/* Slide-deck layout. The palette and type tokens come from assets/theme.css,
   which this page links first; only rules specific to the slides live here. */

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  background:
    radial-gradient(1200px 800px at 78% -10%, var(--primary-soft), transparent 60%),
    radial-gradient(1000px 700px at 10% 110%, var(--secondary-soft), transparent 55%),
    var(--bg);
  color: var(--ink); font-family: var(--sans);
  -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; overflow: hidden;
}

.deck { position: fixed; inset: 0; }
.slide {
  position: absolute; inset: 0; display: grid; place-items: center;
  padding: clamp(18px, 4vh, 44px) clamp(20px, 5vw, 88px) clamp(58px, 8vh, 88px);
  opacity: 0; visibility: hidden; transform: translateY(14px);
  transition: opacity .4s ease, transform .4s ease, visibility 0s linear .4s;
}
.slide.active { opacity: 1; visibility: visible; transform: none; transition: opacity .48s ease, transform .48s ease; }
.inner { width: min(1100px, 100%); max-height: 100%; overflow-y: auto; scrollbar-width: thin; }
.inner::-webkit-scrollbar { width: 8px; }
.inner::-webkit-scrollbar-thumb { background: var(--line); border-radius: 8px; }

.eyebrow {
  font-family: var(--mono); font-size: clamp(10.5px, 1.3vw, 12.5px);
  letter-spacing: .2em; text-transform: uppercase; color: var(--faint);
  display: flex; align-items: center; gap: .8em; margin: 0 0 clamp(11px, 2vh, 20px); flex-wrap: wrap;
}
.eyebrow .num { color: var(--primary); font-weight: 600; }
.eyebrow .bar { flex: 0 0 30px; height: 2px; background: var(--primary); border-radius: 2px; }
h1, h2 { text-wrap: balance; margin: 0; font-weight: 680; letter-spacing: -0.02em; line-height: 1.06; }
h2 { font-size: clamp(24px, 3.9vw, 42px); }
.lede { font-size: clamp(14.5px, 1.85vw, 19px); line-height: 1.5; color: var(--muted); max-width: 68ch; margin: clamp(11px, 2vh, 18px) 0 0; }
.lede strong { color: var(--ink); font-weight: 600; }
p { line-height: 1.55; }
.amber { color: var(--primary); } .steel { color: var(--secondary); }
code, .mono { font-family: var(--mono); }

.grid { display: grid; gap: clamp(10px, 1.4vw, 16px); margin-top: clamp(16px, 2.6vh, 26px); }
.g2 { grid-template-columns: repeat(2, 1fr); }
.g3 { grid-template-columns: repeat(3, 1fr); }
.g4 { grid-template-columns: repeat(2, 1fr); }
@media (min-width: 820px) { .g4 { grid-template-columns: repeat(4, 1fr); } }
@media (max-width: 720px) { .g2, .g3 { grid-template-columns: 1fr; } }

.card { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: clamp(13px, 1.8vw, 20px); box-shadow: var(--shadow); }
.card h3 { margin: 0 0 .45em; font-size: clamp(14px, 1.6vw, 17px); letter-spacing: -.01em; font-weight: 650; }
.card p { margin: 0; color: var(--muted); font-size: clamp(12.5px, 1.4vw, 14.5px); line-height: 1.48; }
.card .tag { font-family: var(--mono); font-size: 10.5px; letter-spacing: .12em; text-transform: uppercase; color: var(--faint); display: block; margin-bottom: .6em; }
.card.guest { border-top: 3px solid var(--primary); }
.card.host  { border-top: 3px solid var(--secondary); }

ul.clean { list-style: none; margin: clamp(13px,2.2vh,20px) 0 0; padding: 0; display: grid; gap: 10px; grid-template-columns: max-content 1fr; }
ul.clean li { display: grid; grid-template-columns: auto 1fr; grid-column: 1 / -1; gap: .9em; align-items: baseline; font-size: clamp(13.5px, 1.6vw, 16.5px); line-height: 1.42; color: var(--ink); }
@supports (grid-template-columns: subgrid) { ul.clean li { grid-template-columns: subgrid; } }
ul.clean li b { font-weight: 640; }
ul.clean li span.k { font-family: var(--mono); color: var(--primary); font-size: .84em; white-space: nowrap; transform: translateY(-1px); }
ul.clean li .sub { color: var(--muted); }

