/* ============================================================
   deck.css — a fixed-stage HTML slide engine
   Stage is always 1920x1080; deck.js scales it to fit the window.
   Design in absolute px and it looks identical on every screen.
   ============================================================ */

/* ---------- theme tokens: edit these, not the rules below ---------- */
:root{
  --canvas:#f7f5f1;          /* slide background */
  --ink:#15181d;             /* primary text */
  --ink-2:#2f3a44;           /* secondary heading text */
  --muted:#5c6672;           /* body copy */
  --faint:#96a0ab;           /* captions, meta */

  --accent:#1f6f68;          /* primary accent */
  --accent-soft:rgba(31,111,104,.72);
  --accent-faint:rgba(31,111,104,.12);
  --accent-2:#b4531f;        /* secondary accent / warnings */
  --accent-3:#2c5f9e;        /* tertiary accent / data */

  --hair:rgba(21,24,29,.14);
  --hair-soft:rgba(21,24,29,.07);
  --card:rgba(255,255,255,.72);
  --card-solid:#fff;
  --dark:#12161b;
  --dark-edge:#242c35;

  --good:#0f7a3d;
  --bad:#bc2626;

  --grad:linear-gradient(135deg,#15181d 0%,#2f3a44 35%,#1f6f68 62%,#15181d 100%);
  --shadow:0 22px 70px -44px rgba(21,24,29,.42);
  --shadow-raised:0 28px 80px -46px rgba(21,24,29,.55);

  --serif:"Playfair Display",Georgia,serif;
  --sans:Inter,system-ui,-apple-system,sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
}

*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{background:#e9e6e0;font-family:var(--sans);color:var(--ink);overflow:hidden;
     -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}

/* ---------- stage scaling ---------- */
#viewport{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;
          transition:right .3s cubic-bezier(.16,1,.3,1),bottom .3s cubic-bezier(.16,1,.3,1)}
#stage{width:1920px;height:1080px;position:relative;flex:none;transform-origin:center center}

/* ---------- slide base ---------- */
.slide{position:absolute;inset:0;
  background:
    radial-gradient(circle at 88% 12%,var(--accent-faint),transparent 28%),
    radial-gradient(circle at 8% 90%,rgba(44,95,158,.08),transparent 30%),
    var(--canvas);
  padding:92px 116px 108px;
  display:none;flex-direction:column;align-items:stretch}
.slide.active{display:flex}
.slide .notes,.slide .sources{display:none}
.slide.active h1{animation:reveal .6s cubic-bezier(.16,1,.3,1) both}
@keyframes reveal{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:none}}
.slide.active .body>*{animation:rise .55s cubic-bezier(.16,1,.3,1) both;animation-delay:.12s}
@keyframes rise{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:none}}

/* ---------- header ---------- */
.kicker{display:flex;align-items:center;gap:14px;font:600 16px/1 var(--sans);
        letter-spacing:.34em;text-transform:uppercase;color:var(--accent-soft);margin-bottom:26px}
.kicker .km{display:grid;grid-template-columns:8px 8px;gap:3px;flex:none}
.kicker .km i{width:8px;height:8px;border-radius:2px;background:var(--accent-faint)}
.kicker .km i:nth-child(2){background:var(--accent)}
h1.t{font:600 62px/1.14 var(--serif);color:var(--ink);letter-spacing:-.005em;max-width:1480px}
h1.t.sm{font-size:50px}
.sub{font:400 26px/1.5 var(--sans);color:var(--muted);margin-top:18px;max-width:1280px}
.sub strong{color:var(--ink);font-weight:600}
.grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}

/* ---------- layout helpers ---------- */
.body{flex:1;display:flex;flex-direction:column;justify-content:center;min-height:0;margin-top:44px}
.cols{display:flex;gap:44px;align-items:stretch;min-height:0}
.cols.top{align-items:flex-start}
.grow{flex:1;min-width:0}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:32px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.stack{display:flex;flex-direction:column;gap:22px}
.center{align-items:center;justify-content:center;text-align:center}

