/* Stage 9 — search, mobile navigation and active article sections. */

html.has-overlay,
body.has-overlay {
  overflow: hidden;
}

.search-dialog[hidden],
.mobile-drawer[hidden],
.drawer-backdrop[hidden],
.search-clear[hidden],
.search-empty[hidden] {
  display: none !important;
}

/* Full-text search */
.search-dialog {
  position: fixed;
  z-index: var(--z-dialog);
  inset: 0;
  display: grid;
  place-items: start center;
  padding: calc(var(--header-height) + var(--space-6)) var(--page-gutter) var(--space-8);
}

.search-dialog__backdrop {
  position: absolute;
  inset: 0;
  background: color-mix(in srgb, var(--color-navy-950) 66%, transparent);
  backdrop-filter: blur(4px);
}

.search-dialog__surface {
  position: relative;
  width: min(46rem, 100%);
  max-height: calc(100vh - var(--header-height) - var(--space-12));
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border: var(--border-width) solid var(--color-blue-300);
  border-radius: var(--radius-lg);
  background: var(--color-paper);
  box-shadow: var(--shadow-overlay);
}

.search-dialog__heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-5);
  padding: var(--space-6) var(--space-6) var(--space-4);
}

.search-dialog__heading h2 {
  margin: var(--space-1) 0 var(--space-2);
  color: var(--color-navy-950);
  font-size: var(--font-size-h3);
}

.search-dialog__heading p {
  max-width: var(--measure-lead);
  margin: 0;
  color: var(--color-muted);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-compact);
}

.search-dialog__close {
  flex: 0 0 auto;
  font-size: var(--font-size-h3);
  line-height: 1;
}

.search-form {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin: 0 var(--space-6);
  padding: 0 var(--space-4);
  border: 2px solid var(--color-blue-300);
  border-radius: var(--radius-md);
  background: var(--color-paper);
  transition:
    border-color var(--duration-fast) var(--ease-standard),
    box-shadow var(--duration-fast) var(--ease-standard);
}

.search-form:focus-within {
  border-color: var(--color-blue-700);
  box-shadow: var(--focus-ring);
}

.search-form > .icon {
  flex: 0 0 auto;
  color: var(--color-blue-700);
}

.search-field {
  height: var(--control-lg);
  font-size: var(--font-size-lg);
}

.search-field::-webkit-search-cancel-button {
  display: none;
}

.search-clear {
  min-height: var(--target-min);
  padding: 0 var(--space-2);
  border: 0;
  color: var(--color-blue-700);
  background: transparent;
  font: inherit;
  font-size: var(--font-size-sm);
  font-weight: 800;
  cursor: pointer;
}

.search-clear:hover {
  color: var(--color-navy-950);
}

.search-dialog .search-panel__meta {
  margin-top: var(--space-4);
  padding-inline: var(--space-6);
}

.search-panel__meta kbd {
  padding: 0.1rem var(--space-2);
  border: var(--border-width) solid var(--color-line);
  border-bottom-width: 2px;
  border-radius: var(--radius-xs);
  color: var(--color-muted);
  background: var(--color-paper);
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
}

.search-dialog .search-results {
  min-height: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: var(--space-2) var(--space-4) var(--space-4);
}

.search-dialog .search-results:empty {
  display: none;
}

.search-result {
  border: var(--border-width) solid transparent;
}

.search-result:focus-visible {
  border-color: var(--color-blue-500);
  outline: 0;
  box-shadow: var(--focus-ring);
}

.search-results [role="option"][aria-selected="true"] {
  background: var(--color-blue-50);
  box-shadow: inset 3px 0 var(--color-blue-700);
}

.search-result__title-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-4);
}

.search-result__page {
  flex: 0 0 auto;
  color: var(--color-muted);
  font-size: var(--font-size-xs);
  font-weight: 600;
}

.search-result mark {
  padding: 0 0.08em;
  border-radius: 0.15em;
  color: inherit;
  background: var(--color-warning-bg);
  box-decoration-break: clone;
}

.search-empty {
  margin: var(--space-2) var(--space-4) var(--space-4);
  padding: var(--space-8) var(--space-5);
  border: var(--border-width) dashed var(--color-blue-300);
  border-radius: var(--radius-md);
  color: var(--color-muted);
  background: var(--color-blue-50);
  text-align: center;
}

.search-empty > .icon {
  width: var(--space-8);
  height: var(--space-8);
  margin-bottom: var(--space-3);
  color: var(--color-blue-700);
}

.search-empty strong {
  display: block;
  margin-bottom: var(--space-1);
  color: var(--color-navy-950);
}

.search-empty p {
  max-width: 32rem;
  margin: 0 auto;
  font-size: var(--font-size-sm);
  line-height: var(--line-height-compact);
}

/* Mobile navigation drawer */
.mobile-drawer {
  padding: 0;
  overscroll-behavior: contain;
}

.mobile-drawer__header {
  position: sticky;
  z-index: 1;
  top: 0;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-5) var(--space-4) var(--space-4);
  border-bottom: var(--border-width) solid var(--color-line);
  background: var(--color-paper);
}

.mobile-drawer__header h2 {
  margin: var(--space-1) 0 0;
  color: var(--color-navy-950);
  font-size: var(--font-size-h3);
}

.mobile-drawer > .site-nav {
  padding: var(--space-4) var(--space-3) var(--space-8);
}

.drawer-backdrop {
  opacity: 1;
  backdrop-filter: blur(2px);
}

/* The active section is shared by the desktop and inline contents. */
.article-toc__link {
  transition:
    color var(--duration-fast) var(--ease-standard),
    background var(--duration-fast) var(--ease-standard),
    box-shadow var(--duration-fast) var(--ease-standard);
}

.article-toc__link[aria-current="location"] {
  box-shadow: inset 3px 0 var(--color-blue-700);
}

@media (max-width: 44.999rem) {
  .search-dialog {
    place-items: stretch;
    padding: var(--header-height) 0 0;
  }

  .search-dialog__surface {
    width: 100%;
    max-height: calc(100vh - var(--header-height));
    min-height: calc(100vh - var(--header-height));
    border: 0;
    border-radius: 0;
  }

  .search-dialog__heading {
    padding: var(--space-5) var(--space-4) var(--space-3);
  }

  .search-dialog__heading p {
    display: none;
  }

  .search-form {
    margin-inline: var(--space-4);
  }

  .search-dialog .search-panel__meta {
    padding-inline: var(--space-4);
  }

  .search-result__title-row {
    display: block;
  }

  .search-result__page {
    display: block;
    margin-top: var(--space-1);
  }

  .mobile-drawer {
    width: min(22rem, calc(100vw - var(--space-8)));
  }
}

@media (prefers-reduced-motion: reduce) {
  .search-dialog__backdrop,
  .drawer-backdrop {
    backdrop-filter: none;
  }
}

@media (forced-colors: active) {
  .search-result mark {
    color: HighlightText;
    background: Highlight;
  }
}