.codeblock { font-family: var(--mono); background: var(--bg2); border: 1px solid var(--line); border-radius: 10px; padding: clamp(12px, 1.6vw, 18px); font-size: clamp(11px, 1.35vw, 14px); line-height: 1.62; overflow-x: auto; color: var(--ink); white-space: pre; margin-top: clamp(14px,2.4vh,22px); }
.codeblock .c { color: var(--faint); } .codeblock .a { color: var(--primary); } .codeblock .s { color: var(--secondary); }

.pill { display: inline-flex; align-items: center; gap: .5em; font-family: var(--mono); font-size: 12px; letter-spacing: .07em; padding: .32em .7em; border-radius: 999px; border: 1px solid var(--line); color: var(--muted); background: var(--surface); }
.dot { width: 8px; height: 8px; border-radius: 50%; display: inline-block; } .dot.a { background: var(--primary); } .dot.s { background: var(--secondary); }

/* Flow diagrams: never wrap mid-row — scroll horizontally instead. */
.flow { display: flex; flex-wrap: nowrap; align-items: stretch; gap: 9px; margin-top: clamp(14px,2.4vh,24px); overflow-x: auto; padding-bottom: 4px; scrollbar-width: thin; }
.flow .node { flex: 1 1 130px; min-width: 118px; background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; box-shadow: var(--shadow); }
.flow .node .t { font-family: var(--mono); font-size: 10.5px; letter-spacing: .07em; color: var(--faint); text-transform: uppercase; }
.flow .node .d { font-size: clamp(12px,1.4vw,14px); font-weight: 600; margin-top: 3px; line-height: 1.22; }
.flow .node .d small { display:block; font-weight: 400; color: var(--muted); font-size: .82em; margin-top: 2px; }
.flow .arrow { align-self: center; color: var(--faint); font-family: var(--mono); font-size: 17px; flex: 0 0 auto; }
.flow .node.g { border-left: 3px solid var(--primary); } .flow .node.h { border-left: 3px solid var(--secondary); }
.flow.stack { flex-direction: column; overflow-x: visible; gap: 6px; }
.flow.stack .node { flex: 0 0 auto; min-width: 0; }
.flow.stack .arrow { transform: rotate(90deg); align-self: flex-start; margin: 0 0 0 22px; line-height: 1; }

.timeline { margin-top: clamp(20px, 3.4vh, 36px); position: relative; }
.tl-track { position: absolute; left: 0; right: 0; top: 15px; height: 2px; background: linear-gradient(90deg, var(--primary), var(--secondary)); opacity: .55; border-radius: 2px; }
.tl-row { display: grid; grid-template-columns: repeat(5, 1fr); gap: clamp(8px, 1.4vw, 20px); position: relative; }
.tl-item .knob { width: 12px; height: 12px; border-radius: 50%; background: var(--surface); border: 2px solid var(--primary); position: relative; z-index: 1; margin-bottom: 15px; box-shadow: 0 0 0 4px var(--bg); }
.tl-item:nth-child(n+4) .knob { border-color: var(--secondary); }
.tl-item .yr { font-family: var(--mono); font-size: clamp(12px,1.5vw,15px); font-weight: 600; color: var(--ink); letter-spacing: .04em; }
.tl-item .lb { font-size: clamp(12px,1.4vw,14.5px); font-weight: 620; margin-top: 4px; }
.tl-item .ds { font-size: clamp(11px,1.25vw,13px); color: var(--muted); margin-top: 4px; line-height: 1.4; }
@media (max-width: 720px) { .tl-track { display: none; } .tl-row { grid-template-columns: 1fr; gap: 14px; } .tl-item { display: grid; grid-template-columns: auto 1fr; gap: 12px; align-items: start; } .tl-item .knob { margin: 4px 0 0; } }

.compare { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(10px,1.4vw,16px); margin-top: clamp(14px,2.6vh,24px); }
@media (max-width: 720px) { .compare { grid-template-columns: 1fr; } }
.compare .col { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: clamp(13px,1.8vw,20px); box-shadow: var(--shadow); }
.compare .col.g { border-top: 3px solid var(--primary); } .compare .col.h { border-top: 3px solid var(--secondary); }
.compare .col h3 { margin: 0 0 .3em; font-size: clamp(14.5px,1.75vw,18.5px); }
.compare .col .who { font-family: var(--mono); font-size: 11px; letter-spacing: .13em; text-transform: uppercase; }
.compare .col.g .who { color: var(--primary); } .compare .col.h .who { color: var(--secondary); }
.compare .col ul { margin: .8em 0 0; padding: 0; list-style: none; display: grid; gap: .55em; }
.compare .col li { display: grid; grid-template-columns: auto 1fr; gap: .7em; font-size: clamp(12px,1.4vw,14.5px); color: var(--muted); line-height: 1.38; }
.compare .col li::before { content: "›"; font-family: var(--mono); color: var(--faint); }
.compare .col li b { color: var(--ink); font-weight: 600; }

