/* ==========================================================================
   ZOONARANJA — Layout estructural de secciones
   ========================================================================== */

section { position: relative; }

.section-padding { padding: 4rem 0; }
.section-padding-sm { padding: 3rem 0; }

/* ---- Progress bar superior ---- */
#scroll-progress {
  position: fixed;
  top: 0; left: 0;
  width: 100%;
  height: 4px;
  z-index: var(--z-progress);
  background: transparent;
  pointer-events: none;
}
#scroll-progress .bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--turquoise), var(--orange));
  box-shadow: 0 0 12px rgba(255,122,48,0.6);
  transform-origin: left;
}

/* ---- Header / Navegación ---- */
#site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: var(--z-nav);
  height: var(--nav-height);
  display: flex;
  align-items: center;
  transition: background var(--dur-base) var(--ease-soft), box-shadow var(--dur-base) var(--ease-soft), height var(--dur-base) var(--ease-soft);
}
#site-header .nav-inner {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 5vw, 3rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
}
#site-header.scrolled {
  height: 68px;
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  box-shadow: var(--shadow-sm);
  border-bottom: 1px solid var(--glass-border);
}

.nav-logo img { height: 34px; width: auto; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}
.nav-links a {
  position: relative;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--turquoise-light);
  padding: 0.4rem 0;
}
#site-header.scrolled .nav-links a { color: var(--ink-700); }
.nav-links a::after {
  content: '';
  position: absolute;
  left: 0; bottom: -2px;
  height: 2px; width: 0;
  background: var(--grad-warm);
  transition: width var(--dur-fast) var(--ease-soft);
  border-radius: var(--radius-full);
}
.nav-links a:hover::after,
.nav-links a.active::after { width: 100%; }

.nav-actions { display: flex; align-items: center; gap: var(--space-sm); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}
.nav-toggle span {
  width: 24px; height: 2px;
  background: var(--ink-800);
  border-radius: var(--radius-full);
  transition: transform var(--dur-fast) var(--ease-soft), opacity var(--dur-fast) var(--ease-soft);
}
.nav-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}
.nav-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---- Mobile menu ---- */
.mobile-menu {
  position: fixed;
  top: calc(var(--nav-height) + 0.75rem);
  left: 1rem;
  right: 1rem;
  background: var(--white);
  z-index: calc(var(--z-nav) - 1);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.5rem;
  transform: translateY(-12px);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--dur-fast) var(--ease-soft), transform var(--dur-fast) var(--ease-soft), visibility var(--dur-fast);
  padding: 0.75rem;
  border: 1px solid rgba(11, 110, 140, 0.12);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
}
.mobile-menu.open {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}
.mobile-menu a {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.7rem 0.75rem;
  border-radius: var(--radius-sm);
  background: var(--off-white);
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
}

/* ---- Grids reutilizables ---- */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-lg); align-items: center; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-md); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-md); }
.grid-auto { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: var(--space-md); }

.section-head {
  max-width: 720px;
  margin-bottom: 2rem;
}
.section-head.centered { margin-left: auto; margin-right: auto; text-align: center; }

/* ---- Botón volver arriba ---- */
#back-to-top {
  position: fixed;
  bottom: 28px;
  left: 28px;
  z-index: 800;
  width: 48px; height: 48px;
  border-radius: 50%;
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--blue-vet);
  box-shadow: var(--shadow-sm);
  opacity: 0;
  pointer-events: none;
  transform: translateY(20px);
  transition: opacity var(--dur-fast), transform var(--dur-fast);
}
#back-to-top.visible { opacity: 1; pointer-events: auto; transform: translateY(0); }

/* ---- Pet companion track (perro y gato en scroll) ---- */
#pet-companion-track {
  position: fixed;
  bottom: 0; left: 0;
  width: 100%;
  height: 90px;
  z-index: var(--z-companion);
  pointer-events: none;
  overflow: hidden;
}

@media (max-width: 1024px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 860px) {
  .nav-links { display: none; }
  .nav-toggle { display: flex; }
  .grid-2 { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .grid-3, .grid-4 { grid-template-columns: 1fr; }
  #back-to-top { bottom: 90px; left: 16px; width: 42px; height: 42px; }
}