site-header nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 48px;
  height: 64px;
  background: var(--nav-bg);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  line-height: 1.65;
}

@media (min-width: 769px) {
  site-header nav { padding-left: 7.5rem; padding-right: 7.5rem; }
}

.nav-brand { display: flex; align-items: center; gap: 12px; min-width: 0; }

.nav-logo {
  font-family: 'Cabinet Grotesk', sans-serif;
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: -0.02em;
  color: var(--text);
  text-decoration: none;
  display: flex;
  flex-direction: column;
  gap: 2px;
  line-height: 1;
}

.nav-logo-sub {
  font-family: 'DM Sans', sans-serif;
  font-weight: 300;
  font-size: 0.6rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.nav-actions { display: flex; align-items: center; gap: 0; }

.nav-links { display: flex; gap: 36px; list-style: none; }

.nav-links a {
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--text); }

.nav-menu-toggle { display: none; }

.lang-switcher {
  display: flex;
  align-items: center;
  gap: 2px;
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 4px;
  margin-left: 24px;
}

.lang-btn {
  background: none;
  border: none;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  cursor: pointer;
  padding: 4px 10px;
  border-radius: 100px;
  transition: all 0.2s;
}
.lang-btn.active { background: var(--bg3); color: var(--text); }
.lang-btn:hover:not(.active) { color: var(--text); }

.theme-toggle {
  width: 34px;
  height: 34px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-left: 10px;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--control-bg);
  color: var(--muted);
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s, background 0.2s, transform 0.2s;
}
.theme-toggle:hover { color: var(--text); border-color: var(--interactive-border); transform: translateY(-1px); }

.theme-icon {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.theme-icon-moon { display: none; fill: currentColor; stroke: none; }
:root[data-theme="light"] .theme-icon-sun { display: none; }
:root[data-theme="light"] .theme-icon-moon { display: block; }

.page-controls { position: relative; z-index: 130; }

.page-back-control,
.scroll-top-control {
  position: fixed;
  z-index: 130;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 40px;
  padding: 0 14px;
  border: 1px solid var(--interactive-border);
  border-radius: 999px;
  background: var(--bg2);
  color: var(--text);
  font: inherit;
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  box-shadow: 0 14px 40px rgba(0,0,0,0.22);
  transition: opacity 0.2s ease, transform 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.page-back-control { top: 80px; left: 7.5rem; }

.scroll-top-control {
  right: 7.5rem;
  bottom: calc(24px + var(--scroll-top-lift, 0px));
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
}
.scroll-top-control.is-visible { visibility: visible; opacity: 1; pointer-events: auto; transform: translateY(0); }

.page-back-control:hover,
.scroll-top-control:hover { background: var(--bg3); border-color: var(--hover-border); }

.page-back-control svg,
.scroll-top-control svg {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

@media (min-width: 769px) {
  .nav-logo-sub { white-space: nowrap; }
}

@media (max-width: 1360px) {
  .nav-links { gap: 24px; }
  .nav-links a { font-size: 0.75rem; }
}

@media (max-width: 1200px) {
  nav .nav-links { display: none; }

  .nav-menu-toggle { display: inline-flex; align-items: center; justify-content: center; flex-shrink: 0; width: 34px; height: 34px; padding: 0; border: 1px solid var(--border); border-radius: 50%; background: var(--control-bg); color: var(--text); cursor: pointer; }
  .nav-menu-toggle svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; }
  .nav-menu-icon-close { display: none; }
  nav.is-menu-open .nav-menu-icon-open { display: none; }
  nav.is-menu-open .nav-menu-icon-close { display: block; }
  nav.is-menu-open { z-index: 140; }
  nav.is-menu-open .nav-links { display: flex; position: fixed; top: 64px; left: 0; right: 0; flex-direction: column; gap: 0; padding: 8px 24px 16px; background: var(--bg); border-bottom: 1px solid var(--border); }
  nav.is-menu-open .nav-links a { display: block; padding: 14px 0; font-size: 0.85rem; border-bottom: 1px solid var(--border); }
  nav.is-menu-open .nav-links li:last-child a { border-bottom: 0; }
  .nav-menu-toggle:focus-visible, nav.is-menu-open .nav-links a:focus-visible { outline: 2px solid var(--text); outline-offset: 3px; }
}

@media (min-width: 769px) and (max-width: 1200px) {
  nav.is-menu-open .nav-links { padding-left: 7.5rem; padding-right: 7.5rem; }
}

@media (max-width: 768px) {
  site-header nav { padding: 0 24px; }
  .page-back-control { top: auto; bottom: 16px; left: 24px; }
  .scroll-top-control { right: 24px; bottom: calc(16px + var(--scroll-top-lift, 0px)); }
}

@media (max-width: 380px) {
  .nav-logo-sub { display: none; }
}