@font-face{font-family:"Archivo";src:url("../fonts/archivo-var.woff2") format("woff2");font-weight:100 900;font-stretch:62% 125%;font-display:swap}

/* Layout: three columns. Left: the topic map (and key videos for the selected node). Centre: compact filters above the ranked videos. Right: the viewer's queue, saved to their own YouTube account on request. RBlock 2026 tokens. */
:root{
  --blue:#2E2BFF; --night:#0A0C3D; --paper:#F5F6FA; --mist:#DFE2EE; --steel:#50566F; --signal:#FFD23F;
  --bg:var(--paper); --panel:#FFFFFF; --fg:var(--night); --fg2:var(--steel); --rule:var(--mist); --accent:var(--blue); --on-accent:#FFFFFF;
  --chip:#EEF0F7; --chip-on:var(--blue); --hover:#F0F1FA; --focus:var(--signal); --shade:rgba(10,12,61,.72);
  --b-zk:#2E2BFF; --b-enc:#7A2BD6; --b-prim:#0C7A89; --b-pml:#C0185A; --b-aisec:#C8440C; --b-ml:#2D8742; --b-sys:#8A6A00; --b-dist:#3B5B85; --b-data:#646A80;
  --d-crypto:#2E2BFF; --d-meet:#C0185A; --d-ai:#2D8742;
  --font:"Archivo",ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  color-scheme:light;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --bg:#0A0C3D; --panel:#11144F; --fg:#F5F6FA; --fg2:#B9BDF7; --rule:#252A6B; --accent:#8F8DFF; --on-accent:#0A0C3D;
  --chip:#1A1E5E; --chip-on:#8F8DFF; --hover:#181C5A; --shade:rgba(0,0,0,.72);
  --b-zk:#8F8DFF; --b-enc:#C08BFF; --b-prim:#4FC6D3; --b-pml:#FF79AC; --b-aisec:#FF9A62; --b-ml:#6FD38A; --b-sys:#E2C04A; --b-dist:#8FB2E6; --b-data:#AEB3C9;
  --d-crypto:#8F8DFF; --d-meet:#FF79AC; --d-ai:#6FD38A;
  color-scheme:dark;}}
:root[data-theme="dark"]{
  --bg:#0A0C3D; --panel:#11144F; --fg:#F5F6FA; --fg2:#B9BDF7; --rule:#252A6B; --accent:#8F8DFF; --on-accent:#0A0C3D;
  --chip:#1A1E5E; --chip-on:#8F8DFF; --hover:#181C5A; --shade:rgba(0,0,0,.72);
  --b-zk:#8F8DFF; --b-enc:#C08BFF; --b-prim:#4FC6D3; --b-pml:#FF79AC; --b-aisec:#FF9A62; --b-ml:#6FD38A; --b-sys:#E2C04A; --b-dist:#8FB2E6; --b-data:#AEB3C9;
  --d-crypto:#8F8DFF; --d-meet:#FF79AC; --d-ai:#6FD38A;
  color-scheme:dark;}
[hidden]{display:none!important}
html,body{height:100%}
body{background:var(--bg);color:var(--fg);font-family:var(--font);font-size:14px;line-height:1.45;-webkit-font-smoothing:antialiased}
*{box-sizing:border-box}
button,input,select{font:inherit;color:inherit}
a{color:inherit}
:focus-visible{outline:2px solid var(--focus);outline-offset:2px}
.app{height:100%;display:grid;grid-template-rows:auto minmax(0,1fr);grid-template-columns:minmax(0,1fr)}
/* header */
.top{display:flex;align-items:center;gap:18px;padding-block:9px;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px));border-bottom:1px solid var(--rule);background:var(--panel)}
.wm{display:flex;align-items:baseline;gap:8px;text-decoration:none;flex:none}
.wm b{font-stretch:125%;font-weight:750;font-size:19px;letter-spacing:-.01em}
.wm i{display:inline-block;width:.5em;height:.5em;background:var(--accent);margin-left:2px}
.wm small{font-stretch:88%;font-size:10px;letter-spacing:.14em;text-transform:uppercase;color:var(--fg2)}
.top h1{margin:0;font-stretch:125%;font-weight:760;font-size:17px;letter-spacing:-.01em;white-space:nowrap}
.blk{display:inline-block;width:.42em;height:.42em;background:var(--accent);margin-left:5px}
.top .tag{font-stretch:88%;color:var(--fg2);font-size:12.5px;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;flex:1}
.btn{border:1px solid var(--rule);background:var(--panel);padding:5px 10px;cursor:pointer;font-size:12.5px;font-stretch:88%;letter-spacing:.02em}
.btn:hover{background:var(--hover)}
.only-narrow,.only-mid{display:none}
/* columns */
.cols{display:grid;grid-template-columns:clamp(340px,26vw,440px) minmax(0,1fr) clamp(270px,19vw,330px);min-height:0}
.main{min-height:0;overflow:auto;overscroll-behavior:contain}
