/* ===== The First History — pop-up storybook engine ===== */
:root{
  --ink:#2b2218; --ink-soft:#5b4c38; --parch:#efe2c4; --parch-d:#e2d2ad;
  --gold:#b5862f; --gold-lite:#d9af52; --paper-edge:#d8c49a;
  --shadow:rgba(28,20,10,.45); --glow:rgba(217,175,82,.45);
  --card:#f5ecd4; --line: #cdb890;
  --serif:"Iowan Old Style","Palatino Linotype",Palatino,Georgia,"Times New Roman",serif;
  --sans:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{height:100%;margin:0}
body{
  font-family:var(--serif); color:var(--ink); overflow:hidden; user-select:none;
  background:
    radial-gradient(120% 130% at 50% 12%, #2a2418 0%, #15110a 60%, #0c0a06 100%);
}

/* ---- top bar ---- */
#bar{position:fixed;top:0;left:0;right:0;height:48px;z-index:40;display:flex;
  align-items:center;gap:10px;padding:0 14px;
  background:linear-gradient(#0c0a06ee,#0c0a0699);backdrop-filter:blur(4px);
  border-bottom:1px solid #3a2f1c;color:var(--parch)}
#bar .title{font-size:15px;letter-spacing:.04em;color:var(--gold-lite)}
#bar .spacer{flex:1}
#bar button{font-family:var(--sans);font-size:12px;letter-spacing:.08em;
  text-transform:uppercase;color:var(--parch);background:#1c1810;
  border:1px solid #4a3c24;border-radius:999px;padding:7px 12px;cursor:pointer;
  transition:.2s}
#bar button:hover{border-color:var(--gold);color:var(--gold-lite)}
#bar button.on{background:#3a2c12;border-color:var(--gold);color:var(--gold-lite)}

/* ---- book stage ---- */
#stage{position:absolute;inset:48px 0 0 0;display:flex;align-items:center;
  justify-content:center;perspective:2200px}
#book{position:relative;width:min(97vw,1500px);height:min(94vh,960px);
  transform-style:preserve-3d}

/* each page */
.page{position:absolute;inset:0;border-radius:8px 14px 14px 8px;overflow:hidden;
  transform-origin:left center;transform-style:preserve-3d;
  backface-visibility:hidden;
  background:var(--parch);
  box-shadow:0 24px 60px -18px #000, inset 0 0 0 1px #00000010;
  transition:transform .9s cubic-bezier(.6,.02,.2,1)}
.page.flipped{transform:rotateY(-178deg)}
.page::before{ /* paper texture + edge */
  content:"";position:absolute;inset:0;pointer-events:none;
  background:
    linear-gradient(90deg,#00000022 0 8px,transparent 18px),
    radial-gradient(140% 120% at 100% 50%, transparent 60%, #b89c6622 100%);
  mix-blend-mode:multiply}
.page .underside{position:absolute;inset:0;transform:rotateY(180deg);
  backface-visibility:hidden;background:
   repeating-linear-gradient(135deg,#e7d8b4,#e7d8b4 14px,#e0cfa6 14px,#e0cfa6 28px);
  display:flex;align-items:center;justify-content:center;color:#9a8454;
  font-style:italic;letter-spacing:.1em}

/* ---- page inner layout ---- */
.pin{position:absolute;inset:0;display:flex;flex-direction:column}
/* ---- the pop-up scene ---- */
.scene{position:relative;flex:1 1 50%;min-height:0;overflow:hidden;
  border-bottom:2px solid #00000022}
.scene .backdrop{position:absolute;inset:0;width:100%;height:100%;
  object-fit:cover;filter:saturate(.92) contrast(1.02)}
.scene .vignette{position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(120% 100% at 50% 30%,transparent 50%,#1a120899 100%)}
.scene .motiftitle{position:absolute;left:0;right:0;top:14px;text-align:center;
  color:#f5ecd4;text-shadow:0 2px 10px #000;font-size:clamp(20px,3.4vw,34px);
  letter-spacing:.06em;z-index:6;pointer-events:none}
.scene .eyebrow{position:absolute;left:0;right:0;top:6px;text-align:center;z-index:6;
  font-family:var(--sans);font-size:10px;letter-spacing:.4em;text-transform:uppercase;
  color:var(--gold-lite);pointer-events:none}

/* pop-up cut-outs */
.popup{position:absolute;transform-origin:bottom center;
  transform:translateX(-50%) rotateX(90deg);opacity:0;
  transition:transform 1s cubic-bezier(.34,1.4,.5,1),opacity .5s;
  filter:drop-shadow(0 10px 8px #00000055)}
.popup img{display:block;width:100%;height:auto}
.popup.up{transform:translateX(-50%) rotateX(0deg);opacity:1}
.popup::after{content:"";position:absolute;left:8%;right:8%;bottom:-6px;height:10px;
  background:radial-gradient(50% 100% at 50% 0,#00000055,transparent 70%);
  transform:scaleY(.6)}

