/**
 * App shell: sidebar navigation + mobile drawer.
 * Import after base.css.
 */

.app-shell {
  display: flex;
  align-items: stretch;
  min-height: 100vh;
}

.app-top-bar {
  display: none;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-3) var(--sp-4);
  border-bottom: 2px solid var(--ink);
  background: var(--surface);
  flex-shrink: 0;
}

.top-bar-title {
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--ink);
}

.nav-drawer-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  border: 1px solid var(--border);
  background: var(--bg-alt);
  color: var(--ink);
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition);
}
.nav-drawer-toggle:hover {
  border-color: var(--text-muted);
  background: var(--border-light);
}
.nav-drawer-toggle-bars {
  display: block;
  width: 1.1rem;
  height: 2px;
  background: currentColor;
  box-shadow: 0 -5px 0 currentColor, 0 5px 0 currentColor;
}

.app-overlay { display: none; }
.app-main    { flex: 1; min-width: 0; }

/* ── Sidebar nav ── */
.app-shell > #site-nav.site-nav {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: var(--sp-4);
  padding: var(--sp-6) var(--sp-4);
  width: 15.5rem;
  flex-shrink: 0;
  border-bottom: none;
  border-right: 2px solid var(--ink);
  background: var(--surface);
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}
.app-shell > #site-nav.site-nav .nav-brand { margin: 0 0 var(--sp-3); align-self: flex-start; }
.nav-brand-wordmark {
  display: block;
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink);
  line-height: 1.2;
}

/* ── Nav sections ── */
.nav-sections {
  display: flex;
  flex-direction: column;
  gap: var(--sp-6);
}
.nav-section-label,
.nav-section-toggle {
  margin: 0 0 var(--sp-2);
  transition: color var(--transition), transform var(--transition);
}
.nav-section-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-2);
  width: 100%;
  padding: 0;
  border: none;
  background: transparent;
  font: inherit;
  text-align: left;
  cursor: pointer;
  color: var(--text-muted);
  font-family: var(--font-display);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.nav-section-toggle::after {
  content: '';
  flex-shrink: 0;
  width: 0.35rem;
  height: 0.35rem;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(-135deg);
  margin-bottom: -0.1rem;
  opacity: 0.55;
  transition: transform 0.2s ease, opacity var(--transition);
}
.nav-section--collapsed .nav-section-toggle::after {
  transform: rotate(45deg);
  margin-bottom: 0.05rem;
}
.nav-section-toggle:hover { color: var(--text); }
.nav-section-toggle:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 2px; }
.nav-section--active > .nav-section-label,
.nav-section--active > .nav-section-toggle { color: var(--ink); }
.nav-section--collapsed .nav-section-list { display: none; }

.nav-section-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.app-shell > #site-nav.site-nav .nav-section-list a {
  display: block;
  font-family: var(--font-display);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  padding: var(--sp-2) var(--sp-3);
  border-left: 3px solid transparent;
  border-bottom: none;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}
.app-shell > #site-nav.site-nav .nav-section-list a:hover {
  color: var(--text);
  background: var(--bg-alt);
}
.app-shell > #site-nav.site-nav .nav-section-list a.nav-active,
.app-shell > #site-nav.site-nav .nav-section-list a[aria-current="page"] {
  color: var(--ink);
  border-left-color: var(--accent);
  font-weight: 600;
  background: var(--accent-light);
}
.app-shell > #site-nav.site-nav .nav-section-list a.nav-active:hover,
.app-shell > #site-nav.site-nav .nav-section-list a[aria-current="page"]:hover {
  background: var(--accent-soft);
  color: var(--ink);
}

/* ── Nav search button ── */
.nav-search-btn {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  width: 100%;
  padding: var(--sp-2) var(--sp-3);
  border: 1px solid var(--border);
  background: var(--bg-alt);
  color: var(--text-muted);
  font-family: var(--font-display);
  font-size: 0.8125rem;
  font-weight: 500;
  cursor: pointer;
  text-align: left;
  transition: border-color var(--transition), color var(--transition), background var(--transition);
}
.nav-search-btn:hover { border-color: var(--text-muted); color: var(--text); background: var(--surface); }
.nav-search-icon      { font-size: 1rem; flex-shrink: 0; opacity: 0.6; }
.nav-search-btn-text  { flex: 1; }
.nav-search-kbd {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  padding: 1px 4px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-muted);
  line-height: 1.5;
  flex-shrink: 0;
}

