/* ============================================================
   QUÍMICOS FUNCIONALES — nav.css
   ============================================================ */

/* ===== HEADER ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  height: var(--header-height);
  transition: background var(--transition-slow), box-shadow var(--transition-slow), backdrop-filter var(--transition-slow);
}

.site-header.scrolled {
  background: rgba(14, 29, 59, 0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 rgba(255,255,255,0.06), var(--shadow-md);
}

.site-header:not(.scrolled) {
  background: linear-gradient(to bottom, rgba(14,29,59,0.85) 0%, transparent 100%);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  padding-inline: var(--container-px);
  max-width: var(--container-max);
  margin-inline: auto;
}

/* ===== LOGO ===== */
.nav-logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  transition: opacity var(--transition-fast);
}

.nav-logo:hover {
  opacity: 0.85;
}

.nav-logo img {
  height: 38px;
  width: auto;
}

/* ===== DESKTOP LINKS ===== */
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav-link {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.75);
  transition: color var(--transition-fast);
  padding-bottom: 2px;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-orange);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
  border-radius: 1px;
}

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

.nav-link:hover::after,
.nav-link.active::after {
  transform: scaleX(1);
}

.nav-num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-orange);
  margin-right: 2px;
  font-weight: 400;
  line-height: 1;
  align-self: flex-end;
  padding-bottom: 1px;
}

/* ===== CTA BUTTON ===== */
.nav-cta {
  display: inline-flex;
  align-items: center;
  padding: 0.5em 1.25em;
  background: var(--color-orange);
  color: var(--color-white) !important;
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.nav-cta:hover {
  background: var(--color-orange-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-orange);
}

/* ===== MOBILE TOGGLE ===== */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: flex-end;
  gap: 5px;
  width: 32px;
  height: 32px;
  cursor: pointer;
  z-index: var(--z-overlay);
}

.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--color-white);
  border-radius: 1px;
  transition: all 0.3s var(--ease-out);
  transform-origin: right;
}

.nav-toggle span:nth-child(1) { width: 28px; }
.nav-toggle span:nth-child(2) { width: 20px; }
.nav-toggle span:nth-child(3) { width: 24px; }

.nav-toggle.active span:nth-child(1) {
  transform: rotate(-45deg) scaleX(0.8);
  width: 28px;
}
.nav-toggle.active span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.nav-toggle.active span:nth-child(3) {
  transform: rotate(45deg) scaleX(0.8);
  width: 28px;
}

/* ===== MOBILE MENU ===== */
.mobile-menu {
  position: fixed;
  inset: 0;
  background: var(--color-navy);
  z-index: var(--z-modal);
  display: flex;
  flex-direction: column;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.4s var(--ease-out), visibility 0.4s;
  overflow: hidden;
}

.mobile-menu::before {
  content: '';
  position: absolute;
  top: -20%;
  right: -10%;
  width: 60vw;
  height: 60vw;
  background: radial-gradient(circle, rgba(244,98,31,0.12) 0%, transparent 70%);
  pointer-events: none;
}

.mobile-menu.open {
  opacity: 1;
  visibility: visible;
  pointer-events: all;
}

.mobile-menu-inner {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: var(--space-6) var(--space-8);
}

.mobile-logo {
  padding-top: calc(var(--header-height) - var(--space-6));
  margin-bottom: var(--space-12);
}

.mobile-logo img {
  height: 36px;
}

.mobile-nav {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: var(--space-2);
}

.mobile-nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4) 0;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  transform: translateX(-30px);
  opacity: 0;
  transition: transform 0.4s var(--ease-out), opacity 0.4s var(--ease-out), color var(--transition-fast);
}

.mobile-menu.open .mobile-nav-link {
  transform: translateX(0);
  opacity: 1;
}

.mobile-menu.open .mobile-nav-link:nth-child(1) { transition-delay: 0.05s; }
.mobile-menu.open .mobile-nav-link:nth-child(2) { transition-delay: 0.1s; }
.mobile-menu.open .mobile-nav-link:nth-child(3) { transition-delay: 0.15s; }
.mobile-menu.open .mobile-nav-link:nth-child(4) { transition-delay: 0.2s; }

.mobile-nav-num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-orange);
  min-width: 28px;
}

.mobile-nav-text {
  font-family: var(--font-display);
  font-size: clamp(var(--text-3xl), 6vw, var(--text-5xl));
  font-weight: 900;
  color: rgba(255,255,255,0.85);
  letter-spacing: 0.02em;
  text-transform: uppercase;
  transition: color var(--transition-fast);
}

.mobile-nav-link:hover .mobile-nav-text {
  color: var(--color-orange);
}

.mobile-footer {
  padding-top: var(--space-8);
  padding-bottom: var(--space-4);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.mobile-footer p,
.mobile-footer a {
  font-size: var(--text-xs);
  color: rgba(255,255,255,0.35);
}

.mobile-footer a:hover {
  color: var(--color-white);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1023px) {
  .nav-links {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }
}

@media (min-width: 1024px) {
  .mobile-menu {
    display: none;
  }
}