/* The Refit Brief — v1 stylesheet. No external fonts or frameworks. */
:root{
  --paper:#f5f1e8;
  --paper-2:#ece6d8;
  --card:#fffdf8;
  --ink:#1b2430;
  --ink-2:#3b4654;
  --muted:#5a6470;
  --rule:#d6cdb9;
  --rust:#b4441c;      /* accent: signal / warning-tape */
  --sea:#1f5a5c;       /* links */
  --sea-2:#2d7a7c;
  --chart:#e7efe9;     /* pale chart green */
  --serif:"Iowan Old Style","Charter","Bitstream Charter","Sitka Text",Cambria,Georgia,serif;
  --sans:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --mono:ui-monospace,"SFMono-Regular","Menlo","Consolas","Liberation Mono",monospace;
  --wrap:72rem;
  --measure:40rem;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--serif);font-size:1.0625rem;line-height:1.65}
@media (min-width:48rem){body{font-size:1.125rem}}
img,svg{max-width:100%;height:auto}
a{color:var(--sea);text-underline-offset:.18em;text-decoration-thickness:1px}
a:hover{color:var(--rust)}
:focus-visible{outline:3px solid var(--rust);outline-offset:2px}
.skip{position:absolute;left:-999px;top:0;background:var(--ink);color:var(--paper);padding:.5rem 1rem;z-index:10}
.skip:focus{left:.5rem;top:.5rem}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 1.25rem}

/* ---------- Header ---------- */
.site-header{background:var(--paper);border-bottom:2px solid var(--ink)}
.bar{display:flex;align-items:center;justify-content:space-between;gap:1rem;min-height:4rem}
.brand{display:flex;align-items:center;gap:.6rem;color:var(--ink);text-decoration:none;font-family:var(--sans);font-weight:800;letter-spacing:.02em;text-transform:uppercase;font-size:.95rem}
.brand svg{width:34px;height:34px;flex:none}
.brand small{display:block;font-weight:500;text-transform:none;letter-spacing:0;color:var(--muted);font-size:.72rem}
.nav-toggle{font-family:var(--sans);font-weight:700;font-size:.85rem;background:none;border:2px solid var(--ink);color:var(--ink);padding:.4rem .75rem;border-radius:3px;cursor:pointer}
.site-nav ul{list-style:none;margin:0;padding:0}
.site-nav a{font-family:var(--sans);font-weight:600;font-size:.92rem;color:var(--ink);text-decoration:none;display:block;padding:.65rem 0}
.site-nav a[aria-current="page"]{color:var(--rust);box-shadow:inset 0 -3px 0 var(--rust)}
.site-nav a:hover{color:var(--rust)}
@media (max-width:47.99rem){
  .js .site-nav{display:none;width:100%}
  .js .site-nav.open{display:block}
  .bar{flex-wrap:wrap}
  .site-nav ul{padding:.25rem 0 .75rem;border-top:1px solid var(--rule)}
  .site-nav li+li{border-top:1px solid var(--rule)}
}
@media (min-width:48rem){
  .nav-toggle{display:none}
  .site-nav ul{display:flex;gap:1.6rem}
  .site-nav a{padding:1.2rem 0}
}
.no-js .nav-toggle{display:none}

/* ---------- Hero ---------- */
.hero{background:var(--ink);color:var(--paper);position:relative;overflow:hidden;border-bottom:6px solid var(--rust)}
.hero::before{content:"";position:absolute;inset:0;opacity:.13;pointer-events:none;
  background-image:linear-gradient(var(--paper) 1px,transparent 1px),linear-gradient(90deg,var(--paper) 1px,transparent 1px);
  background-size:28px 28px}
.hero .wrap{position:relative;padding-top:3.5rem;padding-bottom:3.5rem}
.kicker{font-family:var(--mono);font-size:.78rem;letter-spacing:.12em;text-transform:uppercase;color:#f0b49c;margin:0 0 1rem}
.hero h1{font-size:clamp(2.2rem,6vw,3.9rem);line-height:1.05;margin:0 0 1.2rem;max-width:18ch;font-weight:700;letter-spacing:-.01em}
.hero p.lede{font-size:clamp(1.1rem,2.2vw,1.3rem);max-width:38rem;margin:0 0 1.8rem;color:#e6e0d3}
.btn{display:inline-block;font-family:var(--sans);font-weight:700;font-size:.95rem;text-decoration:none;padding:.8rem 1.15rem;border-radius:3px;border:2px solid currentColor}
.btn-primary{background:var(--rust);border-color:var(--rust);color:#fff}
.btn-primary:hover{background:#97380f;border-color:#97380f;color:#fff}
.btn-ghost{color:var(--paper)}
.btn-ghost:hover{color:#f0b49c}
.btn-row{display:flex;flex-wrap:wrap;gap:.75rem}
.hero-diagram{display:none}
@media (min-width:64rem){
  .hero .wrap{display:grid;grid-template-columns:1.3fr 1fr;gap:3rem;align-items:center}
  .hero-diagram{display:block}
}
.hero-diagram svg{width:100%;height:auto}

