/* Pristadu — rail-scale */

:root{
  --bg:#f4f5f7;
  --bg-alt:#ffffff;
  --bg-dark:#23262b;
  --ink:#16181d;
  --ink-2:#656b75;
  --ink-inv:#f4f5f7;
  --acc:#2d5bd6;
  --acc-2:#c9a00f;
  --line:#d8dbe1;
  --mono:ui-monospace,Consolas,'Liberation Mono',monospace;
  --sans:system-ui,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
  --step:80px;
}

*,*::before,*::after{box-sizing:border-box}

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

body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:var(--sans);
  font-size:17px;
  line-height:1.75;
  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}

:focus-visible{outline:2px solid var(--acc);outline-offset:3px}

/* ---------- grid ---------- */

.grid{
  max-width:1240px;
  margin:0 auto;
  padding:0 28px;
  display:grid;
  grid-template-columns:repeat(12,1fr);
  column-gap:24px;
}

.rail{grid-column:1 / 3}
.body-col{grid-column:3 / 10}
.wide-col{grid-column:3 / 12}

/* ---------- rail marker + scale ---------- */

.rail-mark{
  font-family:var(--mono);
  font-size:12px;
  line-height:1.5;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--ink-2);
  padding-top:6px;
}
.rail-mark b{display:block;color:var(--acc-2);font-weight:400}

.rail-scale{
  margin-top:14px;
  height:120px;
  width:100%;
  background-image:repeating-linear-gradient(to bottom,var(--line) 0 1px,transparent 1px 12px);
  background-size:18px 100%;
  background-repeat:no-repeat;
}

.rail-scale.tall{height:220px}

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

.site-header{
  border-bottom:1px solid var(--line);
  background:var(--bg-alt);
}
.site-header .grid{align-items:center;padding-top:18px;padding-bottom:18px}

.brand{
  grid-column:1 / 4;
  font-family:var(--mono);
  font-size:16px;
  letter-spacing:.28em;
  text-transform:uppercase;
  color:var(--ink);
  text-decoration:none;
  font-weight:700;
}
.brand:hover{color:var(--acc)}

.site-nav{grid-column:4 / 13;display:flex;flex-wrap:wrap;gap:8px 26px;justify-content:flex-end}
.site-nav a{
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--ink-2);
  text-decoration:none;
  padding:4px 0;
  border-bottom:1px solid transparent;
}
.site-nav a:hover,.site-nav a[aria-current="page"]{color:var(--ink);border-bottom-color:var(--acc)}

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

.sec{padding:var(--step) 0;background:var(--bg)}
.sec.alt{background:var(--bg-alt)}
.sec.dark{background:var(--bg-dark);color:var(--ink-inv)}
.sec.dark .rail-mark{color:#9aa1ad}
.sec.dark .rail-scale{background-image:repeating-linear-gradient(to bottom,#3d434c 0 1px,transparent 1px 12px)}
.sec.dark a{color:#8fb0ff}
.sec.dark .cap{color:#9aa1ad}

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

h1,h2,h3{font-family:var(--mono);text-transform:uppercase;font-weight:700;margin:0}
h1{
  grid-column:3 / 10;
  font-size:clamp(28px,3.4vw,44px);
  line-height:1.18;
  letter-spacing:.02em;
}
h2{
  font-size:clamp(19px,2vw,25px);
  line-height:1.3;
  letter-spacing:.06em;
  margin-bottom:20px;
}
h3{
  font-size:15px;
  line-height:1.4;
  letter-spacing:.12em;
  margin:34px 0 10px;
  color:var(--ink);
}
.sec.dark h2,.sec.dark h3{color:var(--ink-inv)}

p{margin:0 0 18px}
p:last-child{margin-bottom:0}

.lead{font-size:19px;line-height:1.7;color:var(--ink-2)}

.cap{
  font-family:var(--mono);
  font-size:11.5px;
  letter-spacing:.1em;
  line-height:1.6;
  color:var(--ink-2);
  text-transform:uppercase;
}

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

.hero{padding:calc(var(--step) + 16px) 0 var(--step);background:var(--bg)}
.hero .rail{grid-column:1 / 3}
.hero-sub{grid-column:3 / 9;margin-top:26px}

.hero .rail-scale{height:200px}

/* ---------- ticks separator ---------- */

.ticks{
  grid-column:1 / 13;
  height:24px;
  margin-bottom:44px;
  background-image:repeating-linear-gradient(to right,var(--line) 0 1px,transparent 1px 16px);
}
.sec.dark .ticks{background-image:repeating-linear-gradient(to right,#3d434c 0 1px,transparent 1px 16px)}

