/* Explore (/explore) — isolated discovery + learning-path app. Self-contained; shares
   nothing with the knowledge/research sites. Accent is set per-section via --acc. */
:root{
  --bg:#101513;--bg-2:#131a17;--ink:#f4f1e8;--soft:#c7d0c8;--muted:#9fb0a8;
  --line:rgba(255,255,255,.10);--card:#18221e;--card-2:#212d28;--acc:#7fd8c4;
  --sans:'Inter',-apple-system,'Segoe UI',Roboto,Arial,sans-serif;--serif:'Newsreader',Georgia,serif;
  --f0:#7fd8c4;--f1:#8fc4f0;--f2:#c3a8ee;--f3:#f0b48c;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:linear-gradient(180deg,var(--bg) 0%,var(--bg-2) 55%,color-mix(in srgb,var(--acc) 12%,var(--bg)) 100%) fixed;color:var(--ink);font:16px/1.55 var(--sans);-webkit-font-smoothing:antialiased;padding-bottom:60px}
a{color:inherit;text-decoration:none}
.bggrid{position:fixed;inset:0;z-index:0;pointer-events:none;background-image:linear-gradient(rgba(244,241,232,.02) 1px,transparent 1px),linear-gradient(90deg,rgba(244,241,232,.02) 1px,transparent 1px);background-size:52px 52px;-webkit-mask-image:radial-gradient(ellipse 92% 82% at 50% 20%,#000 55%,transparent 100%);mask-image:radial-gradient(ellipse 92% 82% at 50% 20%,#000 55%,transparent 100%)}
.bgglow{position:fixed;inset:0;z-index:0;pointer-events:none;background:radial-gradient(820px 460px at 84% -12%,color-mix(in srgb,var(--acc) 15%,transparent),transparent 60%),radial-gradient(720px 540px at 6% 112%,color-mix(in srgb,var(--acc) 9%,transparent),transparent 62%)}
body>*{position:relative;z-index:1}
.wrap{max-width:1160px;margin:0 auto;padding:0 22px}

/* Header */
.top{position:sticky;top:0;z-index:30;background:color-mix(in srgb,var(--bg) 86%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.top .wrap{display:flex;align-items:center;gap:16px;padding:13px 26px;max-width:none;margin:0}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;letter-spacing:-.01em}
.brand .logo{width:34px;height:34px;border-radius:9px;background:#0e1613;display:grid;place-items:center;border:1px solid var(--line)}
.brand small{display:block;font-weight:500;color:var(--muted);font-size:11.5px;margin-top:2px}
.tabs{display:inline-flex;background:var(--card);border:1px solid var(--line);border-radius:999px;padding:4px;gap:4px;margin-left:6px}
.tab{border:0;background:none;color:var(--muted);font:700 12.5px var(--sans);padding:7px 15px;border-radius:999px;cursor:pointer;letter-spacing:.02em}
.tab.on{background:color-mix(in srgb,var(--acc) 20%,transparent);color:var(--ink)}
.top .sp{flex:1}
.xlink{color:var(--muted);font:600 12.5px var(--sans);border:1px solid var(--line);border-radius:999px;padding:6px 13px;white-space:nowrap}
.xlink svg{vertical-align:-2px;margin-right:5px}
.xlink:hover{color:var(--ink);border-color:var(--acc)}

/* Search */
.searchbar{display:flex;align-items:center;gap:9px;background:color-mix(in srgb,var(--ink) 5%,transparent);border:1px solid var(--line);border-radius:12px;padding:11px 15px;margin:20px 0 14px;transition:border-color .18s,box-shadow .18s}
.searchbar:focus-within{border-color:var(--acc);box-shadow:0 0 0 3px color-mix(in srgb,var(--acc) 15%,transparent)}
.searchbar input{flex:1;min-width:0;background:none;border:0;outline:0;color:var(--ink);font-size:15.5px}
.searchbar .k{font:600 11px var(--sans);color:var(--muted);border:1px solid var(--line);border-radius:6px;padding:2px 7px}

/* Facets */
.facets{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin:0 0 8px}
.fgroup{display:inline-flex;flex-wrap:wrap;gap:6px;align-items:center}
.flabel{font:700 10.5px var(--sans);text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin-right:2px}
.chip{border:1px solid var(--line);background:var(--card);color:var(--soft);font:600 12px var(--sans);padding:5px 11px;border-radius:999px;cursor:pointer;white-space:nowrap;transition:.14s}
.chip:hover{border-color:color-mix(in srgb,var(--acc) 50%,var(--line));color:var(--ink)}
.chip.on{background:color-mix(in srgb,var(--acc) 22%,transparent);border-color:color-mix(in srgb,var(--acc) 55%,var(--line));color:var(--ink)}
.chip .dot{display:inline-block;width:7px;height:7px;border-radius:50%;margin-right:6px;vertical-align:middle}
.fsel{background:var(--card);border:1px solid var(--line);color:var(--ink);font:600 12px var(--sans);border-radius:999px;padding:6px 26px 6px 11px;cursor:pointer;appearance:none;background-image:url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="10" height="10" viewBox="0 0 24 24" fill="none" stroke="%239fb0a8" stroke-width="3" stroke-linecap="round"><path d="m6 9 6 6 6-6"/></svg>');background-repeat:no-repeat;background-position:right 10px center}
.fsel:focus{outline:none;border-color:var(--acc)}
.fclear{color:var(--muted);font:600 12px var(--sans);cursor:pointer;padding:5px 8px}
.fclear:hover{color:var(--acc)}
.countbar{color:var(--muted);font-size:13px;margin:6px 2px 12px}
.countbar b{color:var(--ink)}
.lvhead{display:flex;align-items:center;gap:12px;margin:22px 2px 10px}
.lvhead:first-child{margin-top:4px}
.lvbadge{font:800 11px var(--sans);text-transform:uppercase;letter-spacing:.1em;color:var(--acc)}
.lvline{flex:1;height:1px;background:linear-gradient(90deg,color-mix(in srgb,var(--acc) 45%,transparent),transparent)}

/* Result rows */
.rows{display:flex;flex-direction:column;gap:9px}
.row{display:flex;align-items:center;gap:14px;border:1px solid var(--line);border-radius:13px;background:linear-gradient(180deg,color-mix(in srgb,var(--ink) 7%,var(--card)),var(--card) 70%);padding:13px 16px;transition:transform .15s,border-color .15s}
.row:hover{transform:translateY(-2px);border-color:color-mix(in srgb,var(--acc) 42%,var(--line))}
.row .lv{flex:none;width:9px;height:9px;border-radius:50%;background:var(--acc)}
.row .mid{flex:1;min-width:0}
.row .tt{font-size:15px;color:var(--ink);font-weight:600;line-height:1.32}
.row .meta{display:flex;flex-wrap:wrap;gap:7px;align-items:center;margin-top:5px;color:var(--muted);font-size:12px}
.row .b{border:1px solid var(--line);border-radius:6px;padding:1px 7px;font-weight:600}
.row .b.trk{color:var(--ink);border-color:color-mix(in srgb,var(--acc) 40%,var(--line))}
.row .b.mod{color:var(--soft)}
.row .b.lvl{text-transform:capitalize}
.row .dek{color:var(--muted);font-size:12.5px;margin-top:4px;line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.row .acts{flex:none;display:inline-flex;gap:7px}
.act{display:inline-flex;align-items:center;gap:.35rem;padding:.4rem .8rem;border-radius:999px;border:1px solid var(--line);background:color-mix(in srgb,var(--ink) 5%,transparent);font-weight:700;font-size:.8rem;color:var(--soft);transition:.14s;white-space:nowrap}
.act:hover{border-color:var(--acc);color:var(--ink);background:color-mix(in srgb,var(--acc) 12%,transparent)}
.act.read::before{content:"\1F4D6";font-size:.9em}.act.listen::before{content:"\25B6\FE0F";font-size:.9em}
.act.disabled{opacity:.5;cursor:default;pointer-events:none}
mark{background:color-mix(in srgb,var(--acc) 34%,transparent);color:var(--ink);border-radius:3px;padding:0 2px}
.step .card .snip{margin-top:8px;font-size:12.5px;line-height:1.5;color:var(--muted);border-left:2px solid color-mix(in srgb,var(--acc) 45%,var(--line));padding-left:9px}
.pmatch{display:inline-block;margin:0 0 10px;font:700 10px var(--sans);letter-spacing:.04em;color:var(--acc);border:1px solid color-mix(in srgb,var(--acc) 40%,var(--line));border-radius:999px;padding:2px 8px}
.empty{padding:40px 12px;text-align:center;color:var(--muted)}

/* Hero (paths landing) */
.phero{padding:26px 0 6px}
.phero h1{font-family:var(--serif);font-weight:600;font-size:clamp(26px,3.6vw,38px);margin:0 0 8px;letter-spacing:-.01em}
.phero p{color:var(--soft);max-width:64ch;margin:0}
.xhero{padding:22px 0 4px}
.xhero h1{font-size:clamp(24px,3vw,32px)}
.xhero p{font-size:14px;line-height:1.55}