/* ---------- Sections ---------- */
.section{padding:3.25rem 0}
.section.alt{background:var(--paper-2);border-top:1px solid var(--rule);border-bottom:1px solid var(--rule)}
.section-head{display:flex;align-items:baseline;justify-content:space-between;gap:1rem;flex-wrap:wrap;margin-bottom:1.5rem;border-bottom:2px solid var(--ink);padding-bottom:.5rem}
.section-head h2{margin:0;font-size:clamp(1.5rem,3vw,2rem)}
.label{font-family:var(--mono);font-size:.75rem;letter-spacing:.1em;text-transform:uppercase;color:var(--rust)}
.cols{display:grid;gap:1.5rem}
@media (min-width:48rem){.cols-3{grid-template-columns:repeat(3,1fr)}.cols-2{grid-template-columns:repeat(2,1fr)}}
.cols h3{font-size:1.2rem;margin:.2rem 0 .4rem}
.cols p{margin:0;color:var(--ink-2)}

/* ---------- Guide cards ---------- */
.cards{display:grid;gap:1rem;list-style:none;margin:0;padding:0}
@media (min-width:40rem){.cards{grid-template-columns:repeat(2,1fr)}}
@media (min-width:64rem){.cards{grid-template-columns:repeat(3,1fr)}}
.card{background:var(--card);border:1px solid var(--rule);border-top:4px solid var(--ink);padding:1.25rem 1.25rem 1.4rem;display:flex;flex-direction:column;position:relative;transition:border-color .15s,transform .15s}
.card:hover{border-top-color:var(--rust);transform:translateY(-2px)}
.card .num{font-family:var(--mono);font-size:.75rem;color:var(--muted);letter-spacing:.08em}
.card h3{font-size:1.22rem;line-height:1.25;margin:.35rem 0 .5rem}
.card h3 a{color:var(--ink);text-decoration:none}
.card h3 a::after{content:"";position:absolute;inset:0}
.card p{margin:0 0 1rem;color:var(--ink-2);font-size:1rem}
.card .tags{margin-top:auto;display:flex;flex-wrap:wrap;gap:.4rem}
.tag{font-family:var(--mono);font-size:.7rem;text-transform:uppercase;letter-spacing:.06em;background:var(--chart);color:var(--sea);padding:.2rem .45rem;border-radius:2px}
.card.featured{border-top-color:var(--rust)}
@media (min-width:64rem){.card.featured{grid-column:span 2}}

/* ---------- Article ---------- */
.article-head{background:var(--paper-2);border-bottom:2px solid var(--ink)}
.article-head .wrap{padding-top:2.25rem;padding-bottom:2rem}
.crumbs{font-family:var(--sans);font-size:.85rem;margin:0 0 1rem;color:var(--muted)}
.crumbs a{color:var(--muted)}
.article-head h1{font-size:clamp(1.9rem,4.6vw,3rem);line-height:1.1;margin:0 0 .9rem;max-width:24ch}
.dek{font-size:clamp(1.08rem,2vw,1.25rem);color:var(--ink-2);max-width:var(--measure);margin:0 0 1.2rem}
.meta{font-family:var(--mono);font-size:.75rem;color:var(--muted);letter-spacing:.04em;display:flex;flex-wrap:wrap;gap:.4rem 1.25rem;margin:0}
.article-layout{display:grid;gap:2.5rem;padding:2.5rem 1.25rem 3.5rem}
@media (min-width:64rem){.article-layout{grid-template-columns:minmax(0,var(--measure)) 17rem;justify-content:space-between}}
.prose{max-width:var(--measure)}
.prose h2{font-size:1.55rem;line-height:1.2;margin:2.4rem 0 .7rem;padding-top:.9rem;border-top:1px solid var(--rule)}
.prose h2:first-child{margin-top:0;border-top:0;padding-top:0}
.prose h3{font-size:1.18rem;margin:1.7rem 0 .4rem}
.prose p,.prose ul,.prose ol{margin:0 0 1.05rem}
.prose li{margin:.3rem 0}
.prose strong{color:var(--ink)}
.toc{font-family:var(--sans);font-size:.9rem;position:sticky;top:1rem;align-self:start;background:var(--card);border:1px solid var(--rule);padding:1rem 1.1rem}
.toc h2{font-family:var(--mono);font-size:.72rem;text-transform:uppercase;letter-spacing:.1em;color:var(--rust);margin:0 0 .5rem}
.toc ol{margin:0;padding-left:1.1rem}
.toc li{margin:.35rem 0}
.toc a{color:var(--ink-2);text-decoration:none}
.toc a:hover{color:var(--rust);text-decoration:underline}
@media (max-width:63.99rem){.toc{position:static;order:-1}}