.mapcol{border-right:1px solid var(--rule);background:var(--panel);display:grid;grid-template-rows:auto minmax(220px,1fr) auto;min-height:0;overflow:hidden}
.qcol{border-left:1px solid var(--rule);background:var(--panel);display:grid;grid-template-rows:auto minmax(0,1fr) auto;min-height:0;overflow:hidden}
/* filters */
.filters{display:flex;flex-direction:column;gap:7px;padding-bottom:8px;margin-bottom:8px;border-bottom:1px solid var(--rule)}
.bar{display:flex;flex-wrap:wrap;gap:8px 12px;align-items:center}
.bar .search{flex:1 1 220px;min-width:0}
.bar .rng{flex:0 1 230px}
.search{width:100%;border:1px solid var(--rule);background:var(--panel);padding:6px 10px;font-size:13.5px}
.modes{display:flex;border:1px solid var(--rule);background:var(--panel)}
.modes button{flex:1;border:0;border-right:1px solid var(--rule);background:transparent;padding:5px 10px;font-size:12px;font-stretch:88%;cursor:pointer;white-space:nowrap}
.modes button:last-child{border-right:0}
.modes button[aria-pressed="true"]{background:var(--accent);color:var(--on-accent)}
.chips{display:flex;flex-wrap:wrap;gap:5px}
.chip{border:0;background:var(--chip);padding:3px 8px;cursor:pointer;font-size:12px;font-stretch:92%;display:inline-flex;gap:5px;align-items:center}
.chip .n{color:var(--fg2);font-variant-numeric:tabular-nums;font-size:10.5px}
.chip[aria-pressed="true"]{background:var(--chip-on);color:var(--on-accent)}
.chip[aria-pressed="true"] .n{color:inherit;opacity:.8}
.rng{display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:8px;align-items:center;font-size:11.5px;font-stretch:88%;color:var(--fg2)}
input[type=range]{width:100%;accent-color:var(--accent)}
.fmeta{display:flex;justify-content:flex-end;align-items:center;gap:12px;font-size:11.5px;color:var(--fg2);font-stretch:92%;margin-left:auto;min-width:0}
.flinks{display:flex;gap:10px;flex:none}
.linkbtn{border:0;background:none;padding:0;cursor:pointer;color:var(--fg2);text-decoration:underline;text-underline-offset:2px;font-size:11.5px}
.linkbtn:hover{color:var(--fg)}
.interest{font-size:11.5px;color:var(--fg2);min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.interest b{color:var(--fg);font-weight:600}
/* map */
.mapbox{position:relative;min-height:0;background:var(--bg);display:grid;grid-template-rows:auto minmax(0,1fr)}
.mhead{display:flex;align-items:center;gap:8px;padding:7px 12px;border-bottom:1px solid var(--rule);background:var(--panel)}
.mhead h2{margin:0;font-stretch:125%;font-weight:720;font-size:13.5px;flex:1}
.mhead .src{font-size:11px;color:var(--fg2);font-stretch:88%}
.mtools{display:flex;gap:4px}
.mtools button{width:26px;height:26px;border:1px solid var(--rule);background:var(--panel);cursor:pointer;font-size:13px;display:grid;place-items:center;padding:0}
.mtools button:hover{background:var(--hover)}
#map{width:100%;height:100%;display:block;cursor:grab;touch-action:none}
#map:active{cursor:grabbing}
.node{cursor:pointer}
.node text{font-family:var(--font);fill:var(--fg);pointer-events:none}
.node .cnt{fill:var(--fg2);font-variant-numeric:tabular-nums}
.node .tog rect{fill:var(--panel);stroke:var(--rule)}
.node .tog text{font-size:11px;fill:var(--fg2)}
.link{fill:none;stroke-opacity:.55}
.xlink{fill:none;stroke:var(--accent);stroke-dasharray:4 3;stroke-opacity:.8}
.xlab{font-size:10px;fill:var(--accent);font-family:var(--font)}
.mapcol.full{position:fixed;inset:0;z-index:40;width:auto;padding-top:env(safe-area-inset-top,0px)}
/* key videos */
.keybox{border-top:1px solid var(--rule)}
.keybox summary{list-style:none;cursor:pointer;padding:8px 12px;font-stretch:88%;font-size:10.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--fg2);font-weight:650;display:flex;gap:6px;align-items:center}
