.flutterby-nonprofit .site-header { box-shadow: 0 8px 30px rgba(16,47,37,.04); }
.stb-hero {
  padding: clamp(4rem, 8vw, 7rem) 0;
  background:
    radial-gradient(circle at 74% 44%, rgba(255,255,255,.78) 0 9rem, transparent 9.2rem),
    linear-gradient(135deg, rgba(32,166,107,.16), rgba(0,245,255,.14));
}
.stb-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 520px);
  gap: clamp(2rem, 8vw, 6rem);
  align-items: center;
}
.stb-hero h1 {
  margin: 0 0 1rem;
  max-width: 10ch;
  font-size: clamp(3rem, 7vw, 6.8rem);
  line-height: .92;
  font-weight: 950;
}
.stb-hero h1::first-line { color: #183d31; }
.stb-hero p {
  max-width: 58ch;
  color: rgba(16,47,37,.66);
}
.stb-visual {
  position: relative;
  padding: 3rem 0;
}
.stb-visual img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-radius: var(--radius-lg);
  box-shadow: 0 22px 64px rgba(16,47,37,.18);
  transition: transform .5s var(--ease), box-shadow .5s var(--ease);
}
.stb-visual:hover img {
  transform: translateY(-4px) scale(1.015);
  box-shadow: 0 28px 74px rgba(16,47,37,.22);
}
.stb-stat {
  position: absolute;
  right: 0;
  bottom: 1.6rem;
  width: min(260px, 72%);
  padding: 1rem;
  border-radius: 12px;
  background: rgba(255,255,255,.9);
  box-shadow: 0 16px 48px rgba(16,47,37,.12);
}
.stb-stat strong {
  display: block;
  font-size: 1.8rem;
}
.stb-stat span {
  color: rgba(16,47,37,.66);
  font-size: .9rem;
}

.stb-card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}
.stb-card {
  min-height: 230px;
  padding: 1.25rem;
  border: 1px solid rgba(16,47,37,.09);
  border-radius: var(--radius-lg);
  background: rgba(255,255,255,.78);
  box-shadow: 0 14px 50px rgba(16,47,37,.06);
  transition: transform .26s var(--ease), box-shadow .26s var(--ease), border-color .26s var(--ease);
}
.stb-card:hover {
  transform: translateY(-4px);
  border-color: rgba(32,166,107,.18);
  box-shadow: 0 18px 55px rgba(16,47,37,.1);
}
.stb-card span {
  color: var(--green);
  font-size: .78rem;
  font-weight: 950;
  letter-spacing: .12em;
  text-transform: uppercase;
}
.stb-card h3 {
  margin: .9rem 0 .5rem;
  font-size: 1.35rem;
}
.stb-card p { color: rgba(16,47,37,.66); }

.stb-split {
  display: grid;
  grid-template-columns: .8fr 1.2fr;
  gap: 2rem;
  align-items: center;
  padding: clamp(1.4rem, 4vw, 2.4rem);
  border: 1px solid rgba(16,47,37,.08);
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(32,166,107,.08), rgba(245,189,61,.08));
}
.stb-split h2 {
  margin: 0;
  font-size: clamp(2.1rem, 4.5vw, 4.5rem);
  line-height: .98;
  font-weight: 500;
  letter-spacing: 0;
}
.stb-list {
  display: grid;
  gap: .8rem;
}
.stb-list p {
  margin: 0;
  padding: 1rem;
  border: 1px solid rgba(16,47,37,.08);
  border-radius: 10px;
  background: rgba(255,255,255,.76);
  color: rgba(16,47,37,.66);
}
.stb-list strong { color: var(--ink); }

.stb-help .section-head {
  align-items: start;
}
.small-note {
  margin-top: 1rem;
  color: rgba(16,47,37,.56);
  font-size: .92rem;
}
.small-note a { font-weight: 900; color: #0f817a; }

@media (max-width: 980px) {
  .stb-hero-grid,
  .stb-card-grid,
  .stb-split { grid-template-columns: 1fr; }
  .stb-card { min-height: auto; }
}

@media (max-width: 640px) {
  .stb-hero { padding: 2.7rem 0 3.4rem; }
  .stb-hero h1 { font-size: clamp(2.8rem, 14vw, 4rem); }
  .stb-visual { padding: 1rem 0 2.5rem; }
  .stb-stat {
    position: static;
    width: 100%;
    margin-top: .75rem;
  }
  .stb-split h2 { font-size: clamp(2rem, 10vw, 3rem); }
}