:root{
  /* palette: explorer navy + pukapasoft chrome */
  --bg:#060a12; --bg1:#0b1220; --bg2:#101a2b;
  --edge:#1a2438; --edge2:#26344d;
  --ink:#e6efff; --dim:#8598b8; --dim2:#63748f; --muted:#3d4a63;
  --teal:#4fd8ff; --teal-d:#2b93b8; --teal-g:rgba(79,216,255,.07);
  --gold:#f2c14e; --gold-g:rgba(242,193,78,.08);
  --green:#34d399; --hot:#ff5d5d; --violet:#a78bfa;

  --display:'Raleway','Helvetica Neue',Arial,sans-serif;
  --sans:'DM Sans',system-ui,'Segoe UI',Roboto,sans-serif;
  --mono:'JetBrains Mono',ui-monospace,Consolas,monospace;
  --serif:"Iowan Old Style","Source Serif Pro",Cambria,"Palatino Linotype",Georgia,serif;
  --measure:70ch;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{background:var(--bg);color:var(--ink);font-family:var(--sans);font-weight:300;
  font-size:16px;line-height:1.7;overflow-x:hidden;-webkit-font-smoothing:antialiased;
  min-height:100vh;display:flex;flex-direction:column}
body::before{content:'';position:fixed;inset:0;pointer-events:none;z-index:0;
  background-image:linear-gradient(rgba(79,216,255,.02) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(79,216,255,.02) 1px,transparent 1px);
  background-size:72px 72px}
body::after{content:'';position:fixed;inset:0;pointer-events:none;z-index:0;
  background:radial-gradient(ellipse 62% 42% at 50% -6%,rgba(79,216,255,.07) 0%,transparent 62%)}
main{flex:1;position:relative;z-index:1}
a{color:var(--teal);text-decoration:none}
a:hover{text-decoration:underline}
::selection{background:rgba(79,216,255,.25)}
.skip{position:absolute;left:-9999px}
.skip:focus{left:.5rem;top:.5rem;z-index:300;background:var(--bg1);padding:.5rem .8rem;border:1px solid var(--teal)}

/* ── chrome ───────────────────────────────────────────── */
.topbar{position:sticky;top:0;z-index:100;height:52px;display:flex;align-items:center;
  justify-content:space-between;padding:0 clamp(1rem,4vw,2.5rem);
  background:rgba(6,10,18,.9);backdrop-filter:blur(20px);border-bottom:1px solid var(--edge)}
.brand{font-family:var(--display);font-weight:900;font-size:.95rem;letter-spacing:.01em;color:var(--ink)}
.brand:hover{text-decoration:none}
.brand .z{color:var(--teal);font-size:1.1rem}
.navlinks{display:flex;gap:1.4rem}
.navlinks a{font-family:var(--mono);font-size:.65rem;letter-spacing:.1em;text-transform:uppercase;color:var(--dim2)}
.navlinks a:hover{color:var(--teal);text-decoration:none}

.wrap{width:100%;max-width:880px;margin:0 auto;padding:0 clamp(1rem,4vw,2rem);position:relative;z-index:1}
.wide{max-width:1180px}

/* ── hero ─────────────────────────────────────────────── */
.hero{padding:6rem 0 3.4rem;text-align:center}
.eyebrow{display:inline-block;font-family:var(--mono);font-size:.58rem;letter-spacing:.2em;
  text-transform:uppercase;color:var(--teal);border:1px solid rgba(79,216,255,.22);border-radius:20px;
  padding:.28rem 1rem;background:var(--teal-g);margin-bottom:1.8rem;
  opacity:0;animation:rise .5s ease .05s both}
h1.big{font-family:var(--display);font-size:clamp(2.3rem,6vw,4.2rem);font-weight:900;
  letter-spacing:-.035em;line-height:.98;margin-bottom:1.3rem;
  background:linear-gradient(150deg,#fff 26%,var(--teal) 100%);
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;
  opacity:0;animation:rise .55s ease .15s both}
.lede{font-size:1.06rem;font-weight:300;color:var(--dim);max-width:620px;margin:0 auto 1.8rem;line-height:1.8;
  opacity:0;animation:rise .55s ease .25s both}
.lede b,.lede strong{color:var(--ink);font-weight:500}
@keyframes rise{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:translateY(0)}}

