*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

h1, h2, h3, h4, h5 {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--brand-primary);
  line-height: 1.25;
}

code, pre, .math-display { font-family: var(--font-mono); }

.brand-endorsement {
  font-size: 0.8rem;
  color: var(--color-muted);
  margin-top: 6px;
}

a { color: var(--brand-primary); }

button { font-family: inherit; }

.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap;
}