/* ============================================================
   Walnut Reader — site furniture shared by the front-matter
   pages (privacy, support). The marketing site's own index.html
   keeps its stylesheet inline; these two pages link this file so
   the legal copy stays in one place.

   The language is the same: paper, running head, mono labels in
   copper, a display serif for anything meant to be read.
   ============================================================ */

:root{
  --paper:#f7f2ea;
  --card:#fffdf8;
  --ink:#1f1a13;
  --ink-soft:#544737;
  --muted:#8a7a68;
  --line:#e5d9c7;
  --rule:#d9cbb6;
  --copper:#b4551f;
  --copper-soft:#f3e2d2;
  --badge:#111111;
  --badge-ink:#ffffff;
  --plate:#efe6d6;
  --shadow:0 1px 2px rgba(31,26,19,.05), 0 18px 44px -26px rgba(31,26,19,.45);
  --display: ui-serif, "New York", "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Times New Roman", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;
}

html[data-theme="sepia"]{
  --paper:#f2e4ca;
  --card:#fbf1de;
  --ink:#372b1d;
  --ink-soft:#5d4b36;
  --muted:#8a7458;
  --line:#e2d1b0;
  --rule:#d8c39d;
  --copper:#a4511c;
  --copper-soft:#eeddc0;
  --plate:#e9d9ba;
  --shadow:0 1px 2px rgba(55,43,29,.06), 0 18px 44px -26px rgba(55,43,29,.45);
}

/* Dark is a TRUE black page — the same choice the reader makes. */
html[data-theme="dark"]{
  color-scheme: dark;
  --paper:#000000;
  --card:#0c0b0a;
  --ink:#e8e3da;
  --ink-soft:#b6ada1;
  --muted:#8c8477;
  --line:#252320;
  --rule:#1d1b19;
  --copper:#e0a165;
  --copper-soft:#241a11;
  --badge:#f4efe6;
  --badge-ink:#000000;
  --plate:#191715;
  --shadow:0 1px 2px rgba(0,0,0,.6), 0 18px 44px -26px rgba(0,0,0,.9);
}

*{ margin:0; padding:0; box-sizing:border-box }
html{ scroll-behavior:smooth; -webkit-text-size-adjust:100% }
body{
  font-family:var(--sans);
  background:var(--paper);
  color:var(--ink);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  font-size:17px;
}
img{ max-width:100%; display:block }
a{ color:var(--copper); text-decoration:none }
a:hover{ text-decoration:underline }
p{ text-wrap:pretty }
h1,h2,h3{ text-wrap:balance }
:focus-visible{ outline:2px solid var(--copper); outline-offset:3px; border-radius:4px }

.wrap{ max-width:1140px; margin:0 auto; padding:0 34px }
.skip{
  position:absolute; left:-9999px; top:0; background:var(--ink); color:var(--paper);
  padding:12px 18px; z-index:50; border-radius:0 0 8px 0;
}
.skip:focus{ left:0 }

/* ---------- Running head ---------- */
.masthead{
  position:sticky; top:0; z-index:20;
  background:var(--paper);
  border-bottom:1px solid var(--rule);
}
.masthead-inner{
  max-width:1140px; margin:0 auto; padding:0 34px;
  height:52px; display:flex; align-items:center; gap:20px;
}
.brand{ display:flex; align-items:center; gap:9px; color:var(--ink); font-weight:600; font-size:15px; letter-spacing:-.01em; white-space:nowrap }
.brand img{ width:24px; height:24px; border-radius:6px }
.brand:hover{ text-decoration:none }
.running{
  margin-left:auto; font-family:var(--mono); font-size:11px; letter-spacing:.16em;
  text-transform:uppercase; color:var(--muted); white-space:nowrap;
  overflow:hidden; text-overflow:ellipsis;
}
.themes{ display:flex; gap:2px; padding:3px; border:1px solid var(--line); border-radius:999px; background:var(--card) }
.themes button{
  font:inherit; font-size:11px; font-weight:600; letter-spacing:.04em;
  color:var(--ink-soft); background:none; border:0; cursor:pointer;
  padding:8px 11px; min-height:34px; border-radius:999px;
}
.themes button[aria-pressed="true"]{ background:var(--ink); color:var(--paper) }
.progress{ position:absolute; left:0; bottom:-1px; height:2px; width:0; background:var(--copper) }

