:root {
  --paper: #f4efe3; --paper-2: #ebe4d3; --card: #fbf8f0; --ink: #17202c; --ink-2: #4a5568; --rule: #d6ccb4;
  --accent: #1f3a5f; --accent-ink: #f4efe3; --gain: #1e7a4d; --focus: #c2410c; --code-bg: #efe9d8;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Times New Roman", serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", Menlo, Consolas, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #12161c; --paper-2: #0d1116; --card: #1a2029; --ink: #ece6d6; --ink-2: #a3acb9; --rule: #2c3644;
    --accent: #8fb4e8; --accent-ink: #0d1116; --gain: #5fd39b; --focus: #ffb27a; --code-bg: #0d1116; color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #12161c; --paper-2: #0d1116; --card: #1a2029; --ink: #ece6d6; --ink-2: #a3acb9; --rule: #2c3644;
  --accent: #8fb4e8; --accent-ink: #0d1116; --gain: #5fd39b; --focus: #ffb27a; --code-bg: #0d1116; color-scheme: dark;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; scroll-padding-top: 76px; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 16px/1.65 var(--sans); min-width: 320px; overflow-x: hidden; }
a { color: var(--accent); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; border-radius: 4px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: 12px; top: -48px; background: var(--accent); color: var(--accent-ink); padding: 8px 14px; border-radius: 6px; z-index: 50; }
.skip:focus { top: 8px; }
.disclaimer { background: var(--ink); color: var(--paper); padding: 7px 16px; font-size: 13px; text-align: center; }
.bar { position: sticky; top: 0; z-index: 30; display: flex; align-items: center; gap: 12px 18px; flex-wrap: wrap; padding: 10px 16px; background: var(--paper); border-bottom: 1px solid var(--rule); }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font: 700 19px var(--serif); }
.brand em { font-style: italic; color: var(--accent); }
.brand-mark { width: 26px; height: 26px; }
.brand-mark rect { fill: var(--accent); }
.brand-mark path { fill: none; stroke: var(--accent-ink); stroke-width: 3; stroke-linecap: round; stroke-linejoin: round; }
.brand .tag { font: 600 11px var(--mono); letter-spacing: 0.1em; text-transform: uppercase; border: 1px solid var(--rule); border-radius: 999px; padding: 4px 8px; color: var(--ink-2); }
.search { position: relative; flex: 1 1 220px; max-width: 420px; }
.search input { width: 100%; min-height: 40px; padding: 8px 12px; font: 15px var(--sans); color: var(--ink); background: var(--card); border: 1px solid var(--rule); border-radius: 8px; }
.search input:hover { border-color: var(--ink-2); }
.search input:focus-visible { outline-offset: 0; border-color: var(--focus); }
.results { position: absolute; left: 0; right: 0; top: calc(100% + 6px); margin: 0; padding: 6px; list-style: none; background: var(--card); border: 1px solid var(--rule); border-radius: 10px; box-shadow: 0 16px 40px -16px rgba(0, 0, 0, 0.5); max-height: 70vh; overflow: auto; z-index: 40; }
.results li a { display: block; padding: 9px 10px; border-radius: 6px; text-decoration: none; color: var(--ink); }
.results li a span { display: block; font-size: 13px; color: var(--ink-2); overflow-wrap: anywhere; }
.results li:hover a, .results li.on a { background: var(--paper-2); }
.results li.none { padding: 10px; color: var(--ink-2); font-size: 14px; }
.bar-links { display: flex; align-items: center; gap: 6px 16px; flex-wrap: wrap; margin-left: auto; font-size: 14px; }
.bar-links a { color: var(--ink-2); text-decoration: none; padding: 6px 2px; border-bottom: 2px solid transparent; }
.bar-links a:hover { color: var(--ink); border-bottom-color: var(--accent); }
.icon-btn { font: 600 13px var(--sans); min-height: 40px; padding: 8px 12px; border: 1px solid var(--rule); border-radius: 8px; background: var(--card); color: var(--ink); cursor: pointer; transition: background 0.15s, transform 0.08s; }
.icon-btn:hover { background: var(--paper-2); border-color: var(--ink-2); }
.icon-btn:active { transform: translateY(1px); }
.menu-btn { display: none; }
.shell { display: grid; grid-template-columns: 240px minmax(0, 1fr) 220px; gap: 32px; max-width: 1280px; margin: 0 auto; padding: 24px 16px 48px; }
.sidebar { position: sticky; top: 76px; align-self: start; display: flex; flex-direction: column; gap: 2px; max-height: calc(100vh - 96px); overflow: auto; }
.sidebar a { color: var(--ink-2); text-decoration: none; padding: 8px 12px; border-radius: 8px; border-left: 3px solid transparent; font-size: 15px; }
.sidebar a:hover { background: var(--paper-2); color: var(--ink); }
