:root {
    --bg-body: #f7f9fc;
    --bg-sidebar: #1a1c23;
    --bg-card: #ffffff;
    --bg-header: #ffffff;
    --bg-input: #f7f9fc;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --text-sidebar: #a3aed0;
    --text-sidebar-active: #ffffff;
    --border-color: #e2e8f0;
    --accent: #3b82f6;
    --accent-light: #eff6ff;
    --accent-dark: #1d4ed8;
    --success: #10b981;
    --success-light: #ecfdf5;
    --danger: #ef4444;
    --danger-light: #fef2f2;
    --warning: #f59e0b;
    --warning-light: #fffbeb;
    --info: #06b6d4;
    --info-light: #ecfeff;
    --shadow-sm: 0 1px 2px 0 rgba(0,0,0,0.05);
    --shadow: 0 1px 3px 0 rgba(0,0,0,0.1), 0 1px 2px -1px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
    --radius: 12px;
    --radius-sm: 8px;
    --sidebar-width: 260px;
    --sidebar-collapsed-width: 80px;
    --header-height: 72px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    --bg-body: #1a1c23;
    --bg-sidebar: #111318;
    --bg-card: #232530;
    --bg-header: #232530;
    --bg-input: #2d2f3a;
    --text-primary: #f1f5f9;
    --text-secondary: #a3aed0;
    --text-muted: #64748b;
    --text-sidebar: #a3aed0;
    --text-sidebar-active: #ffffff;
    --border-color: #2d2f3a;
    --accent-light: #1e293b;
    --success-light: #064e3b;
    --danger-light: #450a0a;
    --warning-light: #451a03;
    --info-light: #083344;
    --shadow-sm: 0 1px 2px 0 rgba(0,0,0,0.3);
    --shadow: 0 1px 3px 0 rgba(0,0,0,0.4), 0 1px 2px -1px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.4), 0 2px 4px -2px rgba(0,0,0,0.3);
}

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

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

/* Preloader */
.preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-body);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.5s;
}

.preloader.hidden {
    opacity: 0;
    pointer-events: none;
}

.preloader-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Page Wrapper */
.page-wrapper {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--bg-sidebar);
    z-index: 100;
    overflow-y: auto;
    overflow-x: hidden;
    transition: var(--transition);
}

.sidebar::-webkit-scrollbar {
    width: 4px;
}

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

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}

.sidebar-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: #fff;
}

.sidebar-logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--accent), #8b5cf6);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    color: #fff;
}

.sidebar-logo-text {
    font-size: 22px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.sidebar-close-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-sidebar);
    font-size: 18px;
    cursor: pointer;
    padding: 4px;
}

.sidebar-nav {
    padding: 16px 12px;
}

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

.sidebar-menu-item {
    margin-bottom: 2px;
}

.sidebar-menu-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    color: var(--text-sidebar);
    text-decoration: none;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition);
    cursor: pointer;
}

.sidebar-menu-link:hover {
    color: var(--text-sidebar-active);
    background: rgba(255,255,255,0.08);
}

.sidebar-menu-link.active {
    color: var(--text-sidebar-active);
    background: var(--accent);
}

.sidebar-menu-link i:first-child {
    width: 20px;
    text-align: center;
    font-size: 16px;
}

.sidebar-menu-arrow {
    margin-left: auto;
    font-size: 10px;
    transition: transform 0.3s;
}

.sidebar-menu-link.expanded .sidebar-menu-arrow {
    transform: rotate(90deg);
}

.sidebar-submenu {
    list-style: none;
    padding: 4px 0 4px 48px;
    margin: 0;
    display: none;
    overflow: hidden;
}

.sidebar-submenu.show {
    display: block;
}

.sidebar-submenu li a {
    display: block;
    padding: 8px 16px;
    color: var(--text-sidebar);
    text-decoration: none;
    font-size: 13px;
    font-weight: 400;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.sidebar-submenu li a:hover {
    color: var(--text-sidebar-active);
    background: rgba(255,255,255,0.06);
}

.sidebar-menu-divider {
    height: 1px;
    background: rgba(255,255,255,0.08);
    margin: 12px 16px;
}

/* Main Content */
.main-content {
    margin-left: var(--sidebar-width);
    flex: 1;
    min-height: 100vh;
    transition: var(--transition);
}

/* Header */
.header {
    position: sticky;
    top: 0;
    height: var(--header-height);
    background: var(--bg-header);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 32px;
    z-index: 50;
    transition: var(--transition);
}

.header-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.sidebar-toggle-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 20px;
    cursor: pointer;
    padding: 8px;
    border-radius: var(--radius-sm);
}

.sidebar-toggle-btn:hover {
    background: var(--bg-input);
}

.header-search {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 10px 16px;
    min-width: 280px;
    transition: var(--transition);
}

.header-search:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(59,130,246,0.1);
}

.header-search i {
    color: var(--text-muted);
    font-size: 14px;
}

.header-search input {
    border: none;
    background: none;
    outline: none;
    color: var(--text-primary);
    font-size: 14px;
    width: 100%;
    font-family: inherit;
}