/* ---------- Bookmark ribbon (progress + back to top) ---------- */
.ribbon{
  position:fixed; right:22px; bottom:22px; z-index:30;
  width:48px; height:62px; padding:0; cursor:pointer;
  border:0; border-radius:9px 9px 4px 4px;
  background:var(--copper); color:var(--paper);
  font-family:var(--mono); font-size:11px; font-weight:600; letter-spacing:.02em;
  clip-path:polygon(0 0,100% 0,100% 100%,50% 76%,0 100%);
  box-shadow:0 10px 26px -12px rgba(0,0,0,.5);
  opacity:0; transform:translateY(8px); transition:opacity .3s ease, transform .3s ease;
}
.ribbon.on{ opacity:1; transform:none }
.ribbon span{ display:block; padding-bottom:10px }

/* ---------- Title block of a front-matter page ---------- */
.doc-head{ padding:70px 0 52px }
.eyebrow{
  font-family:var(--mono); font-size:11px; letter-spacing:.18em; text-transform:uppercase;
  color:var(--copper); margin-bottom:20px;
}
.doc-head h1{
  font-family:var(--display); font-weight:600; font-size:clamp(38px,5vw,64px);
  line-height:1.02; letter-spacing:-.028em;
}
.doc-head h1 em{ font-style:italic; color:var(--copper) }
.doc-head .lede{ margin-top:22px; font-size:19px; color:var(--ink-soft); max-width:31em }
.doc-head .lede::first-letter{
  float:left; font-family:var(--display); font-size:3.5em; line-height:.78;
  font-weight:600; color:var(--copper); padding:.06em .1em 0 0;
}
.meta{
  font-family:var(--mono); font-size:11.5px; letter-spacing:.13em; text-transform:uppercase;
  color:var(--muted); margin-top:26px; display:flex; flex-wrap:wrap; gap:8px 16px;
}
.meta span{ white-space:nowrap }

/* ---------- Contents ---------- */
.contents{ border-top:1px solid var(--rule); border-bottom:1px solid var(--rule); padding:34px 0 38px }
.contents h2{
  font-family:var(--mono); font-size:11px; letter-spacing:.2em; text-transform:uppercase;
  color:var(--muted); font-weight:600; margin-bottom:18px;
}
.toc{ display:grid; grid-template-columns:1fr 1fr; gap:2px 56px }
.toc a{
  display:grid; grid-template-columns:2.1em 1fr auto; align-items:baseline; gap:10px;
  padding:8px 0; color:var(--ink); border-bottom:1px dotted var(--rule);
}
.toc a:hover{ text-decoration:none; color:var(--copper) }
.toc .n{ font-family:var(--mono); font-size:12px; color:var(--copper) }
.toc .t{ font-family:var(--display); font-size:17px; letter-spacing:-.01em }
.toc .d{ font-size:12.5px; color:var(--muted); font-family:var(--mono) }

/* ---------- Numbered sections ---------- */
/* .section is the band (its hairline spans the page); .section-grid inside a
   .wrap is the three-column layout: number, prose, marginal notes. */
.section{ border-top:1px solid var(--rule); scroll-margin-top:70px }
.contents + .section{ border-top:0 }   /* the contents band already draws that rule */
.section-grid{
  display:grid; grid-template-columns:78px minmax(0,1fr) 272px; gap:38px;
  /* vertical only — the horizontal inset belongs to .wrap, and a `padding`
     shorthand here would silently zero it */
  padding-top:48px; padding-bottom:52px;
}
.section-grid.wide{ grid-template-columns:78px minmax(0,1fr) }
.section-grid .num{
  font-family:var(--mono); font-size:12px; letter-spacing:.14em; color:var(--copper);
  font-weight:600; padding-top:7px;
}
.section h2{
  font-family:var(--display); font-weight:600; font-size:clamp(24px,2.7vw,33px);
  line-height:1.1; letter-spacing:-.022em; margin-bottom:14px;
}
.section h2 em{ font-style:italic }
.section h3{
  font-family:var(--display); font-size:20px; font-weight:600; letter-spacing:-.012em;
  margin:26px 0 6px;
}
.body p{ color:var(--ink-soft); max-width:37em; margin-bottom:14px }
.body p strong{ color:var(--ink); font-weight:600 }
.body p:last-child{ margin-bottom:0 }
.body .mono, .mono{ font-family:var(--mono); font-size:.88em }

