:root {
  --bg: #f7f8fa;
  --card: #ffffff;
  --ink: #14171f;
  --ink-soft: #4b5160;
  --ink-faint: #7b8194;
  --accent: #00a545;
  --border: #e4e6ea;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0a0e1a;
    --card: #131826;
    --ink: #f0f4ff;
    --ink-soft: #aab0c6;
    --ink-faint: #6b7286;
    --accent: #00c853;
    --border: #232b40;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 24px 96px;
}

.masthead {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 8px;
}

.mark {
  width: 38px;
  height: 38px;
  border-radius: 11px;
  background: linear-gradient(155deg, #00c853, #009624);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #05170a;
  font-weight: 800;
  font-size: 15px;
  flex-shrink: 0;
}

.masthead a {
  color: var(--ink);
  text-decoration: none;
  font-weight: 700;
  font-size: 18px;
}

.updated {
  color: var(--ink-faint);
  font-size: 13px;
  margin: 0 0 36px;
}

h1 {
  font-size: 28px;
  letter-spacing: -0.01em;
  margin: 24px 0 4px;
}

h2 {
  font-size: 18px;
  margin: 36px 0 10px;
  letter-spacing: -0.005em;
}

p, li { color: var(--ink-soft); font-size: 15px; }

ul { padding-left: 20px; }
li { margin-bottom: 6px; }

a { color: var(--accent); }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px 20px;
  margin: 20px 0;
}

.nav-links {
  display: flex;
  gap: 16px;
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  font-size: 13.5px;
}

.nav-links a { color: var(--ink-faint); }
.nav-links a:hover { color: var(--accent); }

footer {
  margin-top: 48px;
  color: var(--ink-faint);
  font-size: 13px;
}