/* Top nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: start;
  gap: var(--gap-md);
  padding: 18px var(--pad-x);
  background: var(--bg);
  color: var(--fg);
  /* H3 */
  font-family: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 16px;
  font-weight: 600;
  line-height: 140%;
  letter-spacing: -0.64px;
}
.nav__brand {
  max-width: 28ch;
  letter-spacing: 0.01em;
}
.nav__center {
  display: flex;
  gap: clamp(20px, 3vw, 56px);
  justify-content: center;
}
.nav__right {
  justify-self: end;
  display: flex;
  gap: var(--gap-md);
  align-items: center;
}
.nav a {
  position: relative;
  padding: 2px 0;
  transition: opacity var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}
.nav a:hover { color: #C8FFAE; }
body[data-theme="about"] .nav a:hover { color: #8473C8; }
.nav a::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 1px;
  background: currentColor;
  transform-origin: right;
  transform: scaleX(0);
  transition: transform var(--dur) var(--ease);
}
.nav a:hover::after, .nav a.is-active::after {
  transform-origin: left;
  transform: scaleX(1);
}
.nav a.is-active { opacity: 1; }
.nav .ext::after { display: none; }
.nav .ext .arrow {
  display: inline-block;
  vertical-align: baseline;
  margin-left: 4px;
  width: 12px;
  height: 12px;
  transition: transform var(--dur) var(--ease);
}
.nav .ext:hover .arrow { transform: translate(2px, -2px); }

/* Mobile nav: stack */
@media (max-width: 640px) {
  .nav {
    grid-template-columns: 1fr auto;
    grid-template-areas: "center right";
  }
  .nav__brand { display: none; }
  .nav__right { grid-area: right; }
  .nav__center { grid-area: center; justify-content: flex-start; gap: 24px; }
}

/* Footer */
/* Footer — edge-to-edge; fade stripes from page into solid block */
.foot {
  margin-top: 0;
  background: transparent;
  position: relative;
  z-index: 3;
  color: #FFE9D2;
  font-family: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 16px;
  font-weight: 400;
  line-height: 140%;
  letter-spacing: -0.64px;
}
.foot__fade {
  display: block;
  width: 100%;
  height: auto;
}
.foot__block {
  background: #1D030E;
  padding: 200px 40px 40px;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 24px;
  flex-wrap: wrap;
}
.foot__block > span { color: #FFE9D2; }

@media (max-width: 640px) {
  .foot__block { padding: 120px 20px 24px; }
}