:root{
  --bg:#eef0f2;
  --bg-alt:#dfe3e7;
  --bg-dark:#1b2733;
  --text:#151a20;
  --muted:#636d78;
  --on-dark:#eef0f2;
  --accent:#2c4a7c;
  --accent2:#a35a2a;
  --serif:Georgia,'Times New Roman',serif;
  --sans:system-ui,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
  --maxw:1160px;
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:var(--sans);
  font-size:17px;
  line-height:1.72;
  overflow-x:hidden;
}
img{max-width:100%;height:auto;display:block}
a{color:var(--accent)}
a:focus-visible,button:focus-visible{
  outline:2px solid var(--accent);
  outline-offset:3px;
}

/* ---------- grid ---------- */
.wrap{
  width:100%;
  max-width:var(--maxw);
  margin:0 auto;
  padding:0 24px;
}
.grid{
  display:grid;
  grid-template-columns:repeat(12,1fr);
  gap:0 28px;
}

/* ---------- typography ---------- */
h1,h2,h3{font-family:var(--serif);font-weight:400;letter-spacing:.005em}
h1{font-size:clamp(2rem,4.4vw,3.1rem);line-height:1.2;margin:0}
h2{font-size:clamp(1.5rem,2.6vw,2.05rem);line-height:1.28;margin:0 0 .7em}
h3{font-size:1.22rem;font-style:italic;line-height:1.35;margin:0 0 .5em}
p{margin:0 0 1.15em}
.lead{font-size:1.09rem;color:#2a323b}
.meta{
  font-family:var(--sans);
  font-size:12px;
  letter-spacing:.19em;
  text-transform:uppercase;
  color:var(--muted);
}
.num{color:var(--accent2);font-family:var(--sans);font-size:12px;letter-spacing:.19em;text-transform:uppercase}
.muted{color:var(--muted)}

/* ---------- header ---------- */
.site-head{
  border-bottom:1px solid #c9d0d7;
  background:var(--bg);
}
.head-inner{
  display:flex;
  flex-wrap:wrap;
  gap:10px 26px;
  align-items:baseline;
  justify-content:center;
  padding:20px 24px;
  text-align:center;
}
.brand{
  font-family:var(--serif);
  font-size:1.32rem;
  letter-spacing:.05em;
  color:var(--text);
  text-decoration:none;
}
.brand span{color:var(--accent2)}
.site-nav ul{
  list-style:none;
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
  gap:4px 20px;
  margin:0;padding:0;
}
.site-nav a{
  font-size:13px;
  letter-spacing:.1em;
  text-transform:uppercase;
  text-decoration:none;
  color:var(--muted);
  padding:4px 0;
  border-bottom:1px solid transparent;
}
.site-nav a:hover,.site-nav a[aria-current="page"]{
  color:var(--accent);
  border-bottom-color:var(--accent);
}

/* ---------- axis / hero ---------- */
.hero{
  position:relative;
  padding:64px 0 80px;
  text-align:center;
}
.hero .wrap{position:relative}
.axis::before{
  content:"";
  position:absolute;
  left:50%;
  top:0;bottom:0;
  width:1px;
  background:linear-gradient(180deg,rgba(44,74,124,0),rgba(44,74,124,.45) 12%,rgba(44,74,124,.45) 88%,rgba(44,74,124,0));
  transform:translateX(-.5px);
  pointer-events:none;
}
.hero h1{max-width:15ch;margin:18px auto 0}
.hero-lead{
  grid-column:4 / span 6;
  margin-top:22px;
}
.hero-cols{
  margin-top:44px;
  row-gap:32px;
}
.hero-cols .side{font-size:.97rem}
.hero-cols .side:first-child{grid-column:2 / span 3;text-align:right}
.hero-cols .side:last-child{grid-column:9 / span 3;text-align:left}
.hero-cols .side p{margin:.4em 0 0;color:#333c46}

/* ---------- figures ---------- */
.fig-center{
  margin:56px auto 0;
  max-width:680px;
  text-align:center;
}
.fig-center img{margin:0 auto;border:1px solid #c9d0d7}
figcaption{
  margin-top:12px;
  font-size:13px;
  line-height:1.6;
  color:var(--muted);
}
figcaption b{color:var(--accent2);font-weight:400;letter-spacing:.14em;font-size:11px;text-transform:uppercase;display:block;margin-bottom:4px}

