/* ============================================================
   StatGazer (RU) — глобальная шапка + мобильное меню.
   Порт header.css со statgazer.com; отличия только шрифтовые:
   постер-шрифт Sofia Sans требует явного веса 800
   (Archivo Black «чёрный» уже на 400).
   Потребляет токены из tokens.css.
   ============================================================ */

:root {
  --s2: 8px;
  --s4: 16px;
  --s5: 24px;
  --s6: 32px;
  --s8: 64px;
  --t-color: 160ms;
  --t-hover: 220ms;
  --ease: cubic-bezier(0.2, 0.6, 0.2, 1);
  --accent-ink: #ffffff;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-padding-top: calc(var(--nav-h, 64px) + 16px);
}

body {
  margin: 0;
  background: var(--paper, #f7f8fa);
  color: var(--ink, #0b1220);
  font-family: var(--font-body, system-ui, sans-serif);
}

.skip-link {
  position: fixed;
  top: -100px;
  left: 16px;
  z-index: 1000;
  padding: 12px 18px;
  background: var(--ink, #0b1220);
  color: #fff;
  font: 600 0.9rem/1 var(--font-body, system-ui, sans-serif);
  text-decoration: none;
  border-radius: var(--r-btn, 6px);
  transition: top 160ms var(--ease);
}

.skip-link:focus-visible {
  top: 12px;
}

body {
  padding-top: var(--nav-h, 64px);
}

body.menu-open {
  overflow: hidden;
}

.container {
  width: 100%;
  max-width: var(--maxw, 1200px);
  margin-inline: auto;
  padding-inline: var(--gutter, clamp(20px, 5vw, 64px));
  min-width: 0;
}

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 200;
  border-bottom: 1px solid var(--border, #e5e8ef);
  background: rgba(247, 248, 250, 0.96);
  transition: background-color var(--t-hover) var(--ease),
              border-color var(--t-hover) var(--ease),
              box-shadow var(--t-hover) var(--ease);
}

.nav.is-scrolled {
  background: rgba(247, 248, 250, 0.82);
  -webkit-backdrop-filter: blur(10px) saturate(120%);
  backdrop-filter: blur(10px) saturate(120%);
  border-bottom-color: var(--border-strong, #d2d8e4);
  box-shadow: var(--shadow-nav);
}

.nav__bar {
  height: var(--nav-h, 64px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s5);
}

.wordmark {
  font-family: var(--font-display, "Sofia Sans", "Arial Black", system-ui, sans-serif);
  font-weight: var(--sg-poster-weight, 800);
  font-size: 1.18rem;
  letter-spacing: 0;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: var(--ink, #0b1220);
  text-decoration: none;
  min-width: max-content;
}

.wordmark__mark {
  width: 30px;
  height: 30px;
  flex: 0 0 auto;
}

.wordmark__text {
  line-height: 1;
}

.wordmark__loc {
  color: var(--muted, #5a6577);
  font: 400 0.5rem/1 var(--font-mono, monospace);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  top: 0.2em;
  position: relative;
}

.nav__desktop {
  display: flex;
  align-items: center;
  gap: clamp(var(--s4), 2vw, var(--s6));
  min-width: 0;
}

.nav__link {
  color: var(--muted, #5a6577);
  font: 400 var(--fs-tag, 0.6875rem)/1 var(--font-mono, monospace);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  position: relative;
  padding: 8px 2px;
  white-space: nowrap;
  transition: color var(--t-color) var(--ease);
}

.nav__desktop .btn {
  white-space: nowrap;
}

.nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 2px;
  width: 0;
  height: 1px;
  background: var(--accent, #0e7c7b);
  transition: width var(--t-color) var(--ease);
}

.nav__link:hover,
.nav__link:focus-visible,
.nav__link[aria-current] {
  color: var(--ink, #0b1220);
}

.nav__link:hover::after,
.nav__link:focus-visible::after,
.nav__link[aria-current]::after {
  width: 100%;
}

