:root {
  --ink: #0b1f3a;
  --teal: #1d4ed8;
  --cream: #f8fbff;
  --paper: #f0f5fb;
  --paper-warm: #e4eef8;
  --border: #c5d4e8;
  --muted: #5b6b7c;
  --font-display: Georgia, 'Times New Roman', serif;
  --font-body: 'Source Sans 3', 'Segoe UI', sans-serif;
}

* { box-sizing: border-box; }

html,
body {
  margin: 0;
  padding: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.55;
}

.guide {
  max-width: 48rem;
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
}

h1,
h2,
h3 {
  font-family: var(--font-display);
  line-height: 1.25;
}

h1 { font-size: 2rem; margin: 0 0 0.75rem; }
h2 { font-size: 1.35rem; margin: 2rem 0 0.75rem; }
h3 { font-size: 1.1rem; margin: 1.5rem 0 0.5rem; }

p,
li { color: var(--ink); }

.muted,
em { color: var(--muted); }

a { color: var(--teal); }

hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 1.5rem 0;
}

ul,
ol { padding-left: 1.25rem; }

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--cream);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  margin: 1rem 0;
  font-size: 0.95rem;
}

th,
td {
  text-align: left;
  padding: 0.65rem 0.85rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

th {
  background: var(--paper-warm);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
}

img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 1rem 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--cream);
}

code {
  font-size: 0.9em;
  background: var(--paper-warm);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}