/* Header layout */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  background: linear-gradient(90deg, rgba(6, 7, 18, 0.92), rgba(6, 7, 18, 0.94));
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

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

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

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
}

.brand-mark {
  width: 38px;
  height: 38px;
  border-radius: 999px;
  border: 2px solid rgba(230, 57, 70, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-xs), var(--shadow-glow-primary);
  background: radial-gradient(circle at 30% 0%, rgba(230, 57, 70, 0.6), transparent 55%),
              radial-gradient(circle at 70% 100%, rgba(63, 81, 181, 0.45), transparent 55%),
              #060712;
}

.brand-chip {
  width: 18px;
  height: 18px;
  border-radius: 999px;
  border: 2px solid #fff;
  position: relative;
}

.brand-chip::before,
.brand-chip::after {
  content: "";
  position: absolute;
  inset: 50%;
  width: 140%;
  height: 2px;
  background: #fff;
  transform-origin: center;
}

.brand-chip::before {
  transform: translate(-50%, -50%) rotate(0deg);
}

.brand-chip::after {
  transform: translate(-50%, -50%) rotate(90deg);
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-family: var(--font-display);
  font-size: var(--font-size-lg);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.brand-tagline {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.16em;
}

/* Navigation */
.site-nav {
  display: flex;
  align-items: center;
}

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

.nav-link {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  padding: 0.35rem 0;
  position: relative;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.3rem;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, #ff6b6b, var(--color-primary));
  transition: width var(--transition-normal);
}

.nav-link:hover::after,
.nav-link:focus-visible::after {
  width: 100%;
}

.nav-cta-wrapper {
  margin-left: var(--space-4);
}

.nav-cta {
  font-size: var(--font-size-xs);
}

/* Mobile toggle */
.nav-toggle {
  display: none;
  position: relative;
  width: 40px;
  height: 40px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.24);
  background: rgba(6, 7, 18, 0.9);
  cursor: pointer;
  align-items: center;
  justify-content: center;
  padding: 0;
}

.nav-toggle-bar {
  width: 18px;
  height: 2px;
  background: #fff;
  border-radius: 999px;
  transition: transform var(--transition-normal), opacity var(--transition-normal), top var(--transition-normal), bottom var(--transition-normal);
  position: absolute;
}

.nav-toggle-bar:nth-child(1) {
  top: 13px;
}

.nav-toggle-bar:nth-child(2) {
  top: 19px;
}

.nav-toggle-bar:nth-child(3) {
  top: 25px;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: rotate(45deg);
  top: 19px;
}

.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: rotate(-45deg);
  top: 19px;
}

/* Responsive */
@media (max-width: 900px) {
  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    inset-inline: 0;
    top: 100%;
    background: radial-gradient(circle at 0 0, rgba(230, 57, 70, 0.16), transparent 48%),
                var(--color-surface-elevated);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    transform-origin: top;
    transform: scaleY(0.8);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-normal), transform var(--transition-normal);
  }

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

  .nav-list {
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-4) var(--space-4) var(--space-5);
    gap: var(--space-3);
  }

  .nav-cta-wrapper {
    margin-left: 0;
    margin-top: var(--space-2);
    width: 100%;
  }

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

@media (max-width: 520px) {
  .brand-tagline {
    display: none;
  }

  .brand-name {
    font-size: var(--font-size-base);
  }
}