.header-search input::placeholder {
    color: var(--text-muted);
}

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

.header-action {
    position: relative;
}

.theme-toggle,
.notification-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 18px;
    cursor: pointer;
    padding: 10px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    position: relative;
}

.theme-toggle:hover,
.notification-btn:hover {
    background: var(--bg-input);
    color: var(--text-primary);
}

.notification-badge {
    position: absolute;
    top: 4px;
    right: 4px;
    width: 18px;
    height: 18px;
    background: var(--danger);
    color: #fff;
    border-radius: 50%;
    font-size: 10px;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
}

.user-dropdown-wrapper {
    position: relative;
}

.user-dropdown-toggle {
    display: flex;
    align-items: center;
    gap: 10px;
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: 6px 10px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.user-dropdown-toggle:hover {
    background: var(--bg-input);
}

.user-avatar {
    width: 38px;
    height: 38px;
    background: linear-gradient(135deg, var(--accent), #8b5cf6);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 14px;
}

.user-info {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.user-name {
    font-size: 14px;
    font-weight: 600;
    line-height: 1.2;
}

.user-role {
    font-size: 12px;
    color: var(--text-muted);
    line-height: 1.2;
}

.user-dropdown-toggle > .fa-chevron-down {
    font-size: 10px;
    color: var(--text-muted);
}

.user-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 200px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    display: none;
    overflow: hidden;
    z-index: 200;
}

.user-dropdown.show {
    display: block;
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 16px;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 14px;
    transition: var(--transition);
    border: none;
    background: none;
    width: 100%;
    text-align: left;
    cursor: pointer;
}

.dropdown-item:hover {
    background: var(--bg-input);
}

.dropdown-item i {
    width: 16px;
    color: var(--text-secondary);
}

.dropdown-divider {
    height: 1px;
    background: var(--border-color);
    margin: 4px 0;
}

.text-danger {
    color: var(--danger) !important;
}

/* Content Area */
.content {
    padding: 32px;
}

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

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

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

.card-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.card-body {
    padding: 24px;
}

/* KPI Cards */
.kpi-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-bottom: 24px;
}

.kpi-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.kpi-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

.kpi-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
}

.kpi-icon.blue {
    background: var(--accent-light);
    color: var(--accent);
}

.kpi-icon.green {
    background: var(--success-light);
    color: var(--success);
}

.kpi-icon.red {
    background: var(--danger-light);
    color: var(--danger);
}

.kpi-icon.yellow {
    background: var(--warning-light);
    color: var(--warning);
}

.kpi-icon.cyan {
    background: var(--info-light);
    color: var(--info);
}

.kpi-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
}

.kpi-label {
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: 4px;
}

.kpi-trend {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 12px;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: 20px;
    margin-top: 8px;
}

.kpi-trend.up {
    color: var(--success);
    background: var(--success-light);
}

.kpi-trend.down {
    color: var(--danger);
    background: var(--danger-light);
}

/* Charts Grid */
.charts-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 24px;
    margin-bottom: 24px;
}

.chart-container {
    position: relative;
    height: 300px;
}

/* Tables */
.table-wrapper {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

table th {
    background: var(--bg-input);
    padding: 12px 16px;
    text-align: left;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 1px solid var(--border-color);
}

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

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

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

.badge-success {
    background: var(--success-light);
    color: var(--success);
}

.badge-warning {
    background: var(--warning-light);
    color: var(--warning);
}

.badge-danger {
    background: var(--danger-light);
    color: var(--danger);
}

.badge-info {
    background: var(--info-light);
    color: var(--info);
}

.badge-accent {
    background: var(--accent-light);
    color: var(--accent);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    border: 1px solid transparent;
    transition: var(--transition);
    text-decoration: none;
}

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

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

.btn-outline {
    background: transparent;
    border-color: var(--border-color);
    color: var(--text-primary);
}

.btn-outline:hover {
    background: var(--bg-input);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 12px;
}

/* Quick Actions */
.quick-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 24px;
}

.quick-action-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    text-decoration: none;
    font-size: 13px;
    font-weight: 500;
    transition: var(--transition);
}

.quick-action-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
    box-shadow: var(--shadow);
}

.quick-action-btn i {
    font-size: 14px;
    color: var(--accent);
}

/* Page Header */
.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
}

.page-title {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
}

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

/* Responsive */
@media (max-width: 1024px) {
    .kpi-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .charts-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }

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

    .sidebar-close-btn {
        display: block;
    }

    .main-content {
        margin-left: 0;
    }

    .sidebar-toggle-btn {
        display: block;
    }

    .header-search {
        display: none;
    }

    .user-info {
        display: none;
    }

    .content {
        padding: 16px;
    }

    .kpi-grid {
        grid-template-columns: 1fr;
    }

    .page-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }
}

/* Sidebar overlay on mobile */
.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 99;
}

.sidebar-overlay.show {
    display: block;
}