:root{--navy:#15213A;--blue:#2459C4;--orange:#E07A1F;--oink:#A4520C;--teal:#1F8A7A;--ink:#15213A;--muted:#5D6573;--panel:#F3F5F9;--line:#D5DBE6;--codebg:#1B2742;--outbg:#EEF2F8;--warm:#FDF0E3;--bsoft:#E3EAF8;--osoft:#FBE3CC;--tsoft:#E3F2EF;--red:#B4432A;
--sans:Calibri,"Segoe UI",Carlito,"Helvetica Neue",Arial,sans-serif;--head:Arial,"Helvetica Neue","Liberation Sans",sans-serif;--mono:"Courier New","Liberation Mono",Consolas,monospace}
*{box-sizing:border-box}
html,body{margin:0;height:100%;background:#0d1424;font-family:var(--sans);color:var(--ink)}
#stage{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;overflow:hidden}
#deck{width:1280px;height:720px;position:relative;transform-origin:center center;flex:none}
.slide{position:absolute;inset:0;background:#fff;display:none;overflow:hidden}
.slide.active{display:block}
.slide .inner{position:absolute;left:58px;right:58px;top:34px;bottom:46px;display:flex;flex-direction:column}
.slide.dark,.slide.navy{background:var(--navy);color:#fff}
.slide.warm{background:var(--warm)}
.frag{opacity:0;transition:opacity .35s}
.frag.on{opacity:1}
tr.frag{visibility:hidden}tr.frag.on{visibility:visible}
h1,h2,h3{font-family:var(--head);margin:0}
.st{font-size:30px;margin:4px 0 18px;color:var(--navy)}
.st.light{color:#fff}
.lead{font-size:18px;margin:0 0 14px;line-height:1.35}
.muted{color:var(--muted)}.small{font-size:13px}.c{text-align:center}.blue{color:var(--blue)}.o{color:var(--oink)}.lightm{color:#B9C1D0}
code{font-family:var(--mono);color:var(--oink);font-size:.95em}
.two{display:flex;gap:28px;align-items:flex-start;flex:1;min-height:0}
.two.even>*{flex:1}
.l45{width:44%}.r55{width:56%}.l30{width:30%}.r70{width:70%}.w45{width:45%}.w55{width:55%}.w58{width:58%}.w42{width:42%}.w62{width:62%}.w38{width:38%}.w70{width:70%}.w30{width:30%}.grow{flex:1}
.bul{list-style:none;padding:0;margin:0 0 12px;font-size:20px;line-height:1.35}
.bul.small{font-size:17px}
.bul li{position:relative;padding-left:24px;margin-bottom:14px}
.bul li:before{content:"";position:absolute;left:2px;top:.5em;width:10px;height:10px;border-radius:50%;background:var(--orange)}
.cc{border-radius:10px;margin-bottom:14px;overflow:hidden}
.cc.dark{background:var(--codebg);color:#E8ECF4}
.cc.light{background:var(--outbg);border:1px solid var(--line)}
.cc .lab{font-size:11px;font-weight:700;color:#8FA0C0;padding:7px 14px 0;display:flex;justify-content:space-between}
.cc.light .lab{color:var(--muted)}
.cc pre{margin:0;padding:6px 14px 12px;font-family:var(--mono);line-height:1.3;white-space:pre;overflow-x:auto}
.copy{background:#2E3D5E;color:#cfd8ea;border:0;border-radius:6px;font-size:11px;padding:2px 8px;cursor:pointer}
.ul{border-bottom:4px solid var(--c);padding-bottom:1px}
.ul.frag{opacity:1}.ul.frag:not(.on){border-bottom-color:transparent}
.calls{display:flex;flex-direction:column;gap:12px;padding-top:8px}
.call{border:2px solid var(--c);border-left-width:10px;border-radius:8px;padding:8px 12px;font-size:16px;background:#fff;color:var(--ink)}
/* title */
.slide.title .inner{justify-content:center}
.tleft{width:56%}
.kick{color:var(--orange);font-family:var(--head);font-weight:700;letter-spacing:3px;font-size:16px;margin-bottom:16px}
.slide.title h1{font-size:46px;line-height:1.1;margin-bottom:24px}
.sub{font-size:21px;color:#D9DEE8;margin:0 0 70px}
.byline{font-size:14px;color:#B9C1D0;position:absolute;bottom:0}
.sig{position:absolute;right:0;top:34%;width:470px;background:#22335A;border:1px solid #33477A;border-radius:12px;padding:16px 22px}
