/* ===========================================================
   layout.css — page shell, header, footer, consent banner.
   Shared by every page.

   Markup: partials/header.html + partials/footer.html,
   injected by js/site-chrome.js. Edit content there,
   appearance here.

   Breakpoint tiers (use these values in every CSS file;
   media queries can't read CSS variables):
     mobile   < 640px     @media (max-width: 639.98px)
     tablet   640–1079px  @media (min-width: 640px) and (max-width: 1079.98px)
     desktop  ≥ 1080px    @media (min-width: 1080px)
   =========================================================== */

/* ---------- Page shell: header / main / footer ----------
   Every page body is exactly:
     <div id="site-header"></div>
     <main id="main" class="page page--KEY">…</main>
     <div id="site-footer"></div>
   The 1fr row keeps the footer at the bottom on short pages. */
body {
  display: grid;
  grid-template-rows: auto 1fr auto;
  grid-template-columns: minmax(0, 1fr);
  min-height: 100vh;
  min-height: 100dvh;
}
.page { min-width: 0; }
.page:focus { outline: none; }  /* target of the skip link */

/* Reserve header height before the partial arrives (no layout jump). */
#site-header { min-height: var(--header-h); }

/* ---------- Skip link ---------- */
.skip-link {
  position: absolute;
  left: 1rem;
  top: -10rem;
  z-index: 200;
  padding: 0.6rem 1rem;
  background: var(--signal);
  color: var(--ink);
  font-family: var(--font-ui);
  font-size: 0.8rem;
  text-decoration: none;
  border-radius: 6px;
}
.skip-link:focus { top: calc(env(safe-area-inset-top, 0px) + 0.75rem); }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: env(safe-area-inset-top, 0px);
  z-index: 50;
  background: color-mix(in srgb, var(--ink) 88%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

/* ---------- Nav (inside the header) ---------- */
.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: var(--header-h);
  padding: 0 var(--gutter);
  max-width: var(--chrome-max);
  margin: 0 auto;
}

.site-nav__brand {
  font-family: var(--font-ui);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--paper);
  text-decoration: none;
  letter-spacing: 0.01em;
  white-space: nowrap;
}
.site-nav__brand:hover { color: var(--signal); }

.site-nav__links {
  display: flex;
  align-items: center;
  gap: 1.6rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-ui);
  font-size: 0.82rem;
}

.site-nav__links a {
  text-decoration: none;
  color: var(--paper-dim);
  padding-bottom: 3px;
  border-bottom: 1px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.site-nav__links a:hover,
.site-nav__links a[aria-current="page"] {
  color: var(--paper);
  border-color: var(--signal);
}

.site-nav__links .is-disabled {
  color: var(--paper-dim);
  opacity: 0.45;
  cursor: default;
  pointer-events: none;
}

.theme-toggle {
  background: transparent;
  border: 1px solid var(--line);
  color: var(--paper-dim);
  font-family: var(--font-ui);
  font-size: 0.72rem;
  padding: 0.4rem 0.8rem;
  border-radius: 100px;
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease;
  flex-shrink: 0;
}
.theme-toggle:hover { color: var(--paper); border-color: var(--signal); }

.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--line);
  color: var(--paper);
  border-radius: 6px;
  width: 2.2rem;
  height: 2.2rem;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  flex-shrink: 0;
}

/* Mobile tier: links collapse behind the menu button. */
@media (max-width: 639.98px) {
  .site-nav { flex-wrap: wrap; padding-top: 0.85rem; padding-bottom: 0.85rem; }
  .nav-toggle { display: inline-flex; }
  .site-nav__links {
    order: 3;
    width: 100%;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.9rem;
    max-height: 0;
    overflow: hidden;
    margin-top: 0;
    transition: max-height 0.22s ease, margin-top 0.22s ease;
  }
  .site-nav__links.is-open {
    max-height: 20rem;
    margin-top: 1rem;
    padding-bottom: 0.25rem;
  }
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  /* Same content edges as the header at every width. */
  padding: 2.5rem max(var(--gutter), calc((100% - var(--chrome-max)) / 2 + var(--gutter)));
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-family: var(--font-ui);
  font-size: 0.75rem;
  color: var(--paper-dim);
}

.site-footer a {
  color: var(--paper-dim);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: color 0.15s ease, border-color 0.15s ease;
}
.site-footer a:hover { color: var(--paper); border-color: var(--signal); }

.site-footer__links {
  display: flex;
  gap: 1.2rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

/* Mobile tier: footer stacks. */
@media (max-width: 639.98px) {
  .site-footer { flex-direction: column; align-items: flex-start; padding-top: 2rem; padding-bottom: 2rem; }
}

/* ---------- Cookie consent banner ---------- */
.consent-banner {
  position: fixed;
  left: 1rem;
  right: 1rem;
  bottom: 1rem;
  z-index: 100;
  max-width: 34rem;
  margin: 0 auto;
  background: var(--ink);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1.25rem 1.4rem;
  box-shadow: 0 12px 40px rgba(0,0,0,0.25);
  font-family: var(--font-ui);
  font-size: 0.8rem;
  color: var(--paper-dim);
  display: none;
}
.consent-banner.is-visible { display: block; }

.consent-banner p { margin: 0 0 1rem; line-height: 1.6; }
.consent-banner p a { color: var(--paper); }

.consent-banner__actions {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.consent-btn {
  font-family: var(--font-ui);
  font-size: 0.78rem;
  padding: 0.55rem 1rem;
  border-radius: 6px;
  cursor: pointer;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--paper);
}
.consent-btn--primary {
  background: var(--signal);
  border-color: var(--signal);
  color: var(--ink);
  font-weight: 500;
}
.consent-btn:hover { opacity: 0.88; }