/* ── EvoChem · bioluminescent dark ─────────────────────────────── */
:root{
  --bg:#05080c; --bg2:#080d14; --panel:rgba(18,28,38,.55);
  --ink:#dfeef0; --mut:#7e9aa2; --dim:#54707a;
  --bio:#39ffb0; --bio2:#00e0c0; --cyan:#36e0ff; --lethal:#ff7a8a; --gold:#ffd76a;
  --line:rgba(57,255,176,.14);
  --mono:'JetBrains Mono',ui-monospace,monospace; --sans:'Inter',system-ui,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--ink);font-family:var(--sans);line-height:1.6;
  overflow-x:hidden;-webkit-font-smoothing:antialiased}
body::before{content:'';position:fixed;inset:0;z-index:-2;
  background:radial-gradient(1200px 800px at 70% -10%,rgba(0,224,192,.10),transparent 60%),
             radial-gradient(900px 700px at 10% 110%,rgba(54,224,255,.07),transparent 60%),var(--bg)}
.grain{position:fixed;inset:0;z-index:-1;opacity:.035;pointer-events:none;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E")}
a{color:var(--bio2);text-decoration:none}
.wrap{max-width:1080px;margin:0 auto;padding:0 24px}
.mono{font-family:var(--mono)}
.glow{text-shadow:0 0 24px rgba(57,255,176,.45)}

/* nav */
nav{position:fixed;top:0;left:0;right:0;z-index:50;backdrop-filter:blur(12px);
  background:linear-gradient(180deg,rgba(5,8,12,.85),rgba(5,8,12,.2));border-bottom:1px solid var(--line)}
nav .wrap{display:flex;align-items:center;justify-content:space-between;height:58px}
nav .brand{font-family:var(--mono);font-weight:700;letter-spacing:.5px;color:var(--bio)}
nav .brand b{color:var(--ink)}
nav .links{display:flex;gap:22px;font-size:13px}
nav .links a{color:var(--mut)}nav .links a:hover{color:var(--bio)}
@media(max-width:720px){nav .links{display:none}}

/* hero */
#hero{position:relative;height:100vh;min-height:640px;display:flex;align-items:center;overflow:hidden}
#bg-canvas{position:absolute;inset:0;width:100%;height:100%}
#hero .wrap{position:relative;z-index:2}
.eyebrow{font-family:var(--mono);font-size:12.5px;letter-spacing:3px;color:var(--bio);text-transform:uppercase;margin-bottom:20px}
h1{font-size:clamp(34px,6vw,68px);line-height:1.05;font-weight:800;letter-spacing:-1px;max-width:14ch}
h1 .a{color:var(--bio)}h1 .b{color:var(--cyan)}
.sub{margin-top:22px;font-size:clamp(15px,2vw,19px);color:var(--mut);max-width:54ch}
.cta{margin-top:34px;display:flex;gap:14px;flex-wrap:wrap}
.btn{font-family:var(--mono);font-size:13px;padding:11px 20px;border-radius:8px;border:1px solid var(--bio);
  color:var(--bio);background:rgba(57,255,176,.05);cursor:pointer;transition:.2s}
.btn:hover{background:rgba(57,255,176,.14);box-shadow:0 0 26px rgba(57,255,176,.25)}
.btn.ghost{border-color:var(--line);color:var(--mut)}.btn.ghost:hover{color:var(--ink)}
.scrolldot{position:absolute;bottom:26px;left:50%;transform:translateX(-50%);z-index:2;color:var(--dim);font-family:var(--mono);font-size:11px;letter-spacing:2px;animation:bob 2s ease-in-out infinite}
@keyframes bob{50%{transform:translate(-50%,8px)}}

/* sections */
section{position:relative;padding:110px 0}
.kicker{font-family:var(--mono);font-size:12px;letter-spacing:2.5px;color:var(--bio2);text-transform:uppercase;margin-bottom:14px}
h2{font-size:clamp(26px,4vw,42px);font-weight:800;letter-spacing:-.5px;line-height:1.12;max-width:20ch}
.lead{margin-top:18px;font-size:17px;color:var(--mut);max-width:64ch}
.reveal{opacity:0;transform:translateY(26px);transition:.8s cubic-bezier(.2,.7,.2,1)}
.reveal.in{opacity:1;transform:none}

