:root {
  --bg: #1b2531;
  --surface: #222f3d;
  --footer: #131b24;
  --text: #e8eff7;
  --muted: #89a8c6;
  --sky: #88bdf2;
  --mist: #bdddfc;
  --line: rgba(189, 221, 252, 0.18);
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Arial, sans-serif;
  color-scheme: dark;
}

* { box-sizing: border-box; border-radius: 0; }
html { background: var(--bg); scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.65 var(--font); letter-spacing: -0.01em; -webkit-font-smoothing: antialiased; }
a { color: var(--mist); text-underline-offset: 3px; }
a:hover { color: #fff; }
:focus-visible { outline: 2px solid var(--sky); outline-offset: 3px; }
h1, h2 { margin: 0; line-height: 1.1; letter-spacing: -0.025em; }
h1 { max-width: 820px; font-size: clamp(42px, 7vw, 72px); font-weight: 610; }
h2 { margin-top: 0; font-size: clamp(22px, 3vw, 30px); font-weight: 630; }
p { margin: 0; }

.public-page { min-height: 100vh; display: flex; flex-direction: column; }
.public-mast { width: min(1068px, 100%); margin: 0 auto; padding: 26px 24px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.public-brand, .footer-brand-link { display: inline-flex; align-items: center; gap: 9px; color: var(--text); font-weight: 680; text-decoration: none; }
.public-brand svg, .footer-brand-link svg { flex: none; }
.public-mast nav { display: flex; gap: 22px; }
.public-mast nav a { color: var(--muted); font-size: 14px; font-weight: 620; text-decoration: none; }
.public-main { width: min(820px, 100%); margin: 0 auto; padding: 72px 24px 110px; flex: 1; }
.article-head { margin-bottom: 42px; }
.eyebrow { margin-bottom: 12px; color: var(--sky); font-size: 12px; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; }
.page-lede { margin: -15px 0 48px; max-width: 760px; color: #c3d3e2; font-size: clamp(18px, 2.7vw, 22px); font-weight: 350; line-height: 1.55; }
article > section { margin-top: 52px; }
article section > p, article section > ul { margin-top: 16px; color: #c3d3e2; }
article ul { padding-left: 22px; }
article li + li { margin-top: 8px; }
.steps { margin: 0; padding: 0; list-style: none; counter-reset: guide; }
.steps > li { position: relative; padding: 32px 0 32px 54px; border-top: 1px solid var(--line); counter-increment: guide; }
.steps > li::before { position: absolute; top: 36px; left: 0; color: var(--sky); content: counter(guide, decimal-leading-zero); font: 700 12px/1 var(--font); letter-spacing: .08em; }
.steps p { margin-top: 12px; color: #c3d3e2; }
.callout { margin: 42px 0; padding: 20px 22px; border: 1px solid var(--line); border-left: 3px solid var(--sky); background: var(--surface); color: #cbd9e6; }
.formula-block { display: inline-block; padding: 14px 18px; border: 1px solid var(--line); background: #151f29; color: #fff !important; font: 600 17px/1.4 ui-monospace, "SF Mono", Menlo, monospace; }
.formula-inline { font-family: ui-monospace, "SF Mono", Menlo, monospace; }
.source-list { display: grid; gap: 14px; }
.next-links { margin-top: 56px; padding-top: 26px; border-top: 1px solid var(--line); display: flex; flex-wrap: wrap; gap: 12px 24px; }
.next-links a { font-weight: 620; }

.calculator-card { margin: 0; padding: 28px; border: 1px solid var(--line); background: var(--surface); }
.calculator-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.calculator-grid label { display: grid; gap: 8px; color: var(--muted); font-size: 13px; font-weight: 650; }
.calculator-grid label span { display: flex; align-items: baseline; gap: 7px; font-weight: 450; }
.calculator-grid input { min-width: 0; width: 100%; padding: 11px 12px; border: 1px solid rgba(189,221,252,.34); background: var(--bg); color: var(--text); font: 600 18px/1 var(--font); font-variant-numeric: tabular-nums; }
.calculator-result { margin-top: 28px; padding-top: 24px; border-top: 1px solid var(--line); display: flex; align-items: baseline; gap: 18px; }
.calculator-result strong { font-size: clamp(34px, 6vw, 52px); font-variant-numeric: tabular-nums; }
.calculator-result span { color: var(--muted); font-size: 18px; font-variant-numeric: tabular-nums; }
.table-wrap { margin-top: 22px; overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; }
th, td { padding: 12px 14px; border-bottom: 1px solid var(--line); text-align: left; white-space: nowrap; }
th { color: var(--muted); font-size: 12px; letter-spacing: .06em; text-transform: uppercase; }
td { color: #d6e1eb; }
.comparison { margin-top: 40px; display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.comparison section { margin: 0; padding: 24px; border: 1px solid var(--line); background: var(--surface); }
.comparison section > ul { margin-bottom: 0; }

.example-video { margin: 0 auto 44px; max-width: 420px; }
.example-video video { width: 100%; max-height: 720px; display: block; border: 1px solid var(--line); background: #000; }
.example-video figcaption { margin-top: 10px; color: var(--muted); font-size: 13px; }
.result-grid { margin: 0; display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.result-grid > div { padding: 18px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.result-grid dt { color: var(--muted); font-size: 12px; font-weight: 660; letter-spacing: .04em; text-transform: uppercase; }
.result-grid dd { margin: 7px 0 0; color: var(--text); font-weight: 650; font-variant-numeric: tabular-nums; }

.public-footer { padding: 46px 24px 50px; border-top: 1px solid var(--line); background: var(--footer); }
.public-footer-inner { width: min(820px, 100%); margin: 0 auto; display: grid; grid-template-columns: 1fr auto; gap: 22px 36px; }
.public-footer nav { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 10px 18px; }
.public-footer nav + nav { grid-column: 2; }
.public-footer nav a { color: var(--muted); font-size: 13px; text-decoration: none; }

.not-found { width: min(720px, 100%); margin: 0 auto; padding: 80px 24px; }
.not-found .eyebrow { margin-top: 100px; }
.not-found h1 { margin-bottom: 22px; }
.not-found > p:not(.eyebrow) { color: var(--muted); font-size: 18px; }
.not-found-links { margin-top: 34px; display: flex; align-items: center; flex-wrap: wrap; gap: 20px; }
.button-link { display: inline-block; padding: 11px 17px; border: 1px solid var(--sky); background: var(--sky); color: #14202b; font-weight: 700; text-decoration: none; }
.button-link:hover { color: #14202b; background: var(--mist); }

@media (max-width: 680px) {
  .public-mast { padding-inline: 16px; }
  .public-mast nav { gap: 12px; }
  .public-mast nav a:first-child { display: none; }
  .public-main { padding: 48px 18px 82px; }
  .calculator-grid, .comparison, .result-grid { grid-template-columns: 1fr; }
  .result-grid { border-left: 0; }
  .result-grid > div { border-left: 1px solid var(--line); }
  .public-footer-inner { grid-template-columns: 1fr; }
  .public-footer nav, .public-footer nav + nav { grid-column: 1; justify-content: flex-start; }
}