:root {
  --bg: #f7faf8;
  --surface: #ffffff;
  --text: #17211b;
  --muted: #5f6d64;
  --line: #dce5df;
  --accent: #1f7a4d;
  --accent-soft: #e7f3eb;
  --max-width: 960px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.7;
}

main {
  width: min(calc(100% - 2rem), var(--max-width));
  margin: 0 auto;
  padding: 4rem 0;
}

header {
  padding: 3rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 1.25rem;
}

header > p:first-child {
  margin-top: 0;
  color: var(--accent);
  font-weight: 700;
  letter-spacing: 0.04em;
}

h1 {
  max-width: 820px;
  margin: 1rem 0;
  font-size: clamp(2rem, 5vw, 3.6rem);
  line-height: 1.1;
  letter-spacing: -0.035em;
}

h2 {
  margin-top: 0;
  font-size: 1.45rem;
  line-height: 1.25;
}

section {
  margin-top: 1.25rem;
  padding: 2rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 1rem;
}

section p:last-child {
  margin-bottom: 0;
}

ul {
  margin-bottom: 0;
  padding-left: 1.4rem;
}

li + li {
  margin-top: 0.55rem;
}

footer {
  padding: 2rem 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 640px) {
  main {
    padding: 1rem 0 2rem;
  }

  header,
  section {
    padding: 1.5rem;
    border-radius: 0.8rem;
  }
}