/* ---------- cards ---------- */
.card{background:var(--card);border:1px solid var(--hair-soft);border-radius:18px;padding:34px 38px}
.card.solid{background:var(--card-solid);box-shadow:var(--shadow)}
.card.dark{background:var(--dark);border-color:var(--dark-edge);color:#e9edf2}
.card.dark h3,.card.dark .num{color:#fff}
.card.dark p{color:#a8b3c0}
.card.accent{border-color:var(--accent-faint);background:var(--accent-faint)}
/* cards on a dark section slide: glassy, not light-grey blocks
   (.card's default fill is tuned for the light canvas and goes muddy here) */
.slide.section .card{background:rgba(255,255,255,.055);border-color:rgba(255,255,255,.15)}
.slide.section .card h3{color:#fff}
.slide.section .card p{color:#b9c4d0}
.slide.section .card .cap{color:#8695a3}
.slide.section .card .num{color:var(--accent)}
.slide.section .card.dark{background:rgba(0,0,0,.32)}
.slide.section .card.accent{background:rgba(63,190,178,.10);border-color:rgba(63,190,178,.35)}
.card h3{font:600 26px/1.3 var(--sans);color:var(--ink-2);margin-bottom:12px}
.card p{font:400 21px/1.55 var(--sans);color:var(--muted)}
.card .num{font:700 64px/1 var(--serif);color:var(--accent);display:block;margin-bottom:10px}
.card .cap{font:500 15px/1.4 var(--sans);letter-spacing:.16em;text-transform:uppercase;color:var(--faint);margin-top:14px}

/* ---------- bits ---------- */
ul.bullets{list-style:none;display:flex;flex-direction:column;gap:20px}
ul.bullets li{position:relative;padding-left:36px;font:400 25px/1.5 var(--sans);color:var(--muted)}
ul.bullets li::before{content:"";position:absolute;left:0;top:13px;width:12px;height:12px;
                      border-radius:3px;background:var(--accent)}
ul.bullets li strong{color:var(--ink);font-weight:600}
.chip{display:inline-flex;align-items:center;gap:8px;padding:8px 16px;border-radius:999px;
      border:1px solid var(--hair);font:500 17px/1 var(--sans);color:var(--ink-2);background:var(--card)}
.chip.on{border-color:var(--accent);color:var(--accent);background:var(--accent-faint)}
.chips{display:flex;flex-wrap:wrap;gap:12px}
pre.code{background:var(--dark);color:#dbe4ee;border-radius:16px;padding:30px 34px;
         font:400 21px/1.6 var(--mono);overflow:hidden;white-space:pre-wrap}
pre.code .c{color:#7a8899}
pre.code .k{color:#7fd1c6}
pre.code .s{color:#e0b072}
/* links on a slide — never leave these to browser defaults */
.slide a{color:var(--accent);text-decoration:underline;
         text-decoration-color:var(--accent-faint);text-decoration-thickness:1.5px;
         text-underline-offset:3px}
.slide a:hover{text-decoration-color:var(--accent)}
.slide figcaption a,.slide .derived a{color:inherit;text-decoration-color:var(--hair)}
.slide figcaption a:hover,.slide .derived a:hover{color:var(--accent)}
.slide.section a,.card.dark a{color:#8fd8ce;text-decoration-color:rgba(143,216,206,.4)}

figure{display:flex;flex-direction:column;gap:14px;min-height:0}
figure img{max-width:100%;max-height:100%;object-fit:contain;border-radius:14px;
           flex:1 1 auto;min-height:0}   /* min-height:0 is load-bearing: without it an
              image in a flex column overflows as soon as a <figcaption> shares the box */
figure img.zoom{cursor:zoom-in}
figcaption{font:400 17px/1.45 var(--sans);color:var(--faint)}
.quote{font:600 italic 44px/1.34 var(--serif);color:var(--ink);max-width:1400px}
.quote+.by{font:500 20px/1 var(--sans);letter-spacing:.14em;text-transform:uppercase;
           color:var(--faint);margin-top:32px}