.keybox summary::-webkit-details-marker{display:none}
.keybox summary::before{content:"›";font-size:13px;transition:transform .15s}
.keybox[open] summary::before{transform:rotate(90deg)}
.keyv{padding:0 12px 10px;max-height:30vh;overflow:auto}
.keyv .d{color:var(--fg2);margin:0 0 8px;font-size:12px}
.kv{display:grid;grid-template-columns:96px minmax(0,1fr);gap:9px;align-items:start;padding:5px 0;border:0;background:none;width:100%;text-align:left;cursor:pointer}
.kv:hover .kt{text-decoration:underline;text-decoration-color:var(--accent)}
.kv .sp{aspect-ratio:16/9;width:96px;background-color:var(--chip);background-repeat:no-repeat;position:relative;border-bottom:3px solid var(--bc)}
.kv .sp::after{content:"▶";position:absolute;left:4px;bottom:3px;font-size:10px;color:#fff;text-shadow:0 0 3px #000}
.kv .kt{font-size:12.5px;font-weight:600;line-height:1.3;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.kv .km{font-size:11px;color:var(--fg2);margin-top:2px}
.rel{display:flex;flex-wrap:wrap;gap:5px;margin-top:8px}
.rel .chip i{width:7px;height:7px;display:inline-block;background:var(--bc)}
/* centre head */
.chead{position:sticky;top:0;z-index:2;background:var(--bg);border-bottom:1px solid var(--rule);padding:10px 18px 8px}
.crumb{display:flex;flex-wrap:wrap;gap:6px;align-items:center;font-size:13px}
.crumb .t{font-stretch:125%;font-weight:720;font-size:17px;letter-spacing:-.01em;margin-right:4px}
.pill{display:inline-flex;align-items:center;gap:6px;background:var(--chip);padding:2px 8px;font-size:12px}
.pill button{border:0;background:none;cursor:pointer;padding:0 0 0 2px;color:var(--fg2);font-size:14px;line-height:1}
.cmeta{display:flex;gap:14px;align-items:center;margin-top:4px;font-size:12px;color:var(--fg2);flex-wrap:wrap}
.cmeta select{border:1px solid var(--rule);background:var(--panel);padding:2px 6px;font-size:12px}
.desc-line{margin-top:4px;font-size:12.5px;color:var(--fg2);max-width:90ch}
/* grid of cards */
.list{padding:12px 18px 40px;display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,250px),1fr));gap:12px;align-content:start}
.grp{grid-column:1/-1;display:flex;align-items:center;gap:10px;margin:6px 0 0;font-stretch:88%;font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--fg2);font-weight:650}
.grp::after{content:"";flex:1;height:1px;background:var(--rule)}
.card{background:var(--panel);border:1px solid var(--rule);display:flex;flex-direction:column;min-width:0}
.card.seen .thumb{opacity:.6}
.thumb{position:relative;display:block;width:100%;aspect-ratio:16/9;border:0;padding:0;cursor:pointer;background-color:var(--chip);background-repeat:no-repeat;border-bottom:3px solid var(--bc)}
.thumb .du{position:absolute;right:6px;bottom:6px;background:rgba(10,12,61,.86);color:#fff;font-size:11px;font-weight:600;padding:1px 5px;font-variant-numeric:tabular-nums}
.thumb .play{position:absolute;inset:0;display:grid;place-items:center;opacity:0;transition:opacity .15s;background:rgba(10,12,61,.28)}
.thumb .play span{width:46px;height:46px;background:#2E2BFF;display:grid;place-items:center;color:#fff;font-size:17px}
.thumb:hover .play,.thumb:focus-visible .play{opacity:1}
.band{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:5px 10px;background:color-mix(in srgb,var(--bc) 12%,var(--panel))}
.band .lf{color:var(--bc);font-stretch:88%;font-size:10.5px;letter-spacing:.08em;text-transform:uppercase;font-weight:700;border:0;background:none;padding:0;cursor:pointer;text-align:left;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.band .fm{font-stretch:88%;font-size:11px;color:var(--fg2);border:0;background:none;padding:0;cursor:pointer;white-space:nowrap;display:inline-flex;align-items:center}
.band .fm:hover,.band .lf:hover{text-decoration:underline}
