/* Tuvaranesol — mirror-axis */

:root{
  --bg:#e8e6e1;
  --bg-alt:#d3d0c9;
  --bg-dark:#2a2a28;
  --ink:#17171a;
  --ink-soft:#6a6862;
  --ink-invert:#e8e6e1;
  --rust:#8c4a2f;
  --steel:#55707a;
  --maxw:1140px;
}

*{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:system-ui,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
  font-size:17px;
  line-height:1.7;
  overflow-x:hidden;
}

img{max-width:100%;height:auto;display:block;}

a{color:var(--rust);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px;}
a:hover{text-decoration-thickness:2px;}
a:focus-visible,
:focus-visible{outline:2px solid var(--rust);outline-offset:3px;}

/* ---------- layout ---------- */

.wrap{
  width:100%;
  max-width:var(--maxw);
  margin:0 auto;
  padding:0 24px;
}

.grid{
  display:grid;
  grid-template-columns:repeat(12,1fr);
  column-gap:24px;
}

/* vertical mirror axis */
.axis{position:relative;}
.axis::before{
  content:"";
  position:absolute;
  top:0;
  bottom:0;
  left:50%;
  width:1px;
  background:var(--rust);
  opacity:.45;
}

/* ---------- header / nav ---------- */

.site-head{
  border-bottom:1px solid rgba(23,23,26,.14);
  background:var(--bg);
}
.head-inner{
  display:flex;
  flex-wrap:wrap;
  gap:12px 28px;
  align-items:baseline;
  justify-content:space-between;
  padding-top:20px;
  padding-bottom:20px;
}
.brand{
  font-size:19px;
  font-weight:700;
  letter-spacing:.06em;
  text-transform:uppercase;
  color:var(--ink);
  text-decoration:none;
}
.brand:hover{color:var(--rust);}
.site-nav ul{
  list-style:none;
  display:flex;
  flex-wrap:wrap;
  gap:6px 22px;
  margin:0;
  padding:0;
}
.site-nav a{
  font-size:14px;
  letter-spacing:.03em;
  color:var(--ink);
  text-decoration:none;
  padding-bottom:2px;
  border-bottom:1px solid transparent;
}
.site-nav a:hover,
.site-nav a[aria-current="page"]{
  color:var(--rust);
  border-bottom-color:var(--rust);
}

/* ---------- sections rhythm ---------- */

.s-a{padding:64px 0;}
.s-b{padding:80px 0;}
.s-c{padding:96px 0;}
.tint{background:var(--bg-alt);}
.dark{background:var(--bg-dark);color:var(--ink-invert);}
.dark h2,.dark h3{color:var(--ink-invert);}
.dark .num{color:#9fb6bd;}
.dark .cap{color:#a8a59d;}
.dark a{color:#d9a58c;}

/* ---------- typography ---------- */

h1{
  font-size:clamp(38px,6.2vw,74px);
  line-height:1.02;
  letter-spacing:-.035em;
  font-weight:700;
  margin:0;
}
h2{
  font-size:clamp(23px,2.6vw,31px);
  line-height:1.2;
  letter-spacing:-.015em;
  font-weight:600;
  margin:0 0 18px;
}
h3{
  font-size:19px;
  line-height:1.35;
  font-weight:600;
  margin:32px 0 10px;
}
p{margin:0 0 18px;}
.lead{font-size:19px;}
.num{
  display:block;
  font-size:13px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--steel);
  margin-bottom:14px;
}
.cap{
  font-size:13px;
  line-height:1.55;
  color:var(--ink-soft);
  margin:14px 0 0;
}
.kicker{
  font-size:13px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--steel);
}

/* ---------- hero ---------- */

.hero{padding:72px 0 64px;}
.hero-inner{position:relative;}
.hero-inner::before{
  content:"";
  position:absolute;
  top:0;
  bottom:0;
  left:50%;
  width:1px;
  background:var(--rust);
  opacity:.5;
}
.hero .kicker{text-align:center;display:block;margin-bottom:24px;}
.hero h1{text-align:center;max-width:15ch;margin:0 auto;}
.hero-lead{
  grid-column:4 / span 6;
  text-align:center;
  margin-top:28px;
  font-size:19px;
  color:var(--ink);
}
.hero-side{margin-top:44px;}
.hero-side .side-l{grid-column:2 / span 3;}
.hero-side .side-r{grid-column:9 / span 3;}
.hero-side p{font-size:15px;color:var(--ink-soft);margin:0;}
.hero-side .num{margin-bottom:8px;}

/* ---------- figures ---------- */

.fig-center{
  margin:56px auto 0;
  max-width:680px;
  text-align:center;
}
.fig-center img{width:100%;}
.fig-center figcaption{
  font-size:13px;
  color:var(--ink-soft);
  margin-top:12px;
  text-align:center;
}