.statement{
  font-family:var(--display); font-size:clamp(21px,2.5vw,29px); line-height:1.25;
  letter-spacing:-.02em; color:var(--ink); max-width:26em; margin-bottom:22px;
}
.statement em{ font-style:italic; color:var(--copper) }
.absent{ display:flex; flex-wrap:wrap; gap:10px; margin-top:22px }
.absent span{
  font-family:var(--mono); font-size:11.5px; letter-spacing:.06em; color:var(--ink-soft);
  border:1px solid var(--line); border-radius:999px; padding:8px 14px; background:var(--paper);
}

.ledger{ list-style:none; border-top:1px solid var(--line); margin-top:14px }
.ledger li{
  padding:11px 0; border-bottom:1px solid var(--line); font-size:15px;
  line-height:1.55; color:var(--ink-soft);
}
.ledger li b{ color:var(--ink); font-weight:600 }
.ledger li:last-child{ border-bottom:0 }

/* marginal notes */
.aside{ display:flex; flex-direction:column; gap:18px; padding-top:4px }
.note{ border-top:1px solid var(--rule); padding-top:11px; font-size:14px; line-height:1.55; color:var(--ink-soft) }
.note b{
  display:block; font-family:var(--mono); font-size:10.5px; letter-spacing:.15em;
  text-transform:uppercase; color:var(--copper); margin-bottom:5px; font-weight:600;
}
.box{ border:1px solid var(--line); border-radius:14px; padding:18px; background:var(--card); font-size:14px; line-height:1.55; color:var(--ink-soft) }
.box h4{
  font-family:var(--mono); font-size:10.5px; letter-spacing:.15em; text-transform:uppercase;
  color:var(--muted); font-weight:600; margin-bottom:10px;
}
.box a{ word-break:break-word }

/* ---------- Closing note + footer ---------- */
.done{ padding:56px 0 40px; border-top:1px solid var(--rule) }
.done h2{ font-family:var(--display); font-weight:600; font-size:clamp(24px,3vw,36px); letter-spacing:-.024em; margin-bottom:16px }
.done p{ color:var(--ink-soft); max-width:38em; margin-bottom:14px }
footer{ border-top:1px solid var(--rule); padding:34px 0 46px; margin-top:44px }
footer .wrap{ display:flex; justify-content:space-between; align-items:center; gap:18px; flex-wrap:wrap }
.fbrand{ display:flex; align-items:center; gap:10px; font-size:14px; font-weight:600 }
.fbrand img{ width:24px; height:24px; border-radius:6px }
.fine{ font-size:13px; color:var(--muted) }
.flinks{ display:flex; flex-wrap:wrap; gap:6px 20px }
.flinks a{
  font-family:var(--mono); font-size:11.5px; letter-spacing:.12em; text-transform:uppercase;
  color:var(--ink-soft);
}
.flinks a:hover{ color:var(--copper) }

/* ---------- Page menu (hamburger → slide-in contents) ---------- */
.menu-btn{
  font:inherit; cursor:pointer; flex-shrink:0;
  width:44px; height:38px; padding:0;
  display:inline-flex; flex-direction:column; align-items:center; justify-content:center; gap:4px;
  border:1px solid var(--line); border-radius:11px; background:var(--card); color:var(--ink);
}
.menu-btn:hover{ border-color:var(--rule) }
.menu-btn i{
  display:block; width:17px; height:1.5px; border-radius:2px; background:currentColor;
  transition:transform .22s ease, opacity .18s ease;
}
.menu-btn[aria-expanded="true"] i:nth-child(1){ transform:translateY(5.5px) rotate(45deg) }
.menu-btn[aria-expanded="true"] i:nth-child(2){ opacity:0 }
.menu-btn[aria-expanded="true"] i:nth-child(3){ transform:translateY(-5.5px) rotate(-45deg) }

.menu-scrim{
  position:fixed; inset:0; z-index:38; background:rgba(20,17,13,.42);
  opacity:0; visibility:hidden;
  /* visibility flips instantly on OPEN (so the panel is focusable at once) and
     waits for the fade on CLOSE — a plain `visibility .28s` would swallow focus() */
  transition:opacity .28s ease, visibility 0s linear .28s;
  -webkit-backdrop-filter:blur(2px); backdrop-filter:blur(2px);
}
html[data-theme="dark"] .menu-scrim{ background:rgba(0,0,0,.62) }
.menu-scrim.on{ opacity:1; visibility:visible; transition:opacity .28s ease, visibility 0s linear 0s }

