:root{
  --bg:#EDF1EF; --panel:#FFFFFF; --panel2:#F6F8F7; --ink:#15201D; --muted:#56655F; --line:#CAD3CF; --line2:#DFE5E2;
  --accent:#0B6E5F; --accent-soft:#D5EAE5; --accent-ink:#FFFFFF;
  --ground:#E2E8E5; --grid:#D2DAD6;
  --energy:#C94E24; --water:#2B73C0; --material:#93711B; --bio:#3A8636; --gas:#7560B0;
  --good:#1E7A45; --warn:#A96A00; --bad:#B8322A;
  --good-soft:#DDF0E3; --warn-soft:#F7EACB; --bad-soft:#F6DCD9;
  --shadow:0 1px 2px rgba(20,40,34,.06),0 4px 14px rgba(20,40,34,.06);
  --display:"Archivo","Helvetica Neue",Arial,sans-serif;
  --body:"Public Sans","Segoe UI",system-ui,sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,Menlo,Consolas,monospace;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    color-scheme:dark;
    --bg:#0E1412; --panel:#161F1C; --panel2:#1B2622; --ink:#E3EBE8; --muted:#94A49F; --line:#2D3A36; --line2:#24302C;
    --accent:#43B9A3; --accent-soft:#16352F; --accent-ink:#06201A;
    --ground:#121A17; --grid:#1D2825;
    --energy:#EE7A4E; --water:#5DA3EE; --material:#D0AB4A; --bio:#6ABF5E; --gas:#A590E3;
    --good:#5CC689; --warn:#E3A93C; --bad:#F07267;
    --good-soft:#163424; --warn-soft:#3A2D12; --bad-soft:#3D1C19;
    --shadow:0 1px 2px rgba(0,0,0,.3),0 4px 14px rgba(0,0,0,.25);
  }
}
:root[data-theme="dark"]{
  color-scheme:dark;
  --bg:#0E1412; --panel:#161F1C; --panel2:#1B2622; --ink:#E3EBE8; --muted:#94A49F; --line:#2D3A36; --line2:#24302C;
  --accent:#43B9A3; --accent-soft:#16352F; --accent-ink:#06201A;
  --ground:#121A17; --grid:#1D2825;
  --energy:#EE7A4E; --water:#5DA3EE; --material:#D0AB4A; --bio:#6ABF5E; --gas:#A590E3;
  --good:#5CC689; --warn:#E3A93C; --bad:#F07267;
  --good-soft:#163424; --warn-soft:#3A2D12; --bad-soft:#3D1C19;
  --shadow:0 1px 2px rgba(0,0,0,.3),0 4px 14px rgba(0,0,0,.25);
}
*{box-sizing:border-box}
body{background:var(--bg);color:var(--ink);font-family:var(--body);font-size:14px;line-height:1.5;margin:0}
h1,h2,h3,h4{font-family:var(--display);text-wrap:balance;margin:0;line-height:1.15}
h2{font-size:22px;font-weight:700;font-stretch:110%}
h3{font-size:16px;font-weight:700;font-stretch:105%}
h4{font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);font-stretch:110%}
p{margin:0}
a{color:var(--accent)}
button,input,select,textarea{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.mono{font-family:var(--mono);font-variant-numeric:tabular-nums}
.num{font-variant-numeric:tabular-nums}
.wrap{max-width:1440px;margin:0 auto;padding-inline:16px}

/* header */
.top{position:sticky;top:env(safe-area-inset-top,0px);z-index:20;background:var(--panel);border-bottom:1px solid var(--line)}
.top .wrap{display:flex;align-items:center;gap:20px;flex-wrap:wrap;padding-block:10px}
.brand{display:flex;align-items:center;gap:10px;margin-right:auto}
.brand svg{flex:none}
.brand b{font-family:var(--display);font-weight:800;font-stretch:118%;font-size:18px;letter-spacing:-.01em}
.brand small{display:block;font-family:var(--mono);font-size:10.5px;color:var(--muted);letter-spacing:.04em}
.tabs{display:flex;gap:4px;flex-wrap:wrap}
.tabs button{border:1px solid transparent;background:none;padding:7px 12px;border-radius:6px;cursor:pointer;font-family:var(--display);font-weight:600;font-stretch:105%;font-size:13.5px;color:var(--muted)}
.tabs button:hover{color:var(--ink);background:var(--panel2)}
.tabs button[aria-selected="true"]{color:var(--accent-ink);background:var(--accent)}
main{padding-block:18px 48px}
.tab-intro{display:flex;justify-content:space-between;align-items:flex-end;gap:16px;flex-wrap:wrap;margin-bottom:14px}
.tab-intro p{color:var(--muted);max-width:70ch;margin-top:4px}

