/* ============================================================
   Synergy Dynamics Balance — Layout
   Secciones · Grid · Navegación · Footer
   ============================================================ */

/* ──────────── SECCIONES ──────────── */
.section {
  padding: var(--section-py) var(--section-px);
  max-width: var(--max-width);
  margin: 0 auto;
}
.section-narrow { max-width: var(--max-width-text); }
.section-wide { max-width: var(--max-width-wide); }

.section-alt { background: var(--color-bg-alt); }
.section-primary-soft { background: var(--color-primary-light); }
.section-accent-soft { background: var(--color-accent-light); }

.section-dark {
  background: var(--color-bg-dark);
  color: var(--color-text-inverse);
}
.section-dark h1, .section-dark h2, .section-dark h3 { color: var(--color-text-inverse); }
.section-dark .card-text, .section-dark .lead { color: rgba(250,250,248,0.78); }

.section-band {
  background: var(--color-primary);
  color: #fff;
}
.section-band h1, .section-band h2, .section-band h3 { color: #fff; }

.section-header { max-width: var(--max-width-text); margin-bottom: var(--space-12); }
.section-header.center { margin-left: auto; margin-right: auto; text-align: center; }
.section-title { margin-bottom: var(--space-4); }
.section-sub { font-size: var(--text-md); color: var(--color-text-muted); line-height: 1.6; }

/* ──────────── GRID UTILITIES ──────────── */
.grid { display: grid; gap: var(--space-6); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-gap-lg { gap: var(--space-8); }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }

.cta-group { display: flex; gap: var(--space-4); flex-wrap: wrap; }
.text-center { text-align: center; }
.mx-auto { margin-left: auto; margin-right: auto; }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mt-12 { margin-top: var(--space-12); }

/* Split de dos columnas */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
}
.split-40-60 { grid-template-columns: 40% 1fr; }
.split-60-40 { grid-template-columns: 1fr 40%; }

/* ──────────── NAVEGACIÓN ──────────── */
.nav-header {
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
  background: rgba(250,250,248,0.85);
  backdrop-filter: saturate(140%) blur(12px);
  -webkit-backdrop-filter: saturate(140%) blur(12px);
  border-bottom: 1px solid transparent;
  transition: box-shadow var(--transition), border-color var(--transition), background var(--transition);
}
.nav-header.scrolled {
  box-shadow: var(--shadow-sm);
  border-color: var(--color-border);
  background: rgba(250,250,248,0.95);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  max-width: var(--max-width-wide);
  margin: 0 auto;
  padding: var(--space-4) var(--space-6);
}

.nav-logo { display: flex; align-items: center; flex-shrink: 0; }
.nav-logo img, .nav-logo svg { height: 40px; width: auto; }

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  margin-left: auto;
}
.nav-links > li > a, .nav-dropdown > button {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
  background: none;
  border: none;
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) 0;
  position: relative;
}
.nav-links > li > a::after, .nav-dropdown > button::after {
  content: "";
  position: absolute;
  left: 0; bottom: -2px;
  width: 0; height: 2px;
  background: var(--color-primary);
  transition: width var(--transition);
}
.nav-links > li > a:hover::after, .nav-dropdown:hover > button::after { width: 100%; }
.nav-links > li > a:hover, .nav-dropdown > button:hover { color: var(--color-primary-dark); }

/* Dropdown */
.nav-dropdown { position: relative; }
.nav-dropdown > button::before {
  content: "";
  width: 0; height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid currentColor;
  margin-left: var(--space-1);
  order: 2;
  transition: transform var(--transition);
}
.nav-dropdown-menu {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  min-width: 250px;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: var(--space-3);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
}
.nav-dropdown:hover .nav-dropdown-menu,
.nav-dropdown.open .nav-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(4px);
}
.nav-dropdown-menu a {
  display: block;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
}
.nav-dropdown-menu a:hover { background: var(--color-primary-xlight); color: var(--color-primary-dark); }

