-variant-numeric: tabular-nums;
}

.s2-kpi-change {
    font-size: 12px;
    font-weight: 600;
    margin-top: 4px;
}

.s2-kpi-change.up { color: var(--success-600); }
.s2-kpi-change.down { color: var(--danger-600); }

/* ── Buttons ── */
.s2-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border: 1px solid transparent;
    border-radius: var(--radius-lg);
    font-size: 14px;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--duration-fast) ease;
    white-space: nowrap;
    text-decoration: none;
    line-height: 1.4;
}

.s2-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

.s2-btn svg { width: 16px; height: 16px; }

.s2-btn-primary {
    background: var(--primary-600);
    color: white;
}
.s2-btn-primary:hover:not(:disabled) {
    background: var(--primary-700);
    box-shadow: var(--shadow-glow);
    transform: translateY(-1px);
}

.s2-btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border-color: var(--border-light);
}
.s2-btn-secondary:hover:not(:disabled) {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-color: var(--border-medium);
}

.s2-btn-ghost {
    background: transparent;
    color: var(--text-secondary);
}
.s2-btn-ghost:hover:not(:disabled) {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.s2-btn-danger {
    background: var(--danger-600);
    color: white;
}
.s2-btn-danger:hover:not(:disabled) {
    background: #b91c1c;
    transform: translateY(-1px);
}

.s2-btn-success {
    background: var(--success-600);
    color: white;
}
.s2-btn-success:hover:not(:disabled) {
    background: var(--success-700);
    transform: translateY(-1px);
}

.s2-btn-outline {
    background: transparent;
    color: var(--primary-600);
    border-color: var(--primary-300);
}
.s2-btn-outline:hover:not(:disabled) {
    background: var(--primary-50);
    border-color: var(--primary-400);
}

.s2-btn-sm { padding: 6px 14px; font-size: 13px; }
.s2-btn-lg { padding: 12px 28px; font-size: 15px; }
.s2-btn-xl { padding: 14px 32px; font-size: 16px; }

.s2-btn-icon {
    width: 36px;
    height: 36px;
    padding: 0;
    border-radius: var(--radius-md);
}
.s2-btn-icon.sm { width: 30px; height: 30px; }

/* ── Form Controls ── */
.s2-form-group { margin-bottom: 16px; }

.s2-form-label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.s2-form-input,
.s2-form-select,
.s2-form-textarea {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    font-size: 14px;
    font-family: inherit;
    color: var(--text-primary);
    background: var(--bg-secondary);
    transition: border-color var(--duration-fast), box-shadow var(--duration-fast);
}

.s2-form-input:focus,
.s2-form-select:focus,
.s2-form-textarea:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: 0 0 0 3px rgb(99 102 241 / 0.12);
}

.s2-form-input::placeholder,
.s2-form-textarea::placeholder {
    color: var(--text-tertiary);
}

.s2-form-error {
    font-size: 13px;
    color: var(--danger-600);
    margin-top: 4px;
    display: none;
}

.s2-form-hint {
    font-size: 12px;
    color: var(--text-tertiary);
    margin-top: 4px;
}

/* ── Badges ── */
.s2-badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 10px;
    border-radius: var(--radius-full);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.02em;
}

.s2-badge-primary { background: var(--primary-50); color: var(--primary-700); }
.s2-badge-success { background: var(--success-50); color: var(--success-700); }
.s2-badge-warning { background: var(--warning-50); color: var(--warning-600); }
.s2-badge-danger { background: var(--danger-50); color: var(--danger-600); }
.s2-badge-info { background: var(--info-50); color: var(--info-600); }
.s2-badge-neutral { background: var(--bg-tertiary); color: var(--text-secondary); }

/* ── Tables ── */
.s2-table-wrap {
    overflow-x: auto;
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    background: var(--bg-secondary);
}

.s2-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

.s2-table th {
    padding: 12px 16px;
    text-align: left;
    font-weight: 600;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-tertiary);
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-light);
}

html[dir="rtl"] .s2-table th { text-align: right; }

.s2-table td {
    padding: 14px 16px;
    border-bottom: 1px solid var(--border-light);
    color: var(--text-primary);
}

