:root{
  --bg:#EAF6F5;
  --fg:#0B2A2B;
  --accent:#0D8C8C;
  --rule:#0B2A2B;
  --muted:#4a6a6b;
  --maxw:1240px;
}

*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--fg);}
body{
  font-family:'Work Sans', system-ui, sans-serif;
  font-weight:400;
  font-size:17px;
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
}

a{color:var(--fg);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px;}
a:hover{color:var(--accent);}

h1,h2,h3,h4{
  font-family:'Libre Baskerville', serif;
  font-weight:700;
  line-height:1.12;
  letter-spacing:-0.01em;
  margin:0 0 0.6em;
}
h1{font-size:clamp(2rem, 5.2vw, 4.2rem);}
h2{font-size:clamp(1.6rem, 3.2vw, 2.4rem);}
h3{font-size:1.2rem;}
h4{font-size:1.1rem;}

p{margin:0 0 1em;}

ul,ol{margin:0 0 1em;padding-left:1.2em;}
li{margin-bottom:0.35em;}
ul.plain{list-style:none;padding:0;}
ul.plain li{margin-bottom:0.3em;}

code{
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size:0.92em;
  background:rgba(13,140,140,0.10);
  padding:1px 5px;
  border-radius:2px;
}
.slab.alt code,.service.alt code{background:rgba(234,246,245,0.12);color:var(--bg);}

.wrap{
  max-width:var(--maxw);
  margin:0 auto;
  padding:0 32px;
}

/* Masthead */
.masthead{
  border-bottom:2px solid var(--rule);
  padding:18px 0 0;
  position:sticky;
  top:0;
  background:var(--bg);
  z-index:10;
}
.masthead .wrap{display:flex;justify-content:space-between;align-items:baseline;gap:24px;flex-wrap:wrap;}
.masthead .wrap.ticker{
  display:block;
  border-top:1px dashed var(--rule);
  margin-top:14px;
  padding-top:8px;
  padding-bottom:8px;
}
.ticker p{
  margin:0;
  font-size:0.72rem;
  letter-spacing:0.06em;
  color:var(--muted);
  font-family:'Work Sans', sans-serif;
  white-space:nowrap;
  overflow-x:auto;
}
.tick-label{
  color:var(--accent);
  font-weight:600;
  text-transform:uppercase;
  letter-spacing:0.16em;
  margin-right:6px;
}
.mark{
  font-family:'Libre Baskerville', serif;
  font-weight:700;
  letter-spacing:0.08em;
  font-size:0.95rem;
}
.masthead nav{display:flex;gap:22px;flex-wrap:wrap;}
.masthead nav a{
  text-decoration:none;
  text-transform:uppercase;
  letter-spacing:0.12em;
  font-size:0.78rem;
  font-weight:500;
  border-bottom:1px solid transparent;
  padding-bottom:2px;
}
.masthead nav a:hover,
.masthead nav a[aria-current]{border-bottom-color:var(--accent);color:var(--accent);}

/* Hero */
.hero{
  position:relative;
  min-height:92vh;
  border-bottom:2px solid var(--rule);
  display:flex;
  align-items:flex-end;
  overflow:hidden;
  background:#071D1E;
}
.hero-art{position:absolute;inset:0;}
.hero-art svg{width:100%;height:100%;display:block;}
.hero-text{
  position:relative;
  z-index:2;
  padding:60px 32px 70px;
  max-width:var(--maxw);
  width:100%;
  margin:0 auto;
  color:#EAF6F5;
}
.hero-text .kicker{
  font-family:'Work Sans', sans-serif;
  text-transform:uppercase;
  letter-spacing:0.2em;
  font-size:0.72rem;
  margin-bottom:20px;
  color:#EAF6F5;
  opacity:0.85;
}
.hero-text h1{
  color:#EAF6F5;
  max-width:16ch;
  margin-bottom:24px;
}
.hero-text .serifnum{font-style:italic;color:#EAF6F5;}
.hero-text .lede{
  max-width:56ch;
  font-size:clamp(1rem, 1.4vw, 1.2rem);
  color:#EAF6F5;
  opacity:0.92;
}

/* Generic page hero */
.page-hero{
  border-bottom:2px solid var(--rule);
  padding:80px 0 64px;
}
.page-hero h1{max-width:20ch;}
.page-hero .lede{max-width:64ch;font-size:1.15rem;}
.page-hero .annotation{
  display:inline-block;
  transform:rotate(-1.4deg);
  border-left:3px solid var(--accent);
  padding:4px 10px;
  margin-top:14px;
  font-style:italic;
  color:var(--muted);
  font-size:0.95rem;
}
.fourohfour{min-height:60vh;display:flex;align-items:center;}

