:root {
  --ink: #1d2420;
  --ink-soft: #4c5751;
  --ink-faint: #7d8a83;
  --green: #2f9e4f;
  --green-soft: #eaf6ee;
  --bg: #f5f7f5;
  --card: #ffffff;
  --line: #e4e9e5;
  --radius: 18px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.75 -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Helvetica Neue", "Segoe UI", sans-serif;
}

main {
  max-width: 41rem;
  margin: 0 auto;
  padding: 56px 22px 72px;
}

.page-header {
  text-align: center;
  margin-bottom: 36px;
}

.mark {
  display: inline-block;
  margin-bottom: 14px;
}

.mark svg {
  display: block;
  border-radius: 13px;
  box-shadow: 0 6px 18px rgba(47, 158, 79, 0.22);
}

h1 {
  font-size: 27px;
  line-height: 1.35;
  margin: 0 0 8px;
  letter-spacing: 0.01em;
}

.updated {
  margin: 0;
  font-size: 13.5px;
  color: var(--ink-faint);
}

.lang {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.lang a {
  display: inline-block;
  padding: 5px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 13.5px;
  color: var(--ink-soft);
  text-decoration: none;
  background: var(--card);
}

.lang a:hover {
  border-color: rgba(47, 158, 79, 0.5);
  color: var(--green);
}

.lang a[aria-current="page"] {
  background: var(--green-soft);
  border-color: #cfe8d7;
  color: var(--green);
  font-weight: 600;
}

section {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px 26px;
  margin-bottom: 18px;
}

.promise {
  background: var(--green-soft);
  border-color: #cfe8d7;
}

h2 {
  font-size: 18px;
  margin: 0 0 12px;
  letter-spacing: 0.01em;
}

.promise h2 {
  color: var(--green);
  font-size: 20px;
}

p {
  margin: 0 0 12px;
  color: var(--ink-soft);
}

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

.checklist {
  list-style: none;
  margin: 0;
  padding: 0;
}

.checklist li {
  position: relative;
  padding-left: 28px;
  margin-bottom: 8px;
  color: var(--ink-soft);
}

.checklist li:last-child { margin-bottom: 0; }

.checklist li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 0.52em;
  width: 13px;
  height: 8px;
  border-left: 2.5px solid var(--green);
  border-bottom: 2.5px solid var(--green);
  border-radius: 1px;
  transform: rotate(-45deg);
}

dl { margin: 0; }

dt {
  font-weight: 600;
  color: var(--ink);
  margin-top: 14px;
}

dt:first-child { margin-top: 0; }

dd {
  margin: 4px 0 0;
  color: var(--ink-soft);
}

a {
  color: var(--green);
  text-decoration-color: rgba(47, 158, 79, 0.4);
  text-underline-offset: 3px;
}

a:focus-visible {
  outline: 3px solid rgba(47, 158, 79, 0.5);
  outline-offset: 2px;
  border-radius: 3px;
}

footer {
  text-align: center;
  margin-top: 34px;
  font-size: 13.5px;
  color: var(--ink-faint);
}

footer p { color: var(--ink-faint); font-size: 13.5px; }

@media (max-width: 480px) {
  main { padding: 36px 16px 56px; }
  section { padding: 20px 18px; }
  h1 { font-size: 23px; }
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #eef2ef;
    --ink-soft: #b7c1bb;
    --ink-faint: #8b968f;
    --green: #5cc47c;
    --green-soft: #1b2b21;
    --bg: #121614;
    --card: #1a211d;
    --line: #2a332d;
  }
  .promise { border-color: #2d4634; }
}

@media print {
  body { background: #fff; }
  section { border: 1px solid #ddd; box-shadow: none; }
}