:root {
  --side-nav-width: clamp(44px, 5vw, 58px);
}

.side-nav {
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  z-index: 120;
  width: var(--side-nav-width);
  border-right: 0;
  background: var(--orange);
  display: flex;
  align-items: center;
  justify-content: center;
}

.side-nav nav {
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 1.25rem 0.4rem;
}

.side-nav nav span {
  display: none;
}

.side-nav nav a {
  font-size: 0.74rem;
  line-height: 1.3;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--brown);
  opacity: 0.72;
  text-decoration: none;
  transition: opacity 180ms ease, color 180ms ease;
}

.side-nav nav a:hover,
.side-nav nav a.active {
  opacity: 1;
  color: var(--cyan);
}

.page {
  padding-left: calc(var(--side-nav-width) + 0.25rem);
}

.top-cta {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 130;
  font-size: 0.95rem;
  line-height: 1.3;
  text-decoration: underline;
}

@media (max-width: 980px) {
  .side-nav {
    position: sticky;
    top: 0;
    z-index: 120;
    width: 100%;
    height: auto;
    border-right: 0;
    border-bottom: 0;
    background: var(--orange);
  }

  .side-nav nav {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0.75rem 1rem;
    writing-mode: horizontal-tb;
    transform: none;
    display: flex;
    flex-direction: row-reverse;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    flex-wrap: wrap;
  }

  .side-nav nav span {
    display: inline;
  }

  .side-nav nav a {
    font-size: 0.9rem;
    font-weight: 400;
    letter-spacing: 0;
    text-transform: none;
    opacity: 1;
    text-decoration: underline;
  }

  .side-nav nav a.active {
    font-weight: 700;
  }

  .page {
    padding-left: 0;
  }

  .top-cta {
    position: static;
    display: block;
    text-align: right;
    padding: 0.75rem 1rem;
  }
}

@media (max-width: 560px) {
  .side-nav nav {
    justify-content: flex-end;
  }
}