/* ==========================================================================
   LAYOUT: site header, navigation, and footer (shared by every page)
   ========================================================================== */

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-h);
  background: var(--color-bg);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur-base) var(--ease-out);
}
.site-header.is-scrolled,
.site-header.is-open { border-bottom-color: var(--color-line); }

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  width: 100%;                          /* the top bar spans the full screen... */
  max-width: none;
  margin-inline: 0;
  padding-inline: var(--gutter-edge);   /* ...with the logo and links close to the edges */
}

.site-logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-display);
  font-size: var(--step-1);
  font-weight: 600;
  letter-spacing: var(--track-display);
  color: var(--color-ink);
  text-decoration: none;
}
.site-logo:hover { text-decoration: none; color: var(--color-accent); }
.site-logo__mark { flex: none; width: 40px; height: 40px; border-radius: 50%; }

/* Menu button (phone only) */
.menu-button {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background: none;
  border: 1px solid var(--color-line);
  border-radius: 999px;
  cursor: pointer;
  font-size: var(--step--1);
  font-weight: 500;
}
.menu-button__bars,
.menu-button__bars::before {
  display: block;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: transform var(--dur-base) var(--ease-out);
}
.menu-button__bars { position: relative; transform: translateY(-3px); }
.menu-button__bars::before { content: ""; position: absolute; top: 6px; left: 0; }
.site-header.is-open .menu-button__bars { transform: translateY(0) rotate(45deg); }
.site-header.is-open .menu-button__bars::before { top: 0; transform: rotate(-90deg); }

/* Navigation: full-screen panel on phones */
.site-nav {
  position: fixed;
  inset: var(--header-h) 0 0 0;
  padding: var(--space-6) var(--gutter);
  background: var(--color-bg);
  overflow-y: auto;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--dur-base) var(--ease-out), visibility 0s linear var(--dur-base);
}
.site-header.is-open .site-nav {
  opacity: 1;
  visibility: visible;
  transition-delay: 0s;
}
.site-nav ul { list-style: none; margin: 0; padding: 0; }
.site-nav li { border-top: 1px solid var(--color-line); }
.site-nav li:last-child { border-bottom: 1px solid var(--color-line); }
.site-nav a {
  display: block;
  padding: var(--space-4) 0;
  font-family: var(--font-display);
  font-size: var(--step-4);
  letter-spacing: var(--track-display);
  color: var(--color-ink);
  text-decoration: none;
}
.site-nav a:hover { color: var(--color-accent); }
.site-nav a[aria-current="page"] { color: var(--color-accent); }

html.nav-open { overflow: hidden; }

@media (max-width: 809px) {
  .site-header__inner { padding-inline: var(--gutter); }
}

/* Tablet and desktop: inline links */
@media (min-width: 810px) {
  .menu-button { display: none; }
  .site-nav {
    position: static;
    padding: 0;
    overflow: visible;
    opacity: 1;
    visibility: visible;
    background: none;
    transition: none;
  }
  .site-nav ul { display: flex; gap: var(--space-6); }
  .site-nav li,
  .site-nav li:last-child { border: 0; }
  .site-nav a {
    padding: var(--space-1) 0;
    font-family: var(--font-body);
    font-size: var(--step-0);
    font-weight: 500;
    letter-spacing: 0;
    text-decoration: underline;
    text-decoration-color: transparent;
    text-decoration-thickness: 2px;
    text-underline-offset: 0.35em;
    transition: text-decoration-color var(--dur-fast) linear;
  }
  .site-nav a:hover,
  .site-nav a[aria-current="page"] { text-decoration-color: var(--color-accent); color: var(--color-ink); }
}

/* ---------- Footer ---------- */
.site-footer {
  padding-block: var(--space-section) var(--space-6);
  border-top: 1px solid var(--color-line);
}
.site-footer__cta { --stack: var(--space-5); }
.site-footer__cta h2 { font-size: var(--step-3); }
.site-footer__mail {
  display: inline-block;
  font-family: var(--font-display);
  font-size: var(--step-5);
  font-weight: 500;
  letter-spacing: var(--track-display);
  line-height: 1.1;
  overflow-wrap: anywhere;
}

.site-footer__cols {
  display: grid;
  gap: var(--space-6);
  margin-top: var(--space-9);
}
.site-footer__cols h3 { font-family: var(--font-body); font-size: var(--step--1); font-weight: 600; color: var(--color-muted); margin-bottom: var(--space-3); letter-spacing: 0; }
.site-footer__cols ul { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--space-2); }
.site-footer__cols a { color: var(--color-ink); }
.site-footer__cols a:hover { color: var(--color-accent); }

.site-footer__base {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-3);
  margin-top: var(--space-8);
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-line);
  font-size: var(--step--1);
  color: var(--color-muted);
}
.site-footer__base a { color: var(--color-muted); }

@media (min-width: 810px) {
  .site-footer__cols { grid-template-columns: repeat(2, minmax(0, 12rem)); gap: var(--space-8); }
}