.sig .lab{color:#8FA0C0;font-size:13px;margin-bottom:10px}.sig pre{margin:0;font-family:var(--mono);font-size:17px;color:#E8ECF4;white-space:pre-wrap}
.coverart{position:absolute;right:20px;top:60px;width:440px}
.divc{margin:auto 0}.divc h1{font-size:50px}
/* roadmap */
.track{display:flex;justify-content:space-between;position:relative;margin:30px 20px 34px}
.track:before{content:"";position:absolute;left:30px;right:30px;top:26px;height:3px;background:var(--line)}
.stage{position:relative;display:flex;flex-direction:column;align-items:center;width:110px}
.stage .dot{width:52px;height:52px;border-radius:50%;background:#fff;border:2px solid var(--navy);display:flex;align-items:center;justify-content:center;font-weight:700;font-family:var(--head);font-size:14px;z-index:1}
.stage.past .dot{background:var(--teal);border-color:var(--teal);color:#fff}
.stage.cur .dot{background:var(--orange);border-color:var(--orange);color:#fff;transform:scale(1.3)}
.stage .sl{font-size:13px;color:var(--muted);text-align:center;margin-top:12px}.stage.cur .sl{color:var(--ink);font-weight:700}
.today{position:absolute;top:-30px;font-size:13px;font-weight:700;color:var(--oink)}
.goals{background:var(--panel);border-radius:12px;padding:20px 28px;flex:1}
.goals h3{font-size:19px;margin-bottom:12px}
.goals ol,.tasks,.steps{list-style:none;padding:0;margin:0}
.goals li{display:flex;align-items:center;gap:14px;font-size:17px;margin:9px 0}
.n{flex:none;width:30px;height:30px;border-radius:50%;background:var(--navy);color:#fff;display:inline-flex;align-items:center;justify-content:center;font-weight:700;font-size:13px}
.goals .n,.n.o{background:var(--orange)}
/* cards */
.cards{display:grid;gap:26px;flex:1;max-height:420px}
.cards.tall2,.cards.tasks{max-height:none}
.cardx{background:var(--panel);border-radius:12px;padding:22px;position:relative}
.cardx .num{width:40px;height:40px;border-radius:50%;background:var(--orange);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-family:var(--head);margin-bottom:14px}
.cardx h3{font-size:21px;color:var(--navy);margin-bottom:10px}
.cardx p{margin:0;line-height:1.35}
.cards.tasks .cardx{padding:16px 18px}.cards.tasks .num{width:32px;height:32px;font-size:14px;margin:0 10px 8px 0;float:left}
.cards.tasks h3{font-size:17px;line-height:32px}
.due{color:var(--oink);font-weight:700;margin:-8px 0 14px}
.submit{background:var(--navy);color:#fff;border-radius:10px;padding:12px 20px;font-size:15px;margin-top:16px}
/* tables */
.tb{border-collapse:collapse;width:100%;font-size:16px}
.tb th{background:var(--navy);color:#fff;text-align:left;padding:8px 12px;font-weight:700}
.tb td{border:1px solid var(--line);padding:7px 12px;vertical-align:middle}
.tb pre{margin:0;font-family:var(--mono);font-size:14px;white-space:pre-wrap}
.errs td:first-child{background:var(--panel)}.errs .err pre{color:var(--red);font-size:13px}
.cheat td:first-child{background:var(--panel);width:55%}.cheat td:first-child code{font-weight:700}
.plain .c0{background:var(--panel);font-weight:700}
.trace th{text-align:center}.trace td{text-align:center;font-family:var(--mono);font-size:15px}
.trace tr:nth-child(odd) td{background:var(--panel)}
.t{color:#17695D}.f{color:var(--red)}.bl{font-weight:700}
.opt td:first-child{background:var(--panel)}.opt .res code{font-weight:700}
.toy td{text-align:center;font-family:var(--head);font-size:18px}.toy td:first-child{text-align:left;font-family:var(--sans)}
