/* Modern Admin Panel Design System - Minimal & Clean */

:root {
    /* Layout */
    --sidebar-width: 280px;
    --navbar-height: 70px;
    --navbar-height-mobile: 60px;
    --navbar-height-tablet: 65px;
    
    /* Colors - Minimal Palette */
    --primary: #1f2937;
    --primary-dark: #111827;
    --primary-light: #374151;
    --secondary: #6b7280;
    --success: #059669;
    --warning: #d97706;
    --danger: #dc2626;
    --info: #0891b2;
    
    /* Grays - Simplified */
    --gray-50: #fafafa;
    --gray-100: #f5f5f5;
    --gray-200: #e5e5e5;
    --gray-300: #d4d4d4;
    --gray-400: #a3a3a3;
    --gray-500: #737373;
    --gray-600: #525252;
    --gray-700: #404040;
    --gray-800: #262626;
    --gray-900: #171717;
    
    /* Surfaces - Clean */
    --surface-primary: #ffffff;
    --surface-secondary: #fafafa;
    --surface-tertiary: #f5f5f5;
    
    /* Borders - Subtle */
    --border-light: #e5e5e5;
    --border-medium: #d4d4d4;
    --border-dark: #a3a3a3;
    
    /* Shadows - Minimal */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.03);
    --shadow-md: 0 2px 4px 0 rgb(0 0 0 / 0.06);
    --shadow-lg: 0 4px 8px 0 rgb(0 0 0 / 0.08);
    --shadow-xl: 0 8px 16px 0 rgb(0 0 0 / 0.1);
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;
    --radius-2xl: 1rem;
    
    /* Typography */
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    --transition-slow: 500ms ease;
    
    /* Z-index */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
    
    /* Mobile-specific variables */
    --touch-target-size: 44px;
    --mobile-padding: var(--space-4);
    --tablet-padding: var(--space-5);
}

/* Reset and Base Styles */
* {
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: #ffffff;
    margin: 0;
    padding: 0;
    line-height: 1.5;
    color: var(--gray-800);
    font-size: var(--font-size-base);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

/* Device type classes */
.is-mobile {
    --navbar-height: var(--navbar-height-mobile);
    --sidebar-width: 100%;
}

.is-tablet {
    --navbar-height: var(--navbar-height-tablet);
}

/* Touch feedback */
.touch-active {
    background-color: var(--surface-tertiary) !important;
    transform: scale(0.98);
    transition: all 0.1s ease;
}

.touch-feedback {
    background: var(--surface-tertiary) !important;
}

/* Modern Navbar */
.modern-navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--navbar-height);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-light);
    z-index: var(--z-sticky);
    transition: height var(--transition-fast);
}

.navbar-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    padding: 0 var(--space-6);
    max-width: 100%;
}

/* Navbar Left */
.navbar-left {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    flex: 1;
    min-width: 0;
}

.sidebar-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: var(--touch-target-size);
    height: var(--touch-target-size);
    background: none;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    gap: 3px;
    transition: var(--transition-fast);
    -webkit-tap-highlight-color: transparent;
}

.sidebar-toggle:hover,
.sidebar-toggle:focus {
    background-color: var(--surface-tertiary);
    outline: none;
}

.sidebar-toggle:active {
    transform: scale(0.95);
}

.hamburger-line {
    width: 18px;
    height: 2px;
    background-color: var(--gray-600);
    border-radius: 1px;
    transition: var(--transition-fast);
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.brand-icon {
    width: 40px;
    height: 40px;
    background: var(--primary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: var(--font-size-lg);
    flex-shrink: 0;
}

.brand-text h1 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--gray-900);
    margin: 0;
    line-height: 1.2;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.brand-text-mobile h1 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--gray-900);
    margin: 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.breadcrumb-text {
    font-size: var(--font-size-sm);
    color: var(--gray-500);
    font-weight: 400;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Navbar Center - Search */
.navbar-center {
    flex: 1;
    max-width: 400px;
    margin: 0 var(--space-4);
}

.search-container {
    position: relative;
    width: 100%;
}

.search-box {
    position: relative;
    display: flex;
    align-items: center;
    background: var(--surface-primary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: var(--space-2) var(--space-3);
    transition: var(--transition-fast);
    height: 36px;
}

.search-box:focus-within,
.search-box.mobile-focused {
    border-color: var(--gray-400);
    box-shadow: 0 0 0 2px rgb(163 163 163 / 0.1);
}

.search-icon {
    color: var(--gray-400);
    font-size: var(--font-size-base);
    margin-right: var(--space-2);
    flex-shrink: 0;
}

.search-input {
    flex: 1;
    border: none;
    outline: none;
    font-size: var(--font-size-sm);
    color: var(--gray-700);
    background: transparent;
    min-width: 0;
}