.band .lv{display:inline-flex;gap:2px;margin-left:6px}
.band .lv i{width:7px;height:7px;border:1.5px solid var(--bc)}
.band .lv i.on{background:var(--bc)}
.body{padding:8px 10px 9px;display:flex;flex-direction:column;gap:4px;min-width:0;flex:1}
.ttl{font-weight:650;font-size:13.5px;line-height:1.3;text-decoration:none;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.ttl:hover{text-decoration:underline;text-decoration-color:var(--accent);text-underline-offset:3px}
.by{font-size:11.5px;color:var(--fg2);display:flex;flex-wrap:wrap;gap:0 7px;font-variant-numeric:tabular-nums}
.by b{color:var(--fg);font-weight:600}
.sum{font-size:12.5px;line-height:1.42;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.cc{display:flex;flex-wrap:wrap;gap:4px}
.cc button{border:0;background:var(--chip);padding:1px 6px;font-size:10.5px;cursor:pointer;font-stretch:92%}
.cc button:hover{outline:1px solid var(--rule)}
.foot{display:flex;align-items:center;gap:6px;margin-top:auto;padding-top:3px;flex-wrap:wrap}
.why{display:flex;gap:5px;align-items:center;font-size:10.5px;color:var(--fg2);font-stretch:88%;cursor:pointer;border:0;background:none;padding:0}
.why .mb{display:inline-flex;align-items:flex-end;gap:2px;height:13px}
.why .mb i{width:4px;background:var(--accent);display:block}
.why .mb i.q{background:var(--fg)}
.badge{font-size:9.5px;font-stretch:88%;letter-spacing:.06em;text-transform:uppercase;padding:1px 5px;border:1px solid var(--rule);color:var(--fg2)}
.badge.gem{border-color:var(--accent);color:var(--accent)}
.badge.canon{background:var(--fg);color:var(--bg);border-color:var(--fg)}
.acts{margin-left:auto;display:flex;gap:3px}
.acts button{border:1px solid var(--rule);background:transparent;padding:1px 6px;font-size:11px;cursor:pointer;font-stretch:88%}
.acts button:hover{background:var(--hover)}
.acts button.qadd{border-color:var(--accent);color:var(--accent);font-weight:650}
.acts button.qadd[aria-pressed="true"]{background:var(--accent);color:var(--on-accent)}
.card[draggable="true"]{cursor:grab}
.card.dragging{opacity:.45}
/* queue */
.qhead{display:flex;align-items:baseline;gap:8px;padding:9px 12px;border-bottom:1px solid var(--rule)}
.qhead h2{margin:0;font-stretch:125%;font-weight:720;font-size:13.5px}
.qhead .qm{font-size:11px;color:var(--fg2);font-stretch:88%;flex:1;font-variant-numeric:tabular-nums}
.qlist{overflow:auto;padding:8px 10px;display:flex;flex-direction:column;gap:6px;min-height:0}
.qcol.drop .qlist{outline:2px dashed var(--accent);outline-offset:-6px;background:color-mix(in srgb,var(--accent) 6%,var(--panel))}
.qempty{border:1.5px dashed var(--rule);padding:18px 14px;text-align:center;color:var(--fg2);font-size:12.5px;line-height:1.5}
.qempty b{display:block;color:var(--fg);font-size:13px;margin-bottom:4px}
.qi{display:grid;grid-template-columns:14px 84px minmax(0,1fr) auto;gap:7px;align-items:start;background:var(--bg);border:1px solid var(--rule);padding:5px;cursor:grab}
.qi.dragging{opacity:.4}
.qi.over{box-shadow:0 -3px 0 var(--accent)}
.qi .gr{color:var(--fg2);font-size:11px;line-height:1;padding-top:16px;user-select:none;text-align:center}
.qi .sp{aspect-ratio:16/9;width:84px;background-color:var(--chip);background-repeat:no-repeat;border:0;padding:0;cursor:pointer;border-bottom:3px solid var(--bc)}
.qi .qt{font-size:12px;font-weight:600;line-height:1.3;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.qi .qs{font-size:10.5px;color:var(--fg2);margin-top:2px;font-variant-numeric:tabular-nums}
.qi .qx{display:flex;flex-direction:column;gap:2px}
.qi .qx button{border:0;background:none;color:var(--fg2);cursor:pointer;padding:0 3px;font-size:12px;line-height:1.2}
.qi .qx button:hover{color:var(--fg)}
