/* =====================================================================
   SHARED HEADER for pages that scroll normally (about, gallery).
   Put class="sticky-head" on <body> and use the same markup as about.html:
     <header class="site-header"><h1 id="title">…</h1><ul class="navigation">…</ul></header>
   The header is sticky with a solid background, so content never shows
   through gaps in the nav. Load this after styles.css / nav.css /
   phonestyles.css: it overrides their old fixed-position title and nav
   (phonestyles.css treats anything ≤1380 px wide as a phone, which broke
   1366 px laptops).
   ===================================================================== */

html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }

body.sticky-head {
  height: auto;
  min-height: 100vh;
  min-height: 100dvh;
  overflow-x: hidden;
  overflow-y: auto;
  margin: 0;
  background-color: var(--dark-primary);
  --gutter: max(20px, env(safe-area-inset-left));
}

/* ---------- header: title left, nav right ---------- */

body.sticky-head .site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  box-sizing: border-box;
  width: 100%;
  padding:
    max(14px, env(safe-area-inset-top))
    max(28px, env(safe-area-inset-right))
    12px
    max(28px, env(safe-area-inset-left));
  background-color: var(--dark-primary);
}

body.sticky-head .site-header #title {
  position: static !important;
  top: auto !important;
  left: auto !important;
  width: auto !important;
  margin: 0 !important;
  text-align: left !important;
  white-space: nowrap;
  font-size: clamp(22px, 4.6vh, 42px) !important;
}
body.sticky-head #title a { text-decoration: none; color: inherit; font-weight: inherit; }

body.sticky-head .site-header .navigation {
  position: static !important;
  top: auto !important;
  left: auto !important;
  right: auto !important;
  flex: 0 1 auto;
  margin: 0;
  width: min(56vw, 780px) !important;
  height: clamp(32px, 5.6vh, 52px) !important;
  font-size: clamp(10px, 1.1vw, 16px) !important;
}

.site-header a:focus-visible {
  outline: 2px solid var(--light-primary);
  outline-offset: 3px;
}

/* ---------- phones & portrait tablets ---------- */

@media (max-width: 760px), (orientation: portrait) and (max-width: 1100px) {

  body.sticky-head .site-header {
    flex-direction: column;
    gap: 10px;
    padding:
      max(14px, env(safe-area-inset-top))
      4vw
      10px;
  }

  body.sticky-head .site-header #title {
    text-align: center !important;
    font-size: clamp(20px, 6.2vw, 32px) !important;
  }

  body.sticky-head .site-header .navigation {
    width: 100% !important;
    max-width: 560px;
    height: clamp(26px, 3.8vh, 36px) !important;
    font-size: clamp(9px, 2.7vw, 12.5px) !important;
  }
}