/* generic */
.panel{background:var(--panel);border:1px solid var(--line);border-radius:8px}
.btn{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line);background:var(--panel);padding:6px 11px;border-radius:6px;cursor:pointer;font-size:13px;font-weight:500;line-height:1.3}
.btn:hover{border-color:var(--accent);color:var(--accent)}
.btn.primary{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}
.btn.primary:hover{filter:brightness(1.08);color:var(--accent-ink)}
.btn.small{padding:3px 8px;font-size:12px}
.btn.danger:hover{border-color:var(--bad);color:var(--bad)}
.chip{display:inline-flex;align-items:center;gap:5px;font-size:11.5px;font-weight:600;padding:2px 8px;border-radius:99px;background:var(--panel2);border:1px solid var(--line2);white-space:nowrap}
.chip.good{background:var(--good-soft);color:var(--good);border-color:transparent}
.chip.warn{background:var(--warn-soft);color:var(--warn);border-color:transparent}
.chip.bad{background:var(--bad-soft);color:var(--bad);border-color:transparent}
.dot{width:9px;height:9px;border-radius:50%;display:inline-block;flex:none}
.c-energy{--c:var(--energy)} .c-water{--c:var(--water)} .c-material{--c:var(--material)} .c-bio{--c:var(--bio)} .c-gas{--c:var(--gas)}
.dot{background:var(--c,var(--muted))}
.field{display:flex;flex-direction:column;gap:3px;font-size:12px;color:var(--muted)}
.field input,.field select{padding:5px 7px;border:1px solid var(--line);border-radius:5px;background:var(--panel);color:var(--ink);font-size:13px}
table{border-collapse:collapse;width:100%}
th,td{text-align:left;padding:6px 8px;border-bottom:1px solid var(--line2);vertical-align:top}
th{font-size:11px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);font-weight:600}
td.r,th.r{text-align:right}
.scroll-x{overflow-x:auto}

/* ===== Builder ===== */
.builder{display:grid;grid-template-columns:230px minmax(0,1fr) 330px;gap:14px;align-items:start}
.palette,.inspector{padding:14px;display:flex;flex-direction:column;gap:14px}
.palette .grp{display:flex;flex-direction:column;gap:6px}
.fac-list{display:flex;flex-direction:column;gap:3px}
.fac-btn{display:flex;align-items:center;gap:8px;width:100%;text-align:left;border:1px solid transparent;background:none;padding:5px 6px;border-radius:5px;cursor:pointer;font-size:13px}
.fac-btn:hover{background:var(--panel2);border-color:var(--line2)}
.fac-btn .code{font-family:var(--mono);font-size:10.5px;font-weight:600;background:var(--panel2);border:1px solid var(--line);border-radius:3px;padding:0 4px;min-width:34px;text-align:center;color:var(--muted)}
.fac-btn .plus{margin-left:auto;color:var(--muted);font-weight:600}
.stage{display:flex;flex-direction:column;gap:12px;min-width:0}
.kpis{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:8px}
.kpi{background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:9px 11px}
.kpi .l{font-size:10.5px;text-transform:uppercase;letter-spacing:.07em;color:var(--muted);font-weight:600}
.kpi .v{font-family:var(--display);font-weight:700;font-stretch:108%;font-size:20px;font-variant-numeric:tabular-nums;line-height:1.2;margin-top:2px}
.kpi .s{font-size:11px;color:var(--muted)}
.site{position:relative;background:var(--panel);border:1px solid var(--line);border-radius:8px;overflow:hidden}
.site-bar{display:flex;align-items:center;gap:10px;flex-wrap:wrap;padding:8px 12px;border-bottom:1px solid var(--line2);font-size:12px;color:var(--muted)}
.site-bar .legend{display:flex;gap:12px;flex-wrap:wrap;margin-left:auto}
.site-bar .legend span{display:inline-flex;align-items:center;gap:5px}
.svgwrap{overflow-x:auto}
#park{display:block;width:100%;height:auto;touch-action:pan-x pan-y;user-select:none;-webkit-user-select:none}
#park .node,#park [data-link]{touch-action:none}
#park .node{cursor:grab}
#park .node.dragging{cursor:grabbing}
#park .node rect.box{fill:var(--panel);stroke:var(--line);stroke-width:1.2}
#park .node.sel rect.box{stroke:var(--accent);stroke-width:2.4}
#park .node.dim{opacity:.35}
#park .node text{font-family:var(--body);fill:var(--ink)}
#park .node .code{font-family:var(--mono);font-size:10px;font-weight:600;fill:var(--muted)}
#park .node .nm{font-size:12.5px;font-weight:600}
#park .node .badge{fill:var(--accent-soft)}
#park .link{fill:none;stroke-linecap:round;cursor:pointer}
#park .link-hit{fill:none;stroke:transparent;stroke-width:14;cursor:pointer}
#park .link.flow{stroke-dasharray:6 7;animation:flow 1.1s linear infinite}
#park .link.bad{stroke-dasharray:2 5}
#park .link.sel{filter:drop-shadow(0 0 3px var(--accent))}
#park .link.dim{opacity:.18}
@keyframes flow{to{stroke-dashoffset:-13}}
@media (prefers-reduced-motion: reduce){#park .link.flow{animation:none}}
.site-foot{display:flex;gap:10px;flex-wrap:wrap;align-items:center;justify-content:space-between;padding:8px 12px;border-top:1px solid var(--line2);font-size:12px;color:var(--muted)}
.insp-head{display:flex;justify-content:space-between;gap:8px;align-items:flex-start}
.insp-head input{font-family:var(--display);font-weight:700;font-size:16px;border:1px solid transparent;background:none;padding:2px 4px;margin-left:-4px;border-radius:4px;width:100%}
.insp-head input:hover,.insp-head input:focus{border-color:var(--line)}
.insp p.desc{color:var(--muted);font-size:12.5px}
.mini td,.mini th{padding:4px 4px;font-size:12px}
.bar{height:5px;background:var(--line2);border-radius:3px;overflow:hidden;margin-top:3px}
.bar i{display:block;height:100%;background:var(--c,var(--accent))}
.opps{display:flex;flex-direction:column;gap:6px}
.opp{border:1px solid var(--line2);border-radius:6px;padding:7px 9px;display:grid;grid-template-columns:1fr auto;gap:2px 8px;align-items:center;background:var(--panel2)}
.opp .t{font-size:12.5px;font-weight:600;display:flex;align-items:center;gap:6px}
.opp .m{font-size:11.5px;color:var(--muted);grid-column:1}
.opp .btn{grid-row:1/3;grid-column:2}
.test{display:flex;flex-direction:column;gap:6px;padding:10px;border-radius:6px;background:var(--panel2);border:1px solid var(--line2)}
.test .row{display:flex;justify-content:space-between;gap:8px;font-size:12.5px}
.kv{display:grid;grid-template-columns:auto 1fr;gap:4px 12px;font-size:12.5px}
.kv dt{color:var(--muted)} .kv dd{margin:0;text-align:right;font-variant-numeric:tabular-nums}
.note{font-size:12px;color:var(--muted)}
.callout{font-size:12.5px;padding:8px 10px;border-radius:6px;border:1px solid var(--line2);background:var(--panel2)}
.callout.warn{background:var(--warn-soft);border-color:transparent;color:var(--ink)}
.callout.bad{background:var(--bad-soft);border-color:transparent;color:var(--ink)}
details.assump{margin-top:14px}
details.assump>summary{cursor:pointer;padding:12px 14px;font-family:var(--display);font-weight:700;font-stretch:105%;list-style:none;display:flex;align-items:center;gap:10px}
details.assump>summary::before{content:"+";font-family:var(--mono);width:18px;height:18px;display:inline-grid;place-items:center;border:1px solid var(--line);border-radius:4px;font-size:13px}
details.assump[open]>summary::before{content:"−"}
details.assump>summary span{font-family:var(--body);font-weight:400;font-size:12.5px;color:var(--muted)}
.assump-body{padding:0 14px 14px;display:flex;flex-direction:column;gap:14px}
.globals{display:flex;gap:12px;flex-wrap:wrap}
.globals .field{width:170px}
.assump table input{width:84px;padding:3px 5px;border:1px solid var(--line);border-radius:4px;background:var(--panel);text-align:right;font-family:var(--mono);font-size:12px}
.io-row{display:flex;gap:8px;flex-wrap:wrap}
textarea#jsonBox{width:100%;min-height:90px;font-family:var(--mono);font-size:11.5px;padding:8px;border:1px solid var(--line);border-radius:6px;background:var(--panel2)}
.toast{position:fixed;left:50%;bottom:calc(20px + env(safe-area-inset-bottom,0px));transform:translateX(-50%);background:var(--ink);color:var(--bg);padding:8px 14px;border-radius:6px;font-size:13px;z-index:50;opacity:0;transition:opacity .2s;pointer-events:none}
.toast.on{opacity:1}

