/* naoveil · preprint layout: contents rail | article column with margin notes. Tokens follow research/marketing/naoveil-brand-book.html. */
@font-face{font-family:"Newsreader";src:url(/fonts/newsreader-var.woff2) format("woff2");font-weight:400 600;font-style:normal;font-display:swap}
@font-face{font-family:"Newsreader";src:url(/fonts/newsreader-italic.woff2) format("woff2");font-weight:400;font-style:italic;font-display:swap}
@font-face{font-family:"IBM Plex Sans";src:url(/fonts/plex-sans-var.woff2) format("woff2");font-weight:400 600;font-style:normal;font-display:swap}
@font-face{font-family:"IBM Plex Mono";src:url(/fonts/plex-mono-400.woff2) format("woff2");font-weight:400;font-display:swap}
@font-face{font-family:"IBM Plex Mono";src:url(/fonts/plex-mono-500.woff2) format("woff2");font-weight:500;font-display:swap}

:root{
  --ink:#0E1238; --sub:#3B4166; --muted:#555C82; --line:#D6DAE8;
  --paper:#F7F8FB; --surface:#FFFFFF; --gauze:#E9ECF5;
  --navy:#00046D; --on-navy:#FFFFFF; --teal:#0B7A72; --amber:#A85F00; --crimson:#C3003F;
  --veil:rgba(185,190,232,.5); --veil-edge:#8B91D6;
  --display:"Newsreader",Georgia,"Times New Roman",serif;
  --body:"IBM Plex Sans",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,"SFMono-Regular",Consolas,monospace;
  --col:66ch; --note:15rem;
  color-scheme:light;
}

@media (prefers-color-scheme:dark){:root{
  --ink:#E6E8F6; --sub:#BCC1DE; --muted:#8E94BC; --line:#2A2F55;
  --paper:#0C0F24; --surface:#141833; --gauze:#1B1F3D;
  --navy:#A9B0FF; --on-navy:#0C0F24; --teal:#4CC2B6; --amber:#E4A04A; --crimson:#FF6B8E;
  --veil:rgba(110,118,200,.32); --veil-edge:#7C83D8;
  color-scheme:dark;
}}

*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:24px}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{margin:0;background:var(--paper);color:var(--ink);font:17px/1.65 var(--body);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
a{color:var(--navy);text-underline-offset:3px;text-decoration-thickness:1px}
a:hover{text-decoration-thickness:2px}
:focus-visible{outline:2px solid var(--navy);outline-offset:3px;border-radius:2px}
p,ul,dl,dd,figure,h1,h2,h3,pre{margin:0}
b{font-weight:600}
.mono{font-family:var(--mono);font-size:.88em}
.small{font-size:14px;color:var(--muted)}
.nowrap{white-space:nowrap}
.label{font:500 11.5px/1.2 var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}
.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}
.skip{position:absolute;left:16px;top:-48px;background:var(--surface);padding:8px 12px;z-index:10}
.skip:focus{top:12px}

/* Buttons */
.btn{display:inline-flex;align-items:center;gap:8px;font:500 15px/1 var(--body);padding:13px 18px;border-radius:5px;border:1px solid var(--navy);background:var(--navy);color:var(--on-navy);text-decoration:none;cursor:pointer;transition:transform .15s ease,box-shadow .15s ease}
.btn:hover{transform:translateY(-1px);box-shadow:0 4px 14px rgba(0,4,109,.18)}
.btn:active{transform:none}
.btn-small{font-size:13.5px;padding:9px 13px}
.btn-ghost{background:transparent;color:var(--navy)}
.btn:disabled{opacity:.4;cursor:not-allowed;transform:none;box-shadow:none}
.link{font-weight:500}
.actions{display:flex;flex-wrap:wrap;align-items:center;gap:14px 22px}

/* Masthead */
.masthead{max-width:1240px;margin:0 auto;padding:22px 24px;display:flex;align-items:center;gap:24px;border-bottom:1px solid var(--line)}
.wordmark{display:flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none;font:600 24px/1 var(--body);letter-spacing:-.02em}
.wordmark i,.wordmark-sm i{font-style:normal;font-weight:400}
.wm-text{display:grid;gap:3px}
.wm-text small{font:500 12px/1 var(--mono);letter-spacing:.02em;color:var(--muted)}
.mark{width:30px;height:30px}
.mark-grid{fill:none;stroke:currentColor;stroke-width:3}
.mark-veil{fill:var(--veil)}
.mark-arc{fill:none;stroke:var(--teal);stroke-width:3;stroke-linecap:round}
.journal{font:500 12px/1.3 var(--mono);color:var(--muted);margin-right:auto}

