/* Refined Space — design system
   Warm paper, ink, brass. Mobile-first. No external fonts or images. */

:root{
  --paper:#faf7f2; --paper-2:#f3eee5; --card:#ffffff;
  --ink:#191713; --ink-2:#3b362e; --muted:#6d6559;
  --line:#e3dbcf; --line-2:#cfc5b5;
  --accent:#8a5723; --accent-2:#6d4319; --accent-soft:#f2e8d8;
  --ok:#3f6b46; --warn:#8a5b12;
  --shadow:0 1px 2px rgba(30,24,14,.05),0 8px 24px -12px rgba(30,24,14,.18);
  --serif:"Iowan Old Style","Palatino Linotype",Palatino,"Book Antiqua",Georgia,"Times New Roman",serif;
  --sans:ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,monospace;
  --wrap:74rem; --radius:10px;
}
@media (prefers-color-scheme:dark){
  :root{
    --paper:#15140f; --paper-2:#1c1a15; --card:#1f1d17;
    --ink:#ece7dd; --ink-2:#d3ccc0; --muted:#a49b8c;
    --line:#302c24; --line-2:#433d32;
    --accent:#d9a869; --accent-2:#e8c495; --accent-soft:#2a2419;
    --ok:#8fbf99; --warn:#d9b063;
    --shadow:0 1px 2px rgba(0,0,0,.4),0 10px 30px -14px rgba(0,0,0,.7);
  }
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:5rem}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation-duration:.01ms!important;transition-duration:.01ms!important}}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);
  font-size:1.0625rem;line-height:1.65;text-rendering:optimizeLegibility;
  -webkit-font-smoothing:antialiased;overflow-wrap:break-word}
img,svg{max-width:100%;height:auto}
a{color:var(--accent);text-underline-offset:.16em;text-decoration-thickness:.06em}
a:hover{color:var(--accent-2)}
:focus-visible{outline:2.5px solid var(--accent);outline-offset:2px;border-radius:3px}
.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:1.15rem}
.skip{position:absolute;left:-9999px;top:0;background:var(--ink);color:var(--paper);padding:.7rem 1rem;z-index:99}
.skip:focus{left:.5rem;top:.5rem}

/* ---------- header / nav ---------- */
.site-header{position:sticky;top:0;z-index:40;background:var(--paper);background:color-mix(in srgb,var(--paper) 88%,transparent);
  backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;gap:1rem;min-height:3.75rem;flex-wrap:wrap}
.brand{display:inline-flex;align-items:center;gap:.55rem;font-family:var(--serif);font-size:1.22rem;
  letter-spacing:.005em;color:var(--ink);text-decoration:none;font-weight:600;margin-right:auto}
.brand-mark{width:1.05rem;height:1.05rem;border:2px solid var(--accent);border-radius:2px;
  position:relative;flex:none}
.brand-mark::after{content:"";position:absolute;inset:3px 3px auto auto;width:.3rem;height:.3rem;background:var(--accent)}
.brand-thin{font-weight:400;color:var(--muted)}
.nav-toggle{display:inline-flex;align-items:center;gap:.5rem;background:transparent;border:1px solid var(--line-2);
  color:var(--ink);font:inherit;font-size:.9rem;padding:.4rem .7rem;border-radius:999px;cursor:pointer}
.nav-toggle-bars{width:1rem;height:.7rem;border-top:2px solid currentColor;border-bottom:2px solid currentColor;position:relative}
.nav-toggle-bars::after{content:"";position:absolute;top:calc(50% - 1px);left:0;right:0;border-top:2px solid currentColor}
.nav-panel{display:none;width:100%;padding-bottom:.85rem}
.nav-panel.open{display:block}
.nav-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:.1rem}
.nav-list a,.nav-list summary{display:block;padding:.55rem .35rem;color:var(--ink);text-decoration:none;
  font-size:.98rem;border-radius:6px}
.nav-list a:hover{background:var(--paper-2);color:var(--accent)}
.nav-list summary{cursor:pointer;list-style:none;font-weight:500}
.nav-list summary::-webkit-details-marker{display:none}
.nav-list summary::after{content:"";display:inline-block;width:.42rem;height:.42rem;margin-left:.45rem;
  border-right:1.6px solid var(--muted);border-bottom:1.6px solid var(--muted);transform:rotate(45deg) translateY(-2px)}
.menu ul{list-style:none;margin:.1rem 0 .4rem;padding-left:.8rem;border-left:1px solid var(--line)}
.menu a{font-size:.94rem;color:var(--ink-2)}
@media (min-width:62rem){
  .nav-toggle{display:none}
  .nav-panel{display:block;width:auto;padding:0}
  .nav-list{flex-direction:row;align-items:center;gap:.15rem}
  .nav-list>li{position:relative}
  .nav-list a,.nav-list summary{padding:.45rem .6rem;font-size:.94rem}
  .menu{position:absolute;top:calc(100% + .4rem);left:0;min-width:15rem;background:var(--card);
    border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:.4rem;z-index:50}
  .menu ul{border:0;padding:0;margin:0}
}

