/* ============================================================
   SISKIN Labs — presentatie-huisstijl (herbruikbaar skelet)
   Standaard = licht/editorial. Toggle 't' of ?theme=bold = geel-variant.
   Type: Helvetica Neue (native op Mac), Inter/Arial als fallback.
   ============================================================ */

:root{
  --yellow:#F0E51B;
  --ink:#141414;          /* zacht zwart, editorial i.p.v. hard #000 */
  --muted:#6c6c66;
  --line:#e7e7e1;         /* hairline */
  --bg:#fcfcfa;
  --card:#ffffff;
  --maxw:1240px;
  --pad:58px;
  --fs-h1:60px; --fs-h2:42px; --fs-lead:21px; --fs-eyebrow:12.5px;
  font-family:'Helvetica Neue', Inter, Arial, sans-serif;
}
*{ box-sizing:border-box; margin:0; padding:0; }
html,body{ height:100%; }
body{ background:var(--bg); color:var(--ink); font-weight:500; overflow:hidden;
  -webkit-font-smoothing:antialiased; transition:background .25s, color .25s; }

/* ---------------- chrome ---------------- */
.deck{ position:fixed; inset:0; display:flex; flex-direction:column; }
.deck-header,.deck-footer{ display:flex; align-items:center; justify-content:space-between; }
.deck-header{ padding:22px var(--pad) 0; }
.deck-footer{ padding:0 var(--pad) 18px; }
.brand{ font-weight:800; letter-spacing:.01em; font-size:14px; }
.context,.hint,.pageno{ font-size:11.5px; letter-spacing:.16em; text-transform:uppercase; color:var(--muted); font-weight:600; }
.stagearea{ flex:1; position:relative; }

/* ---------------- slide basis ---------------- */
.slide{ position:absolute; inset:0; display:none; flex-direction:column; justify-content:flex-start;
  padding:26px var(--pad) 22px; max-width:var(--maxw); }
.slide.is-active{ display:flex; animation:sk-fade .40s ease; }
@keyframes sk-fade{ from{ opacity:0; transform:translateY(7px); } to{ opacity:1; transform:none; } }

/* ---------------- eyebrow (met gele tick) ---------------- */
.eyebrow{ font-size:var(--fs-eyebrow); font-weight:700; letter-spacing:.16em; text-transform:uppercase;
  color:var(--muted); display:flex; align-items:center; gap:11px; margin-bottom:20px; }
.eyebrow::before{ content:""; width:15px; height:15px; background:var(--yellow); flex:none; }

/* ---------------- typografie ---------------- */
.headline{ font-weight:900; letter-spacing:-.02em; line-height:1.06; }
h1.headline{ font-size:var(--fs-h1); }
h2.headline{ font-size:var(--fs-h2); }
.headline + .lead{ margin-top:22px; }
.lead{ font-size:var(--fs-lead); line-height:1.55; max-width:760px; }
.lead + .lead{ margin-top:15px; }
.small{ font-size:13px; color:var(--muted); }
.mark{ background:linear-gradient(transparent 58%, var(--yellow) 58%); padding:0 2px; font-weight:700; }
strong{ font-weight:800; }

/* ---------------- layouts ---------------- */
/* .title / .closing : gecentreerd, groot */
.slide.title, .slide.closing{ justify-content:center; }
/* .statement : één grote uitspraak */
.slide.statement{ justify-content:center; }
.slide.statement .headline{ font-size:52px; max-width:1020px; }
/* .split : kop boven, daaronder tekst | visual */
.split-body{ display:flex; gap:46px; align-items:center; margin-top:6px; flex:1; }
.split-body .col-text{ flex:1; }
.split-body .col-figure{ flex:1.15; display:flex; align-items:center; justify-content:center; }

/* ---------------- bullets ---------------- */
.bullets{ list-style:none; margin-top:8px; font-size:22px; line-height:1.4; }
.bullets li{ position:relative; padding:9px 0 9px 30px; }
.bullets li::before{ content:""; position:absolute; left:0; top:15px; width:11px; height:11px; background:var(--yellow); }

/* ---------------- figure (grafiek/diagram) ---------------- */
.figure{ background:var(--card); border:1px solid var(--line); border-radius:2px; padding:18px; }
.figure svg,.figure canvas{ display:block; max-width:100%; height:auto; }
.source{ font-size:11.5px; color:var(--muted); margin-top:10px; letter-spacing:.02em; }

/* ---------------- callout / quote ---------------- */
.callout{ background:var(--card); border:1px solid var(--line); border-left:5px solid var(--yellow);
  padding:22px 26px; border-radius:2px; }
.callout .q{ font-size:29px; font-weight:800; line-height:1.2; letter-spacing:-.01em; }
.callout .by{ margin-top:12px; font-size:14px; color:var(--muted); }

/* ---------------- stat / groot getal ---------------- */
.stat{ font-weight:900; font-size:86px; line-height:.95; letter-spacing:-.03em; }
.stat .unit{ font-size:34px; }
.statrow{ display:flex; align-items:baseline; gap:26px; margin-top:6px; }

/* ---------------- vergelijkingen / code ---------------- */
.eq{ font-family:'Helvetica Neue', ui-monospace, monospace; font-size:16px; line-height:1.9;
  background:var(--card); border:1px solid var(--line); border-radius:2px; padding:14px 18px; display:inline-block; }
.eq b{ font-weight:800; }

/* ---------------- knop ---------------- */
.btn{ font:inherit; font-weight:700; font-size:13px; letter-spacing:.04em; text-transform:uppercase; cursor:pointer;
  padding:10px 16px; border:1.5px solid var(--ink); background:transparent; color:var(--ink); border-radius:2px; }
.btn:hover{ background:var(--yellow); border-color:var(--ink); }

/* ============================================================
   BOLD-variant (geel canvas, brutalistisch) — toggle 't'
   ============================================================ */
body.bold{ --bg:#F0E51B; --ink:#000; --muted:rgba(0,0,0,.62); --line:#000; --card:#ffffff; }
body.bold .figure, body.bold .callout, body.bold .eq{ border-width:2.5px; box-shadow:7px 7px 0 #000; border-radius:0; }
body.bold .callout{ border-left-width:7px; }
body.bold .eyebrow::before{ outline:2px solid #000; outline-offset:-2px; }
body.bold .btn{ background:#000; color:var(--yellow); border-width:2.5px; border-radius:0; }

/* ---------------- print (elke slide een pagina) ---------------- */
@media print{
  body{ overflow:visible; }
  .deck-header,.deck-footer{ position:static; }
  .slide{ display:flex !important; position:relative; height:100vh; page-break-after:always; }
}