/* ===== Matchmaker ===== */
.mm{display:grid;grid-template-columns:320px minmax(0,1fr);gap:14px;align-items:start}
.mm-side{padding:12px;display:flex;flex-direction:column;gap:10px}
.seg{display:inline-flex;border:1px solid var(--line);border-radius:6px;overflow:hidden}
.seg button{border:0;background:var(--panel);padding:6px 10px;cursor:pointer;font-size:12.5px;font-weight:600}
.seg button[aria-pressed="true"]{background:var(--accent);color:var(--accent-ink)}
#mmSearch{width:100%;padding:7px 9px;border:1px solid var(--line);border-radius:6px;background:var(--panel)}
.cat-chips{display:flex;gap:5px;flex-wrap:wrap}
.cat-chips button{cursor:pointer}
.cat-chips button[aria-pressed="true"]{background:var(--ink);color:var(--bg);border-color:var(--ink)}
.mm-list{display:flex;flex-direction:column;gap:2px;max-height:560px;overflow:auto;margin-inline:-4px;padding-inline:4px}
.mm-item{display:flex;align-items:center;gap:8px;border:1px solid transparent;background:none;padding:7px 8px;border-radius:5px;cursor:pointer;text-align:left;width:100%}
.mm-item:hover{background:var(--panel2)}
.mm-item[aria-current="true"]{background:var(--accent-soft);border-color:var(--accent)}
.mm-item .n{font-weight:600;font-size:13px}
.mm-item .c{margin-left:auto;font-family:var(--mono);font-size:11px;color:var(--muted)}
.mm-detail{padding:18px;display:flex;flex-direction:column;gap:16px}
.mm-detail .src{color:var(--muted)}
.route{display:grid;grid-template-columns:minmax(0,1fr) 110px;gap:4px 14px;padding:12px;border:1px solid var(--line2);border-radius:7px}
.route h3{font-size:15px}
.route .who{font-size:12.5px;color:var(--muted)}
.route .req{font-size:12.5px;grid-column:1/-1}
.trl{grid-row:1/3;grid-column:2;justify-self:end}
.routes{display:flex;flex-direction:column;gap:8px}
.cols2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
ul.plain{margin:0;padding-left:18px}
ul.plain li{margin:2px 0}

/* ===== Cases ===== */
.cases{display:grid;grid-template-columns:260px minmax(0,1fr);gap:14px;align-items:start}
.case-list{padding:8px;display:flex;flex-direction:column;gap:2px}
.case-btn{border:1px solid transparent;background:none;text-align:left;padding:9px 10px;border-radius:6px;cursor:pointer;display:flex;flex-direction:column;gap:1px}
.case-btn:hover{background:var(--panel2)}
.case-btn[aria-current="true"]{background:var(--accent-soft);border-color:var(--accent)}
.case-btn b{font-family:var(--display);font-stretch:105%;font-size:14px}
.case-btn span{font-size:12px;color:var(--muted)}
.case-detail{padding:18px;display:flex;flex-direction:column;gap:16px}
.case-head{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;align-items:flex-start}
.case-head .loc{font-family:var(--mono);font-size:11.5px;color:var(--muted);letter-spacing:.03em}
.facts{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:8px}
.fact{border:1px solid var(--line2);border-radius:7px;padding:9px 11px;background:var(--panel2)}
.fact .v{font-family:var(--display);font-weight:700;font-stretch:108%;font-size:19px;font-variant-numeric:tabular-nums}
.fact .l{font-size:11.5px;color:var(--muted)}
.diagram{border:1px solid var(--line2);border-radius:7px;background:var(--ground);overflow-x:auto}
.diagram svg{display:block;min-width:620px;width:100%;height:auto}
.diagram text{font-family:var(--body);fill:var(--ink)}
.cmp td{font-size:12.5px}

/* ===== Learn ===== */
.learn{display:grid;grid-template-columns:minmax(0,1fr) 400px;gap:14px;align-items:start}
.lesson{padding:20px;display:flex;flex-direction:column;gap:18px}
.lesson section{display:flex;flex-direction:column;gap:8px}
.lesson p,.lesson li{max-width:72ch}
.types{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:6px}
.type{border:1px solid var(--line2);border-radius:6px;padding:8px;background:var(--panel2);font-size:12px}
.type b{display:block;font-family:var(--mono);font-size:11px;color:var(--accent)}
.stages{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}
.stage-card{border-top:3px solid var(--accent);padding:8px 2px 0;font-size:12.5px}
.stage-card b{font-family:var(--display);font-size:14px;display:block}
.barriers{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}
.barriers div{border:1px solid var(--line2);border-radius:6px;padding:8px 10px;font-size:12.5px}
.barriers b{display:block;font-size:13px}
blockquote{margin:0;padding:10px 14px;border-left:3px solid var(--accent);background:var(--panel2);font-style:italic;border-radius:0 6px 6px 0}
.quiz{padding:16px;display:flex;flex-direction:column;gap:12px;position:sticky;top:calc(70px + env(safe-area-inset-top,0px))}
.qprog{display:flex;gap:3px}
.qprog i{flex:1;height:5px;border-radius:2px;background:var(--line2)}
.qprog i.ok{background:var(--good)} .qprog i.no{background:var(--bad)} .qprog i.cur{background:var(--accent)}
.qopts{display:flex;flex-direction:column;gap:6px}
.qopt{text-align:left;border:1px solid var(--line);background:var(--panel);border-radius:6px;padding:8px 10px;cursor:pointer;font-size:13px}
.qopt:hover:not(:disabled){border-color:var(--accent)}
.qopt.ok{background:var(--good-soft);border-color:var(--good)}
.qopt.no{background:var(--bad-soft);border-color:var(--bad)}
.qopt:disabled{cursor:default}
.qexp{font-size:12.5px;padding:8px 10px;border-radius:6px;background:var(--panel2);border:1px solid var(--line2)}
.refs{font-size:12px;color:var(--muted)}
.refs li{margin:3px 0}

@media (max-width:1180px){
  .builder{grid-template-columns:210px minmax(0,1fr)}
  .inspector{grid-column:1/-1;display:grid;grid-template-columns:1fr 1fr;align-items:start}
  .kpis{grid-template-columns:repeat(3,minmax(0,1fr))}
  .learn{grid-template-columns:1fr}
  .quiz{position:static}
}
@media (max-width:820px){
  .builder,.mm,.cases{grid-template-columns:1fr}
  .stage{order:-1}
  #park{min-width:720px}
  .inspector{display:flex}
  .palette .fac-list{display:grid;grid-template-columns:1fr 1fr}
  .types{grid-template-columns:1fr 1fr}
  .stages,.cols2,.barriers{grid-template-columns:1fr}
  .mm-list{max-height:300px}
  .case-list{flex-direction:row;overflow-x:auto}
  .case-btn{min-width:170px}
}
@media (max-width:480px){
  .kpis{grid-template-columns:1fr 1fr}
  .palette .fac-list{grid-template-columns:1fr}
  .brand small{display:none}
  .top{position:static}
}

/* ===== v2 additions ===== */
.cases>*,.mm>*,.builder>*,.src-grid>*,.learn>*{min-width:0}
.mm-item .c{white-space:nowrap;align-self:flex-start;padding-top:2px}
.cite{font-size:.72em;vertical-align:super;line-height:0;white-space:nowrap;font-family:var(--mono);font-weight:500}
.cite a{color:var(--accent);text-decoration:none;cursor:pointer;padding:0 1px}
.cite a:hover{text-decoration:underline}
.pop{position:fixed;z-index:60;max-width:min(440px,calc(100vw - 32px));background:var(--panel);border:1px solid var(--line);border-radius:8px;box-shadow:var(--shadow);padding:12px 14px;font-size:12.5px;line-height:1.45}
.pop .n{font-family:var(--mono);color:var(--muted);font-size:11px}
.pop .acts{display:flex;gap:8px;margin-top:8px;flex-wrap:wrap}
.src-chip{font-family:var(--mono);font-size:10.5px;padding:1px 6px;border-radius:3px;border:1px solid var(--line);color:var(--muted);white-space:nowrap}
.src-chip.ok{border-color:transparent;background:var(--good-soft);color:var(--good)}
.src-chip.ill{border-color:transparent;background:var(--warn-soft);color:var(--warn)}
.filters{display:flex;flex-direction:column;gap:10px}
.filters .field select{width:100%}
.fgrid{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.count{font-size:12px;color:var(--muted)}
.meta-row{display:flex;gap:6px;flex-wrap:wrap;align-items:center}
.ewc{font-family:var(--mono);font-size:11.5px;padding:1px 6px;border-radius:3px;background:var(--panel2);border:1px solid var(--line2)}
.route.hl{border-color:var(--accent);background:var(--accent-soft)}
.route .ex{font-size:12.5px;grid-column:1/-1}
.route .rt{grid-column:1/-1;display:flex;gap:4px;flex-wrap:wrap}
.tag{font-size:10.5px;padding:1px 6px;border-radius:99px;background:var(--panel2);border:1px solid var(--line2);color:var(--muted)}
ul.cited{margin:0;padding-left:18px} ul.cited li{margin:3px 0}
.xtable td,.xtable th{font-size:12.5px}
.xtable .num-badge{display:inline-grid;place-items:center;width:20px;height:20px;border-radius:50%;font:600 10.5px var(--mono);color:#fff}
.status-hist{color:var(--muted);font-style:italic}
.case-filter{display:flex;gap:8px;flex-wrap:wrap;padding:8px}
.case-filter select{padding:5px 7px;border:1px solid var(--line);border-radius:5px;background:var(--panel);font-size:12.5px;width:100%}
.case-list{max-height:760px;overflow:auto}
.bib{display:flex;flex-direction:column;gap:0}
.bib li{padding:7px 0;border-bottom:1px solid var(--line2);font-size:13px;list-style:none;display:grid;grid-template-columns:44px 1fr;gap:8px}
.bib li .no{font-family:var(--mono);color:var(--muted);font-size:12px;text-align:right}
.bib li.flash{background:var(--accent-soft)}
.bib ol{margin:0;padding:0}
.repo-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:10px}
.repo{border:1px solid var(--line2);border-radius:7px;padding:10px 12px;display:flex;flex-direction:column;gap:4px;background:var(--panel2)}
.repo b{font-family:var(--display);font-size:13.5px}
.repo .org{font-size:11.5px;color:var(--muted)}
.repo p{font-size:12.5px}
.src-grid{display:grid;grid-template-columns:minmax(0,1fr) 380px;gap:14px;align-items:start}
.src-side{display:flex;flex-direction:column;gap:14px}
.prose p,.prose li{max-width:72ch}
.prose{display:flex;flex-direction:column;gap:8px;font-size:13.5px}
@media (max-width:1180px){.src-grid{grid-template-columns:1fr}}
@media (max-width:820px){.case-list{max-height:none}.fgrid{grid-template-columns:1fr}}


/* ===== v3: site shell & navigation ===== */
html{scroll-padding-top:120px;-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion: no-preference){html{scroll-behavior:smooth}}
[hidden]{display:none!important}
img{max-width:100%}
body{min-height:100vh;display:flex;flex-direction:column}
main{flex:1 0 auto;width:100%}
.skip{position:absolute;left:16px;top:-60px;z-index:100;background:var(--accent);color:var(--accent-ink);padding:8px 12px;border-radius:6px;text-decoration:none;font-weight:600}
.skip:focus{top:12px}
.ico{width:18px;height:18px;flex:none;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
kbd{font-family:var(--mono);font-size:11px;padding:1px 5px;border:1px solid var(--line);border-bottom-width:2px;border-radius:4px;background:var(--panel2);color:var(--muted);line-height:1.4}
mark{background:color-mix(in srgb,var(--warn) 28%,transparent);color:inherit;border-radius:2px;padding:0 1px}

.top{transition:box-shadow .2s}
.top.scrolled{box-shadow:var(--shadow)}
.top .wrap{gap:14px}
.hdr-tools{display:flex;align-items:center;gap:6px}
.icon-btn{position:relative;display:inline-grid;place-items:center;width:36px;height:36px;border-radius:8px;border:1px solid transparent;background:none;cursor:pointer;color:var(--muted)}
.icon-btn:hover{background:var(--panel2);color:var(--ink);border-color:var(--line2)}
.icon-btn .badge-n{position:absolute;top:2px;right:2px;min-width:16px;height:16px;padding:0 4px;border-radius:99px;background:var(--accent);color:var(--accent-ink);font:600 10px/16px var(--mono);text-align:center}
.search-btn{display:flex;align-items:center;gap:8px;min-width:210px;padding:7px 10px;border:1px solid var(--line);border-radius:8px;background:var(--panel2);color:var(--muted);cursor:pointer;font-size:13px}
.search-btn:hover{border-color:var(--accent);color:var(--ink)}
.search-btn kbd{margin-left:auto}
.progress{position:absolute;left:0;bottom:-1px;height:2px;background:var(--accent);width:0;transition:width .1s linear}
.tabs button{display:inline-flex;align-items:center;gap:6px}
.tabs .ico{width:16px;height:16px}

/* bottom navigation (phones) */
.bnav{display:none}
@media (max-width:820px){
  .top .tabs{display:none}
  .search-btn{min-width:0;width:36px;height:36px;padding:0;justify-content:center;border-color:transparent;background:none}
  .search-btn span,.search-btn kbd{display:none}
  .bnav{display:grid;grid-template-columns:repeat(5,1fr);position:fixed;left:0;right:0;bottom:0;z-index:30;background:var(--panel);border-top:1px solid var(--line);padding:4px 4px calc(4px + env(safe-area-inset-bottom,0px))}
  .bnav button{display:flex;flex-direction:column;align-items:center;gap:2px;border:0;background:none;padding:6px 2px;border-radius:8px;color:var(--muted);font:600 10.5px var(--display);cursor:pointer}
  .bnav button[aria-current="page"]{color:var(--accent);background:var(--accent-soft)}
  .bnav .ico{width:20px;height:20px}
  body{padding-bottom:calc(64px + env(safe-area-inset-bottom,0px))}
  .toast{bottom:calc(76px + env(safe-area-inset-bottom,0px))}
}

/* breadcrumbs & detail toolbars */
.crumbs{display:flex;align-items:center;gap:6px;flex-wrap:wrap;font-size:12px;color:var(--muted)}
.crumbs a{color:var(--muted);text-decoration:none;cursor:pointer}
.crumbs a:hover{color:var(--accent);text-decoration:underline}
.crumbs .sep{opacity:.6}
.dtools{display:flex;align-items:center;gap:6px;flex-wrap:wrap;justify-content:space-between}
.dtools .grp{display:flex;gap:6px;align-items:center;flex-wrap:wrap}
.btn .ico{width:15px;height:15px}
.btn[aria-pressed="true"]{background:var(--accent-soft);border-color:var(--accent);color:var(--accent)}
.btn[aria-pressed="true"] .ico{fill:currentColor}
.pager{display:flex;justify-content:space-between;gap:10px;border-top:1px solid var(--line2);padding-top:12px;flex-wrap:wrap}
.pager button{max-width:48%;text-align:left}
.pager button:last-child{text-align:right;margin-left:auto}
.pager small{display:block;color:var(--muted);font-size:11px}
.active-filters{display:flex;gap:5px;flex-wrap:wrap}
.active-filters button{cursor:pointer}
.sort-row{display:flex;justify-content:space-between;align-items:center;gap:8px}
.sort-row select{padding:4px 6px;border:1px solid var(--line);border-radius:5px;background:var(--panel);font-size:12px}
.mm-item:focus-visible,.case-btn:focus-visible{outline:2px solid var(--accent);outline-offset:-2px}
.mm-item .star{color:var(--warn);font-size:12px}
.welcome{display:flex;gap:12px;align-items:center;flex-wrap:wrap;padding:10px 14px;margin-bottom:14px;border:1px solid var(--accent);background:var(--accent-soft);border-radius:8px;font-size:13.5px}
.welcome .grow{flex:1 1 280px}

/* builder canvas controls */
.site{position:relative}
.canvas-tools{position:absolute;right:10px;top:48px;z-index:2;display:flex;flex-direction:column;gap:4px;background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:4px;box-shadow:var(--shadow)}
.canvas-tools .icon-btn{width:32px;height:32px}
.canvas-tools hr{border:0;border-top:1px solid var(--line2);margin:2px 0}
.canvas-tools .icon-btn:disabled{opacity:.35;cursor:default}
#park.panning{cursor:grabbing}
.zoom-note{font-family:var(--mono)}

/* case diagram interactivity */
.diagram .dnode{cursor:pointer}
.diagram .dnode:hover rect,.diagram .dnode.on rect{stroke:var(--accent);stroke-width:2.2}
.diagram.focus .dl{opacity:.12}
.diagram.focus .dl.on{opacity:1}
.diagram.focus .dnode:not(.on){opacity:.45}
.xtable tr.on td{background:var(--accent-soft)}
.xtable tr{cursor:default}

