.app {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* ===== Sidebar ===== */
.sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  height: 100vh;
  background: var(--color-bg-secondary);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  transition: width var(--transition-normal), min-width var(--transition-normal);
  overflow: hidden;
  z-index: 100;
}

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

.sidebar.collapsed .sidebar-header {
  padding-left: 14px;
  padding-right: 14px;
}

.sidebar.collapsed .nav-category-label {
  font-size: 0;
  padding: 4px 12px;
  border-bottom: 1px solid var(--color-border);
  margin: 0 4px 4px;
}

.sidebar-header {
  padding: 20px 16px;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 64px;
  white-space: nowrap;
  transition: padding var(--transition-normal);
}

.logo-icon {
  width: 33px;
  height: 28px;
  flex-shrink: 0;
  border-radius: var(--radius-sm);
}

.logo {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-text-primary);
  white-space: nowrap;
  overflow: hidden;
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-hover));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 8px;
}

.nav-category {
  margin-bottom: 4px;
}

.nav-category-label {
  padding: 6px 12px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--color-text-muted);
  white-space: nowrap;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  overflow: hidden;
  font-size: 14px;
}

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

.nav-item.active {
  background: var(--color-accent-subtle);
  color: var(--color-accent-text);
}

.nav-item-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-item-label {
  overflow: hidden;
  text-overflow: ellipsis;
}

.nav-item-badge {
  margin-left: auto;
  padding: 1px 6px;
  font-size: 10px;
  font-weight: 600;
  border-radius: var(--radius-full);
  background: var(--color-accent);
  color: white;
}

.sidebar-footer {
  padding: 8px;
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.sidebar-history {
  text-decoration: none;
}

.sidebar-toggle {
  width: 100%;
  padding: 8px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  transition: all var(--transition-fast);
}

.sidebar-toggle svg {
  transition: transform var(--transition-fast);
}

.sidebar.collapsed .sidebar-toggle svg {
  transform: rotate(180deg);
}

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

/* ===== Main Content ===== */
.main {
  flex: 1;
  height: 100vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

.main-header {
  padding: 16px 24px;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 56px;
  background: var(--color-bg-secondary);
  position: sticky;
  top: 0;
  z-index: 50;
}

.main-header-title {
  font-size: 18px;
  font-weight: 600;
}

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

.main-content {
  flex: 1;
  padding: 32px 40px;
  max-width: var(--content-max-width);
  width: 100%;
  margin: 0 auto;
}

/* ===== History Panel ===== */
.history-panel {
  width: 360px;
  height: 100vh;
  background: var(--color-bg-secondary);
  border-left: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform var(--transition-normal);
  position: fixed;
  right: 0;
  top: 0;
  z-index: 200;
}

.history-panel.open {
  transform: translateX(0);
}

.history-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: 4px;
  min-height: 56px;
}

.history-header h2 {
  font-size: 16px;
  font-weight: 600;
}

.history-close {
  margin-left: auto;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  font-size: 20px;
  color: var(--color-text-muted);
}

.history-close:hover {
  background: var(--color-bg-hover);
  color: var(--color-text-primary);
}

.history-list {
  flex: 1;
  overflow-y: auto;
  padding: 12px;
}

.history-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 199;
  display: none;
}

.history-overlay.open {
  display: block;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    transform: translateX(-100%);
    z-index: 300;
  }

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

  .main-content {
    padding: 16px;
  }

  .history-panel {
    width: 100%;
  }
}