/* ── Breadcrumb ── */
.portal-breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-2) var(--sp-8);
  border-bottom: 1px solid var(--border-light);
  background: var(--surface);
  font-family: var(--font-display);
  font-size: 0.75rem;
  color: var(--text-muted);
}
.portal-breadcrumb-home   { color: var(--text-muted); text-decoration: none; transition: color var(--transition); }
.portal-breadcrumb-home:hover { color: var(--ink); }
.portal-breadcrumb-sep    { color: var(--border); font-size: 0.875rem; user-select: none; }
.portal-breadcrumb-page   { color: var(--text); font-weight: 600; }

@media (max-width: 900px) { .portal-breadcrumb { display: none; } }

/* ── Search palette ── */
#search-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 10vh;
}
#search-overlay[hidden] { display: none !important; }
.search-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
}
.search-palette {
  position: relative;
  width: min(36rem, 92vw);
  background: var(--surface);
  border: 2px solid var(--ink);
  overflow: hidden;
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.2);
}
.search-input-row {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-3) var(--sp-4);
  border-bottom: 1px solid var(--border-light);
}
.search-input-icon { font-size: 1.125rem; color: var(--text-muted); flex-shrink: 0; }
.search-input {
  flex: 1;
  border: none;
  background: transparent;
  font-family: var(--font-display);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text);
  outline: none;
  min-width: 0;
}
.search-input::placeholder { color: var(--text-muted); }
.search-esc-hint {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  padding: 2px 5px;
  border: 1px solid var(--border);
  background: var(--bg-alt);
  color: var(--text-muted);
  flex-shrink: 0;
}
.search-results {
  list-style: none;
  margin: 0;
  padding: var(--sp-2) 0;
  max-height: 22rem;
  overflow-y: auto;
}
.search-result {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
  padding: var(--sp-3) var(--sp-4);
  cursor: pointer;
  transition: background var(--transition);
}
.search-result:hover,
.search-result--selected       { background: var(--accent-light); }
.search-result-label           { font-family: var(--font-display); font-size: 0.875rem; font-weight: 600; color: var(--text); }
.search-result--selected .search-result-label { color: var(--ink); }
.search-result-meta            { display: flex; flex-direction: column; align-items: flex-end; gap: 2px; text-align: right; flex-shrink: 0; }
.search-result-category        { font-family: var(--font-display); font-size: 0.6875rem; font-weight: 600; color: var(--text); white-space: nowrap; max-width: 10rem; overflow: hidden; text-overflow: ellipsis; }
.search-result-section         { font-family: var(--font-display); font-size: 0.6875rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.06em; white-space: nowrap; }
.search-no-results             { padding: var(--sp-4) var(--sp-5); font-size: 0.875rem; color: var(--text-muted); text-align: center; }

/* ── Mobile ── */
@media (max-width: 900px) {
  .app-shell { flex-direction: column; }

  .app-top-bar {
    display: flex;
    position: sticky;
    top: 0;
    z-index: 40;
  }
  .nav-drawer-toggle { display: inline-flex; }

  .app-shell > #site-nav.site-nav {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: min(18.5rem, 90vw);
    max-height: none;
    height: auto;
    z-index: 50;
    transform: translateX(-100%);
    transition: transform 0.2s ease;
    box-shadow: 4px 0 24px rgba(0, 0, 0, 0.08);
  }
  .app-shell.nav-drawer-open > #site-nav.site-nav { transform: translateX(0); }

  .app-shell .app-overlay {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.35);
    z-index: 45;
    border: none;
    padding: 0;
    margin: 0;
    cursor: pointer;
  }
  .app-shell.nav-drawer-open .app-overlay:not([hidden]) { display: block; }
  .app-shell .app-overlay[hidden] { display: none !important; }

  .app-main { width: 100%; }

  .app-shell > #site-nav.site-nav .nav-section-list a { padding: var(--sp-3) var(--sp-4); }
}

/* ── Print ── */
@media print {
  .app-top-bar, .nav-drawer-toggle, .app-overlay,
  .nav-search-btn, #search-overlay,
  button.portal-theme-toggle, .site-footer-theme-wrap { display: none !important; }

  .app-shell { display: block; }
  .app-shell > #site-nav.site-nav { display: none !important; }
  .app-main { width: 100%; max-width: none; }
}