/* Puzzlr site. The app's look (ink outlines on dotted paper, keycaps with a
   lip), kept quiet for reading. Tokens come from the app's
   lib/theme/app_colors.dart. */

@font-face {
  font-family: "Nunito";
  src: url("fonts/nunito.woff2") format("woff2");
  font-weight: 200 1000;
  font-display: swap;
}
@font-face {
  font-family: "Baloo 2";
  src: url("fonts/baloo2.woff2") format("woff2");
  font-weight: 400 800;
  font-display: swap;
}

:root {
  color-scheme: light;
  --screen: #fffbf3;
  --card: #ffffff;
  --outline: #26242b;
  --ink: #26242b;
  --subtle: #6b6862;
  --muted: #8a8791;
  --dot: rgba(38, 36, 43, 0.10);
  --hairline: #efe9df;
  --key: #ece5d6;
  --primary: #2c9c8f;
  --link: #1d7a6f;
  --tint: #e4f4f1;
  --slate: #7c8088;
  --orange: #e08a3c;
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --screen: #24252b;
    --card: #34353e;
    --outline: #0a0a0d;
    --ink: #f4f1ea;
    --subtle: #c8c4bc;
    --muted: #aaa7b1;
    --dot: rgba(255, 255, 255, 0.05);
    --hairline: #464751;
    --key: #464752;
    --link: #6fd0c3;
    --tint: #27403d;
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  color: var(--ink);
  background-color: var(--screen);
  /* The app's paper: a dot every 16px, 2.2px across. */
  background-image: radial-gradient(circle, var(--dot) 1.1px, transparent 1.6px);
  background-size: 16px 16px;
  background-position: 8px 8px;
  font-family: "Nunito", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 17px;
  font-weight: 500;
  line-height: 1.65;
}

.wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 28px 16px 64px;
}

/* Header: the wordmark, and the way to the other language. */

header.site {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 24px;
}

.wordmark {
  display: inline-flex;
  gap: 3px;
  padding: 2px 2px 5px;
  text-decoration: none;
}
.wordmark span {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  padding-top: 2px;
  border: 2px solid var(--outline);
  border-radius: 7px;
  box-shadow: 0 3px 0 var(--outline);
  color: #fff;
  font-family: "Baloo 2", "Nunito", sans-serif;
  font-weight: 800;
  font-size: 19px;
  line-height: 1;
}
.wordmark span:nth-child(odd) { transform: rotate(-4deg); }
.wordmark span:nth-child(even) { transform: translateY(1px) rotate(3deg); }
.wordmark .t { background: var(--primary); }
.wordmark .s { background: var(--slate); }
.wordmark .o { background: var(--orange); }

/* A keycap: outlined, on a hard lip, and it sinks into the lip when pressed. */

.cap {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 40px;
  padding: 6px 16px;
  border: 2px solid var(--outline);
  border-radius: 12px;
  box-shadow: 0 3px 0 var(--outline);
  background: var(--card);
  color: var(--ink);
  font-weight: 800;
  font-size: 15px;
  line-height: 1.2;
  text-decoration: none;
  transition: transform 60ms ease-out, box-shadow 60ms ease-out;
}
.cap:hover { background: var(--key); }
.cap:active {
  transform: translateY(3px);
  box-shadow: 0 0 0 var(--outline);
}
.cap:focus-visible,
a:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 3px;
}
.cap .arrow { color: var(--muted); font-weight: 700; }

/* The sheet the document is printed on: a card with the outline, no lip,
   since it only shows something. */

main.sheet {
  background: var(--card);
  border: 2px solid var(--outline);
  border-radius: 16px;
  padding: 32px 40px 36px;
}

h1, h2, h3 {
  font-family: "Baloo 2", "Nunito", sans-serif;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.005em;
}
h1 { font-size: 34px; margin: 0 0 6px; }
h2 {
  font-size: 23px;
  margin: 40px 0 10px;
  padding-top: 24px;
  border-top: 2px solid var(--hairline);
}
h3 { font-size: 19px; font-weight: 700; margin: 24px 0 6px; }

.updated {
  margin: 0 0 24px;
  color: var(--subtle);
  font-size: 15px;
  font-weight: 600;
}

.lead { font-size: 18.5px; color: var(--ink); }

p, ul, ol { margin: 0 0 14px; }
ul, ol { padding-left: 22px; }
li { margin: 8px 0; padding-left: 2px; }
li::marker { color: var(--muted); }
strong { font-weight: 800; }

a {
  color: var(--link);
  font-weight: 700;
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
  text-decoration-color: color-mix(in srgb, var(--link) 40%, transparent);
}
a:hover { text-decoration-color: var(--link); }

/* A quiet aside: the tint of the app's teal, outlined. */
.note {
  margin: 18px 0;
  padding: 14px 18px;
  background: var(--tint);
  border: 2px solid var(--outline);
  border-radius: 14px;
}
.note p:last-child { margin-bottom: 0; }

/* Contents list at the top of a long page. */
nav.toc {
  margin: 0 0 8px;
  padding: 14px 18px;
  border: 2px dashed var(--muted);
  border-radius: 14px;
}
nav.toc p {
  margin: 0 0 4px;
  color: var(--subtle);
  font-size: 14px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
nav.toc ol { margin: 0; columns: 2; column-gap: 28px; }
nav.toc li { margin: 0; padding: 3px 0; break-inside: avoid; font-size: 15.5px; }

/* The landing page's doors: cards that open something carry a lip. */
.doors {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin: 8px 0 24px;
}
.doors .cap {
  justify-content: space-between;
  min-height: 56px;
  padding: 12px 18px;
  font-size: 17px;
}
.lang-label {
  margin: 28px 0 10px;
  color: var(--subtle);
  font-size: 14px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

footer {
  margin-top: 28px;
  color: var(--subtle);
  font-size: 14px;
  font-weight: 600;
  text-align: center;
}
footer a { font-weight: 700; }

@media (max-width: 600px) {
  body { font-size: 16.5px; }
  .wrap { padding-top: 20px; }
  main.sheet { padding: 22px 18px 26px; border-radius: 14px; }
  h1 { font-size: 29px; }
  h2 { font-size: 21px; margin-top: 32px; padding-top: 20px; }
  nav.toc ol { columns: 1; }
  .doors { grid-template-columns: 1fr; }
  .wordmark span { width: 26px; height: 26px; font-size: 16px; }
}

@media (prefers-reduced-motion: reduce) {
  .cap { transition: none; }
}

@media print {
  body { background: #fff; color: #000; }
  main.sheet { border: 0; padding: 0; }
  header.site nav, nav.toc { display: none; }
  a { color: #000; }
}