/* Path cards */
.pgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(310px,1fr));gap:16px;margin:18px 0}
.pcard{display:flex;flex-direction:column;border:1px solid var(--line);border-radius:16px;background:linear-gradient(180deg,color-mix(in srgb,var(--ink) 8%,var(--card)),var(--card) 66%);padding:18px 20px;cursor:pointer;transition:transform .18s,border-color .18s}
.pcard:hover{transform:translateY(-4px);border-color:color-mix(in srgb,var(--acc) 45%,var(--line))}
.pcard .pk{display:inline-flex;align-items:center;gap:8px;font:700 10.5px var(--sans);text-transform:uppercase;letter-spacing:.1em;color:var(--acc);margin-bottom:9px}
.pcard .pk .d{width:9px;height:9px;border-radius:50%;background:var(--acc)}
.pcard h3{font-size:17.5px;margin:0 0 6px;letter-spacing:-.01em}
.pcard .pb{color:var(--soft);font-size:13px;line-height:1.5;margin:0 0 12px;flex:1}
.pcard .pf{display:flex;align-items:center;gap:10px;color:var(--muted);font-size:12px}
.pcard .prog{flex:1;height:6px;border-radius:999px;background:color-mix(in srgb,var(--ink) 10%,transparent);overflow:hidden}
.pcard .prog i{display:block;height:100%;background:var(--acc);border-radius:999px;transition:width .3s}
.psec{margin:26px 0 8px;display:flex;align-items:center;gap:12px}
.psec h2{font-size:13px;letter-spacing:.04em;text-transform:uppercase;color:var(--soft);margin:0;font-weight:700}
.psec .bar{flex:1;height:1px;background:linear-gradient(90deg,color-mix(in srgb,var(--ink) 20%,transparent),transparent 70%)}

/* Path detail stepper */
.back{display:inline-flex;align-items:center;gap:6px;color:var(--muted);font:600 12.5px var(--sans);margin:20px 0 8px;padding:6px 12px;border:1px solid var(--line);border-radius:999px;background:var(--card);cursor:pointer;width:max-content}
.back:hover{color:var(--ink);border-color:var(--acc)}
.dhead{padding:8px 0 6px}
.dhead h1{font-family:var(--serif);font-weight:600;font-size:clamp(24px,3.2vw,34px);margin:.1rem 0 .4rem}
.dhead p{color:var(--soft);max-width:70ch;margin:0 0 12px}
.dprog{display:flex;align-items:center;gap:12px;margin:6px 0 18px}
.dprog .prog{flex:1;max-width:360px;height:8px;border-radius:999px;background:color-mix(in srgb,var(--ink) 10%,transparent);overflow:hidden}
.dprog .prog i{display:block;height:100%;background:var(--acc);border-radius:999px;transition:width .3s}
.dprog .pct{color:var(--muted);font-size:13px;font-weight:600}
.dprog .rs{color:var(--muted);font-size:12px}
.dsearch{margin:8px 0 14px}
.pnote{font-size:12px;color:var(--acc);border-bottom:1px dotted color-mix(in srgb,var(--acc) 60%,transparent);cursor:help;white-space:nowrap}
.pnote:hover,.pnote:focus{color:var(--ink);outline:none;border-bottom-color:var(--ink)}
.steps{display:flex;flex-direction:column;gap:0;margin:6px 0}
.step{display:flex;gap:14px;padding:4px 0}
.step .rail{flex:none;display:flex;flex-direction:column;align-items:center;width:30px}
.step .node{width:26px;height:26px;border-radius:50%;border:2px solid var(--line);display:grid;place-items:center;font:800 12px var(--sans);color:var(--muted);background:var(--bg-2);cursor:pointer;transition:.15s}
.step .node:hover{border-color:var(--acc)}
.step.done .node{background:var(--acc);border-color:var(--acc);color:#0e1613}
.step .line{flex:1;width:2px;background:var(--line);margin:2px 0}
.step:last-child .line{display:none}
.step .card{flex:1;border:1px solid var(--line);border-radius:12px;background:linear-gradient(180deg,color-mix(in srgb,var(--ink) 7%,var(--card)),var(--card) 70%);padding:12px 15px;margin-bottom:12px}
.step.next .card{border-color:color-mix(in srgb,var(--acc) 55%,var(--line));box-shadow:0 0 0 3px color-mix(in srgb,var(--acc) 12%,transparent)}
.step .card .tt{font-size:15px;font-weight:600;color:var(--ink);line-height:1.32}
.step.done .card .tt{color:var(--soft)}
.step .card .meta{display:flex;flex-wrap:wrap;gap:7px;align-items:center;margin-top:6px;color:var(--muted);font-size:12px}
.step .card .dek{color:var(--soft);font-size:13px;margin-top:6px;line-height:1.55}
.step .card .acts{display:inline-flex;gap:7px;margin-top:10px}
.xexplore .step .node{width:auto;min-width:26px;padding:0 6px;cursor:pointer}
.xexplore .step .node:hover{border-color:var(--acc);color:var(--ink)}
.xdone{display:flex;flex-wrap:wrap;align-items:center;gap:12px;margin:4px 2px 2px;font-size:12.5px}
.xdone .dcount{color:var(--soft);font-weight:600}
.xdone .dcount.muted{color:var(--muted);font-weight:500}
.clearbtn{background:none;border:1px solid var(--line);color:var(--muted);font:600 11.5px var(--sans);border-radius:999px;padding:3px 11px;cursor:pointer;transition:.14s}
.clearbtn:hover{color:var(--ink);border-color:var(--acc)}
.nextpill{display:inline-block;font:700 9.5px var(--sans);text-transform:uppercase;letter-spacing:.09em;color:var(--acc);border:1px solid color-mix(in srgb,var(--acc) 40%,var(--line));border-radius:999px;padding:2px 8px;margin-bottom:7px}

footer{position:fixed;left:0;right:0;bottom:0;z-index:20;border-top:1px solid var(--line);color:var(--muted);font-size:12.5px;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(10px)}
footer .wrap{display:flex;justify-content:space-between;gap:16px;padding:13px 22px}
footer a{color:var(--soft);text-decoration:none;border-bottom:1px solid transparent;transition:.14s}
footer a:hover{color:var(--acc);border-bottom-color:color-mix(in srgb,var(--acc) 55%,transparent)}
.pdoctitle{font-weight:700;font-size:14px;color:var(--ink);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}

@media(max-width:820px){.top .wrap{flex-wrap:wrap}.tabs{order:3;width:100%;justify-content:center}.row{flex-wrap:wrap}.row .acts{width:100%;justify-content:flex-start}}
@media(max-width:560px){footer .wrap{flex-direction:column;gap:2px;align-items:center}body{padding-bottom:76px}}

/* Chooser (explore root) */
.choose{min-height:calc(100vh - 120px);display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:40px 22px 76px;position:relative;z-index:1}
.chero{max-width:860px;margin-bottom:34px}
.ceyebrow{display:inline-flex;align-items:center;gap:8px;font:700 11px var(--sans);text-transform:uppercase;letter-spacing:.13em;color:var(--soft);border:1px solid var(--line);background:color-mix(in srgb,var(--acc) 8%,transparent);border-radius:999px;padding:6px 14px;margin-bottom:20px}
.ceyebrow .cdot{width:7px;height:7px;border-radius:50%;background:var(--acc);box-shadow:0 0 0 4px color-mix(in srgb,var(--acc) 20%,transparent)}
.ckicker{display:inline-block;font:700 11px var(--sans);text-transform:uppercase;letter-spacing:.18em;color:var(--acc);margin-bottom:14px}
.chero h1{font-family:var(--serif);font-weight:600;font-size:clamp(30px,4.4vw,48px);line-height:1.08;letter-spacing:-.02em;margin:0 0 14px}
.chero p{color:var(--soft);font-size:clamp(14px,1.55vw,16.5px);line-height:1.6;max-width:66ch;margin:0 auto}
.cchips{display:flex;flex-wrap:wrap;justify-content:center;gap:8px;margin-top:20px}
.cchips span{font:600 12px var(--sans);color:var(--soft);border:1px solid var(--line);border-radius:999px;padding:5px 12px;background:color-mix(in srgb,var(--ink) 4%,transparent)}
.ccards{display:grid;grid-template-columns:repeat(auto-fit,minmax(290px,380px));gap:22px;justify-content:center;width:100%;max-width:800px}
.ccard{position:relative;display:flex;flex-direction:column;text-align:left;border:1px solid var(--line);border-radius:20px;background:linear-gradient(180deg,color-mix(in srgb,var(--cx) 7%,var(--card)),var(--card) 72%);padding:26px 26px 24px;overflow:hidden;transition:transform .18s,border-color .18s,box-shadow .18s}
.ccard::before{content:"";position:absolute;left:0;right:0;top:0;height:3px;background:linear-gradient(90deg,var(--cx),transparent)}
.ccard:hover{transform:translateY(-5px);border-color:color-mix(in srgb,var(--cx) 55%,var(--line));box-shadow:0 20px 44px -26px color-mix(in srgb,var(--cx) 65%,transparent)}
.ccard.primary{border-color:color-mix(in srgb,var(--cx) 42%,var(--line))}
.ctag{position:absolute;top:16px;right:16px;font:800 9.5px var(--sans);text-transform:uppercase;letter-spacing:.1em;color:var(--cx);border:1px solid color-mix(in srgb,var(--cx) 45%,var(--line));border-radius:999px;padding:3px 9px}
.cemblem{display:grid;place-items:center;width:50px;height:50px;border-radius:14px;background:color-mix(in srgb,var(--cx) 16%,transparent);color:var(--cx);margin-bottom:15px}
.cemblem svg{width:25px;height:25px}
.ccard h2{margin:0 0 8px;font-size:22px;letter-spacing:-.01em}
.ccard p{color:var(--soft);font-size:13.5px;line-height:1.55;margin:0 0 18px;flex:1}
.cgo{display:inline-flex;align-items:center;gap:6px;align-self:flex-start;font:700 13px var(--sans);color:#0e1613;background:var(--cx);border-radius:999px;padding:9px 16px;transition:filter .16s,transform .16s}
.ccard:hover .cgo{filter:brightness(1.07);transform:translateX(2px)}
@media(max-width:560px){.choose{padding:30px 18px 76px}}

