:root{
  --bg:#0a0a14;
  --panel:rgba(255,255,255,.045);
  --panel-2:rgba(255,255,255,.08);
  --line:rgba(214,210,240,.14);
  --line-2:rgba(214,210,240,.30);
  --text:#efeef7;
  --text-2:#b6b3ce;
  --text-3:#827da0;
  --text-4:#565073;
  --accent:#8d7bf0;
  --good:#5fd0a0;
  --bubble:#e3a63f;
  --insertion:#e0607a;
  --quick:#3fb6c2;
  --merge:#9a7bea;
  --sans:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;
  --serif:'Instrument Serif',Georgia,'Times New Roman',serif;
  --mono:'IBM Plex Mono',ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
*{margin:0;padding:0;box-sizing:border-box}
[hidden]{display:none !important}
body.boot *{transition:none !important; animation:none !important}
html,body{height:100%}
body{
  background:var(--bg); color:var(--text); font-family:var(--sans);
  -webkit-font-smoothing:antialiased;
  background-image:radial-gradient(130% 95% at 50% -8%, #15152a 0%, #0e0e1c 52%, #07070d 100%);
  background-attachment:fixed;
}
:focus-visible{outline:2px solid var(--accent); outline-offset:2px; border-radius:6px}
button{font-family:inherit; color:inherit; background:none; border:none}

.page{display:flex; flex-direction:column; min-height:100vh}

/* ---------- top bar ---------- */
.bar{
  display:flex; justify-content:space-between; align-items:center; gap:12px;
  padding:max(14px, env(safe-area-inset-top)) 20px 0; flex:none;
}
.home,.icon{
  display:inline-flex; align-items:center; gap:7px; height:38px;
  color:var(--text); text-decoration:none; font:500 14px/1 var(--sans);
  background:var(--panel); border:1px solid var(--line); border-radius:999px;
  cursor:pointer; transition:background .15s, border-color .15s;
}
.home{padding:0 14px 0 10px}
.home span{font-family:var(--serif); font-size:18px; letter-spacing:.01em}
.icon{width:38px; justify-content:center; padding:0}
.home:hover,.icon:hover{background:var(--panel-2); border-color:var(--line-2)}

/* ---------- layout ---------- */
main{
  flex:1; display:grid; grid-template-columns:minmax(0,1fr) 322px;
  gap:24px; padding:10px 20px max(22px, env(safe-area-inset-bottom));
  align-items:start; align-content:start;
  width:100%; max-width:1128px; margin:0 auto;
}
.stage{display:flex; flex-direction:column; gap:14px; min-width:0}
.titleblock{max-width:680px; padding:6px 2px 2px}
.kicker{font-size:11.5px; font-weight:600; letter-spacing:.15em; text-transform:uppercase; color:var(--text-3)}
h1{
  font-family:var(--serif); font-weight:400; font-size:clamp(32px, 4.2vw, 54px);
  line-height:1; letter-spacing:-.01em; margin:4px 0 8px;
}
.sub{font-size:14.5px; line-height:1.55; color:var(--text-2); max-width:66ch}
.sub b{font-weight:600; color:var(--text)}
.lbl{
  font-size:11px; font-weight:600; letter-spacing:.12em; text-transform:uppercase;
  color:var(--text-3); display:flex; justify-content:space-between; align-items:baseline; gap:8px;
}
.lbl .hint{
  font:600 11px/1 var(--mono); letter-spacing:.02em; text-transform:none; color:var(--accent);
}
.srlive{position:absolute; width:1px; height:1px; overflow:hidden; clip:rect(0 0 0 0); white-space:nowrap}

/* ---------- lanes ---------- */
.lanes{display:flex; flex-direction:column; gap:9px}
.lane{
  position:relative; width:100%; height:clamp(66px, 13.5vw, 98px); overflow:hidden;
  border-radius:13px; background:#0c0c16; border:1px solid var(--line);
  box-shadow:0 14px 30px -24px #000, 0 1px 0 rgba(230,228,245,.05) inset;
  isolation:isolate; transition:border-color .2s;
}
.lane canvas{display:block; width:100%; height:100%}
.lane .tag{
  position:absolute; left:10px; top:8px; display:flex; align-items:center; gap:6px;
  font:600 11.5px/1 var(--sans); letter-spacing:.02em; color:rgba(239,238,247,.88);
  text-shadow:0 1px 6px rgba(0,0,0,.85); pointer-events:none;
}
.lane .dot{width:8px; height:8px; border-radius:50%; box-shadow:0 0 6px currentColor; flex:none}
.lane.bubble .dot{background:var(--bubble); color:var(--bubble)}
.lane.insertion .dot{background:var(--insertion); color:var(--insertion)}
.lane.quick .dot{background:var(--quick); color:var(--quick)}
.lane.merge .dot{background:var(--merge); color:var(--merge)}
.lane .badge{
  position:absolute; right:10px; top:8px; font:600 11px/1 var(--mono); letter-spacing:.02em;
  padding:3px 8px; border-radius:999px; background:rgba(6,7,12,.6); color:var(--text-3);
  text-shadow:none; pointer-events:none; opacity:0; transform:translateY(-3px);
  transition:opacity .2s, transform .2s;
}
.lane.done .badge{opacity:1; transform:translateY(0)}
.lane.done{border-color:rgba(95,208,160,.4)}
.lane.done .badge{color:var(--good); background:rgba(14,22,18,.65)}