/* ---------- typography ---------- */
h1,h2,h3,h4{font-family:var(--serif);font-weight:600;line-height:1.18;letter-spacing:-.008em;color:var(--ink)}
h1{font-size:clamp(1.95rem,1.35rem + 2.5vw,3rem);margin:.1rem 0 .5rem}
h2{font-size:clamp(1.4rem,1.15rem + 1.05vw,1.85rem);margin:2.6rem 0 .75rem;scroll-margin-top:5rem}
h3{font-size:clamp(1.13rem,1.03rem + .5vw,1.32rem);margin:2rem 0 .5rem;scroll-margin-top:5rem}
h4{font-size:1.02rem;margin:1.5rem 0 .35rem}
p,ul,ol,dl{margin:0 0 1.05rem}
.doc-body>ul,.doc-body>ol{padding-left:1.25rem}
li{margin-bottom:.42rem}
li>ul,li>ol{margin-top:.42rem}
strong{font-weight:650;color:var(--ink)}
small,.small{font-size:.87rem;color:var(--muted)}
hr{border:0;border-top:1px solid var(--line);margin:2.5rem 0}
blockquote{margin:1.5rem 0;padding:.2rem 0 .2rem 1.1rem;border-left:3px solid var(--accent);
  font-family:var(--serif);font-size:1.08rem;color:var(--ink-2)}
code{font-family:var(--mono);font-size:.9em;background:var(--paper-2);padding:.12em .35em;border-radius:4px}
.anchor{opacity:0;margin-left:.35rem;text-decoration:none;color:var(--line-2);font-weight:400}
h2:hover .anchor,h3:hover .anchor,.anchor:focus{opacity:1}
.eyebrow{font-size:.76rem;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);
  font-weight:650;margin:0 0 .5rem}
.lede{font-size:1.16rem;line-height:1.55;color:var(--ink-2);margin:.4rem 0 .9rem;max-width:60ch}
.byline{font-size:.86rem;color:var(--muted);margin:.9rem 0 0;padding-top:.9rem;border-top:1px solid var(--line)}
.byline a{color:var(--muted);text-decoration-color:var(--line-2)}

/* ---------- doc layout ---------- */
.page-doc,.page-tool{padding-block:1.4rem 3.5rem}
@media (min-width:64rem){
  .page-doc,.page-tool{display:grid;grid-template-columns:minmax(0,1fr) 15.5rem;gap:3.2rem;
    grid-template-areas:"crumbs crumbs" "doc toc";align-items:start}
  .crumbs{grid-area:crumbs}.doc{grid-area:doc}.toc{grid-area:toc}
}
.doc{min-width:0;max-width:44rem}
.doc-body{font-size:1.075rem}
.doc-head{margin-bottom:1.6rem}
.crumbs ol{list-style:none;display:flex;flex-wrap:wrap;gap:.3rem;margin:0 0 1.1rem;padding:0;font-size:.83rem;color:var(--muted)}
.crumbs li+li::before{content:"/";margin-right:.3rem;color:var(--line-2)}
.crumbs a{color:var(--muted);text-decoration:none}
.crumbs a:hover{color:var(--accent);text-decoration:underline}
.toc{position:sticky;top:5rem;font-size:.9rem;display:none}
@media (min-width:64rem){.toc{display:block}}
.toc-h{font-family:var(--sans);font-size:.75rem;letter-spacing:.13em;text-transform:uppercase;
  color:var(--muted);margin:0 0 .6rem;font-weight:650}
.toc ol{list-style:none;margin:0;padding:0 0 0 .8rem;border-left:1px solid var(--line)}
.toc li{margin-bottom:.15rem}
.toc a{display:block;padding:.2rem 0;color:var(--ink-2);text-decoration:none;line-height:1.35}
.toc a:hover,.toc a.active{color:var(--accent)}
.toc a.active{font-weight:600}

