/* Nagotralma — registration-marks */

:root{
  --bg:#eef0f2;
  --bg-alt:#dfe3e7;
  --bg-dark:#1b2733;
  --ink:#151a20;
  --ink-2:#636d78;
  --ink-inv:#eef0f2;
  --acc:#2c4a7c;
  --acc-2:#a35a2a;
  --step:84px;
  --gap:24px;
  --sans:system-ui,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
  --serif:Georgia,'Times New Roman',serif;
}

*{box-sizing:border-box;}

html{-webkit-text-size-adjust:100%;}

body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:var(--serif);
  font-size:18px;
  line-height:1.7;
  overflow-x:hidden;
}

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

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

.wrap{max-width:1180px;margin:0 auto;padding:0 24px;}

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

/* column logic: 7 columns, each block one column to the right, reset after the fourth */
.c1{grid-column:1 / span 7;}
.c2{grid-column:2 / span 7;}
.c3{grid-column:3 / span 7;}
.c4{grid-column:4 / span 7;}

h1,h2,h3{font-family:var(--sans);font-weight:800;color:var(--ink);}

h1{
  font-size:clamp(2.35rem,6vw,4.35rem);
  line-height:.98;
  letter-spacing:-.035em;
  margin:0;
}

h2{
  font-size:clamp(1.45rem,2.6vw,2rem);
  line-height:1.08;
  letter-spacing:-.02em;
  margin:0 0 18px;
}

h3{
  font-size:1.06rem;
  line-height:1.25;
  letter-spacing:-.01em;
  margin:26px 0 10px;
  text-transform:uppercase;
}

p{margin:0 0 20px;}
p:last-child{margin-bottom:0;}

.lead{font-size:1.12rem;}
.muted{color:var(--ink-2);}

.num{
  font-family:var(--sans);
  font-size:.72rem;
  font-weight:700;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--acc-2);
  display:block;
  margin:0 0 12px;
}

/* separators: two 2px offset lines */
.rule{border:0;margin:0 0 30px;padding:0;height:6px;position:relative;max-width:100%;}
.rule::before,.rule::after{content:"";position:absolute;left:0;height:2px;width:100%;}
.rule::before{top:0;background:var(--acc);}
.rule::after{top:4px;left:24px;width:calc(100% - 24px);background:var(--acc-2);}

/* registration marks */
.mark{position:absolute;width:22px;height:22px;}
.mark::before,.mark::after{content:"";position:absolute;background:var(--acc);}
.mark::before{left:0;top:10px;width:22px;height:1px;}
.mark::after{top:0;left:10px;width:1px;height:22px;}
.mark.tl{top:-11px;left:-11px;}
.mark.tr{top:-11px;right:-11px;}
.mark.bl{bottom:-11px;left:-11px;}
.mark.br{bottom:-11px;right:-11px;}
.mark.copper::before,.mark.copper::after{background:var(--acc-2);}

/* header / navigation */
.site-head{border-bottom:2px solid var(--acc);background:var(--bg);}
.site-head .wrap{display:flex;flex-wrap:wrap;align-items:baseline;gap:14px 30px;padding-top:20px;padding-bottom:16px;}
.brand{
  font-family:var(--sans);font-weight:800;font-size:1.12rem;
  letter-spacing:-.02em;text-transform:uppercase;color:var(--ink);
  text-decoration:none;
}
.brand:hover{text-decoration:none;color:var(--acc);}
.site-nav ul{list-style:none;display:flex;flex-wrap:wrap;gap:6px 22px;margin:0;padding:0;}
.site-nav a{
  font-family:var(--sans);font-size:.83rem;font-weight:600;
  letter-spacing:.06em;text-transform:uppercase;text-decoration:none;color:var(--ink-2);
  padding-bottom:2px;border-bottom:2px solid transparent;
}
.site-nav a:hover,.site-nav a[aria-current="page"]{color:var(--ink);border-bottom-color:var(--acc);}
.site-nav{margin-left:auto;}

/* sections */
.sec{padding:var(--step) 0;}
.sec-alt{background:var(--bg-alt);}
.sec-dark{background:var(--bg-dark);color:var(--ink-inv);}
.sec-dark h2,.sec-dark h3{color:var(--ink-inv);}
.sec-dark .muted{color:#a9b4c0;}
.sec-dark a{color:#c8a882;}
.sec-dark .rule::before{background:#5c7fb8;}
.sec-dark .mark::before,.sec-dark .mark::after{background:#5c7fb8;}

/* hero */
.hero{padding:calc(var(--step) - 10px) 0 var(--step);}
.hero-frame{position:relative;padding:26px 0;}
.hero h1{grid-column:1 / span 9;}
.hero h1 .l2{position:relative;display:inline-block;}
.hero h1 .l2::after{
  content:"";position:absolute;left:-4px;right:-4px;bottom:.22em;
  height:3px;background:var(--acc);transform:translateY(6px);
}
.hero-body{margin-top:44px;row-gap:34px;}
.hero-body .intro{grid-column:1 / span 5;}
.hero-body .topics{grid-column:8 / span 4;}
.topics ul{list-style:none;margin:0;padding:0;font-family:var(--sans);font-size:.94rem;line-height:1.45;}
.topics li{position:relative;padding-left:20px;margin-bottom:12px;color:var(--ink-2);}
.topics li::before{content:"";position:absolute;left:0;top:.52em;width:8px;height:8px;background:var(--acc);}