/* stats */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:46px}
@media(max-width:720px){.stats{grid-template-columns:repeat(2,1fr)}}
.stat{padding:22px;border:1px solid var(--line);border-radius:14px;background:var(--panel)}
.stat .num{font-family:var(--mono);font-size:clamp(24px,3.4vw,38px);font-weight:700;color:var(--bio)}
.stat .lab{font-size:12.5px;color:var(--dim);margin-top:6px;letter-spacing:.4px}

/* cards / panels */
.panel{border:1px solid var(--line);border-radius:16px;background:var(--panel);backdrop-filter:blur(8px)}
.chart{width:100%;height:560px}
.note{font-size:13.5px;color:var(--dim);margin-top:14px;font-family:var(--mono)}

/* convergence explorer */
.explorer{display:grid;grid-template-columns:230px 1fr;gap:0;margin-top:40px;border:1px solid var(--line);border-radius:16px;overflow:hidden;background:var(--panel)}
@media(max-width:720px){.explorer{grid-template-columns:1fr}}
.tlist{max-height:520px;overflow:auto;border-right:1px solid var(--line)}
.titem{padding:12px 16px;font-family:var(--mono);font-size:13px;color:var(--mut);cursor:pointer;border-bottom:1px solid rgba(255,255,255,.03);display:flex;justify-content:space-between;gap:8px}
.titem:hover{background:rgba(57,255,176,.06);color:var(--ink)}
.titem.on{background:rgba(57,255,176,.10);color:var(--bio);border-left:2px solid var(--bio)}
.titem .c{color:var(--dim);font-size:11px}
.tdetail{padding:26px}
.tdetail h3{font-size:22px;margin-bottom:4px}
.badge{display:inline-block;font-family:var(--mono);font-size:11px;padding:3px 9px;border-radius:20px;margin-left:8px}
.badge.s{color:var(--bio);background:rgba(57,255,176,.10);border:1px solid var(--line)}
.badge.l{color:var(--lethal);background:rgba(255,122,138,.08);border:1px solid rgba(255,122,138,.2)}
.chemo{margin-top:18px;display:flex;flex-direction:column;gap:8px}
.chemo .row{display:flex;align-items:center;gap:12px}
.chemo .bar{height:9px;border-radius:6px;background:linear-gradient(90deg,var(--bio2),var(--bio));box-shadow:0 0 12px rgba(57,255,176,.3)}
.chemo .nm{font-size:13px;color:var(--ink);min-width:200px}
.chemo .ex{font-size:12px;color:var(--dim);font-family:var(--mono)}

/* principle / pull */
.pull{margin-top:30px;padding:30px 34px;border-left:3px solid var(--bio);background:linear-gradient(90deg,rgba(57,255,176,.06),transparent);border-radius:0 14px 14px 0}
.pull b{color:var(--bio)}
.split{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:30px}
@media(max-width:720px){.split{grid-template-columns:1fr}}
.col{padding:24px;border:1px solid var(--line);border-radius:14px;background:var(--panel)}
.col.s{border-color:rgba(57,255,176,.25)}.col.l{border-color:rgba(255,122,138,.22)}
.col h4{font-family:var(--mono);font-size:13px;letter-spacing:1px;margin-bottom:8px}
.col.s h4{color:var(--bio)}.col.l h4{color:var(--lethal)}
.col p{font-size:14px;color:var(--mut)}
.col .ex{margin-top:12px;font-family:var(--mono);font-size:12px;color:var(--dim)}