/* Reading pane — full-page in-Explore takeover (feels like the real page) */
.pane{position:fixed;inset:0;z-index:100;display:flex}
.pane-bd{display:none}
.pane-card{position:relative;width:100vw;height:100vh;display:flex;flex-direction:column;background:var(--bg-2);border:0;border-radius:0;overflow:hidden}
.pane-head{border-bottom:1px solid var(--line);background:color-mix(in srgb,var(--bg) 82%,transparent)}
.pane-top{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:9px;padding:8px 14px;overflow:hidden}
.pt-l{justify-self:start;display:flex;align-items:center;min-width:0}
.pt-c{justify-self:center;min-width:0;max-width:100%;overflow:hidden}
.pt-r{justify-self:end;display:flex;align-items:center}
.ptitle-link{display:inline-flex;align-items:center;gap:7px;max-width:100%;font-weight:700;font-size:14.5px;color:var(--ink);text-decoration:none;white-space:nowrap;overflow:hidden}
.ptitle-link .ptxt{overflow:hidden;text-overflow:ellipsis}
.pgap{flex:1}
.sep{color:var(--muted);opacity:.4;font-weight:400}
.psub{font:600 12px var(--sans);color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.pbtn svg{vertical-align:-2px;margin-right:5px}
.pbtn{border:1px solid var(--line);background:var(--card);color:var(--soft);font:700 12px var(--sans);padding:6px 12px;border-radius:999px;cursor:pointer;white-space:nowrap;transition:.14s}
.pbtn:hover{color:var(--ink);border-color:var(--acc)}
.pbtn.go{background:color-mix(in srgb,var(--acc) 26%,transparent);border-color:color-mix(in srgb,var(--acc) 52%,var(--line));color:var(--ink)}
.pbtn.back{border-color:color-mix(in srgb,var(--acc) 45%,var(--line));color:var(--ink);font-weight:800;margin:0}
.pbtn.mark.on{background:color-mix(in srgb,var(--acc) 24%,transparent);border-color:color-mix(in srgb,var(--acc) 52%,var(--line));color:var(--ink)}
.pfmts{display:inline-flex;background:var(--card);border:1px solid var(--line);border-radius:999px;padding:3px;gap:3px;flex:none}
.pfmt{border:0;background:none;color:var(--muted);font:700 12px var(--sans);padding:5px 11px;border-radius:999px;cursor:pointer}
.pfmt.on{background:color-mix(in srgb,var(--acc) 22%,transparent);color:var(--ink)}
.pbadge{font:700 12px var(--sans);color:var(--soft);border:1px solid var(--line);border-radius:999px;padding:6px 12px;flex:none}
.pane-path{display:flex;align-items:center;gap:10px;padding:9px 14px;border-top:1px solid var(--line);background:color-mix(in srgb,var(--acc) 7%,transparent)}
.pstep{font:700 12px var(--sans);color:var(--soft);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.pane-frame{flex:1;width:100%;border:0;background:var(--bg)}
.pane-foot{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:7px 14px;border-top:1px solid var(--line);background:color-mix(in srgb,var(--bg) 82%,transparent)}
.pane-foot .pb-l{min-width:0;overflow:hidden;display:flex;align-items:center}
.pane-foot .pb-r{flex:none;display:flex;align-items:center;gap:8px}
@media(max-width:760px){.pane-card{width:100vw;height:100vh;border-radius:0}}