.search-input::placeholder {
    color: var(--gray-400);
}

.search-shortcut {
    display: flex;
    gap: var(--space-1);
    margin-left: var(--space-2);
    flex-shrink: 0;
}

.search-shortcut kbd {
    background: var(--surface-tertiary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-sm);
    padding: 2px var(--space-1);
    font-size: 10px;
    color: var(--gray-500);
    font-family: inherit;
    line-height: 1;
}

/* Navbar Right */
.navbar-right {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    flex: 1;
    justify-content: flex-end;
}

/* Quick Actions */
.quick-actions {
    display: flex;
    gap: var(--space-2);
}

.action-btn {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
    text-decoration: none;
    min-height: var(--touch-target-size);
    -webkit-tap-highlight-color: transparent;
}

.action-btn:hover,
.action-btn:focus {
    background: var(--primary-dark);
    color: white;
    outline: none;
}

.action-btn:active {
    transform: translateY(0);
}

/* Notification Center */
.notification-center {
    display: flex;
    gap: var(--space-2);
}

.notification-item {
    position: relative;
    width: var(--touch-target-size);
    height: var(--touch-target-size);
    background: var(--surface-primary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition-fast);
    color: var(--gray-600);
    font-size: var(--font-size-lg);
    -webkit-tap-highlight-color: transparent;
}

.notification-item:hover,
.notification-item:focus {
    background: var(--surface-tertiary);
    color: var(--gray-800);
    outline: none;
}

.notification-item:active {
    transform: translateY(0);
}

.notification-badge {
    position: absolute;
    top: -4px;
    right: -4px;
    background: var(--gray-800);
    color: white;
    font-size: var(--font-size-xs);
    font-weight: 500;
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-lg);
    min-width: 16px;
    height: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid white;
    line-height: 1;
}

.messages-badge {
    background: var(--gray-700);
}

/* User Profile */
.user-profile {
    position: relative;
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: var(--transition-fast);
    border: 1px solid transparent;
    min-height: var(--touch-target-size);
    -webkit-tap-highlight-color: transparent;
}

.user-profile:hover,
.user-profile:focus {
    background-color: var(--surface-tertiary);
    outline: none;
}

.user-avatar {
    position: relative;
    width: 36px;
    height: 36px;
    flex-shrink: 0;
}

.user-avatar img {
    width: 100%;
    height: 100%;
    border-radius: var(--radius-lg);
    object-fit: cover;
    border: 1px solid var(--border-light);
}

.status-indicator {
    position: absolute;
    bottom: -2px;
    right: -2px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    border: 2px solid white;
}

.status-indicator.online {
    background-color: var(--success);
}

.status-indicator.away {
    background-color: var(--warning);
}

.status-indicator.offline {
    background-color: var(--gray-400);
}

.user-info {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    min-width: 0;
}

.user-name {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--gray-900);
    line-height: 1.2;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 120px;
}

.user-role {
    font-size: var(--font-size-xs);
    color: var(--gray-500);
    line-height: 1.2;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 120px;
}

.dropdown-arrow {
    color: var(--gray-400);
    font-size: var(--font-size-sm);
    transition: var(--transition-fast);
    flex-shrink: 0;
}

.user-profile[aria-expanded="true"] .dropdown-arrow {
    transform: rotate(180deg);
}

/* Navbar Tools */
.navbar-tools {
    display: flex;
    gap: var(--space-2);
}

.tool-btn {
    width: var(--touch-target-size);
    height: var(--touch-target-size);
    background: var(--surface-primary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition-fast);
    color: var(--gray-600);
    font-size: var(--font-size-base);
    -webkit-tap-highlight-color: transparent;
}

.tool-btn:hover,
.tool-btn:focus {
    background: var(--surface-tertiary);
    color: var(--gray-800);
    outline: none;
}

.tool-btn:active {
    transform: translateY(0);
}

/* Modern Sidebar */
.modern-sidebar {
    position: fixed;
    top: var(--navbar-height);
    left: 0;
    height: calc(100vh - var(--navbar-height));
    width: var(--sidebar-width);
    background: var(--surface-primary);
    border-right: 1px solid var(--border-light);
    z-index: var(--z-fixed);
    display: flex;
    flex-direction: column;
    transition: transform var(--transition-normal) ease;
    transform: translateX(0);
}

.modern-sidebar.collapsed {
    transform: translateX(-100%);
}

/* Sidebar Header */
.sidebar-header {
    padding: var(--space-6);
    border-bottom: 1px solid var(--border-light);
    background: var(--surface-primary);
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 80px;
    flex-shrink: 0;
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    min-width: 0;
    flex: 1;
}

