:root {
  --font-anthropic-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-anthropic-serif: 'Source Serif 4', Georgia, 'Times New Roman', serif;
  --font-mono: ui-monospace, 'SFMono-Regular', Menlo, Consolas, monospace;
  --color-bg: #f7f6f2;
  --color-panel: #ffffff;
  --color-fg: #1c1b19;
  --color-fg-muted: #66635c;
  --color-border-line: #e3e0d8;
  --color-bad: #c0392b;
  --color-accent: #3366cc;
  --color-accent-soft: #e8eefb;
  --cds-border: #e3e0d8;
  --cds-chart-muted: #c9c5bb;
  --cds-text-secondary: #66635c;
  --cds-surface-popover: #ffffff;
  --cds-shadow-popover: 0 6px 24px rgb(0 0 0 / 0.12);
  --cds-radius: 10px;
  --cds-gap-xs: 0.25rem;
  --cds-gap-sm: 0.5rem;
  --cds-gap-md: 1rem;
  --cds-gap-xl: 2rem;
  --cds-pad-xs: 0.25rem;
  --cds-pad-sm: 0.5rem;
  --cds-pad-md: 0.75rem;
  --cds-pad-lg: 1.25rem;
  --cds-font-size-caption: 0.8125rem;
  --cds-font-size-body: 0.9375rem;
  --cds-font-size-heading: 1.25rem;
  --cds-font-size-title: 1.875rem;
  --cds-font-weight-medium: 600;
  --cds-dur-slow: 400ms;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg: #161614;
    --color-panel: #1f1f1c;
    --color-fg: #ecebe6;
    --color-fg-muted: #a19e95;
    --color-border-line: #34332f;
    --color-bad: #f07167;
    --color-accent: #7aa2f7;
    --color-accent-soft: #1f2a44;
    --cds-border: #34332f;
    --cds-chart-muted: #4a4943;
    --cds-text-secondary: #a19e95;
    --cds-surface-popover: #2a2a26;
    --cds-shadow-popover: 0 6px 24px rgb(0 0 0 / 0.5);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --color-bg: #161614;
  --color-panel: #1f1f1c;
  --color-fg: #ecebe6;
  --color-fg-muted: #a19e95;
  --color-border-line: #34332f;
  --color-bad: #f07167;
  --color-accent: #7aa2f7;
  --color-accent-soft: #1f2a44;
  --cds-border: #34332f;
  --cds-chart-muted: #4a4943;
  --cds-text-secondary: #a19e95;
  --cds-surface-popover: #2a2a26;
  --cds-shadow-popover: 0 6px 24px rgb(0 0 0 / 0.5);
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-fg);
  font-family: var(--font-anthropic-sans);
  font-size: var(--cds-font-size-body);
  line-height: 1.5;
}
a { color: var(--color-accent); }
.site-nav {
  position: sticky; top: 0; z-index: 20;
  background: color-mix(in srgb, var(--color-bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border-line);
}
.site-nav .in { max-width: 1240px; margin: 0 auto; padding: 0.75rem 16px; display: flex; gap: 1.25rem; align-items: center; flex-wrap: wrap; }
.site-nav .brand { font-family: var(--font-anthropic-serif); font-size: 1.2rem; color: var(--color-fg); text-decoration: none; margin-right: auto; }
.site-nav .brand b { font-weight: 600; }
.site-nav a.l { color: var(--color-fg-muted); text-decoration: none; font-size: 0.9rem; }
.site-nav a.l:hover, .site-nav a.l[aria-current="page"] { color: var(--color-fg); }
.site-nav a.cta { background: var(--color-fg); color: var(--color-bg); padding: 0.35rem 0.8rem; border-radius: 999px; text-decoration: none; font-size: 0.9rem; }
main.wrap { max-width: 1240px; margin: 0 auto; padding: 1.5rem 16px 4rem; }
main.narrow { max-width: 860px; }
.site-foot { border-top: 1px solid var(--color-border-line); color: var(--color-fg-muted); font-size: var(--cds-font-size-caption); }
.site-foot .in { max-width: 1240px; margin: 0 auto; padding: 1.25rem 16px 2.5rem; display: flex; gap: 1rem; flex-wrap: wrap; justify-content: space-between; }

.dash-skeleton { position: relative; min-height: 2.5rem; }
.dash-skeleton::after {
  content: ''; position: absolute; inset: 0; border-radius: 6px;
  background: linear-gradient(90deg, transparent, color-mix(in srgb, var(--color-fg) 6%, transparent), transparent);
  background-size: 200% 100%; animation: shimmer 1.4s infinite;
}
@keyframes shimmer { from { background-position: 200% 0; } to { background-position: -200% 0; } }

h1.page { font-family: var(--font-anthropic-serif); font-weight: 400; font-size: var(--cds-font-size-title); margin: 0 0 0.25rem; }
.lede { color: var(--color-fg-muted); max-width: 70ch; margin: 0 0 1.5rem; }
.card { background: var(--color-panel); border: 1px solid var(--color-border-line); border-radius: var(--cds-radius); padding: var(--cds-pad-lg); }
.btn { font: inherit; border: 1px solid var(--color-border-line); background: var(--color-panel); color: var(--color-fg); border-radius: 8px; padding: 0.45rem 0.9rem; cursor: pointer; }
.btn.primary { background: var(--color-fg); color: var(--color-bg); border-color: var(--color-fg); }
.btn:disabled { opacity: 0.5; cursor: default; }
input.field, select.field, textarea.field {
  font: inherit; color: var(--color-fg); background: var(--color-panel);
  border: 1px solid var(--color-border-line); border-radius: 8px; padding: 0.5rem 0.7rem; min-width: 0;
}
textarea.field { resize: vertical; }
.muted { color: var(--color-fg-muted); }
.small { font-size: var(--cds-font-size-caption); }
code { font-family: var(--font-mono); font-size: 0.875em; }
pre { font-family: var(--font-mono); font-size: 0.8125rem; background: var(--color-panel); border: 1px solid var(--color-border-line); border-radius: 8px; padding: 0.75rem 1rem; overflow-x: auto; }

/* markdown answers */
.md { overflow-wrap: anywhere; }
.md > :first-child { margin-top: 0; }
.md > :last-child { margin-bottom: 0; }
.md table { border-collapse: collapse; width: 100%; font-size: 0.875rem; font-variant-numeric: tabular-nums; }
.md th, .md td { border-bottom: 1px solid var(--color-border-line); padding: 0.4rem 0.5rem; text-align: left; vertical-align: top; }
.md th { font-weight: 600; color: var(--color-fg-muted); }
.md .tbl { overflow-x: auto; margin: 0.75rem 0; }
.md h1, .md h2, .md h3 { font-family: var(--font-anthropic-serif); font-weight: 500; }
.md blockquote { margin: 0.5rem 0; padding-left: 0.9rem; border-left: 3px solid var(--color-border-line); color: var(--color-fg-muted); }