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

/* Sidebar */
.app-sidebar {
  width: var(--sidebar-width);
  background-color: var(--bg-surface);
  border-right: 1px solid var(--border-main);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  z-index: 40;
  transition: transform var(--transition-normal);
}

.sidebar-header {
  padding: var(--space-lg) var(--space-md) var(--space-md);
  border-bottom: 1px solid var(--border-subtle);
}

.brand-title-wrap {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.brand-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  background-color: var(--primary-blue);
  color: #fff;
  font-weight: var(--weight-bold);
  font-size: var(--text-xs);
  letter-spacing: 0.05em;
}

.brand-title {
  font-size: var(--text-md);
  font-weight: var(--weight-bold);
  color: var(--text-main);
  letter-spacing: -0.01em;
}

.brand-tagline {
  font-size: var(--text-xs);
  color: var(--text-secondary);
  margin-top: var(--space-2xs);
  line-height: var(--leading-tight);
}

.sidebar-nav {
  flex: 1;
  padding: var(--space-md) var(--space-xs);
  overflow-y: auto;
}

.nav-section-title {
  font-size: 0.6875rem;
  font-weight: var(--weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-tertiary);
  padding: var(--space-xs) var(--space-sm);
  margin-top: var(--space-xs);
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.5rem var(--space-sm);
  margin-bottom: 2px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  transition: all var(--transition-fast);
  text-decoration: none;
}

.nav-item svg {
  width: 18px;
  height: 18px;
  stroke-width: 1.8;
  color: inherit;
  flex-shrink: 0;
}

.nav-item:hover {
  background-color: var(--bg-subtle);
  color: var(--text-main);
  text-decoration: none;
}

.nav-item.active {
  background-color: var(--primary-soft);
  color: var(--primary-deep);
  font-weight: var(--weight-semibold);
}

.nav-item.active svg {
  color: var(--primary-blue);
}

.nav-badge {
  margin-left: auto;
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  padding: 1px 7px;
  border-radius: var(--radius-full);
  background-color: var(--bg-muted);
  color: var(--text-secondary);
}

.nav-item.active .nav-badge {
  background-color: rgba(49, 87, 213, 0.15);
  color: var(--primary-deep);
}

.sidebar-footer {
  padding: var(--space-sm) var(--space-md);
  border-top: 1px solid var(--border-subtle);
  background-color: var(--bg-surface);
}

.storage-status-pill {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--text-xs);
  color: var(--text-secondary);
  padding: 4px 8px;
  border-radius: var(--radius-xs);
  background: var(--bg-subtle);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--teal-accent);
  flex-shrink: 0;
  transition: background-color var(--transition-fast);
}

.status-dot.saving {
  background-color: var(--warm-accent);
  animation: pulse 1s infinite alternate;
}

.status-dot.error {
  background-color: var(--danger-accent);
}

@keyframes pulse {
  from { opacity: 0.5; }
  to { opacity: 1; }
}

/* Main Content Area */
.app-main {
  margin-left: var(--sidebar-width);
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  min-width: 0;
}

/* Top App Bar */
.top-bar {
  height: var(--header-height);
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-main);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-xl);
  position: sticky;
  top: 0;
  z-index: 30;
}

.top-bar-left {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.top-bar-right {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.mobile-nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border-main);
  padding: 6px;
  border-radius: var(--radius-sm);
  color: var(--text-main);
}

.global-search-trigger {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 6px 12px;
  color: var(--text-secondary);
  font-size: var(--text-sm);
  min-width: 240px;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.global-search-trigger:hover {
  background-color: #fff;
  border-color: var(--border-strong);
  color: var(--text-main);
}

.shortcut-kbd {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-main);
  border-radius: 3px;
  padding: 1px 5px;
  color: var(--text-tertiary);
}

/* Content Container */
.page-container {
  padding: var(--space-xl);
  max-width: var(--content-max-width);
  width: 100%;
  margin: 0 auto;
  flex: 1;
}

.page-header {
  margin-bottom: var(--space-xl);
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.page-title {
  font-size: var(--text-2xl);
  font-weight: var(--weight-bold);
  color: var(--text-main);
  letter-spacing: -0.02em;
  line-height: var(--leading-tight);
}

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

.page-actions {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  flex-wrap: wrap;
}