/* ============================================================
   header.css — Sticky Navigation
   ============================================================ */

#site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--nav-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--nav-border);
  transition: background 0.3s ease, box-shadow 0.3s ease;
}

#site-header.scrolled {
  box-shadow: 0 4px 32px rgba(0,0,0,0.25);
}

html.light #site-header.scrolled {
  box-shadow: 0 4px 24px rgba(0,0,0,0.08);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 84px;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--margin-desktop);
}

/* ── Logo ────────────────────────────────────────────────── */
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.nav-logo-text {
  font-family: 'Montserrat', sans-serif;
  font-size: 28px;
  font-weight: 700;
  color: #0066B2;
  letter-spacing: -0.02em;
}

/* ── Center Links ────────────────────────────────────────── */
.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-links a {
  font-family: 'Inter', sans-serif;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.03em;
  color: var(--on-surface-variant);
  padding: 8px 16px;
  border-radius: 8px;
  transition: color 0.2s ease, background 0.2s ease;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--on-surface);
  background: var(--surface-container-high);
}

.nav-links a.active {
  color: var(--secondary-container);
}

html.light .nav-links a.active {
  color: var(--primary-container);
}

/* ── Right Controls ──────────────────────────────────────── */
.nav-controls {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Theme Toggle */
.theme-toggle {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--surface-container-high);
  border: 1px solid var(--outline-variant);
  color: var(--on-surface-variant);
  cursor: pointer;
  transition: all 0.3s ease;
}

.theme-toggle:hover {
  background: var(--surface-variant);
  color: var(--secondary-container);
  border-color: var(--secondary-container);
}

html.light .theme-toggle:hover {
  color: var(--primary-container);
  border-color: var(--primary-container);
}

.theme-toggle .material-symbols-outlined {
  font-size: 20px;
  transition: transform 0.4s ease;
}

/* Contact CTA */
.nav-cta {
  display: inline-flex;
  align-items: center;
  padding: 9px 22px;
  background: var(--secondary-container);
  color: var(--on-secondary-fixed);
  font-size: 14px;
  font-weight: 700;
  border-radius: 50px;
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.3s ease;
  letter-spacing: 0.03em;
}

html.light .nav-cta {
  background: var(--primary-container);
  color: #fff;
}

.nav-cta:hover {
  box-shadow: 0 0 20px var(--glow-primary);
  transform: translateY(-1px);
}

/* ── Mobile Hamburger ────────────────────────────────────── */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 6px;
  background: none;
  border: none;
}

.nav-hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--on-surface);
  border-radius: 2px;
  transition: all 0.3s ease;
}

.nav-hamburger.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; }
.nav-hamburger.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }