:root{
  --bg:#f7f6f3;--surface:#ffffff;--rule:#e3e0da;--rule-s:#edeae5;
  --text:#191817;--text-2:#4a4845;--text-3:#716c66;
  --teal:#1b6b77;--teal-m:#1f7782;--teal-d:#13525c;--teal-l:#e6f4f6;--teal-r:rgba(27,107,119,.2);
  --red:#b83c2e;--red-d:#9a3025;--green:#1e7a56;--amber:#8a5d10;
  --on-dark:rgba(255,255,255,.94);--on-dark-2:rgba(255,255,255,.80);--on-dark-3:rgba(255,255,255,.70);
  --head:linear-gradient(180deg,#0d0d0c 0%,#211f1c 55%,#3d3932 100%);
  --navbg:rgba(247,246,243,.97);
  --fs-micro:.75rem;--fs-util:.8125rem;
  --serif:'DM Serif Display',Georgia,serif;
  --sans:'DM Sans',system-ui,-apple-system,sans-serif;
  --mono:'IBM Plex Mono',ui-monospace,monospace;
}

/* Dark mode. Unnested deliberately: CSS nesting is unsupported on older
   iPadOS Safari, and these pages are opened on iPads. */
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --bg:#141413;--surface:#1d1c1a;--rule:#38352f;--rule-s:#2a2825;
    --text:#f2f0ed;--text-2:#c9c5bf;--text-3:#a8a39c;
    --teal:#4aa5b2;--teal-m:#5bb3c0;--teal-d:#6fc0cb;--teal-l:#1e4a52;--teal-r:rgba(111,192,203,.28);
    --red:#e08478;--red-d:#e08478;--green:#5cbf92;--amber:#d9a441;
    --head:linear-gradient(180deg,#0a0a09 0%,#16150f 55%,#262420 100%);
    --navbg:rgba(20,20,19,.97);
  }
}
:root[data-theme="dark"]{
  --bg:#141413;--surface:#1d1c1a;--rule:#38352f;--rule-s:#2a2825;
  --text:#f2f0ed;--text-2:#c9c5bf;--text-3:#a8a39c;
  --teal:#4aa5b2;--teal-m:#5bb3c0;--teal-d:#6fc0cb;--teal-l:#1e4a52;--teal-r:rgba(111,192,203,.28);
  --red:#e08478;--red-d:#e08478;--green:#5cbf92;--amber:#d9a441;
  --head:linear-gradient(180deg,#0a0a09 0%,#16150f 55%,#262420 100%);
    --navbg:rgba(20,20,19,.97);
}
/* Raster artwork carries its own white ground; on a dark page it needs a
   card rather than sitting as a lit rectangle against the background. */
:root[data-theme="dark"] .imgfig,
:root[data-theme="dark"] .vplay img{border:1px solid var(--rule)}
.themebtn{font-family:var(--mono);font-size:var(--fs-micro);letter-spacing:.1em;text-transform:uppercase;background:none;color:var(--text-2);border:1px solid var(--rule);padding:.5rem .8rem;cursor:pointer;min-height:44px}
.themebtn:hover{color:var(--text);border-color:var(--text-2)}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--text);font-family:var(--sans);font-size:17px;line-height:1.75;-webkit-font-smoothing:antialiased}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation:none!important;transition:none!important}}
a{color:var(--teal-d)}
:focus-visible{outline:3px solid var(--teal-d);outline-offset:2px}
.skip{position:absolute;left:-9999px;top:0;background:var(--text);color:var(--bg);padding:.75rem 1.25rem;z-index:999;font-family:var(--mono);font-size:var(--fs-util)}
.skip:focus{left:0}

nav.site{position:sticky;top:0;z-index:200;background:var(--navbg);backdrop-filter:blur(14px);border-bottom:1px solid var(--rule);min-height:58px;display:flex;align-items:center;padding:.5rem 2.5rem;justify-content:space-between;gap:1rem;flex-wrap:wrap}
.nav-left{display:flex;align-items:center;gap:.85rem}
.nav-wordmark{font-family:var(--serif);font-size:1.2rem;font-style:italic;color:var(--text);text-decoration:none;display:inline-flex;align-items:center;min-height:44px}
.nav-div{width:1px;height:15px;background:var(--rule)}
.nav-unit{font-family:var(--mono);font-size:var(--fs-micro);letter-spacing:.18em;text-transform:uppercase;color:var(--text-2)}
.nav-links{display:flex;gap:1.5rem;list-style:none;flex-wrap:wrap}
.nav-links a{font-family:var(--mono);font-size:var(--fs-util);letter-spacing:.12em;text-transform:uppercase;color:var(--text-2);text-decoration:none;display:inline-flex;align-items:center;min-height:44px}
.nav-links a:hover{color:var(--text)}
.nav-links a[aria-current="page"]{color:var(--teal-d);border-bottom:2px solid var(--teal-d)}

