/*
 * Layout: app shell (header, navigation, main), plain pages (login, errors), page header, grids.
 * Only var(--…) from tokens.css; lengths in media queries are the only literal lengths.
 */

/* ------------------------------------------------------------------ app shell */

.app-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  grid-template-areas:
    "header"
    "nav"
    "main";
  min-height: 100vh;
}

.app-header {
  grid-area: header;
  position: sticky;
  top: 0;
  z-index: var(--pe-z-header);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-xl);
  min-height: var(--pe-header-height);
  padding: var(--spacing-md) var(--spacing-xl);
  background: var(--pe-surface-header);
  border-bottom: var(--pe-border-width) solid var(--color-border-secondary);
}

.app-brand,
.plain-brand {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-md);
  color: var(--color-text-primary);
  font-weight: var(--font-weight-semibold);
  text-decoration: none;
}

.app-brand:hover {
  color: var(--color-text-primary);
}

.app-brand span {
  white-space: nowrap;
}

.brand-mark {
  width: var(--pe-icon-size-lg);
  height: var(--pe-icon-size-lg);
  color: var(--color-fg-brand-primary);
}

.app-sidebar {
  grid-area: nav;
  background: var(--pe-surface-sidebar);
  border-bottom: var(--pe-border-width) solid var(--color-border-secondary);
  padding: var(--spacing-md) var(--spacing-xl);
}

.app-main {
  grid-area: main;
  width: 100%;
  max-width: var(--pe-content-max);
  padding: var(--spacing-3xl) var(--spacing-xl) var(--spacing-5xl);
}

.nav-wide {
  display: none;
}

@media (min-width: 64em) {
  .app-shell {
    grid-template-columns: var(--pe-sidebar-width) minmax(0, 1fr);
    grid-template-areas:
      "header header"
      "nav main";
  }

  .app-sidebar {
    position: sticky;
    top: var(--pe-header-height);
    align-self: start;
    height: calc(100vh - var(--pe-header-height));
    overflow-y: auto;
    border-bottom: 0;
    border-inline-end: var(--pe-border-width) solid var(--color-border-secondary);
    padding: var(--spacing-xl) var(--spacing-lg);
  }

  .app-main {
    padding: var(--spacing-4xl) var(--spacing-4xl) var(--spacing-5xl);
  }

  .nav-fold {
    display: none;
  }

  .nav-wide {
    display: block;
  }
}


/* ------------------------------------------------------------------ navigation */

.nav-fold-summary {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  min-height: var(--pe-control-height);
  cursor: pointer;
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  list-style: none;
}

.nav-fold-summary::-webkit-details-marker {
  display: none;
}

.nav-section {
  margin-block: var(--spacing-lg);
}

.nav-section-title {
  margin: 0 0 var(--spacing-xs);
  padding-inline: var(--spacing-md);
  font-size: var(--text-xs);
  line-height: var(--leading-xs);
  font-weight: var(--font-weight-semibold);
  letter-spacing: var(--pe-letter-spacing-caps);
  text-transform: uppercase;
  color: var(--color-text-tertiary);
}

.nav-section ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  display: block;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: var(--text-sm);
  line-height: var(--leading-sm);
}

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

.nav-link.active {
  background: var(--color-bg-active);
  color: var(--color-text-brand-primary);
  font-weight: var(--font-weight-semibold);
}

.user-menu {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: var(--spacing-md);
}

@media (max-width: 40em) {
  .user-menu-name .badge {
    display: none;
  }
}

.user-menu-name {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: var(--text-sm);
}

/* ------------------------------------------------------------------ page header and grids */

.page-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-3xl);
}

.page-header h1 {
  margin: 0;
}

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

.grid {
  display: grid;
  gap: var(--spacing-xl);
}

.grid-tiles {
  grid-template-columns: repeat(auto-fill, minmax(var(--pe-tile-min), 1fr));
}

.form-columns {
  display: grid;
  gap: var(--spacing-xl);
  grid-template-columns: repeat(auto-fit, minmax(var(--pe-tile-min), 1fr));
  align-items: start;
}

.form-grid {
  display: grid;
  gap: 0 var(--spacing-xl);
  grid-template-columns: repeat(auto-fit, minmax(var(--pe-tile-min), 1fr));
}

.narrow {
  max-width: var(--pe-narrow-max);
}

/* ------------------------------------------------------------------ plain pages (login, errors) */

.plain-main {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xl);
  min-height: 100vh;
  padding: var(--spacing-3xl) var(--spacing-xl);
}

.plain-card {
  width: 100%;
  max-width: var(--pe-narrow-max);
  padding: var(--spacing-4xl) var(--spacing-3xl);
  background: var(--pe-surface-card);
  border: var(--pe-border-width) solid var(--color-border-secondary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.plain-card h1 {
  font-size: var(--text-xl);
  line-height: var(--leading-lg);
}

.plain-brand {
  margin-bottom: var(--spacing-3xl);
}

.plain-footer {
  display: flex;
  justify-content: center;
}

/* ------------------------------------------------------------------ session warning */

.session-warning {
  position: fixed;
  inset-inline-end: var(--spacing-xl);
  inset-block-end: var(--spacing-xl);
  z-index: var(--pe-z-toast);
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  max-width: var(--pe-narrow-max);
  padding: var(--spacing-lg) var(--spacing-xl);
  background: var(--color-bg-warning-subtle);
  color: var(--color-text-primary);
  border: var(--pe-border-width) solid var(--badge-warning-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
}

.session-warning p {
  margin: 0;
}