/* =========================================================================
   Layout primitives — container, section rhythm, grids, helpers
   ========================================================================= */

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: clamp(1.1rem, 0.5rem + 3vw, 2.5rem);
}

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

.section {
  padding-block: var(--section-y);
}

.section--tight {
  padding-block: clamp(2.5rem, 1.5rem + 4vw, 4.5rem);
}

/* Dark "spotlight" band — echoes YouTube dark mode for dramatic contrast */
.section--dark {
  background: var(--surface-dark);
  color: var(--text-on-dark);
  position: relative;
}

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

.section--dark p {
  color: var(--text-on-dark-2);
}

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

/* Section heading block */
.section-head {
  max-width: 720px;
  margin-inline: auto;
  text-align: center;
  margin-bottom: clamp(2.5rem, 1.5rem + 3vw, 4rem);
}

.section-head--left {
  text-align: left;
  margin-inline: 0;
}

.section-head .lead {
  margin-top: var(--space-4);
  font-size: var(--fs-lead);
  color: var(--text-secondary);
}

.section--dark .section-head .lead {
  color: var(--text-on-dark-2);
}

/* Eyebrow label */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--fs-eyebrow);
  font-weight: var(--fw-bold);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--yt-red);
  margin-bottom: var(--space-4);
}

.eyebrow::before {
  content: "";
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: var(--yt-red);
}

.section-head--center .eyebrow {
  justify-content: center;
}

/* Generic responsive grids */
.grid {
  display: grid;
  gap: clamp(1.1rem, 0.6rem + 1.6vw, 2rem);
}

.grid-2 {
  grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

@media (max-width: 960px) {
  .grid-3,
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 620px) {
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
}