/* ==========================================================================
   HEADER + PRIMARY NAVIGATION
   Mobile/tablet (< 1024px): logo + menu button; full-screen menu panel.
   Desktop (>= 1024px): logo · centered links · "Request an Evaluation".
   The header is fixed. At the top of the page it is transparent on desktop
   (sits over the hero photo, as in the approved mockup); after scrolling it
   gets a soft ivory background so navigation stays readable.
   ========================================================================== */

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  background-color: var(--color-ivory);
  transition:
    background-color var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}

.site-header[data-scrolled] { box-shadow: 0 1px 0 rgba(32, 32, 31, 0.08); }

.site-header__inner {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  height: var(--header-h);
}

/* ---------- Logo ---------- */
.site-header__brand {
  display: inline-flex;
  flex: none;
  margin-right: auto;
  border-radius: 2px;
}

.site-header__brand img {
  width: 8.5rem;                     /* 136px on phones */
  height: auto;
}

/* ---------- Header CTA (desktop only) ---------- */
.site-header__cta { display: none; }

/* ---------- Menu button (hamburger) ---------- */
.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;                    /* 44px touch target */
  height: 2.75rem;
  margin-right: -0.625rem;
  padding: 0;
  border: 0;
  border-radius: 999px;
  background: transparent;
  cursor: pointer;
}

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 1.375rem;
  height: 0.875rem;
}

.nav-toggle__bars span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 1.5px;
  border-radius: 1px;
  background-color: var(--color-charcoal);
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease), top var(--dur) var(--ease);
}

.nav-toggle__bars span:nth-child(1) { top: 0; }
.nav-toggle__bars span:nth-child(2) { top: calc(50% - 0.75px); }
.nav-toggle__bars span:nth-child(3) { top: calc(100% - 1.5px); }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1) { top: calc(50% - 0.75px); transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3) { top: calc(50% - 0.75px); transform: rotate(-45deg); }

/* ---------- Mobile/tablet menu panel ---------- */
.site-nav {
  display: none;                     /* hidden until the menu button opens it */
}

.site-header[data-menu-open] .site-nav {
  position: fixed;
  inset: var(--header-h) 0 0 0;
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
  padding: 1.5rem var(--gutter) 2.5rem;
  overflow-y: auto;
  background-color: var(--color-ivory);
  border-top: 1px solid rgba(167, 131, 92, 0.25);
}

.site-nav__list {
  display: flex;
  flex-direction: column;
}

.site-nav__list li + li { border-top: 1px solid rgba(167, 131, 92, 0.2); }

.site-nav__link {
  display: block;
  padding: 1rem 0;
  font-family: var(--font-serif);
  font-size: 1.75rem;
  line-height: 1.2;
  color: var(--color-charcoal);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.site-nav__link:hover { color: var(--color-bronze-ink); }

.site-nav__cta { align-self: stretch; }

/* Prevent the page behind the open menu from scrolling */
html.is-menu-open { overflow: hidden; }

/* ==========================================================================
   DESKTOP (>= 1024px)
   ========================================================================== */
@media (min-width: 64em) {
  :root { --header-h: 6.5rem; }

  /* Transparent over the hero at the top of the page */
  .site-header { background-color: transparent; }

  .site-header[data-scrolled] {
    --header-h: 5rem;
    background-color: var(--color-ivory);
    box-shadow: 0 1px 0 rgba(32, 32, 31, 0.06), 0 8px 24px -16px rgba(32, 32, 31, 0.18);
  }

  .site-header__inner {
    transition: height var(--dur) var(--ease);
  }

  .site-header__brand img {
    width: 11.875rem;                /* 190px, as in the approved mockup */
    transition: width var(--dur) var(--ease);
  }

  .site-header[data-scrolled] .site-header__brand img { width: 10rem; }

  .nav-toggle { display: none; }

  /* Inline navigation. As in the approved mockup it sits left of center,
     so the links stay over the bright hallway and clear of the portrait. */
  .site-header__brand { margin-right: 0; }

  .site-nav,
  .site-header[data-menu-open] .site-nav {
    position: static;
    display: block;
    margin-left: clamp(3rem, 10vw - 2rem, 12rem);
    margin-right: auto;
    padding: 0;
    overflow: visible;
    background: none;
    border: 0;
  }

  .site-nav__list {
    flex-direction: row;
    align-items: center;
    gap: clamp(1.25rem, 1.6vw, 1.75rem);
  }

  .site-nav__list li + li { border-top: 0; }

  .site-nav__link {
    position: relative;
    padding: 0.5rem 0;
    font-family: var(--font-sans);
    font-size: 0.8125rem;
    font-weight: 500;
    letter-spacing: 0.01em;
    white-space: nowrap;
  }

  /* Subtle bronze underline on hover */
  .site-nav__link::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0.2rem;
    height: 1px;
    background-color: var(--color-bronze);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--dur) var(--ease);
  }

  .site-nav__link:hover { color: var(--color-charcoal); }
  .site-nav__link:hover::after { transform: scaleX(1); }

  .site-nav__cta { display: none; }

  .site-header__cta { display: inline-flex; }

  html.is-menu-open { overflow: auto; }
}

/* Mid-size desktops: solid header bar (see hero.css) and everything on one line */
@media (min-width: 64em) and (max-width: 74.99em) {
  .site-header {
    background-color: var(--color-ivory);
    box-shadow: 0 1px 0 rgba(32, 32, 31, 0.06);
  }

  .site-header__brand img { width: 10rem; }
  .site-nav__list { gap: 1.25rem; }
  .site-header__cta { padding-inline: 1.1rem; gap: 0.85rem; }
}