/* ============================================================
   LAYOUT
   Contenedor centrado, ritmo vertical consistente entre
   secciones, grid de 12 columnas para las páginas que lo usen.
   ============================================================ */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.section {
  padding-block: var(--space-32);
}

.section--tight {
  padding-block: var(--space-24);
}

.section-head {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  max-width: 640px;
  margin-bottom: var(--space-16);
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--space-6);
}

@media (max-width: 900px) {
  .grid-12 {
    grid-template-columns: repeat(6, 1fr);
  }
}

@media (max-width: 560px) {
  .grid-12 {
    grid-template-columns: 1fr;
  }
}

.stack {
  display: flex;
  flex-direction: column;
}

.row {
  display: flex;
  align-items: center;
}

.gap-2 { gap: var(--space-2); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

/* ---- Header ---- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--color-bg) 85%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo-mark {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  font-weight: 500;
  letter-spacing: var(--ls-normal);
  color: var(--color-text-primary);
}

.logo-mark span {
  color: var(--color-text-tertiary);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.main-nav ul {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.main-nav a:not(.btn) {
  font-size: var(--fs-small);
  color: var(--color-text-secondary);
  transition: color var(--duration-fast) var(--ease-out);
}

.main-nav a:not(.btn):hover,
.main-nav a:not(.btn):focus-visible,
.main-nav a[aria-current="page"] {
  color: var(--color-text-primary);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 24px;
  height: 24px;
  padding: 0;
}

.nav-toggle span {
  display: block;
  height: 1.5px;
  width: 100%;
  background: var(--color-text-primary);
  transition: transform var(--duration-base) var(--ease-out), opacity var(--duration-base) var(--ease-out);
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

@media (max-width: 860px) {
  .nav-toggle {
    display: flex;
  }

  .main-nav {
    position: fixed;
    inset: 72px 0 0 0;
    background: var(--color-bg);
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-8) var(--container-pad);
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--duration-base) var(--ease-out), transform var(--duration-base) var(--ease-out);
    height: fit-content;
  }

  .main-nav[data-open="true"] {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }

  .main-nav ul {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-4);
    width: 100%;
  }

  .main-nav ul a {
    font-size: var(--fs-h3);
    font-family: var(--font-display);
  }

  .main-nav .btn {
    margin-top: var(--space-6);
  }
}

/* ---- Footer ---- */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-16);
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-8);
  padding-bottom: var(--space-12);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-8);
  flex-wrap: wrap;
}

.footer-links {
  display: flex;
  gap: var(--space-12);
  flex-wrap: wrap;
}

.footer-links ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer-links a {
  font-size: var(--fs-small);
  color: var(--color-text-secondary);
}

.footer-links a:hover,
.footer-links a:focus-visible {
  color: var(--color-text-primary);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-4);
  flex-wrap: wrap;
  font-size: var(--fs-micro);
  color: var(--color-text-tertiary);
  font-family: var(--font-mono);
}