:root { --background: 0 0% 100%; }

.section-navigation {
  display: flex;
  gap: 4px;
  margin-top: 40px;
  border-bottom: 1px solid hsl(var(--border));
}
.section-navigation-link {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 48px;
  padding: 12px 20px;
  color: hsl(var(--muted-foreground));
  font-size: 14px;
  font-weight: 500;
  letter-spacing: .05em;
  text-transform: uppercase;
  white-space: nowrap;
  transition: color .2s;
}
.section-navigation-link:hover,
.section-navigation-link[aria-current="page"] { color: hsl(var(--foreground)); }
.section-navigation-link[aria-current="page"]::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: hsl(var(--accent));
}
.section-navigation-link:focus-visible,
.project-link:focus-visible {
  outline: 2px solid hsl(var(--accent));
  outline-offset: 3px;
}
.vibecoding-section { padding: 40px 0; }
.vibecoding-intro { margin-bottom: 32px; }
.vibecoding-project {
  padding-bottom: 32px;
  margin-bottom: 32px;
  border-bottom: 1px solid hsl(var(--border));
}
.vibecoding-project > * + * { margin-top: 12px; }
.project-link { color: hsl(var(--accent)); overflow-wrap: anywhere; }
.project-link:hover { text-decoration: underline; text-underline-offset: 3px; }
.project-metrics { max-width: 38rem; }
.vibecoding-small-section + .vibecoding-small-section { margin-top: 32px; }
.vibecoding-small-section h2 { margin-bottom: 20px; }
.experiments-list { padding-left: 20px; list-style: disc; }
.experiments-list li + li { margin-top: 10px; }
@media (max-width: 620px) {
  .section-navigation { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 8px; }
  .section-navigation-link { padding: 12px 8px; }
}
@media (max-width: 360px) {
  .section-navigation-link { font-size: 12px; letter-spacing: .04em; }
}