/* Page grid */
.page{max-width:1240px;margin:0 auto;padding:0 24px;display:grid;grid-template-columns:11rem minmax(0,1fr);gap:56px}
.toc{position:sticky;top:24px;align-self:start;padding-top:56px;font-size:13.5px}
.toc ol{list-style:none;padding:0;margin:12px 0 0;display:grid;gap:1px;border-left:1px solid var(--line)}
.toc a{display:block;padding:5px 0 5px 12px;margin-left:-1px;border-left:2px solid transparent;color:var(--sub);text-decoration:none}
.toc a span{font-family:var(--mono);color:var(--muted);margin-right:4px}
.toc a:hover{color:var(--ink)}
.toc a.on{border-left-color:var(--navy);color:var(--ink);font-weight:500}
main{min-width:0}
article{display:grid;gap:72px;padding:56px 0 96px}

/* Title block */
.title-block{display:grid;gap:18px;max-width:calc(var(--col) + var(--note) + 48px)}
h1{font:500 clamp(44px,7vw,84px)/.98 var(--display);letter-spacing:-.025em;text-wrap:balance}
h1 em{font-style:italic;font-weight:400;color:var(--sub)}
.subtitle{font:400 clamp(20px,2.2vw,24px)/1.4 var(--display);color:var(--sub);max-width:44ch;text-wrap:pretty}
.byline{display:flex;flex-wrap:wrap;gap:14px 36px;padding-top:18px;border-top:1px solid var(--line);font-size:14px}
.byline dt{font:500 10.5px/1.2 var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin-bottom:3px}

/* Key points box */
.keypoints{background:var(--surface);border:1px solid var(--line);border-top:3px solid var(--navy);border-radius:2px 2px 6px 6px;padding:26px 28px;display:grid;gap:20px;max-width:calc(var(--col) + 6ch)}
.keypoints dl{display:grid;gap:14px}
.keypoints dl div{display:grid;grid-template-columns:7rem minmax(0,1fr);gap:16px}
.keypoints dt{font-weight:600;font-size:15px}
.keypoints dd{color:var(--sub)}

/* Sections with margin notes */
.sec{display:grid;gap:22px}
.sec h2{font:500 clamp(28px,3.4vw,36px)/1.15 var(--display);letter-spacing:-.01em;display:flex;align-items:baseline;gap:14px}
.num{font:500 15px/1 var(--mono);color:var(--muted)}
.sec-body{display:grid;grid-template-columns:minmax(0,var(--col)) var(--note);gap:48px;align-items:start}
.prose{display:grid;gap:16px;max-width:var(--col);min-width:0}
.prose h3{font:600 17px/1.3 var(--body);margin-top:10px}
.prose p{text-wrap:pretty}
.note{font-size:14px;line-height:1.55;color:var(--sub);padding-left:16px;border-left:1px solid var(--line);display:grid;gap:12px}
.note b{color:var(--ink)}

/* Figures */
.fig{display:grid;gap:14px}
.fig-head{display:flex;justify-content:space-between;align-items:baseline;flex-wrap:wrap;gap:6px 20px}
.fig-file{font:12.5px/1.3 var(--mono);color:var(--muted)}
.fig-file span{color:var(--ink)}
figcaption{font-size:14.5px;line-height:1.6;color:var(--sub);max-width:calc(var(--col) + 10ch)}
figcaption b{color:var(--ink)}
.keys{display:inline-flex;gap:14px;margin-left:6px;white-space:nowrap}
.key{font:12px var(--mono);color:var(--muted);display:inline-flex;align-items:center;gap:6px}
.key i{width:14px;height:10px;border-radius:2px;display:inline-block}
.k-t{background:var(--veil);outline:1px solid var(--veil-edge)}
.k-p{border:1.5px solid var(--amber)}

