/* Custosa Learn — shared styles for the content library (pillars, clusters,
   comparisons, glossary). Mirrors the v3 sub-page system from security.html and
   adds article components: breadcrumb, hub grid, table of contents, FAQ,
   key takeaways, related links. */
:root{--bone:#EAE6DD;--ink:#0F120E;--bone-tx:#ECE8E0;--bone-tx-2:#B4B1A6;--bone-tx-3:#7E7C72;
--ink-tx:#13130E;--ink-tx-2:#46453d;--ink-tx-3:#7E7C72;--wax:#AE3F2D;--wax-soft:#C96A54;--signal:#137A66;--signal-ink:#37C6A4;
--li:rgba(236,232,224,.12);--li2:rgba(236,232,224,.06);--lb:rgba(15,18,14,.14);--lb2:rgba(15,18,14,.08);
--fs:'Schibsted Grotesk',ui-sans-serif,system-ui,sans-serif;--fm:'Geist Mono',ui-monospace,Menlo,monospace;--maxw:1180px;--pad:42px}
@media(max-width:720px){:root{--pad:22px}}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;background:var(--bone);color:var(--ink-tx);font-family:var(--fs);-webkit-font-smoothing:antialiased;line-height:1.5}
a{color:inherit}.wrap{max-width:var(--maxw);margin:0 auto;padding:0 var(--pad)}
.seal{width:26px;height:26px;display:inline-block;vertical-align:middle}
/* nav */
.nav{position:sticky;top:0;z-index:120;background:rgba(13,16,11,.82);backdrop-filter:blur(14px) saturate(1.1);border-bottom:1px solid var(--li);color:var(--bone-tx)}
.nav-in{display:flex;align-items:center;justify-content:space-between;height:74px}
.brand{display:flex;align-items:center;gap:11px;font-weight:700;font-size:1.4rem;letter-spacing:-.03em;text-decoration:none;color:var(--bone-tx)}.brand .seal{width:30px;height:30px;flex:0 0 auto}
.nav-links{display:flex;gap:30px;align-items:center}.nav-links a{font-size:.93rem;color:var(--bone-tx);opacity:.66;text-decoration:none;position:relative;transition:opacity .2s}.nav-links a:hover{opacity:1}.nav-links a::after{content:"";position:absolute;left:0;bottom:-5px;width:0;height:1px;background:var(--wax);transition:width .3s cubic-bezier(.16,1,.3,1)}.nav-links a:hover::after{width:100%}
.nav-cta{display:flex;align-items:center;gap:24px}
.nav-cta .ghost{color:var(--bone-tx-2);text-decoration:none;font-size:.93rem;box-shadow:inset 0 -1px 0 transparent;padding-bottom:2px;transition:color .2s,box-shadow .2s}.nav-cta .ghost:hover{color:var(--bone-tx);box-shadow:inset 0 -1px 0 var(--li)}
.nav-cta .wax{color:var(--wax-soft);text-decoration:none;font-weight:600;font-size:.93rem;box-shadow:inset 0 -1.5px 0 rgba(201,106,84,.4);padding-bottom:2px;transition:box-shadow .2s}.nav-cta .wax::after{content:"→";margin-left:7px;display:inline-block;transition:transform .25s cubic-bezier(.16,1,.3,1)}.nav-cta .wax:hover{box-shadow:inset 0 -2px 0 var(--wax-soft)}.nav-cta .wax:hover::after{transform:translateX(4px)}
@media(max-width:760px){.nav-links{display:none}}
/* page header */
.lhead{background:var(--ink);color:var(--bone-tx);padding:60px 0 50px;border-bottom:1px solid var(--li)}
.lhead .eyebrow{font-family:var(--fm);font-size:.66rem;letter-spacing:.18em;text-transform:uppercase;color:var(--signal-ink)}
.lhead h1{font-size:clamp(2rem,4.4vw,3.1rem);font-weight:600;letter-spacing:-.028em;margin:14px 0 0;line-height:1.04;max-width:20ch}
.lhead .updated{font-family:var(--fm);font-size:.72rem;color:var(--bone-tx-3);margin-top:18px;letter-spacing:.02em}
.lhead .intro{color:var(--bone-tx-2);max-width:74ch;margin-top:18px;font-size:1.08rem;line-height:1.62}
/* breadcrumb */
.crumb{font-family:var(--fm);font-size:.7rem;letter-spacing:.04em;color:var(--bone-tx-3);margin-bottom:6px}
.crumb a{color:var(--bone-tx-3);text-decoration:none;border-bottom:1px solid transparent;transition:color .2s,border-color .2s}.crumb a:hover{color:var(--bone-tx-2);border-bottom-color:var(--li)}
.crumb span{opacity:.5;margin:0 8px}
/* body + article */
.lbody{padding:18px 0 90px}
.layout{display:grid;grid-template-columns:minmax(0,1fr) 230px;gap:54px;align-items:start}
@media(max-width:900px){.layout{grid-template-columns:1fr}.toc{display:none}}
.col{max-width:760px}
.sec{padding:30px 0;border-top:1px solid var(--lb)}.sec:first-child{border-top:0;padding-top:8px}
