/* ============================================================
   Deep Sea Fauna — Layout
   Shell, container, grid, section spacing, utility classes
   ============================================================ */

/* ── Layout shell ── */
.layout-shell {
  max-width: var(--layout-max);
  width: 100%;
  margin-inline: auto;
  background: var(--color-bg);
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

.layout-shell > main {
  flex: 1;
}

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

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

.container--wide {
  max-width: 1400px;
}

/* ── Section ── */
.section {
  padding-block: var(--space-3xl);
}

.section--sm {
  padding-block: var(--space-2xl);
}

.section--lg {
  padding-block: var(--space-4xl);
}

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

.section--dark {
  background: var(--color-bg-dark);
  color: var(--color-text-on-dark);
}

.section--dark h1,
.section--dark h2,
.section--dark h3,
.section--dark h4 {
  color: var(--color-text-on-dark);
}

.section--dark p {
  color: rgba(247, 245, 240, 0.93);
}

/* ── Section header ── */
.section-header {
  margin-block-end: var(--space-2xl);
}

.section-header--centered {
  text-align: center;
  max-width: 640px;
  margin-inline: auto;
  margin-block-end: var(--space-2xl);
}

.section-label {
  display: inline-block;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-block-end: var(--space-sm);
}

.section--dark .section-label {
  color: var(--color-accent-light);
}

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

.grid--2  { grid-template-columns: repeat(2, 1fr); }
.grid--3  { grid-template-columns: repeat(3, 1fr); }
.grid--4  { grid-template-columns: repeat(4, 1fr); }
.grid--auto { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }

.grid--gap-sm { gap: var(--space-md); }
.grid--gap-lg { gap: var(--space-2xl); }

@media (max-width: 1024px) {
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
}

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

/* ── Split (2-col with image) ── */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
  align-items: center;
}

.split--60-40 {
  grid-template-columns: 3fr 2fr;
}

.split--40-60 {
  grid-template-columns: 2fr 3fr;
}

@media (max-width: 768px) {
  .split,
  .split--60-40,
  .split--40-60 {
    grid-template-columns: 1fr;
  }

  .split--reverse > *:first-child {
    order: 2;
  }

  .split--reverse > *:last-child {
    order: 1;
  }
}

/* ── Flex utilities ── */
.flex            { display: flex; }
.flex--col       { flex-direction: column; }
.flex--center    { align-items: center; justify-content: center; }
.flex--between   { align-items: center; justify-content: space-between; }
.flex--wrap      { flex-wrap: wrap; }
.flex--gap-xs    { gap: var(--space-xs); }
.flex--gap-sm    { gap: var(--space-sm); }
.flex--gap-md    { gap: var(--space-md); }
.flex--gap-lg    { gap: var(--space-lg); }
.flex--gap-xl    { gap: var(--space-xl); }

/* ── Text utilities ── */
.text-center { text-align: center; }
.text-left   { text-align: left; }
.text-muted  { color: var(--color-text-light); }
.text-sm     { font-size: var(--text-sm); }
.text-lg     { font-size: var(--text-lg); }

/* ── Stack (vertical rhythm) ── */
.stack > * + * { margin-block-start: var(--space-md); }
.stack--sm > * + * { margin-block-start: var(--space-sm); }
.stack--lg > * + * { margin-block-start: var(--space-lg); }

/* ── Inline cluster ── */
.cluster {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  align-items: center;
}

/* ── Responsive show/hide ── */
@media (max-width: 768px) {
  .hide-mobile { display: none !important; }
}

@media (min-width: 769px) {
  .hide-desktop { display: none !important; }
}