/* Alberta Oil — site shell: header, menu, search palette, footer, toasts. */
:root { --ao-header-h: 58px; }
html { scroll-padding-top: calc(var(--ao-header-h) + 16px); }
body.ao-page { padding-block-start: 0; }

.ao-skip { position: absolute; left: 12px; top: -60px; z-index: 100; background: var(--ink); color: var(--ground); padding: 10px 14px; border-radius: var(--radius); font: 600 0.9rem/1 var(--display); text-decoration: none; }
.ao-skip:focus { top: 12px; }

.ao-hdr {
  position: sticky; top: env(safe-area-inset-top, 0px); z-index: 50;
  margin-inline: -16px; padding-inline: 16px;
  background: color-mix(in srgb, var(--ground) 88%, transparent);
  -webkit-backdrop-filter: saturate(1.4) blur(10px); backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--line);
  transition: transform 0.25s ease;
}
.ao-hdr.is-hidden { transform: translateY(calc(-100% - 2px)); }
.ao-hdr-in { max-width: 1180px; margin-inline: auto; height: var(--ao-header-h); display: flex; align-items: center; gap: 20px; }
.ao-page .ao-brand { display: flex; align-items: center; gap: 8px; text-decoration: none; color: var(--ink); white-space: nowrap; }
.ao-brand b { font: 900 1.02rem/1 var(--display); font-stretch: 125%; letter-spacing: 0.03em; text-transform: uppercase; }
.ao-brand b span { color: var(--ochre); }
.ao-nav { display: flex; gap: 4px; margin-left: 8px; }
.ao-page .ao-nav a { font: 600 0.88rem/1 var(--display); font-stretch: 104%; color: var(--muted); text-decoration: none; padding: 9px 11px; border-radius: 6px; }
.ao-page .ao-nav a:hover { color: var(--ink); background: color-mix(in srgb, var(--ink) 6%, transparent); }
.ao-page .ao-nav a[aria-current="page"] { color: var(--ink); box-shadow: inset 0 -2px 0 var(--ochre); border-radius: 0; }
.ao-hdr-tools { margin-left: auto; display: flex; align-items: center; gap: 8px; }
.ao-search-btn {
  display: flex; align-items: center; gap: 10px; min-width: 220px;
  font: 500 0.85rem/1 var(--mono); color: var(--muted);
  background: var(--surface); border: 1px solid var(--line); border-radius: 8px; padding: 9px 10px; cursor: pointer;
}
.ao-search-btn:hover { border-color: var(--muted); }
.ao-search-btn kbd, .ao-pal kbd { margin-left: auto; font: 500 0.72rem/1 var(--mono); border: 1px solid var(--line); border-bottom-width: 2px; border-radius: 4px; padding: 3px 5px; color: var(--muted); background: var(--ground); }
.ao-icon-btn { display: grid; place-items: center; width: 38px; height: 38px; border-radius: 8px; border: 1px solid var(--line); background: var(--surface); color: var(--ink); cursor: pointer; }
.ao-icon-btn:hover { border-color: var(--muted); }
.ao-icon-btn svg, .ao-search-btn svg { width: 18px; height: 18px; flex: none; }
.ao-menu-btn { display: none; }
.ao-hdr :focus-visible, .ao-pal :focus-visible, .ao-ftr :focus-visible { outline: 2px solid var(--flare); outline-offset: 2px; }

@media (max-width: 860px) {
  .ao-nav { display: none; }
  .ao-menu-btn { display: grid; }
  .ao-search-btn { min-width: 0; padding: 9px; }
  .ao-search-btn .lbl, .ao-search-btn kbd { display: none; }
}
.ao-sheet { position: fixed; inset: 0; z-index: 60; background: color-mix(in srgb, #000 40%, transparent); display: flex; justify-content: flex-end; }
.ao-sheet-in { width: min(340px, 88vw); height: 100%; background: var(--ground); border-left: 1px solid var(--line); padding: calc(env(safe-area-inset-top, 0px) + 14px) 18px 24px; display: flex; flex-direction: column; gap: 6px; overflow: auto; }
.ao-page .ao-sheet a { font: 700 1.2rem/1.2 var(--display); font-stretch: 108%; color: var(--ink); text-decoration: none; padding: 12px 0; border-bottom: 1px solid var(--line); }
.ao-sheet .ao-icon-btn { align-self: flex-end; margin-bottom: 8px; }