.sidebar a[aria-current="page"] { color: var(--accent); background: var(--paper-2); border-left-color: var(--accent); font-weight: 600; }
.toc { position: sticky; top: 76px; align-self: start; display: flex; flex-direction: column; gap: 2px; font-size: 13px; max-height: calc(100vh - 96px); overflow: auto; }
.toc p { margin: 0 0 6px; font: 600 11px var(--mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-2); }
.toc a { color: var(--ink-2); text-decoration: none; padding: 4px 0 4px 10px; border-left: 2px solid var(--rule); }
.toc a.d3 { padding-left: 22px; }
.toc a:hover { color: var(--ink); }
.toc a[aria-current="true"] { color: var(--accent); border-left-color: var(--accent); font-weight: 600; }
.content { min-width: 0; }
.content:focus { outline: none; }
.prose h1 { font: 700 clamp(30px, 5vw, 42px)/1.1 var(--serif); margin: 0 0 16px; letter-spacing: -0.01em; }
.prose h2 { font: 700 26px/1.2 var(--serif); margin: 44px 0 12px; padding-top: 8px; border-top: 1px solid var(--rule); }
.prose h3 { font: 700 19px/1.3 var(--serif); margin: 30px 0 8px; }
.prose h2 .anchor, .prose h3 .anchor { margin-left: 8px; color: var(--rule); text-decoration: none; opacity: 0; font-weight: 400; }
.prose h2:hover .anchor, .prose h3:hover .anchor, .prose .anchor:focus { opacity: 1; color: var(--accent); }
.prose p, .prose li { max-width: 74ch; }
.prose ul, .prose ol { padding-left: 22px; }
.prose li { margin: 4px 0; }
.prose code { font: 0.9em var(--mono); background: var(--code-bg); padding: 2px 6px; border-radius: 5px; overflow-wrap: anywhere; }
.code { position: relative; margin: 16px 0; }
.code pre { margin: 0; padding: 16px; padding-top: 40px; overflow-x: auto; background: var(--code-bg); border: 1px solid var(--rule); border-radius: 10px; font: 13.5px/1.55 var(--mono); }
.code pre code { background: none; padding: 0; overflow-wrap: normal; font-size: inherit; }
.copy { position: absolute; top: 8px; right: 8px; font: 600 12px var(--sans); padding: 5px 10px; border-radius: 6px; border: 1px solid var(--rule); background: var(--card); color: var(--ink-2); cursor: pointer; }
.copy:hover { color: var(--ink); border-color: var(--ink-2); }
.copy:active { transform: translateY(1px); }
.copy[data-state="done"] { color: var(--gain); border-color: var(--gain); }
.table-wrap { overflow-x: auto; margin: 16px 0; border: 1px solid var(--rule); border-radius: 10px; }
.prose table { width: 100%; border-collapse: collapse; font-size: 14px; }
.prose th, .prose td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--rule); vertical-align: top; }
.prose tr:last-child td { border-bottom: 0; }
.prose th { font: 600 11px var(--mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-2); background: var(--paper-2); white-space: nowrap; }
.prose blockquote { margin: 16px 0; padding: 4px 16px; border-left: 3px solid var(--accent); color: var(--ink-2); }
.twin { margin-top: 40px; font-size: 14px; color: var(--ink-2); }
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 32px; }
.pager a { display: block; padding: 14px 16px; border: 1px solid var(--rule); border-radius: 10px; background: var(--card); text-decoration: none; color: var(--ink); font-weight: 600; }
.pager a span { display: block; font: 600 11px var(--mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-2); margin-bottom: 4px; }
.pager a:hover { border-color: var(--accent); }
.pager .next { text-align: right; grid-column: 2; }
.foot { max-width: 1280px; margin: 0 auto; padding: 24px 16px 48px; border-top: 1px solid var(--rule); font-size: 14px; color: var(--ink-2); }
.foot p { margin: 0 0 8px; }
.foot a { margin-right: 14px; }
@media (max-width: 1100px) { .shell { grid-template-columns: 220px minmax(0, 1fr); } .toc { display: none; } }
@media (max-width: 820px) {
  .shell { grid-template-columns: minmax(0, 1fr); gap: 0; }
  .menu-btn { display: inline-block; }
  .sidebar { display: none; position: static; max-height: none; margin-bottom: 20px; padding: 8px; border: 1px solid var(--rule); border-radius: 10px; background: var(--card); }
  .sidebar.open { display: flex; }
  .bar-links a:not(:last-child) { display: none; }
  .bar-links a[href*="papertrade-os"] { display: inline; }
  .search { order: 5; flex-basis: 100%; max-width: none; }
}
@media (max-width: 480px) { .bar-links a[href*="papertrade-os"] { display: none; } .pager { grid-template-columns: 1fr; } .pager .next { grid-column: 1; } }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } .icon-btn { transition: none; } }