/* ============================================================
   02-nav.css · Navegación sticky
   ============================================================ */

.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0);
  backdrop-filter: blur(0px);
  transition: background var(--t-med), backdrop-filter var(--t-med), border-color var(--t-med);
  border-bottom: 1px solid transparent;
}

.nav.is-scrolled {
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom-color: var(--color-line);
}

.nav__inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.nav__logo-img {
  width: 36px;
  height: 36px;
  object-fit: contain;
}

.nav__logo-text {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--color-ink);
}

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

.nav__links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-ink-soft);
  transition: color var(--t-fast);
  position: relative;
}

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

.nav__links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1.5px;
  background: var(--color-accent);
  transition: width var(--t-fast);
}

.nav__links a:hover::after {
  width: 100%;
}

.nav__cta {
  padding: 10px 20px;
  background: var(--color-accent);
  color: var(--color-dominant);
  font-size: 13px;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--t-fast);
}

.nav__cta:hover {
  background: var(--color-accent-2);
  transform: translateY(-1px);
}

/* ── Burger ── */
.nav__burger {
  display: none;
  width: 36px;
  height: 36px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  cursor: pointer;
  z-index: 102;
  position: relative;
}
.nav__burger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-ink);
  transition: transform var(--t-fast), opacity var(--t-fast);
  transform-origin: center;
}
.nav__burger[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav__burger[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.nav__burger[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ── Menú overlay móvil fullscreen ── */
.nav__overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--color-dominant);
  z-index: 101;
  padding: calc(var(--nav-h) + var(--space-md)) var(--container-pad) var(--space-lg);
  flex-direction: column;
  gap: var(--space-md);
  opacity: 0;
  transform: translateY(-12px);
  transition: opacity var(--t-med), transform var(--t-med);
  pointer-events: none;
}
.nav__overlay.is-open {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.nav__overlay a {
  font-size: clamp(1.6rem, 6vw, 2.2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-ink);
  padding: var(--space-xs) 0;
  border-bottom: 1px solid var(--color-line);
}
.nav__overlay a:last-child {
  color: var(--color-accent);
  border-bottom: none;
  margin-top: var(--space-md);
}

/* ── Mobile breakpoint ── */
@media (max-width: 900px) {
  .nav__links, .nav__cta { display: none; }
  .nav__burger { display: flex; }
  .nav__overlay { display: flex; }
}

/* Block scroll cuando overlay abierto */
body.nav-open {
  overflow: hidden;
}