/* ============================================================================
   About page — Sticky in-page Section Nav + mobile polish
   campaigns.healthsites.io  ·  styling only · pure CSS (+ optional JS for
   scrollspy / open-on-jump, see about-section-nav.js)
   Add to theme/css/style.css after the base styles (or @import at the end).

   WHAT THIS DOES
   --------------
   A horizontally-scrollable chip bar that sticks just under the masthead and
   lets readers scan / jump between the 11 About sections. On mobile it scrolls
   sideways with scroll-snap; on desktop it wraps and centres. The active chip
   highlights as you scroll (needs the JS; degrades to a plain jump-nav without).

   REQUIRES
   --------
   • Each section <h2> has a stable id (use Markdown attr_list: `## Our Vision {: #vision }`).
   • --masthead-h set to the real sticky-masthead height so the nav and the
     scroll-offset sit correctly. Campaigns masthead ≈ 72px.
   ============================================================================ */

:root {
  --masthead-h: 72px;          /* height of the existing sticky masthead — TUNE to prod */
  --hs-red: #f44a52;
  --hs-slate: #3c4c57;
  --hs-soft: #f9f9f9;
  --hs-hairline: #f1f0f0;
  --hs-border: #e0e0e0;
}

/* ---- the sticky nav ---------------------------------------------------- */
.section-nav {
  position: sticky;
  top: var(--masthead-h);      /* sits directly beneath the masthead */
  z-index: 900;                /* below masthead (1000), above content */
  background: #fff;
  border-bottom: 1px solid var(--hs-border);
  margin: 0 0 24px;
}
/* subtle shadow once it's doing its sticky job */
.section-nav::after {
  content: "";
  position: absolute; left: 0; right: 0; bottom: -6px; height: 6px;
  background: linear-gradient(to bottom, rgba(0,0,0,0.06), rgba(0,0,0,0));
  pointer-events: none;
}

.section-nav__track {
  display: flex;
  gap: 8px;
  max-width: var(--container-width, 1200px);
  margin: 0 auto;
  padding: 12px 20px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;                 /* Firefox */
}
.section-nav__track::-webkit-scrollbar { display: none; }  /* WebKit */

.section-nav__link {
  flex: 0 0 auto;
  scroll-snap-align: start;
  display: inline-flex;
  align-items: center;
  min-height: 40px;                       /* tap target */
  padding: 8px 16px;
  border-radius: 20px;                    /* brand status-badge radius */
  font-family: 'Raleway', sans-serif;
  font-weight: 600;
  font-size: 14px;
  line-height: 1;
  color: var(--hs-slate);
  background: var(--hs-soft);
  text-decoration: none;
  white-space: nowrap;
  transition: all 0.3s ease;
}
.section-nav__link:hover { background: var(--hs-hairline); opacity: 1; }
.section-nav__link:focus-visible { outline: 2px solid var(--hs-red); outline-offset: 2px; }

/* active = healthsites red (the brand signal). Set by about-section-nav.js;
   also works as the :target fallback for no-JS jump nav. */
.section-nav__link.is-active,
.section-nav__link[aria-current="true"] {
  background: var(--hs-red);
  color: #fff;
}

/* desktop: no sideways scroll — wrap and centre */
@media (min-width: 860px) {
  .section-nav__track { flex-wrap: wrap; justify-content: center; overflow-x: visible; }
}

/* ---- anchor offset: keep the jumped-to heading clear of sticky chrome --- */
.about-content h2[id] {
  scroll-margin-top: calc(var(--masthead-h) + 72px);
}

/* ============================================================================
   MOBILE POLISH for the About accordions (≤640px)
   The page is a stack of <details>/<summary> sections; tighten them for phones.
   ============================================================================ */
.about-content details > summary {
  cursor: pointer;
  min-height: 56px;                       /* comfortable tap target */
  display: flex;
  align-items: center;
  gap: 12px;
}
.about-content details > summary::-webkit-details-marker { display: none; }
/* generated chevron so summaries read as openable on touch */
.about-content details > summary::after {
  content: "";
  flex: none;
  margin-left: auto;
  width: 9px; height: 9px;
  border-right: 2px solid var(--hs-red);
  border-bottom: 2px solid var(--hs-red);
  transform: rotate(45deg);
  transition: transform 0.3s ease;
}
.about-content details[open] > summary::after { transform: rotate(-135deg); }
.about-content details > summary h3 { margin: 0; }

@media (max-width: 640px) {
  .section-nav { margin-bottom: 16px; }
  .section-nav__track { padding: 10px 16px; gap: 6px; }
  .section-nav__link { font-size: 13px; padding: 8px 14px; }
  .about-content h2 { font-size: 22px; }
  .about-content details > summary h3 { font-size: 17px; }
  .about-content details > summary { padding: 14px 0; }
}

/* respect reduced-motion */
@media (prefers-reduced-motion: reduce) {
  .section-nav__link,
  .about-content details > summary::after { transition: none; }
  html { scroll-behavior: auto; }
}

/* smooth native anchor scrolling (no JS, no scrollIntoView) */
@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}