/* =============================================================
   nav.css
   Sticky top navigation. Wordmark left, links right.
   Mobile: hamburger toggles a slide-down menu.
   ============================================================= */

.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  width: 100%;
  background: rgba(253, 251, 247, 0.85);
  backdrop-filter: saturate(150%) blur(10px);
  -webkit-backdrop-filter: saturate(150%) blur(10px);
  border-bottom: 1px solid var(--color-border);
}

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

.nav__brand {
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.22em;
  color: var(--color-text-primary);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 36px;
  list-style: none;
}

.nav__link {
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--color-text-primary);
  transition: color var(--transition-base);
}

.nav__link:hover {
  color: var(--color-accent);
}

.nav__cta {
  background: var(--color-accent);
  color: #fff;
  padding: 12px 20px;
  border-radius: var(--radius-button);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.02em;
  transition: background var(--transition-base);
}

.nav__cta:hover {
  background: var(--color-accent-hover);
  color: #fff;
}

/* Hamburger button (hidden on desktop) */
.nav__toggle {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
}

.nav__toggle-bars {
  position: relative;
  width: 22px;
  height: 14px;
}

.nav__toggle-bars span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 1.5px;
  background: var(--color-text-primary);
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.nav__toggle-bars span:nth-child(1) { top: 0; }
.nav__toggle-bars span:nth-child(2) { top: 50%; transform: translateY(-50%); }
.nav__toggle-bars span:nth-child(3) { bottom: 0; }

.nav.is-open .nav__toggle-bars span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}
.nav.is-open .nav__toggle-bars span:nth-child(2) {
  opacity: 0;
}
.nav.is-open .nav__toggle-bars span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* Mobile menu */
@media (max-width: 768px) {
  .nav__toggle {
    display: inline-flex;
  }

  .nav__links {
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: 16px 20px 24px;
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease, transform 0.25s ease;
  }

  .nav.is-open .nav__links {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav__links li {
    border-bottom: 1px solid var(--color-border);
  }

  .nav__links li:last-child {
    border-bottom: none;
    margin-top: 12px;
  }

  .nav__link {
    display: block;
    padding: 18px 4px;
    font-size: 16px;
  }

  .nav__cta {
    display: inline-block;
    padding: 14px 22px;
  }
}