/* Плавающая стеклянная шапка — токены из style.md (тёмный fashion), не бирюза методички */
:root {
  --hdr-bg: 20, 20, 20;
  --hdr-glass: rgba(var(--hdr-bg), 0.72);
  --hdr-glass-float: rgba(var(--hdr-bg), 0.42);
  --hdr-ink: #f5f5f5;
  --hdr-mark-fg: #1a1a1a;
  --hdr-accent: #ffffff;
  --hdr-accent-ink: #1a1a1a;
  --hdr-scrim: rgba(0, 0, 0, 0.45);
  --hdr-shadow: rgba(0, 0, 0, 0.28);
  --hdr-panel: #1a1a1a;
  --hdr-ease: cubic-bezier(0.22, 1, 0.36, 1);
  --hdr-z: 60;
}

html {
  scroll-padding-top: calc(92px + env(safe-area-inset-top, 0px));
}

.site-header {
  position: fixed;
  inset-inline: 0;
  top: 0;
  z-index: var(--hdr-z);
  background: transparent;
  color: var(--hdr-ink);
  padding-top: max(14px, env(safe-area-inset-top, 0px));
  padding-bottom: 14px;
  opacity: 1;
  visibility: visible;
  transition:
    top 0.5s var(--hdr-ease),
    left 0.5s var(--hdr-ease),
    right 0.5s var(--hdr-ease),
    padding 0.5s var(--hdr-ease),
    border-radius 0.5s var(--hdr-ease),
    box-shadow 0.5s var(--hdr-ease);
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  border-radius: inherit;
  background: var(--hdr-glass);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
  transition: background 0.5s var(--hdr-ease);
  pointer-events: none;
}

.site-header.is-float {
  top: max(12px, env(safe-area-inset-top, 0px));
  left: 18px;
  right: 18px;
  padding-top: 8px;
  padding-bottom: 8px;
  border-radius: 36px;
  box-shadow:
    0 16px 48px var(--hdr-shadow),
    inset 0 1px 0 rgba(255, 255, 255, 0.12);
}

.site-header.is-float::before {
  background: var(--hdr-glass-float);
}

/* тема героя: на старте (не float) цвет лого подстраивается */
.page:has(.hero[data-theme="graphite"]) .site-header:not(.is-float),
.page:has(.hero[data-theme="burgundy"]) .site-header:not(.is-float) {
  --hdr-ink: #f5f5f5;
  --hdr-mark-fg: #1a1a1a;
}
.page:has(.hero[data-theme="sage"]) .site-header:not(.is-float),
.page:has(.hero[data-theme="terracotta"]) .site-header:not(.is-float) {
  --hdr-ink: #2a2a2a;
  --hdr-mark-fg: #f5f5f5;
}
.page:has(.hero[data-theme="sage"]) .site-header:not(.is-float)::before,
.page:has(.hero[data-theme="terracotta"]) .site-header:not(.is-float)::before {
  background: rgba(255, 255, 255, 0.28);
}

.site-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-inline: clamp(14px, 3vw, 28px);
  max-width: 1400px;
  margin: 0 auto;
}

.site-header .logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  color: var(--hdr-ink);
  transition: color 0.3s var(--hdr-ease);
}

.site-header .logo-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 6px;
  background: var(--hdr-ink);
  color: var(--hdr-mark-fg);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  transition: height 0.5s var(--hdr-ease), width 0.5s var(--hdr-ease), background 0.3s ease, color 0.3s ease;
}

.site-header.is-float .logo-mark {
  width: 28px;
  height: 28px;
  font-size: 10px;
}

.site-header .logo-text {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.site-header .nav-pill {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  flex: 1 1 auto;
  margin-inline: auto;
  padding: 5px;
  max-width: max-content;
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.38);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.site-header .nav-link {
  padding: 9px 16px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.78);
  transition: color 0.2s ease, background 0.2s ease, transform 0.2s ease;
}

@media (hover: hover) and (pointer: fine) {
  .site-header .nav-link:hover {
    color: var(--hdr-accent);
    transform: scale(1.02);
  }
}

.site-header .nav-link.is-active {
  background: #fff;
  color: #1a1a1a;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
  margin-left: auto;
}