.toy .hit{background:var(--osoft);color:var(--oink);font-weight:700}.toy .zero{color:#9AA3B2}
.dt td,.dt th{text-align:center}.dt td:first-child,.dt th:first-child{text-align:left}
.dt th.lab{background:var(--orange);color:var(--navy)}.dt td.lab{background:var(--osoft);color:var(--oink);font-weight:700}.dt tr.hl td{background:var(--bsoft)}
.dn{border-left:6px solid var(--c);padding:4px 12px;margin-bottom:16px}.dn b{color:var(--c);font-size:17px}.dn p{margin:4px 0 0}
/* figures */
.figwrap{display:flex;justify-content:center;align-items:flex-start;min-height:0}
.figwrap img,.fig{max-width:100%;max-height:520px;object-fit:contain}
.figwrap.big{flex:1;align-items:center}.figwrap.big img{max-height:560px}
/* video */
.vid{width:100%;border-radius:10px;background:#000;display:block}
.recapw{display:flex;justify-content:center;flex:1;min-height:0}.vid.big{height:560px;width:auto;max-width:100%;border:2px solid #3B4D75}
.kick2{color:var(--oink);font-weight:700;letter-spacing:1px;font-size:14px}
/* predict / stat / matrix */
.pill{display:inline-block;background:var(--orange);color:var(--navy);font-weight:700;border-radius:20px;padding:5px 16px;font-size:14px;vertical-align:middle;font-family:var(--head)}
.pill.o{align-self:flex-start;margin:-6px 0 12px}
.qbox{background:var(--panel);border-radius:14px;text-align:center;padding:20px;align-self:stretch}
.qbox .qm{font-size:130px;font-weight:700;color:var(--orange);font-family:var(--head);line-height:1.1}
.qbox p{font-size:19px}
.qbox.dark{background:#1E2D4D;color:#fff}
.stats .big{font-size:64px;font-weight:700;font-family:var(--head)}.stats .big.o{color:var(--orange)}.stats p{margin:0 0 18px;font-size:18px}
.stats .note{background:var(--panel);border-radius:10px;padding:14px;font-weight:700}
.matrix{display:grid;grid-template-columns:110px 1fr 1fr;gap:10px;align-items:center}
.mh{font-weight:700;color:var(--muted);text-align:center}.mh.r{text-align:right}
.mc{border-radius:12px;padding:18px 10px;text-align:center;min-height:170px;display:flex;flex-direction:column;justify-content:center}
.mc b{font-size:44px;font-family:var(--head)}.mc span{font-size:14px;margin-top:8px}
.mc.ok{background:var(--tsoft)}.mc.ok b{color:#17695D}.mc.bad{background:var(--osoft)}.mc.bad b{color:var(--oink)}
/* pipeline / compare / flow / index */
.pipe{display:flex;align-items:flex-start;gap:6px;margin:20px 0 40px}
.pipe>div{flex:1;text-align:center}.pipe i{font-size:13px;color:var(--muted);display:block;margin-top:10px}
.chip{background:var(--panel);border-radius:12px;padding:18px 6px;min-height:170px;display:flex;flex-direction:column;align-items:center;gap:16px}
.chip .num{width:44px;height:44px;border-radius:50%;background:var(--orange);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700}
.chip b{font-family:var(--head);font-size:16px}.chip.hl{background:var(--navy);color:#fff}
.parr{color:var(--orange);font-size:22px;margin-top:70px}
.cmpw{display:flex;gap:16px;align-items:center;flex:1}
.cmp{flex:1;border-radius:14px;padding:26px;align-self:stretch}.cmp.l{background:var(--panel)}.cmp.r{background:var(--bsoft)}
.cmp h3{font-size:21px;margin-bottom:18px}.cmp.r h3{color:var(--blue)}
.carr{font-size:40px;color:var(--orange)}.cgap{width:10px}
.flow{display:flex;flex-direction:column;gap:4px}
.frow{display:flex;align-items:center;gap:12px}
.dia{background:var(--bsoft);border:2px solid var(--blue);border-radius:30px;padding:12px 18px;min-width:220px;text-align:center}