.backlink{
  display:inline-block;
  margin-top:14px;
  font-weight:500;
  color:var(--accent);
}

/* Slabs */
.slab{border-bottom:2px solid var(--rule);padding:70px 0;}
.slab.alt{background:var(--fg);color:var(--bg);}
.slab.alt a{color:var(--bg);}
.slab.alt a:hover{color:#7fd3d3;}
.slab.alt h1,.slab.alt h2,.slab.alt h3,.slab.alt h4{color:var(--bg);}

.label{
  font-family:'Work Sans', sans-serif;
  text-transform:uppercase;
  letter-spacing:0.2em;
  font-size:0.72rem;
  font-weight:600;
  color:var(--accent);
  margin-bottom:16px;
}
.slab.alt .label,.service.alt .label{color:#7fd3d3;}

.big{
  font-family:'Libre Baskerville', serif;
  font-size:clamp(1.3rem, 2.2vw, 1.8rem);
  line-height:1.3;
  margin-bottom:0.8em;
}

.aside{
  border-top:1px solid currentColor;
  padding-top:14px;
  margin-top:22px;
  font-size:0.95rem;
  color:var(--muted);
}

.two{display:grid;grid-template-columns:1fr 2fr;gap:56px;align-items:start;}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:40px;margin-top:32px;}
.grid2{display:grid;grid-template-columns:repeat(2,1fr);gap:40px;margin-top:24px;}

.grid3 article,.grid2 article{
  border-top:2px solid currentColor;
  padding-top:18px;
}

/* Cases */
.case{
  border-top:1px solid var(--rule);
  padding:32px 0;
  display:grid;
  grid-template-columns:220px 1fr;
  gap:48px;
  align-items:start;
}
.case:last-child{border-bottom:1px solid var(--rule);}
.case-meta p{
  font-family:'Work Sans', sans-serif;
  letter-spacing:0.14em;
  text-transform:uppercase;
  font-size:0.72rem;
  font-weight:600;
  margin:0 0 6px;
  color:var(--accent);
}
.case-body h4{margin-bottom:12px;font-size:1.25rem;line-height:1.3;}

/* Principles */
.principles{list-style:none;padding:0;counter-reset:p;}
.principles li{
  counter-increment:p;
  border-top:1px solid currentColor;
  padding:18px 0 18px 3.2em;
  position:relative;
}
.principles li::before{
  content:counter(p,decimal-leading-zero);
  position:absolute;
  left:0;top:18px;
  font-family:'Libre Baskerville', serif;
  font-weight:700;
  font-size:1.1rem;
  color:var(--accent);
}
.slab.alt .principles li::before{color:#7fd3d3;}

/* Services page */
.service{border-bottom:2px solid var(--rule);padding:70px 0;}
.service.alt{background:var(--fg);color:var(--bg);}
.service.alt h2,.service.alt h3{color:var(--bg);}
.service .bignum{
  font-family:'Libre Baskerville', serif;
  font-weight:700;
  font-size:clamp(5rem, 12vw, 9rem);
  line-height:1;
  color:var(--accent);
  margin:0 0 20px;
}
.service.alt .bignum{color:#7fd3d3;}
.trackglyph{
  width:140px;
  height:140px;
  color:var(--accent);
  display:block;
}
.service.alt .trackglyph{color:#7fd3d3;}

.bio{padding-top:18px;}
.bio .role{
  font-size:0.85rem;
  letter-spacing:0.08em;
  text-transform:uppercase;
  color:var(--accent);
  margin-bottom:10px;
}
.slab.alt .bio .role{color:#7fd3d3;}

/* Week list */
.week{list-style:none;padding:0;}
.week li{
  border-top:1px solid currentColor;
  padding:12px 0;
}
.week li:last-child{border-bottom:1px solid currentColor;}

/* TOC layout (field notes) */
.toc-layout{
  display:grid;
  grid-template-columns:260px 1fr;
  gap:60px;
  max-width:var(--maxw);
  margin:0 auto;
  padding:60px 32px 40px;
}
.toc{
  position:sticky;
  top:120px;
  align-self:start;
  border-top:2px solid var(--rule);
  padding-top:16px;
}
.toc-list{
  list-style:none;
  padding:0;
  margin:0 0 18px;
  counter-reset:toc;
}
.toc-list li{
  counter-increment:toc;
  border-bottom:1px dotted var(--rule);
  padding:8px 0;
  font-size:0.92rem;
  line-height:1.35;
}
.toc-list li a{text-decoration:none;}
.toc-list li a:hover{color:var(--accent);}
.toc-note{
  font-size:0.8rem;
  color:var(--muted);
  font-style:italic;
}
.toc-body{min-width:0;}

