/* ==========================================================================
   base.css — reset and element-level typography. Elements only, no classes.
   ========================================================================== */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--masthead-h) + var(--space-5));
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--step-body);
  font-weight: 400;
  line-height: 1.7;
  font-optical-sizing: auto;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

h1 {
  font-size: var(--step-display);
  font-weight: 620;
  line-height: 1.02;
  letter-spacing: -0.035em;
}

h2 {
  font-size: var(--step-h2);
  letter-spacing: -0.025em;
}

h3 {
  font-size: var(--step-h3);
  letter-spacing: -0.01em;
}

p {
  margin: 0 0 var(--space-4);
  text-wrap: pretty;
}

p:last-child {
  margin-bottom: 0;
}

a {
  color: var(--signal);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
  transition: color var(--fast) var(--ease);
}

a:hover {
  color: var(--signal-hover);
}

:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 3px;
  border-radius: 1px;
}

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

strong {
  font-weight: 600;
}

code,
kbd {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

button {
  font: inherit;
  color: inherit;
  margin: 0;
  cursor: pointer;
}

hr {
  height: 0;
  margin: var(--space-6) 0;
  border: 0;
  border-top: 1px solid var(--rule);
}

svg {
  display: block;
  max-width: 100%;
  height: auto;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}