/**
 * Shared site header — same horizontal envelope as main content (1280px).
 * Use with: <nav class="site-header site-header--opaque|ghost"> + .site-header__inner
 */
:root {
  --site-header-max: 1280px;
  --site-gutter-x: clamp(20px, 4vw, 40px);
  --site-header-pad-y: 24px;
}

nav.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  transition:
    background 0.35s ease,
    border-color 0.35s ease,
    backdrop-filter 0.35s ease;
}

.site-header__inner {
  max-width: var(--site-header-max);
  margin-left: auto;
  margin-right: auto;
  padding: var(--site-header-pad-y) var(--site-gutter-x);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(12px, 2.5vw, 28px);
  box-sizing: border-box;
  width: 100%;
}

nav.site-header.site-header--opaque {
  background: rgba(240, 237, 232, 0.92);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(14, 14, 14, 0.08);
}

/* Work: transparent until scroll; work index always solid */
nav.site-header.site-header--ghost:not(.scrolled) {
  background: transparent;
  border-bottom: 1px solid transparent;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}

body.mode-list nav.site-header.site-header--ghost,
nav.site-header.site-header--ghost.scrolled {
  background: rgba(240, 237, 232, 0.92);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(14, 14, 14, 0.08);
}

.nav-logo {
  display: inline-flex;
  align-items: center;
  line-height: 0;
  flex-shrink: 0;
}

.nav-logo img {
  height: 34px;
  width: auto;
  max-width: min(200px, 42vw);
  object-fit: contain;
  object-position: left center;
  display: block;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: clamp(20px, 3vw, 36px);
  font-size: 13px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--accent, #ff6b00);
  transition: width 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.nav-cta {
  flex-shrink: 0;
  font-size: 13px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: var(--accent, #ff6b00);
  color: #000;
  border: 1px solid var(--accent, #ff6b00);
  padding: 10px 22px;
  border-radius: 100px;
  transition:
    background 0.25s ease,
    border-color 0.25s ease,
    color 0.25s ease;
  white-space: nowrap;
}

.nav-cta:hover {
  background: var(--accent, #ff6b00);
  border-color: var(--accent, #ff6b00);
  color: #000;
}

.nav-cta.active {
  background: var(--accent, #ff6b00);
  border-color: var(--accent, #ff6b00);
  color: #000;
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  flex-shrink: 0;
  padding: 10px;
  margin: -10px -10px -10px 0;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 1px;
  background: var(--fg, #0e0e0e);
}

#mobile-menu {
  position: fixed;
  inset: 0;
  background: var(--bg, #f0ede8);
  z-index: 90;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 32px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease;
}

#mobile-menu.open {
  opacity: 1;
  pointer-events: all;
}

#mobile-menu a {
  font-family: var(--serif, 'Instrument Serif', serif);
  font-size: clamp(32px, 8vw, 56px);
}

@media (max-width: 768px) {
  :root {
    --site-header-pad-y: 18px;
    --site-gutter-x: 20px;
  }

  .site-header__inner .nav-links,
  .site-header__inner > .nav-cta {
    display: none;
  }

  .hamburger {
    display: flex;
  }
}