:root {
  color-scheme: dark;
  --bg: #071222;
  --ink: #f5f8fc;
  --muted: #bdcbdc;
  --line: #2a3d54;
  --yellow: #facc15;
  --blue: #78c7ff;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
.shell { width: min(740px, calc(100% - 40px)); margin-inline: auto; }
a { color: var(--blue); text-underline-offset: 3px; }
a:focus-visible, summary:focus-visible { outline: 3px solid var(--yellow); outline-offset: 4px; }
.site-header { padding: 20px 0 16px; border-bottom: 1px solid var(--line); }
.brand { display: inline-flex; align-items: center; gap: 9px; color: var(--ink); font-size: 20px; font-weight: 800; text-decoration: none; }
.brand img { border-radius: 9px; }
.skip-link { position: absolute; left: 16px; top: -100px; background: var(--yellow); color: var(--bg); padding: 10px 16px; }
.skip-link:focus { top: 10px; }
h1 { font-size: clamp(28px, 4.5vw, 40px); line-height: 1.15; letter-spacing: -.035em; margin: 27px 0 22px; }
h2 { font-size: 18px; line-height: 1.3; margin: 0 0 5px; letter-spacing: -.015em; }
p { margin: 0; color: var(--muted); font-size: 16px; }
strong { color: var(--ink); }
.before-start { border-left: 4px solid var(--yellow); border-radius: 0 10px 10px 0; padding: 16px 18px; background: #19251c; margin-bottom: 14px; }
.before-start h2 { color: var(--yellow); margin-bottom: 7px; }
.before-start p { color: #e3e8d7; }
.steps { list-style: none; padding: 0; margin: 0; counter-reset: instruction; }
.steps[start="3"] { counter-reset: instruction 2; }
.in-app { margin: 24px 0 6px; padding: 20px 22px; border-radius: 12px; background: #c8eeff; color: #071222; }
.in-app h2 { font-size: 25px; margin-bottom: 5px; }
.in-app p { color: #17334a; }
.steps > li { counter-increment: instruction; position: relative; padding: 16px 0 16px 45px; border-bottom: 1px solid var(--line); }
.steps > li:before { content: counter(instruction); position: absolute; left: 0; top: 17px; width: 29px; height: 29px; display: grid; place-items: center; background: #123651; color: var(--blue); border-radius: 8px; font-size: 16px; font-weight: 800; }
.steps .small { font-size: 13px; margin-top: 5px; color: #9caec3; }
.install-link { display: inline-block; margin-top: 9px; font-size: 14px; font-weight: 700; }
.install-options { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin-top: 14px; }
.install-option { min-width: 0; padding: 16px; border: 1px solid var(--line); border-radius: 10px; background: #0d1d32; }
.install-option h3 { font-size: 18px; line-height: 1.3; margin: 0; }
.install-option .install-link { margin: 8px 0 12px; }
.install-option p { font-size: 14px; }
.extra-details { border: 1px solid var(--line); border-radius: 12px; margin: 25px 0 32px; background: #0d1d32; }
summary { padding: 15px 18px; cursor: pointer; font-size: 15px; font-weight: 750; color: var(--blue); }
.detail-copy { padding: 2px 18px 20px; }
.detail-copy h2 { margin-top: 19px; font-size: 17px; }
.detail-copy p { font-size: 15px; }
.detail-copy p + p { margin-top: 7px; }
footer { padding: 0 0 27px; color: #8fa2b9; font-size: 12px; }
@media (max-width: 560px) {
  .install-options { grid-template-columns: 1fr; }
}
@media (max-width: 420px) {
  .shell { width: calc(100% - 32px); }
  .site-header { padding: 16px 0 13px; }
  h1 { margin-top: 23px; font-size: 29px; }
  .before-start { padding: 14px; }
  .before-start h2, .steps h2 { font-size: 17px; }
  .steps > li { padding: 14px 0 14px 40px; }
  .steps > li:before { top: 15px; width: 27px; height: 27px; }
  p { font-size: 15px; }
}