/* ────────────────────────────────────────────────────────────────
   Castle Light - the shared chrome.
   Castle navy on white paper, Castle blue as the single accent,
   Fraunces / Hanken / Jost. These pages mock up live castle.co.uk
   pages, so they commit to the light world and paint every colour
   explicitly rather than inheriting a host theme.
   ──────────────────────────────────────────────────────────────── */
:root{
  color-scheme:light;

  --paper:      #FFFFFF;
  --paper-2:    #F2F5F8;
  --ink:        #06243C;   /* Castle navy */
  --ink-2:      #0B3453;
  --muted:      #5C7488;
  --muted-2:    #93A5B4;
  --line:       #DEE6ED;
  --line-2:     #EDF1F5;
  --accent:     #1C70EE;   /* Castle blue */
  --accent-dk:  #0F55C4;
  --night:      #050506;
  --night-ink:  #F4F7FA;
  --night-mute: #97A3AD;

  --f-display: "Fraunces", "Juana", Georgia, serif;
  --f-body:    "Hanken Grotesk", "Avenir", "Segoe UI", system-ui, sans-serif;
  --f-util:    "Jost", "Avenir", system-ui, sans-serif;

  --gutter: clamp(20px, 5vw, 64px);
  --maxw: 1180px;
  --measure: 68ch;
  --barh: 72px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth;overflow-x:clip;background:var(--paper)}
body{
  margin:0;background:var(--paper);color:var(--ink);
  font-family:var(--f-body);font-weight:300;font-size:17px;line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
@media (prefers-reduced-motion: reduce){ html{scroll-behavior:auto} }

.wrap{max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gutter)}
img{max-width:100%;display:block}

h1,h2,h3{font-family:var(--f-display);font-weight:300;text-wrap:balance;margin:0;letter-spacing:-0.015em;color:var(--ink)}
h1{font-size:clamp(2.3rem,6vw,4.6rem);line-height:1.04}
h2{font-size:clamp(1.7rem,3vw,2.4rem);line-height:1.12}
h3{font-size:clamp(1.05rem,1.5vw,1.25rem);line-height:1.3}
p{margin:0}
a{color:inherit}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px}

.eyebrow{
  font-family:var(--f-util);font-size:.72rem;font-weight:500;
  letter-spacing:.22em;text-transform:uppercase;color:var(--muted-2);margin:0;
}
.lede{font-size:clamp(1.05rem,1.6vw,1.3rem);color:var(--muted)}

.btn{
  display:inline-flex;align-items:center;gap:.6em;
  font-family:var(--f-util);font-size:.84rem;font-weight:500;letter-spacing:.1em;text-transform:uppercase;
  padding:1em 1.9em;border:1px solid transparent;border-radius:2px;
  text-decoration:none;cursor:pointer;background:none;color:var(--ink);
  transition:background .25s ease, border-color .25s ease, color .25s ease;
}
.btn-primary{background:var(--accent);border-color:var(--accent);color:#fff}
.btn-primary:hover{background:var(--accent-dk);border-color:var(--accent-dk)}
.btn-ghost{border-color:var(--line);color:var(--ink)}
.btn-ghost:hover{border-color:var(--ink)}
.btn-light{border-color:rgba(244,247,250,.32);color:var(--night-ink)}
.btn-light:hover{border-color:var(--night-ink);background:rgba(244,247,250,.08)}

/* ── header ─────────────────────────────────────────────────── */
header{position:fixed;top:0;left:0;right:0;z-index:60;background:var(--paper);border-bottom:1px solid var(--line)}
.bar{display:flex;align-items:center;justify-content:space-between;gap:24px;padding-block:16px}
.logo{display:block;height:100%;width:100%}
.mark{display:block;text-decoration:none;color:var(--ink);width:clamp(100px,10.5vw,128px);aspect-ratio:69.94/12.45}
nav ul{display:flex;gap:28px;list-style:none;margin:0;padding:0}
nav a{font-family:var(--f-util);font-size:.82rem;letter-spacing:.06em;text-decoration:none;color:var(--muted);transition:color .2s ease}
nav a:hover{color:var(--ink)}
nav a[aria-current="page"]{color:var(--ink)}
nav a[aria-current="page"]::after{content:"";display:block;height:1px;background:var(--accent);margin-top:5px}
.bar .btn{padding:.72em 1.3em;font-size:.74rem}
/* the site shell adds the hamburger below this width */
@media (max-width:900px){ .bar nav{display:none} }