.sidebar-brand .brand-icon {
    width: 48px;
    height: 48px;
    background: var(--primary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: var(--font-size-xl);
    flex-shrink: 0;
}

.brand-content {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.brand-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--gray-900);
    line-height: 1.2;
    margin: 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.brand-subtitle {
    font-size: var(--font-size-xs);
    color: var(--gray-500);
    font-weight: 400;
    margin-top: var(--space-1);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sidebar-close-btn {
    width: 32px;
    height: 32px;
    background: var(--surface-tertiary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gray-500);
    cursor: pointer;
    transition: var(--transition-fast);
    flex-shrink: 0;
    -webkit-tap-highlight-color: transparent;
}

.sidebar-close-btn:hover,
.sidebar-close-btn:focus {
    background: var(--border-light);
    color: var(--gray-700);
    outline: none;
}

.sidebar-close-btn:active {
    transform: scale(0.95);
}

/* Sidebar Content */
.sidebar-content {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: var(--space-4) 0;
    -webkit-overflow-scrolling: touch;
}

.sidebar-nav {
    padding: 0;
}

/* Navigation Sections */
.nav-section {
    margin-bottom: var(--space-8);
}

.nav-section-header {
    padding: 0 var(--space-6) var(--space-3) var(--space-6);
    border-bottom: 1px solid var(--border-light);
    margin-bottom: var(--space-4);
}

.nav-section-title {
    font-size: var(--font-size-xs);
    font-weight: 600;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin: 0;
}

/* Navigation Menu */
.nav-menu {
    list-style: none;
    padding: 0;
    margin: 0;
}

.nav-item {
    margin-bottom: var(--space-1);
}

.nav-link {
    display: flex;
    align-items: center;
    padding: var(--space-3) var(--space-6);
    color: var(--gray-600);
    text-decoration: none;
    font-weight: 400;
    font-size: var(--font-size-sm);
    position: relative;
    border: none;
    background: none;
    width: 100%;
    transition: var(--transition-fast);
    min-height: var(--touch-target-size);
    -webkit-tap-highlight-color: transparent;
    cursor: pointer;
}

.nav-link:hover,
.nav-link:focus {
    background: var(--surface-tertiary);
    color: var(--gray-900);
    text-decoration: none;
    outline: none;
}

.nav-link:active {
    background: var(--surface-tertiary);
}

.nav-link.active {
    background: var(--surface-tertiary);
    color: var(--gray-900);
    font-weight: 500;
}

.nav-link.active .nav-indicator {
    opacity: 1;
    transform: scaleY(1);
}

.nav-icon {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: var(--space-3);
    font-size: var(--font-size-base);
    flex-shrink: 0;
}

.nav-text {
    flex: 1;
    min-width: 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.nav-arrow {
    width: 16px;
    height: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-left: auto;
    transition: var(--transition-fast);
    font-size: var(--font-size-sm);
    flex-shrink: 0;
}

.nav-link[aria-expanded="true"] .nav-arrow {
    transform: rotate(180deg);
}

.nav-indicator {
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%) scaleY(0);
    width: 3px;
    height: 24px;
    background: var(--gray-800);
    border-radius: 0 2px 2px 0;
    opacity: 0;
    transition: var(--transition-fast);
}

/* Submenu Styles */
.submenu {
    list-style: none;
    padding: var(--space-2) 0;
    margin: 0;
    background: var(--surface-primary);
    border-left: 2px solid var(--border-light);
    margin-left: var(--space-6);
    border-radius: 0 0 var(--radius-lg) 0;
}

/* Bootstrap Collapse Integration */
.collapse {
    transition: height var(--transition-normal) ease;
}

.collapse:not(.show) {
    display: none;
}

.collapse.show {
    display: block;
}

.collapsing {
    height: 0;
    overflow: hidden;
    transition: height var(--transition-normal) ease;
}

.submenu-item {
    margin-bottom: var(--space-1);
}

.submenu-link {
    display: flex;
    align-items: center;
    padding: var(--space-3) var(--space-6) var(--space-3) var(--space-8);
    color: var(--gray-500);
    text-decoration: none;
    font-size: var(--font-size-sm);
    font-weight: 400;
    position: relative;
    transition: var(--transition-fast);
    border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
    margin-right: var(--space-4);
    min-height: var(--touch-target-size);
    -webkit-tap-highlight-color: transparent;
}

.submenu-link:hover,
.submenu-link:focus {
    background: var(--surface-tertiary);
    color: var(--gray-900);
    text-decoration: none;
    outline: none;
}

.submenu-link:active {
    background: var(--surface-tertiary);
}

.submenu-divider {
    height: 1px;
    background: var(--border-light);
    margin: var(--space-3) var(--space-4);
    border: none;
    opacity: 0.6;
}