/* ---- lower text region ---- */
.lower{flex:1 1 50%;display:flex;flex-direction:column;min-height:0;overflow-y:auto;
  padding:14px 18px 10px;background:
   linear-gradient(#f5ecd4,#ecdcb8)}
.summary{font-size:clamp(13px,1.5vw,15.5px);line-height:1.5;color:var(--ink-soft);
  margin:0 0 10px}
.summary b{color:var(--ink)}

/* source cards */
.cards{display:flex;gap:10px;overflow-x:auto;padding-bottom:6px;flex:0 0 auto;
  touch-action:pan-x;-webkit-overflow-scrolling:touch;overscroll-behavior-x:contain}
.card .strips{min-height:6px}
.card{flex:0 0 auto;width:188px;background:var(--card);border:1px solid var(--line);
  border-radius:8px;padding:10px 11px;display:flex;flex-direction:column;gap:5px;
  cursor:pointer;position:relative;transition:.18s;box-shadow:0 3px 8px -4px #0006}
.card:hover{transform:translateY(-3px);border-color:var(--gold)}
.card .cult{font-family:var(--sans);font-size:10px;letter-spacing:.18em;
  text-transform:uppercase;font-weight:600}
.card .surv{font-size:17px;line-height:1.1;color:var(--ink)}
.card .work{font-size:11px;color:#7a6a4c;font-style:italic;line-height:1.25}
.card .snip{font-size:11.5px;color:var(--ink-soft);line-height:1.35;
  display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.card .dates{font-family:var(--sans);font-size:9.5px;color:#9a8a68;letter-spacing:.02em}
.card .pq{position:absolute;top:8px;right:8px;font-family:var(--sans);font-size:8px;
  letter-spacing:.1em;text-transform:uppercase;padding:2px 5px;border-radius:4px}
.card .pq.verbatim{background:#dff0d8;color:#3a6a2a}
.card .pq.paraphrase{background:#f0e6cf;color:#8a6a2a}
/* motif strips */
.strips{display:flex;flex-wrap:wrap;gap:3px;margin-top:auto}
.strip{height:6px;flex:1 1 18px;border-radius:3px;background:#d8c49a;opacity:.5;
  transition:.2s}
.strip.has{background:var(--gold);opacity:.85}
.strip.hot{background:var(--gold-lite);opacity:1;box-shadow:0 0 8px var(--glow)}

/* science / evidence lens */
body.sci-lens{background:radial-gradient(120% 130% at 50% 12%, #16201f 0%, #0a0f0e 60%, #06090a 100%);}
.card.sci{border-top:3px solid #3f7d8c;background:#eef1ec}
.card.sci .surv{font-size:16px;color:#1c2a28}
.pq.sci{color:#fff}
.pq.sci.strong{background:#2f7d5f}
.pq.sci.suggestive{background:#8a7a2a}
.pq.sci.contested{background:#8a4a4a}
#btnLens.on{background:#15302e;border-color:#3f9d8c;color:#7fe3d4}

/* material evidence */
.evhead{margin:10px 0 6px;font-family:var(--sans);font-size:10px;letter-spacing:.22em;
  text-transform:uppercase;color:#9a6a2a;border-top:1px solid #d8c49a;padding-top:8px}
.card.artifact{border-top:3px solid #9a6a2a;background:#f1e6cf}
.card.artifact .surv{font-size:15px}
.evcards{flex:0 0 auto}

.card.witness{border-top:3px solid var(--gold);background:#f3ead0}
.card.witness .surv{font-size:16px}

/* motif legend */
.legend{display:flex;flex-wrap:wrap;gap:6px;margin-top:8px}
.chip{font-family:var(--sans);font-size:10.5px;letter-spacing:.02em;
  padding:4px 9px;border-radius:999px;background:#e6d6b0;border:1px solid var(--line);
  color:var(--ink-soft);cursor:pointer;transition:.15s}
.chip:hover{border-color:var(--gold)}
.chip.hot{background:var(--gold);color:#1c1408;border-color:var(--gold-lite);
  box-shadow:0 0 10px var(--glow)}