.menu{
  position:fixed; top:0; right:0; bottom:0; z-index:39;
  width:min(330px,88vw); padding:18px 22px 24px;
  display:flex; flex-direction:column;
  background:var(--card); border-left:1px solid var(--rule);
  box-shadow:-26px 0 60px -30px rgba(31,26,19,.6);
  overflow-y:auto; visibility:hidden; transform:translateX(102%);
  transition:transform .3s cubic-bezier(.32,.72,.28,1), visibility 0s linear .3s;
}
.menu.on{ transform:none; visibility:visible; transition:transform .3s cubic-bezier(.32,.72,.28,1), visibility 0s linear 0s }
.menu-head{
  display:flex; align-items:center; justify-content:space-between; gap:12px;
  padding-bottom:13px; border-bottom:1px solid var(--rule);
}
.menu-head h2{
  font-family:var(--mono); font-size:10.5px; letter-spacing:.2em; text-transform:uppercase;
  color:var(--muted); font-weight:600;
}
.menu-close{
  font:inherit; cursor:pointer; padding:8px 13px; min-height:38px;
  font-family:var(--mono); font-size:11px; letter-spacing:.12em; text-transform:uppercase;
  color:var(--ink-soft); background:none; border:1px solid var(--line); border-radius:11px;
}
.menu-close:hover{ border-color:var(--rule); color:var(--ink) }
.menu a.page{
  display:grid; grid-template-columns:2.2em 1fr auto; align-items:baseline; gap:10px;
  padding:15px 0; border-bottom:1px solid var(--line); color:var(--ink);
}
.menu a.page:hover{ text-decoration:none; color:var(--copper) }
.menu a.page[aria-current="page"] .pt{ color:var(--copper) }
.menu .pn{ font-family:var(--mono); font-size:12px; color:var(--copper) }
.menu .pt{ font-family:var(--display); font-size:19px; letter-spacing:-.012em }
.menu .ph{
  font-family:var(--mono); font-size:10.5px; letter-spacing:.09em; text-transform:uppercase;
  color:var(--muted); text-align:right;
}
.menu-foot{ margin-top:auto; padding-top:18px; border-top:1px solid var(--rule) }
.menu-foot p{ font-size:13px; color:var(--muted); margin-bottom:6px }
.menu-foot a{ font-family:var(--mono); font-size:12px }

/* ---------- Motion ---------- */
.reveal{ opacity:0; transform:translateY(12px); transition:opacity .55s ease, transform .55s ease }
.reveal.in{ opacity:1; transform:none }
.no-js .reveal{ opacity:1; transform:none }
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto }
  .reveal{ opacity:1; transform:none; transition:none }
  .ribbon{ transition:none }
  .menu, .menu-scrim, .menu-btn i{ transition:none }
}

/* ---------- Responsive ---------- */
@media (max-width:1080px){
  .section-grid, .section-grid.wide{ grid-template-columns:minmax(0,1fr); gap:0 }
  .section-grid .num{ padding-top:0; margin-bottom:8px }
  .aside{ margin-top:30px; display:grid; grid-template-columns:1fr 1fr; gap:18px 26px }
  .aside .box{ grid-column:1 / -1 }
}
@media (max-width:900px){
  .toc{ grid-template-columns:1fr }
  .running{ display:none }
  /* the running head carries the bar's auto margin on wide screens; with it
     hidden, the theme group takes over so the pills + menu stay hard right */
  .themes{ margin-left:auto }
}
@media (max-width:620px){
  body{ font-size:16.5px }
  .wrap, .masthead-inner{ padding:0 20px }
  /* the wordmark and four theme pills cannot share a 390px bar — keep the
     mark, drop the words (the link keeps its aria-label) */
  .brand span{ display:none }
  .masthead-inner{ gap:12px }
  .themes button{ padding:9px 12px; min-height:38px }
  .aside{ grid-template-columns:1fr }
  .ribbon{ right:14px; bottom:14px }
  .doc-head{ padding:52px 0 40px }
  .section-grid{ padding-top:36px; padding-bottom:40px }
}
/* very narrow bars: tighten the pills so the menu button stays on the edge */
@media (max-width:380px){
  .masthead-inner{ gap:10px }
  .themes button{ padding:8px 10px; font-size:10.5px }
}