/* ---------- answer + key numbers ---------- */
.answer{background:var(--accent-soft);border:1px solid var(--line-2);border-color:color-mix(in srgb,var(--accent) 22%,transparent);
  border-radius:var(--radius);padding:1.05rem 1.2rem;margin:0 0 1.6rem}
.answer-label{font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);
  font-weight:700;margin:0 0 .35rem}
.answer p:last-child{margin-bottom:0}
.answer p{font-size:1.06rem}
.numbers{margin:0 0 2rem;border:1px solid var(--line);border-radius:var(--radius);background:var(--card);overflow:hidden}
.numbers-h{font-family:var(--sans);font-size:.74rem;letter-spacing:.13em;text-transform:uppercase;
  color:var(--muted);margin:0;padding:.75rem 1.1rem;border-bottom:1px solid var(--line);
  background:var(--paper-2);font-weight:700}
.kn-grid{margin:0;display:grid;grid-template-columns:1fr}
@media (min-width:34rem){.kn-grid{grid-template-columns:1fr 1fr}}
.kn{padding:.85rem 1.1rem;border-bottom:1px solid var(--line)}
.kn:nth-last-child(-n+1){border-bottom:0}
@media (min-width:34rem){
  .kn:nth-child(odd){border-right:1px solid var(--line)}
  .kn:nth-last-child(-n+2):nth-child(odd){border-bottom:0}
}
.kn dt{font-size:.83rem;color:var(--muted);margin:0 0 .15rem}
.kn dd{margin:0;font-family:var(--serif);font-size:1.16rem;font-weight:600;line-height:1.3}
.kn-note{display:block;font-family:var(--sans);font-size:.8rem;font-weight:400;color:var(--muted);margin-top:.2rem}

/* ---------- tables ---------- */
.table-wrap,.doc-body table{margin:1.5rem 0}
.doc-body table{width:100%;border-collapse:collapse;font-size:.95rem;display:block;overflow-x:auto;
  border:1px solid var(--line);border-radius:var(--radius)}
@media (min-width:48rem){.doc-body table{display:table}}
.doc-body th,.doc-body td{padding:.62rem .8rem;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}
.doc-body thead th{background:var(--paper-2);font-family:var(--sans);font-size:.8rem;letter-spacing:.04em;
  text-transform:uppercase;color:var(--ink-2);font-weight:700;white-space:nowrap}
.doc-body tbody tr:last-child td{border-bottom:0}
.doc-body tbody tr:hover{background:var(--paper-2)}

/* ---------- callouts ---------- */
.callout{margin:1.6rem 0;padding:1rem 1.15rem;border-radius:var(--radius);border:1px solid var(--line);
  background:var(--card);font-size:1rem}
.callout p:last-child,.callout ul:last-child,.callout ol:last-child{margin-bottom:0}
.callout-label{font-size:.72rem;letter-spacing:.13em;text-transform:uppercase;font-weight:700;
  margin:0 0 .4rem;color:var(--muted)}
.callout-rule{border-left:3px solid var(--accent)}
.callout-rule .callout-label{color:var(--accent)}
.callout-warn{border-left:3px solid var(--warn);background:var(--card);background:color-mix(in srgb,var(--warn) 7%,var(--card))}
.callout-warn .callout-label{color:var(--warn)}
.callout-insight{border-left:3px solid var(--ok);background:var(--card);background:color-mix(in srgb,var(--ok) 7%,var(--card))}
.callout-insight .callout-label{color:var(--ok)}
.callout-example{border-left:3px solid var(--line-2)}
.callout-note{border-left:3px solid var(--line-2)}

