/* ── Navigation — clean light theme ───────────── */

.nav {
  position: sticky;
  top: 0;
  z-index: 200;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition);
}

.nav.scrolled {
  box-shadow: 0 2px 24px rgba(31, 31, 31, 0.09);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

/* Logo */
.nav__logo {
  display: flex;
  align-items: center;
}

.nav__logo-img {
  height: 72px;
  width: auto;
  display: block;
}

/* Links */
.nav__links {
  display: flex;
  align-items: center;
  gap: 2.5rem;
}

.nav__link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-muted);
  transition: color var(--transition);
  letter-spacing: 0.01em;
}

.nav__link:hover,
.nav__link.active {
  color: var(--color-text-primary);
}

/* Actions */
.nav__actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* ── Hamburger button ─────────────────────────── */
.nav__hamburger {
  display: none;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  color: var(--color-text-primary);
  transition: background var(--transition);
}

.nav__hamburger:hover {
  background: var(--color-cream);
}

.nav__bar {
  transform-origin: center;
  transition: transform 300ms cubic-bezier(.5, .85, .25, 1.1);
}

.nav__bar--top { transform: translateY(-7px); }
.nav__bar--bot { transform: translateY(7px); }

.nav__hamburger[aria-expanded="true"] .nav__bar--top {
  transform: translateY(0) rotate(315deg);
}
.nav__hamburger[aria-expanded="true"] .nav__bar--mid {
  transform: rotate(45deg);
  transition-timing-function: cubic-bezier(.5, .85, .25, 1.8);
}
.nav__hamburger[aria-expanded="true"] .nav__bar--bot {
  transform: translateY(0) rotate(135deg);
}

/* Drawer CTA — hidden on desktop */
.nav__drawer-cta { display: none; }

/* Backdrop — hidden on desktop */
.nav__backdrop { display: none; }

/* ── Mobile ───────────────────────────────────── */
@media (max-width: 768px) {
  .nav__cta { display: none; }
  .nav__hamburger { display: flex; }

  /* Slide-in drawer */
  .nav__links {
    position: fixed;
    top: 72px;
    right: 0;
    bottom: 0;
    width: min(300px, 82vw);
    background: var(--color-surface);
    border-left: 1px solid var(--color-border);
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    padding: 1.5rem;
    z-index: 200;
    transform: translateX(100%);
    transition: transform 300ms cubic-bezier(.4, 0, .2, 1);
    overflow-y: auto;
  }

  .nav__links.open { transform: translateX(0); }

  /* Staggered links */
  .nav__link {
    font-size: 1.125rem;
    padding: 1rem 0;
    border-bottom: 1px solid var(--color-border);
    opacity: 0;
    transform: translateX(16px);
    transition: opacity 220ms ease, transform 220ms ease, color var(--transition);
  }

  .nav__links.open .nav__link:nth-child(1) { opacity: 1; transform: translateX(0); transition-delay: 60ms; }
  .nav__links.open .nav__link:nth-child(2) { opacity: 1; transform: translateX(0); transition-delay: 100ms; }
  .nav__links.open .nav__link:nth-child(3) { opacity: 1; transform: translateX(0); transition-delay: 140ms; }
  .nav__links.open .nav__link:nth-child(4) { opacity: 1; transform: translateX(0); transition-delay: 180ms; }

  /* Drawer CTA */
  .nav__drawer-cta {
    display: inline-flex;
    margin-top: 1.5rem;
    text-align: center;
    justify-content: center;
    opacity: 0;
    transform: translateX(16px);
    transition: opacity 220ms ease, transform 220ms ease;
  }

  .nav__links.open .nav__drawer-cta {
    opacity: 1;
    transform: translateX(0);
    transition-delay: 220ms;
  }

  /* Dimmed backdrop */
  .nav__backdrop {
    display: block;
    position: fixed;
    inset: 72px 0 0 0;
    background: rgba(31, 31, 31, 0.45);
    backdrop-filter: blur(3px);
    -webkit-backdrop-filter: blur(3px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 300ms ease;
    z-index: 199;
  }

  .nav__backdrop.open {
    opacity: 1;
    pointer-events: all;
  }
}