/* Brook project site. Light theme, system fonts, no external assets.
   Tokens are the figure palette that build.py also uses. */
:root{
  color-scheme:light;
  --paper:#fafaf8;--ink:#172b3a;--slate:#606b76;--slate-tint:#d8dde0;--slate-tint-2:#eff3f5;
  --teal:#008b83;--teal-tint:#e3f2f0;--violet:#6563aa;--violet-tint:#eceaf5;--ochre:#a96025;--ochre-tint:#f3eade;
  --link:#0b6f69;
  --serif:"Iowan Old Style","Palatino Linotype",Palatino,Georgia,serif;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --mono:ui-monospace,"SFMono-Regular",Menlo,Consolas,"Liberation Mono",monospace;
  --nav-h:56px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--nav-h) + 16px)}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:17px;line-height:1.65;-webkit-font-smoothing:antialiased}
a{color:var(--link);text-decoration-thickness:1px;text-underline-offset:.18em}
a:hover{text-decoration-thickness:2px}
:focus-visible{outline:2px solid var(--teal);outline-offset:2px}
img,svg{max-width:100%;height:auto}
img{display:block}
p,h1,h2,h3,h4,figure,dl,dd{margin:0}
p+p{margin-top:1rem}
ul,ol{margin:0;padding-left:1.2em}
h1,h2,h3{font-family:var(--serif);font-weight:500;letter-spacing:-.02em}
h1{font-size:clamp(2.4rem,5vw,4.5rem);line-height:1.05;max-width:18ch}
h2.claim{font-size:2.1rem;line-height:1.25;letter-spacing:-.015em;max-width:28ch}
h3{font-size:1.15rem;line-height:1.35;margin-bottom:.5rem}
code{font-family:var(--mono);font-size:.85em;overflow-wrap:anywhere}
pre{font-family:var(--mono);font-size:.83rem;line-height:1.7;overflow-x:auto;overflow-y:hidden;margin:0;padding:1.1rem 1.3rem;border:1px solid var(--slate-tint);background:var(--slate-tint-2);border-radius:3px;tab-size:4;scrollbar-width:thin;scrollbar-color:var(--slate) var(--slate-tint)}
pre::-webkit-scrollbar{height:9px}
pre::-webkit-scrollbar-track{background:var(--slate-tint)}
pre::-webkit-scrollbar-thumb{background:var(--slate);border-radius:4px}
pre code{font-size:inherit;overflow-wrap:normal}
data{font-family:var(--mono);font-variant-numeric:tabular-nums;color:var(--ink)}
::selection{background:var(--teal-tint)}

.wrap{width:min(1200px,calc(100% - 32px));margin-inline:auto}
.skip-link{position:absolute;left:1rem;top:-5rem;z-index:30;padding:.6rem 1rem;background:var(--ink);color:#fff}
.skip-link:focus{top:1rem;color:#fff}

/* Sticky nav: wordmark and section links. */
.site-nav{position:sticky;top:0;z-index:20;background:var(--paper);border-bottom:1px solid var(--slate-tint);min-height:var(--nav-h);display:flex;align-items:center;gap:1.25rem}
.wordmark{font-family:var(--serif);font-size:1.35rem;font-weight:500;color:var(--ink);text-decoration:none;padding:.4rem 0}

.nav-links{display:flex;gap:1rem;font-size:.86rem}
.nav-links a{text-decoration:none;color:var(--ink);padding:.5rem 0}

/* Hero */
.hero{padding:3.5rem 0 1rem}

.hero h1{margin:1rem 0 1.25rem}
.hero .summary{max-width:66ch}
.cta-row{display:flex;flex-wrap:wrap;gap:.75rem;margin:1.5rem 0 2.5rem}
.cta-row a{display:inline-flex;align-items:center;min-height:44px;padding:0 1rem;border:1px solid var(--ink);border-radius:3px;text-decoration:none;color:var(--ink);font-size:.95rem}
.cta-row a.primary{background:var(--teal);border-color:var(--teal);color:#fff}
.hero-figure .fig-body{max-width:760px}

/* Sections */
.beat{padding:3.5rem 0 1rem;border-top:1px solid var(--slate-tint);margin-top:2.5rem}
.beat-head{display:grid;grid-template-columns:1fr;gap:1rem;align-items:baseline;margin-bottom:1.75rem}

.body{max-width:66ch}
.body+.body{margin-top:1rem}
.beat>.body{margin-top:1.5rem}
.beat>.requirements{margin:.75rem 0 1.5rem}
.evidence-method pre+p{margin-top:.75rem}

.w880{max-width:880px}

/* Figures */
.fig{position:relative;margin:0 0 1.5rem}

.fig-body{padding:.5rem 0}
.fig-body svg{display:block;width:100%;height:auto}

.fig-wide{display:block}
.fig-compact{display:none}
figcaption{font-size:14px;line-height:1.5;color:var(--slate);max-width:78ch;margin-top:.5rem}
figcaption data,figcaption strong{color:var(--ink);font-weight:500}
figcaption a{color:var(--link)}

