/* ============================================================
   05-nav.css — Top navigation corporativa
   ============================================================ */

.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  transition: background var(--dur-base), border-color var(--dur-base), box-shadow var(--dur-base);
  border-bottom: 1px solid transparent;
  background: rgba(248, 246, 240, 0.0);
}

.nav.is-scrolled {
  background: var(--surface-frosted);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  border-bottom-color: var(--line);
  box-shadow: var(--shadow-sm);
}

.nav__inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: var(--space-6);
  align-items: center;
  padding-block: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav__links {
  display: flex;
  gap: var(--space-6);
  justify-content: center;
  font-family: var(--font-ui);
  font-size: 14px;
  font-weight: 500;
  color: var(--ink-soft);
}
.nav__links a {
  padding: 10px 8px;
  position: relative;
  transition: color var(--dur-fast);
}
.nav__links a::after {
  content: "";
  position: absolute;
  inset: auto 0 -4px 0;
  height: 2px;
  background: var(--orange-500);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-base) var(--ease-out);
  border-radius: 2px;
}
.nav__links a:hover { color: var(--navy-900); }
.nav__links a:hover::after { transform: scaleX(1); }

.nav__cta {
  display: flex;
  gap: var(--space-3);
  align-items: center;
}

.nav__burger {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--bg-soft);
  position: relative;
}
.nav__burger span {
  position: absolute;
  inset: 50% 25% auto 25%;
  height: 2px;
  background: var(--navy-900);
  transform: translateY(-50%);
  border-radius: 2px;
  transition: transform var(--dur-base) var(--ease-out), opacity var(--dur-fast);
}
.nav__burger span:nth-child(1) { transform: translateY(calc(-50% - 5px)); }
.nav__burger span:nth-child(3) { transform: translateY(calc(-50% + 5px)); }

.nav__burger.is-open span:nth-child(1) { transform: translateY(-50%) rotate(45deg); }
.nav__burger.is-open span:nth-child(2) { opacity: 0; }
.nav__burger.is-open span:nth-child(3) { transform: translateY(-50%) rotate(-45deg); }

@media (max-width: 1000px) {
  .nav__inner {
    display: flex;
  justify-content: space-between;
  align-items: center;
  }
  .nav__links { display: none; }
  .nav__links.is-open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    inset-inline: 0;
    background: var(--surface-frosted-heavy);
    backdrop-filter: blur(18px) saturate(140%);
    -webkit-backdrop-filter: blur(18px) saturate(140%);
    border-bottom: 1px solid var(--line);
    padding: var(--space-5) var(--gutter);
    gap: var(--space-4);
    box-shadow: var(--shadow-md);
    z-index: 99;
  }
  .nav__burger { display: block; }
}

@media (max-width: 600px) {
  .nav__cta .btn { padding: 10px 14px; font-size: 12px; }
  .nav__cta .btn--ghost { display: none; }
}