:root {
  --ink: #17262c;
  --muted: #607078;
  --line: #d9e2df;
  --surface: #ffffff;
  --soft: #eef8f5;
  --accent: #008c7a;
  --accent-strong: #006d60;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  color: var(--ink);
  background: #f4f7f6;
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.6;
}
header {
  background: #10252b;
  color: #fff;
  border-top: 5px solid var(--accent);
}
.header-inner, main, footer {
  width: min(920px, calc(100% - 32px));
  margin: 0 auto;
}
.header-inner { padding: 32px 0 28px; }
.eyebrow {
  margin: 0 0 4px;
  color: #8ee1d4;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .05em;
  text-transform: uppercase;
}
h1 { margin: 0; font-size: clamp(28px, 5vw, 42px); line-height: 1.15; }
.version { margin: 10px 0 0; color: #d7e5e2; font-size: 14px; }
main {
  margin-top: 24px;
  margin-bottom: 24px;
  padding: clamp(22px, 5vw, 48px);
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--surface);
  box-shadow: 0 14px 34px rgba(23, 38, 44, .08);
}
h2 { margin: 34px 0 10px; color: #124b43; font-size: 22px; line-height: 1.25; }
h2:first-of-type { margin-top: 0; }
p { margin: 0 0 14px; }
ul { margin: 8px 0 18px; padding-left: 24px; }
li + li { margin-top: 5px; }
a { color: var(--accent-strong); font-weight: 700; }
.contact {
  margin-top: 30px;
  padding: 18px;
  border-left: 4px solid var(--accent);
  border-radius: 10px;
  background: var(--soft);
}
.back {
  display: inline-block;
  margin-top: 10px;
  padding: 10px 14px;
  border: 1px solid #a9cbc4;
  border-radius: 9px;
  text-decoration: none;
}
footer { padding: 4px 0 28px; color: var(--muted); font-size: 13px; text-align: center; }
@media (max-width: 520px) {
  .header-inner, main, footer { width: min(100% - 20px, 920px); }
  .header-inner { padding: 24px 4px 22px; }
  main { margin-top: 10px; padding: 20px 18px; border-radius: 12px; }
  h2 { font-size: 20px; }
}