:root{
  --glass:rgba(12,12,24,.34);
  --glass-2:rgba(12,12,24,.58);
  --glass-line:rgba(255,255,255,.16);
  --text:#fbf7f2;
  --text-2:rgba(251,247,242,.74);
  --accent:#f39a62;
  --sans:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;
  --serif:'Instrument Serif',Georgia,'Times New Roman',serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html,body{height:100%}
body{
  background:#1d2340; color:var(--text); font-family:var(--sans);
  overflow:hidden; -webkit-font-smoothing:antialiased; touch-action:none;
}
canvas{position:fixed; inset:0; width:100%; height:100%; display:block}
#flock{cursor:crosshair}
:focus-visible{outline:2px solid var(--accent); outline-offset:2px}

.ui{position:fixed; inset:0; pointer-events:none; transition:opacity .4s}
.ui.is-hidden{opacity:0}
.ui.is-hidden *{pointer-events:none !important}
.ui > *{pointer-events:auto}

/* ---------- top bar ---------- */
.bar{
  position:absolute; top:0; left:0; right:0;
  display:flex; justify-content:space-between; align-items:center; gap:12px;
  padding:max(16px, env(safe-area-inset-top)) 20px 0;
  pointer-events:none;
}
.bar > *{pointer-events:auto}
.home,.pill,.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(--glass); border:1px solid var(--glass-line); border-radius:999px;
  -webkit-backdrop-filter:blur(10px); backdrop-filter:blur(10px);
  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}
.pill{padding:0 15px 0 12px}
.icon{width:38px; justify-content:center; padding:0}
.home:hover,.pill:hover,.icon:hover{background:var(--glass-2); border-color:rgba(255,255,255,.3)}
.actions{display:flex; gap:8px}
.icon .i-on{display:none}
.icon[aria-pressed="true"] .i-on{display:block}
.icon[aria-pressed="true"] .i-off{display:none}
.icon[aria-pressed="true"],.icon[aria-expanded="true"]{background:rgba(243,154,98,.28); border-color:rgba(243,154,98,.6)}

/* ---------- title ---------- */
.title{
  position:absolute; left:0; bottom:0;
  padding:0 28px max(28px, env(safe-area-inset-bottom));
  max-width:620px; pointer-events:none;
  text-shadow:0 1px 18px rgba(0,0,0,.35);
}
.kicker{font-size:12px; font-weight:600; letter-spacing:.14em; text-transform:uppercase; color:var(--text-2)}
.title h1{
  font-family:var(--serif); font-weight:400; font-size:clamp(46px, 7.4vw, 92px);
  line-height:.95; letter-spacing:-.01em; margin:6px 0 10px;
}
.sub{font-size:15.5px; line-height:1.55; color:var(--text-2); max-width:470px}
.hint{
  margin-top:14px; display:inline-block; font-size:13.5px; font-weight:500;
  padding:7px 13px; border-radius:999px; background:var(--glass); border:1px solid var(--glass-line);
  -webkit-backdrop-filter:blur(8px); backdrop-filter:blur(8px);
  text-shadow:none; transition:opacity .8s;
}
.hint.is-gone{opacity:0}

