/* =============================================================
   Science Habitat — Layout System
   ============================================================= */

/* ─── Container ─── */
.sh-container {
  max-width: var(--sh-container-max);
  margin: 0 auto;
  padding: 0 var(--sh-container-pad);
}

.sh-container--narrow { max-width: 800px; margin: 0 auto; padding: 0 var(--sh-container-pad); }
.sh-container--wide   { max-width: 1400px; margin: 0 auto; padding: 0 var(--sh-container-pad); }

/* ─── Sections ─── */
.sh-section         { padding: 80px 0; }
.sh-section--sm     { padding: 48px 0; }
.sh-section--lg     { padding: 100px 0; }
.sh-section--alt    { background: var(--sh-light); }
.sh-section--navy   { background: var(--sh-navy); }
.sh-section--teal   { background: var(--sh-teal); }

/* ─── Grid System ─── */
.sh-grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px; }
.sh-grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.sh-grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.sh-grid-5 { display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px; }

/* Two-column with sidebar */
.sh-layout-content-sidebar {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 48px;
}

.sh-layout-sidebar-content {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 48px;
}

.sh-layout-equal {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

/* ─── Page Wrapper ─── */
.layout-container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main { flex: 1; padding-top: var(--sh-nav-height); }

/* ─── Page with Sidebar Layout ─── */
.page-has-sidebar .layout-content {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 40px;
  max-width: var(--sh-container-max);
  margin: 0 auto;
  padding: 0 var(--sh-container-pad);
}

/* ─── Breadcrumbs ─── */
.sh-breadcrumb {
  font-size: var(--sh-text-sm);
  color: var(--sh-muted);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.sh-breadcrumb a { color: rgba(255,255,255,0.5); }
.sh-breadcrumb a:hover { color: var(--sh-teal-light); }
.sh-breadcrumb .sep { color: rgba(255,255,255,0.3); }
.sh-breadcrumb .current { color: var(--sh-teal-light); }

/* ─── Section Header ─── */
.sh-section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto var(--sh-space-56);
}
.sh-section-header--left {
  text-align: left;
  max-width: none;
  margin: 0 0 var(--sh-space-32);
}
.sh-section-header h2 { margin-bottom: 16px; }
.sh-section-header p  { color: var(--sh-muted); }

.sh-eyebrow {
  display: block;
  font-family: var(--sh-font-mono);
  font-size: var(--sh-text-xs);
  color: var(--sh-teal);
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

/* ─── Responsive ─── */
@media (max-width: 1023px) {
  .sh-layout-content-sidebar,
  .sh-layout-sidebar-content,
  .sh-layout-equal {
    grid-template-columns: 1fr;
  }
  .page-has-sidebar .layout-content {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .sh-section    { padding: 56px 0; }
  .sh-section--sm { padding: 32px 0; }
  .sh-grid-2,
  .sh-grid-3,
  .sh-grid-4,
  .sh-grid-5 { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  :root { --sh-container-pad: 16px; }
}