.dia code,.act code{color:var(--ink)}
.act{background:var(--tsoft);border:2px solid var(--teal);border-radius:8px;padding:10px 14px}
.act.else{background:var(--osoft);border-color:var(--orange);min-width:220px;text-align:center}
.tlab{font-weight:700;color:#17695D;font-size:14px}.tlab.o{color:var(--oink);font-style:italic}
.flab{color:var(--red);font-weight:700;font-size:14px;margin-left:90px}
.idx{display:flex;justify-content:center;align-items:center;margin:6px 0 24px;position:relative}
.ilab{position:absolute;left:0;top:0;bottom:0;display:flex;flex-direction:column;justify-content:space-between;font-size:13px;font-weight:700}.ilab .b{color:var(--blue)}.ilab .o{color:var(--oink)}
.ib{display:flex;flex-direction:column;align-items:center;width:200px}
.ip,.in{font-family:var(--mono);font-weight:700;font-size:20px}.ip{color:var(--blue)}.in{color:var(--oink)}
.ibox{border:1px solid var(--line);background:var(--panel);width:100%;padding:18px 4px;text-align:center}.ibox.on{background:var(--osoft);border:2px solid var(--orange)}
.hlab{color:var(--oink);font-weight:700;text-align:center;margin:-10px 0 0}
.ptr{width:100%}
/* notebook mock */
.nb{border:1px solid var(--line);border-radius:10px;padding:0 0 18px;box-shadow:0 4px 14px rgba(0,0,0,.12);background:#fff;color:var(--ink)}
.nbbar{background:var(--panel);padding:10px 16px;border-radius:10px 10px 0 0}
.nbmenu{padding:10px 16px 0;color:var(--muted);font-size:14px;white-space:pre}.nbtool{padding:6px 16px;color:var(--blue);font-weight:700;font-size:14px;white-space:pre}
.nbtext{padding:12px 16px 12px 80px}
.nbcell{display:flex;align-items:center;gap:10px;margin:8px 16px}.nbcell pre{flex:1;margin:0;background:var(--panel);border:1.5px solid var(--blue);padding:10px;font-family:var(--mono)}
.nbcell.empty pre{border-color:var(--line);background:#fff}.nbn{width:54px;font-family:var(--mono);color:var(--blue);text-align:right}
.nbout{margin:4px 16px 4px 80px;font-family:var(--mono)}.nb p{margin:6px 16px}
.sbtn{display:inline-block;background:var(--orange);color:var(--navy);font-weight:700;border-radius:8px;padding:10px 20px;margin:10px 16px 0}
.steps li{display:flex;gap:16px;margin-bottom:26px}.steps b{font-size:20px;color:var(--navy)}.steps p{margin:6px 0 0;font-size:16px}
.tasks li{display:flex;gap:14px;align-items:flex-start;font-size:19px;margin-bottom:26px}.tasks.light li{color:#D9DEE8}
.mdr{border:1px solid var(--line);border-radius:10px;padding:16px 22px;min-height:200px}.mdr p{margin:4px 0 10px}
.venn{width:100%;max-height:540px}.bigl{font-size:25px;font-weight:700;font-family:var(--head);color:var(--navy)}
.lane{display:flex;align-items:center;gap:14px;background:#F7F9FC;border:1px solid var(--line);border-radius:12px;padding:14px 20px;margin-bottom:14px}
.lane.warm{background:var(--warm);border-color:#F0D3B4}
.lk{width:290px;display:flex;flex-direction:column}.lk small{color:var(--blue);font-weight:700;letter-spacing:1px}.lane.warm .lk small{color:var(--oink)}.lk b{font-size:18px}
.lin{display:flex;flex-direction:column;gap:6px}.lp{background:var(--bsoft);border-radius:20px;padding:6px 16px;text-align:center}.lane.warm .lp{background:var(--osoft)}
.lp.out{font-weight:700}.larr{font-size:26px;color:var(--navy)}.lane.warm .larr{color:var(--oink)}
.lbox{background:var(--navy);color:#fff;font-weight:700;border-radius:8px;padding:16px 26px;font-family:var(--head)}.lane.warm .lbox{background:var(--orange);color:var(--navy)}
