/* Modern CSS Variables */
:root {
  --primary-color: #2563eb;
  --primary-hover: #1d4ed8;
  --secondary-color: #64748b;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --error-color: #ef4444;

  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;

  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;

  --border-color: #e2e8f0;
  --border-light: #f1f5f9;

  --sidebar-width: 280px;
  --sidebar-collapsed: 70px;
  --header-height: 70px;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 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);

  --transition-fast: 0.15s ease-in-out;
  --transition-normal: 0.3s ease-in-out;
  --transition-slow: 0.5s ease-in-out;

  --border-radius: 8px;
  --border-radius-lg: 12px;
}

/* Dark mode variables */
[data-theme="dark"] {
  --bg-primary: #1e293b;
  --bg-secondary: #334155;
  --bg-tertiary: #475569;

  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;

  --border-color: #475569;
  --border-light: #334155;
}

/* Reset and base styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    sans-serif;
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-secondary);
  overflow-x: hidden;
}

/* App container */
.app-container {
  display: flex;
  min-height: 100vh;
}

/* Sidebar styles */
.sidebar {
  width: var(--sidebar-width);
  background-color: var(--bg-primary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  position: fixed;
  height: 100vh;
  left: 0;
  top: 0;
  z-index: 1000;
  transition: transform var(--transition-normal);
  box-shadow: var(--shadow-md);
}

.sidebar.collapsed {
  width: var(--sidebar-collapsed);
}

.sidebar.collapsed .logo-text,
.sidebar.collapsed .menu-text {
  opacity: 0;
  transform: translateX(-10px);
}

.sidebar.collapsed .sidebar-footer {
  padding: 0 1rem;
}

.sidebar.collapsed .user-details {
  display: none;
}

/* Sidebar header */
.sidebar-header {
  padding: 1.5rem 1.25rem;
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary-color);
}

.logo i {
  font-size: 1.5rem;
}

.logo-text {
  transition: opacity var(--transition-normal),
    transform var(--transition-normal);
}

.sidebar-toggle {
  background: none;
  border: none;
  padding: 0.5rem;
  border-radius: var(--border-radius);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.sidebar-toggle:hover {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
}

/* Sidebar menu */
.sidebar-menu {
  flex: 1;
  overflow-y: auto;
  padding: 1rem 0;
}

.menu-list {
  list-style: none;
}

.menu-item {
  margin: 0.25rem 1rem;
}

.menu-link {
  display: flex;
  align-items: center;
  padding: 0.75rem 1rem;
  text-decoration: none;
  color: var(--text-secondary);
  border-radius: var(--border-radius);
  transition: all var(--transition-fast);
  gap: 1rem;
}

.menu-link:hover {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  transform: translateX(2px);
}

.menu-item.active .menu-link {
  background-color: var(--primary-color);
  color: white;
  box-shadow: var(--shadow-sm);
}

.menu-icon {
  font-size: 1.125rem;
  width: 1.5rem;
  text-align: center;
}

.menu-text {
  font-weight: 500;
  transition: opacity var(--transition-normal),
    transform var(--transition-normal);
}

/* Sidebar footer */
.sidebar-footer {
  padding: 1rem 1.25rem;
  border-top: 1px solid var(--border-light);
}

.user-info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.user-avatar {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  background-color: var(--primary-color);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.125rem;
}

.user-details {
  flex: 1;
}

.user-name {
  display: block;
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--text-primary);
}

.user-role {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
}

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

.sidebar.collapsed + .main-content {
  margin-left: var(--sidebar-collapsed);
}

/* Top header */
.top-header {
  height: var(--header-height);
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  padding: 0.5rem;
  border-radius: var(--border-radius);
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 1.125rem;
}

.page-title {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
}

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

.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.notification-btn,
.profile-btn {
  background: none;
  border: none;
  padding: 0.5rem;
  border-radius: 50%;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
  font-size: 1.25rem;
}

.notification-btn:hover,
.profile-btn:hover {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
}

.notification-badge {
  position: absolute;
  top: -2px;
  right: -2px;
  background-color: var(--error-color);
  color: white;
  font-size: 0.625rem;
  padding: 0.125rem 0.25rem;
  border-radius: 10px;
  min-width: 1rem;
  height: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Page content */
.page-content {
  flex: 1;
  padding: 2rem;
  background-color: var(--bg-secondary);
}

/* Overlay for mobile */
.overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 999;
}

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

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

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

  .mobile-menu-btn {
    display: block;
  }

  .overlay.active {
    display: block;
  }

  .page-content {
    padding: 1rem;
  }

  .top-header {
    padding: 0 1rem;
  }
}

@media (max-width: 480px) {
  .page-title {
    font-size: 1.25rem;
  }

  .header-actions {
    gap: 0.5rem;
  }
}

/* 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;
}

/* Smooth animations */
* {
  transition-property: background-color, border-color, color, fill, stroke,
    opacity, box-shadow, transform;
  transition-duration: var(--transition-fast);
  transition-timing-function: ease-in-out;
}