/* ────────────────────────────────────────────────────────────────
   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} }

/* ── the catalogue ──────────────────────────────────────────────────
   Two collections on one page, so the eye needs to be able to skip: the
   case studies stay as cards because each carries a number worth seeing,
   and the articles run as dense two-column rules because 209 of anything
   is a list, not a gallery. */
.lib-stats{display:flex;flex-wrap:wrap;gap:clamp(24px,4vw,56px);
  margin-top:clamp(28px,3.5vw,40px);padding-top:22px;border-top:1px solid var(--line)}
.lib-stats b{font-family:var(--f-display);font-weight:400;
  font-size:clamp(1.6rem,3vw,2.4rem);line-height:1;display:block;color:var(--ink)}
.lib-stats span{font-family:var(--f-util);font-size:.68rem;letter-spacing:.14em;
  text-transform:uppercase;color:var(--muted-2)}

.cs-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(16px,2vw,26px)}
@media (max-width:900px){ .cs-grid{grid-template-columns:1fr 1fr} }
@media (max-width:560px){ .cs-grid{grid-template-columns:1fr} }
.cs-card{
  display:grid;gap:8px;align-content:start;text-decoration:none;
  background:var(--paper);border:1px solid var(--line);border-radius:4px;
  padding:clamp(18px,2vw,24px);
  transition:border-color .25s ease, transform .35s cubic-bezier(.2,.7,.3,1), box-shadow .35s ease;
}
.cs-card:hover{border-color:#E2B266;transform:translateY(-3px);
  box-shadow:0 18px 36px -24px rgba(6,36,60,.35)}
.cs-fig{display:grid;gap:3px;margin-bottom:6px}
.cs-fig b{font-family:var(--f-display);font-weight:400;
  font-size:clamp(1.6rem,2.6vw,2.2rem);line-height:1;color:#8A5F16;
  letter-spacing:-0.02em;font-variant-numeric:tabular-nums}
.cs-fig.word b{font-size:clamp(1.1rem,1.6vw,1.4rem);padding-top:.3em}
.cs-fig span{font-family:var(--f-util);font-size:.66rem;letter-spacing:.14em;
  text-transform:uppercase;color:var(--muted-2)}
.cs-card h3{font-size:1.2rem}
.cs-card p{font-size:.94rem;color:var(--muted);line-height:1.55}

.chips{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:clamp(26px,3vw,40px)}
.chip{font-family:var(--f-util);font-size:.76rem;letter-spacing:.06em;
  border:1px solid var(--line);border-radius:999px;color:var(--muted);
  padding:.5em 1em;text-decoration:none;
  transition:border-color .2s ease,color .2s ease}
.chip:hover{border-color:#E2B266;color:#8A5F16}
.chip b{font-weight:500;color:#8A5F16;margin-left:.35em}

.cat{padding-block:clamp(22px,3vw,34px);border-top:1px solid var(--line);
  scroll-margin-top:calc(var(--barh, 76px) + 20px)}
.cat-head{display:flex;align-items:baseline;gap:14px;margin-bottom:14px}
.cat-head h3{font-size:clamp(1.3rem,2vw,1.7rem)}
.count{font-family:var(--f-util);font-size:.72rem;letter-spacing:.14em;color:var(--muted-2)}
.cat ul{list-style:none;margin:0;padding:0;display:grid;
  grid-template-columns:1fr 1fr;gap:0 clamp(24px,3vw,44px)}
@media (max-width:760px){ .cat ul{grid-template-columns:1fr} }
.cat li a{display:flex;justify-content:space-between;gap:16px;align-items:baseline;
  padding:11px 0;border-bottom:1px solid var(--line-2);text-decoration:none;
  color:var(--ink);transition:color .2s ease}
.cat li a:hover{color:#8A5F16}
.cat .t{font-size:.98rem;line-height:1.4}
.cat .m{font-family:var(--f-util);font-size:.66rem;letter-spacing:.1em;
  text-transform:uppercase;color:var(--muted-2);white-space:nowrap;flex:none}

/* the note that explains why these open in their own tab */
.lib-note{
  margin-top:clamp(20px,2.4vw,30px);padding:clamp(16px,2vw,22px);
  border:1px solid var(--line);border-left:2px solid #E2B266;border-radius:3px;
  background:var(--paper-2);max-width:var(--measure);
  font-size:.95rem;line-height:1.6;color:var(--muted);
}