:root {
  color-scheme: light dark;
  --answer-page-max: 1120px;
  --answer-reading-max: 760px;
  --answer-gutter: clamp(20px, 4vw, 56px);
  --answer-section-gap: clamp(28px, 4vw, 56px);
  --answer-panel-pad: clamp(18px, 2.5vw, 30px);
  --answer-radius: 8px;
  --answer-bg: #fbfaf7;
  --answer-surface: #ffffff;
  --answer-surface-muted: #f5f2ec;
  --answer-lead-bg: #fbfaf6;
  --answer-text: #171513;
  --answer-muted: #66605a;
  --answer-faint: #8a837a;
  --answer-border: rgba(28, 25, 23, 0.14);
  --answer-border-strong: rgba(28, 25, 23, 0.28);
  --answer-accent: #1f3a34;
  --answer-link: #171513;
  --answer-focus: rgba(31, 58, 52, 0.32);
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background:
    linear-gradient(180deg, rgba(23, 21, 19, 0.035), transparent 280px),
    var(--answer-bg);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body {
  width: min(100% - (var(--answer-gutter) * 2), var(--answer-page-max));
  min-height: 100%;
  margin: 0 auto;
  padding: clamp(28px, 5vw, 72px) 0 clamp(56px, 7vw, 104px);
  color: var(--answer-text);
  background: transparent;
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: clamp(16px, 1vw, 18px);
  line-height: 1.72;
}

body::before {
  display: block;
  width: 72px;
  height: 10px;
  margin: 0 0 clamp(30px, 5vw, 66px);
  content: "";
  border-top: 2px solid var(--answer-text);
  border-bottom: 2px solid var(--answer-text);
  opacity: 0.92;
}

nav,
main,
.footer {
  display: grid;
  grid-template-columns: minmax(0, var(--answer-reading-max));
  justify-content: center;
}

nav {
  gap: 8px;
  margin: 0 0 clamp(30px, 5vw, 58px);
  color: var(--answer-muted);
  font-size: clamp(12px, 0.78vw, 13px);
  line-height: 1.8;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

nav a {
  display: inline-block;
  margin: 0 5px 8px 0;
  padding: 5px 8px;
  border: 1px solid var(--answer-border);
  border-radius: 999px;
  color: var(--answer-muted);
  text-decoration: none;
  transition: color 160ms ease, border-color 160ms ease, background-color 160ms ease;
}

a {
  color: var(--answer-link);
  text-decoration-color: currentColor;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  overflow-wrap: anywhere;
}

a:hover,
nav a:hover {
  color: var(--answer-text);
  border-color: var(--answer-border-strong);
  background: rgba(31, 58, 52, 0.05);
}

a:focus-visible {
  outline: 2px solid var(--answer-focus);
  outline-offset: 4px;
  border-radius: 4px;
}

main {
  row-gap: 0;
}

h1,
h2,
p,
ul {
  max-width: var(--answer-reading-max);
}

h1 {
  margin: 0 0 clamp(18px, 2.3vw, 28px);
  font-size: clamp(36px, 5.2vw, 72px);
  font-weight: 650;
  line-height: 0.98;
  letter-spacing: 0;
}

h2 {
  margin: 0 0 12px;
  font-size: clamp(19px, 1.45vw, 24px);
  font-weight: 620;
  line-height: 1.22;
  letter-spacing: 0;
}

p {
  margin: 0 0 18px;
  color: var(--answer-muted);
}

ul {
  margin: 0 0 22px;
  padding-left: 1.1em;
  color: var(--answer-muted);
}

li {
  margin: 0 0 10px;
  padding-left: 0.2em;
}

.lead {
  margin: 0 0 var(--answer-section-gap);
  padding: var(--answer-panel-pad);
  border: 1px solid var(--answer-border);
  border-left: 3px solid var(--answer-accent);
  border-radius: var(--answer-radius);
  background: var(--answer-lead-bg);
  color: var(--answer-text);
  font-size: clamp(18px, 1.45vw, 22px);
  line-height: 1.55;
  box-shadow: 0 18px 44px rgba(28, 25, 23, 0.045);
}

.qa {
  margin: 0;
  padding: clamp(22px, 3.2vw, 42px) 0;
  border-top: 1px solid var(--answer-border);
}

.qa:first-of-type {
  border-top-color: var(--answer-border-strong);
}

.qa p:last-child,
.facts p:last-child,
.footer p:last-child {
  margin-bottom: 0;
}

.facts {
  margin-top: var(--answer-section-gap);
  padding: var(--answer-panel-pad);
  border: 1px solid var(--answer-border);
  border-radius: var(--answer-radius);
  background: var(--answer-surface);
  box-shadow: 0 18px 44px rgba(28, 25, 23, 0.04);
}

.facts h2 {
  margin-bottom: 16px;
}

.footer {
  margin-top: var(--answer-section-gap);
  padding-top: clamp(22px, 3vw, 34px);
  border-top: 1px solid var(--answer-border);
  color: var(--answer-faint);
  font-size: 0.92rem;
}

.footer p {
  color: var(--answer-faint);
}

@media (min-width: 1440px) {
  :root {
    --answer-page-max: 1120px;
    --answer-reading-max: 760px;
  }

  body {
    padding-top: 84px;
  }
}

@media (max-width: 640px) {
  :root {
    --answer-gutter: 18px;
  }

  body {
    font-size: 16px;
    line-height: 1.68;
  }

  body::before {
    width: 56px;
    margin-bottom: 34px;
  }

  nav {
    display: block;
    margin-bottom: 34px;
    font-size: 11px;
    line-height: 1.7;
    text-transform: none;
    letter-spacing: 0;
  }

  nav a {
    margin-bottom: 7px;
  }

  h1 {
    font-size: clamp(34px, 11vw, 46px);
    line-height: 1.02;
  }

  .lead {
    font-size: 17px;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --answer-bg: #050606;
    --answer-surface: #0d0f0f;
    --answer-surface-muted: #121514;
    --answer-lead-bg: #0b0e0d;
    --answer-text: #f4f0e8;
    --answer-muted: rgba(244, 240, 232, 0.68);
    --answer-faint: rgba(244, 240, 232, 0.48);
    --answer-border: rgba(244, 240, 232, 0.12);
    --answer-border-strong: rgba(244, 240, 232, 0.28);
    --answer-accent: #b6d8cd;
    --answer-link: #f4f0e8;
    --answer-focus: rgba(182, 216, 205, 0.32);
  }

  html {
    background:
      radial-gradient(circle at 50% 0%, rgba(182, 216, 205, 0.08), transparent 360px),
      var(--answer-bg);
  }

  .lead,
  .facts {
    box-shadow: 0 22px 70px rgba(0, 0, 0, 0.34);
  }

  nav a:hover {
    background: rgba(244, 240, 232, 0.055);
  }
}

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