/* Header layout */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(18px);
  background: radial-gradient(circle at top left, rgba(56, 189, 248, 0.16), transparent 55%),
              radial-gradient(circle at bottom right, rgba(74, 222, 128, 0.12), transparent 55%),
              rgba(15, 23, 42, 0.96);
  border-bottom: 1px solid rgba(148, 163, 184, 0.3);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-3);
  padding-bottom: var(--space-3);
  gap: var(--space-4);
}

/* Brand */
.header-brand {
  display: flex;
  align-items: center;
}

.header-logo-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-heading);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: var(--font-size-sm);
}

.header-logo-mark {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  background: conic-gradient(from 180deg, #4ade80, #22c55e, #38bdf8, #4ade80);
  box-shadow: var(--shadow-glow-primary);
  position: relative;
  overflow: hidden;
}

.header-logo-mark::after {
  content: "";
  position: absolute;
  inset: 6px;
  border-radius: inherit;
  background: radial-gradient(circle at 30% 20%, rgba(15, 23, 42, 0.35), transparent 55%),
              rgba(15, 23, 42, 0.95);
}

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

/* Navigation */
.header-nav {
  margin-left: auto;
}

.header-nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.header-nav-item {
  list-style: none;
}

.header-nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0;
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.header-nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -0.15rem;
  height: 2px;
  border-radius: var(--radius-full);
  background: linear-gradient(90deg, #4ade80, #38bdf8);
  transform-origin: center;
  transform: scaleX(0);
  transition: transform var(--transition-normal);
}

.header-nav-link:hover,
.header-nav-link:focus-visible {
  color: var(--color-text);
}

.header-nav-link:hover::after,
.header-nav-link:focus-visible::after {
  transform: scaleX(1);
}

.header-nav-cta {
  margin-left: var(--space-2);
}

.header-cta-btn {
  font-size: var(--font-size-xs);
  padding-inline: 1.25rem;
}

/* Mobile menu toggle */
.header-menu-toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text);
  border-radius: var(--radius-full);
  padding: 0.35rem 0.75rem;
  border: 1px solid rgba(148, 163, 184, 0.35);
  background-color: rgba(15, 23, 42, 0.8);
  cursor: pointer;
}

.header-menu-toggle-box {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 3px;
}

.header-menu-toggle-line {
  width: 16px;
  height: 2px;
  border-radius: 999px;
  background-color: var(--color-text);
  transition: transform var(--transition-normal), opacity var(--transition-normal), width var(--transition-normal);
}

.header-menu-toggle-text {
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.14em;
}

/* Toggle animation when menu is open */
.site-header.is-menu-open .header-menu-toggle-line:nth-child(1) {
  transform: translateY(4px) rotate(45deg);
}

.site-header.is-menu-open .header-menu-toggle-line:nth-child(2) {
  opacity: 0;
}

.site-header.is-menu-open .header-menu-toggle-line:nth-child(3) {
  transform: translateY(-4px) rotate(-45deg);
  width: 16px;
}

/* Default mobile behaviour: nav hidden until JS toggles class */
@media (max-width: 768px) {
  .header-nav {
    position: absolute;
    inset-inline: 0;
    top: 100%;
    background-color: rgba(15, 23, 42, 0.98);
    border-bottom: 1px solid rgba(148, 163, 184, 0.25);
    transform-origin: top;
    transform: scaleY(0);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition-normal), opacity var(--transition-normal);
  }

  .site-header.is-menu-open .header-nav {
    transform: scaleY(1);
    opacity: 1;
    pointer-events: auto;
  }

  .header-nav-list {
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-4);
    gap: var(--space-3);
  }

  .header-nav-cta {
    width: 100%;
  }

  .header-cta-btn {
    width: 100%;
    justify-content: center;
  }
}

/* Desktop: always show nav, hide burger label text slightly */
@media (min-width: 769px) {
  .header-menu-toggle {
    display: none;
  }
}

/* Fallback when JS is disabled: keep menu visible on mobile */
.no-js .header-nav {
  position: static;
  transform: none !important;
  opacity: 1 !important;
  pointer-events: auto !important;
}

.no-js .header-nav-list {
  flex-direction: row;
  align-items: center;
  padding: 0;
}

.no-js .header-menu-toggle {
  display: none;
}