/* placeholder marker — real numbers still to come from the source deck */
.todo{border-bottom:2px dotted var(--accent-2);color:var(--accent-2);font-weight:500}
.draft-flag{position:absolute;top:34px;right:116px;font:600 11px/1 var(--sans);letter-spacing:.2em;
            text-transform:uppercase;color:var(--accent-2);border:1px solid var(--accent-2);
            border-radius:999px;padding:7px 13px}
.slide.section .draft-flag{color:#e0a06a;border-color:#e0a06a}

/* ---------- special slide kinds ---------- */
.title-slide{justify-content:center;padding:120px}
.title-slide h1{font:700 104px/1.06 var(--serif);letter-spacing:-.02em;max-width:1500px}
.title-slide .sub{font-size:32px;margin-top:30px}
.title-slide .meta{margin-top:auto;display:flex;gap:40px;font:500 19px/1 var(--sans);
                   letter-spacing:.12em;text-transform:uppercase;color:var(--faint)}
.slide.section{justify-content:center;background:var(--dark)}
.slide.section h1{font:700 88px/1.1 var(--serif);color:#fff;max-width:1400px}
.slide.section .sub{color:#98a4b2;font-size:29px}
.slide.section .kicker{color:rgba(255,255,255,.5)}
.slide.section .kicker .km i{background:rgba(255,255,255,.25)}
.slide.section .kicker .km i:nth-child(2){background:#fff}
.closing-slide{justify-content:center}
.closing-slide h1{font:700 76px/1.1 var(--serif)}

/* ---------- per-slide footer ---------- */
.slide-number{position:absolute;right:116px;bottom:52px;font:500 17px/1 var(--mono);color:var(--faint)}
.slide-foot{position:absolute;left:116px;bottom:52px;font:500 15px/1 var(--sans);
            letter-spacing:.18em;text-transform:uppercase;color:var(--faint)}
.slide.section .slide-number,.slide.section .slide-foot{color:rgba(255,255,255,.4)}

/* ---------- HUD ---------- */
#progress{position:fixed;left:0;top:0;height:3px;width:100%;background:var(--accent);
          transform-origin:left;transform:scaleX(0);transition:transform .35s cubic-bezier(.16,1,.3,1);z-index:40}
#hud{position:fixed;right:22px;bottom:18px;display:flex;align-items:center;gap:10px;z-index:41;
     font:500 14px/1 var(--sans);color:#5c6672;opacity:.32;transition:opacity .25s}
#hud:hover,body.hud-show #hud{opacity:1}
#hud button{all:unset;cursor:pointer;width:32px;height:32px;display:grid;place-items:center;
            border-radius:9px;background:rgba(255,255,255,.8);border:1px solid var(--hair-soft);
            color:var(--ink-2);font-size:15px}
#hud button:disabled{opacity:.3;cursor:default}
#hud button:hover:not(:disabled){background:#fff;color:var(--accent)}
#hud button{position:relative}
#hud .badge{position:absolute;top:-4px;right:-4px;min-width:15px;height:15px;border-radius:8px;
            background:var(--accent);color:#fff;font:600 10px/15px var(--sans);text-align:center;
            padding:0 3px}
#hud .dd-flag{font:600 10px/1 var(--sans);letter-spacing:.16em;text-transform:uppercase;
              color:var(--accent-2);border:1px solid var(--accent-2);border-radius:999px;
              padding:6px 10px;background:rgba(255,255,255,.8)}
#ctr{font-family:var(--mono);padding:0 6px;min-width:70px;text-align:center}