/* case */
.case{display:grid;grid-template-columns:1fr auto 1fr;gap:18px;align-items:center;margin-top:36px}
@media(max-width:720px){.case{grid-template-columns:1fr}}
.mol{padding:24px;border:1px solid var(--line);border-radius:16px;background:var(--panel);text-align:center}
.mol .n{font-size:19px;font-weight:700}.mol .c{font-family:var(--mono);font-size:12px;color:var(--bio2);margin-top:4px}
.mol .p{font-size:12.5px;color:var(--dim);margin-top:8px}
.vs{text-align:center;font-family:var(--mono)}
.vs .arr{font-size:26px;color:var(--bio)}.vs .t{font-size:12px;color:var(--dim)}
.casebar{display:flex;gap:26px;justify-content:center;margin-top:26px;flex-wrap:wrap}
.casebar .k{text-align:center}.casebar .k .v{font-family:var(--mono);font-size:26px;font-weight:700}
.casebar .k .v.bad{color:var(--lethal)}.casebar .k .v.good{color:var(--bio)}
.casebar .k .l{font-size:11.5px;color:var(--dim)}

/* live demo */
.live{margin-top:36px;padding:30px;border:1px solid var(--line);border-radius:16px;background:var(--panel)}
.live .ctl{display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.live input,.live select{font-family:var(--mono);font-size:14px;padding:11px 14px;border-radius:9px;border:1px solid var(--line);background:#070c11;color:var(--ink);flex:1;min-width:220px}
.live .out{margin-top:22px;display:none}
.live .out.show{display:block}
.lcol{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:14px}
@media(max-width:720px){.lcol{grid-template-columns:1fr}}
.lbox{padding:16px;border:1px solid var(--line);border-radius:12px;background:#070c11}
.lbox h5{font-family:var(--mono);font-size:12px;color:var(--mut);letter-spacing:1px;margin-bottom:10px}
.nbr{display:flex;justify-content:space-between;font-size:13px;padding:5px 0;border-bottom:1px solid rgba(255,255,255,.03)}
.nbr .s{font-family:var(--mono);color:var(--bio)}
.verdict{margin-top:16px;padding:16px;border-radius:12px;font-size:14px;border:1px solid var(--line)}
.spin{display:inline-block;width:14px;height:14px;border:2px solid var(--line);border-top-color:var(--bio);border-radius:50%;animation:sp .8s linear infinite}
@keyframes sp{to{transform:rotate(360deg)}}

/* boundaries / footer */
.bounds{margin-top:30px;display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
@media(max-width:720px){.bounds{grid-template-columns:1fr}}
.bound{padding:20px;border:1px dashed rgba(255,215,106,.25);border-radius:12px;background:rgba(255,215,106,.03)}
.bound h4{font-family:var(--mono);font-size:12.5px;color:var(--gold);margin-bottom:8px}
.bound p{font-size:13.5px;color:var(--mut)}
footer{padding:60px 0 80px;border-top:1px solid var(--line);margin-top:90px;color:var(--dim)}
footer .wrap{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;font-size:13px}
footer .mono{color:var(--mut)}
.tag{font-family:var(--mono);font-size:11px;color:var(--dim);border:1px solid var(--line);border-radius:20px;padding:3px 10px;display:inline-block;margin:3px 4px 0 0}

/* ── language toggle ── */
.langbtn{font-family:var(--mono);font-size:12px;width:34px;height:28px;border-radius:7px;border:1px solid var(--bio);
  color:var(--bio);background:rgba(57,255,176,.06);cursor:pointer;transition:.2s}
.langbtn:hover{background:rgba(57,255,176,.16);box-shadow:0 0 16px rgba(57,255,176,.25)}
body.cn{font-family:'Noto Sans SC',var(--sans)}
body.cn h1,body.cn h2,body.cn .n{letter-spacing:0}
body.cn em,body.cn i{font-style:normal;color:var(--bio)}   /* Chinese: emphasise by colour, never italic */

