/* ==========================================================================
   Header / navigation
   ========================================================================== */

.site-header {
  position: relative;
  z-index: 20;
  background: var(--white);
}

.site-header__inner {
  display: flex;
  align-items: center;
  height: var(--header-h);
  gap: 24px;
}

/* ---- Logo ---- */
.logo {
  display: block;
  flex: none;
  margin-right: auto;
  text-decoration: none;
}
.logo__mark {
  width: calc(170 * var(--u));
  min-width: 104px;
  height: auto;
}
.logo__red { stroke: var(--mas-red); }
.logo__ink { stroke: var(--ink); }
.logo__dot { fill: var(--mas-red); }

/* ---- Primary nav ---- */
.nav ul {
  display: flex;
  gap: calc(36 * var(--u));
}

.nav a {
  position: relative;
  display: block;
  padding: 10px 2px;
  color: var(--ink);
  font-size: 10.5px;
  font-weight: 500;
  font-stretch: 100%;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  text-decoration: none;
}

/* Short MAS-red dash: active marker, previewed on hover */
.nav a::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -2px;
  width: 14px;
  height: 2px;
  margin-left: -7px;
  background: var(--mas-red);
  transform: scaleX(0);
  transition: transform var(--dur-ui) var(--ease-mech);
}
.nav a[aria-current="page"]::after,
.nav a:hover::after { transform: scaleX(1); }
.nav a:not([aria-current]):hover::after { opacity: 0.4; }

.site-header__cta {
  flex: none;
  margin-left: calc(16 * var(--u));
  min-height: 42px;
  padding: 0 14px;
  font-size: 10.5px;
}

/* ---- Menu toggle (mobile only, JS-enhanced) ---- */
.nav-toggle { display: none; }

@media (prefers-reduced-motion: reduce) {
  .nav a::after { transition: none; }
}

/* ==========================================================================
   < 1024px — compact header
   ========================================================================== */
@media (max-width: 1023.98px) {
  .site-header__inner { gap: 10px; }

  .site-header__cta {
    order: 2;
    margin-left: 0;
    gap: 8px;
    min-height: 36px;
    padding: 0 11px;
    font-size: 9.5px;
    letter-spacing: 0.05em;
  }

  /* No-JS fallback: nav stays visible as a row under the bar. */
  .site-header__inner { flex-wrap: wrap; height: auto; min-height: var(--header-h); }
  .nav { order: 4; width: 100%; padding-bottom: 8px; }
  .nav ul { gap: 20px; }

  /* JS-enhanced disclosure menu */
  .js .site-header__inner { flex-wrap: nowrap; height: var(--header-h); }

  .js .nav-toggle {
    order: 3;
    display: grid;
    place-items: center;
    flex: none;
    width: 40px;
    height: 40px;
    padding: 0;
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    background: var(--white);
    color: var(--ink);
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
  }
  .nav-toggle__bars,
  .nav-toggle__bars::before {
    display: block;
    width: 16px;
    height: 1.5px;
    background: currentColor;
  }
  .nav-toggle__bars { position: relative; transform: translateY(-3px); }
  .nav-toggle__bars::before {
    content: "";
    position: absolute;
    top: 6px;
  }
  .nav-toggle[aria-expanded="true"] .nav-toggle__bars { transform: rotate(45deg); }
  .nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { top: 0; transform: rotate(-90deg); }

  .js .nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    width: auto;
    padding: 8px var(--gutter) 20px;
    background: var(--white);
    border-bottom: 1px solid var(--line);
  }
  .js .nav:not(.is-open) { display: none; }
  .js .nav ul { flex-direction: column; gap: 0; }
  .js .nav a {
    padding: 14px 0;
    border-top: 1px solid var(--line);
    font-size: 13px;
  }
  .js .nav a::after { left: 0; bottom: 8px; margin-left: 0; }
}