/* ---------- drawers (notes / contents) ---------- */
.drawer{position:fixed;top:0;right:0;bottom:0;width:480px;background:#fff;z-index:50;
        border-left:1px solid var(--hair);padding:40px 38px;overflow-y:auto;
        transform:translateX(100%);transition:transform .3s cubic-bezier(.16,1,.3,1)}
#toc{width:440px}
body.notes-open #notes,body.toc-open #toc{transform:none}
.drawer .tk{font:600 13px/1 var(--sans);letter-spacing:.3em;text-transform:uppercase;
            color:var(--accent-soft);margin-bottom:14px}
.drawer h2{font:600 30px/1.2 var(--serif);margin-bottom:8px}
.drawer .nt{font:600 21px/1.35 var(--sans);color:var(--ink-2);margin:22px 0 12px}
.drawer .nb{font:400 18px/1.65 var(--sans);color:var(--muted);white-space:pre-wrap}
.drawer-close{all:unset;cursor:pointer;position:absolute;top:22px;right:24px;font-size:26px;
              line-height:1;color:var(--faint)}
.drawer-close:hover{color:var(--ink)}
.toc-section{border-bottom:1px solid var(--hair-soft);padding:6px 0}
.toc-section summary{cursor:pointer;list-style:none;padding:12px 0;font:600 18px/1.3 var(--sans)}
.toc-section summary::-webkit-details-marker{display:none}
.toc-section .section-range{display:block;font:500 13px/1 var(--mono);color:var(--faint);margin-top:6px}
.toc-section.current summary{color:var(--accent)}
.toc-list{display:flex;flex-direction:column;gap:2px;padding:4px 0 14px}
.toc-list .row{all:unset;cursor:pointer;display:flex;gap:14px;padding:9px 10px;border-radius:8px;
               font:400 16px/1.35 var(--sans);color:var(--muted)}
.toc-list .row:hover{background:var(--accent-faint);color:var(--ink)}
.toc-list .row.cur{background:var(--accent-faint);color:var(--accent);font-weight:600}
.toc-list .row .n{font-family:var(--mono);font-size:13px;color:var(--faint);min-width:26px}

/* sources drawer */
#sources{width:460px}
#sources .rt{font:600 21px/1.35 var(--sans);color:var(--ink-2);margin:22px 0 6px}
#sources .rc{font:500 12px/1.5 var(--mono);letter-spacing:.05em;color:var(--faint);
             text-transform:uppercase;margin-bottom:20px}
#sources .refs{list-style:none;display:flex;flex-direction:column;gap:2px}
#sources .refs li{border-bottom:1px solid var(--hair-soft);padding:15px 0}
#sources .refs li:last-child{border-bottom:0}
#sources .refs a{font:400 16px/1.5 var(--sans);color:var(--ink);text-decoration:none;
                 display:flex;gap:10px;align-items:baseline}
#sources .refs a::before{content:"↗";color:var(--accent);font-size:12px;flex:none}
#sources .refs a:hover{color:var(--accent);text-decoration:underline}
#sources .refs li:not(:has(a)){font:400 16px/1.5 var(--sans);color:var(--muted)}

/* attribution strip on a derived deck */
.derived{position:absolute;left:116px;bottom:52px;font:400 14px/1.4 var(--sans);color:var(--faint);
         max-width:900px}
.derived a{color:var(--accent-soft)}
.slide.section .derived{color:rgba(255,255,255,.45)}

/* ---------- lightbox ---------- */
#lightbox{position:fixed;inset:0;background:rgba(12,14,18,.92);z-index:60;display:none;
          align-items:center;justify-content:center;padding:60px;cursor:zoom-out}
#lightbox.open{display:flex}
#lightbox img{max-width:100%;max-height:100%;border-radius:10px}

/* ---------- dark mode ---------- */
:root[data-theme="dark"]{
  --canvas:#101418;--ink:#eef2f6;--ink-2:#cdd6e0;--muted:#9fabb8;--faint:#6b7883;
  --hair:rgba(255,255,255,.16);--hair-soft:rgba(255,255,255,.08);
  --card:rgba(255,255,255,.05);--card-solid:#171d23;--dark:#070a0d;--dark-edge:#1e262e;
  --accent-faint:rgba(63,190,178,.14);--accent:#3fbeb2;--accent-soft:rgba(63,190,178,.8);
}
:root[data-theme="dark"] body{background:#080b0e}
:root[data-theme="dark"] #hud button{background:rgba(255,255,255,.07);color:#cdd6e0}
:root[data-theme="dark"] .drawer{background:#141a20}
:root[data-theme="dark"] #hud .dd-flag{background:rgba(255,255,255,.07)}

/* ---------- print / export to PDF ---------- */
@media print{
  @page{size:1920px 1080px;margin:0}
  body{overflow:visible;background:#fff}
  #viewport{position:static;display:block}
  #stage{transform:none!important;width:1920px;height:auto}
  #hud,#progress,.drawer,#lightbox{display:none!important}
  .slide .sources{display:none!important}
  .slide{position:relative;display:flex!important;page-break-after:always;
         width:1920px;height:1080px;animation:none!important}
  .slide *{animation:none!important}
}

/* ============================================================
   ANIMATION KIT
   Two ideas, both pure CSS, both gated on .slide.active so they
   replay every time you land on the slide.

