/* ============================================
   NAVIGATION
   ============================================ */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(13, 17, 10, 0.8);
  border-bottom: 1px solid rgba(126, 220, 170, 0.08);
  backdrop-filter: blur(20px) saturate(1.3);
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

.site-header.scrolled {
  background: rgba(13, 17, 10, 0.95);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.4), 0 1px 0 rgba(126, 220, 170, 0.05);
}

.site-header__inner {
  max-width: 1200px;
  margin-inline: auto;
  padding: var(--space-xs) var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* --- Logo --- */
.site-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--step-1);
  letter-spacing: 0.15em;
  color: var(--text);
  transition: color var(--transition-fast);
}
.site-logo:hover {
  color: var(--earth);
}
.site-logo__mark {
  font-size: 1.3em;
  filter: drop-shadow(0 0 8px rgba(126, 220, 170, 0.2));
}

/* --- Nav links --- */
.nav-menu {
  display: flex;
  gap: var(--space-3xs);
  list-style: none;
}

.nav-link {
  display: block;
  padding: 0.4rem 0.8rem;
  font-family: var(--font-display);
  font-size: var(--step--1);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--text-mid);
  border-radius: var(--border-radius-s);
  transition: all var(--transition-fast);
}
.nav-link:hover {
  color: var(--text);
  background: rgba(126, 220, 170, 0.08);
}
.nav-link[aria-current="page"] {
  color: var(--earth);
  background: rgba(126, 220, 170, 0.12);
  box-shadow: 0 0 12px rgba(126, 220, 170, 0.1);
}

/* --- Hamburger --- */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  flex-direction: column;
  gap: 5px;
  z-index: 101;
}
.nav-toggle__bar {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all var(--transition-base);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(300px, 80vw);
    flex-direction: column;
    gap: 0;
    padding: 5rem 2rem 2rem;
    background: rgba(13, 17, 10, 0.98);
    backdrop-filter: blur(30px);
    border-left: 1px solid var(--glass-border);
    transform: translateX(100%);
    transition: transform var(--transition-slow);
    z-index: 100;
  }
  .nav-menu.open {
    transform: translateX(0);
  }

  .nav-link {
    padding: 0.75rem 1rem;
    font-size: var(--step-0);
    border-radius: var(--border-radius-m);
  }
}