.sec h2{display:flex;gap:14px;align-items:baseline;font-size:1.5rem;font-weight:600;letter-spacing:-.018em;margin:0 0 14px;color:var(--ink-tx);scroll-margin-top:90px}
.sec h2 .sn{font-family:var(--fm);font-size:.72rem;color:var(--wax);letter-spacing:.06em;flex:0 0 auto;transform:translateY(-2px)}
.sec h3{font-size:1.08rem;font-weight:600;margin:24px 0 6px;color:var(--ink-tx)}
.sec p{color:var(--ink-tx-2);margin:0 0 14px;font-size:1.02rem;line-height:1.72;max-width:74ch}
.sec ul,.sec ol{margin:0 0 14px;padding-left:0;list-style:none;max-width:74ch}
.sec ol{counter-reset:li}
.sec li{position:relative;padding-left:24px;color:var(--ink-tx-2);margin-bottom:10px;line-height:1.66}
.sec li::before{content:"";position:absolute;left:4px;top:12px;width:6px;height:1px;background:var(--wax)}
.sec ol li{counter-increment:li}.sec ol li::before{content:counter(li);top:0;left:0;width:auto;height:auto;background:none;font-family:var(--fm);font-size:.72rem;color:var(--wax)}
.sec a{color:var(--wax);text-decoration:none;border-bottom:1px solid rgba(174,63,45,.35)}.sec a:hover{border-bottom-color:var(--wax)}
.sec strong{color:var(--ink-tx);font-weight:600}
.lead-p{font-size:1.12rem;line-height:1.66;color:var(--ink-tx);max-width:74ch}
.callout{font-family:var(--fm);font-size:.84rem;color:var(--ink-tx-2);background:rgba(15,18,14,.04);border-left:2px solid var(--wax);padding:14px 16px;border-radius:0 6px 6px 0;line-height:1.6;max-width:74ch;margin:4px 0 16px}
.pullquote{font-size:1.5rem;font-weight:600;letter-spacing:-.015em;line-height:1.28;color:var(--ink-tx);border-left:3px solid var(--wax);padding:6px 0 6px 22px;margin:22px 0;max-width:30ch}
.pullquote .hl{color:var(--wax)}
/* takeaways */
.takeaways{border:1px solid var(--lb);border-radius:12px;padding:22px 24px;margin:6px 0 8px;background:#fff}
.takeaways .tn{font-family:var(--fm);font-size:.62rem;letter-spacing:.12em;text-transform:uppercase;color:var(--wax);margin-bottom:12px}
.takeaways ul{margin:0;max-width:none}.takeaways li{padding-left:24px}
/* pills + tables (shared with sub-pages) */
.pill{font-family:var(--fm);font-size:.6rem;letter-spacing:.06em;text-transform:uppercase;padding:3px 9px;border-radius:20px;border:1px solid;display:inline-block;white-space:nowrap}
.pill.ok{color:var(--signal);border-color:rgba(19,122,102,.45);background:rgba(19,122,102,.08)}
.pill.prog{color:var(--wax);border-color:rgba(174,63,45,.45);background:rgba(174,63,45,.08)}
.pill.eval{color:var(--ink-tx-3);border-color:var(--lb)}
table.t{width:100%;border-collapse:collapse;margin:6px 0 16px;font-size:.96rem;max-width:74ch}
table.t th{text-align:left;font-family:var(--fm);font-size:.6rem;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-tx-3);padding:0 16px 10px 0;border-bottom:1px solid var(--lb);font-weight:500}
table.t td{padding:13px 16px 13px 0;border-bottom:1px solid var(--lb2);color:var(--ink-tx-2);vertical-align:top;line-height:1.55}
table.t td:first-child{color:var(--ink-tx);font-weight:500}
table.t .yes{color:var(--signal);font-weight:600}table.t .no{color:var(--ink-tx-3)}
/* cards / hub grid */
.dgrid{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:8px}
@media(max-width:680px){.dgrid{grid-template-columns:1fr}}
.dcard{border:1px solid var(--lb);border-radius:10px;padding:20px 22px}
.dcard .dn{font-family:var(--fm);font-size:.6rem;letter-spacing:.1em;text-transform:uppercase;color:var(--wax);margin-bottom:12px}
.dcard ul{margin:0;padding:0;list-style:none;max-width:none}
.dcard li{padding-left:0;color:var(--ink-tx-2);font-size:.92rem;margin-bottom:9px;line-height:1.4}
.dcard li::before{display:none}
.dcard li b{color:var(--ink-tx);font-weight:600;display:block;font-family:var(--fm);font-size:.82rem;letter-spacing:.01em}
/* hub: topic cards */
.hubgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:10px}
@media(max-width:820px){.hubgrid{grid-template-columns:1fr 1fr}}@media(max-width:540px){.hubgrid{grid-template-columns:1fr}}