.qacts{border-top:1px solid var(--rule);padding:10px 12px 12px;display:grid;gap:7px}
.qacts .row{display:flex;gap:6px;flex-wrap:wrap}
.qacts .prim{flex:1;border:0;background:var(--accent);color:var(--on-accent);padding:7px 10px;font-weight:650;font-size:12.5px;cursor:pointer;text-decoration:none;text-align:center}
.qacts .prim:disabled{opacity:.4;cursor:default}
.qacts .yt{background:var(--fg);color:var(--bg)}
.qnote{margin:0;font-size:11px;color:var(--fg2);line-height:1.45}
.more{grid-column:1/-1;justify-self:center;margin-top:6px}
.empty{grid-column:1/-1;padding:40px 0;color:var(--fg2);text-align:center}
.tip{position:fixed;z-index:60;background:var(--fg);color:var(--bg);padding:8px 10px;font-size:11.5px;max-width:280px;pointer-events:none;line-height:1.4;font-variant-numeric:tabular-nums}
.tip table{border-collapse:collapse}
.tip td{padding:1px 6px 1px 0}
.tip td:last-child{text-align:right}
/* player */
.player{position:fixed;inset:0;z-index:70;background:var(--shade);display:grid;place-items:center;padding:max(16px,env(safe-area-inset-top,0px)) max(16px,env(safe-area-inset-right,0px)) 16px max(16px,env(safe-area-inset-left,0px))}
.pbox{background:var(--panel);width:min(980px,100%);max-height:100%;overflow:auto;border-top:4px solid var(--bc)}
.pvid{position:relative;aspect-ratio:16/9;background-color:#000;background-repeat:no-repeat}
.pvid iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.pvid .blocked{position:absolute;inset:0;display:grid;place-items:center;background:rgba(10,12,61,.6);color:#fff;text-align:center;padding:20px}
.pvid .blocked a{display:inline-block;margin-top:10px;background:#2E2BFF;color:#fff;text-decoration:none;padding:9px 16px;font-weight:650}
.pinfo{padding:12px 16px 16px;display:grid;gap:6px}
.pinfo h3{margin:0;font-size:17px;font-stretch:110%;line-height:1.3}
.prow{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.prow a.yt{background:var(--accent);color:var(--on-accent);text-decoration:none;padding:6px 12px;font-size:12.5px;font-weight:650}
.how-pop{position:fixed;z-index:65;right:max(16px,env(safe-area-inset-right,0px));bottom:16px;width:min(460px,calc(100% - 32px));max-height:70vh;overflow:auto;background:var(--panel);border:1px solid var(--rule);box-shadow:0 10px 40px rgba(10,12,61,.25);padding:14px 16px;font-size:12.5px;color:var(--fg2)}
.how-pop h3{margin:0 0 6px;color:var(--fg);font-stretch:110%;display:flex;justify-content:space-between}
.how-pop code{font-size:11.5px;background:var(--chip);padding:1px 4px}
.how-pop .line{color:var(--fg);font-stretch:125%;font-weight:700;margin-top:10px}
/* responsive */
@media (max-width:1399px){
  .cols{grid-template-columns:clamp(300px,28vw,380px) minmax(0,1fr)}
  .qcol{display:none}
  .qcol.open{display:grid;position:fixed;inset:0 0 0 auto;width:min(360px,100%);z-index:40;box-shadow:-8px 0 30px rgba(10,12,61,.2);padding-top:env(safe-area-inset-top,0px)}
  .only-mid{display:inline-block}
}
@media (max-width:1099px){
  .cols{grid-template-columns:minmax(0,1fr)}
  .mapcol{display:none}
  .mapcol.open{display:grid;position:fixed;inset:0 auto 0 0;width:min(440px,100%);z-index:40;box-shadow:8px 0 30px rgba(10,12,61,.2);padding-top:env(safe-area-inset-top,0px)}
  .only-narrow{display:inline-block}
}
@media (max-width:640px){
  .top{flex-wrap:wrap;gap:8px 12px}
  .top .tag,.wm small{display:none}
  .top h1{font-size:15px;white-space:normal;flex:1}
  .list{padding:10px 12px 40px;grid-template-columns:minmax(0,1fr)}
  .chead{padding:8px 12px}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}

.tnav{display:flex;gap:14px;font-size:12.5px;font-stretch:92%}
.tnav a{text-decoration:none;color:var(--fg2)}
.tnav a:hover,.tnav a[aria-current]{color:var(--fg)}
@media (max-width:1100px){.tnav{display:none}}