   1. Ambient loops — infinite, slow, decorative. Negative
      animation-delay desynchronises siblings without a wait.
   2. Delay ladders — one diagram revealed in stages, so the
      audience reads it in the order you explain it.

   Shared easing: cubic-bezier(.16,1,.3,1) — a hard ease-out.
   ============================================================ */

/* ---------- 1 · animated title ---------- */
.title-slide h1 .word{display:inline-block;margin-right:.28em}
.title-slide.active h1{animation:none}
.title-slide.active h1 .word{animation:wordIn .82s cubic-bezier(.16,1,.3,1) both}
.title-slide.active h1 .word:nth-child(2){animation-delay:.09s}
.title-slide.active h1 .word:nth-child(3){animation-delay:.18s}
.title-slide.active h1 .word.accent{color:var(--accent)}
@keyframes wordIn{from{opacity:0;transform:translate3d(-30px,22px,0)}
                  to{opacity:1;transform:translate3d(0,0,0)}}
.title-slide.active .sub{animation:riseIn .7s .34s cubic-bezier(.16,1,.3,1) both}
.title-slide.active .meta{animation:riseIn .7s .46s cubic-bezier(.16,1,.3,1) both}
@keyframes riseIn{from{opacity:0;transform:translate3d(0,18px,0)}
                  to{opacity:1;transform:translate3d(0,0,0)}}

/* ---------- 1b · title scene: text column + decoration column ---------- */
/* No absolute positioning — the decoration gets its own column so it can
   never sit on top of the headline. */
.title-slide .scene{flex:1;display:flex;align-items:center;gap:56px;min-height:0}
.title-slide .lockup{flex:1;min-width:0;display:flex;flex-direction:column;justify-content:center}
.title-slide .scene h1{font-size:88px;max-width:none}
.title-slide .scene .sub{margin-top:24px}

.signal{flex:0 0 520px;height:520px;position:relative;pointer-events:none}
.signal svg{position:absolute;inset:0;width:100%;height:100%;overflow:visible}
.signal svg path{fill:none;stroke:var(--accent);stroke-width:2.5;stroke-linecap:round;
                 stroke-dasharray:10 22;opacity:.5}
.title-slide.active .signal svg path{animation:trace 3.8s linear infinite}
.title-slide.active .signal svg path.slow{animation-delay:-1.8s;opacity:.28}
@keyframes trace{to{stroke-dashoffset:-64}}
.signal .dots{position:absolute;top:18%;bottom:18%;right:4%;width:46%;
              display:grid;grid-template-columns:repeat(5,1fr);grid-auto-rows:1fr;
              gap:14px;transform:rotate(-5deg)}
.signal .dots i{border-radius:5px;background:var(--accent);opacity:.16;min-height:12px}
.signal .dots i:nth-child(3n){opacity:.32}
.signal .dots i:nth-child(7n){opacity:.48}
.title-slide.active .signal .dots{animation:drift 8s cubic-bezier(.16,1,.3,1) infinite}
@keyframes drift{0%,100%{transform:rotate(-5deg) translate3d(0,0,0)}
                 50%{transform:rotate(-3.5deg) translate3d(0,-14px,0)}}

/* ---------- 2 · staged pipeline ---------- */
/* ONE grid, two rows. Because both lanes are rows of the same grid, every
   stage shares a column and therefore lines up, even though the query lane
   has 4 tokens and the document lane has 6. */
.pipe{display:grid;grid-template-columns:repeat(11,max-content) auto;
      align-items:center;gap:24px 18px;justify-content:start}
.slide.active .body>.pipe{animation:none}   /* don't double-animate with .body>* */

