/**
 * App shell — header, footer, user menu
 */

.app-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  height: var(--header-height);
  background: color-mix(in srgb, var(--color-bg-elevated) 88%, transparent);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
}

.app-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  padding-inline: var(--space-4);
}

@media (min-width: 640px) {
  .app-header__inner {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    justify-content: stretch;
  }
}

@media (min-width: 768px) {
  .app-header__inner {
    padding-inline: var(--space-6);
  }
}

.app-header__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-text);
  flex-shrink: 0;
}

.app-header__brand:hover {
  text-decoration: none;
  color: var(--color-brand-600);
}

.app-header__logo-svg {
  width: 2rem;
  height: 2rem;
  color: var(--color-brand-600);
  flex-shrink: 0;
}

.app-header__title {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  letter-spacing: -0.02em;
  display: none;
}

@media (min-width: 640px) {
  .app-header__title {
    display: inline;
  }
}

.app-header__search {
  display: flex;
  justify-content: center;
  min-width: 0;
}

@media (max-width: 639px) {
  .app-header__search {
    display: none;
  }
}

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

@media (min-width: 640px) {
  .app-header__actions {
    justify-self: end;
  }
}

.app-header__user {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.user-menu {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.user-menu__avatar {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: var(--radius-full);
  background: var(--color-brand-600);
  color: #fff;
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  text-decoration: none;
  flex-shrink: 0;
}

.user-menu__avatar:hover {
  background: var(--color-brand-700);
  color: #fff;
  text-decoration: none;
}

.user-menu__name {
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  max-width: 6rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  display: none;
  text-decoration: none;
}

.user-menu__name:hover {
  color: var(--color-brand-600);
  text-decoration: none;
}

@media (min-width: 768px) {
  .user-menu__name {
    display: inline;
  }
}

/* Theme toggle icons */
.theme-toggle-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg-elevated);
  cursor: pointer;
  color: var(--color-text-secondary);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.theme-toggle-btn:hover {
  background: var(--color-bg-muted);
  color: var(--color-text);
}

.theme-icon--moon {
  display: none;
}

[data-theme="dark"] .theme-icon--sun {
  display: none;
}

[data-theme="dark"] .theme-icon--moon {
  display: block;
}

/* Welcome banner */
.welcome-banner {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-5);
  margin-bottom: var(--space-8);
  background: var(--color-success-bg);
  border: 1px solid rgba(5, 150, 105, 0.2);
  border-radius: var(--radius-xl);
}

.welcome-banner__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: var(--radius-full);
  background: var(--color-success);
  color: #fff;
  font-size: var(--text-sm);
  font-weight: var(--font-bold);
  flex-shrink: 0;
}

.welcome-banner strong {
  display: block;
  color: var(--color-success);
  font-size: var(--text-base);
  margin-bottom: var(--space-1);
}

.welcome-banner p {
  margin: 0;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

#signed-in-banner {
  margin-bottom: var(--space-6);
}

.home-greeting {
  text-align: center;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin: 0 0 var(--space-6);
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg-muted);
  border-radius: var(--radius-lg);
}

/* Profile */
.profile-card {
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  box-shadow: var(--shadow-md);
}

.profile-card__header {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  margin-bottom: var(--space-8);
}

.profile-card__avatar {
  width: 4.5rem;
  height: 4.5rem;
  border-radius: var(--radius-full);
  background: linear-gradient(145deg, var(--color-brand-500), var(--color-brand-700));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
  flex-shrink: 0;
  box-shadow: var(--shadow-md);
}

.profile-card__identity {
  min-width: 0;
}

.profile-card__name-row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin-bottom: var(--space-1);
}

.profile-card__name {
  margin: 0;
  font-size: var(--text-2xl);
  font-weight: var(--font-bold);
  letter-spacing: -0.02em;
}

.profile-status {
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  color: var(--color-success);
  background: var(--color-success-bg);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-full);
}

.profile-card__email {
  margin: 0;
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
}

.profile-stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
  margin-bottom: var(--space-8);
  padding: var(--space-5);
  background: var(--color-bg-muted);
  border-radius: var(--radius-lg);
}

@media (min-width: 540px) {
  .profile-stats {
    grid-template-columns: repeat(3, 1fr);
  }
}

.profile-stat {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.profile-stat__label {
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.profile-stat__value {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--color-text);
}

.profile-stat__value--mono {
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

.profile-section {
  margin-bottom: var(--space-8);
}

.profile-section__title {
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
  margin: 0 0 var(--space-4);
}

.profile-search-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.profile-search-list__item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

.profile-search-list__item:last-child {
  border-bottom: none;
}

.profile-search-list__query {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-text);
}

.profile-search-list__date {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  white-space: nowrap;
}

.profile-search-empty {
  padding: var(--space-6) var(--space-4);
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.profile-search-empty span {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.profile-search-empty small {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.profile-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  padding-top: var(--space-2);
}

/* Footer */
.app-footer {
  margin-top: auto;
  padding: var(--space-10) var(--space-4) var(--space-8);
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-subtle);
}

.app-footer__inner {
  text-align: center;
}

.app-footer__nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-5);
  flex-wrap: wrap;
  margin-bottom: var(--space-4);
}

.app-footer__name {
  margin: 0;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.app-footer__nav a {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  text-decoration: none;
}

.app-footer__nav a:hover {
  color: var(--color-brand-600);
}

/* ── Mobile Menu & Search Buttons ── */
.app-header__menu-btn {
  display: none;
  position: absolute;
  left: var(--space-4);
  top: 50%;
  transform: translateY(-50%);
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg-elevated);
  cursor: pointer;
  color: var(--color-text-secondary);
  transition: background var(--transition-fast), color var(--transition-fast);
  z-index: 10;
}

@media (min-width: 768px) {
  .app-header__menu-btn {
    left: var(--space-6);
  }
}

.app-header__menu-btn:hover {
  background: var(--color-bg-muted);
  color: var(--color-text);
}

.reader-page .app-header__menu-btn {
  display: inline-flex;
}
.reader-page .app-header__brand {
  padding-left: 3rem;
}
@media (min-width: 768px) {
  .reader-page .app-header__brand {
    padding-left: 3.5rem;
  }
}

.app-header__mobile-search-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg-elevated);
  cursor: pointer;
  color: var(--color-text-secondary);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.app-header__mobile-search-btn:hover {
  background: var(--color-bg-muted);
  color: var(--color-text);
}

@media (min-width: 640px) {
  .app-header__mobile-search-btn {
    display: none;
  }
}

.app-header__toc-toggle-btn {
  display: none;
}

@media (min-width: 1024px) {
  .reader-page .app-header__toc-toggle-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.25rem;
    height: 2.25rem;
    padding: 0;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-bg-elevated);
    cursor: pointer;
    color: var(--color-text-secondary);
    transition: background var(--transition-fast), color var(--transition-fast);
  }

  .reader-page .app-header__toc-toggle-btn:hover {
    background: var(--color-bg-muted);
    color: var(--color-text);
  }
}