/* Realization Engine — paper stylesheet (variant-B aligned) */

:root {
  --paper: #fdfcf8;
  --paper-2: #f7f3ea;
  --ink: #18140f;
  --ink-2: #3a3226;
  --ink-3: #756a58;
  --rule: #18140f;
  --rule-faint: rgba(24, 20, 15, 0.16);
  --serif: "Source Serif 4", "Source Serif Pro", "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #13110d;
    --paper-2: #1b1813;
    --ink: #ede2c9;
    --ink-2: #c8bda4;
    --ink-3: #8a7f6b;
    --rule: #ede2c9;
    --rule-faint: rgba(237, 226, 201, 0.18);
  }
}
html[data-theme="light"] {
  --paper: #fdfcf8; --paper-2: #f7f3ea;
  --ink: #18140f; --ink-2: #3a3226; --ink-3: #756a58;
  --rule: #18140f; --rule-faint: rgba(24, 20, 15, 0.16);
}
html[data-theme="dark"] {
  --paper: #13110d; --paper-2: #1b1813;
  --ink: #ede2c9; --ink-2: #c8bda4; --ink-3: #8a7f6b;
  --rule: #ede2c9; --rule-faint: rgba(237, 226, 201, 0.18);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 19px;
  line-height: 1.55;
  font-feature-settings: "onum" 1, "kern" 1, "liga" 1;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
::selection { background: var(--ink); color: var(--paper); }
a { color: inherit; text-decoration: none; }
a:focus-visible { outline: 2px solid var(--ink); outline-offset: 3px; }

.page { max-width: 1100px; margin: 0 auto; padding: 68px 56px 80px; }
@media (max-width: 720px) { .page { padding: 56px 22px 56px; } }

/* ───────── Theme toggle ───────── */
.theme-toggle {
  position: fixed;
  top: 18px;
  right: 22px;
  z-index: 20;
  display: flex;
  gap: 2px;
  background: var(--paper-2);
  border: 1px solid var(--rule-faint);
  border-radius: 999px;
  padding: 3px;
  font-family: var(--mono);
  font-size: 10.5px;
}
.theme-toggle button {
  background: transparent;
  color: var(--ink-3);
  border: 0;
  padding: 6px 10px;
  cursor: pointer;
  font: inherit;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border-radius: 999px;
}
.theme-toggle button[aria-pressed="true"] {
  background: var(--ink);
  color: var(--paper);
}

/* ───────── Masthead ───────── */
.topbar {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 24px;
  padding-bottom: 10px;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-3);
  border-bottom: 1px solid var(--rule-faint);
}
.topbar > div { white-space: nowrap; }
@media (max-width: 720px) {
  .topbar { grid-template-columns: 1fr; gap: 4px; }
  .topbar .mid, .topbar .right { text-align: left; }
  .topbar > div { white-space: normal; }
}
.topbar .mid { text-align: center; }
.topbar .right { text-align: right; }
.topbar a { color: inherit; }
.topbar a:hover { color: var(--ink); }

/* ───────── Banner / paper title ───────── */
.banner {
  padding: 88px 0 56px;
  border-bottom: 2px solid var(--rule);
}
.paper-title {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(48px, 7vw, 92px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  margin: 0;
  color: var(--ink);
  max-width: 18ch;
}
.paper-title em {
  font-style: italic;
  font-weight: 400;
}
.banner .subline {
  margin-top: 44px;
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: 48px;
  align-items: end;
}
.banner .tag {
  font-family: var(--serif);
  font-style: italic;
  font-size: clamp(18px, 1.7vw, 22px);
  line-height: 1.35;
  color: var(--ink-2);
  margin: 0;
  max-width: 44ch;
}
.banner .meta {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-3);
  text-align: right;
  line-height: 1.7;
}
.banner .meta span { display: block; }
@media (max-width: 720px) {
  .banner { padding: 48px 0 32px; }
  .banner .subline { grid-template-columns: 1fr; gap: 22px; }
  .banner .meta { text-align: left; }
}

/* ───────── Article body ───────── */
.paper {
  padding: 56px 0 24px;
}
.paper p,
.paper ul,
.paper ol,
.paper blockquote {
  margin: 0 0 1.1em;
  color: var(--ink);
}
.paper p:last-child { margin-bottom: 0; }

/* Drop cap on the first body paragraph, which follows the first H2. */
.paper > h2:first-of-type + p::first-letter {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 5.2em;
  line-height: 0.88;
  float: left;
  padding: 6px 14px 0 0;
  margin-top: 2px;
  color: var(--ink);
}

/* Headings */
.paper h2 {
  font-family: var(--mono);
  font-weight: 500;
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 3.2em 0 1.2em;
  padding-top: 1.2em;
  border-top: 1px solid var(--rule-faint);
}
.paper > h2:first-of-type {
  margin-top: 0;
  border-top: none;
  padding-top: 0;
}
.paper h3 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.1em;
  line-height: 1.25;
  color: var(--ink);
  margin: 2em 0 0.6em;
  letter-spacing: -0.005em;
}
.paper h4 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1em;
  line-height: 1.3;
  color: var(--ink);
  margin: 1.4em 0 0.4em;
}

/* Links in prose */
.paper a {
  color: var(--ink);
  background-image: linear-gradient(var(--rule), var(--rule));
  background-size: 100% 1px;
  background-position: 0 100%;
  background-repeat: no-repeat;
  padding-bottom: 2px;
  transition: opacity 200ms ease;
}
.paper a:hover { opacity: 0.6; }

/* Emphasis */
.paper em { font-style: italic; }
.paper strong { font-weight: 600; }

