:root {
  color-scheme: light;
  --ink: #202630;
  --muted: #667085;
  --accent: #9b1c31;
  --paper: #fffdf8;
  --panel: #f5f1e8;
  --line: #ddd5c7;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: #e9e4da;
  color: var(--ink);
  font: 19px/1.72 Georgia, "Times New Roman", serif;
}

body > main {
  width: min(980px, calc(100% - 32px));
  margin: 32px auto;
  padding: clamp(28px, 6vw, 72px);
  background: var(--paper);
  box-shadow: 0 8px 35px #392d1c22;
}

h1, h2, h3 {
  color: #131820;
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.15;
}

h1 { margin-top: 1.5em; font-size: clamp(2rem, 5vw, 3.5rem); }
h1:first-child { margin-top: 0; }
h2 { margin-top: 2.2em; font-size: clamp(1.45rem, 3vw, 2.15rem); }
h3 { margin-top: 2em; }

p { margin: 1em 0; }

.byline {
  margin: .5rem 0 2rem;
  color: var(--muted);
  font-family: Arial, Helvetica, sans-serif;
  font-size: .9em;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 2rem auto;
  border-radius: 4px;
}

pre, code { font-family: "DejaVu Sans Mono", Consolas, monospace; }
code { font-size: .88em; }
pre {
  overflow-x: auto;
  padding: 1rem 1.2rem;
  background: #202630;
  color: #f8f4e9;
  border-radius: 6px;
  line-height: 1.45;
}

blockquote {
  margin: 1.5em 0;
  padding: .15em 1.3em;
  border-left: 5px solid var(--accent);
  color: #444b57;
  background: var(--panel);
}

.formula {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: .8em;
  margin: 1.8rem 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.08em;
  text-align: center;
}

.formula .circa { font-size: 1.35em; }
.formula .frazione { display: inline-flex; flex-direction: column; }
.formula .frazione span { padding: .05em .45em; }
.formula .frazione .barra-frazione {
  display: block;
  width: 100%;
  height: 2px;
  padding: 0;
  background: currentColor;
}

table {
  width: 100%;
  margin: 1.5rem 0;
  border-collapse: collapse;
  font-family: Arial, Helvetica, sans-serif;
  font-size: .94em;
}

th, td { padding: .7rem; border: 1px solid var(--line); }
th { background: var(--panel); }
a { color: #8a1730; }
hr { margin: 3rem 0; border: 0; border-top: 1px solid var(--line); }

@media (max-width: 650px) {
  body { font-size: 17px; }
  body > main { width: 100%; margin: 0; padding: 22px; }
  .formula { flex-wrap: wrap; font-size: .95em; }
}