/* ── sections ─────────────────────────────────────────── */
section{padding:3.6rem 0;position:relative}
section+section{border-top:1px solid var(--edge)}
.sec-label{display:block;font-family:var(--mono);font-size:.58rem;letter-spacing:.2em;
  text-transform:uppercase;color:var(--teal);margin-bottom:.7rem}
h2{font-family:var(--display);font-size:clamp(1.5rem,3vw,2rem);font-weight:800;letter-spacing:-.025em;
  line-height:1.15;margin:0 0 .8rem}
h3{font-family:var(--display);font-size:1.15rem;font-weight:700;letter-spacing:-.01em;margin:2.2rem 0 .6rem}
h4{font-family:var(--sans);font-size:.98rem;font-weight:500;margin:1.6rem 0 .5rem;color:var(--dim)}
p{margin:0 0 1.05rem}
.dim{color:var(--dim)}
ul,ol{margin:0 0 1.1rem;padding-left:1.35rem}
li{margin:.35rem 0}
hr{border:0;border-top:1px solid var(--edge);margin:2.2rem 0}
blockquote{border-left:2px solid var(--teal-d);background:var(--teal-g);padding:1rem 1.2rem;
  margin:1.4rem 0;border-radius:0 10px 10px 0}
blockquote p:last-child{margin-bottom:0}
code{font-family:var(--mono);font-size:.85em;background:var(--bg2);border:1px solid var(--edge);
  border-radius:4px;padding:.06em .36em;color:var(--teal)}
pre{background:var(--bg2);border:1px solid var(--edge);border-radius:10px;padding:1rem;
  overflow-x:auto;margin:1.3rem 0}
pre code{background:none;border:0;padding:0;color:var(--dim)}

/* ── cards ────────────────────────────────────────────── */
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(258px,1fr));gap:1rem;margin-top:1.8rem}
.card{background:var(--bg1);border:1px solid var(--edge);border-radius:14px;padding:1.6rem 1.5rem;
  display:flex;flex-direction:column;gap:.55rem;position:relative;overflow:hidden;
  transition:transform .2s,border-color .2s;color:inherit;text-decoration:none}
.card::before{content:'';position:absolute;top:0;left:0;right:0;height:2px;
  background:linear-gradient(90deg,transparent,var(--teal),transparent);opacity:.6}
.card.gold::before{background:linear-gradient(90deg,transparent,var(--gold),transparent)}
a.card:hover{transform:translateY(-3px);border-color:var(--edge2);text-decoration:none}
.card-num{font-family:var(--mono);font-size:.58rem;letter-spacing:.16em;text-transform:uppercase;color:var(--teal)}
.card.gold .card-num{color:var(--gold)}
.card-name{font-family:var(--display);font-size:1.2rem;font-weight:900;letter-spacing:-.022em;line-height:1.1}
.card-sub{font-family:var(--serif);font-size:.86rem;color:var(--dim2);font-style:italic;line-height:1.45}
.card-desc{font-size:.87rem;color:var(--dim);line-height:1.65;flex:1}
.card-go{font-family:var(--mono);font-size:.63rem;letter-spacing:.07em;color:var(--teal);margin-top:.35rem}

/* ── callouts ─────────────────────────────────────────── */
.note{border:1px solid var(--edge);border-left:3px solid var(--gold);background:var(--gold-g);
  border-radius:0 12px 12px 0;padding:1.1rem 1.3rem;margin:1.8rem 0;font-size:.93rem}
.note.cy{border-left-color:var(--teal);background:var(--teal-g)}
.note h4{margin-top:0;color:var(--gold);font-family:var(--mono);font-size:.64rem;
  letter-spacing:.14em;text-transform:uppercase}
.note.cy h4{color:var(--teal)}
.note p:last-child{margin-bottom:0}

/* ── rollouts ─────────────────────────────────────────── */
details{border:1px solid var(--edge);border-radius:10px;background:var(--bg1);margin:1.2rem 0;overflow:hidden}
details[open]{border-color:var(--edge2)}
summary{cursor:pointer;padding:.72rem 1rem;font-family:var(--sans);font-size:.84rem;font-weight:500;
  color:var(--teal);list-style:none;display:flex;align-items:center;gap:.55rem;user-select:none}
summary::-webkit-details-marker{display:none}
summary::before{content:'\25B8';font-size:.78rem;transition:transform .15s;color:var(--dim2)}
details[open]>summary::before{transform:rotate(90deg)}
summary:hover{background:var(--bg2)}
.dbody{padding:.3rem 1.2rem 1.15rem}

