/* Base layer. Reset, typography, focus, theme transition. */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* Theme swap is a variable change, so only colour needs to ease. */
body,
.panel,
.btn,
.field__input,
.nav,
.rail {
  transition: background-color var(--t-base) var(--ease),
    color var(--t-base) var(--ease), border-color var(--t-base) var(--ease);
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.06;
  text-wrap: balance;
}

p {
  margin: 0;
  text-wrap: pretty;
}

a {
  color: inherit;
  text-decoration: none;
}

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

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

hr {
  border: 0;
  border-top: var(--hair) solid var(--line);
  margin: 0;
}

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

/* Focus is never removed. */
:focus-visible {
  outline: 2px solid var(--text);
  outline-offset: 3px;
  border-radius: 2px;
}

/* Scrollbar, dark friendly */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--line-strong) transparent;
}

*::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

*::-webkit-scrollbar-thumb {
  background: var(--line-strong);
  border-radius: var(--r-pill);
  border: 3px solid var(--bg);
}

/* Utility */

.mono {
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-3);
  font-weight: 500;
}

.label {
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-3);
}

.lead {
  font-size: var(--fs-md);
  color: var(--text-2);
  max-width: 60ch;
}

.muted {
  color: var(--text-2);
}

.dim {
  color: var(--text-3);
}

.skip {
  position: absolute;
  left: var(--s4);
  top: -100px;
  z-index: 200;
  padding: var(--s3) var(--s5);
  background: var(--invert-bg);
  color: var(--invert-text);
  border-radius: var(--r);
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  transition: top var(--t-base) var(--ease);
}

.skip:focus {
  top: var(--s4);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.ico {
  width: 20px;
  height: 20px;
  flex: none;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.ico--sm {
  width: 16px;
  height: 16px;
}

.ico--lg {
  width: 28px;
  height: 28px;
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}