.bar {
  position: fixed;
  z-index: 50;
  inset: 0 0 auto 0;
  border-bottom: 1px solid transparent;
  transition: background-color 0.25s, border-color 0.25s;
}

.solid {
  background: var(--topbar-bg);
  border-bottom-color: var(--line);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}

.inner {
  width: var(--shell);
  height: 68px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 32px;
}

.mark {
  margin-right: auto;
  font: 700 20px/1 var(--font-head);
  letter-spacing: -0.03em;
  text-decoration: none;
}

.nav {
  display: flex;
  gap: 28px;
  font-size: 15px;
  font-weight: 500;
}

.nav a {
  text-decoration: none;
  padding: 6px 0;
  background: linear-gradient(currentColor, currentColor) left bottom / 0 1.5px no-repeat;
  transition: background-size 0.25s;
}

.nav a:hover {
  background-size: 100% 1.5px;
}

.cta {
  margin-left: -12px;
  padding: 10px 18px;
  border-radius: var(--radius-control);
  background: var(--ink);
  color: var(--paper);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: background-color 0.2s;
}

.cta:hover {
  background: var(--z);
}

@media (max-width: 860px) {
  .nav {
    display: none;
  }
}

.toggle {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 0;
  border-radius: var(--radius-control);
  background: transparent;
  color: var(--ink);
  box-shadow: inset 0 0 0 1px var(--line);
  cursor: pointer;
  transition: box-shadow 0.2s;
}

.toggle:hover {
  box-shadow: inset 0 0 0 1.5px var(--ink);
}

.toggle svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}