.s2-table tr:last-child td { border-bottom: none; }

.s2-table tr:hover td { background: var(--bg-tertiary); }

/* ── Tabs ── */
.s2-tabs {
    display: flex;
    gap: 4px;
    border-bottom: 1px solid var(--border-light);
    margin-bottom: 24px;
    overflow-x: auto;
}

.s2-tab {
    padding: 10px 18px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
    border: none;
    background: transparent;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
    transition: all var(--duration-fast);
    white-space: nowrap;
}

.s2-tab:hover { color: var(--text-primary); }

.s2-tab.active {
    color: var(--primary-600);
    border-bottom-color: var(--primary-600);
}

/* ── Empty State ── */
.s2-empty {
    text-align: center;
    padding: 48px 24px;
    color: var(--text-tertiary);
}

.s2-empty-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 16px;
    opacity: 0.4;
}

.s2-empty-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.s2-empty-desc { font-size: 14px; }

/* ── Toast Notifications ── */
.s2-toast {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: var(--z-toast);
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    padding: 14px 20px;
    box-shadow: var(--shadow-xl);
    font-size: 14px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 10px;
    transform: translateY(100px);
    opacity: 0;
    transition: all var(--duration-slow) var(--ease-spring);
}

.s2-toast.show {
    transform: translateY(0);
    opacity: 1;
}

.s2-toast.success { border-left: 4px solid var(--success-500); }
.s2-toast.error { border-left: 4px solid var(--danger-500); }
.s2-toast.warning { border-left: 4px solid var(--warning-500); }

html[dir="rtl"] .s2-toast { right: auto; left: 24px; }
html[dir="rtl"] .s2-toast.success,
html[dir="rtl"] .s2-toast.error,
html[dir="rtl"] .s2-toast.warning { border-left: none; border-right: 4px solid; }

/* ── Grid Utilities ── */
.s2-grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.s2-grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.s2-grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }

.s2-flex { display: flex; }
.s2-flex-center { display: flex; align-items: center; justify-content: center; }
.s2-flex-between { display: flex; align-items: center; justify-content: space-between; }
.s2-gap-2 { gap: 8px; }
.s2-gap-3 { gap: 12px; }
.s2-gap-4 { gap: 16px; }
.s2-gap-6 { gap: 24px; }

/* ── Spacing Utilities ── */
.s2-mb-4 { margin-bottom: 16px; }
.s2-mb-6 { margin-bottom: 24px; }
.s2-mb-8 { margin-bottom: 32px; }
.s2-mt-4 { margin-top: 16px; }
.s2-mt-6 { margin-top: 24px; }

/* ── Text Utilities ── */
.s2-text-sm { font-size: 14px; }
.s2-text-xs { font-size: 12px; }
.s2-text-muted { color: var(--text-tertiary); }
.s2-text-semibold { font-weight: 600; }
.s2-text-bold { font-weight: 700; }
.s2-truncate {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
    background: var(--border-medium);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover { background: var(--gray-400); }

/* ── Animations ── */
@keyframes s2-fade-in {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes s2-slide-up {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes s2-pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

@keyframes s2-spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.s2-animate-in { animation: s2-fade-in var(--duration-slow) var(--ease-out); }
.s2-animate-slide { animation: s2-slide-up var(--duration-slow) var(--ease-out); }

/* ── Backward Compatibility Aliases ── */
/* Maps old class names from style.css to new s2- prefixed classes */
.app-layout { display: flex; min-height: 100vh; background: var(--bg-primary); }
.app-sidebar {
    width: var(--sidebar-width);
    background: var(--bg-sidebar);
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: var(--z-sidebar);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    overflow-x: hidden;
    transition: transform var(--duration-slow) var(--ease-out);
    scrollbar-width: thin;
    scrollbar-color: rgba(255,255,255,0.1) transparent;
}
html[dir="rtl"] .app-sidebar { left: auto; right: 0; }
.app-sidebar::-webkit-scrollbar { width: 4px; }
.app-sidebar::-webkit-scrollbar-track { background: transparent; }
.app-sidebar::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 2px; }
.app-main {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-width: 0;
    min-height: 100vh;
    transition: margin var(--duration-slow) var(--ease-out);
    display: flex;
    flex-direction: column;
}
html[dir="rtl"] .app-main { margin-left: 0; margin-right: var(--sidebar-width); }
.app-content { flex: 1; padding: var(--content-padding); max-width: var(--content-max-width); margin: 0 auto; width: 100%; }
.app-footer { padding: 16px 24px; text-align: center; color: var(--text-tertiary); font-size: 13px; border-top: 1px solid var(--border-light); }