/* ── masthead ───────────────────────────────────────────────── */
.masthead{padding-top:calc(var(--barh) + clamp(44px,6.5vw,88px));padding-bottom:clamp(30px,3.6vw,46px)}
.masthead .inner{display:grid;gap:clamp(16px,2vw,24px)}
.masthead h1{max-width:20ch}
.masthead .lede{max-width:58ch}
.crumb{
  font-family:var(--f-util);font-size:.72rem;letter-spacing:.16em;text-transform:uppercase;
  color:var(--muted-2);text-decoration:none;display:inline-flex;gap:.6em;align-items:center;
  transition:color .2s ease;margin-bottom:22px;
}
.crumb:hover{color:var(--accent)}
.tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:2px}
.tag{
  font-family:var(--f-util);font-size:.72rem;letter-spacing:.06em;
  border:1px solid var(--line);border-radius:999px;color:var(--muted);padding:.42em .95em;
}

.keyfigs{
  display:grid;grid-template-columns:repeat(4,1fr);gap:clamp(16px,2.5vw,34px);
  margin-top:clamp(30px,3.5vw,44px);padding-top:24px;border-top:1px solid var(--line);
}
.kf{display:grid;gap:3px}
.kf b{
  font-family:var(--f-display);font-weight:400;font-size:clamp(1.55rem,3vw,2.5rem);
  line-height:1;color:var(--ink);letter-spacing:-0.02em;font-variant-numeric:tabular-nums;
}
.kf span{font-family:var(--f-util);font-size:.68rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted-2);line-height:1.5}
@media (max-width:760px){ .keyfigs{grid-template-columns:1fr 1fr;gap:22px} }

/* ── bands ──────────────────────────────────────────────────── */
.band{padding-block:clamp(46px,6.2vw,84px)}
.band.tint{background:var(--paper-2);border-block:1px solid var(--line)}
.head{display:grid;gap:11px;max-width:60ch;margin-bottom:clamp(26px,3.2vw,42px)}
.head .eyebrow{color:var(--accent)}
.prose{display:grid;gap:1.05em;max-width:var(--measure)}
.prose p{color:var(--ink-2);font-size:1.04rem}
.prose ul{margin:0;padding-left:1.15em;display:grid;gap:.5em;color:var(--ink-2)}

/* ── close band ─────────────────────────────────────────────── */
.close{background:var(--night);color:var(--night-ink)}
.close-in{display:grid;grid-template-columns:1.2fr auto;gap:clamp(24px,4vw,60px);align-items:center;padding-block:clamp(52px,7vw,92px)}
.close h2{color:#fff;max-width:26ch;margin-top:14px}
.close p{color:var(--night-mute);margin-top:16px;max-width:48ch}
.close .eyebrow{color:rgba(244,247,250,.5)}
@media (max-width:760px){ .close-in{grid-template-columns:1fr} }

