/* wisp.xfun.fun: the app's paper and ink (wisp RULES.md B4). One sheet of paper,
   ink words, one wisp of celadon smoke running down the page. */
:root {
  --paper: #F3EFE6;
  --wash: #EAE4D8;
  --sheet: #F8F5EE;
  --ink: #23211D;
  --soft: #5F5A51;
  --faint: #827C70;
  --rule: #DDD5C6;
  --celadon: #4E7068;
  --mist: #8DB3A8;
  --pc: #E6ECE8;
  --mac: #EFE6DA;
  --serif: "Noto Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --sans: -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #1C1B19;
    --wash: #262421;
    --sheet: #23211E;
    --ink: #E9E4DA;
    --soft: #B0AA9E;
    --faint: #8F897D;
    --rule: #34312C;
    --celadon: #8DB3A8;
    --mist: #5E7F77;
    --pc: #2B3331;
    --mac: #302B25;
  }
}
html:lang(zh-Hant) { --serif: "Noto Serif TC", "Songti TC", "PMingLiU", serif; --sans: -apple-system, "PingFang TC", "Microsoft JhengHei", "Segoe UI", system-ui, sans-serif; }
html:lang(ja) { --serif: "Noto Serif JP", "Hiragino Mincho ProN", "Yu Mincho", serif; --sans: -apple-system, "Hiragino Sans", "Yu Gothic UI", "Meiryo", system-ui, sans-serif; }
html:lang(ko) { --serif: "Noto Serif KR", "AppleMyungjo", "Batang", serif; --sans: -apple-system, "Apple SD Gothic Neo", "Malgun Gothic", system-ui, sans-serif; }
html:lang(en) { --serif: "Noto Serif", Georgia, "Times New Roman", serif; }

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.75 var(--sans);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--ink); }
a:hover { color: var(--celadon); }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
.wrap { max-width: 1120px; margin: 0 auto; padding-left: 24px; padding-right: 24px; }
.soft { color: var(--soft); }
.small { font-size: 14px; }

/* the top line */
.top { display: flex; align-items: center; gap: 24px; flex-wrap: wrap; padding-top: 22px; padding-bottom: 22px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; font: 700 20px var(--serif); }
.brand svg { width: 30px; height: 30px; }
.brand path { fill: none; stroke: var(--celadon); stroke-width: 7; stroke-linecap: round; stroke-linejoin: round; }
.top nav { display: flex; gap: 22px; flex-wrap: wrap; margin-left: auto; font-size: 14px; }
.top nav a { text-decoration: none; }
.lang { position: relative; display: inline-flex; }
.lang select {
  appearance: none; -webkit-appearance: none;
  font: inherit; font-size: 13px; color: var(--soft); cursor: pointer;
  background: transparent; border: 1px solid var(--rule); border-radius: 17px;
  padding: 6px 34px 6px 16px; min-height: 34px;
}
.lang select:hover { border-color: var(--faint); color: var(--ink); }
/* a thin chevron of our own, with room around it */
.lang::after {
  content: ""; position: absolute; right: 15px; top: 50%;
  width: 6px; height: 6px; margin-top: -5px;
  border-right: 1.5px solid var(--faint); border-bottom: 1.5px solid var(--faint);
  transform: rotate(45deg); pointer-events: none;
}

/* first screen */
.hero { display: flex; flex-wrap: wrap; gap: 48px; align-items: center; padding-top: 64px; padding-bottom: 40px; }
.hero-words { flex: 1 1 440px; min-width: 0; }
.hero h1 { margin: 0; font: 700 clamp(36px, 5.6vw, 58px)/1.25 var(--serif); letter-spacing: .01em; }
.hero .sub { margin: 24px 0 0; max-width: 31em; color: var(--soft); }
/* CJK headlines break between words, not inside them */
.hero h1 { text-wrap: balance; line-break: strict; }
html:lang(ja) .hero h1 { font-size: clamp(30px, 4.4vw, 46px); }
html:lang(ko) .hero h1, html:lang(ko) .stop h2 { word-break: keep-all; }
html:lang(ko) body { word-break: keep-all; }
.actions { margin-top: 34px; display: flex; gap: 18px; flex-wrap: wrap; align-items: center; }
.button { display: inline-flex; align-items: center; min-height: 48px; padding: 0 26px; border-radius: 24px; text-decoration: none; font-weight: 500; }
.button.solid { background: var(--ink); color: var(--paper); }
.button.solid:hover { background: var(--celadon); color: var(--paper); }
.button.line { padding: 0 4px; border-radius: 0; border-bottom: 1px solid var(--ink); min-height: 40px; }
.hero-art { flex: 1 1 340px; max-width: 420px; height: auto; margin: 0 auto; }
.hero-art .ink, .hero-art .ink-line { fill: var(--sheet); stroke: var(--ink); stroke-width: 2; stroke-linejoin: round; }
.hero-art .ink-line { fill: none; }
.hero-art .screen-pc { fill: var(--pc); }
.hero-art .screen-mac { fill: var(--mac); }
.hero-art .smoke { fill: none; stroke: var(--celadon); stroke-width: 2.6; stroke-linecap: round; }
.hero-art .puff { fill: var(--mist); }

