/* Header */
header {
  background: var(--bg-header);
  padding: 0.65rem 0;
  padding-top: max(0.65rem, env(safe-area-inset-top));
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-light);
}

.header-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-sm);
  min-height: var(--header-height);
}

header h1 {
  font-size: 1.5rem;
  margin: 0;
  color: var(--text-header);
  flex: 1 1 auto;
  min-width: 0;
}

.site-brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  text-decoration: none;
  color: inherit;
  min-width: 0;
}

.site-brand:hover {
  color: inherit;
}

header h1 img {
  max-height: 2.75rem;
  width: auto;
  display: block;
}

header nav {
  margin-left: auto;
}

header nav ul {
  list-style: none;
  display: flex;
  gap: 0.25rem 1.35rem;
  margin: 0;
  padding: 0;
  align-items: center;
}

header nav a {
  text-decoration: none;
  color: var(--text-header);
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-sm);
  letter-spacing: 0.01em;
  transition: color var(--transition-fast);
  position: relative;
  padding: 0.35rem 0;
}

header nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width var(--transition-fast);
}

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

header nav a:hover::after,
header nav a:focus-visible::after {
  width: 100%;
}

#menu-toggle {
  display: none;
  position: relative;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  margin-left: auto;
  flex-shrink: 0;
  cursor: pointer;
  background: transparent;
  border: none;
  border-radius: 999px;
  color: var(--text-header);
  transition:
    color var(--transition-normal),
    background-color var(--transition-normal);
}

#menu-toggle:hover,
#menu-toggle:focus-visible {
  color: var(--text-link);
  background-color: var(--color-primary-soft);
}

.menu-toggle__bar {
  position: absolute;
  left: 50%;
  width: 1.25rem;
  height: 2px;
  margin-left: -0.625rem;
  background: currentColor;
  border-radius: 999px;
  transition:
    transform var(--transition-normal),
    opacity 0.2s ease,
    top var(--transition-normal);
}

.menu-toggle__bar:nth-child(1) { top: 0.9rem; }
.menu-toggle__bar:nth-child(2) { top: 1.35rem; }
.menu-toggle__bar:nth-child(3) { top: 1.8rem; }

#menu-toggle.is-open .menu-toggle__bar:nth-child(1) {
  top: 1.35rem;
  transform: rotate(45deg);
}

#menu-toggle.is-open .menu-toggle__bar:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

#menu-toggle.is-open .menu-toggle__bar:nth-child(3) {
  top: 1.35rem;
  transform: rotate(-45deg);
}

@media (max-width: 56.24rem) {
  #menu-toggle {
    display: block;
  }

  header nav {
    margin-left: 0;
  }

  #menu {
    display: grid;
    grid-template-rows: 0fr;
    width: 100%;
    flex-basis: 100%;
    box-sizing: border-box;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    margin-top: 0;
    transition:
      grid-template-rows var(--transition-slow),
      opacity var(--transition-normal),
      visibility var(--transition-normal),
      margin-top var(--transition-normal);
  }

  .header-bar {
    flex-wrap: wrap;
  }

  #menu > ul {
    min-height: 0;
    overflow: hidden;
  }

  #menu.open {
    grid-template-rows: 1fr;
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    margin-top: 0.35rem;
  }

  #menu ul {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    margin: 0;
    padding: 0.25rem 0 0.5rem;
    width: 100%;
    align-items: stretch;
  }

  #menu li {
    width: 100%;
    opacity: 0;
    transform: translateY(-0.35rem);
    transition:
      opacity var(--transition-normal),
      transform var(--transition-normal);
  }

  #menu.open li {
    opacity: 1;
    transform: translateY(0);
  }

  #menu.open li:nth-child(1) { transition-delay: 0.04s; }
  #menu.open li:nth-child(2) { transition-delay: 0.08s; }
  #menu.open li:nth-child(3) { transition-delay: 0.12s; }

  header nav a {
    display: block;
    padding: 0.75rem 0.85rem;
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
  }

  header nav a::after {
    display: none;
  }

  header nav a:hover,
  header nav a:focus-visible {
    color: var(--text-link);
    background-color: var(--color-primary-soft);
  }
}

@media (max-width: 40rem) {
  header h1 img {
    max-height: 2.25rem;
  }

  .social-icons {
    gap: var(--spacing-xs);
  }

  .icon {
    width: 28px;
    height: 28px;
  }
}

/* Footer */
footer {
  background: var(--gradient-secondary);
  color: var(--text-inverse);
  text-align: center;
  padding: var(--spacing-xl) var(--space-page);
  padding-bottom: max(var(--spacing-xl), env(safe-area-inset-bottom));
  margin-top: var(--spacing-xxl);
}

.social-icons {
  display: flex;
  justify-content: center;
  gap: 1rem;
}

.icon {
  width: 32px;
  height: 32px;
  fill: currentColor;
  transition: color var(--transition-fast), transform var(--transition-fast);
  cursor: pointer;
}

.icon:hover,
.icon:focus-visible {
  transform: translateY(-1px);
  fill: var(--color-primary);
}

.icon-white {
  color: white;
}

p.footer-copyright {
  font-size: 0.875rem;
  color: var(--text-inverse);
  margin-top: var(--spacing-sm);
  text-align: center;
}

.footer-sep {
  margin: 0 0.4em;
}

footer .footer-privacy {
  color: var(--text-inverse);
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

footer .footer-privacy:hover,
footer .footer-privacy:focus-visible {
  color: var(--color-primary);
}