/* ---------- plan diagrams ---------- */
.plan{margin:1.8rem 0;padding:1rem .6rem .4rem;background:var(--card);border:1px solid var(--line);
  border-radius:var(--radius);color:var(--ink)}
.plan-svg{display:block;width:100%;height:auto}
.plan figcaption{font-size:.85rem;color:var(--muted);text-align:center;padding:.5rem .8rem .4rem;line-height:1.45}
.pl-room{fill:none;stroke:var(--line-2);stroke-width:2;stroke-dasharray:6 5}
.pl-shape{stroke:var(--ink-2);stroke-width:1.5}
.pl-solid{fill:var(--paper-2);fill:color-mix(in srgb,var(--accent) 14%,var(--card))}
.pl-light{fill:var(--paper-2)}
.pl-ghost{fill:none;stroke-dasharray:5 4;stroke:var(--muted)}
.pl-accent{fill:var(--accent-soft);fill:color-mix(in srgb,var(--accent) 34%,var(--card));stroke:var(--accent)}
.pl-guide{stroke:var(--line-2);stroke-width:1.4;stroke-dasharray:4 4}
.pl-label{font-family:var(--sans);font-size:12.5px;fill:var(--ink-2)}
.pl-dim{stroke:var(--accent);stroke-width:1.4;color:var(--accent)}
.pl-tick{stroke:var(--accent);stroke-width:1.2}
.pl-dimbg{fill:var(--card)}
.pl-dimtext{font-family:var(--sans);font-size:12px;font-weight:700;fill:var(--accent)}
.pl-note{font-family:var(--sans);font-size:11.5px;fill:var(--muted)}

/* ---------- faq / sources / related ---------- */
.faq-item{border-bottom:1px solid var(--line)}
.faq-item summary{cursor:pointer;list-style:none;padding:.9rem 1.7rem .9rem 0;position:relative}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary h3{margin:0;font-size:1.05rem;display:inline}
.faq-item summary::after{content:"";position:absolute;right:.3rem;top:1.25rem;width:.5rem;height:.5rem;
  border-right:2px solid var(--accent);border-bottom:2px solid var(--accent);transform:rotate(45deg);transition:transform .18s}
.faq-item[open] summary::after{transform:rotate(-135deg)}
.faq-a{padding:0 0 1rem;color:var(--ink-2)}
.faq-a p:last-child{margin-bottom:0}
.sources ol{font-size:.92rem;color:var(--ink-2);padding-left:1.2rem}
.sources li{margin-bottom:.5rem}
.src-pub{color:var(--muted)}
.src-note{display:block;color:var(--muted);font-size:.87rem}
.src-foot{font-size:.85rem;color:var(--muted);border-top:1px solid var(--line);padding-top:.8rem}
.card-list{list-style:none;padding:0;margin:0;display:grid;gap:.75rem}
@media (min-width:40rem){.card-list{grid-template-columns:1fr 1fr}}
.card-list a{display:block;height:100%;padding:.95rem 1.1rem;background:var(--card);border:1px solid var(--line);
  border-radius:var(--radius);text-decoration:none;transition:border-color .15s,transform .15s}
.card-list a:hover{border-color:var(--accent);transform:translateY(-2px)}
.rc-title{display:block;font-family:var(--serif);font-size:1.06rem;font-weight:600;color:var(--ink);margin-bottom:.25rem}
.rc-desc{display:block;font-size:.88rem;color:var(--muted);line-height:1.45}