/* ---------- controls panel ---------- */
.panel{
  position:absolute; top:70px; right:20px; width:300px; max-height:calc(100% - 90px); overflow:auto;
  padding:18px 18px 16px; border-radius:18px;
  background:rgba(14,14,26,.62); border:1px solid var(--glass-line);
  -webkit-backdrop-filter:blur(16px) saturate(1.2); backdrop-filter:blur(16px) saturate(1.2);
  box-shadow:0 20px 50px -20px rgba(0,0,0,.6);
}
.panel[hidden]{display:none}
.panel-head{display:flex; justify-content:space-between; align-items:center; margin-bottom:8px}
.panel h2{font-family:var(--serif); font-weight:400; font-size:24px}
.x{
  width:30px; height:30px; display:grid; place-items:center; border-radius:8px; cursor:pointer;
  background:transparent; border:0; color:var(--text-2);
}
.x:hover{background:rgba(255,255,255,.1); color:var(--text)}
.row{
  display:grid; grid-template-columns:1fr auto; align-items:center; row-gap:6px;
  padding:9px 0; font-size:13.5px; color:var(--text-2);
}
.row output{font-variant-numeric:tabular-nums; color:var(--text); font-weight:500}
.row input{grid-column:1 / -1}
input[type=range]{
  -webkit-appearance:none; appearance:none; width:100%; height:22px; background:transparent; cursor:pointer;
}
input[type=range]::-webkit-slider-runnable-track{height:4px; border-radius:4px; background:rgba(255,255,255,.18)}
input[type=range]::-moz-range-track{height:4px; border-radius:4px; background:rgba(255,255,255,.18)}
input[type=range]::-webkit-slider-thumb{
  -webkit-appearance:none; width:16px; height:16px; margin-top:-6px; border-radius:50%;
  background:var(--text); border:3px solid var(--accent);
}
input[type=range]::-moz-range-thumb{width:12px; height:12px; border-radius:50%; background:var(--text); border:3px solid var(--accent)}
.row-block{padding:10px 0 6px}
.lbl{display:block; font-size:13.5px; color:var(--text-2); margin-bottom:8px}
.seg{display:grid; grid-template-columns:repeat(3,1fr); gap:4px; padding:3px; border-radius:10px; background:rgba(255,255,255,.08)}
.seg button{
  height:30px; border:0; border-radius:8px; background:transparent; color:var(--text-2);
  font:500 13px var(--sans); cursor:pointer;
}
.seg button:hover{color:var(--text)}
.seg button.is-on{background:rgba(255,255,255,.9); color:#1a1a26}
.check{display:flex; align-items:center; gap:9px; padding:12px 0 4px; font-size:13.5px; color:var(--text-2); cursor:pointer}
.check input{accent-color:var(--accent); width:16px; height:16px}
.panel-foot{margin-top:12px; padding-top:12px; border-top:1px solid var(--glass-line)}
.link{background:none; border:0; color:var(--accent); font:500 13.5px var(--sans); cursor:pointer; padding:0}
.link:hover{text-decoration:underline}
.keys{margin-top:10px; font-size:12px; color:rgba(251,247,242,.55)}
kbd{font:500 11px var(--sans); padding:1px 5px; border-radius:4px; border:1px solid rgba(255,255,255,.25)}

/* ---------- about dialog ---------- */
dialog{
  margin:auto; width:min(560px, calc(100% - 32px)); max-height:calc(100% - 40px);
  border:0; border-radius:20px; padding:0; color:#1d1b24; background:#fbf7f2;
  box-shadow:0 30px 80px -20px rgba(0,0,0,.6);
}
dialog::backdrop{background:rgba(10,10,20,.5); -webkit-backdrop-filter:blur(3px); backdrop-filter:blur(3px)}
.about{position:relative; padding:30px 32px 28px}
.about .x{position:absolute; top:14px; right:14px; color:#6b6674}
.about .x:hover{background:#efe9df; color:#1d1b24}
.about .kicker{color:#b35d2b}
.about h2{font-family:var(--serif); font-weight:400; font-size:38px; line-height:1.05; margin:6px 0 14px}
.about p{font-size:15px; line-height:1.65; color:#403b48; margin-bottom:12px}
.about .fine{font-size:14px; color:#6b6674; margin:16px 0 0; padding-top:14px; border-top:1px solid #e6dfd3}

@media (max-width:640px){
  .pill span{display:none}
  .pill{width:38px; padding:0; justify-content:center}
  .title{padding:0 18px max(20px, env(safe-area-inset-bottom))}
  .sub{font-size:14px}
  .panel{left:12px; right:12px; width:auto; top:auto; bottom:12px; max-height:62%}
  .about{padding:26px 22px 22px}
}