:root {
  color-scheme: light;
  --ink: #1b2436;
  --muted: #56627a;
  --accent: #2f74ff;
  --bg: #eef5ff;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.6 system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
}
main {
  max-width: 760px;
  margin: 0 auto;
  padding: 24px 16px 48px;
}
article {
  background: #fff;
  border-radius: 16px;
  padding: 20px 22px;
  margin: 16px 0;
  box-shadow: 0 4px 18px rgba(22, 48, 94, 0.08);
}
h1 { margin: 0 0 4px; font-size: 28px; color: #16305e; }
h2 { margin: 24px 0 6px; font-size: 18px; color: #16305e; }
.meta { margin: 0 0 12px; color: var(--muted); font-size: 14px; }
.tldr { padding: 12px 14px; border-radius: 12px; background: #e3eefc; }
.todo { background: #fff3c4; padding: 0 4px; border-radius: 4px; }
.fine { margin: 4px 0; font-size: 12px; line-height: 1.5; color: var(--muted); }
a { color: var(--accent); }
.lang, footer { text-align: center; color: var(--muted); font-size: 14px; }
ul { padding-left: 20px; }
details { margin: 8px 0; }
summary { cursor: pointer; font-weight: 600; }