.submenu-header {
    padding: var(--space-3) var(--space-6) var(--space-2) var(--space-8);
    font-size: var(--font-size-xs);
    font-weight: 600;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 0.8px;
    margin-top: var(--space-2);
    margin-bottom: var(--space-1);
    position: relative;
}

.submenu-header::before {
    content: '';
    position: absolute;
    left: var(--space-6);
    top: 50%;
    transform: translateY(-50%);
    width: 12px;
    height: 2px;
    background: var(--gray-400);
    border-radius: 1px;
}

.submenu-link.active {
    background: var(--surface-tertiary);
    color: var(--gray-900);
    font-weight: 500;
    border-left: 3px solid var(--gray-800);
    padding-left: calc(var(--space-8) - 3px);
}

.submenu-icon {
    width: 16px;
    height: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: var(--space-3);
    font-size: var(--font-size-sm);
    flex-shrink: 0;
    opacity: 0.7;
}

.submenu-link:hover .submenu-icon,
.submenu-link.active .submenu-icon {
    opacity: 1;
}

/* Sidebar Footer */
.sidebar-footer {
    margin-top: auto;
    border-top: 1px solid var(--border-light);
    background: var(--surface-primary);
    padding: var(--space-4);
    flex-shrink: 0;
    position: relative;
    z-index: var(--z-popover);
}

.sidebar-user {
    background: var(--surface-primary);
    border-radius: var(--radius-xl);
    padding: var(--space-4);
    border: 1px solid var(--border-light);
}

.user-profile {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.user-avatar {
    position: relative;
    flex-shrink: 0;
}

.user-avatar img {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-xl);
    object-fit: cover;
    border: 1px solid var(--border-light);
}

.user-details {
    flex: 1;
    min-width: 0;
}

.user-name {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--gray-900);
    margin-bottom: var(--space-1);
    line-height: 1.2;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.user-status {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.status-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    flex-shrink: 0;
}

.status-dot.online {
    background-color: var(--success);
}

.status-dot.away {
    background-color: var(--warning);
}

.status-dot.offline {
    background-color: var(--gray-400);
}

.status-text {
    font-size: var(--font-size-xs);
    color: var(--gray-500);
    font-weight: 400;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.user-actions {
    flex-shrink: 0;
}

.user-menu-btn {
    width: 32px;
    height: 32px;
    background: var(--surface-tertiary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gray-500);
    cursor: pointer;
    transition: var(--transition-fast);
    font-size: var(--font-size-sm);
    -webkit-tap-highlight-color: transparent;
}

.user-menu-btn:hover,
.user-menu-btn:focus {
    background: var(--border-light);
    color: var(--gray-700);
    outline: none;
}

.user-menu-btn:active {
    transform: scale(0.95);
}

/* Main Content */
.main-content {
    margin-left: var(--sidebar-width);
    margin-top: var(--navbar-height);
    min-height: calc(100vh - var(--navbar-height));
    display: flex;
    flex-direction: column;
    transition: margin-left var(--transition-normal) ease;
}

.content-wrapper {
    flex-grow: 1;
    padding: var(--space-6);
}

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

/* Bottom Sheet for Mobile Dropdowns */
.bottom-sheet {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--surface-primary);
    border-radius: var(--radius-2xl) var(--radius-2xl) 0 0;
    box-shadow: var(--shadow-xl);
    z-index: var(--z-modal);
    transform: translateY(100%);
    max-height: 80vh;
    overflow-y: auto;
    transition: transform var(--transition-normal) ease;
    -webkit-overflow-scrolling: touch;
}

.bottom-sheet.show {
    transform: translateY(0);
}

.bottom-sheet-header {
    padding: var(--space-4) var(--space-6);
    border-bottom: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    background: var(--surface-primary);
    z-index: 1;
    position: relative;
}

.bottom-sheet-header::before {
    content: '';
    position: absolute;
    top: var(--space-2);
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 4px;
    background: var(--gray-300);
    border-radius: 2px;
}

.bottom-sheet-title {
    font-size: var(--font-size-lg);
    font-weight: 500;
    color: var(--gray-900);
    margin: 0;
}

.bottom-sheet-close {
    width: 32px;
    height: 32px;
    background: var(--surface-tertiary);
    border: none;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gray-500);
    cursor: pointer;
    transition: var(--transition-fast);
    -webkit-tap-highlight-color: transparent;
}

.bottom-sheet-close:hover,
.bottom-sheet-close:focus {
    background: var(--border-light);
    color: var(--gray-700);
    outline: none;
}

