:root {
  color-scheme: light;
  font-family: Tahoma, Arial, sans-serif;
  color: #16332b;
  background: #f6f8f3;
  --green: #195340;
  --muted: #495e54;
  --gold: #b58b43;
}
* { box-sizing: border-box; }
body { margin: 0; }
main { width: min(100% - 2rem, 36rem); margin: 0 auto; padding: clamp(2rem, 8vh, 5rem) 0 2rem; }
header { text-align: center; }
.mark {
  display: inline-grid; place-items: center; width: 3.5rem; height: 3.5rem;
  color: #fff; background: var(--green); border-radius: 1rem; font: bold 1.35rem monospace;
}
.course { color: var(--green); font-weight: bold; font-size: .95rem; margin: 1rem 0 .45rem; }
h1 { margin: 0; font-size: clamp(1.65rem, 6vw, 2.65rem); line-height: 1.45; }
.intro { color: var(--muted); line-height: 1.75; margin: .6rem 0 0; }
.links { display: grid; gap: .75rem; margin: 1.75rem 0; }
.step {
  display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: .85rem;
  padding: 1rem; text-decoration: none; color: inherit; background: #fff;
  border: 1px solid #ccd9ce; border-radius: .85rem;
}
.step:hover { border-color: var(--green); background: #fdfefa; }
.step:focus-visible, button:focus-visible, pre:focus-visible { outline: 3px solid var(--green); outline-offset: 4px; }
.number {
  display: inline-grid; place-items: center; width: 2.45rem; height: 2.45rem;
  background: #e8f0e9; color: var(--green); border-radius: .65rem; font-weight: bold;
}
.step strong { display: block; font-size: 1.05rem; line-height: 1.5; }
.step small { display: block; color: var(--muted); line-height: 1.5; margin-top: .2rem; }
.arrow { color: var(--green); font-size: 1.25rem; }
footer { border-top: 1px solid #d9cfb7; padding-top: 1rem; text-align: center; color: var(--muted); font-size: .86rem; }
.source { width: min(100% - 2rem, 54rem); padding-top: 2rem; }
.source header { text-align: start; }
.toolbar { display: flex; gap: .8rem; align-items: center; margin-top: 1rem; }
button { color: white; background: var(--green); border: 0; border-radius: .5rem; padding: .65rem 1rem; font: inherit; cursor: pointer; }
pre {
  background: #fff; border: 1px solid #ccd9ce; border-radius: .75rem; padding: 1rem;
  overflow: auto; font-size: .9rem; line-height: 1.65; text-align: left;
}

.prize { margin: .85rem 0 0; padding: .55rem .75rem; border: 1px solid #d9cfb7; border-radius: .6rem; background: #fff; color: var(--green); font-weight: bold; line-height: 1.6; }