/* Shared styles: landing + about. The case study page keeps its own stylesheet with the same tokens. */
:root{
  color-scheme: dark;
  --ink:#0A0E14; --ivory:#F2EEE7;
  --d-tx:#EEF2F6; --d-tx2:#C3CBD5; --d-tx3:#949EAB; --d-line:#243041; --d-acc:#5AA9FF; --d-surf:#111925;
  --l-tx:#0E141B; --l-tx2:#2A323D; --l-tx3:#5A544D; --l-line:#D6CDBF; --l-acc:#0B57C2; --l-surf:#FBF9F5;
  --body:'Atkinson Hyperlegible Next','Atkinson Hyperlegible','Helvetica Neue',Arial,sans-serif;
  --display:'Michroma','Eurostile','Arial Black',sans-serif;
  --col:720px; --wide:1120px; --gut:clamp(20px,4vw,56px); --r:6px;
  --ease:cubic-bezier(.22,.7,.18,1);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:88px}
body{margin:0;background:var(--ink);color:var(--d-tx);font-family:var(--body);font-size:var(--fs-body);line-height:1.7;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;overflow-x:hidden}
a{color:inherit}
button{font:inherit;color:inherit}
img{max-width:100%;display:block}
h1,h2,h3,h4{margin:0;text-wrap:balance}
p{margin:0;text-wrap:pretty}
figure{margin:0}
::selection{background:var(--d-acc);color:var(--ink)}
:focus-visible{outline:2px solid var(--acc,var(--d-acc));outline-offset:4px}
.num{font-variant-numeric:tabular-nums}
.skip{position:absolute;left:var(--gut);top:-80px;z-index:100;background:var(--d-tx);color:var(--ink);padding:12px 16px;font-weight:700;text-decoration:none}
.skip:focus{top:12px}

/* themes: a section declares its palette, children read the tokens */
.dark{--bg:var(--ink);--tx:var(--d-tx);--tx2:var(--d-tx2);--tx3:var(--d-tx3);--line:var(--d-line);--acc:var(--d-acc);--surf:var(--d-surf);color:var(--tx)}
.light{--bg:var(--ivory);--tx:var(--l-tx);--tx2:var(--l-tx2);--tx3:var(--l-tx3);--line:var(--l-line);--acc:var(--l-acc);--surf:var(--l-surf);color:var(--tx);background:var(--bg)}
.light ::selection{background:var(--l-acc);color:#fff}

/* layout */
.col{max-width:calc(var(--col) + 2*var(--gut));margin-inline:auto;padding-inline:var(--gut)}
.wide{max-width:calc(var(--wide) + 2*var(--gut));margin-inline:auto;padding-inline:var(--gut)}
.stack{position:relative;z-index:1}

/* type */
.eyebrow{display:flex;align-items:center;gap:12px;font-size:var(--fs-sm);font-weight:700;line-height:1.3;color:var(--acc);margin-bottom:20px}
.eyebrow .n{font-family:var(--display);font-size:var(--fs-xs);letter-spacing:.06em;font-weight:400}
.eyebrow i{display:block;width:24px;height:1px;background:currentColor;opacity:.6}
.h2{font-size:var(--fs-2);line-height:1.14;font-weight:600;letter-spacing:-.018em;color:var(--tx)}
.h3{font-size:var(--fs-3);line-height:1.3;font-weight:600;letter-spacing:-.008em;color:var(--tx)}
.lead{font-size:var(--fs-4);line-height:1.6;color:var(--tx)}
.body{color:var(--tx2)}
/* section header: title, optional short note on the right */
.shead{display:flex;justify-content:space-between;align-items:baseline;gap:8px 24px;flex-wrap:wrap;margin-bottom:clamp(32px,3.5vw,48px)}
.shead h2{font-size:var(--fs-2);line-height:1.06;font-weight:600;letter-spacing:-.024em;color:var(--tx)}
.shead .sm{font-size:var(--fs-sm);line-height:1.4;color:var(--tx3)}
.k{font-size:var(--fs-sm);font-weight:700;line-height:1.3;color:var(--acc)}
.card{background:var(--surf);border:1px solid var(--line);border-radius:var(--r)}

