/* ===================================
   Modern HR Management System
   Professional & Clean Design
   =================================== */

:root {
    /* Modern Color Palette */
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #64748b;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --info: #06b6d4;
    
    /* Sidebar Colors */
    --sidebar-bg: linear-gradient(180deg, #1e293b 0%, #0f172a 100%);
    --sidebar-hover: rgba(99, 102, 241, 0.15);
    --sidebar-active: linear-gradient(90deg, #6366f1 0%, #818cf8 100%);
    
    /* Light Theme */
    --body-bg: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Transition */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Theme */
[data-theme="dark"] {
    --body-bg: #0f172a;
    --card-bg: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --border-color: #334155;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
    --sidebar-bg: linear-gradient(180deg, #0f172a 0%, #020617 100%);
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 15px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--body-bg);
    color: var(--text-primary);
    line-height: 1.6;
    transition: var(--transition);
    overflow-x: hidden;
}

/* ==================== HEADER ==================== */
.header {
    position: fixed;
    top: 0;
    left: 280px;
    right: 0;
    height: 70px;
    background: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
    padding: 0 2rem;
    z-index: 1000;
    transition: var(--transition);
}

.header-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.header-brand a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
}

.header-brand a:hover {
    color: var(--primary-dark);
}

.header-brand i {
    font-size: 1.75rem;
}

.header-nav {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.header-nav-item {
    position: relative;
}

.header-nav-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: 0.5rem;
    transition: var(--transition);
    font-weight: 500;
}

.header-nav-link:hover {
    background: var(--body-bg);
    color: var(--primary);
}

.theme-toggle {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.theme-toggle:hover {
    background: var(--body-bg);
    border-color: var(--primary);
    color: var(--primary);
}

/* ==================== SIDEBAR ==================== */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 280px;
    background: var(--card-bg);
    border-right: 1px solid var(--border-color);
    color: var(--text-primary);
    overflow-y: auto;
    overflow-x: hidden;
    transition: var(--transition);
    z-index: 999;
    box-shadow: var(--shadow-sm);
}

.sidebar::-webkit-scrollbar {
    width: 6px;
}

.sidebar::-webkit-scrollbar-track {
    background: transparent;
}

.sidebar::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
}

.sidebar-header {
    padding: 1.5rem 1.25rem;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.1rem;
    font-weight: 600;
    letter-spacing: -0.025em;
}

.sidebar-logo i {
    font-size: 1.5rem;
    color: var(--primary);
}

.sidebar-menu {
    list-style: none;
    padding: 1rem 0;
}

.sidebar-menu-item {
    margin: 0.25rem 0;
}

.sidebar-menu-link {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.875rem 1.25rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
    position: relative;
    font-weight: 500;
    margin: 0 0.75rem;
    border-radius: 0.75rem;
}

.sidebar-menu-link::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: transparent;
    border-radius: 0 3px 3px 0;
    transition: var(--transition);
}

.sidebar-menu-link:hover {
    background: var(--body-bg);
    color: var(--primary);
}

.sidebar-menu-link.active {
    background: linear-gradient(90deg, rgba(99, 102, 241, 0.1) 0%, rgba(129, 140, 248, 0.1) 100%);
    color: var(--primary);
}

.sidebar-menu-link.active::before {
    background: var(--primary);
}

.sidebar-menu-icon {
    width: 24px;
    font-size: 1.125rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.sidebar-menu-text {
    font-size: 0.95rem;
}

/* ==================== MAIN CONTENT ==================== */
.main-content {
    margin-top: 70px;
    margin-left: 280px;
    padding: 2rem;
    min-height: calc(100vh - 70px);
    transition: var(--transition);
}

/* ==================== CARDS ==================== */
.card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    overflow: hidden;
}

.card:hover {
    box-shadow: var(--shadow);
}

.card-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    background: transparent;
}

.card-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.card-body {
    padding: 1.5rem;
}

/* ==================== STAT CARDS ==================== */
.stat-card {
    position: relative;
    padding: 2rem;
    text-align: center;
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    background: var(--card-bg);
    overflow: hidden;
    transition: var(--transition);
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--primary);
    opacity: 0;
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.stat-card:hover::before {
    opacity: 1;
}