.bottom-sheet-close:active {
    transform: scale(0.95);
}

.bottom-sheet-content {
    padding: var(--space-4) var(--space-6);
}

/* Backdrop */
.backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.3);
    z-index: var(--z-modal-backdrop);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal) ease;
    -webkit-tap-highlight-color: transparent;
}

.backdrop.show {
    opacity: 1;
    visibility: visible;
}

/* Modern Dropdown Styles */
.dropdown-menu {
    border: none;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    padding: var(--space-4);
    margin-top: var(--space-2);
    min-width: 280px;
    position: absolute;
    top: 100%;
    right: 0;
    left: auto;
    z-index: var(--z-dropdown);
    background: var(--surface-primary);
    transition: all 0.2s ease;
    border: 1px solid var(--border-light);
}

/* Desktop dropdown positioning */
@media (min-width: 769px) {
    .dropdown-menu {
        position: fixed;
        display: block;
        opacity: 1;
        transform: translateY(0);
    }
    
    .dropdown-menu.show {
        opacity: 1;
        transform: translateY(0);
    }
}

.dropdown-header {
    padding: 0 0 var(--space-4) 0;
    border-bottom: 1px solid var(--border-light);
    margin-bottom: var(--space-4);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-content h6 {
    margin: 0;
    font-size: var(--font-size-lg);
    font-weight: 500;
    color: var(--gray-900);
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3);
    border-radius: var(--radius-lg);
    border: none;
    color: var(--gray-600);
    text-decoration: none;
    font-size: var(--font-size-sm);
    font-weight: 400;
    width: 100%;
    text-align: left;
    background: none;
    cursor: pointer;
    transition: var(--transition-fast);
    min-height: var(--touch-target-size);
    -webkit-tap-highlight-color: transparent;
}

.dropdown-item:hover,
.dropdown-item:focus {
    background-color: var(--surface-tertiary);
    color: var(--gray-800);
    text-decoration: none;
    outline: none;
}

.dropdown-item:active {
    background-color: var(--border-light);
}

.dropdown-item i {
    width: 18px;
    text-align: center;
    font-size: var(--font-size-base);
    flex-shrink: 0;
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    top: var(--space-4);
    right: var(--space-4);
    z-index: var(--z-tooltip);
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    pointer-events: none;
    max-width: 400px;
}

.toast-notification {
    background: var(--surface-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: var(--space-4);
    display: flex;
    align-items: center;
    gap: var(--space-3);
    border: 1px solid var(--border-light);
    pointer-events: auto;
    transform: translateX(100%);
    opacity: 0;
    transition: all var(--transition-normal) ease;
    position: relative;
    overflow: hidden;
}

.toast-notification.show {
    transform: translateX(0);
    opacity: 1;
}

.toast-notification.removing {
    transform: translateX(100%);
    opacity: 0;
}

.toast-icon {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-md);
    background: var(--gray-800);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-base);
    flex-shrink: 0;
}

.toast-content {
    flex: 1;
    min-width: 0;
}

.toast-title {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--gray-900);
    margin-bottom: var(--space-1);
    line-height: 1.3;
}

.toast-message {
    font-size: var(--font-size-sm);
    color: var(--gray-600);
    line-height: 1.4;
}

.toast-close {
    width: 24px;
    height: 24px;
    background: none;
    border: none;
    color: var(--gray-400);
    cursor: pointer;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
    flex-shrink: 0;
    -webkit-tap-highlight-color: transparent;
}

.toast-close:hover,
.toast-close:focus {
    background: var(--surface-tertiary);
    color: var(--gray-600);
    outline: none;
}

.toast-close:active {
    transform: scale(0.95);
}

/* Mobile Responsive */
@media (max-width: 1024px) {
    .is-tablet .navbar-container {
        padding: 0 var(--tablet-padding);
    }
    
    .is-tablet .content-wrapper {
        padding: var(--tablet-padding);
    }
}

@media (max-width: 768px) {
    :root {
        --navbar-height: var(--navbar-height-mobile);
        --sidebar-width: 100%;
    }
    
    .toast-container {
        top: var(--space-3);
        right: var(--space-3);
        left: var(--space-3);
        max-width: none;
    }
    
    .toast-notification {
        max-width: none;
        padding: var(--space-3);
    }
    
    .modern-navbar {
        height: var(--navbar-height-mobile);
    }
    
    .navbar-container {
        padding: 0 var(--mobile-padding);
    }
    
    .navbar-left {
        gap: var(--space-2);
    }
    
    .sidebar-toggle {
        width: 40px;
        height: 40px;
    }
    
    .hamburger-line {
        width: 16px;
    }
    
    .brand-icon {
        width: 36px;
        height: 36px;
        font-size: var(--font-size-base);
    }
    