.note{
  border-top:2px solid var(--rule);
  padding:40px 0;
  max-width:68ch;
}
.note:last-child{border-bottom:2px solid var(--rule);}
.note-meta{
  font-family:'Work Sans', sans-serif;
  text-transform:uppercase;
  letter-spacing:0.18em;
  font-size:0.72rem;
  font-weight:600;
  color:var(--accent);
  margin-bottom:12px;
}
.note h2{font-size:clamp(1.4rem, 2.4vw, 1.8rem);}
.takeaway{
  border-left:3px solid var(--accent);
  padding:8px 0 8px 14px;
  margin-top:10px;
  background:rgba(13,140,140,0.06);
  font-size:0.95rem;
}

/* Codeblock */
.codeblock{
  border:1px solid var(--rule);
  background:rgba(13,140,140,0.06);
  padding:18px 20px;
  overflow-x:auto;
  margin:18px 0;
}
.slab.alt .codeblock{
  background:rgba(234,246,245,0.08);
  border-color:#7fd3d3;
}
.codeblock pre{
  margin:0;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size:0.88rem;
  line-height:1.5;
  white-space:pre;
}
.codeblock .c{color:var(--accent);}
.slab.alt .codeblock .c{color:#7fd3d3;}
.codeblock.small pre{font-size:0.82rem;}

/* First-15 list */
.fifteen{list-style:none;padding:0;counter-reset:f;}
.fifteen li{
  counter-increment:f;
  padding:12px 0 12px 3em;
  border-top:1px solid var(--rule);
  position:relative;
}
.fifteen li:last-child{border-bottom:1px solid var(--rule);}
.fifteen li::before{
  content:counter(f,decimal-leading-zero);
  position:absolute;
  left:0;top:12px;
  font-family:'Libre Baskerville', serif;
  font-weight:700;
  color:var(--accent);
}

/* SLO table */
.slo-table{
  width:100%;
  border-collapse:collapse;
  margin:18px 0;
  font-size:0.92rem;
}
.slo-table th,.slo-table td{
  text-align:left;
  padding:10px 12px;
  border-bottom:1px solid currentColor;
  vertical-align:top;
}
.slo-table th{
  font-family:'Work Sans', sans-serif;
  text-transform:uppercase;
  letter-spacing:0.14em;
  font-size:0.72rem;
  font-weight:600;
  color:var(--accent);
  border-bottom:2px solid currentColor;
}
.slab.alt .slo-table th{color:#7fd3d3;}

/* Glossary */
.glossary{margin:0;}
.glossary dt{
  font-family:'Libre Baskerville', serif;
  font-weight:700;
  margin-top:14px;
  font-size:1.02rem;
}
.glossary dd{
  margin:4px 0 0;
  padding-left:0;
  color:inherit;
}

/* Footer */
footer{
  background:var(--fg);
  color:var(--bg);
  padding:60px 0 28px;
}
footer a{color:var(--bg);}
footer a:hover{color:#7fd3d3;}
footer .label{color:#7fd3d3;}
.foot{
  display:grid;
  grid-template-columns:1.3fr 1fr 1.3fr;
  gap:48px;
  padding-bottom:40px;
  border-bottom:1px solid #7fd3d3;
  margin-bottom:20px;
}
.foot p{margin-bottom:0.6em;}
.tended{
  font-size:0.82rem;
  color:#7fd3d3;
  letter-spacing:0.04em;
  font-style:italic;
}
.copy{
  font-size:0.8rem;
  letter-spacing:0.08em;
  text-transform:uppercase;
  opacity:0.8;
  margin:0;
}

/* Responsive */
@media (max-width: 1000px){
  .toc-layout{grid-template-columns:1fr;gap:32px;padding:40px 24px;}
  .toc{position:static;top:auto;}
}
@media (max-width: 900px){
  .two{grid-template-columns:1fr;gap:24px;}
  .grid3{grid-template-columns:1fr;gap:28px;}
  .grid2{grid-template-columns:1fr;gap:28px;}
  .case{grid-template-columns:1fr;gap:16px;}
  .foot{grid-template-columns:1fr;gap:32px;}
  .hero{min-height:80vh;}
  .hero-text{padding:40px 24px 48px;}
  .masthead nav{gap:14px;}
  .wrap{padding:0 22px;}
  .slab,.service{padding:52px 0;}
  .page-hero{padding:56px 0 44px;}
  .trackglyph{width:100px;height:100px;}
}

@media (max-width: 500px){
  body{font-size:16px;}
  .masthead .wrap{flex-direction:column;align-items:flex-start;gap:12px;}
  .masthead nav{gap:14px 18px;}
  .ticker p{font-size:0.68rem;}
  .slo-table{font-size:0.85rem;}
  .slo-table th,.slo-table td{padding:8px 6px;}
}