/* ---------- separator arc ---------- */

.arc{
  width:100%;
  max-width:340px;
  height:26px;
  margin:0 auto;
  border-top:1px solid var(--steel);
  border-radius:170px 170px 0 0;
  opacity:.7;
}
.arc-rust{border-top-color:var(--rust);}

/* ---------- symmetric pair ---------- */

.pair{margin-top:38px;row-gap:38px;}
.pair > div:first-child{grid-column:2 / span 4;}
.pair > div:last-child{grid-column:7 / span 4;}

.centered-head{text-align:center;margin-bottom:8px;}
.centered-text{grid-column:4 / span 6;}

/* narrative asymmetry */
.narrow-left{grid-column:1 / span 7;}

/* lists */
ul.check,ul.plain{padding-left:0;list-style:none;margin:0 0 18px;}
ul.check li,ul.plain li{
  position:relative;
  padding-left:22px;
  margin-bottom:10px;
}
ul.check li::before{
  content:"";
  position:absolute;
  left:0;
  top:11px;
  width:9px;
  height:1px;
  background:var(--rust);
}
ol.steps{padding-left:22px;margin:0 0 18px;}
ol.steps li{margin-bottom:10px;padding-left:4px;}
ol.steps li::marker{color:var(--steel);font-size:14px;}

/* dark detail section */
.detail-block{align-items:start;row-gap:32px;}
.detail-fig{grid-column:1 / span 5;margin:0;}
.detail-fig img{width:100%;}
.detail-text{grid-column:7 / span 6;}

/* definition rows */
.rows{border-top:1px solid rgba(23,23,26,.16);margin-top:26px;}
.rows div{
  display:grid;
  grid-template-columns:minmax(150px,3fr) 7fr;
  gap:8px 28px;
  padding:16px 0;
  border-bottom:1px solid rgba(23,23,26,.16);
}
.rows dt,.rows .t{font-weight:600;}
.rows dd{margin:0;}
.dark .rows{border-top-color:rgba(232,230,225,.25);}
.dark .rows div{border-bottom-color:rgba(232,230,225,.25);}

/* ---------- footer ---------- */

.site-foot{
  background:var(--bg);
  padding:56px 0 48px;
  border-top:1px solid rgba(23,23,26,.14);
  text-align:center;
}
.site-foot .arc{margin-bottom:28px;}
.foot-name{
  font-size:17px;
  font-weight:700;
  letter-spacing:.08em;
  text-transform:uppercase;
  margin:0 0 18px;
}
.foot-nav ul{
  list-style:none;
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
  gap:6px 0;
  margin:0 0 20px;
  padding:0;
  font-size:14px;
}
.foot-nav li + li::before{
  content:"·";
  color:var(--steel);
  padding:0 12px;
}
.foot-nav a{color:var(--ink);text-decoration:none;}
.foot-nav a:hover{color:var(--rust);text-decoration:underline;}
.foot-mail{margin:0 0 10px;font-size:15px;}
.foot-note{
  margin:0 auto;
  max-width:56ch;
  font-size:13px;
  color:var(--ink-soft);
}

/* ---------- inner pages ---------- */

.page-head{padding:64px 0 8px;text-align:center;}
.page-head h1{font-size:clamp(32px,4.6vw,52px);}
.page-head .kicker{display:block;margin-bottom:18px;}
.doc{grid-column:3 / span 8;}
.doc h2{margin-top:44px;}
.doc h2:first-of-type{margin-top:0;}

/* ---------- responsive ---------- */

@media (max-width:900px){
  .hero-lead,.centered-text,.doc{grid-column:1 / -1;}
  .pair > div:first-child,
  .pair > div:last-child{grid-column:1 / -1;}
  .hero-side .side-l,.hero-side .side-r{grid-column:1 / -1;}
  .narrow-left{grid-column:1 / -1;}
  .detail-fig,.detail-text{grid-column:1 / -1;}
  .detail-fig{max-width:420px;}
  .hero-inner::before,.axis::before{display:none;}
  .s-a,.s-b,.s-c{padding:48px 0;}
  .hero{padding:44px 0 40px;}
  .page-head{padding:44px 0 4px;}
}

@media (max-width:560px){
  body{font-size:16px;}
  .wrap{padding:0 18px;}
  .s-a,.s-b,.s-c{padding:40px 0;}
  .head-inner{flex-direction:column;align-items:flex-start;}
  .site-nav ul{gap:6px 16px;}
  .rows div{grid-template-columns:1fr;}
  .fig-center{margin-top:36px;}
  .hero-side{margin-top:32px;row-gap:24px;display:grid;}
}