:root {
  color: #173c35;
  background: #edf2ee;
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
}

* { box-sizing: border-box; }
body { min-width: 320px; margin: 0; }

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 76px;
  padding: 16px clamp(20px, 5vw, 72px);
  color: #eff8ef;
  background: #173c35;
}

.brand, .back-link {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: inherit;
  text-decoration: none;
}

.brand { font-size: 11px; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; }
.brand img { display: block; width: 83px; height: 31px; object-fit: contain; object-position: left center; }
.back-link { padding: 10px 14px; border: 1px solid rgba(219, 237, 220, .35); border-radius: 10px; font-size: 14px; font-weight: 750; }
.back-link:hover, .back-link:focus-visible { border-color: #c7e1bd; color: #fff; outline: none; background: rgba(255, 255, 255, .08); }
.back-link span { color: #c7e1bd; font-size: 16px; }

main { width: min(100%, 1500px); margin: 0 auto; padding: clamp(34px, 5vw, 68px) clamp(20px, 5vw, 72px) 72px; }
.page-intro { display: grid; gap: 10px; max-width: 780px; margin-bottom: 26px; }
.page-intro p { margin: 0; color: #5d896f; font-size: 12px; font-weight: 850; letter-spacing: .12em; text-transform: uppercase; }
.page-intro h1 { margin: 0; color: #173c35; font-size: clamp(34px, 5vw, 58px); letter-spacing: -.06em; line-height: .98; }
.page-intro span { max-width: 620px; color: #637a6d; font-size: 16px; line-height: 1.55; }

.scheme-card { margin: 0; overflow: hidden; border: 1px solid #d5e1d7; border-radius: 20px; background: #fff; box-shadow: 0 18px 45px rgba(22, 61, 46, .1); }
.scheme-card figcaption { padding: 16px 20px; border-bottom: 1px solid #dce8df; color: #476857; background: #f7faf7; font-size: 12px; font-weight: 850; letter-spacing: .08em; text-transform: uppercase; }
.scheme-scroll { overflow: auto; padding: clamp(12px, 2vw, 26px); background: #f2f6f2; scrollbar-color: #8aa99a #e7eee8; scrollbar-width: thin; }
.scheme-scroll:focus-visible { outline: 3px solid #c4e0a6; outline-offset: -3px; }
.scheme-scroll img { display: block; width: max(100%, 1120px); height: auto; margin: 0 auto; }

@media (max-width: 640px) {
  .site-header { min-height: 68px; padding: 14px 18px; }
  .brand span { display: none; }
  .back-link { padding: 9px 11px; font-size: 13px; }
  main { padding: 34px 14px 44px; }
  .page-intro { margin-bottom: 20px; }
  .page-intro span { font-size: 14px; }
  .scheme-card { border-radius: 14px; }
  .scheme-card figcaption { padding: 14px 16px; }
  .scheme-scroll { padding: 10px; }
  .scheme-scroll img { width: 1060px; }
}

@media (prefers-reduced-motion: reduce) { .back-link { transition: none; } }