/* =====================================================
   LAYOUT.CSS — Containers, Grid, Sections, Responsive
   Insight Futures Institutional Site
   ===================================================== */

/* ── Containers ── */
.container        { width: 100%; max-width: 1280px; margin-inline: auto; padding-inline: clamp(1.25rem, 4vw, 3rem); }
.container--sm    { max-width: 860px; }
.container--lg    { max-width: 1440px; }

/* ── Section Base ── */
.section {
  padding-block: clamp(5rem, 10vw, 8rem);
  position: relative;
}
.section--alt   { background-color: var(--bg-secondary); }
.section--dark  { background-color: var(--bg-primary); }
.section--ruled { border-top: 1px solid var(--border); }

/* ── Section Header ── */
.section-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-blue);
  margin-bottom: var(--sp-4);
}
.section-tag::before {
  content: '';
  display: block;
  width: 18px; height: 2px;
  background: var(--accent-blue);
  border-radius: 1px;
}

.section-heading { margin-bottom: var(--sp-4); }

.section-lead {
  font-size: clamp(1rem, 1.8vw, 1.175rem);
  color: var(--text-muted);
  line-height: 1.75;
  max-width: 620px;
}

.section-header { margin-bottom: clamp(3rem, 6vw, 5rem); }
.section-header--c {
  text-align: center;
  margin-bottom: clamp(3rem, 6vw, 5rem);
  display: flex;
  flex-direction: column;
  align-items: center;
}
.section-header--c .section-lead { text-align: center; }

/* ── Grids ── */
.grid-2    { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--sp-6); }
.grid-3    { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--sp-6); }
.grid-4    { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--sp-6); }
.grid-auto { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: var(--sp-6); }

/* ── Flex helpers ── */
.flex         { display: flex; }
.flex-col     { display: flex; flex-direction: column; }
.flex-center  { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.flex-wrap    { flex-wrap: wrap; }
.gap-2  { gap: var(--sp-2); }
.gap-3  { gap: var(--sp-3); }
.gap-4  { gap: var(--sp-4); }
.gap-6  { gap: var(--sp-6); }
.gap-8  { gap: var(--sp-8); }

/* ── Spacing Utilities ── */
.pt-0 { padding-top: 0 !important; }
.pb-0 { padding-bottom: 0 !important; }
.pb-sm { padding-bottom: clamp(2.5rem, 5vw, 4rem) !important; }
.pt-sm { padding-top: clamp(2.5rem, 5vw, 4rem) !important; }

/* ── Responsive ── */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .grid-2,
  .grid-3,
  .grid-4  { grid-template-columns: 1fr; }
  .section-lead { max-width: 100%; }
  .hide-mobile { display: none !important; }
}

@media (max-width: 480px) {
  .container { padding-inline: 1.25rem; }
}