/* Map sidebar classes from _nav.php to s2 equivalents */
.sidebar-header { padding: 24px 20px 20px; border-bottom: 1px solid var(--border-sidebar); }
.sidebar-brand { display: flex; align-items: center; gap: 12px; text-decoration: none; color: var(--text-inverse); }
.sidebar-brand-icon {
    width: 36px; height: 36px;
    background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
    border-radius: var(--radius-lg);
    display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}
.sidebar-brand-icon svg { width: 20px; height: 20px; color: white; }
.sidebar-brand-text {
    font-size: 18px; font-weight: 800; letter-spacing: -0.02em;
    background: linear-gradient(135deg, #e2e8f0, #f8fafc);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.sidebar-nav { flex: 1; padding: 12px; display: flex; flex-direction: column; gap: 2px; }
.sidebar-nav .nav-section-label {
    font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em;
    color: rgba(148, 163, 184, 0.6); padding: 16px 14px 6px; user-select: none;
}
.sidebar-nav .nav-item {
    display: flex; align-items: center; gap: 12px; padding: 10px 14px;
    color: var(--text-sidebar); text-decoration: none; border-radius: var(--radius-md);
    font-weight: 500; font-size: 14px; transition: all var(--duration-fast) ease;
    position: relative; white-space: nowrap;
}
.sidebar-nav .nav-item:hover { background: var(--bg-sidebar-hover); color: var(--text-sidebar-active); }
.sidebar-nav .nav-item.active { background: var(--bg-sidebar-active); color: #a5b4fc; }
.sidebar-nav .nav-item.active::before {
    content: ''; position: absolute; left: 0; top: 6px; bottom: 6px; width: 3px;
    background: var(--primary-500); border-radius: 0 3px 3px 0;
}
html[dir="rtl"] .sidebar-nav .nav-item.active::before { left: auto; right: 0; border-radius: 3px 0 0 3px; }
.sidebar-nav .nav-item svg { width: 20px; height: 20px; stroke-width: 1.8; flex-shrink: 0; opacity: 0.7; transition: opacity var(--duration-fast); }
.sidebar-nav .nav-item:hover svg, .sidebar-nav .nav-item.active svg { opacity: 1; }
.sidebar-nav .nav-item.active svg { color: var(--primary-400); }

.sidebar-footer { padding: 16px 12px; border-top: 1px solid var(--border-sidebar); }
.sidebar-footer .nav-item { color: var(--text-sidebar); }
.sidebar-footer .nav-item.nav-item-logout { color: #f87171; }
.sidebar-footer .nav-item.nav-item-logout:hover { background: rgba(248, 113, 113, 0.1); }
.sidebar-user-info { display: flex; align-items: center; gap: 12px; padding: 12px 14px; margin-bottom: 4px; }
.sidebar-user-avatar {
    width: 36px; height: 36px; border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
    display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}
.sidebar-user-avatar svg { width: 18px; height: 18px; color: white; stroke-width: 2; }
.sidebar-user-details { display: flex; flex-direction: column; min-width: 0; }
.sidebar-user-name { font-size: 13px; font-weight: 600; color: var(--text-sidebar-active); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.sidebar-user-role { font-size: 11px; color: rgba(148, 163, 184, 0.7); }
.sidebar-footer-links { display: flex; flex-direction: column; gap: 2px; }
.sidebar-footer-links .nav-item { font-size: 13px; padding: 8px 14px; }
.sidebar-footer-links .nav-item.nav-item-subtle { opacity: 0.8; }
.sidebar-footer-links .nav-item.nav-item-subtle:hover { opacity: 1; }

