/* =========================================================================
   layout.css — Contenedores, secciones y retícula de 12 columnas.
   ========================================================================= */

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

.container--wide {
  max-width: var(--container-wide);
}

.container--reading {
  max-width: var(--container-reading);
}

/* Secciones con ritmo vertical */
.section {
  padding-block: var(--section-y);
}

.section--tight {
  padding-block: calc(var(--section-y) * 0.6);
}

.section--flush-top {
  padding-top: 0;
}

/* Fondos de sección para alternar ritmo visual */
.bg-white { background: var(--color-surface); }
.bg-soft { background: var(--color-surface-2); }
.bg-tint { background: var(--color-surface-3); }
.bg-deep {
  background: var(--color-deep-blue);
  color: var(--color-on-dark);
}
.bg-gradient {
  background: var(--gradient-brand-135);
  color: var(--color-on-dark);
}

.bg-deep h1, .bg-deep h2, .bg-deep h3, .bg-deep h4,
.bg-gradient h1, .bg-gradient h2, .bg-gradient h3, .bg-gradient h4 {
  color: var(--color-on-dark);
}

/* Retícula de 12 columnas */
.grid {
  display: grid;
  gap: var(--space-xl);
}

.grid--12 {
  grid-template-columns: repeat(12, 1fr);
}

.grid--auto {
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 17rem), 1fr));
}

.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

/* Split editorial asimétrico */
.split {
  display: grid;
  gap: clamp(2rem, 1rem + 4vw, 5rem);
  align-items: center;
}

@media (min-width: 900px) {
  .split {
    grid-template-columns: 1.05fr 0.95fr;
  }
  .split--reverse > :first-child { order: 2; }
}

/* Encabezado de sección */
.section-head {
  max-width: 60ch;
  margin-bottom: clamp(2rem, 1.2rem + 2vw, 3.5rem);
}

.section-head--center {
  margin-inline: auto;
  text-align: center;
}

.section-head p {
  margin-top: var(--space-md);
  font-size: var(--fs-lead);
  color: var(--color-ink-soft);
}

.bg-deep .section-head p,
.bg-gradient .section-head p {
  color: var(--color-on-dark-soft);
}

/* Utilidades de flujo */
.stack > * + * { margin-top: var(--space-md); }
.stack-lg > * + * { margin-top: var(--space-xl); }

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

.lead {
  font-size: var(--fs-lead);
  line-height: var(--lh-snug);
  color: var(--color-ink-soft);
}

@media (max-width: 768px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
}