/* ── Nav ─────────────────────────────────────────────────── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  transition: background-color var(--transition-base), box-shadow var(--transition-base);
}

/* Subtle shadow when scrolled */
.nav.is-scrolled {
  background-color: rgba(10, 10, 10, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 var(--color-border);
}

.nav__inner {
  display: flex;
  align-items: center;
  height: 72px;
  gap: var(--space-6);
}

.nav__brand {
  font-size: 0.9375rem;
  font-weight: var(--font-weight-semibold);
  color: var(--color-teal);
  flex-shrink: 0;
  letter-spacing: var(--letter-spacing-wide);
}
.nav__brand:hover { color: #00c9b3; }

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  margin-left: var(--space-10);
}

.nav__links a {
  font-size: var(--font-size-base);
  color: var(--color-gray);
  transition: color var(--transition-fast);
}
.nav__links a:hover { color: var(--color-white); }

.nav__cta {
  margin-left: auto;
  padding: 0.5625rem 1.25rem;
}

/* Hamburger — hidden on desktop */
.nav__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 28px;
  height: 28px;
  background: none;
  border: none;
  cursor: pointer;
  margin-left: auto;
  padding: 0;
}
.nav__hamburger span {
  display: block;
  width: 100%;
  height: 1.5px;
  background-color: var(--color-light);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}
.nav__hamburger[aria-expanded="true"] span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav__hamburger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav__hamburger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* Mobile menu */
.nav__mobile {
  display: none;
  overflow: hidden;
  max-height: 0;
  transition: max-height var(--transition-slow);
  border-top: 1px solid var(--color-border);
}
.nav__mobile.is-open {
  max-height: 320px;
}
.nav__mobile ul {
  display: flex;
  flex-direction: column;
  padding: var(--space-4) var(--container-pad) var(--space-6);
  gap: var(--space-4);
}
.nav__mobile a {
  font-size: var(--font-size-md);
  color: var(--color-gray);
}
.nav__mobile a:hover { color: var(--color-white); }
.nav__mobile .btn { align-self: flex-start; margin-top: var(--space-2); }

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