@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=Montserrat:wght@700;800&family=Roboto:wght@400;500;600;700&display=swap');

:root {
  color-scheme: dark;
  --onyx: #0a0b10;
  --night: #12172a;
  --snow: #f3f5f9;
  --mist: #a8b1c4;
  --hairline: rgba(154, 165, 190, 0.22);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--onyx);
  color: var(--snow);
  font: 400 16px/1.75 Inter, sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-underline-offset: 3px; }
a:focus-visible, summary:focus-visible { outline: 2px solid var(--snow); outline-offset: 4px; }
.shell { width: min(100% - 3.5rem, 1080px); margin-inline: auto; }
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  border-bottom: 1px solid var(--hairline);
  padding-block: 1.3rem;
}
.wordmark { font-family: 'Montserrat', sans-serif; font-weight: 800; font-size: 1.05rem; letter-spacing: -0.04em; text-decoration: none; white-space: nowrap; }
.site-header nav, .site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem 1.3rem;
  font: 500 .68rem/1.5 'Roboto', sans-serif;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.site-header nav a, .site-footer nav a { color: var(--mist); text-decoration: none; }
.site-header nav a:hover, .site-footer nav a:hover { color: var(--snow); }
.eyebrow, .step {
  color: var(--mist);
  font: 500 .72rem/1.5 'Roboto', sans-serif;
  letter-spacing: .17em;
  text-transform: uppercase;
}
.hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--hairline);
  background: radial-gradient(90% 120% at 85% 0%, var(--night), var(--onyx) 70%);
}
.hero .shell { position: relative; padding-block: clamp(5rem, 10vw, 9rem); }
.hero-copy { position: relative; z-index: 1; max-width: 760px; }
.hero h1, h2, h3 { line-height: 1.09; letter-spacing: -.035em; }
.hero h1 {
  max-width: 15ch;
  margin: .7rem 0 1.3rem;
  font-size: clamp(2.4rem, 5vw, 4.8rem);
  font-weight: 800;
  text-transform: uppercase;
}
.hero p:not(.eyebrow) { max-width: 61ch; color: var(--mist); font-size: 1.07rem; }
.hero img {
  position: absolute;
  right: -17%;
  bottom: -30%;
  width: min(53vw, 550px);
  opacity: .15;
  pointer-events: none;
  mask-image: linear-gradient(to left, #000 40%, transparent 100%);
}
.button {
  display: inline-flex;
  margin-top: 1.1rem;
  padding: .85rem 1.25rem;
  border: 1px solid var(--snow);
  background: var(--snow);
  color: var(--onyx);
  font: 500 .78rem/1.4 'Roboto', sans-serif;
  letter-spacing: .07em;
  text-decoration: none;
  text-transform: uppercase;
  transition: background .2s, transform .2s;
}
.button:hover { background: #dfe3ea; transform: translateY(-2px); }
.breadcrumb { display: block; margin-top: 2rem; color: var(--mist); font: .72rem 'Roboto', sans-serif; }
.breadcrumb a { color: var(--snow); }
.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 270px;
  gap: clamp(3rem, 7vw, 8rem);
  padding-block: clamp(3.5rem, 8vw, 7rem);
}
.article-content section { padding-bottom: 2rem; margin-bottom: 2.25rem; border-bottom: 1px solid var(--hairline); }
.article-content section:last-child { border-bottom: 0; }
h2 { margin: 0 0 1.2rem; font-size: clamp(1.55rem, 3vw, 2.2rem); font-weight: 800; }
h3 { margin: 1.6rem 0 .5rem; font-size: 1.1rem; font-weight: 700; }
p { margin: 0 0 1.1rem; color: var(--mist); }
strong { color: var(--snow); }
ul, ol { margin: 0 0 1.4rem; padding-left: 1.35rem; color: var(--mist); }
li { margin-bottom: .7rem; }
.side-note {
  align-self: start;
  position: sticky;
  top: 2rem;
  padding: 1.7rem;
  border: 1px solid var(--hairline);
  background: #10131f;
}
.side-note h2 { margin: .5rem 0 1rem; font-size: 1.4rem; text-transform: uppercase; }
.side-note ul { padding-left: 1.1rem; font-size: .9rem; }
.side-note p { font-size: .85rem; }
.faq details { border-top: 1px solid var(--hairline); }
.faq details:last-child { border-bottom: 1px solid var(--hairline); }
.faq summary { display: flex; justify-content: space-between; gap: 1rem; padding: 1rem 0; cursor: pointer; font-weight: 600; list-style: none; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: '+'; font-family: 'Roboto', sans-serif; }
.faq details[open] summary::after { content: '−'; }
.faq details p { padding-bottom: 1rem; }
.related { padding-block: 3.5rem 5rem; border-top: 1px solid var(--hairline); }
.related-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1px; border: 1px solid var(--hairline); background: var(--hairline); }
.related-grid a { display: block; padding: 1.3rem; background: var(--onyx); font-weight: 600; text-decoration: none; }
.related-grid a:hover { background: var(--night); }
.site-footer { display: flex; justify-content: space-between; gap: 1.5rem; padding-block: 2rem; border-top: 1px solid var(--hairline); }
.site-footer span { font-weight: 800; letter-spacing: -.04em; }
@media (max-width: 760px) {
  .site-header, .site-footer { align-items: flex-start; flex-direction: column; }
  .hero img { width: 80vw; right: -30%; bottom: -12%; opacity: .1; }
  .article-layout { grid-template-columns: 1fr; }
  .side-note { position: static; }
  .related-grid { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .button { transition: none; }
}