/* Header-specific styling for Puzzle Game Flow */

.site-header {
  position: relative;
  z-index: 40;
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-4);
  padding-block: 0.2rem;
}

.site-brand-mark {
  width: 2.4rem;
  height: 2.4rem;
  border-radius: 0.9rem;
  background:
    conic-gradient(from 210deg, var(--color-primary), var(--color-accent), var(--color-primary));
  box-shadow: var(--shadow-glow-primary);
  position: relative;
  overflow: hidden;
}

.site-brand-mark::after {
  content: "";
  position: absolute;
  inset: 0.25rem;
  border-radius: 0.7rem;
  background: radial-gradient(circle at 20% 0, rgba(250, 250, 255, 0.14), transparent 45%),
    radial-gradient(circle at 80% 100%, rgba(15, 23, 42, 0.96), rgba(5, 8, 22, 1));
}

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

.site-brand-title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.site-brand-subtitle {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

/* Primary navigation */

.primary-nav {
  display: flex;
  align-items: center;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

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

.nav-cta {
  padding: 0.45rem 1.1rem;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(61, 242, 255, 0.7);
  background: radial-gradient(circle at 0 0, rgba(61, 242, 255, 0.22), transparent 60%),
    linear-gradient(135deg, rgba(15, 23, 42, 0.98), rgba(15, 23, 42, 0.98));
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-primary);
  box-shadow: 0 0 0 1px rgba(15, 23, 42, 0.9);
}

.nav-cta:hover {
  color: #020617;
  background: linear-gradient(135deg, #06b6d4, #3b82f6);
  box-shadow: var(--shadow-md), var(--shadow-glow-primary);
}

/* Mobile nav toggle */

.nav-toggle {
  display: none;
  position: relative;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(30, 64, 175, 0.8);
  background: radial-gradient(circle at 30% 0, rgba(61, 242, 255, 0.18), transparent 60%),
    rgba(15, 23, 42, 0.96);
  justify-content: center;
  align-items: center;
  flex-direction: column;
  gap: 0.28rem;
  cursor: pointer;
  color: var(--color-text);
}

.nav-toggle-bar {
  width: 1.15rem;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

.nav-toggle.is-open .nav-toggle-bar:nth-child(1) {
  transform: translateY(4px) rotate(45deg);
}

.nav-toggle.is-open .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle.is-open .nav-toggle-bar:nth-child(3) {
  transform: translateY(-4px) rotate(-45deg);
}

/* Responsive layout */

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

  .primary-nav {
    position: absolute;
    inset-inline: 0;
    top: 100%;
    transform-origin: top;
    transform: scaleY(1);
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height var(--transition-slow), opacity var(--transition-normal);
    background: linear-gradient(180deg, rgba(5, 8, 22, 0.98), rgba(5, 8, 22, 0.96));
    border-bottom: 1px solid rgba(15, 23, 42, 0.9);
  }

  .primary-nav.is-open {
    max-height: 18rem;
    opacity: 1;
    padding: 30px 20px;
  }

  .nav-links {
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-6) var(--container-gutter) var(--space-6);
    gap: var(--space-4);
  }

  .nav-item--cta {
    margin-left: 0;
    width: 100%;
  }

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

@media (max-width: 600px) {
  .site-brand-title {
    font-size: var(--font-size-base);
  }

  .site-brand-subtitle {
    display: none;
  }
}