/* Callouts */
.box{border:1px solid var(--rule);background:var(--card);padding:1.1rem 1.2rem;margin:1.6rem 0;font-size:1rem}
.box > :last-child{margin-bottom:0}
.box-title{font-family:var(--mono);font-size:.74rem;letter-spacing:.1em;text-transform:uppercase;margin:0 0 .5rem;display:block}
.box.fit{border-left:5px solid var(--sea);background:#f1f6f3}
.box.fit .box-title{color:var(--sea)}
.box.safety{border-left:5px solid var(--rust);background:#fbf1ea}
.box.safety .box-title{color:var(--rust)}
.box.note{border-left:5px solid var(--ink)}
.checklist{list-style:none;padding-left:0}
.checklist li{padding-left:1.75rem;position:relative}
.checklist li::before{content:"";position:absolute;left:0;top:.38em;width:1rem;height:1rem;border:2px solid var(--sea);border-radius:2px;background:#fff}

/* Tables */
.table-wrap{overflow-x:auto;margin:1.2rem 0 1.4rem;border:1px solid var(--rule);background:var(--card)}
table{border-collapse:collapse;width:100%;font-family:var(--sans);font-size:.9rem;line-height:1.45}
th,td{text-align:left;vertical-align:top;padding:.6rem .75rem;border-bottom:1px solid var(--rule)}
thead th{background:var(--ink);color:var(--paper);font-weight:700;font-size:.8rem;letter-spacing:.03em}
tbody tr:last-child td{border-bottom:0}
caption{caption-side:bottom;text-align:left;font-size:.8rem;color:var(--muted);padding:.5rem .75rem;font-family:var(--sans)}
.formula{font-family:var(--mono);font-size:.92rem;background:var(--ink);color:var(--paper);padding:.9rem 1rem;border-radius:2px;overflow-x:auto;white-space:pre;margin:1rem 0 1.2rem}

.next-guides{border-top:2px solid var(--ink);padding-top:1.5rem;margin-top:2.5rem}
.next-guides h2{border:0;padding:0;margin:0 0 1rem;font-size:1.2rem}

/* ---------- Disclosure + footer ---------- */
.disclosure{font-family:var(--sans);font-size:.88rem;color:var(--ink-2);background:var(--card);border:1px dashed var(--rule);padding:.9rem 1rem;max-width:var(--measure)}
.site-footer{background:var(--ink);color:#d9d3c6;font-family:var(--sans);font-size:.9rem;padding:2.5rem 0 2rem;margin-top:0}
.site-footer a{color:#f0d3c3}
.site-footer a:hover{color:#fff}
.foot-grid{display:grid;gap:1.5rem}
@media (min-width:48rem){.foot-grid{grid-template-columns:1.4fr 1fr 1fr}}
.site-footer h2{font-family:var(--mono);font-size:.72rem;text-transform:uppercase;letter-spacing:.12em;color:#f0b49c;margin:0 0 .6rem}
.site-footer ul{list-style:none;margin:0;padding:0}
.site-footer li{margin:.3rem 0}
.foot-note{border-top:1px solid #3a4553;margin-top:2rem;padding-top:1rem;font-size:.8rem;color:#aeb5bd}
.foot-brand{font-weight:800;text-transform:uppercase;letter-spacing:.04em;color:#fff;margin:0 0 .4rem}

/* Page (about) */
.page-body{padding:2.5rem 1.25rem 3.5rem}

@media print{.site-header,.site-footer,.toc,.nav-toggle{display:none}body{background:#fff}}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}
.article-layout > *{min-width:0}
.prose{overflow-wrap:break-word}

/* ---------- v1.1: disclaimer notes, 404, mobile tap targets ---------- */
.safety-top{margin-top:0}
.planning-note{font-family:var(--sans);font-size:.85rem;color:var(--muted);border-left:3px solid var(--rule);padding-left:.75rem;margin:0 0 1.5rem}
.planning-note a{color:var(--muted)}
.foot-disclaimer{color:#d9d3c6}
.btn-outline{color:var(--ink)}
.btn-outline:hover{color:var(--rust)}
.article-head .btn-row{margin-top:1.2rem}
.notfound-head{font-size:1.3rem;margin:0 0 1rem}
/* Tap targets: menu button and footer links at least ~44px tall on touch screens */
.nav-toggle{min-height:44px;min-width:44px}
@media (max-width:47.99rem){
  .site-footer li{margin:0}
  .site-footer li a{display:inline-block;padding:.55rem 0}
  .crumbs a{display:inline-block;padding:.35rem 0}
}