/* ── full tree canvas ── */
.treebox{position:relative;width:100%;max-width:1180px;margin:40px auto 24px;padding:0 16px}
#tree-canvas{display:block;width:100%;height:660px;border:1px solid var(--line);border-radius:18px;
  background:radial-gradient(650px 500px at 50% 50%,rgba(0,224,192,.06),transparent 70%),#04070a;cursor:grab}
@media(max-width:720px){#tree-canvas{height:440px}}
.tree-legend{position:absolute;left:34px;top:22px;display:flex;flex-direction:column;gap:7px;font-family:var(--mono);font-size:12px;color:var(--mut);pointer-events:none}
.tree-legend .dot{display:inline-block;width:9px;height:9px;border-radius:2px;margin-right:8px;vertical-align:middle}
.tree-hint{position:absolute;display:none;pointer-events:none;background:#0a0e14;border:1px solid var(--bio);border-radius:8px;
  padding:8px 11px;font-size:12.5px;color:var(--ink);max-width:260px;box-shadow:0 6px 24px rgba(0,0,0,.5);z-index:5}
.tree-hint b{color:var(--bio)}
.tree-reset{position:absolute;right:34px;top:22px;font-family:var(--mono);font-size:11px;padding:6px 12px;border-radius:7px;
  border:1px solid var(--line);color:var(--mut);background:rgba(10,14,20,.7);cursor:pointer}
.tree-reset:hover{color:var(--bio);border-color:var(--bio)}
.tree-load{position:absolute;inset:16px;display:none;align-items:center;justify-content:center;gap:12px;
  font-family:var(--mono);font-size:14px;color:var(--mut);background:rgba(4,7,10,.6);border-radius:18px}

/* ── tree CTA (main page) ── */
.treecta{display:flex;align-items:center;gap:18px;justify-content:center;margin:44px auto 32px;max-width:660px;
  padding:26px 32px;border:1px solid var(--bio);border-radius:16px;background:linear-gradient(180deg,rgba(57,255,176,.07),rgba(57,255,176,.02));
  font-family:var(--mono);font-size:16px;color:var(--bio);cursor:pointer;transition:.25s}
.treecta:hover{background:rgba(57,255,176,.12);box-shadow:0 0 42px rgba(57,255,176,.25);transform:translateY(-2px)}
.tcta-ring{width:34px;height:34px;border-radius:50%;flex:none;
  background:radial-gradient(circle,rgba(57,255,176,.95) 1px,transparent 2px) 50%/7px 7px,
    conic-gradient(from 0deg,transparent,rgba(57,255,176,.6),transparent 62%);
  animation:tspin 6s linear infinite;box-shadow:0 0 16px rgba(57,255,176,.4)}
@keyframes tspin{to{transform:rotate(360deg)}}

/* keep language toggle visible on mobile */
@media(max-width:720px){nav .links{display:flex;gap:0}nav .links a{display:none}nav .links .langbtn{display:inline-block;margin-left:auto}}