.scroll { overflow-x: auto; margin-top: clamp(14px,2.6vh,24px); border: 1px solid var(--line); border-radius: 12px; }
.dtable { width: 100%; border-collapse: collapse; font-size: clamp(12px,1.4vw,14.5px); background: var(--surface); }
.dtable th, .dtable td { text-align: left; padding: 9px 14px; border-bottom: 1px solid var(--line-soft); white-space: nowrap; }
.dtable td.wrap { white-space: normal; min-width: 26ch; }
.dtable thead th { font-family: var(--mono); font-size: 11px; letter-spacing: .1em; text-transform: uppercase; color: var(--faint); background: var(--bg2); }
.dtable tbody tr:last-child td { border-bottom: none; }
.dtable td.m { font-family: var(--mono); }
.dtable td:first-child { color: var(--ink); font-weight: 600; }

.stats { display: flex; gap: clamp(14px,2.5vw,34px); flex-wrap: wrap; margin-top: clamp(16px,2.8vh,28px); }
.stat .n { font-family: var(--mono); font-size: clamp(26px,4.6vw,48px); font-weight: 700; color: var(--primary); line-height: 1; letter-spacing: -.02em; }
.stat.s .n { color: var(--secondary); }
.stat .l { color: var(--muted); font-size: clamp(12px,1.4vw,14.5px); margin-top: 8px; max-width: 24ch; line-height: 1.4; }

/* Audience-question callout */
.qa { display: grid; grid-template-columns: auto 1fr; gap: 12px; align-items: start;
      background: var(--secondary-soft); border: 1px solid var(--line); border-left: 3px solid var(--secondary);
      border-radius: 10px; padding: 12px 15px; margin-top: clamp(14px,2.4vh,20px); }
.qa .qm { font-family: var(--mono); font-weight: 700; color: var(--secondary); font-size: 15px; line-height: 1.3; }
.qa .qt { font-weight: 640; font-size: clamp(13px,1.5vw,15.5px); line-height: 1.35; }
.qa .ans { color: var(--muted); font-size: clamp(12.5px,1.4vw,14.5px); line-height: 1.5; margin-top: 5px; }
.qa .ans b { color: var(--ink); font-weight: 600; }

/* Bit-field diagram (proportional cells) */
.bfwrap { overflow-x: auto; margin-top: clamp(14px,2.4vh,20px); }
.bf { display: flex; font-family: var(--mono); border: 1px solid var(--line); border-radius: 8px; overflow: hidden; min-width: 620px; }
.bf .c { padding: 7px 4px; text-align: center; border-right: 1px solid var(--line-soft); background: var(--surface); min-width: 0; }
.bf .c:last-child { border-right: none; }
.bf .c .b { font-size: 9.5px; color: var(--faint); letter-spacing: .02em; }
.bf .c .v { font-weight: 600; font-size: clamp(11px,1.3vw,13.5px); margin-top: 2px; }
.bf .c .f { font-size: 10px; color: var(--muted); margin-top: 2px; }
.bf .c.hi { background: var(--primary-soft); } .bf .c.hi .v { color: var(--primary); }
.bf .c.hs { background: var(--secondary-soft); } .bf .c.hs .v { color: var(--secondary); }

/* Register-width bars */
.rbar { font-family: var(--mono); font-size: clamp(11px,1.3vw,13.5px); display: grid; gap: 6px; margin-top: 14px; }
.rbar .row { display: grid; grid-template-columns: 3.2em 1fr; gap: 10px; align-items: center; }
.rbar .bar { height: 20px; border-radius: 4px; border: 1px solid var(--line); background: var(--bg2); position: relative; overflow: hidden; }
.rbar .fill { position: absolute; right: 0; top: 0; bottom: 0; border-radius: 3px; }
.rbar .fill.a { background: var(--primary); opacity: .75; } .rbar .fill.s { background: var(--secondary); opacity: .7; }

/* Inline SVG diagrams */
.svgd { width: 100%; height: auto; display: block; margin-top: clamp(14px,2.6vh,24px); }
.svgd .box { fill: var(--surface); stroke: var(--line); stroke-width: 1; rx: 8; }
.svgd .box.g { stroke: var(--primary); stroke-width: 1.6; }
.svgd .box.h { stroke: var(--secondary); stroke-width: 1.6; }
.svgd .box.soft { fill: var(--bg2); }
.svgd text { fill: var(--ink); font-family: var(--sans); font-size: 14px; }
.svgd text.ttl { font-weight: 650; }
.svgd text.sm { font-size: 11.5px; fill: var(--muted); }
.svgd text.mono { font-family: var(--mono); font-size: 12px; }
.svgd text.lbl { font-family: var(--mono); font-size: 10.5px; fill: var(--faint); letter-spacing: .08em; }
.svgd text.am { fill: var(--primary); } .svgd text.st { fill: var(--secondary); }
.svgd .edge { stroke: var(--faint); stroke-width: 1.4; fill: none; }
.svgd .edge.a { stroke: var(--primary); } .svgd .edge.s { stroke: var(--secondary); }

