*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

.btn-back {
  background: transparent;
  border: 1px solid var(--border, #30363d);
  border-radius: 6px;
  color: var(--muted, #8b949e);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.35rem 0.75rem;
  text-decoration: none;
  transition: border-color 0.15s, color 0.15s;
}
.btn-back:hover {
  border-color: var(--accent, #ff5e3a);
  color: var(--accent, #ff5e3a);
}