/* ---------- main figure ---------- */

.fig-main{grid-column:4 / 13;margin:0}
.fig-main img{width:100%;height:auto;border:1px solid var(--line)}
.fig-side{grid-column:1 / 4;align-self:end;padding-bottom:6px}

/* ---------- lists ---------- */

.checklist{
  grid-column:3 / 12;
  list-style:none;
  margin:0;
  padding:0;
  columns:2;
  column-gap:36px;
}
.checklist li{
  break-inside:avoid;
  padding-left:20px;
  margin-bottom:14px;
  position:relative;
}
.checklist li::before{
  content:"";
  position:absolute;
  left:0;top:.7em;
  width:9px;height:1px;
  background:var(--acc);
}

ul.plain{padding-left:20px;margin:0 0 18px}
ul.plain li{margin-bottom:10px}
ul.plain li::marker{color:var(--acc)}

ol.steps{padding-left:22px;margin:0 0 18px}
ol.steps li{margin-bottom:12px;padding-left:4px}
ol.steps li::marker{font-family:var(--mono);font-size:13px;color:var(--acc-2)}

/* ---------- dark detail block ---------- */

.detail-fig{grid-column:2 / 6;margin:0}
.detail-fig img{width:100%;height:auto}
.detail-fig figcaption{margin-top:12px}
.detail-txt{grid-column:7 / 13}

/* ---------- data rows ---------- */

.rows{grid-column:3 / 12;border-top:1px solid var(--line);margin:26px 0 0}
.sec.dark .rows{border-top-color:#3d434c}
.rows div{
  display:grid;
  grid-template-columns:minmax(140px,3fr) 7fr;
  gap:6px 24px;
  padding:14px 0;
  border-bottom:1px solid var(--line);
}
.sec.dark .rows div{border-bottom-color:#3d434c}
.rows dt{font-family:var(--mono);font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-2);margin:0;padding-top:3px}
.sec.dark .rows dt{color:#9aa1ad}
.rows dd{margin:0}

/* ---------- accent rule between paragraphs ---------- */

.stroke{
  width:44px;height:2px;
  background:var(--acc-2);
  margin:26px 0;
  border:0;
}

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

.site-footer{background:var(--bg-alt);border-top:1px solid var(--line);padding:34px 0 28px}
.patchbay{
  grid-column:1 / 13;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:18px 32px;
  flex-wrap:wrap;
}
.patchbay .f-name{font-family:var(--mono);font-size:14px;letter-spacing:.26em;text-transform:uppercase;font-weight:700}
.patchbay nav{display:flex;flex-wrap:wrap;gap:6px 24px;justify-content:center}
.patchbay nav a{font-family:var(--mono);font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-2);text-decoration:none}
.patchbay nav a:hover{color:var(--acc);text-decoration:underline}
.patchbay .f-mail{font-family:var(--mono);font-size:12.5px;letter-spacing:.06em}
.foot-rule{grid-column:1 / 13;height:1px;background:var(--line);margin:22px 0 12px}
.foot-note{grid-column:1 / 13;font-size:13px;line-height:1.6;color:var(--ink-2);margin:0}

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

@media (max-width:960px){
  .rail{grid-column:1 / 13;margin-bottom:14px}
  .rail-scale{display:none}
  .rail-mark{padding-top:0}
  .rail-mark b{display:inline;margin-right:12px}
  h1,.hero-sub,.body-col,.wide-col,.checklist,.rows{grid-column:1 / 13}
  .fig-main{grid-column:1 / 13}
  .fig-side{grid-column:1 / 13;margin-top:12px;align-self:auto}
  .detail-fig{grid-column:1 / 8}
  .detail-txt{grid-column:1 / 13;margin-top:28px}
  .brand{grid-column:1 / 13}
  .site-nav{grid-column:1 / 13;justify-content:flex-start;margin-top:10px}
}

@media (max-width:640px){
  :root{--step:48px}
  body{font-size:16px}
  .grid{padding:0 18px;column-gap:16px}
  .checklist{columns:1}
  .detail-fig{grid-column:1 / 13}
  .rows div{grid-template-columns:1fr}
  .patchbay{flex-direction:column;align-items:flex-start}
  .patchbay nav{justify-content:flex-start}
  .ticks{margin-bottom:28px}
  .lead{font-size:17px}
}