.hubcard{display:block;border:1px solid var(--lb);border-radius:12px;padding:22px 22px 20px;text-decoration:none;background:#fff;transition:border-color .2s,transform .2s}
.hubcard:hover{border-color:rgba(174,63,45,.5);transform:translateY(-2px)}
.hubcard .hk{font-family:var(--fm);font-size:.58rem;letter-spacing:.12em;text-transform:uppercase;color:var(--wax);margin-bottom:11px}
.hubcard h3{font-size:1.08rem;font-weight:600;color:var(--ink-tx);margin:0 0 7px;letter-spacing:-.01em;line-height:1.25}
.hubcard p{color:var(--ink-tx-2);font-size:.92rem;line-height:1.5;margin:0}
.hubcard .more{display:inline-block;margin-top:13px;color:var(--wax-soft);font-size:.85rem;font-weight:600}
.hubcard:hover .more::after{content:" →"}
/* sticky TOC */
.toc{position:sticky;top:98px;font-size:.86rem}
.toc .tt{font-family:var(--fm);font-size:.58rem;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-tx-3);margin-bottom:12px}
.toc a{display:block;color:var(--ink-tx-3);text-decoration:none;padding:5px 0 5px 12px;border-left:1px solid var(--lb);line-height:1.4;transition:color .2s,border-color .2s}
.toc a:hover{color:var(--ink-tx);border-left-color:var(--wax)}
/* FAQ */
.faq details{border-top:1px solid var(--lb);padding:4px 0}
.faq details summary{cursor:pointer;list-style:none;padding:16px 0;font-weight:600;color:var(--ink-tx);font-size:1.04rem;display:flex;justify-content:space-between;gap:16px;align-items:center}
.faq details summary::-webkit-details-marker{display:none}
.faq details summary::after{content:"+";font-family:var(--fm);color:var(--wax);font-size:1.1rem;flex:0 0 auto;transition:transform .2s}
.faq details[open] summary::after{content:"−"}
.faq details p{color:var(--ink-tx-2);margin:0 0 16px;line-height:1.7;max-width:74ch}
/* related */
.related{margin-top:46px;border-top:1px solid var(--lb);padding-top:28px}
.related .rn{font-family:var(--fm);font-size:.62rem;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-tx-3);margin-bottom:16px}
.rlist{display:grid;grid-template-columns:1fr 1fr;gap:14px}@media(max-width:680px){.rlist{grid-template-columns:1fr}}
.rlist a{text-decoration:none;border:1px solid var(--lb);border-radius:9px;padding:15px 17px;transition:border-color .2s}
.rlist a:hover{border-color:rgba(174,63,45,.5)}
.rlist a b{display:block;color:var(--ink-tx);font-weight:600;font-size:.96rem;margin-bottom:3px}
.rlist a span{color:var(--ink-tx-3);font-size:.85rem;line-height:1.4}
/* inline CTA band */
.ctaband{margin:40px 0 0;border:1px solid var(--lb);border-radius:14px;padding:30px 32px;background:var(--ink);color:var(--bone-tx)}
.ctaband h3{font-size:1.4rem;font-weight:600;letter-spacing:-.018em;margin:0 0 8px;color:var(--bone-tx)}
.ctaband p{color:var(--bone-tx-2);margin:0 0 18px;max-width:60ch;line-height:1.6}
.ctaband .row{display:flex;gap:24px;align-items:center;flex-wrap:wrap}
.ctaband .wax{color:var(--wax-soft);text-decoration:none;font-weight:600;box-shadow:inset 0 -1.5px 0 rgba(201,106,84,.45);padding-bottom:2px}.ctaband .wax::after{content:" →"}
.ctaband .ghost{color:var(--bone-tx-2);text-decoration:none;box-shadow:inset 0 -1px 0 var(--li);padding-bottom:2px}
/* footer */
footer{background:var(--ink);color:var(--bone-tx-2);padding:64px 0 34px;border-top:1px solid var(--li)}
.fgrid{display:grid;grid-template-columns:1.6fr repeat(4,1fr);gap:34px;margin-bottom:46px}@media(max-width:820px){.fgrid{grid-template-columns:1fr 1fr;gap:30px}}
.fblurb{color:var(--bone-tx-3);font-size:.9rem;max-width:32ch;margin-top:16px}
.fcol h5{font-size:.62rem;letter-spacing:.14em;text-transform:uppercase;color:var(--bone-tx-3);margin:0 0 15px;font-family:var(--fm);font-weight:500}
.fcol a{display:block;color:var(--bone-tx-2);text-decoration:none;font-size:.9rem;margin-bottom:11px;transition:color .2s}.fcol a:hover{color:var(--wax-soft)}
.fbot{display:flex;justify-content:space-between;flex-wrap:wrap;gap:14px;border-top:1px solid var(--li);margin-top:0;padding-top:24px;font-family:var(--fm);font-size:.68rem;color:var(--bone-tx-3)}
.fbot a{color:var(--bone-tx-3);text-decoration:none}.fbot a:hover{color:var(--bone-tx-2)}