.barchart{background:#fff;padding:10px}.barchart h4{text-align:center;margin:0 0 10px;font-family:var(--head);color:var(--navy)}
.bars{display:flex;justify-content:center;align-items:flex-end;gap:60px;height:380px;border-bottom:2px solid var(--line)}
.bar{display:flex;flex-direction:column;align-items:center;width:140px}.bar div{width:100%;border-radius:4px 4px 0 0}.bv{font-weight:700;font-size:20px;margin-bottom:6px}.bl{font-size:18px;margin-top:8px;position:relative;top:34px}
.mh1{font-size:40px;margin:6px 0 30px}
/* footer */
.foot{position:absolute;left:0;right:0;bottom:0;height:32px;display:flex;font-size:12px;font-weight:700}
.foot span{display:flex;align-items:center;justify-content:center}
.f1{width:26%;background:var(--blue);color:#fff}.f2{width:39%;background:var(--orange);color:var(--navy)}.f3{width:24%;background:var(--blue);color:#fff}.f4{width:11%;background:var(--navy);color:#fff;border-left:1px solid #3B4D75}
/* nav */
#nav{position:fixed;right:14px;bottom:44px;display:flex;gap:6px;align-items:center;background:rgba(21,33,58,.85);border-radius:22px;padding:6px 10px;z-index:9;opacity:.35;transition:opacity .2s}
#nav:hover,#nav:focus-within{opacity:1}
#nav button,#nav a{background:none;border:0;color:#fff;font-size:17px;cursor:pointer;text-decoration:none;padding:2px 6px}
#count{color:#cfd8ea;font-size:13px;min-width:54px;text-align:center}
@media (max-width:700px){#nav{bottom:8px;opacity:.8}}
/* index page */
body.index{background:#F6F7FA;overflow:auto;height:auto}
body.index header{background:var(--navy);color:#fff;padding:40px 8vw 32px}
body.index header h1{font-size:clamp(26px,4vw,40px);margin:6px 0 8px}
body.index main{max-width:980px;margin:0 auto;padding:20px 5vw 60px}
body.index h2{font-size:21px;margin:30px 0 12px;color:var(--navy)}
.how{background:#fff;border:1px solid var(--line);border-radius:10px;padding:14px 18px;line-height:1.45}
.list{display:flex;flex-direction:column;gap:8px}
.lec{display:flex;gap:16px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:10px;padding:12px 16px;text-decoration:none;color:var(--ink)}
.lec:hover{border-color:var(--orange);box-shadow:0 2px 8px rgba(0,0,0,.08)}
.lnum{flex:none;width:92px;font-size:11px;color:var(--muted);display:flex;flex-direction:column;font-weight:700;text-transform:uppercase}.lnum b{font-size:22px;color:var(--orange);font-family:var(--head)}
.lt{flex:1;display:flex;flex-direction:column}.lt small{color:var(--muted);margin-top:3px}.ln{color:var(--muted);font-size:13px;flex:none}
.credit{font-size:13px;color:var(--muted);margin-top:22px;line-height:1.5}

/* interactive lab slide */
.labsl{display:grid;grid-template-columns:5fr 6fr;gap:34px;align-items:start;margin-top:8px}
.labsl ol{list-style:none;padding:0;margin:6px 0 0;counter-reset:l}
.labsl li{counter-increment:l;margin:0 0 14px;padding-left:34px;position:relative;font-size:17px;color:#5D6573}
.labsl li b{display:block;font-size:21px;color:#15213A}
.labsl li:before{content:counter(l);position:absolute;left:0;top:0;font-weight:800;font-size:22px;color:#E07A1F}
.labsl .shot{width:100%;border:1px solid #D5DBE5;border-radius:8px;box-shadow:0 4px 18px rgba(21,33,58,.12)}
.labgo{display:inline-block;margin-top:14px;background:#E07A1F;color:#15213A;font-weight:800;font-size:22px;padding:14px 30px;border-radius:10px;text-decoration:none}
.labgo:hover{filter:brightness(1.05)}
.labnote{font-size:13px;color:#5D6573;margin-top:8px}