.site-header .cart-btn {
  appearance: none;
  border: 0;
  background: transparent;
  padding: 8px;
  border-radius: 999px;
  cursor: pointer;
  color: var(--hdr-ink);
  position: relative;
  transition: transform 0.2s ease, color 0.3s ease;
}

@media (hover: hover) and (pointer: fine) {
  .site-header .cart-btn:hover { transform: scale(1.08); }
}

.cart-count {
  position: absolute;
  top: 2px;
  right: 2px;
  min-width: 16px;
  height: 16px;
  border-radius: 999px;
  background: #fff;
  color: #1a1a1a;
  font-size: 10px;
  font-weight: 700;
  display: none;
  place-items: center;
  line-height: 1;
  padding: 0 4px;
}
.cart-count.is-on { display: grid; }

.site-header .burger {
  display: none;
  appearance: none;
  border: 0;
  background: transparent;
  width: 44px;
  height: 44px;
  padding: 11px;
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  gap: 0;
  position: relative;
  z-index: 80;
  margin-left: 0;
}

.site-header .burger span {
  display: block;
  height: 2px;
  width: 22px;
  margin: 0 auto;
  background: var(--hdr-ink);
  border-radius: 2px;
  transition:
    transform 0.35s var(--hdr-ease),
    opacity 0.25s ease,
    background 0.3s ease;
  position: absolute;
  left: 50%;
  margin-left: -11px;
}
.site-header .burger span:nth-child(1) { top: 14px; }
.site-header .burger span:nth-child(2) { top: 21px; }
.site-header .burger span:nth-child(3) { top: 28px; }

.site-header.is-open .burger span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.site-header.is-open .burger span:nth-child(2) {
  opacity: 0;
}
.site-header.is-open .burger span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.site-header .burger:focus-visible,
.site-header .cart-btn:focus-visible,
.site-header .nav-link:focus-visible {
  outline: 2px solid var(--hdr-accent);
  outline-offset: 3px;
}

/* слот: высоту пишет JS; на герое компенсируем отрицательным margin */
.site-header-slot {
  height: 92px;
  pointer-events: none;
}

.hero {
  margin-top: calc(-1 * var(--site-header-h, 92px));
}

.nav-scrim {
  position: fixed;
  inset: 0;
  z-index: 65;
  background: var(--hdr-scrim);
  border: 0;
  padding: 0;
  cursor: pointer;
}
.nav-scrim[hidden] { display: none; }

.mobile-nav {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  z-index: 70;
  width: min(78vw, 280px);
  padding:
    max(72px, calc(env(safe-area-inset-top, 0px) + 56px))
    20px
    max(24px, env(safe-area-inset-bottom, 0px));
  background: var(--hdr-panel);
  box-shadow: -12px 0 40px rgba(0, 0, 0, 0.35);
  display: flex;
  flex-direction: column;
  gap: 4px;
  transform: translateX(100%);
  transition: transform 0.45s var(--hdr-ease);
  overflow-y: auto;
}

.mobile-nav.is-open {
  transform: none;
}

.mobile-nav[hidden] { display: none; }
.mobile-nav:not([hidden]) { display: flex; }

.mobile-nav a {
  display: block;
  padding: 13px 12px;
  border-radius: 14px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #f5f5f5;
}

@media (hover: hover) and (pointer: fine) {
  .mobile-nav a:hover {
    background: rgba(255, 255, 255, 0.08);
    color: #fff;
  }
}

.mobile-nav a.is-active {
  background: #fff;
  color: #1a1a1a;
}

body.is-nav-open {
  overflow: hidden;
}

body.is-nav-open .to-top {
  opacity: 0;
  pointer-events: none;
}

@media (max-width: 900px) {
  html {
    scroll-padding-top: calc(84px + env(safe-area-inset-top, 0px));
  }

  .site-header .nav-pill { display: none; }
  .site-header .burger { display: flex; }

  .site-header.is-float {
    left: 10px;
    right: 10px;
    top: max(8px, env(safe-area-inset-top, 0px));
    border-radius: 24px;
  }

  .site-wrap {
    padding-inline: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .site-header,
  .site-header::before,
  .site-header .logo-mark,
  .site-header .burger span,
  .mobile-nav,
  .nav-scrim {
    transition: none !important;
  }
}