.title-wrap { text-align: left; }
.title-kicker { font-family: var(--mono); letter-spacing: .28em; text-transform: uppercase; font-size: clamp(11px,1.5vw,14px); color: var(--primary); }
.title-wrap h1 { font-size: clamp(38px, 7vw, 82px); margin: clamp(16px,3vh,26px) 0 0; letter-spacing: -.03em; }
.title-wrap h1 .sub2 { color: var(--muted); }
.arrow-glyph { color: var(--secondary); }
.title-meta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: clamp(24px,4vh,38px); }

.rail { position: fixed; left: 0; top: 0; height: 3px; background: var(--primary); width: 0; z-index: 40; transition: width .4s ease; }
.hud { position: fixed; left: 0; right: 0; bottom: 0; z-index: 30; display: flex; align-items: center; justify-content: space-between; padding: 11px clamp(16px, 4vw, 40px); font-family: var(--mono); font-size: 12px; color: var(--faint); pointer-events: none; }
.hud .left { display: flex; align-items: center; gap: 14px; letter-spacing: .05em; }
.hud .counter { color: var(--muted); pointer-events: auto; cursor: pointer; font: inherit; letter-spacing: inherit; background: none; border: 1px solid transparent; border-radius: 8px; padding: 5px 8px; transition: border-color .15s, color .15s; }
.hud .counter b { color: var(--ink); font-weight: 600; }
.hud .counter:hover { color: var(--ink); border-color: var(--primary); }
.hud .counter:focus-visible { outline: 2px solid var(--secondary); outline-offset: 2px; }
.hud .doc { letter-spacing: .1em; text-transform: uppercase; opacity: .8; }
.hud .part { color: var(--primary); letter-spacing: .12em; text-transform: uppercase; }
.controls { display: flex; align-items: center; gap: 8px; pointer-events: auto; }
.btn { font-family: var(--mono); font-size: 13px; color: var(--muted); background: var(--surface); border: 1px solid var(--line); border-radius: 8px; padding: 7px 11px; cursor: pointer; line-height: 1; transition: border-color .15s, color .15s; }
.btn:hover { color: var(--ink); border-color: var(--primary); }
.btn:focus-visible { outline: 2px solid var(--secondary); outline-offset: 2px; }
.hint { position: fixed; right: clamp(16px,4vw,40px); top: 15px; z-index: 30; font-family: var(--mono); font-size: 11px; letter-spacing: .1em; color: var(--faint); text-transform: uppercase; opacity: 0; animation: fade 1s ease .4s forwards; pointer-events: none; }

/* Contents overlay: jump to any slide. Solid page background (no translucency)
   so it reads cleanly over whatever slide is behind it, in both themes. */
.toc { position: fixed; inset: 0; z-index: 60; display: flex; flex-direction: column; background: var(--bg); padding: clamp(16px, 3.5vh, 32px) clamp(20px, 5vw, 64px); }
.toc[hidden] { display: none; }
.toc-head { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.toc-title { font-family: var(--mono); font-size: 13px; font-weight: 600; letter-spacing: .2em; text-transform: uppercase; color: var(--primary); }
.toc-hint { font-family: var(--mono); font-size: 11px; letter-spacing: .08em; color: var(--faint); flex: 1; min-width: 180px; }
.toc-jump { width: 76px; font-family: var(--mono); font-size: 13px; color: var(--ink); background: var(--surface); border: 1px solid var(--line); border-radius: 8px; padding: 7px 9px; }
.toc-jump:focus-visible { outline: 2px solid var(--secondary); outline-offset: 2px; }
.toc-body { margin-top: clamp(12px, 2.2vh, 20px); overflow-y: auto; scrollbar-width: thin; column-width: 250px; column-gap: 30px; }
.toc-part { break-inside: avoid; margin: 0 0 14px; }
.toc-part h3 { font-family: var(--mono); font-size: 10.5px; font-weight: 600; letter-spacing: .14em; text-transform: uppercase; color: var(--faint); margin: 0 0 5px; }
.toc-part a { display: flex; gap: .6em; align-items: baseline; padding: 2.5px 7px; border-radius: 6px; color: var(--muted); text-decoration: none; font-size: 12.5px; line-height: 1.32; }
.toc-part a:hover { color: var(--ink); background: var(--surface); }
.toc-part a:focus-visible { outline: 2px solid var(--secondary); outline-offset: 1px; }
.toc-part a .n { font-family: var(--mono); color: var(--primary); font-size: .85em; min-width: 2.2em; text-align: right; flex: 0 0 auto; }
.toc-part a.cur { color: var(--ink); background: var(--surface); box-shadow: inset 2px 0 0 var(--primary); }
@keyframes fade { to { opacity: .7; } }
@media (prefers-reduced-motion: reduce) { .slide { transition: opacity .01s, visibility 0s; transform: none; } .rail { transition: none; } .hint { animation: none; opacity: .6; } }

