:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --text: #1d1d1f;
  --text-soft: #5f6368;

  --text-faint: #74747a;
  --line: #e5e5e7;
  --accent: #4b56c0;
  --pill: #f1f1f4;
  --page: 760px;

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
          Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
}

:root { --selection: #d7e0ff; }

@media (prefers-color-scheme: dark) {
  :root { --selection: #333a70; }
}

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

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 32px;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--text);
  background: var(--bg);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--accent);
  text-underline-offset: 3px;
}

a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 100;
  padding: 8px 12px;

  color: var(--bg);
  background: var(--accent);
  border-radius: 6px;
  transform: translateY(-150%);
}

.skip-link:focus { transform: translateY(0); }

.site-header {
  border-bottom: 1px solid var(--line);
  background: var(--bg);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  width: min(calc(100% - 40px), var(--page));
  min-height: 64px;
  margin: 0 auto;
}

.brand {
  display: inline-flex;
  align-items: center;
}

.brand-name {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text);
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.brand-mark {
  flex: none;
  width: 18px;
  height: 18px;
}

.brand-context {
  margin-left: 11px;
  padding-left: 11px;
  color: var(--text-faint);
  border-left: 1px solid var(--line);
  font-size: 13px;
  font-weight: 500;
  text-decoration: none;
}

.brand-context:hover { color: var(--text-soft); }

.nav-links {
  display: flex;
  align-items: center;
  align-self: stretch;
  gap: 28px;
}

.nav-links a {
  position: relative;
  display: inline-flex;
  align-items: center;
  color: var(--text-soft);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
}

.nav-links > a {
  padding: 12px 0;
  margin: -12px 0;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] { color: var(--text); }

.lang-menu {
  display: flex;
  align-items: center;
  position: relative;
  margin-left: -8px;
  padding-left: 20px;
  border-left: 1px solid var(--line);
}

.lang-menu__btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;

  margin: -8px 0;
  padding: 8px 0;
  color: var(--text-soft);
  background: none;
  border: 0;
  font: inherit;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;

  -webkit-user-select: none;
  user-select: none;
}

.lang-menu__btn:hover,
.lang-menu.is-open .lang-menu__btn { color: var(--text); }

.lang-menu__chev { width: 11px; height: 11px; flex: 0 0 auto; opacity: 0.75; }

.lang-menu__label { display: inline-grid; }

.lang-menu__label > * { grid-area: 1 / 1; text-align: center; }
.lang-menu__ghost { visibility: hidden; }

.lang-menu__list {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  z-index: 20;
  min-width: 148px;
  margin: 0;
  padding: 5px;
  list-style: none;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 10px;
  box-shadow: 0 8px 24px rgb(0 0 0 / 0.10);
  display: none;
}

@media (prefers-color-scheme: dark) {
  .lang-menu__list {
    background: #1a1b1f;
    box-shadow: 0 8px 24px rgb(0 0 0 / 0.5);
  }
}

.lang-menu.is-open .lang-menu__list { display: block; }

.lang-menu__item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  width: 100%;
  padding: 7px 9px;
  color: var(--text);
  background: none;
  border: 0;
  border-radius: 6px;
  font: inherit;
  font-size: 14px;
  text-align: left;
  cursor: pointer;
}

.lang-menu__item:hover { background: var(--pill); }

.nav-links .lang-menu__item {
  position: static;
  display: flex;
  color: var(--text);
  font-weight: 400;
}

.lang-menu__check {
  width: 13px;
  height: 13px;
  flex: 0 0 auto;
  color: var(--accent);
  visibility: hidden;
}

.lang-menu__item.is-active .lang-menu__check { visibility: visible; }

[hidden] { display: none !important; }

.nav-links a[aria-current="page"]::after {
  content: "";
  position: absolute;
  right: 0;

  bottom: 11px;
  left: 0;
  height: 2px;
  background: var(--text);
}

.hero {
  width: min(calc(100% - 40px), var(--page));
  margin: 0 auto;
  padding: 56px 0 28px;
}

h1 {
  max-width: 680px;
  margin: 0;
  font-size: clamp(38px, 6vw, 46px);
  line-height: 1.1;
  font-weight: 600;
  letter-spacing: -0.035em;
  text-wrap: balance;
}

.hero-copy {
  max-width: 660px;
  margin: 14px 0 0;
  color: var(--text-soft);
  font-size: 17px;
  line-height: 1.65;
}

