/* Load IBM Plex for pages that don't inject a <link> (e.g., generated index) */
@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@300;400;600&family=IBM+Plex+Serif:wght@400;600&family=IBM+Plex+Mono:wght@400;600&display=swap');

/* =========================================================
   Carbon-ish typography: IBM Plex + expressive type scale
   ========================================================= */
:root {
  --cds-font-sans: 'IBM Plex Sans','Helvetica Neue',Arial,sans-serif;
  --cds-font-serif:'IBM Plex Serif',Georgia,'Times New Roman',serif;
  --cds-font-mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

  /* Body (expressive base 16px) */
  --cds-body-long-02-size: 1rem;      /* 16px */
  --cds-body-long-02-line: 1.5;       /* 24px */
  --cds-body-long-01-size: .875rem;   /* 14px */
  --cds-body-long-01-line: 1.25;      /* 20px */

  /* Headings (expressive) */
  --cds-heading-05-size: 2.625rem;    /* 42px */
  --cds-heading-05-line: 1.2;
  --cds-heading-05-weight: 300;

  --cds-heading-04-size: 1.75rem;     /* 28px */
  --cds-heading-04-line: 1.285;       /* 36px */
  --cds-heading-04-weight: 400;

  --cds-heading-03-size: 1.25rem;     /* 20px */
  --cds-heading-03-line: 1.4;         /* 28px */
  --cds-heading-03-weight: 400;

  --cds-heading-02-size: 1rem;        /* 16px */
  --cds-heading-02-line: 1.5;         /* 24px */
  --cds-heading-02-weight: 600;

  --cds-heading-01-size: .875rem;     /* 14px */
  --cds-heading-01-line: 1.25;        /* 20px */
  --cds-heading-01-weight: 600;
  --cds-heading-01-letter: .16px;

  /* Quotation */
  --cds-quotation-01-size: 1.5rem;    /* 24px */
  --cds-quotation-01-line: 1.25;      /* 30px */

  /* Dark theme (Carbon G90) */
  --cds-text-100: #ffffff;   /* White text */
  --cds-text-70:  #c6c6c6;   /* Gray 30 for secondary text */
  --cds-border:   #525252;   /* Gray 70 */
  --cds-bg-subtle:#393939;   /* Gray 80 for blocks/code */
  --cds-link:     #78a9ff;   /* Blue 40 (accessible on dark) */
}

/* Scope Carbon type to document content */
.cds-prose, .cds-prose :where(*) { box-sizing: border-box; }
.cds-prose {
  font-family: var(--cds-font-sans);
  font-size: var(--cds-body-long-02-size);
  line-height: var(--cds-body-long-02-line);
  color: var(--cds-text-100);
  letter-spacing: 0;
}

/* Headings mapping (expressive) */
.cds-prose h1 {
  font: var(--cds-heading-05-weight) var(--cds-heading-05-size)/var(--cds-heading-05-line) var(--cds-font-sans);
  margin: 0 0 .75rem;
}
.cds-prose h2 {
  font: var(--cds-heading-04-weight) var(--cds-heading-04-size)/var(--cds-heading-04-line) var(--cds-font-sans);
  margin: 2rem 0 .5rem;
}
.cds-prose h3 {
  font: var(--cds-heading-03-weight) var(--cds-heading-03-size)/var(--cds-heading-03-line) var(--cds-font-sans);
  margin: 1.5rem 0 .25rem;
}
.cds-prose h4 {
  font: var(--cds-heading-02-weight) var(--cds-heading-02-size)/var(--cds-heading-02-line) var(--cds-font-sans);
  margin: 1rem 0 .25rem;
}
.cds-prose h5 {
  font: var(--cds-heading-01-weight) var(--cds-heading-01-size)/var(--cds-heading-01-line) var(--cds-font-sans);
  letter-spacing: var(--cds-heading-01-letter);
  margin: .75rem 0 .25rem;
}
.cds-prose h6 {
  font: 600 .75rem/1.125rem var(--cds-font-sans);
  letter-spacing: .16px;
  margin: .5rem 0 .25rem;
}

/* Paragraphs, captions */
.cds-prose p { margin: 0 0 1rem; }
.cds-prose small,
.cds-prose .caption { 
  font: 400 var(--cds-body-long-01-size)/var(--cds-body-long-01-line) var(--cds-font-sans); 
  letter-spacing: .16px; 
  color: var(--cds-text-70); 
}

/* Links */
.cds-prose a { color: var(--cds-link); text-decoration: none; }
.cds-prose a:hover { text-decoration: underline; }

/* Quotes use Plex Serif */
.cds-prose blockquote {
  font: 400 var(--cds-quotation-01-size)/var(--cds-quotation-01-line) var(--cds-font-serif);
  margin: 1rem 0; 
  padding: .25rem 1rem; 
  border-left: 4px solid var(--cds-border); 
  color: var(--cds-text-100); 
  background: var(--cds-bg-subtle);
}

