:root {
  --chrome-pad: clamp(2rem, 6vw, 7rem);
  --chrome-max: 1400px;
  --chrome-header-pad-y: 1rem;
  --chrome-logo: 150px;
  --chrome-header-offset: 5.5rem;
}

@media (max-width: 960px) {
  :root {
    --chrome-pad: clamp(3rem, 8vw, 5.5rem);
  }
}

@media (max-width: 790px) {
  :root {
    --chrome-pad: clamp(1.25rem, 5vw, 2rem);
    --chrome-logo: 120px;
  }
}

@media (max-width: 720px) {
  :root {
    --chrome-header-pad-y: 0.85rem;
    --chrome-logo: 110px;
    --chrome-header-offset: 4.75rem;
  }
}

/* —— Header —— */
.site-header {
  position: fixed;
  top: 0;
  right: 0;
  bottom: auto;
  left: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--chrome-header-pad-y) var(--chrome-pad);
}

.site-header.is-scrolled {
  backdrop-filter: blur(10px);
}

.site-header.is-on-light .nav a,
.site-header--light .nav a {
  color: #111;
}

.nav-toggle {
  display: none;
  appearance: none;
  border: 0;
  background: transparent;
  width: 2rem;
  height: 1.35rem;
  padding: 0;
  margin-left: auto;
  cursor: pointer;
  position: relative;
  z-index: 60;
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 1.5px;
  background: #fff;
  position: absolute;
  left: 0;
  transition: transform 0.3s ease, opacity 0.25s ease, top 0.3s ease;
}

.nav-toggle span:nth-child(1) { top: 0; }
.nav-toggle span:nth-child(2) { top: 50%; transform: translateY(-50%); }
.nav-toggle span:nth-child(3) { bottom: 0; top: auto; }

.site-header.is-on-light .nav-toggle span,
.site-header--light .nav-toggle span {
  background: #111;
}

.site-header.is-nav-open .nav-toggle span:nth-child(1) {
  top: 50%;
  transform: translateY(-50%) rotate(45deg);
}

.site-header.is-nav-open .nav-toggle span:nth-child(2) {
  opacity: 0;
}

.site-header.is-nav-open .nav-toggle span:nth-child(3) {
  top: 50%;
  bottom: auto;
  transform: translateY(-50%) rotate(-45deg);
}

.site-header.is-nav-open .nav-toggle span,
.site-header.is-on-light.is-nav-open .nav-toggle span,
.site-header--light.is-nav-open .nav-toggle span {
  background: #fff;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  width: var(--chrome-logo);
  z-index: 60;
}

.logo img {
  width: 100%;
  height: auto;
  object-fit: contain;
}

.nav {
  position: absolute;
  left: 55%;
  transform: translateX(-50%);
  display: flex;
  gap: clamp(4rem, 8vw, 8rem);
  align-items: center;
  font-size: 0.82rem;
  letter-spacing: 0.18em;
}

.nav a {
  opacity: 0.9;
}

.nav a:hover {
  opacity: 1;
}

.site-header--light {
  background: rgba(255, 255, 255, 0.68);
  backdrop-filter: blur(10px) saturate(20%);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.site-header:not(:has(.nav)) .nav-toggle {
  display: none !important;
}

@media (max-width: 790px) {
  .nav {
    left: 58%;
    gap: clamp(1.5rem, 4vw, 3rem);
    font-size: 0.72rem;
  }
}

@media (max-width: 720px) {
  .site-header {
    padding: var(--chrome-header-pad-y) var(--chrome-pad);
    flex-wrap: nowrap;
    gap: 0;
  }

  .nav-toggle {
    display: block;
  }

  .site-header.is-nav-open .nav-toggle {
    position: fixed;
    top: calc(var(--chrome-header-pad-y) + env(safe-area-inset-top, 0px) + (var(--chrome-logo) - 1.35rem) / 2);
    right: var(--chrome-pad);
    margin: 0;
    z-index: 80;
  }

  .nav {
    position: fixed;
    inset: 0 0 auto auto;
    left: 0;
    right: 0;
    top: 0;
    transform: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 1.75rem;
    width: 100%;
    height: 100dvh;
    padding: 5rem var(--chrome-pad) 3rem;
    background: rgba(12, 12, 13, 0.96);
    font-size: 1rem;
    letter-spacing: 0.18em;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.35s ease, visibility 0.35s ease;
    z-index: 55;
  }

  .site-header.is-nav-open .nav {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .site-header.is-nav-open .nav a,
  .site-header--light.is-nav-open .nav a {
    color: #fff;
  }
}

html:has(.site-header.is-nav-open),
body:has(.site-header.is-nav-open) {
  overflow: hidden;
  overscroll-behavior: none;
}