.l-shell {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}


.l-header {
  position: sticky;
  top: 0;
  z-index: 900;
  display: flex;
  align-items: center;
  gap: var(--gap-md);
  padding: 0.7rem clamp(1rem, 3vw, 2rem);
  background: var(--surface-page);
  border-bottom: 1px solid var(--line);
}


.l-body {
  display: flex;
  flex-direction: column;
  width: 100%;
}

.l-main {
  order: 1;
  min-width: 0;
}

.l-rail {
  order: 2;
  padding: 0 var(--gap-md) var(--band);
}

.l-content {
  display: block;
}

.l-container {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
}

.l-section {
  padding: var(--band) var(--gap-md);
}

.l-section-alt {
  background: var(--surface-sunken);
}

.l-section-tint {
  background: var(--surface-tint);
}


.l-grid-auto {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(18.75rem, 1fr));
  gap: 2rem;
}

.l-split {
  display: grid;
  gap: var(--gap-lg);
}


.l-hero {
  position: relative;
  isolation: isolate;
  padding: clamp(3.5rem, 9vw, 9rem) 1rem;
  overflow: hidden;
  background: var(--surface-page);
}


.l-footer {
  margin-top: auto;
  background: var(--surface-raised);
  border-top: 1px solid var(--line);
}

.l-order-band {
  padding: var(--band) var(--gap-md);
  background: var(--surface-deep);
  color: var(--ink-invert);
}

@media (min-width: 640px) {
  .l-split {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--gap-xl);
    align-items: center;
  }
}

@media (min-width: 1080px) {
  .l-body {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 19rem;
    align-items: start;
    gap: 0;
  }

  .l-rail {
    position: sticky;
    top: 5.5rem;
    padding: var(--band) clamp(1rem, 2vw, 1.5rem) var(--band) 0;
  }

  .l-section {
    padding-left: clamp(1rem, 3vw, 2.5rem);
    padding-right: clamp(1rem, 3vw, 2.5rem);
  }
}