:root {
  --ink: #1d2b45;
  --muted: #5b7aa6;
  --bg: #eaf4fc;
  --card: #ffffff;
  --accent: #ff6b35;
  --sky: #8fd0ff;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

main {
  max-width: 720px;
  margin: 32px auto;
  padding: 32px 24px;
  background: var(--card);
  border: 4px solid var(--ink);
  border-radius: 24px;
}

@media (max-width: 760px) {
  main { margin: 16px; padding: 24px 18px; }
}

h1 { font-size: 2em; line-height: 1.2; margin: 0 0 4px; }
h2 { font-size: 1.25em; margin: 1.8em 0 0.4em; }
h3 { font-size: 1.05em; margin: 1.3em 0 0.2em; }
.meta { color: var(--muted); margin-top: 0; }
a { color: #1b6fb8; }
.back { margin: 0 0 12px; }
.back a { text-decoration: none; }

.summary {
  background: #fff3c4;
  border: 3px solid #ffd23f;
  border-radius: 16px;
  padding: 14px 18px;
  margin: 20px 0;
}

.icon { border-radius: 26px; display: block; margin-bottom: 16px; }
.links { margin-top: 2em; }
li { margin: 4px 0; }