/* ── figures ──────────────────────────────────────────── */
figure{margin:1.5rem 0;border:1px solid var(--edge);border-radius:10px;overflow:hidden;background:#fff}
figure img{display:block;width:100%;height:auto}
.figgrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:.7rem;margin:1.4rem 0}
.figgrid a{display:block;border:1px solid var(--edge);border-radius:8px;overflow:hidden;background:#fff;
  transition:border-color .18s,transform .18s}
.figgrid a:hover{border-color:var(--teal);transform:translateY(-2px)}
.figgrid img{display:block;width:100%;height:118px;object-fit:cover}
.figref{font-family:var(--mono);font-size:.7rem;color:var(--dim2)}

/* ── tables ───────────────────────────────────────────── */
.tw{overflow-x:auto;margin:1.5rem 0;border:1px solid var(--edge);border-radius:10px;background:var(--bg1)}
table{border-collapse:collapse;width:100%;font-family:var(--sans);font-size:.8rem;line-height:1.55;
  font-variant-numeric:tabular-nums}
th{text-align:left;font-family:var(--mono);font-weight:500;font-size:.62rem;letter-spacing:.09em;
  text-transform:uppercase;color:var(--teal);background:var(--bg2);
  border-bottom:1px solid var(--edge);padding:.55rem .75rem;white-space:nowrap}
td{border-bottom:1px solid rgba(26,36,56,.7);padding:.55rem .75rem;vertical-align:top;color:var(--dim)}
td b,td strong{color:var(--ink)}
tbody tr:last-child td{border-bottom:0}
tbody tr:hover{background:rgba(79,216,255,.03)}

/* ── pills, stats, buttons ────────────────────────────── */
.pill{display:inline-block;font-family:var(--mono);font-size:.58rem;letter-spacing:.1em;
  text-transform:uppercase;padding:.16rem .55rem;border-radius:20px;border:1px solid var(--edge2);
  color:var(--dim2);margin-right:.35rem}
.pill.v{color:var(--green);border-color:rgba(52,211,153,.3)}
.pill.w{color:var(--gold);border-color:rgba(242,193,78,.3)}
.pill.r{color:var(--hot);border-color:rgba(255,93,93,.3)}
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(128px,1fr));gap:.8rem;margin:2rem 0}
.stat{background:var(--bg1);border:1px solid var(--edge);border-radius:10px;padding:1rem;text-align:center;
  position:relative;overflow:hidden}
.stat::before{content:'';position:absolute;top:0;left:0;right:0;height:1px;
  background:linear-gradient(90deg,transparent,var(--teal),transparent);opacity:.5}
.stat .v{font-family:var(--display);font-size:1.6rem;font-weight:900;color:var(--teal);line-height:1}
.stat .k{font-family:var(--mono);font-size:.55rem;letter-spacing:.12em;text-transform:uppercase;
  color:var(--dim2);margin-top:.4rem}
.btn{display:inline-flex;align-items:center;gap:.5rem;font-family:var(--sans);font-size:.85rem;font-weight:500;
  padding:.65rem 1.2rem;border-radius:9px;border:1px solid var(--teal-d);color:var(--teal);
  background:var(--teal-g);transition:background .16s,transform .16s}
.btn:hover{background:rgba(79,216,255,.14);text-decoration:none;transform:translateY(-1px)}
.btn.plain{border-color:var(--edge2);color:var(--dim);background:var(--bg1)}
.btn.plain:hover{background:var(--bg2);color:var(--ink)}
.btnrow{display:flex;flex-wrap:wrap;gap:.7rem;margin:1.6rem 0}

/* ── explorer frame ───────────────────────────────────── */
.viewerframe{width:100%;height:min(80vh,780px);border:1px solid var(--edge);border-radius:12px;
  background:#050913;overflow:hidden;box-shadow:0 0 60px rgba(79,216,255,.06)}
.viewerframe iframe{width:100%;height:100%;border:0;display:block}

