:root {
  color-scheme: light;
  --green: #123f35;
  --green-soft: #e9f1ee;
  --orange: #f2a000;
  --ink: #1d2926;
  --muted: #5d6b67;
  --line: #dce5e1;
  --paper: #ffffff;
  --background: #f5f7f6;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--background);
  color: var(--ink);
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.6;
}

header {
  background: var(--green);
  color: white;
  padding: 26px 20px;
}

.brand {
  width: min(860px, 100%);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 14px;
}

.mark {
  display: grid;
  width: 48px;
  height: 48px;
  place-items: center;
  border-radius: 14px;
  background: var(--orange);
  color: var(--green);
  font-size: 25px;
  font-weight: 800;
}

.brand strong { display: block; font-size: 20px; }
.brand span { color: #d3e2dc; font-size: 14px; }

main {
  width: min(860px, calc(100% - 32px));
  margin: 32px auto;
  padding: clamp(24px, 5vw, 52px);
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--paper);
  box-shadow: 0 12px 35px rgba(18, 63, 53, 0.08);
}

h1 { margin: 0 0 8px; color: var(--green); line-height: 1.2; }
h2 { margin-top: 32px; color: var(--green); font-size: 21px; }
p, li { color: var(--muted); }
.updated { margin-top: 0; font-size: 14px; }

.notice {
  margin: 24px 0;
  padding: 18px 20px;
  border-left: 5px solid var(--orange);
  border-radius: 8px;
  background: var(--green-soft);
}

.button {
  display: inline-block;
  margin: 12px 0;
  padding: 13px 20px;
  border-radius: 10px;
  background: var(--orange);
  color: #17251f;
  font-weight: 700;
  text-decoration: none;
}

a { color: #096b57; }

footer {
  width: min(860px, calc(100% - 32px));
  margin: 0 auto 32px;
  color: var(--muted);
  font-size: 14px;
  text-align: center;
}

footer a { margin: 0 8px; }

@media (max-width: 520px) {
  header { padding: 20px 16px; }
  main { margin: 18px auto; }
  .mark { width: 42px; height: 42px; }
}