:root {
  color-scheme: light;
  --bg: #f7f4ee;
  --ink: #18201c;
  --muted: #5f675f;
  --line: #ddd5c8;
  --accent: #1f7a5a;
  --panel: #ffffff;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", sans-serif;
  line-height: 1.8;
  background: var(--bg);
  color: var(--ink);
}

main {
  width: min(760px, calc(100% - 40px));
  margin: 40px auto;
  padding: 30px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: 0 18px 45px rgba(24, 32, 28, 0.08);
}

h1, h2 {
  line-height: 1.35;
  letter-spacing: 0;
}

h1 {
  margin: 0 0 18px;
  font-size: clamp(2rem, 7vw, 2.75rem);
}

h2 {
  margin-top: 30px;
  font-size: 1.22rem;
}

p { margin: 0 0 14px; }

ul {
  margin: 0 0 14px;
  padding-left: 1.4rem;
}

a {
  color: var(--accent);
  font-weight: 700;
  text-decoration: none;
}

.date {
  margin-top: 34px;
  color: var(--muted);
  font-size: 0.92rem;
}

@media (max-width: 520px) {
  main {
    width: min(100% - 24px, 760px);
    margin: 12px auto;
    padding: 22px;
    border-radius: 12px;
  }
}