/* Reading progress — the cheapest answer to "how long is this?" */
.progress-track{position:fixed;top:0;left:0;height:4px;width:100%;background:var(--rule);z-index:299}
.progress{position:fixed;top:0;left:0;height:4px;width:0;background:var(--teal-m);z-index:300;transition:width .1s linear}
@media (prefers-reduced-motion:reduce){.progress{transition:none}}

.paper-head{background:var(--head);padding:4rem 2.5rem 3.25rem}
.ph-inner{max-width:760px;margin:0 auto}
.ph-vol{font-family:var(--mono);font-size:var(--fs-util);letter-spacing:.24em;text-transform:uppercase;color:var(--on-dark-3);display:block;margin-bottom:1.5rem}
.ph-title{font-family:var(--serif);font-size:clamp(2.1rem,5vw,3.4rem);line-height:1.1;color:#fff;letter-spacing:-.015em;margin-bottom:.85rem}
.ph-sub{font-size:1.1rem;color:var(--on-dark-2);line-height:1.6;margin-bottom:2.25rem;max-width:62ch}
.byline{border-top:1px solid rgba(255,255,255,.18);padding-top:1.5rem}
.byline-name{font-family:var(--mono);font-size:var(--fs-util);font-weight:400;letter-spacing:.06em;color:var(--on-dark);margin-bottom:.25rem}
.byline-meta{font-family:var(--mono);font-size:var(--fs-util);font-weight:400;letter-spacing:.06em;color:var(--on-dark-2);line-height:1.7}
.byline-date{font-family:var(--mono);font-size:var(--fs-micro);letter-spacing:.14em;text-transform:uppercase;color:var(--on-dark-3);margin-top:.6rem}

/* Two-column shell: section rail + article. The rail is a quiet text list —
   no branding, no CTA — so it reads as a table of contents, not site chrome. */
.shell{max-width:1120px;margin:0 auto;padding:3.5rem 2.5rem 1rem;display:grid;grid-template-columns:186px minmax(0,760px);gap:3.5rem;justify-content:center}
/* Grid items default to min-width:auto and refuse to shrink below their
   content, which lets the scrollable table widen its own track. */
.shell>*{min-width:0}
.secnav{position:sticky;top:80px;align-self:start}
.secnav-h{font-family:var(--mono);font-size:var(--fs-micro);letter-spacing:.18em;text-transform:uppercase;color:var(--text-2);padding-bottom:.75rem;border-bottom:1px solid var(--rule);margin-bottom:.35rem}
.secnav ol{list-style:none;counter-reset:s}
.secnav li{counter-increment:s}
.secnav a{display:flex;gap:.6rem;align-items:baseline;padding:.6rem .5rem .6rem .75rem;font-size:.9rem;line-height:1.4;color:var(--text-2);text-decoration:none;border-left:2px solid transparent;min-height:44px}
.secnav a::before{content:counter(s,decimal-leading-zero);font-family:var(--mono);font-size:var(--fs-micro);color:var(--text-2);opacity:.75;flex:none}
.secnav a:hover{color:var(--text);background:var(--surface)}
.secnav a[aria-current="true"]{color:var(--teal-d);border-left-color:var(--teal-d);font-weight:700;background:var(--surface)}
.secnav a[aria-current="true"]::before{color:var(--teal-d);opacity:1}
.secnav-meta{font-family:var(--mono);font-size:var(--fs-micro);letter-spacing:.08em;color:var(--text-2);margin-top:1rem;padding-top:.85rem;border-top:1px solid var(--rule);line-height:1.7}

/* Narrow: the rail becomes a collapsible Contents above the article. */
.toc-mobile{display:none;border:1px solid var(--rule);background:var(--surface);margin-bottom:2rem}
.toc-mobile summary{padding:.9rem 1.25rem;font-family:var(--mono);font-size:var(--fs-util);letter-spacing:.12em;text-transform:uppercase;color:var(--teal-d);cursor:pointer;min-height:44px;display:flex;align-items:center}
.toc-mobile ol{list-style:none;counter-reset:m;border-top:1px solid var(--rule-s);padding:.5rem 0}
.toc-mobile li{counter-increment:m}
.toc-mobile a{display:flex;gap:.6rem;align-items:baseline;padding:.7rem 1.25rem;font-size:.95rem;color:var(--text-2);text-decoration:none;min-height:44px}
.toc-mobile a::before{content:counter(m,decimal-leading-zero);font-family:var(--mono);font-size:var(--fs-micro);opacity:.75}
.toc-mobile a:hover{color:var(--text);background:var(--bg)}

