/* ── NAVBAR ── */
#navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 48px; height: 64px;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow 0.3s;
}

#navbar.scrolled { box-shadow: 0 2px 20px rgba(0, 87, 168, 0.1); }

.nav-brand {
  font-family: 'Montserrat', sans-serif;
  font-weight: 900; font-size: 20px;
  color: var(--blue-dark); text-decoration: none;
  letter-spacing: -0.01em;
}

.nav-brand span { color: var(--blue-light); }

.nav-links { display: flex; gap: 32px; list-style: none; }

.nav-links a {
  font-size: 13px; font-weight: 600;
  color: var(--gray); text-decoration: none;
  letter-spacing: 0.06em; text-transform: uppercase;
  transition: color 0.2s;
  position: relative;
}

.nav-links a::after {
  content: ''; position: absolute; left: 0; bottom: -4px;
  width: 0; height: 2px; background: var(--blue-light);
  transition: width 0.25s;
}

.nav-links a:hover { color: var(--blue); }
.nav-links a:hover::after { width: 100%; }

/* ── THEME TOGGLE BUTTON ── */
#theme-toggle {
  background: none;
  border: 1.5px solid var(--border);
  border-radius: 50%;
  width: 36px; height: 36px;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  color: var(--gray);
  transition: border-color 0.2s, color 0.2s, background 0.2s;
  flex-shrink: 0;
}

#theme-toggle:hover {
  border-color: var(--blue-light);
  color: var(--blue-light);
  background: var(--blue-pale);
}

#theme-toggle svg { width: 16px; height: 16px; display: block; pointer-events: none; }
.icon-sun { display: none; }

/* ── RESPONSIVE ── */
@media (max-width: 768px) {
  #navbar { padding: 0 24px; }
}