/* Header component — app shell top bar (Icon Button / Avatar / Dropdown Menu / Badge patterns) */

.app-header {
  position: fixed;
  top: 0;
  inset-inline-start: var(--sidebar-width-collapsed);
  inset-inline-end: 0;
  height: var(--header-height);
  background: var(--surface-header);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-5);
  z-index: var(--z-header);
  transition: inset-inline-start var(--transition-shell);
}

.app-shell.sidebar-expanded .app-header {
  inset-inline-start: var(--sidebar-width-expanded);
}

.app-header-left {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  min-width: 0;
}

.app-header-logo {
  height: 24px;
  width: auto;
  /* PNG is full-color; whiten it for the green gradient header */
  filter: brightness(0) invert(1);
  flex-shrink: 0;
}

.app-header-app-name {
  color: var(--text-on-brand);
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-bold);
  white-space: nowrap;
}

.app-header-title-divider {
  width: 1px;
  height: 20px;
  background: rgba(255, 255, 255, 0.3);
  flex-shrink: 0;
}

.app-header-title {
  color: var(--text-on-brand);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.app-header-right {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

.app-header-icon-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  border: none;
  background: transparent;
  color: var(--text-on-brand);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 15px;
  transition: background 120ms ease;
}

.app-header-icon-btn:hover {
  background: rgba(255, 255, 255, 0.16);
}

#lang-toggle-btn {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  letter-spacing: 0.02em;
}

.app-header-ai-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  height: 36px;
  padding: 0 var(--space-3);
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.35);
  background: rgba(255, 255, 255, 0.12);
  color: var(--text-on-brand);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: background 120ms ease;
}

.app-header-ai-btn:hover {
  background: rgba(255, 255, 255, 0.22);
}

.app-header-divider {
  width: 1px;
  height: 24px;
  background: rgba(255, 255, 255, 0.3);
  margin: 0 var(--space-1);
}

/* ---- Create (+) dropdown ---- */

.app-header-create-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  height: 36px;
  padding: 0 var(--space-4);
  border-radius: var(--radius-md);
  border: none;
  background: var(--color-neutral-0);
  color: var(--color-green-700);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  cursor: pointer;
  box-shadow: var(--shadow-sm);
}

.app-header-create-btn:hover {
  background: var(--color-neutral-50);
}

/* ---- Generic header dropdown menu ---- */

.app-header-dropdown {
  position: relative;
}

.app-header-menu {
  position: absolute;
  top: calc(100% + var(--space-2));
  inset-inline-end: 0;
  min-width: 200px;
  background: var(--surface-card);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: var(--space-2);
  display: none;
  z-index: var(--z-dropdown);
}

.app-header-menu.open {
  display: block;
}

.app-header-menu-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: var(--font-size-md);
  cursor: pointer;
}

.app-header-menu-item:hover {
  background: var(--surface-hover);
}

.app-header-menu-item i {
  width: 16px;
  color: var(--text-secondary);
  text-align: center;
}

.app-header-menu-divider {
  height: 1px;
  background: var(--border-default);
  margin: var(--space-2) 0;
}

/* ---- Avatar ---- */

.app-header-avatar-btn {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  height: 36px;
  padding: 0 var(--space-1) 0 0;
  border: none;
  background: transparent;
  cursor: pointer;
  border-radius: var(--radius-md);
}

.app-header-avatar {
  width: 30px;
  height: 30px;
  border-radius: var(--radius-full);
  background: var(--color-neutral-0);
  color: var(--color-green-700);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  flex-shrink: 0;
}

.app-header-avatar-chevron {
  color: var(--text-on-brand);
  font-size: 11px;
}

.app-header-user-meta {
  padding: var(--space-2) var(--space-3) var(--space-3);
}

.app-header-user-name {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
}

.app-header-user-email {
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
  margin-top: 2px;
}

/* ---- Narrow viewports: collapse labels down to icon-only controls ---- */
@media (max-width: 640px) {
  .app-header {
    padding: 0 var(--space-2);
    gap: var(--space-2);
  }

  .app-header-app-name,
  .app-header-title-divider,
  .app-header-title {
    display: none;
  }

  .app-header-ai-btn span,
  .app-header-create-btn span {
    display: none;
  }

  .app-header-ai-btn,
  .app-header-create-btn {
    padding: 0;
    width: 36px;
    justify-content: center;
  }

  .app-header-right {
    gap: var(--space-1);
  }
}