/* ====================================================================
   Site nav / header
   ==================================================================== */

.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(250, 248, 245, 0.92);
  backdrop-filter: saturate(140%) blur(10px);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--color-border);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
  height: var(--nav-height);
  max-width: var(--container-lg);
  margin: 0 auto;
  padding-inline: var(--space-lg);
}

.logo {
  display: inline-flex;
  align-items: center;
  transition: opacity var(--duration-fast);
  flex-shrink: 0;
  line-height: 0;
}
.logo:hover { opacity: 0.75; }

.logo picture {
  display: inline-block;
  line-height: 0;
}
.logo img {
  display: block;
  height: 42px;
  width: auto;
  max-width: 180px;
}
@media (max-width: 560px) {
  .logo img { height: 36px; max-width: 150px; }
}

/* ---------- Desktop menu (centered) ---------- */
.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
  margin-inline: auto;
}

.nav-menu a {
  font-family: var(--font-sans);
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--color-text);
  padding: 8px 0;
  position: relative;
  transition: color var(--duration-fast);
}
.nav-menu a::after {
  content: "";
  position: absolute;
  bottom: 4px;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform var(--duration-base) var(--ease-out);
}
.nav-menu a:hover,
.nav-menu a[aria-current="page"] {
  color: var(--color-accent-ink);
}
.nav-menu a:hover::after,
.nav-menu a[aria-current="page"]::after {
  transform: scaleX(1);
}

/* ---------- Nav actions (search) ---------- */
.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-shrink: 0;
}
.nav-search {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  color: var(--color-text-muted);
  border-radius: var(--radius-full);
  transition: background var(--duration-fast),
              color var(--duration-fast);
}
.nav-search:hover {
  background: var(--color-accent-soft);
  color: var(--color-accent-ink);
}
.nav-search svg {
  width: 18px;
  height: 18px;
  display: block;
}

/* ---------- Hamburger (mobile) ---------- */
.nav-hamburger {
  display: none;
  width: 40px;
  height: 40px;
  padding: 10px;
  position: relative;
  cursor: pointer;
}

.nav-hamburger span {
  display: block;
  width: 20px;
  height: 1.5px;
  background: var(--color-text);
  margin: 4px auto;
  transition: transform var(--duration-base) var(--ease-out),
              opacity var(--duration-fast);
}

.nav-hamburger[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(5.5px) rotate(45deg);
}
.nav-hamburger[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.nav-hamburger[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-5.5px) rotate(-45deg);
}

/* ---------- Mobile fullscreen overlay ---------- */
@media (max-width: 860px) {
  .nav-menu { margin-inline: 0; }
  .nav-hamburger { display: block; }

  .nav-menu {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    bottom: 0;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    background: var(--color-bg);
    padding: var(--space-2xl) var(--space-xl);
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--duration-base) var(--ease-out),
                padding var(--duration-base) var(--ease-out);
  }
  .nav-menu a {
    padding: var(--space-lg) 0;
    font-family: var(--font-display);
    font-size: var(--fs-2xl);
    font-weight: 500;
    color: var(--color-text);
    border-bottom: 1px solid var(--color-border-soft);
    letter-spacing: -0.01em;
  }
  .nav-menu a::after {
    display: none;
  }
  .nav-menu a:last-child {
    border-bottom: 0;
  }
  .nav-menu a[aria-current="page"] {
    color: var(--color-accent-ink);
  }

  .site-nav[data-menu-open="true"] .nav-menu {
    max-height: calc(100vh - var(--nav-height));
  }
  .site-nav[data-menu-open="true"] {
    background: var(--color-bg);
  }

  .nav-actions {
    /* Keep search icon visible on mobile next to hamburger */
  }
}