    .brand-text-mobile h1 {
        font-size: var(--font-size-base);
    }
    
    .navbar-center {
        display: none !important;
    }
    
    .navbar-right {
        gap: var(--space-2);
    }
    
    .notification-item {
        width: 40px;
        height: 40px;
        font-size: var(--font-size-base);
    }
    
    .notification-badge {
        top: -4px;
        right: -4px;
        font-size: 10px;
        min-width: 16px;
        height: 16px;
        padding: 0 var(--space-1);
    }
    
    .user-avatar {
        width: 32px;
        height: 32px;
    }
    
    .user-info {
        display: none;
    }
    
    .dropdown-arrow {
        display: none;
    }
    
    .navbar-tools {
        display: none !important;
    }
    
    .quick-actions {
        display: none !important;
    }
    
    /* Mobile Sidebar */
    .modern-sidebar {
        top: 0;
        height: 100vh;
        transform: translateX(-100%);
        z-index: var(--z-modal);
    }
    
    .modern-sidebar.show {
        transform: translateX(0);
    }
    
    .sidebar-header {
        padding: var(--mobile-padding);
        min-height: var(--navbar-height-mobile);
    }
    
    .sidebar-brand .brand-icon {
        width: 40px;
        height: 40px;
        font-size: var(--font-size-lg);
    }
    
    .brand-title {
        font-size: var(--font-size-lg);
    }
    
    .brand-subtitle {
        font-size: 11px;
    }
    
    .sidebar-close-btn {
        width: 28px;
        height: 28px;
        font-size: var(--font-size-sm);
    }
    
    .nav-section-header {
        padding: 0 var(--mobile-padding) var(--space-2) var(--mobile-padding);
    }
    
    .nav-link {
        padding: var(--space-3) var(--mobile-padding);
        min-height: 48px;
    }
    
    .submenu {
        margin-left: var(--mobile-padding);
        border-radius: 0 0 var(--radius-md) 0;
    }
    
    .submenu-link {
        padding: var(--space-3) var(--mobile-padding) var(--space-3) calc(var(--mobile-padding) + var(--space-4));
        margin-right: var(--space-2);
        border-radius: 0 var(--radius-md) var(--radius-md) 0;
        min-height: 48px;
    }
    
    .sidebar-footer {
        padding: var(--space-3);
    }
    
    .sidebar-user {
        padding: var(--space-3);
    }
    
    .user-avatar img {
        width: 36px;
        height: 36px;
    }
    
    .user-menu-btn {
        width: 28px;
        height: 28px;
        font-size: var(--font-size-sm);
    }
    
    .main-content {
        margin-left: 0;
        margin-top: var(--navbar-height-mobile);
    }
    
    .content-wrapper {
        padding: var(--mobile-padding);
    }
    
    /* Mobile Dropdowns use Bottom Sheet */
    .dropdown-menu {
        display: none !important;
    }
    
    /* Ensure Bootstrap dropdowns don't interfere */
    .dropdown-menu.show {
        display: none !important;
    }
    
    /* Mobile-specific touch improvements */
    .nav-link,
    .submenu-link,
    .dropdown-item,
    .notification-item,
    .user-profile,
    .tool-btn,
    .action-btn {
        -webkit-tap-highlight-color: transparent;
        touch-action: manipulation;
    }
}

@media (max-width: 576px) {
    .navbar-container {
        padding: 0 var(--space-3);
    }
    
    .navbar-left {
        gap: var(--space-1);
    }
    
    .sidebar-toggle {
        width: 36px;
        height: 36px;
    }
    
    .hamburger-line {
        width: 14px;
    }
    
    .brand-icon {
        width: 32px;
        height: 32px;
        font-size: var(--font-size-sm);
    }
    
    .brand-text-mobile h1 {
        font-size: var(--font-size-sm);
    }
    
    .notification-item {
        width: 36px;
        height: 36px;
        font-size: var(--font-size-sm);
    }
    
    .user-avatar {
        width: 28px;
        height: 28px;
    }
    
    .content-wrapper {
        padding: var(--space-3);
    }
    
    .toast-notification {
        padding: var(--space-3);
        gap: var(--space-2);
    }
    
    .toast-icon {
        width: 28px;
        height: 28px;
        font-size: var(--font-size-sm);
    }
    
    .toast-title {
        font-size: var(--font-size-xs);
    }
    
    .toast-message {
        font-size: var(--font-size-xs);
    }
}

/* Utility Classes */
.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;
}

/* Scrollbar Styling */
.sidebar-content::-webkit-scrollbar {
    width: 6px;
}

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

.sidebar-content::-webkit-scrollbar-thumb {
    background: var(--border-medium);
    border-radius: 3px;
}

