/* Header-specific styles for Centre Informatique Universel */

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(18px);
  background: linear-gradient(90deg, rgba(5, 6, 10, 0.96), rgba(5, 6, 10, 0.9));
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 0;
  gap: var(--space-8);
}

.site-header__brand {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.site-header__logo-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-8);
  border-bottom: 0;
}

.site-header__logo-mark {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: radial-gradient(circle at 30% 0, rgba(91, 140, 255, 0.9), transparent 65%),
    linear-gradient(145deg, #05060a, #151a2c);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-soft);
}

.site-header__logo-glyph {
  color: var(--color-primary);
  font-size: 1.15rem;
}

.site-header__logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.site-header__title {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.site-header__subtitle {
  font-size: var(--font-size-xs);
  color: var(--gray-700);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* Navigation */

.site-header__nav {
  display: flex;
  align-items: center;
}

.site-header__nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-12);
}

.site-header__nav-item a {
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--gray-700);
  padding-bottom: 4px;
  border-bottom: 2px solid transparent;
}

.site-header__nav-item a:hover,
.site-header__nav-item a:focus-visible,
.site-header__nav-item a[aria-current="page"] {
  color: var(--color-text);
  border-bottom-color: var(--color-primary);
}

.site-header__nav-item--cta a {
  border-bottom: 0;
}

.site-header__nav-item--cta .btn {
  font-size: var(--font-size-xs);
}

/* Mobile toggle */

.site-header__toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 4px;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  border: 1px solid var(--gray-300);
  background-color: var(--gray-100);
  cursor: pointer;
  color: var(--color-text);
}

.site-header__toggle-bar {
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background-color: var(--gray-700);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.site-header__toggle:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Toggle animation when menu is open */

.site-header__toggle[aria-expanded="true"] .site-header__toggle-bar:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-bar:nth-child(2) {
  opacity: 0;
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-bar:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* Responsive behavior */

@media (max-width: 799px) {
  .site-header__nav {
    position: fixed;
    inset-inline: 0;
    top: 56px;
    background: radial-gradient(circle at top, rgba(91, 140, 255, 0.08), transparent 55%),
      rgba(5, 6, 10, 0.98);
    transform: translateY(-110%);
    opacity: 0;
    visibility: hidden;
    transition: transform var(--transition-base), opacity var(--transition-base), visibility var(--transition-base);
  }

  .site-header__nav-list {
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-16);
    gap: var(--space-8);
  }

  .site-header__nav-item--cta {
    width: 100%;
    margin-top: var(--space-8);
  }

  .site-header__nav-item--cta .btn {
    width: 100%;
    justify-content: center;
  }

  .site-header__nav--open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
}

@media (min-width: 800px) {
  .site-header__toggle {
    display: none;
  }

  .site-header__nav {
    position: static;
  }

  .site-header__nav-list {
    gap: var(--space-16);
  }

  .site-header__nav-item--cta .btn {
    font-size: var(--font-size-sm);
  }
}