/*
 * Reset, document defaults and typography.
 */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scrollbar-gutter: stable;
}

body {
  margin: 0;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  background: var(--paper);
  color: var(--text-primary);
  font-family: var(--font-interface);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  font-synthesis-weight: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

::selection {
  background: var(--selection-bg);
  color: var(--selection-text);
}

h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0;
  font-family: var(--font-reading);
  font-weight: var(--weight-semibold);
  line-height: var(--leading-tight);
  letter-spacing: -0.011em;
  text-wrap: balance;
}

h1 { font-size: var(--text-3xl); }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }
h5 { font-size: var(--text-md); }

p,
ul,
ol,
dl,
figure,
blockquote,
pre,
table {
  margin: 0;
}

ul,
ol {
  padding: 0;
  list-style: none;
}

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

a {
  color: var(--accent);
  text-decoration-color: color-mix(in oklab, var(--accent) 40%, transparent);
  text-underline-offset: 0.16em;
  text-decoration-thickness: from-font;
}

a:hover {
  color: var(--accent-hover);
  text-decoration-color: currentcolor;
}

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
  margin: 0;
}

button {
  cursor: pointer;
  background: none;
  border: none;
  padding: 0;
  text-align: inherit;
}

button:disabled {
  cursor: not-allowed;
}

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

hr {
  border: none;
  border-top: var(--border-width) solid var(--line);
  margin-block: var(--space-6);
}

table {
  border-collapse: collapse;
  width: 100%;
}

/*
 * Focus. A single high-contrast ring is used everywhere, and it is never
 * removed: keyboard navigation is a supported way to use the forum, not a
 * fallback.
 */
:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
  border-radius: var(--radius-sm);
}

/* Honour a reader who asked the system for less motion. */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  z-index: var(--z-skip);
  top: var(--space-2);
  left: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: var(--accent);
  color: var(--text-on-accent);
  border-radius: var(--radius-sm);
  font-weight: var(--weight-semibold);
  text-decoration: none;
  transform: translateY(calc(-100% - var(--space-4)));
  transition: transform var(--duration-base) var(--easing);
}

.skip-link:focus-visible {
  transform: translateY(0);
  color: var(--text-on-accent);
}

[hidden] {
  display: none !important;
}