/* Row-aligned two-column comparison: each guest/host pair shares a grid row */
.pairgrid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: clamp(14px,2.6vh,24px); }
@media (max-width: 720px) { .pairgrid { grid-template-columns: 1fr; } }
.pairgrid .ph { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 12px 15px; box-shadow: var(--shadow); }
.pairgrid .ph .who { font-family: var(--mono); font-size: 11px; letter-spacing: .13em; text-transform: uppercase; }
.pairgrid .ph h3 { margin: .25em 0 0; font-size: clamp(14.5px,1.75vw,18.5px); }
.pairgrid .ph.g { border-top: 3px solid var(--primary); } .pairgrid .ph.g .who { color: var(--primary); }
.pairgrid .ph.h { border-top: 3px solid var(--secondary); } .pairgrid .ph.h .who { color: var(--secondary); }
.pairgrid .pc { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 10px 14px; font-size: clamp(12px,1.4vw,14.5px); color: var(--muted); line-height: 1.42; }
.pairgrid .pc b { color: var(--ink); font-weight: 600; }
.pairgrid .pc.g { border-left: 3px solid var(--primary); } .pairgrid .pc.h { border-left: 3px solid var(--secondary); }

.foot-note { margin-top: clamp(12px,2.2vh,18px); font-size: clamp(11px,1.3vw,13px); color: var(--faint); font-style: italic; max-width: 74ch; line-height: 1.45; }
.part-hero { text-align: left; }
.part-hero .pk { font-family: var(--mono); letter-spacing: .3em; text-transform: uppercase; font-size: clamp(12px,1.6vw,15px); color: var(--primary); }
.part-hero h2 { font-size: clamp(34px,6vw,64px); margin-top: clamp(10px,2vh,18px); }
.part-hero .pl { margin-top: clamp(14px,2.4vh,22px); }
.part-hero ul.clean { margin-top: clamp(18px,3vh,28px); max-width: 62ch; }

/* Further-reading slide. Covers are fetched from Amazon by ISBN, the only
   remote requests this deck makes; referrerpolicy keeps the referring URL
   out of them and loading=lazy keeps them off the critical path. */
/* Each book is one row — cover, then name + author, then the one-line "why" —
   with the three columns aligned down the list. Three list columns on wide
   screens (four book rows, so the slide fits without a vertical scrollbar),
   two on medium, one on narrow. Cover height tracks the viewport so the rows
   compress on short windows instead of overflowing. */
.inner-wide { width: min(1380px, 100%); }
.books { display: grid; grid-template-columns: repeat(3, 1fr); gap: min(10px, 1.2vh) 30px; margin-top: min(18px, 2.2vh); }
@media (max-width: 1150px) { .books { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 760px) { .books { grid-template-columns: 1fr; } }
.book { --cover-h: clamp(104px, 14.5vh, 180px); display: grid; grid-template-columns: calc(var(--cover-h) / 1.5) minmax(0, 5fr) minmax(0, 7fr); gap: 13px; align-items: center; }
.books .foot-note { margin-top: 0; align-self: center; }
.book a { color: inherit; text-decoration: none; display: block; }
.book img { width: calc(var(--cover-h) / 1.5); height: var(--cover-h); object-fit: cover; display: block; background: var(--bg2); border: 1px solid var(--line); border-radius: 5px; box-shadow: var(--shadow); }
.book .bt { font-weight: 600; font-size: .82rem; line-height: 1.25; }
.book a.bt:hover, .book a.bc:hover + .bmeta .bt { color: var(--primary); }
.book .ba { color: var(--muted); font-size: .74rem; margin-top: 2px; }
.book .bw { color: var(--faint); font-size: .73rem; line-height: 1.35; }
.foot-note { margin-top: 22px; color: var(--muted); font-size: .82rem; }