*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --blue:   #1A73E8;
  --blue-d: #1557B0;
  --grey:   #37474F;
  --grey-d: #263238;
  --green:  #2E7D32;
  --bg:     #F5F7FA;
  --white:  #FFFFFF;
  --text:   #1A1A1A;
  --muted:  #607D8B;
}

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

header {
  background: linear-gradient(135deg, var(--grey-d), var(--grey));
  color: var(--white);
  padding: 40px 5% 32px;
}

header .brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}

header .brand img {
  width: 34px;
  height: 34px;
  border-radius: 8px;
}

header .brand span {
  font-weight: 800;
  font-size: 16px;
}

header h1 {
  font-size: clamp(24px, 4vw, 32px);
  font-weight: 800;
}

header p.updated {
  margin-top: 8px;
  color: rgba(255,255,255,0.75);
  font-size: 13px;
}

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 40px 5% 80px;
}

.card {
  background: var(--white);
  border-radius: 16px;
  padding: clamp(24px, 5vw, 48px);
  box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}

.card > p:first-child {
  color: var(--muted);
  font-size: 14.5px;
  margin-bottom: 8px;
}

h2 {
  font-size: 17px;
  font-weight: 700;
  color: var(--grey-d);
  margin-top: 30px;
  margin-bottom: 10px;
}

h2:first-of-type { margin-top: 24px; }

p, li {
  font-size: 14.5px;
  color: #37474F;
}

p { margin-bottom: 10px; }

ul { margin: 8px 0 12px 22px; }
li { margin-bottom: 6px; }

strong { color: var(--text); }

a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }

footer {
  text-align: center;
  padding: 24px 5% 48px;
  font-size: 12.5px;
  color: var(--muted);
}

.back-link {
  display: inline-block;
  margin-top: 4px;
  font-weight: 600;
}

@media (prefers-color-scheme: dark) {
  body { background: #14181B; color: #E8EAED; }
  .card { background: #1E2328; box-shadow: none; }
  .card > p:first-child { color: #8A97A0; }
  h2 { color: #E8EAED; }
  p, li { color: #C4CDD3; }
  strong { color: #FFFFFF; }
  footer { color: #8A97A0; }
}