/* ---------- panel ---------- */
.panel{
  display:flex; flex-direction:column; gap:14px; position:sticky; top:12px;
  background:var(--panel); border:1px solid var(--line); border-radius:16px;
  padding:14px 15px 13px;
}
.grp{display:flex; flex-direction:column; gap:8px}
.note{font-size:11.5px; line-height:1.5; color:var(--text-3)}
.note b{color:var(--text-2); font-weight:600}

input[type=range]{
  -webkit-appearance:none; appearance:none; width:100%; height:26px;
  background:transparent; cursor:pointer; display:block;
}
input[type=range]::-webkit-slider-runnable-track{
  height:5px; border-radius:99px; background:rgba(255,255,255,.13);
}
input[type=range]::-moz-range-track{height:5px; border-radius:99px; background:rgba(255,255,255,.13)}
input[type=range]::-webkit-slider-thumb{
  -webkit-appearance:none; appearance:none; width:19px; height:19px; margin-top:-7px;
  border-radius:50%; background:var(--accent); border:none;
  box-shadow:0 1px 5px rgba(0,0,0,.5), 0 0 0 1px rgba(0,0,0,.25);
}
input[type=range]::-moz-range-thumb{
  width:19px; height:19px; border-radius:50%; background:var(--accent); border:none;
  box-shadow:0 1px 5px rgba(0,0,0,.5);
}

.matrow{display:flex; flex-wrap:wrap; gap:6px}

.readout{
  border-radius:11px; padding:10px 12px; border:1px solid var(--line);
  background:var(--panel-2); font-size:12.5px; line-height:1.5; color:var(--text-2);
}
.readout.alt{background:none; border-color:var(--line); font-size:11.5px}
.readout.alt dl{display:grid; grid-template-columns:auto 1fr; gap:6px 10px; align-items:baseline}
.readout.alt dt{color:var(--text-3)}
.readout.alt dd{font:600 11.5px/1.3 var(--mono); color:var(--text); text-align:right}
.readout.alt dd span{color:var(--text-3); font-weight:400}

.btn{
  display:flex; align-items:center; justify-content:center; text-align:center; gap:8px;
  padding:0 10px; height:34px; border-radius:10px; cursor:pointer; flex:1 1 auto; min-width:0;
  background:var(--panel-2); border:1px solid var(--line);
  font:600 12px/1 var(--sans); color:var(--text-2);
  transition:background .14s, border-color .14s, transform .08s, color .14s, opacity .14s;
}
.btn:hover{background:rgba(255,255,255,.12); border-color:var(--line-2); color:var(--text)}
.btn:active{transform:translateY(1px)}
.btn:disabled{opacity:.45; cursor:default}
.btn.primary{background:rgba(141,123,240,.22); border-color:rgba(141,123,240,.5); color:#e3ddff}
.btn.primary:hover{background:rgba(141,123,240,.32)}

.btn.chip[aria-pressed="false"]{opacity:.4}
.btn.chip.bubble[aria-pressed="true"]{border-color:var(--bubble); color:#ffd89a}
.btn.chip.insertion[aria-pressed="true"]{border-color:var(--insertion); color:#ffc0ce}
.btn.chip.quick[aria-pressed="true"]{border-color:var(--quick); color:#b9ecf1}
.btn.chip.merge[aria-pressed="true"]{border-color:var(--merge); color:#ddd0ff}

.foot{
  font-size:11.5px; line-height:1.6; color:#b2adcb;
  border-top:1px solid var(--line); padding-top:12px;
}
.link{
  color:var(--accent); cursor:pointer; font:inherit; font-weight:600; text-align:left;
  text-decoration:underline; text-underline-offset:2px;
}
.link:hover{color:#ab9cff}

/* ---------- about ---------- */
dialog{
  border:none; padding:0; background:transparent; max-width:min(706px, 92vw);
  max-height:86vh; margin:auto;
}
dialog::backdrop{background:rgba(5,5,10,.68); backdrop-filter:blur(3px)}
.about{
  position:relative; background:#111020; border:1px solid rgba(214,210,240,.2);
  border-radius:18px; padding:26px 28px 24px; overflow-y:auto; max-height:86vh;
  box-shadow:0 30px 60px -28px #000;
}
.about h2{
  font-family:var(--serif); font-weight:400; font-size:31px; line-height:1.05;
  margin:4px 0 14px; color:var(--text);
}
.about h3{
  font-family:var(--serif); font-weight:400; font-size:22px; line-height:1.1;
  margin:22px 0 10px; color:var(--text);
}
.about p{font-size:14.5px; line-height:1.68; color:var(--text-2); margin-bottom:12px}
.about p b{color:var(--text); font-weight:600}
.about em,.about i{font-style:italic}
.about .code{font:600 12.5px/1 var(--mono); color:var(--text-2)}
.about .fine{
  font-size:12.5px; color:var(--text-3); border-top:1px solid var(--line);
  padding-top:12px; margin-top:16px; margin-bottom:0;
}
.x{
  position:absolute; top:14px; right:14px; width:32px; height:32px; cursor:pointer;
  display:flex; align-items:center; justify-content:center; color:var(--text-3);
  background:var(--panel-2); border:1px solid var(--line); border-radius:999px;
}
.x:hover{color:var(--text); border-color:var(--line-2)}

/* ---------- narrow ---------- */
@media (max-width:920px){
  main{grid-template-columns:minmax(0,1fr); gap:16px; padding:8px 14px max(20px, env(safe-area-inset-bottom))}
  .panel{position:static}
  h1{font-size:clamp(28px, 8vw, 40px)}
  .sub{font-size:14px}
  .lane{height:clamp(52px, 17vw, 76px)}
  .about{padding:22px 20px 20px; border-radius:15px}
  .about h2{font-size:26px}
  .about h3{font-size:20px}
}
@media (max-width:420px){
  .lane .tag{font-size:10.5px}
  .lane .badge{font-size:10px}
}