/* ── paper pages: the reading form ────────────────────── */
/* one centred column for the whole document -- the head and the body share the
   same measure, so nothing has to be centred element by element */
body.paper .wrap{max-width:calc(var(--measure) + 5rem)}
body.paper .doc{font-family:var(--serif);font-size:17.5px;line-height:1.66;color:var(--ink)}
body.paper .doc .tw,body.paper .doc figure,body.paper .doc .figgrid{
  margin-left:calc(-1 * clamp(0rem,2vw,2.2rem));margin-right:calc(-1 * clamp(0rem,2vw,2.2rem))}
.paperhead{padding:3.4rem 0 1.8rem;border-bottom:2px solid var(--edge2)}
.paperhead .roman{font-family:var(--mono);font-size:.62rem;letter-spacing:.22em;text-transform:uppercase;
  color:var(--teal);margin-bottom:.9rem;display:block}
.paperhead h1{font-family:var(--display);font-size:clamp(1.7rem,4vw,2.6rem);font-weight:800;
  letter-spacing:-.03em;line-height:1.08;margin:0 0 .55rem}
.paperhead .sub{font-family:var(--serif);font-size:1.05rem;color:var(--dim);font-style:italic;line-height:1.5}
.doc{padding:2.2rem 0 3.5rem}
.doc h2{font-family:var(--display);font-size:1.45rem;font-weight:800;margin:3rem 0 1rem;
  padding-top:1.4rem;border-top:1px solid var(--edge)}
.doc h2:first-child{border-top:0;padding-top:0;margin-top:0}
.doc h3{font-family:var(--display);font-size:1.12rem;font-weight:700;margin:2.1rem 0 .6rem}
.doc h4,.doc h5,.doc h6{font-family:var(--sans);font-size:.98rem;font-weight:500;color:var(--dim);
  margin:1.5rem 0 .45rem}
.doc blockquote{font-family:var(--sans);font-size:.95rem}
.toc{background:var(--bg1);border:1px solid var(--edge);border-radius:12px;padding:1.15rem 1.35rem;
  margin:2rem 0;font-family:var(--sans);font-size:.85rem}
.toc h4{margin:0 0 .6rem;color:var(--teal);font-family:var(--mono);font-size:.6rem;
  letter-spacing:.16em;text-transform:uppercase}
.toc ul{list-style:none;margin:0;padding:0;columns:2;column-gap:1.8rem}
.toc li{margin:.2rem 0;break-inside:avoid}
.toc .l3{padding-left:.9rem;font-size:.94em}
.toc a{color:var(--dim)}
.toc a:hover{color:var(--teal)}
.pagernav{display:flex;justify-content:space-between;gap:1rem;margin:3rem 0 0;
  font-family:var(--sans);font-size:.84rem}

/* ── footer ───────────────────────────────────────────── */
footer{border-top:1px solid var(--edge);padding:2.2rem clamp(1rem,4vw,2.5rem);
  position:relative;z-index:1;background:var(--bg1)}
.ceiling{max-width:760px;margin:0 auto 1rem;padding:.9rem 1.1rem;border:1px solid rgba(255,93,93,.35);
  border-left:3px solid var(--hot);border-radius:0 8px 8px 0;background:rgba(255,93,93,.05);
  font-family:var(--sans);font-size:.83rem;color:var(--dim);text-align:left}
.foot-meta{max-width:760px;margin:0 auto;font-family:var(--mono);font-size:.6rem;color:var(--muted);
  text-align:center;letter-spacing:.04em;line-height:2.1}
.foot-meta a{color:var(--muted)}
.foot-meta a:hover{color:var(--teal)}

/* ── math ─────────────────────────────────────────────── */
.math{font-family:"Cambria Math","Latin Modern Math",Cambria,Georgia,serif;white-space:nowrap}
.math.disp{display:block;text-align:center;margin:1.3rem auto;font-size:1.06rem;white-space:normal;
  overflow-x:auto;max-width:100%;color:var(--ink)}
.math .rm{font-style:normal}
.math sup,.math sub{font-size:.7em}
.frac{display:inline-flex;flex-direction:column;vertical-align:middle;text-align:center;
  font-size:.86em;line-height:1.15}
.frac .n{border-bottom:1px solid currentColor;padding:0 .25em}
.frac .d{padding:0 .25em}
.rad{border-top:1px solid currentColor;padding:0 .12em}
.ovl{border-top:1px solid currentColor}
.hat::after{content:'\0302'}
.tld::after{content:'\0303'}
.vec::after{content:'\20D7'}

@media(max-width:680px){
  body{font-size:15.5px}
  body.paper .doc{font-size:16.5px}
  .navlinks{gap:.8rem}
  .navlinks a{font-size:.6rem}
  .toc ul{columns:1}
  .hero{padding:3.6rem 0 2.2rem}
  .viewerframe{height:60vh}
}
@media print{
  .topbar,.pagernav,.figgrid{display:none}
  body{background:#fff;color:#000}
  body::before,body::after{display:none}
  details{border:0}details>summary{display:none}.dbody{padding:0}
}