/* Reset, browser surfaces, and primitives. */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-weight: 400;
  font-size: var(--text-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg { display: block; max-width: 100%; }
h1, h2, h3, p { margin: 0; }
a { color: inherit; }
button { font: inherit; color: inherit; }

/* browser surfaces, themed */
::selection { background: var(--adaire-oak); color: var(--adaire-ivory-ink); }
[data-theme="dark"] ::selection { background: var(--adaire-ivory-ink); color: var(--adaire-oak); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }
html { scrollbar-color: var(--adaire-line-strong) var(--adaire-ivory); }

/* primitives */
.container {
  width: 100%;
  max-width: calc(var(--content-max) + 2 * var(--gutter));
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.serif {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 500;
}
.visually-hidden {
  position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* buttons: design.md §7.1 */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--s-2);
  min-height: 48px; padding: 12px 22px;
  border-radius: var(--r-control);
  font-weight: 500; font-size: 1rem; line-height: 1; letter-spacing: 0;
  text-decoration: none; cursor: pointer; white-space: nowrap;
  border: 1px solid transparent;
  transition: background-color var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out),
              color var(--dur-fast) var(--ease-out),
              transform var(--dur-fast) var(--ease-out);
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--btn-primary-bg); color: var(--btn-primary-fg); border-color: var(--btn-primary-bg); }
.btn-primary:hover { background: var(--btn-primary-bg-hover); border-color: var(--btn-primary-bg-hover); }
.btn-secondary { background: transparent; color: var(--text); border-color: var(--text); }
.btn-secondary:hover { background: color-mix(in srgb, var(--text) 6%, transparent); }
.btn-sm { min-height: 40px; padding: 8px 18px; font-size: var(--text-small); }

/* text link: hairline underline, brass on hover */
.link {
  text-decoration: underline; text-decoration-color: var(--border-strong);
  text-underline-offset: 0.22em; text-decoration-thickness: 1px;
  transition: text-decoration-color var(--dur-fast) var(--ease-out);
}
.link:hover { text-decoration-color: var(--accent); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
  html { scroll-behavior: auto; }
}