/* шапка и меню на весь экран */
.site-header { position: fixed; inset: 0 0 auto 0; z-index: 90; height: var(--hdr-h); color: var(--color-text); }
.site-header::before {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background: color-mix(in srgb, var(--color-background) 78%, transparent);
  -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
  opacity: 0; transition: opacity .4s var(--ease-out);
}
.site-header.is-scrolled::before { opacity: 1; }
.menu-open .site-header::before { opacity: 0; }
.menu-open .sh-nav { opacity: 0; pointer-events: none; }
.sh-nav { transition: opacity .3s; }
.sh-wrap { height: 100%; display: grid; grid-template-columns: minmax(calc(20vw - var(--pad)), max-content) 1fr auto; column-gap: 28px; align-items: center; padding: 0 var(--pad); }

.sh-logo { text-decoration: none; display: block; font-family: var(--ff-display); font-weight: var(--fw-display); font-synthesis: none; font-size: 14px; line-height: 1.12; letter-spacing: .14em; text-transform: uppercase; }
.sh-logo span { display: block; }

.sh-nav { display: flex; gap: clamp(26px, 3.6vw, 60px); align-items: center; }
.sh-nav a { position: relative; text-decoration: none; font: 600 11px/1 var(--ff-text); letter-spacing: .18em; text-transform: uppercase; padding: 10px 0; color: color-mix(in srgb, var(--color-text) 78%, transparent); transition: color .25s; }
.sh-nav a::after { content: ""; position: absolute; left: 0; bottom: 2px; width: 22px; height: 3px; background: var(--color-focus-ring); transform: scaleX(0); transform-origin: 0 50%; transition: transform .5s var(--ease-out); }
.sh-nav a:hover { color: var(--color-text); }
.sh-nav a:hover::after, .sh-nav a[aria-current="true"]::after { transform: scaleX(1); }
.sh-nav a[aria-current="true"] { color: var(--color-text); }

.sh-menu { appearance: none; border: 0; background: transparent; cursor: pointer; width: 44px; height: 44px; display: grid; grid-template-columns: repeat(3, 5px); grid-template-rows: repeat(3, 5px); gap: 5px; place-content: center; padding: 0; margin-right: -10px; }
.sh-menu i { display: block; width: 5px; height: 5px; background: var(--color-text); transition: transform .45s var(--ease-out), opacity .3s, background-color .3s; }
.sh-menu:hover i { background: var(--light-gold); }
.sh-menu:hover i:nth-child(odd) { background: var(--color-focus-ring); }
.sh-menu[aria-expanded="true"] i:nth-child(even) { opacity: 0; transform: scale(0); }

.site-menu {
  position: fixed; inset: 0; z-index: 80; display: grid; grid-template-columns: 1.4fr 1fr; align-items: end; gap: var(--pad);
  padding: calc(var(--hdr-h) + 24px) var(--pad) var(--pad);
  background: color-mix(in srgb, var(--color-background) 96%, black);
  clip-path: circle(0 at calc(100% - var(--pad) - 12px) 36px);
  visibility: hidden;
  transition: clip-path .9s var(--ease-io), visibility 0s linear .9s;
  overflow: hidden;
}
.site-menu::before, .site-menu::after { content: ""; position: absolute; inset: 0; pointer-events: none; filter: blur(8px); }
.site-menu::before { background: conic-gradient(from 94deg at 0% 0%, transparent 0deg, color-mix(in srgb, var(--light-violet) 30%, transparent) 4deg, color-mix(in srgb, var(--light-violet) 18%, transparent) 16deg, transparent 32deg); -webkit-mask-image: radial-gradient(115% 115% at 0 0, #000 0, #000 25%, transparent 78%); mask-image: radial-gradient(115% 115% at 0 0, #000 0, #000 25%, transparent 78%); }
.site-menu::after { background: conic-gradient(from 288deg at 100% 100%, transparent 0deg, color-mix(in srgb, var(--light-gold) 24%, transparent) 4deg, color-mix(in srgb, var(--light-gold) 14%, transparent) 16deg, transparent 32deg); -webkit-mask-image: radial-gradient(115% 115% at 100% 100%, #000 0, #000 25%, transparent 78%); mask-image: radial-gradient(115% 115% at 100% 100%, #000 0, #000 25%, transparent 78%); }
.site-menu.is-open { clip-path: circle(150vmax at calc(100% - var(--pad) - 12px) 36px); visibility: visible; transition: clip-path 1s var(--ease-io), visibility 0s; }

