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

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

body {
  font: 16px/1.7 -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
  color: #1d1d1f;
  background: #ffffff;
  padding: 32px 20px 80px;
}

.container { max-width: 720px; margin: 0 auto; }

h1 { font-size: 30px; font-weight: 700; line-height: 1.3; margin-bottom: 6px; letter-spacing: -0.02em; }
h2 { font-size: 20px; font-weight: 600; margin: 36px 0 12px; }
h3 { font-size: 16px; font-weight: 600; margin: 20px 0 8px; }

p, li { margin-bottom: 12px; }
ul, ol { padding-left: 24px; margin-bottom: 12px; }
li { margin-bottom: 6px; }
strong { font-weight: 600; }
em { font-style: normal; color: #6e6e73; }

a { color: #0071e3; text-decoration: none; }
a:hover { text-decoration: underline; }

.meta { color: #6e6e73; font-size: 14px; margin-bottom: 24px; }
.lang-switch { font-size: 14px; margin-bottom: 24px; }

.cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 32px;
}
.card {
  display: block;
  padding: 20px;
  border: 1px solid #d2d2d7;
  border-radius: 12px;
  color: inherit;
  transition: background 0.15s;
}
.card:hover { background: #f5f5f7; text-decoration: none; }
.card .t { font-size: 17px; font-weight: 600; margin-bottom: 4px; }
.card .s { font-size: 14px; color: #6e6e73; }

@media (prefers-color-scheme: dark) {
  body { background: #000; color: #f5f5f7; }
  em, .meta, .card .s { color: #98989d; }
  a { color: #2997ff; }
  .card { border-color: #424245; }
  .card:hover { background: #1c1c1e; }
}

@media (min-width: 600px) {
  body { padding: 60px 24px 100px; }
  .cards { grid-template-columns: 1fr 1fr; }
}