/* search palette */
.ao-pal { position: fixed; inset: 0; z-index: 80; background: color-mix(in srgb, #0b0d0f 45%, transparent); display: flex; justify-content: center; align-items: flex-start; padding: max(10vh, calc(env(safe-area-inset-top, 0px) + 16px)) 16px 16px; }
.ao-pal-box { width: min(680px, 100%); max-height: min(640px, 80vh); display: flex; flex-direction: column; background: var(--surface); color: var(--ink); border: 1px solid var(--line); border-radius: 12px; box-shadow: 0 24px 60px rgba(0,0,0,.28); overflow: hidden; }
.ao-pal-top { display: flex; align-items: center; gap: 10px; padding: 14px 16px; border-bottom: 1px solid var(--line); }
.ao-pal-top svg { width: 20px; height: 20px; color: var(--muted); flex: none; }
.ao-pal input { flex: 1; min-width: 0; border: 0; outline: 0; background: transparent; color: var(--ink); font: 400 1.15rem/1.3 var(--body); }
.ao-pal-list { list-style: none; margin: 0; padding: 6px; overflow: auto; }
.ao-pal-group { font: 500 0.7rem/1 var(--mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--ochre); padding: 12px 10px 6px; }
.ao-page .ao-pal-item { display: flex; flex-direction: column; gap: 3px; padding: 10px; border-radius: 8px; color: var(--ink); text-decoration: none; }
.ao-pal-item strong { font: 650 0.98rem/1.3 var(--display); font-stretch: 102%; }
.ao-pal-item small { font: 400 0.85rem/1.4 var(--body); color: var(--muted); overflow: hidden; text-overflow: ellipsis; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }
.ao-pal-item em { order: -1; font: 500 0.68rem/1.3 var(--mono); font-style: normal; color: var(--muted); letter-spacing: 0.02em; }
.ao-pal-item em:empty { display: none; }
.ao-pal input:focus-visible { outline: none; }
.ao-pal input::-webkit-search-cancel-button { display: none; }
.ao-pal-item mark { background: color-mix(in srgb, var(--ochre) 28%, transparent); color: inherit; border-radius: 2px; }
.ao-pal-item[aria-selected="true"] { background: color-mix(in srgb, var(--accent) 12%, transparent); box-shadow: inset 3px 0 0 var(--accent); }
.ao-pal-empty { padding: 18px 14px; color: var(--muted); font-size: 0.95rem; display: flex; flex-direction: column; gap: 10px; }
.ao-pal-empty .ao-row button { font: 500 0.8rem/1 var(--mono); border: 1px solid var(--line); background: var(--ground); color: var(--ink); border-radius: 999px; padding: 7px 11px; cursor: pointer; }
.ao-pal-foot { display: flex; gap: 16px; flex-wrap: wrap; padding: 10px 16px; border-top: 1px solid var(--line); font: 400 0.75rem/1 var(--mono); color: var(--muted); }
@media (max-width: 560px) { .ao-pal-foot { display: none; } }

/* footer */
.ao-ftr { margin: 80px -16px 0; padding: 40px 16px calc(env(safe-area-inset-bottom, 0px) + 32px); border-top: 1px solid var(--line); background: var(--sunken); }
.ao-ftr-in { max-width: 1180px; margin-inline: auto; display: grid; grid-template-columns: 1.4fr repeat(4, minmax(0, 1fr)); gap: 28px; }
.ao-ftr h4 { margin: 0 0 10px; font: 500 0.72rem/1 var(--mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--ochre); }
.ao-ftr ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.ao-page .ao-ftr a { color: var(--ink); text-decoration: none; font-size: 0.92rem; }
.ao-page .ao-ftr a:hover { text-decoration: underline; }
.ao-ftr p { font-size: 0.9rem; color: var(--muted); max-width: 36ch; }
.ao-ftr-base { max-width: 1180px; margin: 28px auto 0; padding-top: 16px; border-top: 1px solid var(--line); font: 400 0.75rem/1.5 var(--mono); color: var(--muted); display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
@media (max-width: 860px) { .ao-ftr-in { grid-template-columns: repeat(2, minmax(0, 1fr)); } .ao-ftr-in > :first-child { grid-column: 1 / -1; } }

/* toast */
.ao-toast { position: fixed; left: 50%; bottom: calc(env(safe-area-inset-bottom, 0px) + 24px); transform: translateX(-50%); z-index: 90; background: var(--ink); color: var(--ground); font: 500 0.85rem/1 var(--mono); padding: 11px 16px; border-radius: 999px; box-shadow: 0 8px 20px rgba(0,0,0,.25); }

/* breadcrumb */
.ao-crumb { display: flex; flex-wrap: wrap; gap: 6px; font: 500 0.78rem/1.4 var(--mono); color: var(--muted); list-style: none; margin: 0; padding: 0; }
.ao-crumb li + li::before { content: "/"; margin-right: 6px; color: var(--line); }
.ao-page .ao-crumb a { color: var(--muted); text-decoration: none; }
.ao-page .ao-crumb a:hover { color: var(--ink); text-decoration: underline; }

@media (prefers-reduced-motion: reduce) { .ao-hdr { transition: none; } }
@media print { .ao-hdr, .ao-ftr, .ao-skip, .art-bar, .art-progress { display: none !important; } }

/* related guide cards on module pages */
.ao-related { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr)); gap: 14px; }
.ao-page .ao-related a { display: flex; flex-direction: column; gap: 8px; padding: 18px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); color: var(--ink); text-decoration: none; }
.ao-related a:hover { border-color: var(--ink); }
.ao-related strong { font: 750 1.1rem/1.2 var(--display); font-stretch: 108%; text-wrap: balance; }
.ao-related span:last-child { color: var(--muted); font-size: 0.93rem; }