/* Details tables under data figures. */

.table-scroll{max-width:100%;overflow-x:auto;margin:.25rem 0 1rem}
table{width:100%;border-collapse:collapse;font-variant-numeric:tabular-nums;text-align:right;background:var(--slate-tint-2)}
caption{font-size:.8rem;text-align:left;padding:.6rem 0;color:var(--slate);line-height:1.5}
caption strong{color:var(--ink)}
th{font-weight:600}
thead th{padding:.6rem .6rem;border-bottom:1px solid var(--slate);font-size:.8rem;white-space:nowrap;text-align:right}
thead th:first-child,tbody th{text-align:left}
thead small{display:block;font-weight:400;color:var(--slate);font-size:.68rem;margin-top:.15rem}
tbody td,tbody th{border-bottom:1px solid var(--slate-tint);padding:.55rem .6rem;font-size:.86rem;white-space:nowrap}
tbody th>span,tbody th small{display:inline-block;margin-left:.5rem;font-size:.72rem;color:var(--slate);font-weight:400}
td.numeric{font-family:var(--mono)}
.unit{font-size:.7rem}
.ratio{font-weight:600}

/* Code and citation */
.code-grid{display:grid;grid-template-columns:1fr 1fr;gap:1.25rem}
.code-grid>*{min-width:0}
.code-grid h3{font-family:var(--sans);font-size:.92rem;font-weight:600;margin:0 0 .4rem}

.site-footer{display:flex;flex-wrap:wrap;justify-content:space-between;gap:.5rem 1.5rem;border-top:1px solid var(--slate-tint);padding:1.5rem 0;margin-top:3rem;font-size:.8rem;color:var(--slate)}
.site-footer a{color:var(--link)}

/* Evidence page (records) */
.evidence-main{padding-top:2.5rem}
.evidence-title h1{font-size:clamp(2rem,4vw,3rem)}
.evidence-title>p{max-width:70ch;margin-top:1rem;color:var(--slate)}

.evidence-method{border-top:1px solid var(--slate-tint);padding-top:2rem;margin-top:2.5rem}
.evidence-method h2{font-size:1.75rem;margin-bottom:1rem}
.evidence-method>p{max-width:78ch}

.result-figure{margin:1.5rem 0}
.result-figure>a{display:block;border:1px solid var(--slate-tint)}
.result-figure img{width:100%;height:auto}

.small{font-size:.86rem;color:var(--slate)}

.output-table td,.output-table th{font-size:.8rem}

/* Reduced motion: no smooth scrolling. */

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
}

@media (max-width: 960px){
  .code-grid{grid-template-columns:1fr}
}
@media (max-width: 720px){
  :root{--nav-h:48px}
  body{font-size:16px;line-height:1.6}
  .wrap{width:calc(100% - 32px)}
  h2.claim{font-size:1.4rem}
  .hero{padding-top:2rem}
  .cta-row{display:grid;grid-template-columns:1fr 1fr;gap:.6rem}
  .cta-row a{justify-content:center}
  .fig-wide{display:none}
  .fig-compact{display:block}
  .beat{padding-top:2.5rem;margin-top:2rem}
  .beat-head{margin-bottom:1rem}
  .nav-links{display:none}
  .site-nav{gap:.75rem}
  pre{font-size:.76rem;padding:.9rem 1rem}
  .site-footer{flex-direction:column}
}
@media print{
  body{background:#fff;color:#111;font-size:11pt}
  .wrap{width:100%;max-width:none}
  .site-nav,.site-footer,.skip-link,.cta-row{display:none}
  .fig{break-inside:avoid}
  .table-scroll{overflow:visible}
  a{color:#0b6f69}
  pre{white-space:pre-wrap;font-size:9pt}
}
.site-footer span a+a{margin-left:1rem}
.beat{padding-top:4rem}

/* Hero: the product name leads */
.hero{padding:4.5rem 0 1.5rem}
.hero h1{font-size:clamp(4.5rem,13vw,9rem);line-height:.9;letter-spacing:-.045em;margin:0 0 1rem;color:var(--ink)}
.hero .tagline{display:block;font-family:var(--serif);font-size:clamp(1.5rem,3vw,2.1rem);line-height:1.2;letter-spacing:-.02em;margin-top:.75rem;color:var(--ink);max-width:24ch}
.hero .summary{font-size:1.1rem;color:var(--slate);max-width:44ch;margin:0}
.hero .cta-row{margin:1.75rem 0 2.75rem}
.hero-figure figcaption{color:var(--slate)}
.wordmark{font-weight:600;letter-spacing:-.02em}
/* Mechanisms: two columns of figure cards */
.mechanisms{display:grid;grid-template-columns:1fr;gap:3.5rem}
@media (min-width: 960px){.mechanisms{grid-template-columns:1fr 1fr;gap:4rem 4.5rem}}
/* A card left alone in the last row spans both columns: text left, figure right. */
@media (min-width: 960px){
  .mech-wide{grid-column:1 / -1;display:grid;grid-template-columns:1fr 1fr;column-gap:4.5rem;align-items:start}
  .mech-wide>h3,.mech-wide>p{grid-column:1}
  .mech-wide>.fig-body,.mech-wide>figcaption{grid-column:2}
  .mech-wide>.fig-body{grid-row:1 / span 3}
}
.mech{margin:0}
.mech h3{font-size:1.45rem;margin:0 0 .4rem;line-height:1.2}
.mech p{color:var(--slate);margin:0 0 1.5rem;max-width:42ch}
.mech .fig-body{max-width:470px}
#fig-speed .fig-body{max-width:820px}
.nav-links a{color:var(--slate)}
.nav-links a:hover{color:var(--ink)}
@media (min-width: 1100px){.code-grid-3{grid-template-columns:1fr 1fr 1.25fr}}
.code-grid h3{margin-bottom:.4rem}