:root {
  color-scheme: light dark;
  --paper: #f7f8fb;
  --panel: #ffffff;
  --ink: #172033;
  --muted: #5d687b;
  --line: #d9dfeb;
  --accent: #2f6fb3;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 17px/1.62 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
main {
  width: min(820px, calc(100% - 28px));
  margin: 0 auto;
  padding: 42px 0 64px;
}
article {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: clamp(24px, 5vw, 52px);
}
.brand {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 750;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
h1 { margin: 0 0 8px; font-size: clamp(2.15rem, 7vw, 3.7rem); line-height: 1.04; }
h2 { margin: 36px 0 10px; font-size: 1.42rem; line-height: 1.22; }
h3 { margin: 25px 0 8px; font-size: 1.08rem; }
p { margin: 0 0 15px; }
ul { margin: 0 0 17px 1.25rem; padding: 0; }
li { margin-bottom: 7px; }
a { color: var(--accent); }
.meta, footer { color: var(--muted); }
.callout {
  margin: 26px 0;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: color-mix(in srgb, var(--accent) 5%, var(--panel));
}
.links { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 32px; }
footer { margin-top: 36px; padding-top: 18px; border-top: 1px solid var(--line); font-size: 0.92rem; }

@media (prefers-color-scheme: dark) {
  :root { --paper: #0c1018; --panel: #141a24; --ink: #edf1f7; --muted: #aab4c5; --line: #303949; --accent: #82b8ef; }
}