/* ── tree detail drawer ── */
.detail{position:fixed;top:56px;right:0;width:min(440px,92vw);height:calc(100vh - 56px);z-index:18;
  background:linear-gradient(180deg,rgba(8,13,20,.97),rgba(5,9,14,.98));border-left:1px solid var(--bio);
  transform:translateX(100%);transition:transform .35s cubic-bezier(.2,.7,.2,1);overflow-y:auto;box-shadow:-20px 0 60px rgba(0,0,0,.5)}
.detail.open{transform:none}
.dclose{position:sticky;top:0;float:right;margin:12px;font-family:var(--mono);font-size:16px;color:var(--mut);cursor:pointer;z-index:2}
.dclose:hover{color:var(--bio)}
#detail-body{padding:22px 24px 60px}
.pload,.pdim{color:var(--dim);font-family:var(--mono);font-size:13px;padding:8px 0}
.dtitle{font-size:20px;font-weight:700;line-height:1.25}
.dtitle .cn{color:var(--bio);font-size:17px;margin-left:6px}
.dsub{font-family:var(--mono);font-size:12px;color:var(--dim);margin-top:4px}
.dsec{margin-top:22px}
.dsec>h4{font-family:var(--mono);font-size:12px;letter-spacing:1px;color:var(--bio2);text-transform:uppercase;margin-bottom:12px;border-bottom:1px solid var(--line);padding-bottom:6px}
.ecogrp{margin-bottom:10px;font-size:13px;line-height:1.9}
.ecoit{font-family:var(--mono);font-size:11px;color:var(--lethal);margin-right:8px;text-transform:uppercase}
.chip{display:inline-block;font-size:12px;padding:2px 9px;margin:2px 4px 2px 0;border-radius:20px;border:1px solid var(--line);color:var(--mut);background:rgba(255,255,255,.02)}
.molrow{display:flex;align-items:center;gap:12px;padding:10px;border:1px solid var(--line);border-radius:11px;margin-bottom:8px;cursor:pointer;transition:.18s;background:rgba(255,255,255,.015)}
.molrow:hover{border-color:var(--bio);background:rgba(57,255,176,.05)}
.molsvg{width:56px;height:44px;flex:none;background:rgba(0,224,192,.04);border-radius:7px}
.molmeta{flex:1;min-width:0}
.molnm{font-size:13.5px;color:var(--ink);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.molarrow{color:var(--dim);font-family:var(--mono)}
.grade{display:inline-block;font-family:var(--mono);font-size:10.5px;padding:2px 8px;border-radius:20px;margin-top:5px}
.grade.big{font-size:12px;margin:0 0 12px}
.grade.ga{color:#ffd76a;background:rgba(255,215,106,.10);border:1px solid rgba(255,215,106,.3)}
.grade.gt{color:var(--bio);background:rgba(57,255,176,.10);border:1px solid var(--line)}
.grade.ge{color:var(--cyan);background:rgba(54,224,255,.08);border:1px solid rgba(54,224,255,.25)}
.grade.gd{color:var(--dim);background:rgba(120,140,150,.06);border:1px solid rgba(120,140,150,.2)}
.molexp{padding:0 6px}
.molexp:not(:empty){padding:6px 10px 14px}
.molhead{display:flex;gap:14px;align-items:flex-start;margin:2px 0 12px}
.molbig{width:230px;max-width:50%;height:auto;flex:none;background:rgba(0,224,192,.04);border:1px solid var(--line);border-radius:11px}
.molinfo{flex:1;min-width:0}
.smiles{margin:11px 0 4px}
.smlab{display:block;font-family:var(--mono);font-size:10px;color:var(--dim);letter-spacing:.6px;margin-bottom:4px}
.smcode{display:block;font-family:var(--mono);font-size:11px;color:var(--bio2);word-break:break-all;line-height:1.55;background:rgba(255,255,255,.02);border:1px solid var(--line);border-radius:7px;padding:7px 9px;user-select:all;cursor:text}
.srclinks{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-top:10px}
.srcbtn{font-family:var(--mono);font-size:11px;padding:5px 10px;border-radius:7px;border:1px solid var(--line);color:var(--mut);text-decoration:none;white-space:nowrap}
.srcbtn:hover{color:var(--bio);border-color:var(--bio);background:rgba(57,255,176,.05)}
@media(max-width:560px){.molhead{flex-direction:column}.molbig{max-width:100%;width:100%}}
.erow{font-size:13px;color:var(--mut);margin:8px 0;line-height:1.6}
.erow b{color:var(--ink);font-weight:600}
.acts{margin-top:5px}
.act{font-family:var(--mono);font-size:11.5px;color:var(--dim);padding:3px 0;border-bottom:1px solid rgba(255,255,255,.03)}
.recbtns{display:flex;gap:10px;margin:14px 0 8px}
.recbtn{flex:1;font-family:var(--mono);font-size:12px;padding:9px;border-radius:8px;border:1px solid var(--bio);color:var(--bio);background:rgba(57,255,176,.05);cursor:pointer}
.recbtn.eco{border-color:var(--cyan);color:var(--cyan);background:rgba(54,224,255,.05)}
.recbtn:hover{box-shadow:0 0 18px rgba(57,255,176,.25)}
.recttl{font-family:var(--mono);font-size:11px;color:var(--dim);margin:8px 0 6px}
.recrow{display:flex;justify-content:space-between;gap:8px;font-size:12.5px;padding:6px 9px;border-radius:7px;cursor:pointer;border:1px solid transparent}
.recrow:hover{background:rgba(57,255,176,.07);border-color:var(--line)}
.recrow .s{font-family:var(--mono);color:var(--bio)}