/* ---------- home ---------- */
.hero{padding:3rem 0 2.2rem;border-bottom:1px solid var(--line)}
.hero h1{max-width:18ch;margin-bottom:.7rem}
.hero-lede{font-size:1.15rem;max-width:56ch;color:var(--ink-2);line-height:1.6}
.hero-actions{display:flex;flex-wrap:wrap;gap:.6rem;margin-top:1.4rem}
.btn{display:inline-block;padding:.66rem 1.15rem;border-radius:999px;text-decoration:none;font-size:.95rem;
  font-weight:600;border:1px solid var(--accent);color:var(--accent);transition:background .15s,color .15s}
.btn:hover{background:var(--accent);color:var(--paper)}
.btn-primary{background:var(--accent);color:var(--paper)}
.btn-primary:hover{background:var(--accent-2);border-color:var(--accent-2);color:var(--paper)}
@media (prefers-color-scheme:dark){.btn-primary,.btn:hover{color:#15140f}}
.section{padding:2.8rem 0}
.section+.section{border-top:1px solid var(--line)}
.section-head{margin-bottom:1.4rem}
.section-head h2{margin:0 0 .35rem}
.section-head p{color:var(--muted);margin:0;max-width:60ch}
.grid{display:grid;gap:.8rem;grid-template-columns:1fr}
@media (min-width:38rem){.grid-2{grid-template-columns:1fr 1fr}}
@media (min-width:52rem){.grid-3{grid-template-columns:repeat(3,1fr)}}
@media (min-width:62rem){.grid-4{grid-template-columns:repeat(4,1fr)}}
.tile{display:block;padding:1.15rem 1.2rem;background:var(--card);border:1px solid var(--line);
  border-radius:var(--radius);text-decoration:none;transition:border-color .15s,transform .15s}
.tile:hover{border-color:var(--accent);transform:translateY(-2px)}
.tile h3{margin:0 0 .3rem;font-size:1.08rem}
.tile p{margin:0;font-size:.9rem;color:var(--muted);line-height:1.5}
.tile .tile-meta{display:block;margin-top:.55rem;font-size:.76rem;letter-spacing:.1em;text-transform:uppercase;color:var(--accent);font-weight:650}
.stat-row{display:grid;gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;grid-template-columns:1fr 1fr;margin:1.6rem 0}
@media (min-width:44rem){.stat-row{grid-template-columns:repeat(4,1fr)}}
.stat{background:var(--card);padding:1rem}
.stat b{display:block;font-family:var(--serif);font-size:1.5rem;line-height:1.1}
.stat span{font-size:.82rem;color:var(--muted)}

/* ---------- tools ---------- */
.calc{margin:1.8rem 0;border:1px solid var(--line);border-radius:var(--radius);background:var(--card);overflow:hidden}
.calc-head{padding:.8rem 1.1rem;background:var(--paper-2);border-bottom:1px solid var(--line)}
.calc-head h2,.calc-head h3{margin:0;font-size:1.05rem}
.calc-head p{margin:.2rem 0 0;font-size:.86rem;color:var(--muted)}
.calc-body{padding:1.1rem}
.field{margin-bottom:.95rem}
.field label{display:block;font-size:.86rem;font-weight:600;margin-bottom:.3rem;color:var(--ink-2)}
.field .hint{display:block;font-weight:400;color:var(--muted);font-size:.8rem;margin-top:.15rem}
.field input,.field select{width:100%;padding:.55rem .7rem;font:inherit;font-size:1rem;color:var(--ink);
  background:var(--paper);border:1px solid var(--line-2);border-radius:7px}
.field input:focus,.field select:focus{border-color:var(--accent)}
.field-row{display:grid;gap:.8rem;grid-template-columns:1fr}
@media (min-width:32rem){.field-row-2{grid-template-columns:1fr 1fr}.field-row-3{grid-template-columns:repeat(3,1fr)}}
.unit-toggle{display:inline-flex;border:1px solid var(--line-2);border-radius:999px;overflow:hidden;font-size:.85rem}
.unit-toggle button{border:0;background:transparent;color:var(--ink-2);font:inherit;padding:.32rem .85rem;cursor:pointer}
.unit-toggle button[aria-pressed="true"]{background:var(--accent);color:var(--paper)}
@media (prefers-color-scheme:dark){.unit-toggle button[aria-pressed="true"]{color:#15140f}}
.calc-out{margin-top:1rem;padding:1rem 1.1rem;background:var(--accent-soft);border-radius:8px;
  border:1px solid var(--line-2);border-color:color-mix(in srgb,var(--accent) 22%,transparent)}
.calc-out .big{font-family:var(--serif);font-size:1.55rem;font-weight:600;line-height:1.2;display:block;margin-bottom:.3rem}
.calc-out ul{margin:.6rem 0 0;padding-left:1.1rem;font-size:.93rem}
.calc-out p{margin:.25rem 0 0;font-size:.93rem;color:var(--ink-2)}
.calc-note{font-size:.84rem;color:var(--muted);margin:.8rem 0 0}
.pill{display:inline-block;font-size:.75rem;letter-spacing:.08em;text-transform:uppercase;font-weight:700;
  color:var(--accent);background:var(--accent-soft);padding:.15rem .5rem;border-radius:999px}