/* learn */
.toc{position:sticky;top:calc(64px + env(safe-area-inset-top,0px));z-index:5;display:flex;gap:6px;overflow-x:auto;padding:8px 0;margin:-8px 0 0;background:var(--panel);border-bottom:1px solid var(--line2);scrollbar-width:thin}
.toc a{flex:none;font-size:12px;font-weight:600;padding:4px 10px;border-radius:99px;border:1px solid var(--line2);color:var(--muted);text-decoration:none;cursor:pointer;white-space:nowrap}
.toc a.on{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}
.lesson section{scroll-margin-top:166px}
.lesson h3 .anchor{opacity:0;margin-left:6px;color:var(--muted);text-decoration:none;font-size:13px;cursor:pointer}
.lesson h3:hover .anchor{opacity:1}

/* sources */
.bib-tools{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.bib-tools select{padding:5px 7px;border:1px solid var(--line);border-radius:6px;background:var(--panel);font-size:12.5px}
.bib li>div{min-width:0;overflow-wrap:anywhere}
.bib li .used{display:flex;gap:4px;flex-wrap:wrap;margin-top:4px}
.bib li .used a{font-size:11px;padding:1px 7px;border-radius:99px;background:var(--panel2);border:1px solid var(--line2);color:var(--muted);text-decoration:none;cursor:pointer}
.bib li .used a:hover{border-color:var(--accent);color:var(--accent)}
.bib li .row-acts{display:flex;gap:6px;margin-top:4px}
.bib li .row-acts button{font-size:11px;border:0;background:none;color:var(--accent);cursor:pointer;padding:0}

/* dialogs: palette, help, drawer, tour */
.scrim{position:fixed;inset:0;z-index:70;background:rgba(10,20,17,.45);backdrop-filter:blur(2px);-webkit-backdrop-filter:blur(2px)}
.palette-dlg{position:fixed;z-index:71;left:50%;top:max(10vh,calc(16px + env(safe-area-inset-top,0px)));transform:translateX(-50%);width:min(640px,calc(100vw - 32px));max-height:min(70vh,560px);display:flex;flex-direction:column;background:var(--panel);border:1px solid var(--line);border-radius:12px;box-shadow:0 20px 60px rgba(0,0,0,.3);overflow:hidden}
.palette-dlg .pin{display:flex;align-items:center;gap:10px;padding:12px 14px;border-bottom:1px solid var(--line2)}
.palette-dlg input{flex:1;border:0;background:none;font-size:16px;outline:none;min-width:0}
.presults{overflow:auto;padding:6px}
.pgroup{font:700 10.5px var(--display);text-transform:uppercase;letter-spacing:.08em;color:var(--muted);padding:8px 10px 4px}
.pitem{display:flex;align-items:center;gap:10px;width:100%;text-align:left;border:0;background:none;padding:8px 10px;border-radius:7px;cursor:pointer;font-size:13.5px}
.pitem .sub{margin-left:auto;font-size:11.5px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:45%}
.pitem[aria-selected="true"]{background:var(--accent-soft)}
.pitem .ico{color:var(--muted)}
.pfoot{display:flex;gap:14px;flex-wrap:wrap;padding:8px 14px;border-top:1px solid var(--line2);font-size:11.5px;color:var(--muted)}
.help-dlg{position:fixed;z-index:71;left:50%;top:50%;transform:translate(-50%,-50%);width:min(620px,calc(100vw - 32px));max-height:calc(100vh - 48px);overflow:auto;background:var(--panel);border:1px solid var(--line);border-radius:12px;box-shadow:0 20px 60px rgba(0,0,0,.3);padding:18px 20px}
.help-dlg table td{padding:5px 6px;font-size:13px}
.help-dlg table td:first-child{white-space:nowrap}
.drawer{position:fixed;z-index:71;top:0;right:0;bottom:0;width:min(400px,100vw);background:var(--panel);border-left:1px solid var(--line);box-shadow:-10px 0 40px rgba(0,0,0,.2);display:flex;flex-direction:column;padding:calc(14px + env(safe-area-inset-top,0px)) 16px calc(14px + env(safe-area-inset-bottom,0px));gap:12px;overflow:auto}
@media (prefers-reduced-motion: no-preference){.drawer{animation:slidein .22s ease-out}.palette-dlg,.help-dlg{animation:fadein .15s ease-out}}
@keyframes slidein{from{transform:translateX(30px);opacity:0}}
@keyframes fadein{from{opacity:0}}
.dlist{display:flex;flex-direction:column;gap:2px}
.dlist button{display:flex;gap:8px;align-items:center;text-align:left;border:0;background:none;padding:7px 8px;border-radius:6px;cursor:pointer;font-size:13px;width:100%}
.dlist button:hover{background:var(--panel2)}
.dlist .k{margin-left:auto;font-size:11px;color:var(--muted)}
.tour-hole{position:fixed;z-index:80;border-radius:10px;box-shadow:0 0 0 9999px rgba(10,20,17,.55);pointer-events:none;transition:all .25s ease}
.tour-card{position:fixed;z-index:81;width:min(340px,calc(100vw - 32px));background:var(--panel);border:1px solid var(--line);border-radius:10px;box-shadow:0 12px 40px rgba(0,0,0,.3);padding:14px 16px;display:flex;flex-direction:column;gap:8px;font-size:13.5px}
.tour-card .acts{display:flex;justify-content:space-between;align-items:center;gap:8px}
.tour-card .step{font-family:var(--mono);font-size:11px;color:var(--muted)}