.sidebar-content::-webkit-scrollbar-thumb:hover {
    background: var(--border-dark);
}

/* Animation Classes */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from { transform: translateY(20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.animate-fade-in {
    animation: fadeIn var(--transition-normal);
}

.animate-slide-up {
    animation: slideUp var(--transition-normal);
}

/* Performance optimizations */
.animations-paused * {
    animation-play-state: paused !important;
    transition: none !important;
}

/* Focus Styles */
.focus-visible {
    outline: 1px solid var(--primary);
    outline-offset: 1px;
}

/* Custom focus styles for form elements */
.form-control:focus,
.form-select:focus,
.form-check-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(31, 41, 55, 0.1);
    outline: none;
}

/* Button focus styles */
.btn:focus,
.btn:focus-visible {
    box-shadow: 0 0 0 2px rgba(31, 41, 55, 0.2);
    outline: none;
}

/* Navigation focus styles */
.nav-link:focus,
.submenu-link:focus {
    outline: 1px solid var(--primary);
    outline-offset: -1px;
}

/* Dropdown item focus */
.dropdown-item:focus {
    outline: 1px solid var(--primary);
    outline-offset: -1px;
}

/* Sidebar Dropdown Styles */
.sidebar-footer .dropdown-menu {
    position: absolute;
    bottom: 100%;
    right: 0;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-xl);
    padding: var(--space-2);
    margin-bottom: var(--space-2);
    min-width: 200px;
    background: var(--surface-primary);
    z-index: var(--z-tooltip);
    display: none;
}

.sidebar-footer .dropdown-menu.show {
    display: block;
}

.sidebar-footer .dropdown-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-sm);
    font-weight: 400;
    color: var(--gray-600);
    text-decoration: none;
    border: none;
    background: none;
    width: 100%;
    text-align: left;
    cursor: pointer;
    min-height: var(--touch-target-size);
    -webkit-tap-highlight-color: transparent;
}

.sidebar-footer .dropdown-item:hover,
.sidebar-footer .dropdown-item:focus {
    background-color: var(--surface-tertiary);
    color: var(--gray-800);
    outline: none;
}

.sidebar-footer .dropdown-item.text-danger {
    color: var(--danger);
}

.sidebar-footer .dropdown-item.text-danger:hover,
.sidebar-footer .dropdown-item.text-danger:focus {
    background-color: rgba(220, 38, 38, 0.1);
    color: var(--danger) !important;
}

.sidebar-footer .dropdown-item i {
    width: 16px;
    text-align: center;
    font-size: var(--font-size-sm);
    flex-shrink: 0;
}

.sidebar-footer .dropdown-divider {
    margin: var(--space-2) 0;
    border-color: var(--border-light);
}

/* JavaScript Error Fallback */
.js-error .toast-notification {
    display: none !important;
}

.js-error .notification-badge {
    display: none !important;
}

.js-error .dropdown-menu {
    display: none !important;
}

.js-error .bottom-sheet {
    display: none !important;
}

/* Dark theme support */
[data-theme="dark"] {
    --surface-primary: var(--gray-800);
    --surface-secondary: var(--gray-900);
    --surface-tertiary: var(--gray-700);
    --border-light: var(--gray-700);
    --border-medium: var(--gray-600);
    --border-dark: var(--gray-500);
}

[data-theme="dark"] .modern-navbar {
    background: rgba(38, 38, 38, 0.95);
}

[data-theme="dark"] .modern-sidebar {
    background: var(--gray-800);
    border-color: var(--gray-700);
}

[data-theme="dark"] .toast-notification {
    background: var(--gray-800);
    color: var(--gray-100);
}

[data-theme="dark"] .dropdown-menu {
    background: var(--gray-800);
}

[data-theme="dark"] .bottom-sheet {
    background: var(--gray-800);
}

/* Print Styles */
@media print {
    .modern-navbar,
    .modern-sidebar,
    .toast-container,
    .bottom-sheet,
    .backdrop {
        display: none !important;
    }
    
    .main-content {
        margin: 0 !important;
    }
    
    .content-wrapper {
        padding: 0 !important;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Notification Styles */
.notification-badge.pulse-animation {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.1);
    }
    100% {
        transform: scale(1);
    }
}

.notification-item.unread {
    background-color: var(--surface-secondary);
    border-left: 3px solid var(--primary);
}

.notification-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: var(--font-size-base);
    flex-shrink: 0;
}

.notification-content {
    flex: 1;
    min-width: 0;
}

.notification-title {
    font-weight: 600;
    margin-bottom: var(--space-1);
    color: var(--gray-900);
    font-size: var(--font-size-sm);
    line-height: 1.3;
}