/* ---------- sections ---------- */
section{padding:80px 0}
section.tight{padding:64px 0}
section.wide{padding:96px 0}
.alt{background:var(--bg-alt)}
.dark{background:var(--bg-dark);color:var(--on-dark)}
.dark h2,.dark h3{color:var(--on-dark)}
.dark p{color:#c8d0d8}
.dark a{color:#9fb8dd}
.dark .meta{color:#8d9aa7}
.dark li::marker{color:#c2793f}

.sec-head{text-align:center;margin-bottom:40px}
.sec-head h2{margin-bottom:.35em}
.sec-head .num{display:block;margin-bottom:10px}

/* symmetric pair 4+4 */
.pair{row-gap:36px}
.pair>*:first-child{grid-column:2 / span 4}
.pair>*:last-child{grid-column:7 / span 4}

/* narrative asymmetry: 7 cols left */
.narrow7{grid-column:1 / span 7}
.centre6{grid-column:4 / span 6}
.centre8{grid-column:3 / span 8}

/* arc separator */
.arc{
  width:33.33%;
  min-width:220px;
  max-width:380px;
  height:26px;
  margin:0 auto;
  border-top:1px solid var(--accent2);
  border-left:1px solid rgba(163,90,42,.35);
  border-right:1px solid rgba(163,90,42,.35);
  border-radius:200px 200px 0 0;
}
.dark .arc{border-top-color:#c2793f;border-left-color:rgba(194,121,63,.4);border-right-color:rgba(194,121,63,.4)}

/* lists */
ul.check,ol.steps{padding-left:1.1em;margin:0 0 1.2em}
ul.check li,ol.steps li{margin-bottom:.55em}
ul.check li::marker{color:var(--accent)}
ol.steps li::marker{color:var(--accent2);font-family:var(--sans);font-size:.85em;letter-spacing:.1em}
dl.terms{margin:0}
dl.terms dt{font-family:var(--serif);font-style:italic;font-size:1.08rem;margin-top:1.1em}
dl.terms dd{margin:.2em 0 0;color:#333c46}

/* dark detail section */
.detail-row{row-gap:34px;align-items:start}
.detail-fig{grid-column:1 / span 5}
.detail-fig img{border:1px solid #33414f}
.detail-text{grid-column:7 / span 6}
.dark figcaption{color:#93a1ae}

/* table-free key/value blocks */
.block{
  border-top:1px solid #c1c9d1;
  padding-top:16px;
}
.dark .block{border-top-color:#33414f}
.block h3{margin-bottom:.35em}

/* ---------- footer ---------- */
.site-foot{
  background:var(--bg);
  padding:56px 0 48px;
  text-align:center;
  border-top:1px solid #c9d0d7;
}
.site-foot .arc{margin-bottom:26px}
.foot-name{font-family:var(--serif);font-size:1.3rem;letter-spacing:.05em;margin:0 0 16px}
.foot-nav ul{
  list-style:none;margin:0 0 18px;padding:0;
  display:flex;flex-wrap:wrap;justify-content:center;
  gap:6px 0;
}
.foot-nav li+li::before{content:"·";color:var(--accent2);margin:0 12px}
.foot-nav a{font-size:13px;letter-spacing:.08em;text-decoration:none;color:var(--muted)}
.foot-nav a:hover{color:var(--accent);text-decoration:underline}
.foot-mail{margin:0 0 10px}
.foot-note{
  max-width:56ch;margin:0 auto;
  font-size:13.5px;line-height:1.65;color:var(--muted);
}

/* ---------- responsive ---------- */
@media (max-width:900px){
  .grid{gap:0 20px}
  .hero-lead,.centre6,.centre8,.narrow7{grid-column:1 / span 12}
  .pair>*:first-child,.pair>*:last-child{grid-column:1 / span 12}
  .hero-cols .side:first-child,.hero-cols .side:last-child{grid-column:1 / span 12;text-align:left}
  .detail-fig,.detail-text{grid-column:1 / span 12}
  .detail-fig{max-width:420px}
}
@media (max-width:640px){
  body{font-size:16.5px}
  section{padding:48px 0}
  section.tight{padding:40px 0}
  section.wide{padding:56px 0}
  .hero{padding:40px 0 48px}
  .axis::before{display:none}
  .wrap{padding:0 18px}
  .fig-center{margin-top:36px}
  .site-nav ul{gap:4px 14px}
  .head-inner{padding:16px 18px}
}