/* ── footer ─────────────────────────────────────────────────── */
footer{background:var(--night);color:var(--night-mute);border-top:1px solid #14181C}
footer .wrap{padding-block:clamp(44px,5vw,68px) 30px}
/* brand block plus four link columns, the last of which is Legal */
.fgrid{display:grid;grid-template-columns:1.25fr repeat(4,1fr);gap:clamp(22px,2.6vw,38px)}
@media (max-width:1040px){ .fgrid{grid-template-columns:1fr 1fr 1fr} }
footer .mark{color:var(--night-ink)}
footer h4{font-family:var(--f-util);font-size:.7rem;font-weight:500;letter-spacing:.2em;text-transform:uppercase;color:var(--night-ink);margin:0 0 14px}
footer ul{list-style:none;margin:0;padding:0;display:grid;gap:9px}
footer a{color:var(--night-mute);text-decoration:none;font-size:.92rem;transition:color .2s ease}
footer a:hover{color:var(--night-ink)}
.fnote{font-size:.92rem;display:grid;gap:6px;margin-top:18px}
/* the social row - present on every footer */
.socials{display:flex;gap:10px;margin-top:20px}
.socials a{
  width:38px;height:38px;border:1px solid #1B2027;border-radius:999px;
  display:grid;place-items:center;color:var(--night-mute);
  transition:color .2s ease, border-color .2s ease, background .2s ease;
}
.socials a:hover{color:#fff;border-color:var(--night-mute);background:#12161B}
.socials svg{width:16px;height:16px;display:block;fill:currentColor}
.legal{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px 26px;margin-top:clamp(34px,4vw,52px);
  padding-top:22px;border-top:1px solid #16191D;
  font-family:var(--f-util);font-size:.7rem;letter-spacing:.12em;text-transform:uppercase;color:#6C7A85;
}
/* the four policies: one canonical group, pushed to the end of the strip on
   wide screens and wrapping underneath on narrow ones */
.legal-links{display:flex;flex-wrap:wrap;gap:8px 20px;margin-left:auto}
.legal-links a{color:#6C7A85;text-decoration:none;transition:color .2s ease}
.legal-links a:hover{color:var(--night-ink)}
/* on a phone the strip stacks, and the links get enough vertical padding to
   be a real tap target rather than a 24px sliver */
@media (max-width:760px){
  .legal-links{margin-left:0;gap:0 18px}
  .legal-links a{padding-block:9px}
}
@media (max-width:760px){ .fgrid{grid-template-columns:1fr 1fr} }

/* ── one motion device, shared across the site ──────────────── */
.rise{opacity:0;transform:translateY(18px);transition:opacity .7s cubic-bezier(.2,.7,.3,1), transform .7s cubic-bezier(.2,.7,.3,1)}
.rise.in{opacity:1;transform:none}
@media (prefers-reduced-motion: reduce){ .rise{opacity:1;transform:none;transition:none} }

/* ════════════════════════════════════════════════════════════════
   ARTICLE - what long-form needs on top of the framework
   ════════════════════════════════════════════════════════════════ */
.crumbs{
  padding-top:calc(var(--barh) + clamp(26px,3.5vw,44px));
  font-family:var(--f-util);font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;
  color:var(--muted-2);display:flex;gap:.6em;flex-wrap:wrap;
}
.crumbs a{font-family:inherit;font-size:inherit;letter-spacing:inherit;text-decoration:none;color:var(--muted-2);transition:color .2s ease}
.crumbs a:hover{color:var(--accent)}
.crumbs span[aria-current]{color:var(--ink)}

.head{padding-top:clamp(22px,3vw,34px);padding-bottom:clamp(28px,3.5vw,44px)}
.head .inner{display:grid;gap:clamp(16px,2vw,24px)}
.head h1{max-width:none;font-size:clamp(2.1rem,5vw,4rem)}
.head .standfirst{font-family:var(--f-body);font-weight:300;font-size:clamp(1.08rem,1.7vw,1.38rem);line-height:1.55;color:var(--muted);max-width:none}
.byline{
  display:flex;flex-wrap:wrap;gap:10px 26px;align-items:baseline;
  margin-top:clamp(18px,2.4vw,28px);padding-top:20px;border-top:1px solid var(--line);
  font-family:var(--f-util);font-size:.74rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted-2);
}
.byline b{color:var(--ink);font-weight:500;font-variant-numeric:tabular-nums}

.hero{margin-bottom:clamp(36px,5vw,64px);display:grid;place-items:center;background:var(--paper-2);border-radius:4px;overflow:hidden;
  box-shadow:0 1px 2px rgba(6,36,60,.06), 0 20px 44px -24px rgba(6,36,60,.3)}
.hero img{width:auto;height:auto;max-width:100%;max-height:clamp(260px,52svh,560px);display:block}

.article{display:grid;grid-template-columns:232px minmax(0,1fr);gap:clamp(32px,5vw,76px);padding-bottom:clamp(56px,7vw,96px)}
.article.solo{grid-template-columns:minmax(0,1fr);justify-items:center}
.article.solo .toc,.article.solo .toc-m{display:none}
@media (max-width:960px){ .article{grid-template-columns:minmax(0,1fr)} }