.pipe-box{background:var(--card);border:1px solid var(--hair-soft);border-radius:13px;
          padding:14px 18px;display:flex;flex-direction:column;gap:3px}
.pipe-box small{font:500 11px/1 var(--sans);letter-spacing:.16em;text-transform:uppercase;
                color:var(--faint)}
.pipe-box strong{font:600 22px/1.1 var(--mono);color:var(--ink)}
.pipe-tokens{display:flex;gap:8px}
.pipe-tok{font:500 16px/1 var(--mono);color:var(--accent);background:var(--accent-faint);
          border:1px solid var(--accent-faint);border-radius:8px;padding:11px 12px}
.pipe-enc{font:600 17px/1 var(--sans);color:#e9edf2;background:var(--dark);
          border-radius:10px;padding:16px 20px;white-space:nowrap}
.pipe-vecs{display:flex;gap:7px}
.pipe-vec{display:flex;flex-direction:column;gap:3px}
.pipe-vec i{width:24px;height:7px;border-radius:3px;background:var(--accent);opacity:.4}
.pipe-vec.one i{opacity:1;width:32px}
.pipe-arrow{width:30px;height:2px;background:var(--hair);position:relative;justify-self:center}
.pipe-arrow::after{content:"";position:absolute;right:-1px;top:-4px;width:0;height:0;
                   border-left:7px solid var(--hair);border-top:5px solid transparent;
                   border-bottom:5px solid transparent}
.pipe-arrow i{position:absolute;left:0;top:-3px;width:8px;height:8px;border-radius:50%;
              background:var(--accent);opacity:0}
.pipe-pool{font:600 14px/1 var(--sans);letter-spacing:.1em;text-transform:uppercase;
           color:var(--accent-2);border:1px dashed var(--accent-2);border-radius:10px;
           padding:14px 15px;white-space:nowrap}

/* the score: column 12, spanning both lanes, because it comes from both */
.pipe-out{grid-column:12;grid-row:1 / span 2;display:flex;align-items:center;gap:16px;
          margin-left:24px;align-self:stretch}
.pipe-out .rail{width:3px;align-self:stretch;background:var(--accent);border-radius:2px;
                transform-origin:center}
.pipe-out .val{font:600 21px/1.25 var(--sans);color:var(--ink)}
.pipe-out .val small{display:block;font:500 12px/1.6 var(--mono);color:var(--faint);
                     letter-spacing:.08em;text-transform:uppercase}

/* delay ladder — each stage lands after the one you just explained */
.slide.active .pipe-arrow i{animation:dash .72s var(--d,.08s) cubic-bezier(.16,1,.3,1) both}
.slide.active .pipe-tokens{animation:stageIn .6s .16s cubic-bezier(.16,1,.3,1) both}
.slide.active .pipe-enc{animation:stageIn .6s .3s cubic-bezier(.16,1,.3,1) both}
.slide.active .pipe-vecs{animation:stageIn .6s .44s cubic-bezier(.16,1,.3,1) both}
.slide.active .pipe-pool{animation:pool .62s .6s cubic-bezier(.16,1,.3,1) both}
.slide.active .pipe-vec.one{animation:resolve .58s .78s cubic-bezier(.16,1,.3,1) both}
.slide.active .pipe-out .rail{animation:railY .54s .96s cubic-bezier(.16,1,.3,1) both}
.slide.active .pipe-out .val{animation:stageIn .54s 1.14s cubic-bezier(.16,1,.3,1) both}
@keyframes dash{0%{opacity:0;transform:translateX(0) scale(.7)}25%{opacity:1}
                100%{opacity:0;transform:translateX(30px) scale(1)}}
@keyframes stageIn{from{opacity:0;transform:translate3d(-14px,0,0)}
                   to{opacity:1;transform:translate3d(0,0,0)}}
@keyframes pool{from{opacity:.35;transform:translateX(-14px)}to{opacity:1;transform:translateX(0)}}
@keyframes resolve{from{opacity:.4;transform:scale(.78)}to{opacity:1;transform:scale(1)}}
@keyframes railY{from{transform:scaleY(0)}to{transform:scaleY(1)}}

/* ---------- respect the OS setting ---------- */
@media (prefers-reduced-motion: reduce){
  .slide.active *,.slide.active *::before,.slide.active *::after{
    animation:none!important;transition:none!important}
}