/* Mobile header backward compat */
.mobile-header {
    display: none; position: sticky; top: 0; z-index: var(--z-header);
    background: rgba(255, 255, 255, 0.9); backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-light); padding: 0 16px;
    height: var(--header-height); align-items: center; justify-content: space-between;
}
.mobile-menu-btn {
    width: 40px; height: 40px; display: flex; align-items: center; justify-content: center;
    border: none; background: transparent; border-radius: var(--radius-md); color: var(--text-primary); cursor: pointer;
}
.mobile-menu-btn:hover { background: var(--bg-tertiary); }
.mobile-brand { display: flex; align-items: center; gap: 8px; }
.mobile-brand-icon {
    width: 28px; height: 28px; background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
    border-radius: 8px; display: flex; align-items: center; justify-content: center;
}
.mobile-brand-icon svg { color: white; }
.mobile-brand-text { font-size: 16px; font-weight: 800; color: var(--primary-600); letter-spacing: -0.02em; }
.mobile-header-spacer { width: 40px; }
.app-overlay {
    position: fixed; inset: 0; background: rgb(0 0 0 / 0.4); backdrop-filter: blur(4px);
    z-index: calc(var(--z-sidebar) - 1); opacity: 0; pointer-events: none; transition: opacity var(--duration-fast);
}
.app-overlay.active { opacity: 1; pointer-events: auto; }

/* ── Responsive for backward compat ── */
@media (max-width: 768px) {
    .app-sidebar { transform: translateX(-100%); }
    html[dir="rtl"] .app-sidebar { transform: translateX(100%); }
    .app-sidebar.open { transform: translateX(0); }
    .app-main { margin-left: 0 !important; }
    html[dir="rtl"] .app-main { margin-right: 0 !important; }
    .mobile-header { display: flex; }
    .s2-mobile-header { display: flex; }
    .s2-sidebar { transform: translateX(-100%); }
    html[dir="rtl"] .s2-sidebar { transform: translateX(100%); }
    .s2-sidebar.open { transform: translateX(0); }
    .s2-main { margin-left: 0 !important; }
    html[dir="rtl"] .s2-main { margin-right: 0 !important; }
}

/* ── Common Admin Styles ── */
.admin-page-header {
    margin-bottom: 24px;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 16px;
    flex-wrap: wrap;
}
.admin-page-header h2 {
    font-size: 24px;
    font-weight: 800;
    color: var(--text-primary);
    margin: 0;
}
.admin-page-header p {
    font-size: 14px;
    color: var(--text-tertiary);
    margin: 4px 0 0;
}
.admin-card {
    background: var(--surface);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
    padding: 24px;
}
.data-table {
    width: 100%;
    border-collapse: collapse;
}
.data-table th {
    text-align: left;
    padding: 12px 16px;
    font-weight: 600;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-tertiary);
    border-bottom: 1px solid var(--border-light);
    white-space: nowrap;
}
html[dir="rtl"] .data-table th { text-align: right; }
.data-table td {
    padding: 12px 16px;
    font-size: 14px;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-light);
    vertical-align: middle;
}
.data-table tbody tr { transition: background var(--duration-fast); }
.data-table tbody tr:hover { background: var(--bg-tertiary); }
.data-table tbody tr:last-child td { border-bottom: none; }

/* Tag/Badge system */
.tag {
    display: inline-flex; align-items: center; gap: 4px;
    padding: 2px 10px; border-radius: 999px; font-size: 12px; font-weight: 600;
    white-space: nowrap;
}
.tag-success { background: var(--success-50); color: var(--success-700); }
.tag-warning { background: var(--warning-50); color: var(--warning-700); }
.tag-danger { background: var(--danger-50); color: var(--danger-700); }
.tag-info { background: #eef2ff; color: #4338ca; }
.tag-gray { background: var(--gray-100); color: var(--gray-600); }
.badge {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 4px 12px; border-radius: 999px; font-size: 12px; font-weight: 600;
}
.badge-dot { width: 6px; height: 6px; border-radius: 50%; display: inline-block; }
.badge-success { background: var(--success-50); color: var(--success-700); }
.badge-success .badge-dot { background: var(--success-500); }
.badge-warning { background: var(--warning-50); color: var(--warning-700); }
.badge-warning .badge-dot { background: var(--warning-500); }
.badge-danger { background: var(--danger-50); color: var(--danger-700); }
.badge-danger .badge-dot { background: var(--danger-500); }