.wrap{max-width:760px;margin:0 auto;padding:3.5rem 2.5rem 1rem}
.lede{font-size:1.18rem;line-height:1.7;color:var(--text);border-left:3px solid var(--teal);padding-left:1.5rem;margin-bottom:2rem}
.dl{display:flex;align-items:center;justify-content:space-between;gap:1.25rem;flex-wrap:wrap;background:var(--surface);border:1px solid var(--rule);padding:1.25rem 1.5rem;margin-bottom:3rem}
.dl-meta{font-family:var(--mono);font-size:var(--fs-util);letter-spacing:.08em;text-transform:uppercase;color:var(--text-2);line-height:1.8}
.dl-btn{display:inline-flex;align-items:center;gap:.5rem;min-height:44px;padding:.7rem 1.25rem;background:var(--text);color:var(--bg);font-family:var(--mono);font-size:var(--fs-util);letter-spacing:.12em;text-transform:uppercase;text-decoration:none;white-space:nowrap}
.dl-btn:hover{background:var(--teal-d);color:var(--bg)}

.sec-num{font-family:var(--mono);font-size:var(--fs-micro);letter-spacing:.24em;text-transform:uppercase;color:var(--teal-d);display:block;margin:3.5rem 0 .5rem;padding-top:1.5rem;border-top:1px solid var(--rule);scroll-margin-top:88px}
h2{font-family:var(--serif);font-size:1.95rem;line-height:1.2;color:var(--text);margin:0 0 1.15rem;letter-spacing:-.01em}
h3{font-family:var(--mono);font-size:var(--fs-util);letter-spacing:.16em;text-transform:uppercase;color:var(--text-2);margin:2.25rem 0 .75rem}
h3.named{font-family:var(--serif);font-size:1.3rem;letter-spacing:-.005em;text-transform:none;color:var(--text);margin:2.5rem 0 .85rem}
p{color:var(--text-2);margin-bottom:1.15rem}
p strong,li strong,dd strong{color:var(--text);font-weight:700}

.pull{font-family:var(--serif);font-size:clamp(1.3rem,3vw,1.7rem);line-height:1.4;color:var(--text);border-left:3px solid var(--teal);padding-left:1.75rem;margin:2.5rem 0}
.close-line{font-family:var(--serif);font-size:clamp(1.5rem,3.5vw,2.1rem);line-height:1.35;color:var(--text);text-align:center;margin:1rem 0}
.close-wrap{border-top:1px solid var(--rule);border-bottom:1px solid var(--rule);padding:3rem 1rem;margin:3.5rem 0}

/* spec blocks */
.spec{background:var(--surface);border:1px solid var(--rule);margin:2rem 0}
.spec-cap{font-family:var(--mono);font-size:var(--fs-micro);letter-spacing:.16em;text-transform:uppercase;color:var(--text-2);padding:1rem 1.5rem;border-bottom:1px solid var(--rule);background:var(--bg)}
.spec dl{margin:0}
.spec-row{display:grid;grid-template-columns:1fr auto;gap:1rem;align-items:baseline;padding:.95rem 1.5rem;border-bottom:1px solid var(--rule-s)}
.spec-row:last-child{border-bottom:none}
.spec dt{font-size:.95rem;color:var(--text-2)}
.spec dt small{display:block;font-size:.85rem;color:var(--text-2);opacity:.85;margin-top:.15rem}
.spec dd{font-family:var(--mono);font-size:1.05rem;font-weight:500;color:var(--text);white-space:nowrap;font-variant-numeric:tabular-nums}
.spec dd.theo{color:var(--text-2);font-size:.95rem}

