/* ── Header ──────────────────────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  height: var(--header-height);
  background: linear-gradient(135deg, var(--color-navy) 0%, var(--color-navy-mid) 100%);
  box-shadow: 0 2px 20px rgba(15,23,42,0.4);
  border-bottom: 1px solid rgba(56,189,248,0.2);
}

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

/* ── Logo ────────────────────────────────────────────────────────────── */
.site-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  flex-shrink: 0;
  transition: opacity var(--transition-fast);
}

.site-logo:hover { opacity: 0.85; }
.site-logo:hover .logo-text { color: var(--color-sky); text-decoration: none; }

.logo-icon {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
}

.logo-text {
  font-size: var(--text-base);
  font-weight: 700;
  color: white;
  line-height: 1.2;
  letter-spacing: -0.01em;
  transition: color var(--transition-fast);
}

.logo-text span {
  display: block;
  font-size: var(--text-xs);
  font-weight: 400;
  color: var(--color-sky-light);
  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);
  color: var(--color-sky-light);
  text-decoration: none;
  font-size: var(--text-sm);
  font-weight: 500;
  white-space: nowrap;
  transition: background var(--transition-fast), color var(--transition-fast);
  border: 1px solid transparent;
}

.nav-link:hover {
  color: white;
  background: rgba(56,189,248,0.15);
  border-color: rgba(56,189,248,0.3);
  text-decoration: none;
}

.nav-link.active {
  color: white;
  background: rgba(56,189,248,0.2);
  border-color: rgba(56,189,248,0.4);
}

.nav-link .nav-icon {
  font-size: 1.1em;
  line-height: 1;
}

/* ── Mobile menu toggle ──────────────────────────────────────────────── */
.nav-toggle {
  display: none;
  background: none;
  border: 1px solid rgba(56,189,248,0.3);
  border-radius: var(--radius-md);
  padding: var(--space-2);
  cursor: pointer;
  color: var(--color-sky-light);
  flex-direction: column;
  gap: 5px;
  width: 38px;
  height: 38px;
  align-items: center;
  justify-content: center;
  transition: background var(--transition-fast);
}

.nav-toggle:hover { background: rgba(56,189,248,0.15); }

.nav-toggle-bar {
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.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: translateY(-7px) rotate(-45deg); }

/* ── Responsive ──────────────────────────────────────────────────────── */
@media (max-width: 900px) {
  .logo-text span { display: none; }
}

@media (max-width: 768px) {
  .header-inner { padding: 0 var(--space-4); }

  .nav-toggle { display: flex; }

  .site-nav {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-navy);
    border-bottom: 1px solid rgba(56,189,248,0.2);
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-1);
    padding: var(--space-3) var(--space-4);
    box-shadow: 0 8px 20px rgba(15,23,42,0.5);
  }

  .site-nav.open { display: flex; }

  .nav-link { justify-content: flex-start; padding: var(--space-3) var(--space-4); }
}