/* the wisp down the page, and a stop for each section */
.trail { position: relative; padding-bottom: 72px; }
.spine { position: absolute; left: 24px; top: 0; height: 100%; width: 40px; }
.spine path { fill: none; stroke: var(--mist); stroke-width: 2; vector-effect: non-scaling-stroke; }
.stop { position: relative; padding: 40px 0 40px 80px; }
.stop::before {
  content: ""; position: absolute; left: 37px; top: 52px; width: 14px; height: 14px;
  border-radius: 7px; background: var(--paper); border: 2px solid var(--celadon);
}
.stop h2 { margin: 0 0 22px; font: 700 30px/1.35 var(--serif); }
.stop p { margin: 0 0 12px; }
#demo { display: block; width: 100%; max-width: 820px; height: auto; border-radius: 6px; }
/* the film is drawn on paper: dimmed, it sits quietly on ink */
@media (prefers-color-scheme: dark) { #demo { filter: brightness(.82); } }

.three { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 32px; }
.three h3 { margin: 0 0 6px; font-size: 17px; }
.three p { margin: 0; color: var(--soft); font-size: 15px; }

.numbers { display: flex; gap: 56px; flex-wrap: wrap; margin-bottom: 18px; }
.numbers b { display: block; font: 700 44px/1.2 var(--serif); }
.numbers span { color: var(--soft); font-size: 14px; }

.band { margin: 40px 0 40px 80px; padding: 40px; background: var(--wash); border-radius: 10px; }
.band::before { left: -43px; background: var(--celadon); }
.cards { margin-top: 22px; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
.card { display: flex; flex-direction: column; gap: 2px; padding: 22px; background: var(--sheet); border-radius: 8px; text-decoration: none; border: 1px solid transparent; }
.card:hover { border-color: var(--celadon); color: var(--ink); }
.card b { font-size: 19px; }
.card span { color: var(--soft); font-size: 14px; }
.card small { color: var(--faint); font-size: 13px; }
.card .file { margin-top: 10px; font-family: var(--mono); }

#faq-list details { border-top: 1px solid var(--rule); padding: 14px 0; }
#faq-list details:last-child { border-bottom: 1px solid var(--rule); }
#faq-list summary { font-weight: 600; cursor: pointer; list-style-position: outside; }
#faq-list details p { margin: 8px 0 0; color: var(--soft); }

.release { border-top: 1px solid var(--rule); padding: 14px 0; display: grid; grid-template-columns: minmax(0, 8em) minmax(0, 1fr); gap: 16px; }
.release:last-child { border-bottom: 1px solid var(--rule); }
.release .tag { font: 500 14px var(--mono); }
.release .date { display: block; color: var(--faint); font: 400 12px var(--mono); }
.release ul { margin: 0; padding-left: 18px; color: var(--soft); }
.release li + li { margin-top: 4px; }

.dev-links { display: flex; gap: 24px; flex-wrap: wrap; font-size: 15px; }

.foot { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; padding-top: 28px; padding-bottom: 40px; border-top: 1px solid var(--rule); font-size: 13px; color: var(--faint); }

/* phones: the art under the words, the wisp at the left edge */
@media (max-width: 720px) {
  .top nav { order: 3; width: 100%; margin-left: 0; gap: 16px; }
  .lang { margin-left: auto; }
  .hero { padding-top: 32px; gap: 28px; }
  .hero-art { max-width: 280px; }
  .spine { left: 8px; width: 24px; }
  .stop { padding-left: 40px; }
  .stop::before { left: 13px; }
  .band { margin-left: 40px; padding: 24px; }
  .band::before { left: -32px; }
  .three, .cards { grid-template-columns: minmax(0, 1fr); gap: 20px; }
  .release { grid-template-columns: minmax(0, 1fr); gap: 6px; }
  .numbers { gap: 36px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero-art .puff { display: none; }
}