.notification-message {
    color: var(--gray-600);
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-2);
    line-height: 1.4;
}

.notification-meta {
    display: flex;
    gap: var(--space-2);
    font-size: var(--font-size-xs);
    color: var(--gray-500);
}

.notification-time {
    font-weight: 500;
}

.notification-category {
    padding: var(--space-1) var(--space-2);
    background: var(--surface-tertiary);
    border-radius: var(--radius-sm);
    font-weight: 500;
}

.unread-indicator {
    width: 8px;
    height: 8px;
    background: var(--primary);
    border-radius: 50%;
    margin-left: var(--space-2);
    flex-shrink: 0;
}

.notification-actions {
    display: flex;
    gap: var(--space-1);
    margin-left: var(--space-2);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.notification-item:hover .notification-actions {
    opacity: 1;
}

.notification-actions .btn-link {
    width: 24px;
    height: 24px;
    background: none;
    border: none;
    color: var(--gray-400);
    cursor: pointer;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
    font-size: var(--font-size-sm);
    -webkit-tap-highlight-color: transparent;
}

.notification-actions .btn-link:hover,
.notification-actions .btn-link:focus {
    background: var(--surface-tertiary);
    color: var(--gray-600);
    outline: none;
}

.header-actions {
    display: flex;
    gap: var(--space-1);
    margin-left: var(--space-2);
}

.header-actions .btn-link {
    width: 28px;
    height: 28px;
    background: none;
    border: none;
    color: var(--gray-400);
    cursor: pointer;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
    font-size: var(--font-size-sm);
    -webkit-tap-highlight-color: transparent;
}

.header-actions .btn-link:hover,
.header-actions .btn-link:focus {
    background: var(--surface-tertiary);
    color: var(--gray-600);
    outline: none;
}

.no-notifications {
    text-align: center;
    padding: var(--space-8);
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
}

.empty-state i {
    font-size: var(--font-size-3xl);
    color: var(--gray-400);
    margin-bottom: var(--space-2);
}

.empty-title {
    font-weight: 600;
    color: var(--gray-700);
    font-size: var(--font-size-base);
}

.empty-message {
    color: var(--gray-500);
    font-size: var(--font-size-sm);
}

.dropdown-footer {
    padding-top: var(--space-2);
    border-top: 1px solid var(--border-light);
    margin-top: var(--space-2);
}

.mobile-actions {
    padding: var(--space-4);
    display: flex;
    gap: var(--space-3);
    border-top: 1px solid var(--border-light);
    margin-top: var(--space-4);
}

.mobile-actions .btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: var(--transition-fast);
    -webkit-tap-highlight-color: transparent;
}

.mobile-actions .btn-outline-primary {
    background: transparent;
    border: 1px solid var(--primary);
    color: var(--primary);
}

.mobile-actions .btn-outline-primary:hover,
.mobile-actions .btn-outline-primary:focus {
    background: var(--primary);
    color: white;
    outline: none;
}

.mobile-actions .btn-primary {
    background: var(--primary);
    border: 1px solid var(--primary);
    color: white;
}

.mobile-actions .btn-primary:hover,
.mobile-actions .btn-primary:focus {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
    outline: none;
}

/* Mobile notification optimizations */
@media (max-width: 768px) {
    .notification-item {
        padding: var(--space-4);
        border-radius: 0;
        border-left: none;
        border-bottom: 1px solid var(--border-light);
    }
    
    .notification-item.unread {
        border-left: 4px solid var(--primary);
        padding-left: calc(var(--space-4) - 4px);
    }
    
    .notification-actions {
        opacity: 1;
    }
    
    .notification-meta {
        flex-wrap: wrap;
    }
    
    .notification-category {
        font-size: 10px;
        padding: 2px var(--space-1);
    }
}

/* Dark theme notification styles */
[data-theme="dark"] .notification-item.unread {
    background-color: var(--gray-700);
}

[data-theme="dark"] .notification-title {
    color: var(--gray-100);
}

[data-theme="dark"] .notification-message {
    color: var(--gray-300);
}

[data-theme="dark"] .notification-meta {
    color: var(--gray-400);
}

[data-theme="dark"] .notification-category {
    background: var(--gray-600);
    color: var(--gray-200);
}

[data-theme="dark"] .empty-title {
    color: var(--gray-200);
}

[data-theme="dark"] .empty-message {
    color: var(--gray-400);
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --border-light: #000000;
        --border-medium: #000000;
        --border-dark: #000000;
    }
    
    .nav-link,
    .submenu-link,
    .dropdown-item {
        border: 1px solid transparent;
    }
    
    .nav-link:focus,
    .submenu-link:focus,
    .dropdown-item:focus {
        border-color: currentColor;
    }
}