/* ============================================================
   Site chrome v2 — top bar, centered sheet, column layout.
   Loads after _shared.css (tokens, girih ground, toggles, flags).
   Logical properties throughout; no left/right anywhere.
   ============================================================ */

:root {
  --font-display: "Readex Pro", system-ui, sans-serif;
  --font-text: "IBM Plex Sans Arabic", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;
  --tile: 300px;
  --sheet: 76rem;
}
html[lang="ar"] { --font-mono: "IBM Plex Sans Arabic", system-ui, sans-serif; }
html { scroll-behavior: smooth; }
body { font-family: var(--font-text); }

:root[data-theme="light"] { --stone-light: #C9BFA8; --stone-dark: #8A7E63; --ablaq-op: .16; }
:root[data-theme="dark"]  { --stone-light: #2A2A26; --stone-dark: #C6AE7D; --ablaq-op: .05; }

/* ---------- ground (unchanged from the settled design) ---------- */
.ablaq {
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  -webkit-mask-repeat: repeat; mask-repeat: repeat;
  -webkit-mask-size: var(--tile) var(--tile); mask-size: var(--tile) var(--tile);
}
.ablaq--a { background: var(--stone-light); opacity: var(--ablaq-op);
  -webkit-mask-image: url(./girih-ablaq-a.svg); mask-image: url(./girih-ablaq-a.svg); }
.ablaq--b { background: var(--stone-dark); opacity: var(--ablaq-op);
  -webkit-mask-image: url(./girih-ablaq-b.svg); mask-image: url(./girih-ablaq-b.svg); }
.ground { background: var(--pattern); opacity: var(--pattern-op);
  -webkit-mask-image: url(./girih-strap.svg); mask-image: url(./girih-strap.svg); }
.ground__reveal > i { background: var(--accent);
  -webkit-mask-image: url(./girih-underlay.svg); mask-image: url(./girih-underlay.svg); }
.ground__reveal { --r: 260px; opacity: 0; transition: opacity .45s ease; }
:root[data-reveal="on"] .ground__reveal { opacity: .85; }

/* ---------- top bar ---------- */
.topbar {
  position: sticky; inset-block-start: 0; z-index: 10;
  display: flex; align-items: center; gap: var(--sp-3) var(--sp-4);
  flex-wrap: wrap;
  padding: .65rem var(--sp-4);
  background: color-mix(in srgb, var(--canvas) 88%, transparent);
  -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px);
  border-block-end: 1px solid var(--rule);
}
.lockup { text-decoration: none; display: flex; gap: .6rem; align-items: center; }
.mark {
  inline-size: 1.7rem; block-size: 1.7rem; flex: none;
  background: url(./logo-badge.svg) center / contain no-repeat;
}
.lockup .latin { display: block; font-family: var(--font-display);
  font-size: var(--step-0); font-weight: 500; line-height: 1.1;
  letter-spacing: -.015em; color: var(--ink-strong); }
.lockup .arabic { display: block; font-size: var(--step--1); line-height: 1.3;
  color: var(--gold); }

.topbar nav { display: flex; align-items: center; gap: var(--sp-3);
  margin-inline-start: auto; flex-wrap: wrap; }
.topbar nav a { font-size: var(--step--1); text-decoration: none;
  color: var(--ink-muted); padding: .2rem 0; transition: color .16s; }
.topbar nav a:hover { color: var(--ink-strong); }
.topbar nav a[aria-current] { color: var(--accent-ink); }
.topbar .toggles { margin-inline-start: var(--sp-2); }
.sr-only {
  position: absolute; inline-size: 1px; block-size: 1px;
  overflow: hidden; clip-path: inset(50%); white-space: nowrap;
}
.toggle[hidden] { display: none; }
.toggle--icon { padding: .3rem .5rem; font-size: 1rem; line-height: 1; }
.theme-icon::before { content: "\263E\FE0E"; }
:root[data-theme="dark"] .theme-icon::before { content: "\2600\FE0E"; }
.btn-resume {
  font-size: var(--step--1); text-decoration: none; line-height: 1;
  padding: .45rem .8rem; border-radius: 2px;
  color: var(--surface); background: var(--accent);
  border: 1px solid var(--accent);
  transition: opacity .16s;
}
.btn-resume:hover { opacity: .88; }
:root[data-theme="dark"] .btn-resume { color: #10211D; }

/* ---------- sheet: a column of floating section cards on the desk ---------- */
.sheet {
  max-inline-size: var(--sheet);
  margin-inline: auto;
  margin-block: var(--sp-5) var(--sp-5);
  padding-inline: var(--sp-3);
}
section { scroll-margin-block-start: 5rem; }
.sheet > section {
  background: color-mix(in srgb, var(--surface) 96%, transparent);
  border: 1px solid var(--rule);
  border-radius: 4px;
  box-shadow: var(--shadow);
  padding: var(--sp-5) clamp(var(--sp-4), 4vw, var(--sp-5));
  transition: translate .25s ease, box-shadow .25s ease;
}
@media (hover: hover) {
  .sheet > section:hover {
    translate: 0 -4px;
    box-shadow: 0 2px 4px rgba(0,0,0,.10), 0 26px 56px rgba(0,0,0,.18);
  }
}
.sheet > section + section { margin-block-start: var(--sp-4); }

.head { display: flex; align-items: baseline; gap: var(--sp-3); margin: 0 0 var(--sp-4); }
.head h2 { font-family: var(--font-display); font-size: var(--step-1); font-weight: 500;
  margin: 0; color: var(--ink-strong); white-space: nowrap; }
.head::after { content: ""; flex: 1; block-size: 1px; background: var(--rule); }

/* ---------- section arrows: floating prev/next ---------- */
.secnav {
  position: fixed; inset-block-end: var(--sp-4); inset-inline-end: var(--sp-4);
  display: flex; flex-direction: column; gap: .4rem; z-index: 9;
}
.secnav button {
  inline-size: 2.4rem; block-size: 2.4rem;
  display: grid; place-items: center;
  font-size: 1rem; line-height: 1;
  color: var(--ink); background: color-mix(in srgb, var(--surface) 92%, transparent);
  border: 1px solid var(--rule); border-radius: 2px;
  box-shadow: var(--shadow);
  transition: color .16s, border-color .16s;
}
.secnav button:hover { color: var(--accent-ink); border-color: var(--accent-ink); }
.secnav button[disabled] { opacity: .35; pointer-events: none; }
@media (max-width: 46rem) { .secnav { display: none; } }

/* ---------- footer ---------- */
.foot {
  max-inline-size: var(--sheet); margin-inline: auto;
  padding: 0 var(--sp-4) var(--sp-6);
  display: flex; flex-wrap: wrap; gap: var(--sp-2) var(--sp-4);
  align-items: baseline;
  font-size: var(--step--1); color: var(--ink-muted);
}
.foot a { color: var(--accent-ink); text-underline-offset: .2em; }
.hours { font-family: var(--font-mono); margin: 0; }
.hours b { color: var(--ink-strong); font-weight: 500; }

/* ---------- mobile ---------- */
@media (max-width: 62rem) {
  .sheet { margin-block-start: var(--sp-3); }
}
@media (max-width: 46rem) {
  .topbar { padding: .5rem var(--sp-3); gap: var(--sp-2) var(--sp-3); }
  .topbar nav { gap: var(--sp-2) var(--sp-3); }
  .lockup .arabic { display: none; }
  .sheet { margin-block: var(--sp-2); padding-inline: var(--sp-2); }
  .sheet > section { padding: var(--sp-4) var(--sp-3); }
}