/* Worksheet tables */
.sheet{border-collapse:collapse;font:13.5px/1.35 var(--mono);font-variant-numeric:tabular-nums;width:100%;background:var(--surface)}
.sheet th,.sheet td{text-align:left;padding:10px 14px;border-bottom:1px solid var(--line);white-space:nowrap}
.sheet th{font-weight:500;font-size:12px;color:var(--ink);background:var(--gauze)}
.sheet th small{display:block;font-size:10px;font-weight:400;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin-top:2px}
.sheet tbody tr:last-child td{border-bottom:0}
.sheet .iv{border-left:1px solid var(--line);text-align:right}

/* Fig. 1 veil */
.veil-scroll{overflow-x:auto;border:1px solid var(--line);border-radius:6px;background:var(--surface)}
.veil{--x:58%;position:relative;min-width:960px;user-select:none}
.veil .sheet{min-width:960px;table-layout:fixed}
/* Both layers share fixed column widths so the cut lines up cell for cell. */
.veil .sheet th:nth-child(1){width:14%}.veil .sheet th:nth-child(2){width:16%}
.veil .sheet th:nth-child(3){width:13%}.veil .sheet th:nth-child(4){width:8%}
.veil .sheet th:nth-child(5){width:14%}.veil .sheet th:nth-child(6){width:14%}
.veil .sheet th:nth-child(7){width:11%}.veil .sheet th:nth-child(8){width:10%}
.veil .sheet td,.veil .sheet th{overflow:hidden;text-overflow:clip}
.layer-proc{position:absolute;inset:0;clip-path:inset(0 calc(100% - var(--x)) 0 0)}
.layer-proc td.t{color:var(--teal);background:linear-gradient(var(--veil),var(--veil)) center/calc(100% - 8px) calc(100% - 10px) no-repeat}
.layer-proc td.x{color:var(--muted);text-decoration:line-through}
.layer-proc td.p{color:var(--amber);font-weight:500;box-shadow:inset 0 0 0 1.5px var(--amber);border-radius:3px}
.layer-proc .iv,.layer-raw .iv{color:var(--ink);font-weight:500}
.layer-proc th{background:color-mix(in srgb,var(--gauze) 60%,var(--veil))}
.veil-handle{position:absolute;top:0;bottom:0;left:var(--x);width:2px;margin-left:-1px;background:var(--veil-edge);pointer-events:none}
.veil-handle span{position:absolute;top:50%;left:50%;width:34px;height:34px;margin:-17px 0 0 -17px;border-radius:50%;background:var(--surface);border:2px solid var(--veil-edge);box-shadow:0 2px 10px rgba(14,18,56,.18)}
.veil-handle span::before,.veil-handle span::after{content:"";position:absolute;top:50%;width:0;height:0;border:5px solid transparent;margin-top:-5px}
.veil-handle span::before{left:4px;border-right-color:var(--veil-edge)}
.veil-handle span::after{right:4px;border-left-color:var(--veil-edge)}
#veil-range{position:absolute;inset:0;width:100%;height:100%;margin:0;opacity:0;cursor:ew-resize;touch-action:pan-y}
.veil:has(#veil-range:focus-visible) .veil-handle span{outline:2px solid var(--navy);outline-offset:3px}

/* Fig. 2 months */
.months{display:grid;grid-template-columns:minmax(0,1fr);gap:16px}
.compact{min-width:760px}
/* Divider between the raw export (left) and what naoveil writes (right). */
.compact .out{border-left:2px solid var(--veil-edge)}
.compact td.red{color:var(--teal);background:linear-gradient(var(--veil),var(--veil)) center/calc(100% - 8px) calc(100% - 8px) no-repeat}
.month{background:var(--surface);border:1px solid var(--line);border-radius:6px;overflow:hidden;min-width:0;display:flex;flex-direction:column}
.month-head{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:10px;padding:14px 16px;border-bottom:1px solid var(--line)}
.month-head h3{font:500 20px/1.2 var(--display)}
.btn-row{display:flex;flex-wrap:wrap;gap:8px}
.tbl-wrap{overflow-x:auto;min-width:0}
.compact th,.compact td{padding:8px 12px;font-size:12.5px}
.compact td.pending{color:var(--muted)}
.compact tr.fresh td{animation:land .5s ease both}
.compact td.keep{color:var(--teal);font-weight:500}
.compact td.new{color:var(--navy)}
.compact td.broke{color:var(--crimson);font-weight:500}
.compact td.ok{color:var(--teal);font-weight:500}
@keyframes land{from{background:var(--veil)}to{background:transparent}}
@media (prefers-reduced-motion:reduce){.compact tr.fresh td{animation:none}.btn{transition:none}}
.verdict{font:500 14px/1.5 var(--body);padding:12px 16px;border-radius:5px;background:var(--gauze);color:var(--ink)}
.verdict.good{background:color-mix(in srgb,var(--teal) 14%,var(--surface))}
.verdict.bad{background:color-mix(in srgb,var(--crimson) 12%,var(--surface))}