/* stub chapter */
.stub{flex:1;display:flex;flex-direction:column;gap:8px;padding:16px 20px;
  background:linear-gradient(#f5ecd4,#ecdcb8);overflow:auto}
.stub .tag{font-family:var(--sans);font-size:10px;letter-spacing:.3em;
  text-transform:uppercase;color:var(--gold)}
.stub h3{margin:0;font-size:13px;color:var(--ink-soft);font-weight:normal}
.stub ul{margin:4px 0 0;padding-left:0;list-style:none;display:flex;
  flex-direction:column;gap:6px}
.stub li{font-size:13px;background:#f5ecd4;border:1px solid var(--line);
  border-left:3px solid var(--gold);border-radius:6px;padding:8px 11px}
.stub li b{font-family:var(--sans);font-size:10px;letter-spacing:.12em;
  text-transform:uppercase;color:#8a6a2a;display:block;margin-bottom:2px}

/* ---- cover ---- */
.cover{position:absolute;inset:0}
.cover .bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;
  filter:saturate(.85) brightness(.7)}
.cover .frame{position:absolute;inset:18px;border:2px solid #d9af5277;border-radius:6px;
  pointer-events:none}
.cover .ctext{position:absolute;inset:0;display:flex;flex-direction:column;
  align-items:center;justify-content:center;text-align:center;color:#f5ecd4;padding:24px}
.cover .eyebrow{font-family:var(--sans);font-size:11px;letter-spacing:.55em;
  text-transform:uppercase;color:var(--gold-lite)}
.cover h1{font-size:clamp(34px,7vw,72px);margin:.12em 0;letter-spacing:.02em;
  text-shadow:0 3px 24px #000}
.cover .sub{font-style:italic;font-size:clamp(14px,2.2vw,20px);color:#e8dcc0;
  text-shadow:0 2px 12px #000;max-width:24ch}
.cover .tagline{margin-top:.8em;font-family:var(--sans);font-size:11px;
  letter-spacing:.4em;text-transform:uppercase;color:#cbb98e}
.cover .open{margin-top:26px;font-family:var(--sans);font-size:12px;letter-spacing:.2em;
  text-transform:uppercase;color:#1c1408;background:var(--gold-lite);border:none;
  padding:12px 22px;border-radius:999px;cursor:pointer;box-shadow:0 0 22px var(--glow)}

/* ---- nav arrows + footer ---- */
.nav{position:fixed;top:50%;transform:translateY(-50%);z-index:35;
  width:46px;height:46px;border-radius:50%;border:1px solid #4a3c24;
  background:#1c1810cc;color:var(--parch);font-size:20px;cursor:pointer;
  display:flex;align-items:center;justify-content:center;transition:.2s}
.nav:hover{border-color:var(--gold);color:var(--gold-lite)}
.nav[disabled]{opacity:.25;cursor:default}
#prev{left:10px}
#next{right:10px}
#foot{position:fixed;bottom:8px;left:0;right:0;text-align:center;z-index:35;
  font-family:var(--sans);font-size:11px;letter-spacing:.2em;color:#cbb98e88}

/* ---- drawer (scholarly) ---- */
#scrim{position:fixed;inset:0;background:#0c0a06bb;z-index:50;opacity:0;
  pointer-events:none;transition:.25s}
#scrim.open{opacity:1;pointer-events:auto}
#drawer{position:fixed;top:0;right:0;height:100%;width:min(440px,92vw);z-index:51;
  background:linear-gradient(#f7efd9,#ecdcb8);transform:translateX(100%);
  transition:transform .3s cubic-bezier(.4,0,.2,1);overflow-y:auto;
  box-shadow:-20px 0 60px #000a;padding:22px 22px 40px}
#drawer.open{transform:translateX(0)}
#drawer .x{position:absolute;top:12px;right:14px;font-size:22px;cursor:pointer;
  color:var(--ink-soft);background:none;border:none}
#drawer .dcult{font-family:var(--sans);font-size:11px;letter-spacing:.22em;
  text-transform:uppercase;font-weight:700;margin-top:6px}
#drawer h2{margin:.1em 0 .1em;font-size:30px}
#drawer .dwork{font-style:italic;color:#7a6a4c;margin-bottom:14px}
#drawer blockquote{margin:0 0 14px;padding:12px 16px;background:#fffaf0;
  border-left:4px solid var(--gold);border-radius:0 6px 6px 0;font-size:16px;
  line-height:1.55;color:var(--ink)}
#drawer .meta{font-size:13px;line-height:1.5;color:var(--ink-soft)}
#drawer .meta div{margin-bottom:8px}
#drawer .meta b{font-family:var(--sans);font-size:10px;letter-spacing:.12em;
  text-transform:uppercase;color:#8a6a2a;display:block}
#drawer .dchips{display:flex;flex-wrap:wrap;gap:6px;margin:12px 0}
#drawer a{color:#8a5a1a}
#drawer .qtag{display:inline-block;font-family:var(--sans);font-size:10px;
  letter-spacing:.1em;text-transform:uppercase;padding:3px 8px;border-radius:5px;
  margin-bottom:12px}
#drawer .qtag.verbatim{background:#dff0d8;color:#3a6a2a}
#drawer .qtag.paraphrase{background:#f0e6cf;color:#8a6a2a}

