nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 48px;
}

.nav-logo {
  font-family: var(--serif);
  font-size: 22px;
  letter-spacing: -.02em;
  color: var(--ink);
  text-decoration: none;
  opacity: 0;
  animation: fadeIn 1s .5s forwards;
}

.nav-links {
  display: flex;
  gap: 40px;
  list-style: none;
}

.nav-links a {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--ink);
  text-decoration: none;
  opacity: 0;
  animation: fadeIn 1s forwards;
  transition: color .3s;
}

.nav-links li:nth-child(1) a { animation-delay: .7s; }
.nav-links li:nth-child(2) a { animation-delay: .85s; }
.nav-links li:nth-child(3) a { animation-delay: 1s; }
.nav-links li:nth-child(4) a { animation-delay: 1.15s; }

.nav-links a:hover { color: var(--accent); }

/* ── Burger button ──────────────────────────────── */
.nav-burger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  color: var(--ink);
  width: 32px;
  height: 24px;
  opacity: 0;
  animation: fadeIn 1s 1.2s forwards;
}

/* ── Mobile overlay ─────────────────────────────── */
.nav-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: var(--ink);
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 48px 40px;
  clip-path: polygon(100% 0, 100% 0, 100% 0, 100% 0);
  transition: clip-path 0.55s cubic-bezier(0.76, 0, 0.24, 1);
  pointer-events: none;
}

.nav-overlay.is-open {
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: all;
}

/* Close button */
.nav-close {
  position: absolute;
  top: 24px;
  right: 24px;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--paper);
  width: 32px;
  height: 32px;
  padding: 4px;
  opacity: 0;
  transition: opacity 0.3s;
}

.nav-overlay.is-open .nav-close {
  opacity: 1;
  transition-delay: 0.4s;
}

.close-line {
  stroke-dasharray: 30;
  stroke-dashoffset: 30;
  transition: stroke-dashoffset 0.4s ease;
}

.nav-overlay.is-open .close-line {
  stroke-dashoffset: 0;
  transition-delay: 0.45s;
}

/* Links */
.overlay-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.overlay-link {
  display: flex;
  align-items: baseline;
  gap: 16px;
  font-family: var(--serif);
  font-size: clamp(28px, 8vw, 40px);
  color: var(--paper);
  text-decoration: none;
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.4s, transform 0.4s;
}

.overlay-link:nth-child(1) { padding-left: 0;    transition-delay: 0.3s; }
.overlay-link:nth-child(2) { padding-left: 24px;  transition-delay: 0.38s; }
.overlay-link:nth-child(3) { padding-left: 48px;  transition-delay: 0.46s; }
.overlay-link:nth-child(4) { padding-left: 72px;  transition-delay: 0.54s; }

.nav-overlay.is-open .overlay-link {
  opacity: 1;
  transform: translateY(0);
}

.overlay-link:hover { color: var(--trace); }

.overlay-num {
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--trace);
  flex-shrink: 0;
}

/* Diagonal axis */
.overlay-axis {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

/* ── Responsive: show burger on mobile ──────────── */
@media (max-width: 768px) {
  .nav-links  { display: none; }
  .nav-burger { display: block; }
}