:root{
  --max: 920px;
  --gutter: clamp(18px, 3vw, 30px);
  --radius: 18px;
  --radius-sm: 12px;

  --sans: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  --serif: ui-serif, Georgia, "Times New Roman", serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  --base: 16px;
  --lh: 1.78;

  --bg: #ffffff;
  --paper: #fbfbf8;
  --text: #101113;
  --muted: rgba(16,17,19,0.74);
  --faint: rgba(16,17,19,0.58);
  --line: rgba(16,17,19,0.10);

  --accent: #1b3fff;
  --focus: rgba(27,63,255,0.78);

  --shadow: 0 26px 96px rgba(0,0,0,0.34);
  --paper-rim: rgba(255,255,255,0.55);
  --measure: 72ch;

  --ease: cubic-bezier(.2,.8,.2,1);
}

*{ box-sizing:border-box; }
html,body{ height:100%; }

body{
  margin:0;
  font-family: var(--sans);
  font-size: var(--base);
  line-height: var(--lh);
  letter-spacing: 0.10px;
  color: var(--text);
  background: var(--bg);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  font-kerning: normal;
}

html[data-theme="dark"]{
  color-scheme: dark;
}

html[data-theme="dark"] body{
  background:
    radial-gradient(1400px 800px at 50% -200px,
      rgba(255,210,150,0.10),
      rgba(255,210,150,0.00) 60%
    ),
    radial-gradient(1200px 900px at 50% 120%,
      rgba(0,0,0,0.55),
      rgba(0,0,0,0.00) 60%
    ),
    linear-gradient(180deg,
      #0c0908 0%,
      #0e0a09 40%,
      #0a0b0e 100%
    );
}

img,svg,video{ max-width:100%; height:auto; }

::selection{ background: rgba(27,63,255,0.18); }

a{
  color: inherit;
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
  text-decoration-color: color-mix(in srgb, var(--text) 28%, transparent);
}
a:hover{
  text-decoration-color: color-mix(in srgb, var(--text) 60%, transparent);
}

:focus-visible{
  outline: 2px solid var(--focus);
  outline-offset: 3px;
  border-radius: 10px;
}

@media (prefers-reduced-motion: reduce){
  *{ transition:none !important; scroll-behavior:auto !important; }
}

.wrap{
  min-height:100%;
  display:flex;
  justify-content:center;
  padding: clamp(28px, 3.8vw, 64px) var(--gutter);
}

.container{
  width:100%;
  max-width: var(--max);
}

.paper{
  max-width: 840px;
  width: 100%;
  background: var(--paper);
  border: 1px solid rgba(16,17,19,0.12);
  border-radius: 16px;
  box-shadow:
    0 48px 140px rgba(0,0,0,0.55),
    0 18px 48px rgba(0,0,0,0.35),
    0 1px 0 var(--paper-rim) inset;

  padding: clamp(36px, 4.4vw, 66px);
  color-scheme: light;
}

:where(.stack) > * + * { margin-top: 22px; }
:where(.stack-sm) > * + * { margin-top: 14px; }

.rule{
  height:1px;
  background: rgba(16,17,19,0.10);
  margin: 20px 0 22px;
}

h1,h2,h3{
  margin:0;
  color: var(--text);
}

h1{
  font-family: var(--serif);
  font-weight: 620;
  font-size: clamp(30px, 3.0vw, 42px);
  line-height: 1.08;
  letter-spacing: 0;
}

h2{
  font-weight: 780;
  font-size: 15px;
  letter-spacing: 0.01em;
  margin-top: 64px;
  margin-bottom: 12px;
}

p + h2, ul + h2, blockquote + h2, .callout + h2{
  margin-top: 72px;
}

p{
  margin: 0 0 20px;
  color: var(--muted);
  max-width: var(--measure);
}

ul,ol{
  margin: 12px 0 20px 20px;
  padding: 0;
  color: var(--muted);
  max-width: var(--measure);
}
li{ margin: 10px 0; }

.small{ font-size: 13px; color: var(--faint); }

.kicker{
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(16,17,19,0.60);
}

.subhead{
  margin: 0;
  color: rgba(16,17,19,0.72);
  font-size: 15px;
  max-width: var(--measure);
}

strong{ color: var(--text); }
em{ color: color-mix(in srgb, var(--text) 86%, transparent); }

code, pre, .mono{ font-family: var(--mono); }
code{
  font-size: 0.95em;
  padding: 0.12em 0.35em;
  border: 1px solid rgba(16,17,19,0.12);
  border-radius: 10px;
  background: rgba(16,17,19,0.025);
}
pre{
  padding: 14px 16px;
  border: 1px solid rgba(16,17,19,0.12);
  border-radius: var(--radius-sm);
  background: rgba(16,17,19,0.025);
  overflow:auto;
}

.doc-head{
  padding-bottom: 10px;
}

.doc-top{
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap: 14px;
}

.doc-right{
  display:flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items:center;
  justify-content:flex-end;
  color: rgba(16,17,19,0.52);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.doc-byline{
  margin-top: 10px;
  font-size: 13px;
  color: rgba(16,17,19,0.62);
  display:flex;
  gap: 10px;
  align-items:center;
}

.dot{ opacity: 0.55; }

.callout{
  border: 1px solid rgba(16,17,19,0.10);
  border-radius: 12px;
  padding: 18px 18px;
  background: rgba(16,17,19,0.02);
  margin: 22px 0 26px;
  color: var(--text);
}
.callout p{ margin:0; color: var(--text); }

.cta{
  border: 1px solid rgba(16,17,19,0.10);
  border-radius: 14px;
  padding: 18px 18px;
  background: rgba(16,17,19,0.015);
}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap: 10px;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid rgba(16,17,19,0.14);
  background: rgba(16,17,19,0.02);
  color: var(--text);
  text-decoration:none;
  width: fit-content;
  transition: transform 90ms var(--ease), background 140ms var(--ease), border-color 140ms var(--ease);
}
.btn:hover{
  transform: translateY(-1px);
  border-color: rgba(16,17,19,0.22);
  background: rgba(16,17,19,0.04);
}
.btn--solid{
  background: var(--text);
  color: var(--paper);
  border-color: transparent;
}
.btn--solid:hover{
  background: color-mix(in srgb, var(--text) 92%, #000);
}

.footer{
  margin-top: 44px;
  padding-top: 18px;
  border-top: 1px solid rgba(16,17,19,0.08);
  color: var(--faint);
  font-size: 12px;
  display:flex;
  flex-direction:column;
  gap: 12px;
}

.center{ text-align:center; }

@media (max-width: 520px){
  :root{ --base: 15px; }
  .paper{ padding: 24px; }
  h1{ font-size: 30px; }
  h2{ margin-top: 54px; }
}

@media print{
  body{ background:#fff !important; }
  .wrap{ padding:0 !important; }
  .paper{
    max-width:none !important;
    border:none !important;
    box-shadow:none !important;
    background:#fff !important;
    padding:0 !important;
  }
  @page{
    size:A4;
    margin:18mm;
  }
  a{ text-decoration:none; }
  .btn,.cta{
    border:1px solid #000 !important;
    background:transparent !important;
    color:#000 !important;
  }
  h2,h3{ break-after: avoid-page; break-inside: avoid; }
  p,ul,ol,.callout{ break-inside: avoid; }
}