:root {
  color-scheme: light dark;
  --bg: #f7f8fa;
  --surface: #ffffff;
  --surface-soft: #eef3f1;
  --text: #17201d;
  --muted: #5e6b66;
  --line: #cfd8d4;
  --accent: #087c5b;
  --accent-strong: #075e48;
  --code: #edf1f0;
  --warn: #8a5a00;
  --warn-bg: #fff7df;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.75 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.topbar,
body > nav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  gap: 16px;
  align-items: center;
  min-height: 48px;
  padding: 9px max(18px, calc((100vw - 980px) / 2));
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--surface) 94%, transparent);
  backdrop-filter: blur(10px);
}

.topbar a,
body > nav a {
  color: var(--accent);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
}

.topbar nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
}

main,
body > article,
body > header:not(.topbar):not(.papers-globalbar),
body > section,
body > h1,
body > h2,
body > h3,
body > p,
body > pre,
body > table,
body > ul,
body > ol,
body > footer {
  max-width: 980px;
  margin-right: auto;
  margin-left: auto;
}

main,
body > article {
  padding: 38px 28px 80px;
}

header.hero,
main > header {
  margin-bottom: 32px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line);
}

h1 {
  margin: 0 0 12px;
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.2;
  letter-spacing: 0;
  overflow-wrap: break-word;
  text-wrap: balance;
}

h2 {
  margin: 44px 0 14px;
  padding-top: 10px;
  border-top: 1px solid var(--line);
  font-size: 25px;
  line-height: 1.3;
  letter-spacing: 0;
}

h3 {
  margin: 28px 0 10px;
  font-size: 19px;
  line-height: 1.4;
  letter-spacing: 0;
}

p { margin: 10px 0; }

a { color: var(--accent); }

.meta,
.kicker,
.subtitle,
.venue,
footer {
  color: var(--muted);
  font-size: 14px;
}

.lead {
  max-width: 820px;
  font-size: 18px;
  line-height: 1.7;
}

.summary,
.callout,
.takeaway,
blockquote {
  margin: 18px 0;
  padding: 14px 17px;
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent);
  background: var(--surface-soft);
}

.warning,
.evidence-limit {
  border-left-color: var(--warn);
  background: var(--warn-bg);
  color: var(--text);
}

code,
pre {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

code {
  padding: 1px 5px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--code);
  font-size: .9em;
  overflow-wrap: anywhere;
}

pre {
  max-width: 100%;
  margin: 16px 0;
  padding: 15px 17px;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--code);
  font-size: 14px;
  line-height: 1.55;
  white-space: pre;
}

pre code {
  padding: 0;
  border: 0;
  background: transparent;
}

table {
  width: 100%;
  margin: 18px 0 26px;
  border-collapse: collapse;
  background: var(--surface);
}

th,
td {
  padding: 10px 12px;
  border: 1px solid var(--line);
  line-height: 1.55;
  text-align: left;
  vertical-align: top;
}

th { background: var(--surface-soft); }

ul,
ol { padding-left: 24px; }

li { margin: 6px 0; }

.toc {
  margin: 24px 0 32px;
  padding: 14px 18px;
  border: 1px solid var(--line);
  background: var(--surface);
}

.toc a { text-decoration: none; }

.flow {
  margin: 18px 0;
  padding: 16px;
  overflow-x: auto;
  border: 1px solid var(--line);
  background: var(--surface);
  font-family: "SFMono-Regular", Consolas, monospace;
  white-space: pre;
}

figure { margin: 24px 0; }

img {
  display: block;
  max-width: 100%;
  height: auto;
}

figcaption {
  margin-top: 8px;
  color: var(--muted);
  font-size: 13px;
}

footer {
  margin-top: 48px;
  padding: 18px 0 0;
  border-top: 1px solid var(--line);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111614;
    --surface: #18201d;
    --surface-soft: #202b27;
    --text: #ecf3f0;
    --muted: #a8b6b0;
    --line: #3b4944;
    --accent: #62d6b1;
    --accent-strong: #8ce5c8;
    --code: #1c2622;
    --warn: #f0c36a;
    --warn-bg: #302816;
  }
}

@media (max-width: 700px) {
  .topbar,
  body > nav {
    position: static;
    flex-wrap: wrap;
    gap: 8px 14px;
    padding: 10px 16px;
  }

  main,
  body > article { padding: 26px 16px 56px; }

  h1 { font-size: 28px; }
  h2 { font-size: 22px; }

  table {
    display: block;
    max-width: 100%;
    overflow-x: auto;
  }
}

@media print {
  :root { color-scheme: light; }
  .topbar,
  body > nav { position: static; }
  body { background: #fff; color: #000; }
}