:root {
  --ink: #f4f4f2;
  --muted: #a9a9a5;
  --paper: #e9e9e5;
  --background: #111111;
  --panel: #1b1b1b;
  --line: #3b3b39;
  --accent: #d3222a;
  font-family: "Segoe UI", Arial, sans-serif;
  color: var(--ink);
  background: var(--background);
}

* { box-sizing: border-box; }

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  background:
    linear-gradient(90deg, transparent 0 16%, rgb(255 255 255 / 2%) 16% 16.12%, transparent 16.12% 83.88%, rgb(255 255 255 / 2%) 83.88% 84%, transparent 84%),
    linear-gradient(135deg, #171717 0 49.7%, #101010 49.7% 100%);
  line-height: 1.65;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.1rem max(1.25rem, calc((100vw - 1180px) / 2));
  border-bottom: 1px solid var(--line);
  background: rgb(13 13 13 / 93%);
}

.brand { color: var(--ink); font-size: .86rem; font-weight: 800; letter-spacing: .14em; text-decoration: none; text-transform: uppercase; }
.brand::before { display: inline-block; width: .52rem; height: .52rem; margin-right: .55rem; background: var(--accent); content: ""; }
.site-header span { color: var(--muted); font-size: .82rem; letter-spacing: .06em; }
.page-shell { width: min(1180px, calc(100% - 2.5rem)); margin: 0 auto; }

.breadcrumb { display: flex; flex-wrap: wrap; gap: .55rem; padding: 1.15rem 0; color: var(--muted); font-size: .85rem; }
a { color: var(--ink); text-decoration-color: var(--accent); text-decoration-thickness: 2px; text-underline-offset: .2em; }
a:hover { color: #fff; }
.breadcrumb a { color: var(--muted); }

.content-layout { display: grid; grid-template-columns: minmax(0, 1fr) 245px; gap: clamp(1.5rem, 4vw, 4.5rem); padding-bottom: 4rem; }
.article { min-width: 0; padding: clamp(1.35rem, 3vw, 3rem); border-top: 5px solid var(--accent); background: var(--paper); color: #161616; box-shadow: 0 24px 60px rgb(0 0 0 / 28%); }

h1, h2, h3 { margin: 0; font-family: Impact, Haettenschweiler, "Arial Narrow Bold", sans-serif; font-weight: 400; letter-spacing: .025em; line-height: 1; text-transform: uppercase; }
h1 { max-width: 12ch; margin-bottom: 2.8rem; font-size: clamp(2.7rem, 6vw, 5.4rem); }
h2 { margin: 3rem 0 1.4rem; padding-bottom: .65rem; border-bottom: 1px solid #bababa; font-size: clamp(1.9rem, 4vw, 3rem); }
h3 { margin: 2rem 0 .8rem; padding-left: .8rem; border-left: 4px solid var(--accent); font-family: "Segoe UI", Arial, sans-serif; font-size: 1rem; font-weight: 800; letter-spacing: .08em; }
p, li { max-width: 76ch; }
ul { padding-left: 1.25rem; }
li + li { margin-top: .35rem; }
hr { height: 1px; margin: 2rem 0; border: 0; background: #b9b9b5; }

pre { display: inline-block; min-width: 7ch; margin: 0 0 1rem; padding: .5rem .8rem; border-left: 5px solid var(--accent); background: #151515; color: #fff; font: 800 1.25rem/1.1 Consolas, "Courier New", monospace; letter-spacing: .12em; }
pre code { font: inherit; }

.section-nav { position: sticky; top: 1.25rem; padding: 1.1rem 1.2rem; border-left: 3px solid var(--accent); background: rgb(26 26 26 / 92%); }
.section-nav p { margin: 0 0 .55rem; color: #e7e7e2; font-size: .72rem; font-weight: 800; letter-spacing: .15em; text-transform: uppercase; }
.section-nav ul { margin: 0; padding: 0; list-style: none; }
.section-nav li { margin: 0; }
.section-nav a { display: block; padding: .38rem 0; color: #d7d7d3; font-size: .9rem; text-decoration: none; }
.section-nav a[aria-current="page"], .section-nav a:hover { color: #fff; }
.section-nav a[aria-current="page"] { font-weight: 800; }

@media (max-width: 760px) {
  .site-header { align-items: flex-start; flex-direction: column; gap: .15rem; }
  .page-shell { width: min(100% - 1.25rem, 1180px); }
  .content-layout { display: flex; flex-direction: column; gap: 1rem; }
  .article { padding: 1.2rem; }
  .section-nav { position: static; order: -1; }
  .section-nav ul { display: flex; flex-wrap: wrap; gap: .2rem .9rem; }
  .section-nav a { padding: .12rem 0; }
}