/* FORCE term: authored as ***<small>FORCE</small>*** in the markdown,
   i.e. a <small> wrapped in strong+em. Rendered as full-size small-caps
   so it reads as a distinctive capability term rather than shrunken text. */
.paper strong em small,
.paper em strong small {
  font-variant: small-caps;
  font-size: 1em;
  letter-spacing: 0.04em;
}

/* SVG diagrams authored with light-mode hex values. Theming happens via
   attribute selectors so the source SVG stays untouched. Saturated accent
   colors (blue/red/green/orange/purple/gold/brown) are intentionally left
   as-authored; they remain legible on both paper and dark backgrounds. */
.paper svg [stroke="#1a1a2e"] { stroke: var(--ink); }
.paper svg [fill="#1a1a2e"]   { fill:   var(--ink); }
.paper svg [stroke="#333"]    { stroke: var(--ink); }
.paper svg [fill="#333"]      { fill:   var(--ink); }
.paper svg [stroke="#555"]    { stroke: var(--ink-3); }
.paper svg [fill="#555"]      { fill:   var(--ink-3); }
.paper svg [stroke="#888"]    { stroke: var(--ink-3); }
.paper svg [fill="#888"]      { fill:   var(--ink-3); }
.paper svg [stroke="#ccc"]    { stroke: var(--rule-faint); }
.paper svg [fill="#ccc"]      { fill:   var(--rule-faint); }
.paper svg [stroke="#ddd"]    { stroke: var(--rule-faint); }
.paper svg [fill="#ddd"]      { fill:   var(--rule-faint); }
.paper svg [fill="#f5f5f5"]   { fill:   var(--paper-2); }

/* Blockquotes — used for pull-quotes and sample passages */
.paper blockquote {
  margin: 1.4em 0;
  padding: 0.2em 0 0.2em 1.4em;
  border-left: 2px solid var(--rule);
  color: var(--ink-2);
  font-style: italic;
}
.paper blockquote p:last-child { margin-bottom: 0; }

/* Lists */
.paper ul, .paper ol { padding-left: 1.6em; }
.paper li { margin: 0.3em 0; }

/* Inline code */
.paper code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--paper-2);
  padding: 0.12em 0.35em;
  border-radius: 3px;
}
.paper pre {
  background: var(--paper-2);
  padding: 1em 1.2em;
  border-radius: 6px;
  overflow-x: auto;
  line-height: 1.5;
  font-size: 0.9em;
}
.paper pre code {
  background: none;
  padding: 0;
  border-radius: 0;
  font-size: inherit;
}

/* Horizontal rules */
.paper hr {
  border: 0;
  border-top: 1px solid var(--rule-faint);
  margin: 2.4em 0;
}

/* Tables */
.paper table {
  border-collapse: collapse;
  width: 100%;
  margin: 1.4em 0;
  font-size: 0.95em;
}
.paper th, .paper td {
  border-bottom: 1px solid var(--rule-faint);
  padding: 0.55em 0.75em;
  text-align: left;
  vertical-align: top;
}
.paper th {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
  font-weight: 500;
  border-bottom: 1px solid var(--rule);
}

/* Images */
.paper img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 1.4em auto;
}

/* ───────── Paper nav (prev/next between parts) ───────── */
.paper-nav {
  display: flex;
  justify-content: space-between;
  align-items: stretch;
  gap: 20px;
  margin: 48px 0 0;
  padding: 24px 0;
  border-top: 1px solid var(--rule-faint);
  border-bottom: 1px solid var(--rule-faint);
}
.paper-nav a {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px 16px;
  border: 1px solid var(--rule-faint);
  border-radius: 6px;
  color: var(--ink);
  text-decoration: none;
  flex: 1 1 0;
  max-width: 48%;
  transition: background-color 150ms ease;
}
.paper-nav a:hover {
  background: var(--paper-2);
}
.paper-nav .nav-label {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.paper-nav .nav-title {
  font-family: var(--serif);
  font-size: 15px;
  line-height: 1.35;
  color: var(--ink);
}
.paper-nav .nav-next {
  margin-left: auto;
  text-align: right;
}
@media (max-width: 720px) {
  .paper-nav { flex-direction: column; gap: 12px; }
  .paper-nav a { max-width: 100%; }
  .paper-nav .nav-next { margin-left: 0; text-align: left; }
}

/* ───────── Colophon ───────── */
.colophon-bar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 48px;
  padding: 48px 0 24px;
  margin-top: 56px;
  border-top: 1px solid var(--rule);
}
.colophon-bar h4 {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-3);
  font-weight: 500;
  margin: 0 0 12px;
}
.colophon-bar .about {
  font-size: 14px;
  line-height: 1.55;
  color: var(--ink-2);
  margin: 0;
  max-width: 40ch;
}
.colophon-bar dl {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 14px;
  margin: 0;
  font-size: 13px;
}
.colophon-bar dt {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-3);
  font-weight: 500;
  align-self: baseline;
  padding-top: 2px;
}
.colophon-bar dd {
  margin: 0;
  color: var(--ink-2);
}
.colophon-bar dd a {
  color: var(--ink-2);
  border-bottom: 1px solid var(--rule-faint);
}
.colophon-bar dd a:hover { color: var(--ink); }
@media (max-width: 720px) {
  .colophon-bar { grid-template-columns: 1fr; gap: 28px; }
}

/* ───────── Foot ───────── */
.foot {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding-top: 18px;
  border-top: 1px solid var(--rule-faint);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.foot a { color: inherit; }
.foot a:hover { color: var(--ink); }