.toc{position:sticky;top:calc(var(--barh) + 28px);align-self:start;max-height:calc(100vh - var(--barh) - 60px);overflow-y:auto}
.toc h2{font-family:var(--f-util);font-size:.68rem;font-weight:500;letter-spacing:.2em;text-transform:uppercase;color:var(--muted-2);margin:0 0 14px}
.toc ol{list-style:none;margin:0;padding:0;display:grid;gap:2px}
.toc a{display:block;text-decoration:none;line-height:1.4;color:var(--muted);font-family:var(--f-body);font-size:.86rem;letter-spacing:0;
  padding:7px 0 7px 14px;border-left:1px solid var(--line);transition:color .2s ease, border-color .2s ease}
.toc a:hover{color:var(--ink);border-color:var(--muted-2)}
.toc a[aria-current="true"]{color:var(--accent);border-color:var(--accent)}
.toc-m{display:none}
@media (max-width:960px){
  .toc{display:none}
  .toc-m{display:block;margin-bottom:clamp(28px,4vw,40px);border-block:1px solid var(--line)}
  .toc-m summary{cursor:pointer;padding:16px 0;list-style:none;font-family:var(--f-util);font-size:.74rem;letter-spacing:.16em;text-transform:uppercase;color:var(--ink);
    display:flex;justify-content:space-between;align-items:center;gap:12px}
  .toc-m summary::-webkit-details-marker{display:none}
  .toc-m summary::after{content:"+";color:var(--accent);font-size:1.1rem;line-height:1}
  .toc-m[open] summary::after{content:"\2212"}
  .toc-m ol{list-style:none;margin:0;padding:0 0 18px;display:grid;gap:9px}
  .toc-m a{text-decoration:none;color:var(--muted);font-size:.94rem}
}

.prose{max-width:68ch;font-size:1.06rem;line-height:1.78;min-width:0}
.prose > * + *{margin-top:1.15em}
.prose h2{font-size:clamp(1.5rem,2.3vw,2rem);line-height:1.16;margin-top:2.1em;padding-top:.9em;border-top:1px solid var(--line);scroll-margin-top:calc(var(--barh) + 28px)}
.prose > h2:first-child{margin-top:0;padding-top:0;border-top:0}
.prose h3{font-size:clamp(1.12rem,1.5vw,1.3rem);margin-top:1.7em;color:var(--ink-2);scroll-margin-top:calc(var(--barh) + 28px)}
.prose h4{font-family:var(--f-body);font-weight:600;font-size:1.02rem;margin-top:1.5em;color:var(--ink)}
.prose p{color:var(--ink)}
.prose strong{font-weight:600}
.prose a{color:var(--accent);text-decoration:none;border-bottom:1px solid rgba(28,112,238,.32);transition:border-color .2s ease;overflow-wrap:anywhere}
.prose a:hover{border-color:var(--accent)}
.prose ul,.prose ol{padding-left:1.15em;display:grid;gap:.6em}
.prose li{padding-left:.2em}
.prose li::marker{color:var(--muted-2)}
.prose figure{margin:2.2em 0;display:grid;gap:10px;justify-items:center}
.prose figure img{width:auto;height:auto;max-width:100%;max-height:clamp(320px,64svh,680px);border-radius:4px;border:1px solid var(--line-2)}
.prose figcaption{font-family:var(--f-util);font-size:.72rem;line-height:1.5;letter-spacing:.04em;color:var(--muted-2);text-align:center;max-width:64ch}
.prose blockquote{margin:1.6em 0;padding:.3em 0 .3em 1.3em;border-left:2px solid var(--accent);color:var(--muted);font-size:1.02rem}
.prose blockquote p + p{margin-top:.6em}
.prose blockquote.tweet{background:var(--paper-2);border:1px solid var(--line);border-left:2px solid var(--accent);border-radius:4px;padding:1.1em 1.3em}
.prose blockquote.tweet a{border-bottom:0}
.prose hr{border:0;border-top:1px solid var(--line);margin:2.4em 0}
.prose img{max-width:100%}
.prose iframe{display:none}
.prose sup{font-size:.7em}
.prose .video{position:relative;display:block;text-decoration:none;border:0;border-radius:4px;overflow:hidden;background:var(--night);width:100%}
.prose .video img{width:100%;height:auto;border:0;border-radius:0;max-height:none;display:block;opacity:.9}
.prose .video span{position:absolute;left:0;right:0;bottom:0;padding:14px 18px;background:linear-gradient(0deg,rgba(0,0,0,.72),rgba(0,0,0,0));
  color:#fff;font-family:var(--f-util);font-size:.74rem;letter-spacing:.14em;text-transform:uppercase}
.prose .embed{display:block;padding:18px 22px;border:1px solid var(--line);border-radius:4px;background:var(--paper-2);
  font-family:var(--f-util);font-size:.8rem;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);text-decoration:none}
.prose .embed:hover{color:var(--accent)}

