/* Dual header */
.topbar {
  background: var(--bg-elevated);
  min-height: var(--header-top);
  display: flex;
  align-items: center;
  font-size: 13px;
}

.topbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  padding-top: 0.5rem;
  padding-bottom: 0.5rem;
}

.topbar__contacts a {
  color: var(--text-muted);
  margin-right: 0.35rem;
}

.topbar__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}

.topbar__links a {
  color: var(--text-muted);
  text-transform: none;
  font-weight: 400;
}

.site-header {
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header__inner {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  min-height: 72px;
  padding-top: 0.5rem;
  padding-bottom: 0.5rem;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  flex-shrink: 0;
  color: var(--text);
}

.logo img,
.logo-mark {
  width: 48px;
  height: 48px;
  object-fit: contain;
  flex-shrink: 0;
}

.logo__name {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 400;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text);
}

.nav-toggle {
  display: none;
  margin-left: auto;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: var(--radius);
  padding: 0.5rem 0.75rem;
  cursor: pointer;
  font-family: var(--font-body);
  font-weight: 700;
  text-transform: uppercase;
  font-size: 12px;
}

.nav-main {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex: 1;
  flex-wrap: wrap;
}

.nav-main > a,
.nav-item > .nav-link {
  display: inline-block;
  padding: 0.55rem 0.7rem;
  font-weight: 700;
  font-size: 13px;
  text-transform: uppercase;
  color: var(--text);
  letter-spacing: 0.02em;
}

.nav-item {
  position: relative;
}

.nav-item:hover .mega,
.nav-item:focus-within .mega {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.mega {
  position: absolute;
  left: 0;
  top: 100%;
  min-width: 280px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  opacity: 0;
  visibility: hidden;
  transform: translateY(6px);
  transition: 0.15s ease;
  z-index: 120;
  display: grid;
  gap: 0.35rem;
}

.mega a {
  color: var(--text-muted);
  font-size: 13px;
  padding: 0.25rem 0;
  text-transform: none;
  font-weight: 400;
}

.mega--materials {
  width: min(460px, calc(100vw - 2rem));
  grid-template-columns: repeat(2, minmax(0, 1fr));
  max-height: min(70vh, 480px);
  overflow-y: auto;
}

.mega--materials a:first-child {
  grid-column: 1 / -1;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.45rem;
  margin-bottom: 0.15rem;
}

.mega a:hover {
  color: var(--text);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-left: auto;
}

.header-actions a {
  font-weight: 700;
  font-size: 13px;
  text-transform: uppercase;
}

/* Footer */
.site-footer {
  background: var(--bg-elevated);
  border-top: 1px solid var(--border);
  padding: 2.5rem 0 2rem;
  margin-top: 0;
}

.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem 2rem;
  align-items: center;
  justify-content: space-between;
}

.site-footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}

.site-footer__links a {
  color: var(--text-muted);
  font-size: 13px;
}

.site-footer__brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text);
}

.site-footer__brand img {
  width: 36px;
  height: 36px;
}

.site-footer__meta {
  width: 100%;
  color: var(--text-muted);
  font-size: 13px;
  margin-top: 0.5rem;
}

@media (max-width: 991px) {
  .nav-toggle {
    display: inline-block;
  }

  .nav-main {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    padding: 0.5rem 0 1rem;
  }

  .nav-main.is-open {
    display: flex;
  }

  .nav-item .mega {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    border: 0;
    background: transparent;
    padding: 0 0 0.5rem 1rem;
    display: none;
  }

  .nav-item.is-open .mega {
    display: grid;
  }

  .mega--materials {
    width: 100%;
    grid-template-columns: 1fr;
    max-height: min(55vh, 420px);
  }

  .site-header__inner {
    flex-wrap: wrap;
  }

  .header-actions {
    margin-left: 0;
  }
}