/* ---------- search ---------- */
.searchbox{display:flex;gap:.5rem;margin:1.2rem 0}
.searchbox input{flex:1;padding:.7rem .9rem;font:inherit;font-size:1.05rem;background:var(--card);
  color:var(--ink);border:1px solid var(--line-2);border-radius:8px}
.results{list-style:none;padding:0;margin:1.2rem 0 0}
.results li{padding:.85rem 0;border-bottom:1px solid var(--line)}
.results a{font-family:var(--serif);font-size:1.1rem;font-weight:600;text-decoration:none;color:var(--ink)}
.results a:hover{color:var(--accent)}
.results .r-cluster{font-size:.74rem;letter-spacing:.1em;text-transform:uppercase;color:var(--accent);display:block;margin-bottom:.2rem}
.results p{margin:.2rem 0 0;font-size:.9rem;color:var(--muted)}

/* ---------- index lists ---------- */
.index-list{list-style:none;padding:0;margin:1rem 0}
.index-list li{padding:.55rem 0;border-bottom:1px solid var(--line);display:flex;gap:1rem;justify-content:space-between;flex-wrap:wrap}
.index-list a{text-decoration:none;font-weight:500;color:var(--ink)}
.index-list a:hover{color:var(--accent)}
.index-list .il-note{font-size:.85rem;color:var(--muted)}
dl.gloss dt{font-family:var(--serif);font-size:1.08rem;font-weight:600;margin-top:1.4rem;scroll-margin-top:5rem}
dl.gloss dd{margin:.25rem 0 0;color:var(--ink-2)}

/* ---------- footer ---------- */
.site-footer{margin-top:3rem;border-top:1px solid var(--line);background:var(--paper-2);padding:2.5rem 0 2rem;font-size:.92rem}
.footer-grid{display:grid;gap:1.6rem;grid-template-columns:1fr 1fr;padding-bottom:2rem}
@media (min-width:52rem){.footer-grid{grid-template-columns:repeat(4,1fr)}}
.footer-grid h2{font-family:var(--sans);font-size:.74rem;letter-spacing:.13em;text-transform:uppercase;
  color:var(--muted);margin:0 0 .6rem;font-weight:700}
.footer-grid ul{list-style:none;margin:0;padding:0}
.footer-grid li{margin-bottom:.32rem}
.footer-grid a{color:var(--ink-2);text-decoration:none;font-size:.92rem}
.footer-grid a:hover{color:var(--accent);text-decoration:underline}
.footer-base{border-top:1px solid var(--line);padding-top:1.4rem;color:var(--muted);max-width:70ch}
.footer-base p{margin:0 0 .6rem}
.footer-brand{font-family:var(--serif);font-size:1.05rem;color:var(--ink);font-weight:600}
.footer-legal{font-size:.83rem}

/* ---------- calculator verdict lists ---------- */
.calc-out li{margin-bottom:.4rem}
.calc-out .v-ok{list-style:none;margin-left:-1.1rem;color:var(--ok);font-weight:600}
.calc-out .v-bad{list-style:none;margin-left:-1.1rem;color:#a8452e;font-weight:600}
.calc-out .v-warn{list-style:none;margin-left:-1.1rem;color:var(--warn);font-weight:600}
@media (prefers-color-scheme:dark){.calc-out .v-bad{color:#e39178}}
.field label .u{color:var(--muted);font-weight:400;font-size:.8rem}
.calc-fields{margin-top:1rem}
.calc-out p:first-child{margin-top:0}
.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* ---------- print ---------- */
@media print{
  :root{--paper:#fff;--card:#fff;--paper-2:#fff;--ink:#000;--ink-2:#222;--muted:#444;--line:#bbb;--line-2:#999;--accent:#000}
  .site-header,.site-footer,.toc,.crumbs,.related,.nav-panel,.skip,.anchor,.unit-toggle{display:none!important}
  body{font-size:11pt;background:#fff}
  .page-doc,.page-tool{display:block;padding:0}
  .doc{max-width:none}
  a{color:#000;text-decoration:underline}
  .doc-body a[href^="/"]::after{content:" (refinedspace.net" attr(href) ")";font-size:9pt;color:#555}
  .faq-item{page-break-inside:avoid}
  .faq-item summary::after{display:none}
  details{display:block}
  details>*{display:block!important}
  table,figure,.callout,.numbers{page-break-inside:avoid}
  h2,h3{page-break-after:avoid}
}
.nav-list a[aria-current="page"],.nav-list a.in-section{color:var(--accent);font-weight:600}
.nav-list a[aria-current="page"]{background:var(--accent-soft)}
.pagenote{margin-top:2.6rem;padding-top:1.1rem;border-top:1px solid var(--line);font-size:.88rem;color:var(--muted)}
.pagenote p{margin:0;max-width:64ch}
.pagenote strong{color:var(--ink-2)}