/* footer */
.foot{border-top:1px solid var(--line);background:var(--panel);margin-top:24px}
.foot .wrap{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:20px;padding-block:22px;font-size:12.5px;color:var(--muted)}
.foot h4{margin-bottom:6px}
.foot a{color:var(--muted)}
.foot .citebox{font-size:12px;padding:8px 10px;border-radius:6px;background:var(--panel2);border:1px solid var(--line2);color:var(--ink)}
@media (max-width:820px){.foot .wrap{grid-template-columns:1fr}}
.backtop{position:fixed;right:16px;bottom:calc(20px + env(safe-area-inset-bottom,0px));z-index:25;width:40px;height:40px;border-radius:50%;border:1px solid var(--line);background:var(--panel);box-shadow:var(--shadow);display:grid;place-items:center;cursor:pointer;color:var(--ink)}
@media (max-width:820px){.backtop{bottom:calc(76px + env(safe-area-inset-bottom,0px))}}
.toast{display:flex;gap:12px;align-items:center;pointer-events:none}
.toast.on{pointer-events:auto}
.toast button{border:0;background:none;color:var(--accent);font-weight:700;cursor:pointer;padding:0;font-size:13px}
:root[data-theme="dark"] .toast button{color:#7FE0CC}
.toast{background:var(--ink);color:var(--bg)}

/* view transitions */
::view-transition-old(root),::view-transition-new(root){animation-duration:.18s}

/* print */
@media print{
  .top,.bnav,.foot,.backtop,.toast,.palette,.inspector,.canvas-tools,.mm-side,.case-list,.quiz,.toc,.welcome,.dtools,.pager,details.assump{display:none!important}
  body{background:#fff;color:#000}
  .mm,.cases,.learn,.builder,.src-grid{display:block}
  .panel{border:0}
  a[href^="http"]::after{content:" (" attr(href) ")";font-size:10px;color:#555}
}

[tabindex="-1"]:focus{outline:none}
@media (max-width:480px){
  .top .wrap{flex-wrap:nowrap;gap:8px}
  .brand b{font-size:16px}
  #helpBtn{display:none}
  .hdr-tools{gap:2px}
}

/* site bar: shared link back to the main website */
.sitebar{font:500 13px/1.2 var(--sb-font,system-ui,-apple-system,"Segoe UI",sans-serif);background:var(--sb-bg);border-bottom:1px solid var(--sb-line);color:var(--sb-ink)}
.sitebar-in{max-width:var(--sb-max,1400px);margin:0 auto;padding:0 var(--sb-pad,16px);height:36px;display:flex;align-items:center;justify-content:space-between;gap:12px}
.sitebar a{color:inherit;text-decoration:none;border-radius:6px}
.sitebar a:focus-visible{outline:2px solid currentColor;outline-offset:2px}
.sb-home{display:inline-flex;align-items:center;gap:6px;padding:6px 8px 6px 4px;margin-left:-4px;white-space:nowrap}
.sb-home:hover{background:var(--sb-hover)}
.sb-home svg{transition:transform .15s}
.sb-home:hover svg{transform:translateX(-2px)}
.sb-more{display:inline-flex;align-items:center;gap:8px;min-width:0;color:var(--sb-muted)}
.sb-more a{color:var(--sb-ink);text-decoration:underline;text-underline-offset:3px;text-decoration-color:var(--sb-line);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;padding:6px 0}
.sb-more a:hover{text-decoration-color:currentColor}
@media (max-width:560px){.sb-hide,.sb-lbl{display:none}}
@media print{.sitebar{display:none}}
.sitebar{--sb-bg:var(--bg,var(--panel));--sb-line:var(--line);--sb-ink:var(--ink,inherit);--sb-muted:var(--muted);--sb-hover:var(--line);--sb-font:var(--body)}
.sitebar-in{max-width:none;padding-inline:max(16px,env(safe-area-inset-left,0px))}
.sitebar{position:sticky;top:env(safe-area-inset-top,0px);z-index:21}
.top{top:calc(env(safe-area-inset-top,0px) + 37px)}
@media (max-width:480px){html{scroll-padding-top:48px}}

/* Full-screen layout: use the whole viewport width and let tall panels grow with the screen */
.wrap{max-width:none;padding-inline:clamp(16px,2.5vw,48px)}
.sitebar{--sb-max:none;--sb-pad:clamp(16px,2.5vw,48px)}
@media (min-width:1600px){.builder{grid-template-columns:270px minmax(0,1fr) 380px}.mm{grid-template-columns:380px minmax(0,1fr)}.cases{grid-template-columns:320px minmax(0,1fr)}.learn{grid-template-columns:minmax(0,1fr) 460px}.src-grid{grid-template-columns:minmax(0,1fr) 440px}}
@media (min-width:821px){.mm-list{max-height:max(560px,calc(100vh - 260px))}.case-list{max-height:max(760px,calc(100vh - 200px))}}