* { box-sizing: border-box; }

html { font-family: Arial, Helvetica, sans-serif; color: #20252a; background: #f5f6f4; }

body { margin: 0; }

main {
  width: min(880px, calc(100% - 40px));
  margin: 70px auto 40px;
  background: white;
  padding: 52px 60px;
  border: 1px solid #dfe3df;
}

header {
  display: flex;
  align-items: center;
  gap: 22px;
  padding-bottom: 30px;
  border-bottom: 3px solid #263c35;
}

.mark {
  width: 68px;
  height: 68px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: #263c35;
  color: white;
  font-family: Georgia, serif;
  font-size: 38px;
  font-weight: bold;
}

h1 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(30px, 5vw, 46px);
  line-height: 1.05;
}

.tagline {
  margin: 9px 0 0;
  color: #657069;
  letter-spacing: .04em;
}

section { margin-top: 36px; }

h2 {
  margin: 0 0 9px;
  font-size: 18px;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: #263c35;
}

p { margin: 0; line-height: 1.65; font-size: 17px; }

a { color: #245c4d; }

footer {
  width: min(880px, calc(100% - 40px));
  margin: 0 auto 50px;
  text-align: center;
  color: #707770;
  font-size: 14px;
}

@media (max-width: 600px) {
  main { margin-top: 20px; padding: 32px 26px; }
  header { align-items: flex-start; }
  .mark { width: 52px; height: 52px; font-size: 29px; flex: 0 0 auto; }
}