.stat-card-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: #ffffff;
    border-radius: 1rem;
    box-shadow: 0 4px 6px -1px rgba(99, 102, 241, 0.3);
}

.stat-card:nth-child(2) .stat-card-icon {
    background: linear-gradient(135deg, #10b981 0%, #34d399 100%);
    box-shadow: 0 4px 6px -1px rgba(16, 185, 129, 0.3);
}

.stat-card:nth-child(3) .stat-card-icon {
    background: linear-gradient(135deg, #f59e0b 0%, #fbbf24 100%);
    box-shadow: 0 4px 6px -1px rgba(245, 158, 11, 0.3);
}

.stat-card:nth-child(4) .stat-card-icon {
    background: linear-gradient(135deg, #ef4444 0%, #f87171 100%);
    box-shadow: 0 4px 6px -1px rgba(239, 68, 68, 0.3);
}

.stat-card-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    letter-spacing: -0.025em;
}

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

/* ==================== BUTTONS ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    font-size: 0.9375rem;
    font-weight: 500;
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    line-height: 1.5;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: #ffffff;
    box-shadow: 0 2px 4px -1px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
    box-shadow: 0 4px 8px -2px rgba(99, 102, 241, 0.4);
    transform: translateY(-1px);
}

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

.btn-secondary:hover {
    background: #475569;
    transform: translateY(-1px);
}

.btn-success {
    background: linear-gradient(135deg, #10b981 0%, #34d399 100%);
    color: #ffffff;
    box-shadow: 0 2px 4px -1px rgba(16, 185, 129, 0.3);
}

.btn-success:hover {
    box-shadow: 0 4px 8px -2px rgba(16, 185, 129, 0.4);
    transform: translateY(-1px);
}

.btn-danger {
    background: linear-gradient(135deg, #ef4444 0%, #f87171 100%);
    color: #ffffff;
    box-shadow: 0 2px 4px -1px rgba(239, 68, 68, 0.3);
}

.btn-danger:hover {
    box-shadow: 0 4px 8px -2px rgba(239, 68, 68, 0.4);
    transform: translateY(-1px);
}

.btn-warning {
    background: linear-gradient(135deg, #f59e0b 0%, #fbbf24 100%);
    color: #ffffff;
    box-shadow: 0 2px 4px -1px rgba(245, 158, 11, 0.3);
}

.btn-warning:hover {
    box-shadow: 0 4px 8px -2px rgba(245, 158, 11, 0.4);
    transform: translateY(-1px);
}

.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: 0.8125rem;
    border-radius: 0.375rem;
}

.btn-lg {
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
}

/* ==================== FORMS ==================== */
.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
}

.form-control {
    width: 100%;
    padding: 0.625rem 1rem;
    font-size: 0.9375rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    background: var(--card-bg);
    color: var(--text-primary);
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-select {
    width: 100%;
    padding: 0.625rem 1rem;
    font-size: 0.9375rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    background: var(--card-bg);
    color: var(--text-primary);
    transition: var(--transition);
    cursor: pointer;
}

.form-select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

/* ==================== TABLES ==================== */
.table-responsive {
    overflow-x: auto;
}

.table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 0;
}

.table thead th {
    padding: 1rem;
    text-align: left;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    background: var(--body-bg);
    border-bottom: 1px solid var(--border-color);
}

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

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

.table tbody tr:hover {
    background: var(--body-bg);
}

.table-striped tbody tr:nth-child(odd) {
    background: rgba(0, 0, 0, 0.02);
}

[data-theme="dark"] .table-striped tbody tr:nth-child(odd) {
    background: rgba(255, 255, 255, 0.02);
}

/* ==================== BADGES ==================== */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.375rem 0.75rem;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 9999px;
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.badge-success {
    background: rgba(16, 185, 129, 0.1);
    color: #10b981;
}