.tscroll{overflow-x:auto;-webkit-overflow-scrolling:touch;max-width:100%}
.tscroll:focus-visible{outline:3px solid var(--teal-d);outline-offset:-3px}
figure{margin:2.5rem 0;background:var(--surface);border:1px solid var(--rule)}
table.data{width:100%;border-collapse:collapse;min-width:26rem}
table.data caption{text-align:left;padding:1.1rem 1.5rem;font-family:var(--mono);font-size:var(--fs-micro);letter-spacing:.16em;text-transform:uppercase;color:var(--text-2);border-bottom:1px solid var(--rule)}
table.data th,table.data td{padding:.85rem 1.5rem;text-align:left;font-size:.95rem;border-bottom:1px solid var(--rule-s)}
table.data thead th{font-family:var(--mono);font-size:var(--fs-micro);letter-spacing:.14em;text-transform:uppercase;color:var(--text-2);background:var(--bg)}
table.data td{color:var(--text-2)}
table.data td.num{font-family:var(--mono);font-variant-numeric:tabular-nums;color:var(--text)}
table.data tbody tr:last-child td,table.data tbody tr:last-child th{border-bottom:none}
figcaption{padding:1.15rem 1.5rem;border-top:1px solid var(--rule-s);background:var(--bg)}
.fig-n{font-family:var(--mono);font-size:var(--fs-micro);letter-spacing:.16em;text-transform:uppercase;color:var(--teal-d);display:block;margin-bottom:.4rem}
.fig-cap{font-size:.95rem;color:var(--text-2);line-height:1.65}
.basis{display:block;margin-top:.9rem;padding-top:.85rem;border-top:1px dashed var(--rule);font-size:.88rem;color:var(--text-2);line-height:1.65}
.basis strong{color:var(--text)}
.mk{color:var(--amber);font-weight:700;font-family:var(--mono)}
.fig-tier{display:inline-block;font-family:var(--mono);font-size:var(--fs-micro);letter-spacing:.1em;text-transform:uppercase;color:var(--text-2);background:var(--surface);border:1px solid var(--rule);padding:.25rem .65rem;margin-top:.75rem}

/* audience blocks */
.aud{border-left:3px solid var(--rule);padding-left:1.5rem;margin:2rem 0}
.aud h3{margin-top:0;color:var(--teal-d)}
.aud p:last-child{margin-bottom:0}

.standards{background:var(--surface);border:1px solid var(--rule);padding:1.5rem;margin:2.5rem 0}
.standards p{margin-bottom:0;font-family:var(--mono);font-size:var(--fs-util);letter-spacing:.06em;color:var(--text-2);line-height:2}
.srcnote{font-size:.92rem;color:var(--text-2);font-style:italic;border-top:1px solid var(--rule);padding-top:1.5rem;margin-top:2.5rem}

.pub-note{background:var(--surface);border:1px solid var(--rule);padding:1.75rem 2rem;margin:3rem 0 0}
.pub-h{font-family:var(--mono);font-size:var(--fs-util);letter-spacing:.18em;text-transform:uppercase;color:var(--text-2);margin-bottom:.85rem}
.pub-p{font-size:.95rem;color:var(--text-2);line-height:1.75;margin-bottom:0}
.footer-zone{border-top:1px solid var(--rule);margin-top:3.5rem;background:var(--bg)}
footer{max-width:760px;margin:0 auto;padding:2rem 2.5rem;display:flex;justify-content:space-between;gap:1.5rem;flex-wrap:wrap}
.footer-left{font-family:var(--mono);font-size:var(--fs-util);letter-spacing:.08em;text-transform:uppercase;color:var(--text-2);line-height:1.9}
.footer-links{display:flex;gap:1.25rem;flex-wrap:wrap}
.footer-links a{font-family:var(--mono);font-size:var(--fs-util);letter-spacing:.08em;text-transform:uppercase;color:var(--text-2);text-decoration:none;display:inline-flex;align-items:center;min-height:44px}
.footer-links a:hover{color:var(--text);text-decoration:underline}
.footer-copy{font-family:var(--mono);font-size:var(--fs-micro);letter-spacing:.08em;color:var(--text-2);width:100%;border-top:1px solid var(--rule);padding-top:1rem;line-height:2.6}
.footer-copy a{padding:.65rem .25rem}

