/* ═══════════════════════════════════════════
   NAVIGATION
═══════════════════════════════════════════ */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 5vw;
  transition: background var(--transition), backdrop-filter var(--transition);
}
nav.scrolled {
  background: rgba(7,7,10,0.88);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.nav-logo {
  font-family: 'Cormorant Garamond', serif;
  font-size: 1.4rem;
  font-weight: 300;
  color: var(--white);
  text-decoration: none;
  letter-spacing: 0.04em;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease;
}
.nav-logo.visible { opacity: 1; pointer-events: all; }

.lang-switch { display: flex; align-items: center; gap: 0.5rem; }
.lang-switch--mobile { margin-top: 2rem; justify-content: center; gap: 1rem; }
.lang-flag {
  display: flex;
  width: 26px; height: 26px;
  border-radius: 50%;
  overflow: hidden;
  opacity: 0.4;
  transition: opacity var(--transition), transform var(--transition);
  line-height: 0;
}
.lang-flag svg { width: 100%; height: 100%; }
.lang-flag:hover { opacity: 0.75; transform: translateY(-1px); }
.lang-flag.active { opacity: 1; box-shadow: 0 0 0 2px var(--gold-dim); }
.nav-phd {
  font-family: 'Cormorant Garamond', serif;
  font-size: 0.9rem;
  font-style: italic;
  font-weight: 300;
  color: var(--gold);
  letter-spacing: 0.08em;
  margin-left: 0.5em;
  vertical-align: baseline;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: clamp(1.2rem, 2vw, 2.4rem);
  list-style: none;
}
.nav-links a {
  font-size: 0.78rem;
  font-weight: 400;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  text-decoration: none;
  position: relative;
  transition: color var(--transition);
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0;
  width: 0; height: 1px;
  background: var(--gold);
  transition: width var(--transition);
}
.nav-links a:hover, .nav-links a.active { color: var(--gold-light); }
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }

.nav-cta {
  border: 1px solid var(--gold-dim);
  padding: 0.45rem 1.2rem;
  border-radius: 2px;
  color: var(--gold) !important;
  transition: background var(--transition), color var(--transition) !important;
}
.nav-cta:hover { background: var(--gold) !important; color: var(--bg) !important; }
.nav-cta::after { display: none !important; }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  background: none;
  border: none;
}
.hamburger span {
  display: block;
  width: 24px; height: 1px;
  background: var(--gold);
  transition: var(--transition);
}
.hamburger.open span:nth-child(1) { transform: rotate(45deg) translate(4px, 4px); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: rotate(-45deg) translate(4px, -4px); }

/* Mobile nav */
.mobile-nav {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--bg);
  z-index: 999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2.5rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}
.mobile-nav.open { opacity: 1; pointer-events: all; display: flex; }
.mobile-nav a {
  font-family: 'Cormorant Garamond', serif;
  font-size: 2.2rem;
  font-weight: 300;
  color: var(--text-muted);
  text-decoration: none;
  letter-spacing: 0.05em;
  transition: color var(--transition);
}
.mobile-nav a:hover { color: var(--gold-light); }