/* ================= second edition additions ================= */

/* ---------- wide grouped menus ---------- */
@media (min-width:62rem){
  .menu-wide{min-width:34rem;left:auto}
  .menu-wide ul{columns:2;column-gap:1.4rem}
  .menu-wide li{break-inside:avoid}
  .nav-list>li:nth-last-child(-n+3) .menu{left:auto;right:0}
}
@media (max-width:61.99rem){
  .nav-list a,.nav-list summary{padding-block:.7rem;min-height:2.75rem;display:flex;align-items:center}
  .nav-panel{max-height:calc(100dvh - 4.2rem);overflow-y:auto;overscroll-behavior:contain}
  .menu ul{columns:1}
}

/* ---------- tables that scroll instead of breaking semantics ---------- */
.table-scroll{margin:1.5rem 0;overflow-x:auto;-webkit-overflow-scrolling:touch;
  border:1px solid var(--line);border-radius:var(--radius);
  background:linear-gradient(90deg,var(--card) 30%,transparent),
             linear-gradient(90deg,transparent,var(--card) 70%) 100% 0,
             radial-gradient(farthest-side at 0 50%,rgba(120,100,70,.16),transparent),
             radial-gradient(farthest-side at 100% 50%,rgba(120,100,70,.16),transparent) 100% 0;
  background-repeat:no-repeat;background-size:2.4rem 100%,2.4rem 100%,.85rem 100%,.85rem 100%;
  background-attachment:local,local,scroll,scroll}
.doc-body .table-scroll table{display:table;width:100%;min-width:30rem;margin:0;border:0;border-radius:0}
.table-scroll:focus-visible{outline:2.5px solid var(--accent);outline-offset:2px}
@media (max-width:47.99rem){.doc-body .table-scroll table{font-size:.9rem}
  .doc-body .table-scroll th,.doc-body .table-scroll td{padding:.55rem .65rem}}

/* ---------- the "check it yourself" block ---------- */
.callout-check{border-left:3px solid var(--accent)}
.callout-check .callout-label{color:var(--accent)}
.check-list{margin:.2rem 0 0;padding-left:1.25rem;font-size:.98rem}
.check-list li{margin-bottom:.4rem}
.check-list li::marker{color:var(--accent);font-weight:700}

/* ---------- mobile table of contents ---------- */
.toc-m{margin:0 0 1.7rem;border:1px solid var(--line);border-radius:var(--radius);background:var(--card)}
@media (min-width:64rem){.toc-m{display:none}}
.toc-m>summary{cursor:pointer;list-style:none;padding:.8rem 1.05rem;font-size:.76rem;letter-spacing:.13em;
  text-transform:uppercase;color:var(--muted);font-weight:700;position:relative;min-height:2.75rem;
  display:flex;align-items:center}
.toc-m>summary::-webkit-details-marker{display:none}
.toc-m>summary::after{content:"";position:absolute;right:1.05rem;top:1.15rem;width:.45rem;height:.45rem;
  border-right:2px solid var(--accent);border-bottom:2px solid var(--accent);transform:rotate(45deg);transition:transform .18s}
.toc-m[open]>summary::after{transform:rotate(-135deg)}
.toc-m ol{margin:0;padding:0 1.05rem 1rem 2.1rem;font-size:.96rem}
.toc-m li{margin-bottom:.42rem}
.toc-m a{color:var(--ink-2);text-decoration:none}
.toc-m a:hover{color:var(--accent)}