.badge-danger {
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
}

.badge-warning {
    background: rgba(245, 158, 11, 0.1);
    color: #f59e0b;
}

.badge-info {
    background: rgba(6, 182, 212, 0.1);
    color: #06b6d4;
}

.badge-primary {
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary);
}

/* ==================== ALERTS ==================== */
.alert {
    padding: 1rem 1.25rem;
    border-radius: 0.75rem;
    margin-bottom: 1rem;
    border: 1px solid transparent;
}

.alert-success {
    background: rgba(16, 185, 129, 0.1);
    color: #065f46;
    border-color: rgba(16, 185, 129, 0.2);
}

.alert-error,
.alert-danger {
    background: rgba(239, 68, 68, 0.1);
    color: #991b1b;
    border-color: rgba(239, 68, 68, 0.2);
}

.alert-warning {
    background: rgba(245, 158, 11, 0.1);
    color: #92400e;
    border-color: rgba(245, 158, 11, 0.2);
}

.alert-info {
    background: rgba(6, 182, 212, 0.1);
    color: #0e7490;
    border-color: rgba(6, 182, 212, 0.2);
}

[data-theme="dark"] .alert-success { color: #6ee7b7; }
[data-theme="dark"] .alert-error { color: #fca5a5; }
[data-theme="dark"] .alert-warning { color: #fcd34d; }
[data-theme="dark"] .alert-info { color: #67e8f9; }

/* ==================== MODALS ==================== */
.modal-content {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    box-shadow: var(--shadow-xl);
}

.modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-color);
    gap: 0.75rem;
}

/* ==================== CHARTS ==================== */
.chart-container {
    position: relative;
    height: 300px;
    width: 100%;
}

/* ==================== DROPDOWN ==================== */
.dropdown-menu {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    box-shadow: var(--shadow-lg);
    padding: 0.5rem;
    min-width: 200px;
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.625rem 1rem;
    color: var(--text-primary);
    border-radius: 0.5rem;
    transition: var(--transition);
}

.dropdown-item:hover {
    background: var(--body-bg);
    color: var(--primary);
}

.dropdown-item i {
    width: 20px;
    text-align: center;
    color: var(--text-secondary);
}

.dropdown-item:hover i {
    color: var(--primary);
}

.dropdown-divider {
    border-top: 1px solid var(--border-color);
    margin: 0.5rem 0;
}

/* ==================== UTILITIES ==================== */
.text-muted { color: var(--text-secondary) !important; }
.text-center { text-align: center; }
.text-right { text-align: right; }

.d-flex { display: flex; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 1rem; }

.mb-3 { margin-bottom: 1rem; }
.mb-4 { margin-bottom: 1.5rem; }

.mt-3 { margin-top: 1rem; }
.mt-4 { margin-top: 1.5rem; }

/* ==================== RESPONSIVE ==================== */
@media (max-width: 991.98px) {
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.active {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .header {
        left: 0;
        padding: 0 1rem;
    }
}

@media (max-width: 767.98px) {
    .stat-card-value {
        font-size: 1.5rem;
    }
    
    .main-content {
        padding: 1rem;
    }
    
    .card-body {
        padding: 1rem;
    }
}

/* ==================== PRINT STYLES ==================== */
@media print {
    .sidebar,
    .header,
    .btn,
    .theme-toggle {
        display: none !important;
    }
    
    .main-content {
        margin: 0;
        padding: 0;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid #ddd;
    }
}

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

.card {
    animation: fadeIn 0.3s ease-out;
}

/* ==================== RTL SUPPORT ==================== */
[dir="rtl"] {
    direction: rtl;
    text-align: right;
}

[dir="rtl"] .sidebar {
    left: auto;
    right: 0;
    transform: translateX(100%);
}

[dir="rtl"] .sidebar.active {
    transform: translateX(0);
}

[dir="rtl"] .main-content {
    margin-left: 0;
    margin-right: 280px;
}

[dir="rtl"] .header {
    left: 0;
    right: 280px;
}

[dir="rtl"] .sidebar-menu-link::before {
    left: auto;
    right: 0;
    border-radius: 3px 0 0 3px;
}

@media (max-width: 991.98px) {
    [dir="rtl"] .main-content {
        margin-right: 0;
    }
    
    [dir="rtl"] .header {
        right: 0;
    }
}