/* chess.do website: the app's palette (design/mockup), light and dark. */
@font-face {
  font-family: Rubik;
  src: url(/assets/Rubik-Regular.ttf) format("truetype");
  font-weight: 400;
  font-display: swap;
}
@font-face {
  font-family: Rubik;
  src: url(/assets/Rubik-Medium.ttf) format("truetype");
  font-weight: 500;
  font-display: swap;
}
:root {
  --canvas: #faf9fc;
  --surface: #fff;
  --ink: #302d40;
  --muted: #6f6980;
  --purple: #7958cf;
  --purple-dark: #6646b1;
  --lilac: #eee8f8;
  --line: #e8e3ee;
  --gold: #f4e2ad;
  --button-ink: #fff;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --canvas: #1b1922;
    --surface: #25222e;
    --ink: #f0edf5;
    --muted: #afa6bd;
    --purple: #ba9af5;
    --purple-dark: #775baf;
    --lilac: #373044;
    --line: #3a3445;
    --gold: #baa164;
    --button-ink: #231a35;
  }
}
* {
  box-sizing: border-box;
}
html {
  -webkit-text-size-adjust: 100%;
}
body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font: 400 17px / 1.65 Rubik, system-ui, sans-serif;
  font-synthesis: none;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
}
a {
  color: var(--purple);
}
a:focus-visible {
  outline: 2px solid var(--purple);
  outline-offset: 3px;
  border-radius: 4px;
}
h1,
h2 {
  font-weight: 500;
  line-height: 1.2;
  margin: 0;
}
h1 {
  font-size: clamp(30px, 6vw, 44px);
  letter-spacing: -.03em;
}
h2 {
  font-size: 20px;
  letter-spacing: -.01em;
  margin-top: 2.2em;
}
p,
ul {
  margin: .8em 0 0;
}
ul {
  padding-left: 1.2em;
}
li + li {
  margin-top: .45em;
}
.skip {
  position: absolute;
  left: -999px;
  top: 8px;
  background: var(--surface);
  padding: 8px 12px;
  border-radius: 8px;
}
.skip:focus {
  left: 16px;
}
.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  max-width: 960px;
  width: 100%;
  margin: 0 auto;
  padding: 18px 16px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 22px;
  font-weight: 500;
  letter-spacing: -.04em;
  color: var(--ink);
  text-decoration: none;
}
.brand b {
  font-weight: inherit;
  color: var(--purple);
}
.top nav,
footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 20px;
  font-size: 15px;
}
.top nav a,
footer nav a {
  color: var(--muted);
  text-decoration: none;
  padding: 6px 0;
}
.top nav a:hover,
footer nav a:hover,
[aria-current="page"] {
  color: var(--purple);
}
main {
  flex: 1;
  width: 100%;
  margin: 0 auto;
  padding: 24px 16px 64px;
}
main.doc {
  max-width: 720px;
}
main.wide {
  max-width: 960px;
}
.updated {
  color: var(--muted);
  font-size: 14px;
}
.hero {
  text-align: center;
  max-width: 620px;
  margin: 32px auto 0;
}
.intro {
  color: var(--muted);
}
.button {
  display: inline-block;
  margin-top: 20px;
  padding: 12px 20px;
  border-radius: 13px;
  background: var(--purple);
  color: var(--button-ink);
  text-decoration: none;
  box-shadow: 0 3px 0 var(--purple-dark);
}
footer {
  border-top: 1px solid var(--line);
  max-width: 960px;
  width: 100%;
  margin: 0 auto;
  padding: 20px 16px 32px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
  font-size: 14px;
}
footer p {
  margin: 0;
  padding: 6px 0;
}

/* Japanese: Rubik has no Japanese glyphs, so name the system Japanese fonts. */
html:lang(ja) body {
  font-family: Rubik, "Hiragino Sans", "Hiragino Kaku Gothic ProN",
    "Noto Sans JP", "Yu Gothic", Meiryo, system-ui, sans-serif;
  line-break: strict;
}