/* Layout Styles */

/* Utility Classes */
.hidden {
  display: none !important;
}

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

/* Loading Screen */
.loading-screen {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background-color: var(--claude-bg);
  z-index: var(--z-loading);
}

.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--claude-border);
  border-top-color: var(--claude-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.loading-screen p {
  margin-top: var(--spacing-md);
  color: var(--claude-text-secondary);
  font-size: var(--font-size-sm);
}

/* App Layout */
.app {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

/* Header */
.app-header {
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--spacing-lg);
  background-color: var(--claude-surface);
  border-bottom: 1px solid var(--claude-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-left {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.app-logo {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--claude-primary);
}

.header-right {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

/* User Menu */
.user-menu {
  position: relative;
}

.user-avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--claude-primary), var(--claude-accent));
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-weight-semibold);
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.user-avatar:hover {
  transform: scale(1.05);
}

.dropdown {
  position: absolute;
  top: calc(100% + var(--spacing-sm));
  right: 0;
  min-width: 200px;
  background-color: var(--claude-surface);
  border: 1px solid var(--claude-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--spacing-sm);
  z-index: var(--z-dropdown);
}

.dropdown-item {
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

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

/* App Body */
.app-body {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* Sidebar */
.sidebar {
  width: var(--sidebar-width);
  background-color: var(--claude-surface);
  border-right: 1px solid var(--claude-border);
  padding: var(--spacing-lg) 0;
  overflow-y: auto;
  transition: transform var(--transition-base);
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  padding: 0 var(--spacing-md);
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  border-radius: var(--radius-lg);
  color: var(--claude-text-secondary);
  font-weight: var(--font-weight-medium);
  transition: all var(--transition-fast);
}

.nav-item:hover {
  background-color: var(--claude-bg);
  color: var(--claude-text-primary);
}

.nav-item.active {
  background-color: var(--claude-primary-light);
  color: var(--claude-primary-dark);
}

.nav-icon {
  font-size: var(--font-size-xl);
  width: 24px;
  text-align: center;
}

/* Main Content */
.main-content {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-xl);
  background-color: var(--claude-bg);
}

/* Page Header */
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-xl);
}

.page-title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  color: var(--claude-text-primary);
}

.page-actions {
  display: flex;
  gap: var(--spacing-md);
}

/* Responsive */
@media (max-width: 1024px) {
  .main-content {
    padding: var(--spacing-lg);
  }
}

@media (max-width: 640px) {
  .sidebar {
    position: fixed;
    left: 0;
    top: var(--header-height);
    bottom: 0;
    transform: translateX(-100%);
    z-index: 50;
  }

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

  .app-header {
    padding: 0 var(--spacing-md);
  }

  .main-content {
    padding: var(--spacing-md);
  }

  .page-title {
    font-size: var(--font-size-2xl);
  }
}