/* =========================================================
   SITE HEADER
   ========================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background: rgba(250, 250, 245, 0.95);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.header-inner {
  max-width: var(--content-max);
  margin: 0 auto;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-8);
  gap: var(--space-6);
}

/* Logo */
.site-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  border-bottom: none;
  flex-shrink: 0;
}
.site-logo:hover { border-bottom: none; }
.site-logo svg { width: 36px; height: 36px; flex-shrink: 0; }
.site-logo-text {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-elm);
  line-height: 1.2;
  display: flex;
  flex-direction: column;
}
.site-logo-text span:first-child { font-size: 0.7rem; color: var(--color-olive); font-weight: 500; letter-spacing: 0.05em; text-transform: uppercase; }

/* Nav */
.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-bark-mid);
  text-decoration: none;
  border-bottom: none;
  transition: background var(--transition-fast), color var(--transition-fast);
  white-space: nowrap;
}
.nav-link:hover {
  background: var(--color-highlight);
  color: var(--color-elm);
  border-bottom: none;
}
.nav-link.active {
  background: var(--color-highlight-strong);
  color: var(--color-elm);
  font-weight: 600;
}
.nav-link svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  opacity: 0.85;
}
.nav-link.active svg { opacity: 1; }

/* Hamburger */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  border-radius: var(--radius-md);
  color: var(--color-elm);
  transition: background var(--transition-fast);
}
.nav-toggle:hover { background: var(--color-highlight); }
.nav-toggle svg { width: 24px; height: 24px; display: block; }

@media (max-width: 900px) {
  .header-inner { padding: 0 var(--space-4); }
  .nav-link .nav-label { display: none; }
  .nav-link { padding: var(--space-2); border-radius: var(--radius-md); }
}

@media (max-width: 640px) {
  .nav-toggle { display: flex; }
  .site-nav {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--color-parchment);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-4);
    gap: var(--space-2);
    box-shadow: var(--shadow-md);
  }
  .site-nav.is-open { display: flex; }
  .nav-link { width: 100%; padding: var(--space-3) var(--space-4); }
  .nav-link .nav-label { display: inline; }
}