/* Layout utilities — containers, bands, grids, breakpoints (900 / 640). */
:root {
  --content-max-width: 1240px;
  --content-gutter: 40px;

  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;
}

@media (max-width: 640px) {
  :root {
    --content-gutter: 20px;
  }
}

/* Containers ------------------------------------------------------------ */
.container {
  width: 100%;
  max-width: var(--content-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: calc(var(--content-gutter) + var(--safe-area-left));
  padding-right: calc(var(--content-gutter) + var(--safe-area-right));
}

.container--narrow { max-width: calc(820px + var(--content-gutter) * 2); }   /* mission statement */
.container--prose  { max-width: calc(750px + var(--content-gutter) * 2); }   /* intro prose */
.container--story  { max-width: calc(720px + var(--content-gutter) * 2); }   /* story body */
.container--faq    { max-width: calc(840px + var(--content-gutter) * 2); }   /* FAQ, pull quote */
.container--form   { max-width: calc(640px + var(--content-gutter) * 2); }   /* donate card */
.container--strip  { max-width: calc(860px + var(--content-gutter) * 2); }   /* donate image row */

/* Sections / vertical rhythm ------------------------------------------- */
.section        { padding: 80px 0; }
.section--hero  { padding: 96px 0 20px; }   /* interior page hero (About) */
.section--lg    { padding: 90px 0; }
.section--md    { padding: 88px 0; }
.section--band  { padding: 56px 0; }        /* dark + blue CTA bands */
.section--flush-top { padding-top: 0; }
.section--flush-bottom { padding-bottom: 0; }

/* Surface bands ---------------------------------------------------------- */
.band--tint  { background-color: var(--bg-tint); }
.band--dark  { background-color: var(--bg-dark); }
.band--brand { background-color: var(--bg-brand); }

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

.on-dark h1, .on-dark h2, .on-dark h3, .on-dark h4,
.on-dark .h-band, .on-dark .h-section {
  color: #fff;
}

.on-dark .eyebrow {
  color: var(--brand-light);
}

.on-blue {
  background-color: var(--bg-brand);
  color: var(--on-blue);
}

.on-blue h1, .on-blue h2, .on-blue h3, .on-blue h4,
.on-blue .h-band, .on-blue .h-section {
  color: #fff;
}

.on-blue .eyebrow {
  color: #fff;
}

/* Grids ------------------------------------------------------------------ */
.grid-2 {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 64px;
  align-items: start;
}

.grid-2--wide {            /* 1fr 1.4fr — heading left, copy right */
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr);
}

.grid-2--wide-left {       /* 1.3fr 1fr — form left, details right */
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
}

.grid-2--form {            /* 1fr 1.2fr — intro left, form right */
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
}

.grid-2--tight {
  gap: 24px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}

.grid-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
}

.grid-cards--280 { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
.grid-cards--300 { grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 28px; }

/* Grid items must be allowed to shrink below their content's intrinsic width
   (images report their natural pixel size as min-content in Safari, which
   otherwise blows the tracks out past the viewport). */
.grid-2 > *,
.grid-3 > *,
.grid-4 > *,
.grid-cards > * {
  min-width: 0;
}

/* Flex helpers ----------------------------------------------------------- */
.stack       { display: flex; flex-direction: column; }
.stack-sm > * + * { margin-top: var(--space-3); }
.stack-md > * + * { margin-top: var(--space-5); }
.stack-lg > * + * { margin-top: var(--space-7); }

.row-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 28px;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* Media ------------------------------------------------------------------ */
.img-cover {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.ratio-4x3, .ratio-3x2, .ratio-1x1, .ratio-16x9 {
  display: block;
  width: 100%;
  min-width: 0;
  overflow: hidden;
}

.ratio-4x3 { aspect-ratio: 4 / 3; }
.ratio-3x2 { aspect-ratio: 3 / 2; }
.ratio-1x1 { aspect-ratio: 1 / 1; }
.ratio-16x9 { aspect-ratio: 16 / 9; }

.ratio-4x3 img, .ratio-3x2 img, .ratio-1x1 img, .ratio-16x9 img,
.ratio-16x9 iframe, .ratio-16x9 video {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
  object-fit: cover;
}

/* Text helpers ----------------------------------------------------------- */
.text-center { text-align: center; }
.uppercase { text-transform: uppercase; letter-spacing: 0.2em; }
.measure-sm { max-width: 480px; }
.measure    { max-width: 560px; }
.measure-lg { max-width: 750px; }

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Breakpoints ------------------------------------------------------------ */
@media (max-width: 900px) {
  .grid-2 {
    gap: 36px;
  }
}

@media (max-width: 640px) {
  .grid-2,
  .grid-2--wide,
  .grid-2--wide-left,
  .grid-2--form {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
  }

  .grid-2--tight {
    gap: 16px;
  }

  .grid-3 {
    grid-template-columns: minmax(0, 1fr);
  }

  .grid-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .grid-cards,
  .grid-cards--280,
  .grid-cards--300 {
    grid-template-columns: minmax(0, 1fr);
  }

  .section       { padding: 64px 0; }
  .section--lg   { padding: 64px 0; }
  .section--md   { padding: 64px 0; }
  .section--hero { padding: 64px 0 16px; }
  .section--band { padding: 48px 0; }
}