:root {
  color-scheme: dark;
  --bg: #070814;
  --surface: #0c0e22;
  --surface-2: #11142d;
  --line: rgba(129, 140, 248, 0.24);
  --line-soft: rgba(148, 163, 184, 0.16);
  --text: #f8fafc;
  --muted: #cbd5e1;
  --quiet: #94a3b8;
  --indigo: #818cf8;
  --violet: #a78bfa;
  --blue: #60a5fa;
  --green: #34d399;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background:
    radial-gradient(circle at 15% 8%, rgba(79, 70, 229, 0.2), transparent 30rem),
    radial-gradient(circle at 88% 28%, rgba(124, 58, 237, 0.12), transparent 28rem),
    var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
.shell { width: min(1160px, calc(100% - 40px)); margin-inline: auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--line-soft);
  background: rgba(7, 8, 20, 0.86);
  backdrop-filter: blur(18px);
}
.nav-shell { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; }
.brand-mark {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(129, 140, 248, 0.55);
  border-radius: 13px;
  background: linear-gradient(135deg, #4f46e5, #7c3aed);
  font-size: 12px;
  font-weight: 900;
  box-shadow: 0 12px 34px rgba(79, 70, 229, 0.3);
}
.brand strong, .brand small { display: block; }
.brand strong { font-size: 19px; letter-spacing: -0.02em; }
.brand small { margin-top: 2px; color: var(--quiet); font-size: 10px; }
.site-header nav { display: flex; align-items: center; gap: 26px; }
.site-header nav a { color: var(--muted); font-size: 14px; font-weight: 650; text-decoration: none; }
.site-header nav a:hover { color: white; }
.site-header .nav-cta, .button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 19px;
  border: 1px solid rgba(167, 139, 250, 0.46);
  border-radius: 12px;
  background: linear-gradient(135deg, #4f46e5, #7c3aed);
  color: white;
  font-weight: 750;
  text-decoration: none;
  box-shadow: 0 14px 34px rgba(79, 70, 229, 0.28);
}
.button:hover, .nav-cta:hover { transform: translateY(-1px); filter: brightness(1.08); }

.breadcrumb { padding-block: 28px 0; display: flex; gap: 9px; color: var(--quiet); font-size: 12px; overflow: hidden; }
.breadcrumb a { color: #c7d2fe; text-decoration: none; }
.breadcrumb span:last-child { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.eyebrow { color: var(--indigo); font-size: 11px; font-weight: 850; letter-spacing: 0.13em; text-transform: uppercase; }

.article-hero { padding-block: 64px 58px; display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 54px; align-items: end; }
.hero-copy h1, .hub-hero h1 {
  margin: 15px 0 22px;
  max-width: 900px;
  font-size: clamp(2.45rem, 6vw, 4.85rem);
  line-height: 1.03;
  letter-spacing: -0.05em;
  text-wrap: balance;
}
.hero-copy > p, .hub-hero p { max-width: 780px; margin: 0; color: var(--muted); font-size: clamp(1rem, 2vw, 1.22rem); line-height: 1.72; }
.article-meta { display: flex; flex-wrap: wrap; gap: 10px 22px; margin-top: 28px; color: var(--quiet); font-size: 12px; }
.article-meta span::before { content: "•"; margin-right: 8px; color: var(--indigo); }
.hero-panel {
  padding: 25px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: linear-gradient(145deg, rgba(17, 20, 45, 0.95), rgba(12, 14, 34, 0.8));
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.26);
}
.hero-panel strong { font-size: 15px; }
.hero-panel p { margin: 10px 0 0; color: var(--quiet); font-size: 13px; line-height: 1.65; }

.article-layout { display: grid; grid-template-columns: minmax(0, 1fr) 330px; gap: 64px; align-items: start; }
.article-body { min-width: 0; }
.article-section { padding: 38px 0; border-top: 1px solid var(--line-soft); }
.article-section:first-child { border-top-color: var(--line); }
.article-section h2, .faq h2, .related h2, .section-heading h2 {
  margin: 0 0 18px;
  font-size: clamp(1.55rem, 3vw, 2.15rem);
  line-height: 1.16;
  letter-spacing: -0.035em;
  text-wrap: balance;
}
.article-section p, .faq p { color: var(--muted); line-height: 1.82; font-size: 16px; }
.article-section a { color: #a5b4fc; text-decoration-thickness: 1px; text-underline-offset: 3px; }
.article-section a:hover { color: #c7d2fe; }
.article-section ul { margin: 25px 0 0; padding: 0; display: grid; gap: 12px; list-style: none; }
.article-section li, .checklist li { position: relative; padding-left: 27px; color: var(--muted); line-height: 1.55; }
.article-section li::before, .checklist li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--green);
  font-weight: 900;
}
.checklist {
  position: sticky;
  top: 105px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: rgba(12, 14, 34, 0.9);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.24);
}
.checklist h2 { margin: 11px 0 20px; font-size: 23px; }
.checklist ul { margin: 0 0 25px; padding: 0; display: grid; gap: 13px; list-style: none; }
.checklist li { font-size: 13px; }
.checklist .button { width: 100%; min-height: 50px; padding-inline: 14px; text-align: center; font-size: 13px; }