/* Code uses Plex Mono */
.cds-prose code, .cds-prose pre, .cds-prose kbd { font-family: var(--cds-font-mono); }
.cds-prose pre { background: var(--cds-bg-subtle); padding: .75rem; overflow:auto; border-radius: 6px; }
.cds-prose code { background: var(--cds-bg-subtle); padding: .1rem .25rem; border-radius: 4px; }

/* Lists, tables */
.cds-prose ul, .cds-prose ol { margin: 0 0 1rem 1.25rem; }
.cds-prose li { margin: .25rem 0; }
.cds-prose table { border-collapse: collapse; margin: 1rem 0; width: 100%; }
.cds-prose th, .cds-prose td { border: 1px solid var(--cds-border); padding: .5rem; text-align: left; color: var(--cds-text-100); }
.cds-prose thead th { background: #393939; }

/* Carbon-style dash bullets */
.cds-prose ul,
ul {
  list-style: none;
  margin-left: 1.25rem;
  padding-left: 0;
}
.cds-prose ul li,
ul li {
  position: relative;
  padding-left: 1rem;
}
.cds-prose ul li::before,
ul li::before {
  content: "–"; /* en-dash */
  position: absolute;
  left: 0;
  color: var(--cds-text-100);
}

/* Citations & references */
.cds-prose .citation a { text-decoration: none; color: inherit; border-bottom: 0; }
.cds-prose .citation a:hover { text-decoration: underline; }
.cds-prose .references {
  margin-top: 2.5rem; padding-top: 1rem; border-top: 1px solid var(--cds-border);
  font: 400 var(--cds-body-long-01-size)/var(--cds-body-long-01-line) var(--cds-font-sans);
}
.cds-prose .references .csl-entry { margin: 0 0 .75rem 0; }
.cds-prose .hanging-indent .csl-entry { margin-left: 2em; text-indent: -2em; }
.cds-prose .csl-left-margin { min-width: 2em; float: left; }
.cds-prose .csl-right-inline { margin-left: 2em; }
.cds-prose .references::after { content: ""; display: table; clear: both; }

/* TOC */
.cds-prose #TOC { margin: 1rem 0 2rem; }
.cds-prose #TOC a { text-decoration: none; color: inherit; }
.cds-prose #TOC a:hover { text-decoration: underline; }

/* =========================================================
   Base layout
   ========================================================= */
html { box-sizing: border-box; }
*, *::before, *::after { box-sizing: inherit; }

body {
  background: #262626; /* Carbon G90 */
  color: var(--cds-text-100);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  margin: 0 auto;
  padding: 0 1rem 3rem;
  max-width: 70ch;
}

/* Header (timestamp, title, authors) */
.page-header {
  margin: 1.5rem 0 1rem;
  text-align: center;
}
.last-updated { margin: 0 0 1rem; font-size: 0.95rem; opacity: 0.8; }
.title { margin: 0.25rem 0; text-transform: none !important; }
.authors { margin: 0.5rem 0 1rem; font-weight: 400; font-style: italic; }

/* Top nav */
.top-nav { margin: .75rem 0 1rem; font-size: .95rem; text-align: left; }
.top-nav a { text-decoration: none; color: inherit; }
.top-nav a:hover { text-decoration: underline; }

/* Headings spacing extras */
h1, h2, h3, h4 { line-height: 1.25; }
h2 { margin-top: 2rem; }
h3 { margin-top: 1.5rem; }

/* General content spacing */
p { margin: 0 0 1rem; }
ul, ol { margin: 0 0 1rem 1.25rem; }
li { margin: 0.25rem 0; }

blockquote {
  margin: 1rem 0;
  padding: 0.5rem 1rem;
  border-left: 3px solid var(--cds-border);
  background: var(--cds-bg-subtle);
  color: var(--cds-text-100);
}

/* Tables (base) */
table { border-collapse: collapse; margin: 1rem 0; width: 100%; }
th, td { border: 1px solid var(--cds-border); padding: 0.5rem; text-align: left; color: var(--cds-text-100); }
thead th { background: #393939; }

/* Utilities */
img { max-width: 100%; height: auto; }
hr { border: 0; border-top: 1px solid var(--cds-border); margin: 2rem 0; }

/* Slightly wider layout on large screens */
@media (min-width: 900px) {
  body { max-width: 80ch; }

 /* Carbon-style breadcrumb (G90) */
/* Carbon-style breadcrumb (G90) */
.cds-breadcrumb {
  margin: .75rem 0 1rem;
  font: 400 var(--cds-body-long-01-size)/var(--cds-body-long-01-line) var(--cds-font-sans);
  color: var(--cds-text-70);
}
.cds-breadcrumb ol { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: .25rem; }
.cds-breadcrumb li { display: flex; align-items: center; }
.cds-breadcrumb li + li::before { content: "›"; opacity: .8; margin: 0 .5rem; }
.cds-breadcrumb a { color: var(--cds-link); text-decoration: none; }
.cds-breadcrumb a:hover { text-decoration: underline; }
.cds-breadcrumb [aria-current="page"] { color: var(--cds-text-100); font-weight: 600; }

}