body.menu-open {
  overflow: hidden;
}

.site-header {
  position: fixed;
  z-index: 100;
  top: 0;
  right: 0;
  left: 0;
  border-bottom: 1px solid transparent;
  background: rgba(243, 242, 236, 0.88);
  backdrop-filter: blur(16px);
  transition: border-color 200ms ease;
}

.site-header.scrolled {
  border-color: var(--line);
}

.header-inner {
  display: flex;
  min-height: 76px;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand-mark {
  display: grid;
  width: 36px;
  height: 36px;
  place-items: center;
  border-radius: 50%;
  color: var(--white);
  background: var(--ink);
  font-family: var(--mono);
  font-size: 11px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 38px;
}

.site-nav a {
  position: relative;
  font-size: 14px;
  font-weight: 600;
}

.site-nav a::after {
  position: absolute;
  right: 0;
  bottom: -6px;
  left: 0;
  height: 1px;
  content: "";
  transform: scaleX(0);
  transform-origin: right;
  background: currentColor;
  transition: transform 220ms ease;
}

.site-nav a:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: transparent;
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  width: 21px;
  height: 1.5px;
  margin: 6px auto;
  background: var(--ink);
  transition: transform 180ms ease;
}

@media (max-width: 760px) {
  .header-inner {
    min-height: 68px;
  }

  .menu-toggle {
    position: relative;
    z-index: 2;
    display: block;
  }

  .menu-toggle[aria-expanded="true"] span:first-child {
    transform: translateY(3.75px) rotate(45deg);
  }

  .menu-toggle[aria-expanded="true"] span:last-child {
    transform: translateY(-3.75px) rotate(-45deg);
  }

  .site-nav {
    position: fixed;
    z-index: 1;
    inset: 0;
    display: flex;
    visibility: hidden;
    padding: 110px 24px 50px;
    align-items: flex-start;
    justify-content: center;
    flex-direction: column;
    gap: 24px;
    background: var(--bg);
    opacity: 0;
    transition: visibility 200ms, opacity 200ms;
  }

  .site-nav.is-open {
    visibility: visible;
    opacity: 1;
  }

  .site-nav a {
    font-size: 36px;
    letter-spacing: -0.04em;
  }
}

@media (max-width: 420px) {
  .brand > span:last-child {
    display: none;
  }
}