/* main figure */
.fig-main{grid-column:3 / span 8;position:relative;margin:0;}
.fig-main .shot{position:relative;}
.fig-main img{width:100%;}
figcaption{
  font-family:var(--sans);font-size:.8rem;line-height:1.45;
  color:var(--ink-2);margin-top:14px;max-width:46ch;
}
figcaption b{color:var(--acc-2);font-weight:700;letter-spacing:.1em;text-transform:uppercase;font-size:.72rem;display:block;margin-bottom:4px;}

/* text blocks */
.block{margin-bottom:64px;}
.block:last-child{margin-bottom:0;}

.checklist{list-style:none;margin:22px 0 0;padding:0;}
.checklist li{position:relative;padding-left:26px;margin-bottom:12px;font-size:.98rem;line-height:1.6;}
.checklist li::before{content:"";position:absolute;left:0;top:.55em;width:10px;height:2px;background:var(--acc-2);}
.checklist li::after{content:"";position:absolute;left:4px;top:calc(.55em - 4px);width:2px;height:10px;background:var(--acc-2);}

ol.steps{margin:22px 0 0;padding-left:1.2em;}
ol.steps li{margin-bottom:10px;font-size:.98rem;line-height:1.6;}
ol.steps li::marker{font-family:var(--sans);font-weight:800;color:var(--acc-2);}

/* dark section with detail image */
.detail-grid{row-gap:40px;align-items:start;}
.fig-detail{grid-column:1 / span 5;position:relative;margin:0;}
.fig-detail img{width:100%;}
.fig-detail figcaption{color:#a9b4c0;}
.fig-detail figcaption b{color:#c8a882;}
.detail-text{grid-column:7 / span 6;}

/* about page */
.about-body .about-block{grid-column:3 / span 7;position:relative;margin-bottom:56px;}
.about-body .about-block:last-child{margin-bottom:0;}
.about-body .about-block::before{
  content:"";position:absolute;left:-46px;top:8px;width:18px;height:18px;
  background:
    linear-gradient(var(--acc-2),var(--acc-2)) center/18px 1px no-repeat,
    linear-gradient(var(--acc-2),var(--acc-2)) center/1px 18px no-repeat;
}

/* legal pages */
.doc{grid-column:2 / span 8;}
.doc h2{margin-top:44px;}
.doc h2:first-of-type{margin-top:0;}
.doc ul{padding-left:1.2em;}
.doc li{margin-bottom:9px;}

.page-head{padding:56px 0 0;}
.page-head h1{grid-column:1 / span 9;font-size:clamp(2rem,4.4vw,3.2rem);}
.page-head .kicker{grid-column:1 / span 9;}

/* footer */
.site-foot{background:var(--bg-dark);color:var(--ink-inv);padding:var(--step) 0 56px;}
.site-foot .rule{margin-bottom:38px;}
.site-foot .rule::before{background:#5c7fb8;}
.foot-grid{row-gap:34px;}
.foot-a{grid-column:1 / span 7;}
.foot-b{grid-column:8 / span 5;}
.foot-name{font-family:var(--sans);font-weight:800;font-size:1.3rem;letter-spacing:-.02em;text-transform:uppercase;margin:0 0 12px;}
.foot-a p{color:#a9b4c0;font-size:.98rem;max-width:52ch;}
.foot-b ul{list-style:none;margin:0 0 18px;padding:0;}
.foot-b li{margin-bottom:9px;}
.foot-b a{font-family:var(--sans);font-size:.88rem;color:var(--ink-inv);text-decoration:none;border-bottom:1px solid #5c7fb8;}
.foot-b a:hover{border-bottom-color:#c8a882;}
.foot-mail{font-family:var(--sans);font-size:.95rem;color:#c8a882;}
.foot-note{margin-top:44px;font-family:var(--sans);font-size:.76rem;letter-spacing:.05em;color:#8794a2;}

@media (max-width:900px){
  .hero-body .intro,.hero-body .topics,.fig-main,.fig-detail,.detail-text,
  .c1,.c2,.c3,.c4,.doc,.about-body .about-block,.foot-a,.foot-b,.hero h1,.page-head h1,.page-head .kicker{
    grid-column:1 / -1;
  }
  .about-body .about-block::before{left:0;top:-30px;}
  .about-body .about-block{padding-top:6px;}
}

@media (max-width:680px){
  :root{--step:50px;--gap:16px;}
  body{font-size:17px;}
  .wrap{padding:0 18px;}
  .site-nav{margin-left:0;width:100%;}
  .site-nav ul{gap:6px 16px;}
  .block{margin-bottom:44px;}
  .about-body .about-block{margin-bottom:44px;}
  .rule::after{left:16px;width:calc(100% - 16px);}
  .hero h1 .l2::after{height:2px;}
}