/* Record */
.log-wrap{display:grid;gap:10px}
.log{font:13px/1.7 var(--mono);background:#0E1238;color:#E6E8F6;padding:22px 24px;border-radius:6px;border:1px solid var(--line);overflow-x:auto;tab-size:4}
.log .c{color:#8E94BC}
.log .p{color:#F2C27B}

/* Surfaces */
.surfaces{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));border-top:1px solid var(--line)}
.surfaces>div{padding:20px 24px 4px 0;display:grid;gap:8px;align-content:start}
.surfaces>div+div{padding-left:24px;border-left:1px solid var(--line)}
.surfaces h3{font:500 21px/1.2 var(--display)}
.surfaces p{font-size:15px;color:var(--sub)}

/* Results table */
.results{border-collapse:collapse;width:100%;font-size:15px;font-variant-numeric:tabular-nums}
.results th{font:500 11px/1.2 var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--muted);text-align:left;padding:0 16px 10px 0;border-bottom:2px solid var(--ink)}
.results td{padding:12px 16px 12px 0;border-bottom:1px solid var(--line);vertical-align:top}
.results td:nth-child(2){font-weight:500}
.results td:nth-child(3){color:var(--muted);font-size:14px}

/* Limitations */
.limits{list-style:none;padding:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px 40px;max-width:calc(var(--col) * 1.6)}
.limits li{padding-top:14px;border-top:1px solid var(--line);color:var(--sub);font-size:15.5px}
.limits b{display:block;color:var(--ink);margin-bottom:2px}

/* Audiences, use cases, steps, record */
.sec>.lede{font:400 clamp(19px,2vw,22px)/1.45 var(--display);color:var(--sub);max-width:52ch;text-wrap:pretty}
.audiences{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));border-top:1px solid var(--line)}
.audiences>div{padding:20px 24px 4px 0;display:grid;gap:8px;align-content:start}
.audiences>div+div{padding-left:24px;border-left:1px solid var(--line)}
.audiences h3{font:500 22px/1.2 var(--display)}
.audiences p:not(.label){font-size:15.5px;color:var(--sub)}
.cases{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.cases>div{background:var(--surface);border:1px solid var(--line);border-radius:6px;padding:22px 24px;display:grid;gap:8px;align-content:start}
.cases h3{font:600 17px/1.3 var(--body)}
.cases p{font-size:15.5px;color:var(--sub)}
.steps{list-style:none;counter-reset:step;padding:0;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:28px}
.steps li{counter-increment:step;display:grid;gap:6px;align-content:start;padding-top:16px;border-top:2px solid var(--ink)}
.steps li::before{content:counter(step);font:500 13px/1 var(--mono);color:var(--muted)}
.steps h3{font:500 21px/1.2 var(--display)}
.steps p{font-size:15px;color:var(--sub)}
.record-card{background:var(--surface);border:1px solid var(--line);border-radius:6px}
.record{border-collapse:collapse;width:100%;min-width:560px;font-size:15px}
.record th{font:500 11px/1.2 var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--muted);text-align:left;padding:12px 18px;background:var(--gauze)}
.record td{padding:12px 18px;border-top:1px solid var(--line);vertical-align:top}
.record td:nth-child(3){color:var(--sub);font-size:14px}

/* Questions and answers */
.faq{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:26px 44px;max-width:calc(var(--col) * 1.6)}
.qa{display:grid;gap:6px;align-content:start;padding-top:14px;border-top:1px solid var(--line)}
.qa h3{font:600 16.5px/1.35 var(--body)}
.qa p{font-size:15.5px;color:var(--sub);text-wrap:pretty}

/* Pilot */
.pilot{background:var(--surface);border:1px solid var(--line);border-radius:6px;padding:36px}
.pilot-lede{font:400 clamp(22px,2.4vw,27px)/1.35 var(--display);color:var(--ink)}