/* ---- timeline overlay ---- */
#timeline{position:fixed;inset:48px 0 0 0;z-index:45;background:#12100a;
  color:var(--parch);overflow:auto;padding:24px 22px 60px;display:none}
#timeline.open{display:block}
#timeline h2{font-size:24px;color:var(--gold-lite);margin:0 0 4px;text-align:center}
#timeline .tsub{text-align:center;font-family:var(--sans);font-size:11px;
  letter-spacing:.04em;color:#cbb98e;margin-bottom:8px}
.axis{position:relative;height:30px;margin:18px 2% 6px;border-bottom:1px solid #4a3c24}
.axis .tick{position:absolute;bottom:0;transform:translateX(-50%);font-family:var(--sans);
  font-size:10px;color:#9a8a68}
.axis .tick::after{content:"";position:absolute;left:50%;bottom:-1px;width:1px;height:8px;
  background:#4a3c24}
.axis .rome{position:absolute;top:-6px;bottom:-560px;width:0;
  border-left:1px dashed #a85a3a99;z-index:0}
.axis .rome span{position:absolute;top:-2px;left:6px;font-family:var(--sans);
  font-size:9px;letter-spacing:.06em;color:#c87a4a;white-space:nowrap}
.trow{position:relative;height:34px;margin:0 2%;z-index:1}
.trow .lbl{position:absolute;left:0;top:8px;font-family:var(--sans);font-size:11px;
  letter-spacing:.12em;text-transform:uppercase;color:var(--gold-lite)}
.tmark{position:absolute;top:8px;transform:translateX(-50%);width:11px;height:11px;
  border-radius:50%;cursor:default}
.tmark.tradition{background:none;border:2px solid var(--gold-lite)}
.tmark.text{background:var(--gold-lite)}
.tline{position:absolute;top:13px;height:2px;background:#6a5a3a55}
.tlegend{text-align:center;font-family:var(--sans);font-size:11px;color:#cbb98e;
  margin-top:18px}
.tlegend span{margin:0 10px}
.tlegend .d1{display:inline-block;width:10px;height:10px;border:2px solid var(--gold-lite);
  border-radius:50%;vertical-align:-1px}
.tlegend .d2{display:inline-block;width:10px;height:10px;background:var(--gold-lite);
  border-radius:50%;vertical-align:-1px}

/* ---- index overlay ---- */
#index{position:fixed;inset:48px 0 0 0;z-index:45;background:#12100ad8;
  backdrop-filter:blur(3px);display:none;align-items:center;justify-content:center}
#index.open{display:flex}
#index .grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
  gap:14px;max-width:820px;width:92%;max-height:84%;overflow:auto;padding:6px}
#index .ix{background:#f5ecd4;border:1px solid var(--line);border-radius:8px;
  padding:14px;cursor:pointer;transition:.18s;border-top:3px solid var(--gold)}
#index .ix:hover{transform:translateY(-3px);box-shadow:0 8px 22px -8px #000}
#index .ix .n{font-family:var(--sans);font-size:10px;letter-spacing:.2em;color:#8a6a2a}
#index .ix h3{margin:3px 0 6px;font-size:19px;color:var(--ink)}
#index .ix p{margin:0;font-size:12.5px;color:var(--ink-soft);line-height:1.4}
#index .ix .st{font-family:var(--sans);font-size:9px;letter-spacing:.15em;
  text-transform:uppercase;color:#a8946a;margin-top:8px}
#index .ix .st.complete{color:#3a8a3a}

@media (max-width:640px){
  #prev{left:6px}#next{right:6px}
  .nav{width:38px;height:38px;opacity:.85}
  #book{width:100vw;height:calc(100vh - 48px);height:calc(100dvh - 48px)}   /* full-bleed page on mobile; vh fallback before dvh */
  .page{border-radius:0}
  .scene{flex:1 1 46%;min-height:46%}   /* guarantee the backdrop has a real height to fill */
  .lower{flex:1 1 54%;padding:12px 12px 10px}
  .cards{scroll-snap-type:x proximity}
  .card{width:74vw;max-width:300px;scroll-snap-align:start}
  .card .surv{font-size:19px}
  .card .snip{font-size:13px;-webkit-line-clamp:4}
  .summary{font-size:14.5px}
  .scene .motiftitle{font-size:clamp(22px,6vw,30px)}
}
@media (prefers-reduced-motion:reduce){
  .page{transition:opacity .3s}
  .page.flipped{transform:none;opacity:0;pointer-events:none}
  .popup{transition:opacity .4s;transform:translateX(-50%) rotateX(0)}
  .popup.up{opacity:1}
}