.faq, .related, .hub-guides { padding-block: 86px; }
.faq { max-width: 820px; }
.faq > h2, .related > h2 { margin-top: 11px; }
.faq details { border-top: 1px solid var(--line-soft); }
.faq details:last-child { border-bottom: 1px solid var(--line-soft); }
.faq summary { padding: 22px 34px 22px 0; cursor: pointer; font-weight: 750; }
.faq details p { margin: -7px 0 23px; font-size: 14px; }
.card-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.guide-card {
  min-height: 260px;
  padding: 28px;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--line-soft);
  border-radius: 24px;
  background: linear-gradient(150deg, rgba(17, 20, 45, 0.96), rgba(10, 12, 29, 0.86));
  text-decoration: none;
  transition: transform 180ms ease, border-color 180ms ease;
}
.guide-card:hover { transform: translateY(-3px); border-color: rgba(129, 140, 248, 0.55); }
.guide-card > span { color: var(--indigo); font-size: 10px; font-weight: 850; letter-spacing: 0.12em; text-transform: uppercase; }
.guide-card h3 { margin: 15px 0 12px; font-size: 22px; line-height: 1.2; letter-spacing: -0.025em; }
.guide-card p { margin: 0 0 24px; color: var(--quiet); font-size: 13px; line-height: 1.68; }
.guide-card strong { margin-top: auto; color: #c7d2fe; font-size: 13px; }

.closing-cta { padding-block: 34px 72px; }
.closing-cta .shell { padding: 38px; display: flex; align-items: center; justify-content: space-between; gap: 34px; border: 1px solid var(--line); border-radius: 28px; background: linear-gradient(120deg, rgba(49, 46, 129, 0.5), rgba(88, 28, 135, 0.38)); }
.closing-cta h2 { max-width: 720px; margin: 10px 0 0; font-size: clamp(1.65rem, 4vw, 2.75rem); letter-spacing: -0.04em; line-height: 1.08; }

.hub-hero { padding-block: 112px 92px; border-bottom: 1px solid var(--line-soft); }
.hub-hero h1 { max-width: 980px; }
.hub-hero p { max-width: 760px; }
.section-heading { margin-bottom: 35px; display: flex; align-items: end; justify-content: space-between; gap: 44px; }
.section-heading h2 { margin: 10px 0 0; }
.section-heading p { max-width: 510px; margin: 0; color: var(--quiet); line-height: 1.65; font-size: 14px; }
.principles { padding-bottom: 90px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.principles div { padding: 28px; border-top: 1px solid var(--line); background: rgba(12, 14, 34, 0.45); }
.principles strong { color: var(--indigo); font-size: 12px; }
.principles h2 { margin: 13px 0 9px; font-size: 21px; }
.principles p { margin: 0; color: var(--quiet); font-size: 13px; line-height: 1.62; }

.site-footer { padding-block: 48px; border-top: 1px solid var(--line-soft); background: rgba(5, 6, 14, 0.75); }
.footer-grid { display: flex; justify-content: space-between; gap: 40px; color: var(--quiet); font-size: 12px; }
.footer-grid strong { color: white; font-size: 18px; }
.footer-grid p { max-width: 520px; line-height: 1.65; }
.footer-grid > div:last-child { display: flex; flex-direction: column; align-items: end; gap: 8px; }
.footer-grid a { color: #c7d2fe; text-decoration: none; }

@media (max-width: 860px) {
  .site-header nav a:not(.nav-cta) { display: none; }
  .article-hero, .article-layout { grid-template-columns: 1fr; gap: 25px; }
  .article-hero { padding-block: 48px 35px; }
  .hero-panel { max-width: 620px; }
  .checklist { position: static; }
  .closing-cta .shell, .section-heading { align-items: flex-start; flex-direction: column; }
  .principles { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
  .shell { width: min(100% - 28px, 1160px); }
  .nav-shell { min-height: 68px; }
  .brand small { display: none; }
  .site-header .nav-cta { min-height: 40px; padding-inline: 13px; font-size: 12px; }
  .breadcrumb { padding-top: 20px; }
  .hero-copy h1, .hub-hero h1 { font-size: 2.55rem; }
  .hub-hero { padding-block: 78px 62px; }
  .article-meta { flex-direction: column; gap: 7px; }
  .card-grid { grid-template-columns: 1fr; }
  .guide-card { min-height: auto; }
  .faq, .related, .hub-guides { padding-block: 64px; }
  .closing-cta .shell { padding: 28px 22px; }
  .closing-cta .button { width: 100%; }
  .footer-grid { flex-direction: column; }
  .footer-grid > div:last-child { align-items: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.01ms !important; }
}