:root{
  --bg:#e9e9e9; --surface:#f6f6f6; --ink:#1b1b1b; --mid:#6b6b6b; --line:#c9c9c9;
  --display:'Syne',sans-serif; --body:'Space Grotesk',sans-serif;
}
@media (prefers-color-scheme:dark){
  :root{--bg:#161616; --surface:#1f1f1f; --ink:#ececec; --mid:#8f8f8f; --line:#383838;}
}
*{box-sizing:border-box;margin:0}
html,body{height:100%}
body{background:var(--bg);color:var(--ink);font-family:var(--body);overflow:hidden;-webkit-font-smoothing:antialiased}
:focus-visible{outline:2px solid var(--ink);outline-offset:3px}

.top{position:fixed;inset:0 0 auto 0;display:flex;justify-content:space-between;align-items:center;gap:16px;padding:22px 32px;z-index:5;pointer-events:none}
.top>*{pointer-events:auto}
.logo{font-family:var(--display);font-weight:800;font-size:clamp(1.4rem,3vw,2rem);letter-spacing:-.03em}
.search{display:flex;border-bottom:1px solid var(--ink)}
.search input{background:none;border:0;color:var(--ink);font:300 .95rem var(--body);padding:8px 4px;width:min(34vw,260px);outline:none}
.search input::placeholder{color:var(--mid)}
.search button{background:none;border:0;color:var(--ink);font:500 .9rem var(--body);cursor:pointer;padding:0 6px}

#field{position:fixed;inset:0;overflow:hidden}
.node{
  position:absolute;left:0;top:0;border-radius:50%;
  display:grid;place-items:center;text-align:center;padding:10%;
  background:var(--surface);color:var(--ink);border:1px solid var(--ink);
  font:600 clamp(.72rem,1.1vw,.95rem)/1.15 var(--display);letter-spacing:-.01em;
  cursor:pointer;user-select:none;touch-action:none;will-change:transform;
  transition:background .25s,color .25s,border-color .25s;
}
.node.hot{background:var(--ink);color:var(--bg)}
.node.grab{cursor:grabbing}
.node.loading{animation:pulse 1s infinite}
@keyframes pulse{50%{opacity:.45}}
.hint{position:fixed;bottom:18px;left:0;right:0;text-align:center;color:var(--mid);font-size:.8rem;font-weight:300;pointer-events:none}

.panel{
  position:fixed;inset:0;z-index:10;background:var(--bg);display:grid;grid-template-columns:280px 1fr;
  transform:translateY(100%);transition:transform .55s cubic-bezier(.7,0,.2,1);overflow:hidden
}
.panel.open{transform:none}
.close{position:absolute;top:22px;right:32px;background:none;border:1px solid var(--ink);color:var(--ink);font:500 .85rem var(--body);padding:8px 18px;border-radius:99px;cursor:pointer;z-index:2}
.close:hover{background:var(--ink);color:var(--bg)}
.modules{border-right:1px solid var(--line);padding:90px 24px 24px;overflow:auto;display:flex;flex-direction:column;gap:4px}
.modules h2{font-family:var(--display);font-weight:800;font-size:1.5rem;letter-spacing:-.03em;margin-bottom:18px}
.mod{background:none;border:0;text-align:left;color:var(--mid);font:400 .95rem/1.3 var(--body);padding:10px 12px;border-left:2px solid transparent;cursor:pointer}
.mod:hover{color:var(--ink)}
.mod.active{color:var(--ink);border-left-color:var(--ink);font-weight:500}
.mod.done::after{content:" ✓";color:var(--mid)}
.content{padding:90px clamp(24px,6vw,96px) 60px;overflow:auto}
.content .inner{max-width:68ch}
.content h2{font-family:var(--display);font-weight:800;font-size:clamp(2rem,5vw,3.6rem);letter-spacing:-.04em;line-height:1;margin-bottom:28px}
.content p{font-weight:300;font-size:1.05rem;line-height:1.7;margin-bottom:1.1em}
.content h3{font:500 1rem var(--body);margin:32px 0 10px}
.content ul{padding-left:1.1em;font-weight:300;line-height:1.7}
.nav{display:flex;gap:10px;margin-top:40px;flex-wrap:wrap}
.nav button,.chip{background:none;border:1px solid var(--ink);color:var(--ink);font:400 .9rem var(--body);padding:9px 18px;border-radius:99px;cursor:pointer}
.nav button:hover,.chip:hover{background:var(--ink);color:var(--bg)}
.nav button:disabled{opacity:.3;pointer-events:none}
.chips{display:flex;gap:8px;flex-wrap:wrap}
.state{color:var(--mid);font-weight:300}
.dots::after{content:"";animation:d 1.2s steps(4) infinite}
@keyframes d{0%{content:""}25%{content:"."}50%{content:".."}75%{content:"..."}}

@media(max-width:760px){
  .top{padding:16px}.search input{width:36vw}
  .panel{grid-template-columns:1fr;grid-template-rows:auto 1fr}
  .modules{flex-direction:row;overflow-x:auto;padding:64px 12px 8px;border-right:0;border-bottom:1px solid var(--line)}
  .modules h2{display:none}.mod{white-space:nowrap;border-left:0;border-bottom:2px solid transparent}
  .mod.active{border-bottom-color:var(--ink)}
  .close{right:16px;top:14px}
}
@media(prefers-reduced-motion:reduce){.panel{transition:none}.node.loading{animation:none}}