:root {
  --green: #00694E;          /* Cutler Green */
  --green-dark: #024230;     /* Under the Elms */
  --sycamore: #f1f5e6;       /* paler than #E7ECC3 for backgrounds */
  --sycamore-strong: #E7ECC3;
  --hairline: #c0c5cc;
  --putnam: #54595e;         /* close to #756E65 */
  --ink: #1c1c1c;
  --code-bg: #f0f2f5;
  --warn-bg: #fff7d6;
  --link: #00694E;
  --marigold: #AA8A00;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, "Segoe UI", system-ui, Arial, sans-serif;
  color: var(--ink);
  line-height: 1.55;
  margin: 0;
  background: #fafbfc;
}

.page-header,
.doc-body,
.toc,
.page-footer,
.index-grid,
.index-intro {
  max-width: 880px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 28px;
  padding-right: 28px;
}
.page-header {
  padding-top: 28px;
  padding-bottom: 14px;
  border-bottom: 3px solid var(--green);
  background: linear-gradient(to bottom, #fff, var(--sycamore));
}
.page-header h1 {
  margin: 6px 0 4px;
  font-size: 26px;
  color: var(--green-dark);
}
.page-header .subtitle {
  margin: 0;
  color: var(--putnam);
  font-size: 14px;
}
.back-link {
  display: inline-block;
  font-size: 13px;
  color: var(--green-dark);
  text-decoration: none;
  margin-bottom: 4px;
}
.back-link:hover { text-decoration: underline; }

.toc {
  margin-top: 18px;
  font-size: 14px;
}
.toc details {
  background: white;
  border: 1px solid var(--hairline);
  border-radius: 6px;
  padding: 8px 14px;
}
.toc summary {
  cursor: pointer;
  font-weight: bold;
  color: var(--green-dark);
  outline: none;
}
.toc ul {
  list-style: none;
  padding-left: 0;
  margin: 8px 0 4px;
  columns: 2;
  column-gap: 28px;
}
.toc li { margin: 2px 0; break-inside: avoid; }
.toc li.toc-sub { padding-left: 16px; }
.toc a {
  color: var(--link);
  text-decoration: none;
}
.toc a:hover { text-decoration: underline; }

.doc-body { padding-top: 22px; padding-bottom: 60px; }
.doc-body h2 {
  margin-top: 36px;
  margin-bottom: 10px;
  padding: 6px 12px;
  font-size: 18px;
  color: var(--green-dark);
  background: var(--sycamore);
  border-left: 4px solid var(--green);
  border-radius: 3px;
  scroll-margin-top: 12px;
}
.doc-body h3 {
  margin-top: 24px;
  margin-bottom: 8px;
  font-size: 15px;
  color: var(--green-dark);
  scroll-margin-top: 12px;
}
.doc-body p { margin: 10px 0; }
.doc-body strong { color: var(--green-dark); }
.doc-body em { color: #2a4d3e; }
.doc-body a { color: var(--link); }
.doc-body a:hover { text-decoration-thickness: 2px; }

.doc-body ul,
.doc-body ol {
  padding-left: 24px;
  margin: 10px 0;
}
.doc-body li { margin: 4px 0; }
.doc-body li > p { margin: 4px 0; }

.doc-body code {
  font-family: "SF Mono", Consolas, "Cascadia Mono", monospace;
  font-size: 13px;
  background: var(--code-bg);
  padding: 1px 5px;
  border-radius: 3px;
  color: #1d4030;
}
.doc-body pre {
  background: #fdfdf6;
  border: 1px solid var(--hairline);
  border-left: 3px solid var(--green);
  border-radius: 4px;
  padding: 10px 14px;
  overflow-x: auto;
  font-size: 13px;
  line-height: 1.45;
}
.doc-body pre code {
  background: transparent;
  padding: 0;
  color: inherit;
}
.doc-body blockquote {
  margin: 12px 0;
  padding: 8px 14px;
  background: var(--warn-bg);
  border-left: 4px solid var(--marigold);
  border-radius: 3px;
  color: #4a3d12;
}
.doc-body blockquote p { margin: 4px 0; }
.doc-body table {
  border-collapse: collapse;
  margin: 12px 0;
  font-size: 13px;
  width: 100%;
}
.doc-body th, .doc-body td {
  border: 1px solid var(--hairline);
  padding: 6px 10px;
  text-align: left;
  vertical-align: top;
}
.doc-body th { background: var(--sycamore); }
.doc-body hr {
  border: none;
  border-top: 1px solid var(--hairline);
  margin: 24px 0;
}
.doc-body hr.doc-section-break {
  border-top: 3px double var(--green);
  margin: 48px 0 8px;
}
.doc-body h2.doc-section-title {
  background: var(--green-dark);
  color: white;
  border-left: none;
  font-size: 20px;
  padding: 10px 14px;
  margin-top: 8px;
}
.doc-body p.doc-section-lede {
  font-size: 14px;
  color: var(--putnam);
  margin: 0 0 24px;
  font-style: italic;
}
.toc li.toc-divider {
  margin-top: 8px;
  padding-top: 6px;
  border-top: 1px solid var(--hairline);
  font-weight: bold;
}
.toc li.toc-divider a { color: var(--green-dark); }

.page-footer {
  margin-top: 30px;
  padding-top: 16px;
  padding-bottom: 30px;
  border-top: 1px solid var(--hairline);
  font-size: 13px;
  color: var(--putnam);
}
.page-footer a { color: var(--link); }

.index-intro {
  padding-top: 8px;
  padding-bottom: 20px;
}
.index-intro p {
  margin: 8px 0;
  color: var(--ink);
}
.index-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
  padding-top: 12px;
  padding-bottom: 40px;
}
.tile {
  display: block;
  background: white;
  border: 2px solid var(--green);
  border-radius: 8px;
  padding: 18px 20px;
  text-decoration: none;
  color: var(--ink);
  transition: transform 120ms, box-shadow 120ms, background 120ms;
}
.tile:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(2, 66, 48, 0.15);
  background: var(--sycamore);
}
.tile h2 {
  margin: 0 0 6px;
  font-size: 18px;
  color: var(--green-dark);
}
.tile p {
  margin: 0;
  font-size: 14px;
  color: var(--putnam);
  line-height: 1.45;
}
.tile.tile-secondary { border-color: var(--hairline); }
.tile.tile-secondary h2 { color: var(--putnam); }

.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 10px 0;
}
.badge-row .b {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 10px;
  font-size: 12px;
  font-weight: bold;
  color: white;
  background: var(--putnam);
}
.b.diff   { background: #475569; }
.b.fam    { background: #1e6091; }
.b.hhm    { background: #0d9488; }
.b.hhmh   { background: #4338ca; }
.b.fw     { background: #ea580c; }
.b.cs     { background: #7c3aed; }
.b.gold   { background: var(--marigold); }

@media (max-width: 600px) {
  .toc ul { columns: 1; }
  .page-header,
  .doc-body,
  .toc,
  .page-footer,
  .index-grid,
  .index-intro {
    padding-left: 16px;
    padding-right: 16px;
  }
  .page-header h1 { font-size: 22px; }
}