/* ---------- previous / next in section ---------- */
.pager{display:grid;gap:.7rem;margin:2.4rem 0 0;grid-template-columns:1fr}
@media (min-width:40rem){.pager{grid-template-columns:1fr 1fr}}
.pager a{display:block;padding:.9rem 1.05rem;border:1px solid var(--line);border-radius:var(--radius);
  background:var(--card);text-decoration:none;transition:border-color .15s}
.pager a:hover{border-color:var(--accent)}
.pager-next{text-align:right}
@media (min-width:40rem){.pager-next:only-child{grid-column:2}}
.pager-dir{display:block;font-size:.7rem;letter-spacing:.13em;text-transform:uppercase;color:var(--muted);
  font-weight:700;margin-bottom:.2rem}
.pager-title{display:block;font-family:var(--serif);font-size:1rem;font-weight:600;color:var(--ink);line-height:1.35}

/* ---------- section hub extras ---------- */
.hub-strip{display:grid;gap:.7rem;grid-template-columns:1fr 1fr;margin:1.6rem 0 0}
@media (min-width:52rem){.hub-strip{grid-template-columns:repeat(4,1fr)}}
.hub-strip a{display:block;padding:.75rem .9rem;border:1px solid var(--line);border-radius:var(--radius);
  background:var(--card);text-decoration:none;font-size:.92rem;color:var(--ink-2);transition:border-color .15s}
.hub-strip a:hover{border-color:var(--accent);color:var(--accent)}

/* ---------- advertising slots ---------- */
.ad-slot{margin:2.2rem 0;text-align:center;line-height:0}
.ad-slot:empty{display:none}
.ad-slot>ins{display:block}
.ad-slot::before{content:"Advertisement";display:block;font-family:var(--sans);font-size:.66rem;
  letter-spacing:.14em;text-transform:uppercase;color:var(--muted);line-height:1.6;margin-bottom:.35rem}
.ad-slot:empty::before{content:none}

/* ---------- misc polish ---------- */
.doc-body h2{scroll-margin-top:5rem}
.doc-body h3{scroll-margin-top:5rem}
h2:hover>.anchor,h3:hover>.anchor,.anchor:focus{opacity:1;color:var(--accent)}
@media (hover:none){.anchor{display:none}}
.crumbs li{max-width:100%}
@media (max-width:39.99rem){
  .doc-body{font-size:1.05rem}
  .answer{padding:.95rem 1rem}
  .kn dd{font-size:1.1rem}
  h1{font-size:1.72rem;line-height:1.2}
}
@media print{.pager,.toc-m,.ad-slot{display:none!important}}

/* ---------- back to top ---------- */
.to-top{position:fixed;right:max(.9rem,env(safe-area-inset-right));bottom:max(.9rem,env(safe-area-inset-bottom));
  z-index:35;display:inline-flex;align-items:center;justify-content:center;width:2.9rem;height:2.9rem;
  border-radius:999px;border:1px solid var(--line-2);background:var(--card);color:var(--ink-2);
  box-shadow:var(--shadow);cursor:pointer;opacity:0;visibility:hidden;transform:translateY(.5rem);
  transition:opacity .18s,transform .18s,visibility .18s}
.to-top.show{opacity:1;visibility:visible;transform:none}
.to-top:hover{color:var(--accent);border-color:var(--accent)}
.to-top svg{width:1.05rem;height:1.05rem;display:block}
@media (min-width:64rem){.to-top{display:none}}
@media print{.to-top{display:none!important}}

/* ---------- touch and target polish ---------- */
.faq-item summary{min-height:2.9rem;display:flex;align-items:center}
.faq-item summary h3{font-size:1.02rem}
.toc a{padding-block:.32rem}
.doc-body h2:target,.doc-body h3:target,.faq-item:target{scroll-margin-top:5rem}
.doc-body h2:target{background:var(--accent-soft);box-shadow:-.5rem 0 0 var(--accent-soft),.5rem 0 0 var(--accent-soft);
  border-radius:2px}
.unit-toggle button{min-height:2.4rem}
.field input,.field select{min-height:2.75rem}
.btn{min-height:2.75rem;display:inline-flex;align-items:center;justify-content:center}
.hero-actions .btn{flex:1 1 auto;text-align:center}
@media (min-width:34rem){.hero-actions .btn{flex:0 0 auto}}
.site-footer{padding-bottom:max(2rem,calc(env(safe-area-inset-bottom) + 1rem))}
body{padding-bottom:env(safe-area-inset-bottom)}
@media (max-width:39.99rem){
  .wrap{padding-inline:1rem}
  .card-list a,.tile{padding:.9rem 1rem}
  .stat b{font-size:1.35rem}
}