/* ==========================================================================
   G WORLD — page shell, grid and spacing utilities
   --------------------------------------------------------------------------
   Layout is CSS Grid + Flexbox with fluid `clamp()` spacing; the only media
   queries are the handful of places where a one- vs two-column decision has to
   change (header, hero, lesson player, admin split view).
   ========================================================================== */

.container {
  width: min(100% - 2 * var(--space-4), var(--container));
  margin-inline: auto;
}

.container--narrow {
  width: min(100% - 2 * var(--space-4), 48rem);
}

.container--wide {
  width: min(100% - 2 * var(--space-4), 88rem);
}

/* ------------------------------------------------------------------ shell */

.skip-target:focus {
  outline: none;
}

.site-header {
  position: sticky;
  inset-block-start: 0;
  z-index: var(--z-header);
  background-color: color-mix(in srgb, var(--surface) 92%, transparent);
  backdrop-filter: blur(10px);
  border-block-end: 1px solid var(--border);
}

.site-main {
  flex: 1 0 auto;
  padding-block: var(--space-6) var(--space-8);
}

.site-footer {
  flex: 0 0 auto;
  border-block-start: 1px solid var(--border);
  background-color: var(--surface);
  padding-block: var(--space-6) var(--space-4);
}

/* ---------------------------------------------------------------- sections */

.section {
  padding-block: var(--space-6);
}

.section + .section {
  border-block-start: 1px solid var(--border);
}

.section__head {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  align-items: end;
  justify-content: space-between;
  margin-block-end: var(--space-5);
}

.section__head h2,
.section__head h3 {
  margin-block-end: var(--space-1);
}

/* -------------------------------------------------------------------- grid */

.grid {
  display: grid;
  gap: var(--space-5);
}

.grid--cards {
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 17rem), 1fr));
}

.grid--departments {
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 14rem), 1fr));
}

.grid--two {
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 22rem), 1fr));
}

.grid--sidebar {
  grid-template-columns: minmax(0, 1fr);
}

@media (min-width: 62rem) {
  .grid--sidebar {
    grid-template-columns: minmax(0, 2.1fr) minmax(18rem, 1fr);
    align-items: start;
  }
}

/* ------------------------------------------------------------ stack helpers */

.stack > * + * {
  margin-block-start: var(--space-4);
}

.stack-sm > * + * {
  margin-block-start: var(--space-2);
}

.stack-lg > * + * {
  margin-block-start: var(--space-6);
}

.cluster {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  align-items: center;
}

.cluster--tight {
  gap: var(--space-2);
}

.cluster--between {
  justify-content: space-between;
}

.cluster--end {
  justify-content: flex-end;
}

/* --------------------------------------------------------------- page header */

.page-head {
  padding-block-end: var(--space-5);
  border-block-end: 1px solid var(--border);
  margin-block-end: var(--space-6);
}

.page-head__eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: var(--step--1);
  font-weight: 600;
  color: var(--brand-600);
  margin-block-end: var(--space-2);
}

/* ------------------------------------------------------------------- hero */

.hero {
  display: grid;
  gap: var(--space-6);
  align-items: center;
  padding-block: var(--space-7);
}

@media (min-width: 56rem) {
  .hero {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  }
}

.hero__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(7rem, 1fr));
  gap: var(--space-4);
  margin-block-start: var(--space-5);
}

/* --------------------------------------------------------- lesson layout */

.lesson-layout {
  display: grid;
  gap: var(--space-5);
  align-items: start;
}

@media (min-width: 68rem) {
  .lesson-layout {
    grid-template-columns: minmax(0, 1fr) minmax(19rem, 22rem);
  }
}

/* ----------------------------------------------------------- admin layout */

.admin-layout {
  display: grid;
  gap: var(--space-5);
}

@media (min-width: 64rem) {
  .admin-layout {
    grid-template-columns: 15rem minmax(0, 1fr);
  }
}

/* --------------------------------------------------------------- spacing --- */

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

.mb-0 {
  margin-block-end: 0;
}
.mb-2 {
  margin-block-end: var(--space-2);
}
.mb-3 {
  margin-block-end: var(--space-3);
}
.mb-4 {
  margin-block-end: var(--space-4);
}
.mb-5 {
  margin-block-end: var(--space-5);
}
.mt-4 {
  margin-block-start: var(--space-4);
}
.mt-5 {
  margin-block-start: var(--space-5);
}

.text-center {
  text-align: center;
}

.measure {
  max-width: var(--measure);
}

.full-width {
  width: 100%;
}

.mx-auto {
  margin-inline: auto;
}