.tablewrap{overflow-x:auto;margin:1.8em 0;border:1px solid var(--line);border-radius:4px}
.prose table{border-collapse:collapse;width:100%;min-width:520px;font-size:.94rem;margin:0}
.prose td,.prose th{border-bottom:1px solid var(--line-2);padding:14px 16px;vertical-align:top;color:var(--muted);text-align:left}
.prose th,.prose tr:first-child td{background:var(--paper-2);color:var(--ink);font-family:var(--f-util);font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;font-weight:500}
.prose tr:last-child td{border-bottom:0}
.prose td strong{color:var(--ink)}

.inline-cta{display:grid;gap:20px;align-items:center;grid-template-columns:1fr auto;background:var(--ink);color:#fff;border-radius:4px;
  padding:clamp(26px,3vw,38px) clamp(24px,3vw,40px);margin:2.6em 0}
.inline-cta h3{color:#fff;font-size:clamp(1.2rem,1.8vw,1.55rem);max-width:24ch;margin:0}
.inline-cta p{color:rgba(244,247,250,.66);font-size:.96rem;margin-top:8px;max-width:44ch}
@media (max-width:640px){ .inline-cta{grid-template-columns:1fr} }

.next{background:var(--paper-2);border-top:1px solid var(--line)}
.next-in{padding-block:clamp(48px,6vw,80px)}
.next-head{display:flex;justify-content:space-between;align-items:baseline;gap:20px;flex-wrap:wrap;margin-bottom:clamp(24px,3vw,36px)}
.next-head .all{font-family:var(--f-util);font-size:.76rem;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);text-decoration:none}
.notes{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(24px,3vw,44px)}
@media (max-width:900px){ .notes{grid-template-columns:repeat(2,1fr)} }
@media (max-width:600px){ .notes{grid-template-columns:1fr} }
.note{display:grid;gap:0;text-decoration:none;align-content:start;background:var(--paper);border-radius:4px;overflow:hidden;
  box-shadow:0 1px 2px rgba(6,36,60,.06),0 10px 26px -16px rgba(6,36,60,.24);transition:box-shadow .45s ease, transform .45s cubic-bezier(.2,.7,.3,1)}
.note:hover{transform:translateY(-4px);box-shadow:0 2px 4px rgba(6,36,60,.07),0 24px 46px -20px rgba(6,36,60,.32)}
.note-shot{position:relative;display:block;aspect-ratio:16/10;overflow:hidden;background:var(--paper-2);border-bottom:1px solid var(--line)}
.note-shot img{width:100%;height:100%;object-fit:cover}
.note .meta{display:block;padding:clamp(15px,1.5vw,19px) clamp(16px,1.6vw,21px) 0;font-family:var(--f-util);font-size:.7rem;letter-spacing:.16em;text-transform:uppercase;color:var(--muted-2)}
.note h3{font-size:1.18rem;transition:color .3s ease;padding:7px clamp(16px,1.6vw,21px) 0}
.note:hover h3{color:var(--accent)}
.note-foot{display:block;padding:11px clamp(16px,1.6vw,21px) clamp(18px,1.8vw,22px);font-family:var(--f-util);font-size:.68rem;letter-spacing:.1em;color:var(--muted-2)}
@media (prefers-reduced-motion: reduce){ .note,.note:hover{transform:none;transition:none} }