.nav .btn,
.menu .btn {
  min-height: 0;
  justify-content: center;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 22px;
  border-radius: var(--r-btn, 6px);
  border: 1px solid transparent;
  background: var(--accent, #0e7c7b);
  color: var(--accent-ink);
  font: 600 0.95rem/1 var(--font-body, "Inter", system-ui, sans-serif);
  text-decoration: none;
  white-space: nowrap;
  transition: background var(--t-color) var(--ease), transform var(--t-hover) var(--ease);
}

.nav .btn:hover,
.nav .btn:focus-visible,
.menu .btn:hover,
.menu .btn:focus-visible {
  background: var(--accent-hover, #0c5e5d);
  color: var(--accent-ink);
  transform: translateY(-1px);
}

.nav .btn--sm {
  padding: 10px 16px;
  font-size: 0.9375rem;
}

.menu .btn__caret {
  font-family: var(--font-mono, monospace);
  font-weight: 400;
  font-size: 0.9em;
}

.nav__toggle {
  display: none;
  align-items: center;
  gap: 8px;
  border: 0;
  background: transparent;
  color: var(--ink, #0b1220);
  padding: 12px 6px;
  min-height: 44px;
  font: 400 var(--fs-tag, 0.6875rem)/1 var(--font-mono, monospace);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.nav__toggle-bars {
  width: 18px;
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
}

.nav__toggle-bars span {
  display: block;
  height: 1.5px;
  background: currentColor;
  transform-origin: center;
  transition: transform var(--t-color) var(--ease), opacity var(--t-color) var(--ease);
}

.nav__toggle[aria-expanded="true"] .nav__toggle-bars span:nth-child(1) {
  transform: translateY(5.5px) rotate(45deg);
}

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

.nav__toggle[aria-expanded="true"] .nav__toggle-bars span:nth-child(3) {
  transform: translateY(-5.5px) rotate(-45deg);
}

.menu {
  position: fixed;
  inset: 0;
  z-index: 150;
  background: var(--surface, #ffffff);
  padding: calc(var(--nav-h, 64px) + var(--s6)) var(--gutter, clamp(20px, 5vw, 64px)) var(--s8);
  display: flex;
  flex-direction: column;
  gap: var(--s6);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 200ms var(--ease), visibility 200ms var(--ease);
  overflow-y: auto;
}

.menu.is-open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.menu__nav {
  display: flex;
  flex-direction: column;
}

.menu__link {
  display: flex;
  align-items: baseline;
  gap: var(--s4);
  color: var(--ink, #0b1220);
  text-decoration: none;
  font-family: var(--font-display, "Sofia Sans", "Arial Black", system-ui, sans-serif);
  font-weight: var(--sg-poster-weight, 800);
  font-size: 1.875rem;
  line-height: 1;
  letter-spacing: 0;
  padding: var(--s4) 0;
  border-bottom: 1px solid var(--border, #e5e8ef);
}

.menu__link[aria-current] {
  color: var(--accent, #0e7c7b);
}

.menu__idx {
  color: var(--muted, #5a6577);
  font: 400 0.7rem/1 var(--font-mono, monospace);
  letter-spacing: 0.08em;
}

.menu__cta {
  margin-top: var(--s2);
}

.menu__meta {
  color: var(--muted, #5a6577);
  font: 700 0.7rem/1.4 var(--font-mono, monospace);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

@media (hover: hover) {
  .menu .menu__link:hover {
    color: var(--ink, #0b1220);
  }

  a.wordmark:hover {
    color: var(--ink, #0b1220);
  }
}

@media (max-width: 1119px) {
  .nav__desktop {
    display: none;
  }

  .wordmark__loc {
    display: none;
  }

  .nav__toggle {
    display: inline-flex;
  }
}

@media (min-width: 1120px) {
  .menu {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .nav,
  .nav__link,
  .nav__link::after,
  .menu,
  .nav .btn,
  .menu .btn,
  .nav__toggle-bars span {
    transition: none;
  }
}