/* Scoped proof of concept: no JavaScript or framework required. */
.river-schematic{margin-block:2rem;padding:clamp(.3rem,2vw,2rem);background:#101820;border:1px solid #59746f;border-radius:var(--ps-radius);color:#b5ecdb;overflow:hidden}
.river-schematic svg{display:block;width:100%;height:auto}
.river-intro>p{max-width:75ch}
.river-chapters{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1.25rem;margin-top:2rem}
.river-chapters article{padding:clamp(1.2rem,3vw,2.5rem);background:#fff;border:1px solid #98b2ab;border-radius:var(--ps-radius);color:#152b2b}
.river-chapters h3{font-size:clamp(1.4rem,2.3vw,2.1rem)}
.river-chapters a{color:#205c50;font-weight:700}
@media(max-width:760px){.river-chapters{grid-template-columns:1fr}.river-schematic{padding:0}.river-schematic svg{min-height:170px}}