* {
  box-sizing: border-box;
}

:root {
  color-scheme: light;
  --bg: #f5f5f5;
  --surface: #ffffff;
  --text: #212121;
  --muted: #757575;
  --primary: #1976d2;
  --border: #e0e0e0;
}

html {
  min-height: 100%;
  background: var(--bg);
}

body {
  margin: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 15px;
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
  -webkit-text-size-adjust: 100%;
}

.page {
  max-width: 760px;
  margin: 0 auto;
  padding: calc(18px + env(safe-area-inset-top)) 18px
    calc(28px + env(safe-area-inset-bottom));
}

.document-header {
  padding: 4px 2px 18px;
}

h1 {
  margin: 0 0 6px;
  color: var(--text);
  font-size: 24px;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: 0;
}

.updated-at {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.section {
  margin: 0 0 12px;
  padding: 17px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
}

h2 {
  margin: 0 0 8px;
  color: var(--text);
  font-size: 17px;
  font-weight: 650;
  line-height: 1.38;
  letter-spacing: 0;
}

p {
  margin: 0;
  color: var(--muted);
}

a {
  color: var(--primary);
  text-decoration: none;
}

@media (min-width: 720px) {
  .page {
    padding-left: 24px;
    padding-right: 24px;
  }
}