/* Footer */
.foot{border-top:1px solid var(--line);max-width:1240px;margin:0 auto;padding:40px 24px 48px;font-size:14px;color:var(--sub)}
.foot-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:28px}
.foot-h{font:500 11px/1.2 var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}
.foot-grid>div,.foot-grid>nav{display:grid;gap:4px;align-content:start}
.foot-grid a{display:inline-block;padding-block:4px;min-height:24px}
.wordmark-sm{font:600 22px/1 var(--body);letter-spacing:-.02em;color:var(--ink)}
address{font-style:normal;line-height:1.7}
.copyright{margin-top:32px;font-size:12px;color:var(--muted)}

/* Legal pages */
.legal{max-width:1240px;margin:0 auto;padding:48px 24px 96px}
.legal article{display:grid;gap:14px}
.legal article>:not(.legal-tbl){max-width:72ch}
.legal-tbl{max-width:1100px}
.legal h1{font:500 clamp(36px,5vw,56px)/1.05 var(--display);letter-spacing:-.02em}
.legal .updated{font:500 12px/1.3 var(--mono);color:var(--muted);margin-bottom:12px}
.legal h2{font:500 26px/1.2 var(--display);margin-top:24px}
.legal p,.legal li{color:var(--sub);text-wrap:pretty}
.legal b{color:var(--ink)}
.legal ul{margin:0;padding-left:20px;display:grid;gap:8px}
.legal-tbl{border:1px solid var(--line);border-radius:6px;background:var(--surface)}
.legal-tbl table{border-collapse:collapse;width:100%;min-width:720px;font-size:14px}
.legal-tbl th{font:500 11px/1.2 var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--muted);text-align:left;padding:10px 12px;background:var(--gauze)}
.legal-tbl td{padding:10px 12px;border-top:1px solid var(--line);vertical-align:top;color:var(--sub)}

/* Responsive */
@media (max-width:1100px){
  .sec-body{grid-template-columns:minmax(0,1fr);gap:20px}
  .note{max-width:var(--col)}
}
@media (max-width:860px){
  .page{grid-template-columns:minmax(0,1fr);gap:0}
  .toc{display:none}
  .journal{display:none}
  .masthead{justify-content:space-between}
  article{padding-top:40px;gap:56px}
  .months,.surfaces,.limits,.faq{grid-template-columns:minmax(0,1fr)}
  .audiences,.cases{grid-template-columns:minmax(0,1fr)}
  .audiences>div,.audiences>div+div{padding:18px 0 4px;border-left:0}
  .audiences>div+div{border-top:1px solid var(--line)}
  .steps{grid-template-columns:repeat(2,minmax(0,1fr))}
  .foot-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .surfaces>div,.surfaces>div+div{padding:18px 0 4px;border-left:0}
  .surfaces>div+div{border-top:1px solid var(--line)}
}
@media (max-width:560px){
  body{font-size:16px}
  .masthead,.page,.foot,.legal{padding-left:16px;padding-right:16px}
  .masthead .btn{display:none}
  .keypoints{padding:20px}
  .keypoints dl div{grid-template-columns:minmax(0,1fr);gap:2px}
  .pilot{padding:24px 20px}
  .keys{display:flex;margin:8px 0 0}
  .foot-grid{grid-template-columns:minmax(0,1fr)}
  .steps{grid-template-columns:minmax(0,1fr)}
  /* Fig. 1 fits the screen: ID, name, both dates and the gap carry the story. */
  .veil,.veil .sheet{min-width:0}
  .veil .sheet th:nth-child(3),.veil .sheet td:nth-child(3),
  .veil .sheet th:nth-child(4),.veil .sheet td:nth-child(4),
  .veil .sheet th:nth-child(7),.veil .sheet td:nth-child(7){display:none}
  .veil .sheet th:nth-child(1){width:24%}.veil .sheet th:nth-child(2){width:20%}
  .veil .sheet th:nth-child(5),.veil .sheet th:nth-child(6){width:22%}.veil .sheet th:nth-child(8){width:12%}
  .veil .sheet td:nth-child(2){white-space:normal}
  .veil .sheet th,.veil .sheet td{padding:9px 5px;font-size:11px}
  .veil .sheet th{white-space:normal;font-size:10px}
  .veil .sheet th small{font-size:8.5px;letter-spacing:0}
  .layer-proc td.t{background-size:calc(100% - 4px) calc(100% - 8px)}
}