.sm-list { position: relative; list-style: none; margin: 0; padding: 0; display: grid; gap: 4px; }
.sm-list a { display: grid; grid-template-columns: clamp(52px, 6vw, 100px) 1fr; align-items: baseline; text-decoration: none; padding: 6px 0; border-top: 1px solid var(--line-soft); font-family: var(--ff-display); font-weight: var(--fw-display); font-synthesis: none; font-size: clamp(44px, 8vw, 128px); line-height: 1; letter-spacing: -.012em; }
.sm-list a small { font: 400 12px/1 var(--ff-mono); letter-spacing: .12em; color: var(--color-text-muted); transform: translateY(-.6em); }
.sm-list a span { transition: transform .6s var(--ease-out), color .3s; }
.sm-list a:hover span { transform: translateX(.18em); }
.sm-list a:hover { color: var(--color-text); }
.sm-list li, .sm-side > * { opacity: 0; transform: translateY(48px); transition: opacity .6s, transform .9s var(--ease-out); }
.site-menu.is-open .sm-list li, .site-menu.is-open .sm-side > * { opacity: 1; transform: none; }
.site-menu.is-open .sm-list li:nth-child(1) { transition-delay: .35s; }
.site-menu.is-open .sm-list li:nth-child(2) { transition-delay: .43s; }
.site-menu.is-open .sm-list li:nth-child(3) { transition-delay: .51s; }
.site-menu.is-open .sm-list li:nth-child(4) { transition-delay: .59s; }
.site-menu.is-open .sm-side > :nth-child(1) { transition-delay: .66s; }
.site-menu.is-open .sm-side > :nth-child(2) { transition-delay: .74s; }
.sm-side { position: relative; display: grid; gap: 22px; justify-items: start; padding-bottom: 8px; }
.sm-side p { color: var(--color-text-muted); max-width: 26ch; font-size: 15px; }

@media (max-width: 900px) {
  .sh-wrap { grid-template-columns: 1fr auto; }
  .sh-nav { display: none; }
  .site-menu { grid-template-columns: 1fr; align-content: space-between; padding-top: calc(var(--hdr-h) + 16px); }
}
@media (max-width: 480px) {
  :root { --hdr-h: 64px; }
  .sh-logo { font-size: 12px; letter-spacing: .12em; }
}
/* язык: правая группа шапки, на телефоне тоже на виду, не в меню */
.sh-tools { display: flex; align-items: center; gap: clamp(14px, 2vw, 28px); }
.sh-tools .sh-menu { margin-right: -10px; }
.lang-switch { --ls-w: 36px; --ls-h: 20px; --ls-dot: 12px; display: inline-flex; align-items: center; gap: 2px; flex-shrink: 0; user-select: none; -webkit-tap-highlight-color: transparent; color: var(--color-text); }
.lang-switch__lab { min-height: 36px; padding: 0 6px; border: 0; background: none; color: inherit; font: 500 11px/1 var(--ff-mono); letter-spacing: .14em; text-transform: uppercase; opacity: .45; cursor: pointer; transition: opacity .25s; }
.lang-switch__lab[aria-pressed="true"] { opacity: 1; }
.lang-switch__lab:hover { opacity: .85; }
.lang-switch__track { position: relative; width: var(--ls-w); height: var(--ls-h); padding: 0; border: 1px solid currentColor; border-radius: 999px; background: transparent; color: inherit; cursor: pointer; opacity: .8; }
.lang-switch__thumb { position: absolute; top: 50%; left: 3px; width: var(--ls-dot); height: var(--ls-dot); margin-top: calc(var(--ls-dot) / -2); border-radius: 50%; background: var(--light-violet); transition: transform .35s var(--ease-out), background-color .35s; }
.lang-switch[data-current="en"] .lang-switch__thumb { transform: translateX(calc(var(--ls-w) - var(--ls-dot) - 8px)); background: var(--light-gold); }
.lang-switch__track:focus-visible, .lang-switch__lab:focus-visible { outline: 2px solid var(--color-focus-ring); outline-offset: 3px; }
.menu-open .lang-switch { position: relative; z-index: 91; }
@media (max-width: 380px) { .lang-switch { --ls-w: 32px; --ls-h: 18px; --ls-dot: 11px; } .lang-switch__lab { padding: 0 4px; } .sh-tools { gap: 8px; } }

@media (prefers-reduced-motion: reduce) {
  .lang-switch__thumb { transition: none; }
  .site-menu { clip-path: none; opacity: 0; transition: opacity .01ms, visibility 0s; }
  .site-menu.is-open { opacity: 1; }
  .sm-list li, .sm-side > * { opacity: 1; transform: none; }
}