@import url("https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600&family=Space+Mono:wght@700&display=swap");

:root { --blue:#075cff; --ink:#111318; --muted:#69717c; --line:#cfd5dd; --paper:#f8f9fb; }
* { box-sizing:border-box; }
body { margin:0; color:var(--ink); background:var(--paper); font-family:"DM Sans",sans-serif; -webkit-font-smoothing:antialiased; }
header,main { width:min(920px,calc(100% - 40px)); margin-inline:auto; }
header { height:76px; display:flex; align-items:center; gap:12px; border-bottom:1px solid #dfe3e8; font-size:16px; font-weight:600; }
.mark { width:36px; height:36px; display:grid; place-items:center; color:#fff; background:var(--blue); font:700 22px/1 "Space Mono",monospace; }
main { padding:80px 0 120px; }
.timeline-heading { display:flex; align-items:center; justify-content:space-between; margin-bottom:90px; }
h1 { margin:0; font-size:32px; letter-spacing:-.04em; font-weight:600; }
.timeline-frame { display:grid; grid-template-columns:44px minmax(0,1fr) 44px; gap:12px; }
.timeline-button { align-self:start; width:44px; height:44px; margin-top:57px; padding:0; color:var(--ink); border:1px solid var(--line); background:var(--paper); font-size:20px; cursor:pointer; z-index:2; }
.timeline-button:hover,.timeline-button:focus-visible { color:#fff; border-color:var(--blue); background:var(--blue); outline:none; }
.timeline-scroll { overflow-x:auto; padding-bottom:20px; }
.timeline { position:relative; min-height:390px; }
.scale { display:flex; }
.year-block { flex:0 0 360px; color:var(--ink); font:700 12px/1 "Space Mono",monospace; }
.year-block strong { display:block; margin-bottom:30px; }
.year-block > div { display:grid; grid-template-columns:repeat(12,1fr); color:var(--muted); font-size:9px; text-align:center; }
.year-block span::after { content:""; display:block; width:1px; height:8px; margin:17px auto 0; background:var(--line); }
.year-block span:first-child { color:var(--blue); }
.year-block span:first-child::after { height:14px; margin-top:11px; background:var(--ink); }
.line { position:absolute; top:79px; left:15px; right:15px; height:1px; background:var(--line); }
.line::before,.line::after { content:""; position:absolute; top:-3px; width:7px; height:7px; border-radius:50%; background:var(--line); }
.line::before { left:0; }
.line::after { right:0; }
details { position:absolute; top:58px; width:300px; transform:translateX(-50%); }
summary { position:relative; display:grid; grid-template-rows:42px 30px; justify-items:center; width:100px; margin-inline:auto; cursor:pointer; list-style:none; user-select:none; }
summary::-webkit-details-marker { display:none; }
.dot { align-self:center; width:13px; height:13px; border:3px solid var(--paper); border-radius:50%; background:var(--blue); box-shadow:0 0 0 1px var(--blue); transition:transform .18s ease; }
summary:hover .dot, details[open] .dot { transform:scale(1.35); }
.name { font-size:15px; font-weight:600; white-space:nowrap; }
.name small { display:block; margin-top:3px; color:var(--muted); font:700 9px/1.2 "Space Mono",monospace; }
.info { margin-top:24px; padding:22px; border-left:2px solid var(--blue); background:#fff; box-shadow:0 8px 30px rgba(24,40,72,.06); }
.info p { margin:0; color:var(--muted); font-size:15px; line-height:1.7; }
.info a { display:inline-block; margin-top:18px; color:var(--blue); font-size:13px; font-weight:600; text-decoration:none; }
.info a:hover { text-decoration:underline; }

@media (max-width:560px) {
  header,main { width:min(100% - 30px,920px); }
  header { height:64px; }
  main { padding:54px 0 80px; }
  .timeline-heading { margin-bottom:65px; }
  h1 { font-size:28px; }
  details { width:280px; }
}