/* Modal system */
.modal { display: none; position: fixed; inset: 0; z-index: 1200; }
.modal.active { display: flex; align-items: center; justify-content: center; }
.admin-modal-overlay {
    position: absolute; inset: 0; background: rgb(0 0 0 / 0.5); backdrop-filter: blur(4px);
}
.modal-content {
    position: relative; background: var(--surface); border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl); width: 90%; max-width: 600px; max-height: 90vh;
    overflow-y: auto; animation: s2-slide-up 0.3s var(--ease-out);
}
.modal-header {
    display: flex; justify-content: space-between; align-items: center;
    padding: 20px 24px; border-bottom: 1px solid var(--border-light);
}
.modal-header h3 { font-size: 18px; font-weight: 700; margin: 0; }
.close-btn {
    width: 32px; height: 32px; border: none; background: var(--bg-tertiary);
    border-radius: 8px; font-size: 16px; cursor: pointer; color: var(--text-secondary);
    display: flex; align-items: center; justify-content: center;
}
.close-btn:hover { background: var(--border-medium); }
.modal-body { padding: 24px; }
.modal-footer { padding: 16px 24px; border-top: 1px solid var(--border-light); display: flex; justify-content: flex-end; gap: 12px; }

/* Form system for admin pages */
.form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.form-group { margin-bottom: 16px; }
.form-label { display: block; font-size: 13px; font-weight: 600; color: var(--text-secondary); margin-bottom: 6px; }
.form-input {
    width: 100%; padding: 10px 14px; border-radius: var(--radius-md);
    border: 1px solid var(--border-medium); background: var(--surface);
    color: var(--text-primary); font-size: 14px; transition: all var(--duration-fast);
    box-sizing: border-box;
}
.form-input:focus { outline: none; border-color: var(--primary-500); box-shadow: 0 0 0 3px var(--primary-100); }
.form-help { font-size: 12px; color: var(--text-tertiary); margin-top: 4px; }

/* Icon buttons */
.btn-icon {
    width: 32px; height: 32px; border: none; background: transparent;
    border-radius: var(--radius-md); cursor: pointer; display: inline-flex;
    align-items: center; justify-content: center; font-size: 16px;
    transition: background var(--duration-fast);
}
.btn-icon:hover { background: var(--bg-tertiary); }
.btn-edit:hover { background: #eef2ff; }
.btn-delete:hover { background: #fef2f2; }

/* Page header for PC pages */
.page-header {
    display: flex; justify-content: space-between; align-items: center;
    padding: 16px 0; margin-bottom: 8px; flex-wrap: wrap; gap: 12px;
}
.page-title { font-size: 20px; font-weight: 800; color: var(--text-primary); margin: 0; }
.s2-animate-pulse { animation: s2-pulse 2s ease-in-out infinite; }
.s2-animate-spin { animation: s2-spin 1s linear infinite; }

/* ── Skeleton Loading ── */
.s2-skeleton {
    background: linear-gradient(90deg, var(--bg-tertiary) 25%, var(--bg-primary) 50%, var(--bg-tertiary) 75%);
    background-size: 200% 100%;
    animation: s2-skeleton-shimmer 1.5s ease infinite;
    border-radius: var(--radius-md);
}

@keyframes s2-skeleton-shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ── Responsive ── */
@media (max-width: 768px) {
    :root {
        --content-padding: 16px;
    }

    .s2-sidebar {
        transform: translateX(-100%);
        width: 280px;
    }

    html[dir="rtl"] .s2-sidebar {
        transform: translateX(100%);
    }

    .s2-sidebar.open {
        transform: translateX(0);
    }

    .s2-main {
        margin-left: 0 !important;
        margin-right: 0 !important;
    }

    .s2-mobile-header { display: flex; }

    .s2-page-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .s2-kpi-grid { grid-template-columns: 1fr 1fr; }
    .s2-grid-2, .s2-grid-3, .s2-grid-4 { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
    .s2-kpi-grid { grid-template-columns: 1fr; }
    .s2-kpi-value { font-size: 22px; }
    .s2-page-header-left h1 { font-size: 20px; }
}

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

:focus-visible {
    outline: 2px solid var(--primary-500);
    outline-offset: 2px;
}