.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid var(--line);
  background: rgba(242, 238, 235, 0.94);
  backdrop-filter: blur(10px);
}

.container {
  width: min(100% - 48px, var(--content));
  margin-inline: auto;
}

.header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 12px;
  color: var(--ink);
  font-size: 21px;
  font-weight: 600;
  letter-spacing: 5px;
  white-space: nowrap;
}

.brand-subtitle {
  color: var(--muted);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 2px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.language-switch {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  overflow: hidden;
  background: var(--white);
}

.language-switch button {
  min-width: 40px;
  padding: 7px 10px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 11px;
  font-weight: 600;
}

.language-switch button[aria-pressed="true"] {
  background: var(--ink);
  color: var(--white);
}

.demo-badge {
  display: inline-flex;
  align-items: center;
  min-height: 29px;
  padding: 5px 13px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  color: var(--stone);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.5px;
  white-space: nowrap;
}

.step-nav {
  display: flex;
  gap: 22px;
  min-height: 42px;
  overflow-x: auto;
  scrollbar-width: none;
}

.step-nav::-webkit-scrollbar { display: none; }

.step-link {
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  border-bottom: 1.5px solid transparent;
  color: var(--faint);
  font-size: 12.5px;
  white-space: nowrap;
}

.step-link.is-current {
  border-color: var(--ink);
  color: var(--ink);
  font-weight: 600;
}

.step-link.is-complete {
  color: var(--stone);
  font-weight: 500;
}

.page-main {
  padding: 40px 0 96px;
}

.page-grid-2,
.page-grid-3 {
  display: grid;
  gap: 20px;
}

.page-grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.page-grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.split {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
  gap: 24px;
}

.button-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 24px;
  flex-wrap: wrap;
}

.button-row.end { justify-content: flex-end; }

.site-footer-note {
  margin-top: 28px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  color: var(--faint);
  font-size: 11.5px;
  line-height: 1.65;
}

@media (max-width: 800px) {
  .container { width: min(100% - 30px, var(--content)); }
  .header-bar { min-height: 58px; }
  .brand-subtitle, .demo-badge { display: none; }
  .page-main { padding: 26px 0 72px; }
  .page-grid-2, .page-grid-3, .split { grid-template-columns: 1fr; }
  .step-nav { gap: 18px; }
}