:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #5a5f66;
  --rule: #e2e5ea;
  --link: #1a5fb4;
  --card: #f6f7f9;
  --warn-bg: #fff4d6;
  --warn-fg: #6b4a00;
  --warn-border: #e0a800;
  --ph-bg: #ffe3e3;
  --ph-fg: #8a1c1c;
  --ph-border: #d94a4a;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16181c;
    --fg: #e8eaed;
    --muted: #a3aab4;
    --rule: #2c3038;
    --link: #7cb0f0;
    --card: #1e2127;
    --warn-bg: #3a2f0a;
    --warn-fg: #ffdf8a;
    --warn-border: #b98b00;
    --ph-bg: #3d1a1a;
    --ph-fg: #ffb3b3;
    --ph-border: #b34a4a;
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  padding: 1.5rem 1.1rem 4rem;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  font-size: 17px;
  line-height: 1.65;
}

main, header, footer { max-width: 42rem; margin-left: auto; margin-right: auto; }

h1 { font-size: 1.7rem; line-height: 1.25; margin: 0 0 .3rem; letter-spacing: -0.01em; }
h2 { font-size: 1.2rem; margin: 2.2rem 0 .6rem; line-height: 1.3; }
h3 { font-size: 1.02rem; margin: 1.5rem 0 .4rem; }

p, li { overflow-wrap: break-word; }
ul, ol { padding-left: 1.3rem; }
li { margin: .35rem 0; }

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

.sub { color: var(--muted); margin: 0 0 1.2rem; font-size: .95rem; }

hr { border: 0; border-top: 1px solid var(--rule); margin: 2rem 0; }

.banner {
  background: var(--warn-bg);
  color: var(--warn-fg);
  border: 1px solid var(--warn-border);
  border-left-width: 5px;
  border-radius: 8px;
  padding: .85rem 1rem;
  margin: 0 0 1.6rem;
  font-size: .95rem;
}
.banner strong { display: block; margin-bottom: .2rem; }

.ph {
  display: inline-block;
  background: var(--ph-bg);
  color: var(--ph-fg);
  border: 1px dashed var(--ph-border);
  border-radius: 5px;
  padding: 0 .35em;
  font-weight: 700;
  font-size: .92em;
}

.nav { font-size: .95rem; margin-bottom: 1.4rem; color: var(--muted); }
.nav a { margin-right: .9rem; }

.card {
  display: block;
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 10px;
  padding: 1rem 1.1rem;
  margin: 0 0 .9rem;
  text-decoration: none;
  color: inherit;
}
.card:hover { border-color: var(--link); }
.card b { display: block; font-size: 1.05rem; color: var(--link); }
.card span { color: var(--muted); font-size: .92rem; }

footer { margin-top: 3rem; padding-top: 1.2rem; border-top: 1px solid var(--rule); color: var(--muted); font-size: .9rem; }

table { border-collapse: collapse; width: 100%; font-size: .95rem; display: block; overflow-x: auto; }
th, td { text-align: left; padding: .5rem .6rem; border-bottom: 1px solid var(--rule); vertical-align: top; }