.layout {
  display: block;
  width: min(calc(100% - 40px), var(--page));
  margin: 0 auto 80px;
}

.content-card {
  padding-top: 26px;
  border-top: 1px solid var(--line);
}

.content-card .updated {
  display: inline-block;
  margin: 0 0 4px;
  color: var(--text-faint);
  font-size: 13px;
}

.content-card h2 {
  margin: 38px 0 8px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
  font-size: 22px;
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.02em;
}

.content-card h2:first-of-type {
  margin-top: 26px;
  padding-top: 0;
  border-top: 0;
}

.content-card h3 {
  margin: 26px 0 6px;
  font-size: 17px;
  font-weight: 600;
}

.content-card p {
  margin: 12px 0 0;
  color: var(--text-soft);
}

.content-card ul,
.content-card ol {
  margin: 14px 0 0;
  padding-left: 22px;
  color: var(--text-soft);
}

.content-card li {
  margin: 7px 0;
  padding-left: 3px;
}

.app-directory {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 36px;
  margin: 26px 0 0;
}

.app-list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.app-list--family {
  gap: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 16px;
}

.app-list--family .app-card {
  border: 0;
  border-radius: 0;
}

.app-list--family li + li { border-top: 1px solid var(--line); }

.app-card {
  display: flex;
  align-items: flex-start;

  gap: 16px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 16px;
}

.app-icon {
  flex: 0 0 auto;
  width: 92px;
  height: 92px;
  margin: -8px 0 -9px -8px;
}

.app-body { min-width: 0; }

.app-name {
  display: flex;
  align-items: center;
  flex-wrap: wrap;

  gap: 5px 10px;
  margin: 0;
  font-size: 19px;
  font-weight: 600;

  line-height: 1.3;
  letter-spacing: -0.025em;
}

.app-os {
  flex: none;
  padding: 2px 8px;
  color: var(--text-soft);
  background: var(--pill);
  border-radius: 6px;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: normal;
}

.app-tagline {
  margin: 3px 0 0;
  font-size: 15px;
  font-weight: 500;
}

.app-desc {
  margin: 7px 0 0;
  color: var(--text-soft);
  font-size: 15px;
  line-height: 1.55;
}

.app-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 5px 13px;
  margin-top: 11px;
}

.app-site {
  display: inline-block;
  margin: 11px 0 0;
  color: var(--accent);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
}

.app-links .app-site { margin-top: 0; }

.app-links .app-site + .app-site {
  padding-left: 13px;
  border-left: 1px solid var(--line);
}

.app-site:hover { text-decoration: underline; }

.site-footer {
  padding: 32px 20px 44px;
  border-top: 1px solid var(--line);
  text-align: center;
}

.site-footer p {
  margin: 0;
  color: var(--text-faint);
  font-size: 13px;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 8px 18px;
  margin-bottom: 8px;
}

.footer-links,
.footer-social {
  display: flex;
  align-items: center;
  gap: 18px;
}

.footer-social::before {
  content: "";
  width: 1px;
  height: 13px;
  background: var(--line);
}

.footer-links a,
.footer-social a {

  padding: 8px 0;
  margin: -8px 0;
  color: var(--text-soft);
  font-size: 13px;
  text-decoration: none;
}

.footer-links a:hover,
.footer-social a:hover { color: var(--text); }

@media (max-width: 560px) {
  .nav,
  .hero,
  .layout { width: min(calc(100% - 32px), var(--page)); }
  .hero { padding: 42px 0 24px; }
  .content-card { padding-top: 22px; }
  .nav-links { gap: 18px; }
  .brand-context { display: none; }
  .lang-menu { margin-left: -4px; padding-left: 14px; }
  .app-card { gap: 12px; padding: 18px; }
  .app-icon { width: 72px; height: 72px; margin: -6px 0 -7px -6px; }
  .app-name { font-size: 18px; }
  .app-links { align-items: flex-start; flex-direction: column; }
  .app-links .app-site + .app-site {
    padding-left: 0;
    border-left: 0;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111214;
    --text: #f2f2f3;
    --text-soft: #b1b3b8;
    --text-faint: #85878d;
    --line: #2c2d31;
    --accent: #aab0ff;
    --pill: #26272c;
  }
}

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

@media print {
  :root { color-scheme: light; }
  .site-header,
  .site-footer,
  .skip-link { display: none; }
  body { color: #000; background: #fff; }
  .hero,
  .layout { width: 100%; }
  .hero { padding: 20px 0; }
  a { color: #000; }
}