.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  padding-block: var(--space-5);
  background: linear-gradient(to right, var(--color-white) 30%, var(--color-surface) 100%);
  transition: padding var(--transition-base), box-shadow var(--transition-base);
}

.nav--scrolled {
  padding-block: var(--space-4);
  box-shadow: 0 1px 16px rgba(0,0,0,0.1);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
}

.nav__logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.nav__logo img,
.nav__logo svg {
  height: var(--nav-logo-h);
  width: auto;
}

.nav__menu {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav__link {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: var(--fw-medium);
  color: rgba(26,26,25,0.65);
  letter-spacing: 0.02em;
  transition: color var(--transition-fast);
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-yellow);
  transition: width var(--transition-base);
}

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

.nav__link:hover::after,
.nav__link--active::after {
  width: 100%;
}

.nav__cta {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: var(--fw-semibold);
  color: var(--color-black);
  background-color: var(--color-yellow);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast), transform var(--transition-fast);
  white-space: nowrap;
}

.nav__cta:hover {
  background-color: var(--color-yellow-dark);
  transform: translateY(-1px);
}

/* Hamburger */
.nav__hamburger {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 28px;
  height: 20px;
  padding: 0;
  z-index: var(--z-overlay);
}

.nav__hamburger-line {
  display: block;
  height: 2px;
  background-color: var(--color-black);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
  transform-origin: center;
}

.nav__hamburger--open .nav__hamburger-line:nth-child(1) {
  transform: translateY(9px) rotate(45deg);
}
.nav__hamburger--open .nav__hamburger-line:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.nav__hamburger--open .nav__hamburger-line:nth-child(3) {
  transform: translateY(-9px) rotate(-45deg);
}

/* Mobile */
@media (max-width: 767px) {
  /* Nav expande para 100dvh quando o menu está aberto.
     position:fixed dentro de position:fixed quebra no Safari iOS —
     por isso o menu usa position:absolute dentro da nav expandida. */
  .nav {
    overflow: hidden;
  }

  .nav--menu-open {
    height: 100dvh;
  }

  .nav__hamburger {
    display: flex;
    position: relative;
    z-index: 2;
  }

  .nav__menu {
    position: absolute;
    inset: 0;
    z-index: 1;
    background-color: var(--color-black);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: var(--space-10);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-base);
  }

  .nav__menu--open {
    opacity: 1;
    pointer-events: auto;
  }

  .nav__link {
    font-size: var(--text-xl);
    color: rgba(255,255,255,0.75);
  }

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

  .nav__cta {
    font-size: var(--text-base);
    padding: var(--space-4) var(--space-8);
  }
}