/* Marchenholm — header.css : masthead, wordmark, navigation. */

.mh-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--c-paper);
  border-top: 2px solid var(--c-accent);
  border-bottom: 1px solid var(--c-ink);
  transition: height 0.2s, padding 0.2s;
}

.mh-header__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 16px var(--gutter);
  display: flex;
  align-items: center;
  gap: var(--space-item);
  min-height: 64px;
}

/* Wordmark */
.mh-wordmark {
  font-family: var(--f-display);
  font-weight: 900;
  font-size: 2rem;
  line-height: 1;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--c-ink);
  text-decoration: underline;
  text-decoration-color: var(--c-accent);
  text-decoration-thickness: 2px;
  text-underline-offset: 6px;
  white-space: nowrap;
}
.mh-wordmark:hover { color: var(--c-accent); }

.mh-header__brand {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.mh-sub-wordmark {
  font-family: var(--f-mono);
  font-size: var(--f-label);
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-stone);
  margin-top: 10px;
}

/* Nav */
.mh-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: var(--space-item);
}
.mh-nav a {
  font-family: var(--f-body);
  font-weight: 500;
  font-size: var(--f-body-s);
  color: var(--c-ink);
  letter-spacing: 0.04em;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: color 0.15s, border-color 0.15s;
}
.mh-nav a:hover,
.mh-nav a[aria-current="page"] {
  color: var(--c-accent);
  border-bottom-color: var(--c-accent);
}

/* Hamburger (mobile) — 44x44 tap target (iOS guideline) */
.mh-nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--c-ink);
  width: 44px;
  height: 44px;
  border-radius: var(--r-sm);
  cursor: pointer;
  align-items: center;
  justify-content: center;
  margin-left: auto;
  padding: 0;
  transition: border-color 0.15s;
}
.mh-nav-toggle:hover { border-color: var(--c-accent); }
.mh-nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--c-ink);
  position: relative;
  transition: background 0.15s;
}
.mh-nav-toggle span::before,
.mh-nav-toggle span::after {
  content: '';
  position: absolute;
  left: 0;
  width: 20px;
  height: 2px;
  background: var(--c-ink);
  transition: transform 0.2s, top 0.2s;
}
.mh-nav-toggle span::before { top: -6px; }
.mh-nav-toggle span::after  { top: 6px; }
/* Hamburger → X when open */
.mh-nav-toggle--open span { background: transparent; }
.mh-nav-toggle--open span::before { top: 0; transform: rotate(45deg); }
.mh-nav-toggle--open span::after  { top: 0; transform: rotate(-45deg); }

/* Shrink state (added by theme.js on scroll > 80px on desktop) */
.mh-header--shrunk .mh-header__inner { min-height: 48px; padding: 8px var(--gutter); }
.mh-header--shrunk .mh-sub-wordmark { display: none; }
.mh-header--shrunk { border-top-width: 0; }