/* ==========================================================================
   Layout — Container, Grid, Section Classes
   ========================================================================== */

/* Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

/* Section */
.section {
  padding: var(--section-padding) 0;
}

.section--alt {
  background-color: var(--color-bg-alt);
}

.section--navy {
  background-color: var(--color-primary-900);
  color: #fff;
}

.section--navy h2,
.section--navy h3,
.section--navy h4 {
  color: #fff;
}

.section--navy p {
  color: var(--color-primary-200);
}

/* Section Header */
.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto var(--space-12);
}

.section-header h2 {
  margin-bottom: var(--space-4);
}

.section-header p {
  margin: 0 auto;
  font-size: var(--font-size-md);
}

/* Page Header (compact, navy) */
.page-header {
  background: linear-gradient(135deg, var(--color-primary-900) 0%, var(--color-primary-800) 100%);
  padding: var(--space-20) 0 var(--space-12);
  margin-top: var(--header-height);
}

.page-header h1 {
  color: #fff;
  margin-bottom: var(--space-4);
}

.page-header p {
  color: var(--color-primary-200);
  font-size: var(--font-size-md);
  max-width: 560px;
}

/* Grid */
.grid {
  display: grid;
  gap: var(--space-8);
}

.grid--2 {
  grid-template-columns: 1fr;
}

.grid--3 {
  grid-template-columns: 1fr;
}

.grid--4 {
  grid-template-columns: 1fr;
}

/* Two-column split */
.split {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

.split--reverse {
  flex-direction: column;
}

/* Utility: visually hidden */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Reveal animation base */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}