/* ============================================================
   HEADER / NAV COMPONENT
   Sticky, blurred, responsive navigation bar
   ============================================================ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--nav-bg);
  border-bottom: 1px solid var(--nav-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: background-color 0.4s ease, border-color 0.4s ease;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

/* ── Logo ──────────────────────────────────────────────── */
.header-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--color-heading);
  letter-spacing: -0.02em;
  transition: color 0.3s ease;
}

.header-logo:hover {
  color: var(--color-primary);
}

.logo-mark {
  width: 32px;
  height: 32px;
  background-color: var(--color-primary);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  font-weight: 900;
  color: var(--color-btn-text);
  flex-shrink: 0;
  transition: background-color 0.3s ease;
}

/* ── Nav links ─────────────────────────────────────────── */
.header-nav {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.header-nav a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color 0.2s ease;
  position: relative;
}

.header-nav a::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-primary);
  transition: width 0.2s ease;
  border-radius: 2px;
}

.header-nav a:hover {
  color: var(--color-heading);
}

.header-nav a:hover::after {
  width: 100%;
}

/* ── CTA group ─────────────────────────────────────────── */
.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.header-actions .btn {
  padding: 0.55rem 1.25rem;
  font-size: 0.875rem;
}

/* ── Mobile toggle ─────────────────────────────────────── */
.mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 0.5rem;
  border: none;
  background: none;
}

.mobile-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 2px;
  transition: all 0.3s ease;
}

/* ── Mobile menu ───────────────────────────────────────── */
.mobile-menu {
  display: none;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--color-border);
  padding: 1rem 0;
  background-color: var(--nav-bg);
}

.mobile-menu a {
  padding: 0.75rem 1.5rem;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text);
  transition: color 0.2s ease, background-color 0.2s ease;
}

.mobile-menu a:hover {
  color: var(--color-primary);
  background-color: var(--color-primary-soft);
}

.mobile-menu .mobile-menu-actions {
  display: flex;
  gap: 0.75rem;
  padding: 1rem 1.5rem 0;
  border-top: 1px solid var(--color-border);
  margin-top: 0.5rem;
}

/* ── Responsive ─────────────────────────────────────────── */
@media (max-width: 768px) {
  .header-nav,
  .header-actions {
    display: none;
  }

  .mobile-toggle {
    display: flex;
  }

  .mobile-menu.is-open {
    display: flex;
  }
}