.nav-cta { display: flex; align-items: center; gap: var(--space-4); flex-shrink: 0; }
.nav-lang {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-pill);
  padding: var(--space-1) var(--space-3);
}
.nav-lang:hover { border-color: var(--color-primary); color: var(--color-primary-dark); }

/* Hamburger */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  padding: var(--space-2);
}
.nav-hamburger span {
  display: block;
  width: 24px; height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}
.nav-hamburger[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-hamburger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-hamburger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Nav simplificado (landing pages) */
.nav-minimal .nav-links, .nav-minimal .nav-hamburger { display: none; }
.nav-minimal .nav-back { font-size: var(--text-sm); font-weight: 500; color: var(--color-text-muted); }
.nav-minimal .nav-back:hover { color: var(--color-primary-dark); }

/* Mobile menu overlay */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  background: var(--color-bg);
  padding: var(--space-20) var(--space-6) var(--space-6);
  transform: translateX(100%);
  transition: transform var(--transition-slow);
  overflow-y: auto;
}
.mobile-menu.open { transform: translateX(0); }
.mobile-menu ul { display: flex; flex-direction: column; gap: var(--space-2); }
.mobile-menu a, .mobile-menu .mobile-group-label {
  display: block;
  padding: var(--space-4) 0;
  font-size: var(--text-md);
  font-weight: 500;
  color: var(--color-text);
  border-bottom: 1px solid var(--color-border);
}
.mobile-menu .mobile-group-label { color: var(--color-text-subtle); font-size: var(--text-sm); text-transform: uppercase; letter-spacing: 0.08em; }
.mobile-menu .mobile-sub a { padding-left: var(--space-5); font-size: var(--text-base); border: none; }
.mobile-menu .mobile-cta { margin-top: var(--space-6); }

/* ──────────── FOOTER ──────────── */
.footer { background: var(--color-bg-dark); color: var(--color-text-inverse); }
.footer-top {
  display: grid;
  grid-template-columns: 1.2fr 2fr;
  gap: var(--space-16);
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-20) var(--space-6) var(--space-12);
}
.footer-brand img, .footer-brand svg { height: 44px; margin-bottom: var(--space-4); }
.footer-brand p { color: rgba(250,250,248,0.7); font-size: var(--text-sm); max-width: 280px; margin-bottom: var(--space-6); }
.footer-social { display: flex; gap: var(--space-3); }
.footer-social a {
  width: 40px; height: 40px;
  display: grid; place-items: center;
  border-radius: var(--radius-pill);
  background: rgba(255,255,255,0.08);
  color: var(--color-text-inverse);
  transition: background var(--transition);
}
.footer-social a:hover { background: var(--color-primary); color: #fff; }
.footer-social svg { width: 20px; height: 20px; }

.footer-nav { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-8); }
.footer-col h4 { font-size: var(--text-sm); text-transform: uppercase; letter-spacing: 0.08em; color: rgba(250,250,248,0.55); margin-bottom: var(--space-4); }
.footer-col ul { display: flex; flex-direction: column; gap: var(--space-3); }
.footer-col a { color: rgba(250,250,248,0.82); font-size: var(--text-sm); }
.footer-col a:hover { color: #fff; }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.footer-bottom p { font-size: var(--text-xs); color: rgba(250,250,248,0.55); line-height: 1.6; }
.footer-bottom strong { color: rgba(250,250,248,0.75); }

/* ──────────── RESPONSIVE ──────────── */
@media (max-width: 900px) {
  :root { --section-py: var(--space-16); }
  .nav-links, .nav-cta .nav-lang, .nav-cta .btn { display: none; }
  .nav-hamburger { display: flex; }
  .split, .split-40-60, .split-60-40 { grid-template-columns: 1fr; gap: var(--space-10); }
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-top { grid-template-columns: 1fr; gap: var(--space-10); }
}

@media (max-width: 600px) {
  :root { --section-px: var(--space-5); }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .footer-nav { grid-template-columns: 1fr 1fr; }
  .cta-group { flex-direction: column; }
  .cta-group .btn { width: 100%; }
}