@media (max-width:1040px){
  /* One column. The shell owns the gutter from here down — leaving .wrap's
     own padding in place would double it and push the track wider than the
     viewport. justify-content returns to stretch so the 1fr track fills. */
  .shell{grid-template-columns:minmax(0,1fr);justify-content:stretch;gap:0;
         max-width:760px;padding:3.5rem 2.5rem 1rem}
  /* margin:0 auto on a grid item disables stretch alignment and makes it
     shrink-to-fit its max-content, which is how the table was widening the
     page. The single track is already full width, so the auto margins go. */
  .wrap{padding:0;max-width:none;margin:0;width:100%}
  .secnav{display:none}
  .toc-mobile{display:block}
}
@media (max-width:860px){
  nav.site{padding:.5rem 1.25rem}
  .shell{padding:2.5rem 1.25rem 1rem}
  .paper-head{padding:2.75rem 1.25rem 2.25rem}
  footer{padding:2rem 1.25rem}
  table.data th,table.data td{padding:.75rem 1rem}
  .spec-row{padding:.9rem 1rem}
  figcaption{padding:1rem}
}
@media (max-width:560px){
  .nav-unit{display:none}
  .spec-row{grid-template-columns:1fr;gap:.25rem}
  .spec dd{white-space:normal}
}
.svgfig{padding:1.5rem 1rem .5rem}
.svgfig svg{display:block;width:100%;height:auto}
.sv-label{font-family:'IBM Plex Mono',monospace;font-size:13px;fill:var(--text-2)}
.sv-val{font-family:'DM Sans',sans-serif;font-size:15px;font-weight:700;fill:var(--text)}
.imgfig{display:block;width:100%;height:auto;background:#fff}
.caveat{background:var(--bg);border:1px solid var(--rule);border-left:3px solid var(--amber);padding:1.25rem 1.5rem;margin:2rem 0}
.caveat p{margin-bottom:0;font-size:.95rem;color:var(--text)}

/* ================= PRINT ================= */
@media print{
  /* Force the light palette regardless of the reader's system setting.
     A dark-mode PDF is unreadable on paper and ruinous on toner. */
  :root,:root[data-theme="dark"],:root[data-theme="light"]{
    --bg:#ffffff;--surface:#ffffff;--rule:#b9b5ae;--rule-s:#dedad4;
    --text:#000000;--text-2:#2a2927;--text-3:#46443f;
    --teal:#13525c;--teal-m:#13525c;--teal-d:#0e3f47;--teal-l:#eef7f8;
    --teal-r:rgba(19,82,92,.35);
    --red:#8f2d21;--red-d:#8f2d21;--green:#12543a;--amber:#664408;
    --navbg:#ffffff;
  }
  *{-webkit-print-color-adjust:exact;print-color-adjust:exact}

  /* Interface chrome means nothing on paper. */
  nav.site,.progress,.progress-track,.skip,.secnav,.toc-mobile,
  .dl,.themebtn,.vicon,.vdur,.footer-links,.nf-btn,.nf-hp{display:none!important}

  body{background:#fff;color:#000;font-size:10.5pt;line-height:1.52}
  .shell{display:block}
  .wrap{max-width:none;width:auto;margin:0;padding:0}

  /* The header gradient is a screen device; on paper it is a black slab. */
  .paper-head{background:#fff!important;padding:0 0 10pt;margin:0 0 14pt;
    border-bottom:1.5pt solid var(--rule)}
  .ph-inner{max-width:none;padding:0}
  .ph-vol,.ph-title,.ph-sub,.byline,.byline-name,.byline-meta,.byline-date{color:#000!important}
  .ph-title{font-size:22pt;line-height:1.15}
  .ph-sub{font-size:11pt}
  .byline-name,.byline-meta,.byline-date{color:#2a2927!important;font-size:9pt}

  /* A horizontal scroll region prints as a clipped table, i.e. a lost table. */
  .tscroll{overflow:visible!important;width:auto!important}
  table{width:100%!important;font-size:8.6pt;page-break-inside:avoid;break-inside:avoid}
  table td,table th{padding:3pt 5pt!important}

  figure,.tierblk,.rule-box,.srow,.gap,.caveat,.wip,.notify,.calc,.spec,.frow,
  .pub-note,.serieslist,.imgfig,.video{page-break-inside:avoid;break-inside:avoid}
  h1,h2,h3,.sec-num{page-break-after:avoid;break-after:avoid}
  h2{margin-top:15pt}
  p,li{orphans:3;widows:3}

  /* The transcript carries the film's content for anyone reading on paper. */
  details.transcript{display:block!important}
  details.transcript>summary{display:none!important}
  details.transcript>*{display:block!important}
  .video img,.imgfig img{max-width:100%;height:auto}

  a{color:#000;text-decoration:underline}
  /* Internal routes are noise in print; a real URL is worth carrying. */
  a[href^="http"]::after{content:" <" attr(href) ">";font-size:7.5pt;
    color:#46443f;word-break:break-all;text-decoration:none}

  .footer-zone,footer{background:none!important;border-top:1pt solid var(--rule);
    padding:8pt 0 0;margin-top:14pt}
  footer,.footer-left,.footer-copy{color:#2a2927!important;font-size:8pt}

  @page{size:A4;margin:17mm 15mm}
}