.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px clamp(18px, 4vw, 56px);
  background: rgba(247, 245, 239, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
}

.brand-mark,
.tool-icon {
  display: inline-grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border-radius: 6px;
  background: var(--ink);
  color: var(--surface);
  font-weight: 900;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 6px;
}

.nav a {
  padding: 8px 10px;
  color: var(--muted);
  font-size: 0.92rem;
}

.nav a:hover {
  background: var(--accent-soft);
  color: var(--ink);
}

.menu-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  min-height: 42px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, var(--surface-strong), var(--accent-soft));
  color: var(--ink);
  padding: 8px 12px;
  cursor: pointer;
  box-shadow: 0 8px 18px rgba(31, 36, 48, 0.08);
  font-weight: 850;
  transition:
    border-color 160ms ease,
    box-shadow 160ms ease,
    transform 160ms ease,
    background 160ms ease;
}

.menu-toggle:hover {
  border-color: var(--accent);
  box-shadow: 0 10px 24px rgba(31, 36, 48, 0.14);
  transform: translateY(-1px);
}

.menu-toggle[aria-expanded="true"] {
  border-color: var(--accent);
  background: var(--ink);
  color: white;
}

.menu-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  transform-origin: center;
  transition:
    opacity 160ms ease,
    transform 160ms ease;
}

.menu-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(5px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.menu-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-5px) rotate(-45deg);
}

.menu-toggle strong {
  font-size: 0.9rem;
  line-height: 1;
}

.footer {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: 24px;
  border-top: 1px solid var(--line);
  padding: 34px clamp(18px, 4vw, 56px);
  background: var(--ink);
  color: white;
}

.footer h2 {
  margin-bottom: 10px;
  font-size: 1rem;
}

.footer a {
  display: block;
  margin: 6px 0;
  color: rgba(255, 255, 255, 0.78);
}

.footer p {
  color: var(--muted);
}

.footer-brand {
  color: white;
}

.footer .brand-mark {
  background: var(--accent);
}

.copyright {
  grid-column: 1 / -1;
  margin: 12px 0 0;
  border-top: 1px solid rgba(255, 255, 255, 0.16);
  padding-top: 18px;
}