/* links + buttons */
.go{display:inline-flex;align-items:baseline;gap:10px;font-weight:700;font-size:var(--fs-body);text-decoration:none;padding-block:10px;background-image:linear-gradient(currentColor,currentColor);background-size:100% 1px;background-position:0 calc(100% - 7px);background-repeat:no-repeat;transition:background-size .45s var(--ease)}
.go:hover{background-size:0% 1px;background-position:100% calc(100% - 7px)}
.go .ar{display:inline-block;transition:transform .35s var(--ease)}
.go:hover .ar{transform:translateX(5px)}
.go.up:hover .ar{transform:translate(3px,-3px)}
.btn{display:inline-flex;align-items:center;gap:10px;padding:12px 18px;border-radius:4px;border:1px solid var(--tx);font-weight:700;font-size:var(--fs-ui);line-height:1.2;text-decoration:none;background:none;cursor:pointer;transition:background .25s,color .25s,border-color .25s}
.btn:hover{background:var(--tx);color:var(--bg)}
.btn.solid{background:var(--acc);border-color:var(--acc);color:#fff}
.btn.solid:hover{background:var(--tx);border-color:var(--tx);color:var(--bg)}
/* the light blue used on dark sections needs dark text to stay legible (7:1 instead of 2.5:1) */
.dark .btn.solid{color:var(--ink)}
.draft{display:inline-block;font-size:var(--fs-sm);font-weight:700;line-height:1;padding:6px 8px;border:1px dashed var(--acc);color:var(--acc);border-radius:4px;vertical-align:middle}

/* nav */
.nav{position:fixed;inset:0 0 auto 0;z-index:50;color:var(--nav-tx,var(--d-tx));transition:background-color .4s var(--ease),color .3s}
.nav-in{display:flex;justify-content:space-between;align-items:center;gap:24px;max-width:1440px;margin:0 auto;padding-inline:var(--gut);padding-top:calc(env(safe-area-inset-top,0px) + 22px);padding-bottom:22px;transition:padding .4s var(--ease)}
.nav.solid{background:var(--nav-bg,rgba(10,14,20,.78));backdrop-filter:blur(14px) saturate(1.2);-webkit-backdrop-filter:blur(14px) saturate(1.2);box-shadow:0 1px 0 var(--nav-line,rgba(36,48,65,.9))}
.nav.solid .nav-in{padding-top:calc(env(safe-area-inset-top,0px) + 14px);padding-bottom:14px}
.brand{display:flex;align-items:center;gap:14px;text-decoration:none}
.brand svg{width:32px;height:28px}
.brand span{font-family:var(--display);font-size:13px;letter-spacing:.08em}
.nav ul{list-style:none;margin:0;padding:0;display:flex;gap:clamp(18px,2.6vw,40px)}
.nav ul a{position:relative;display:block;text-decoration:none;font-size:var(--fs-ui);font-weight:500;padding:8px 0}
.nav ul a::after{content:"";position:absolute;left:0;right:0;bottom:9px;height:1px;background:currentColor;transform:scaleX(0);transform-origin:right;transition:transform .4s var(--ease)}
.nav ul a:hover::after,.nav ul a[aria-current="page"]::after{transform:scaleX(1);transform-origin:left}
html[data-nav="light"]{--nav-tx:var(--l-tx);--nav-bg:rgba(242,238,231,.86);--nav-line:rgba(214,205,191,.9)}

/* sky bands: daylight fading to night before the footer, and back */
.dusk{height:clamp(220px,32vh,360px);background:linear-gradient(180deg,var(--ivory) 0%,#DCE3EA 22%,#9FB5D1 44%,#3F6597 64%,#15294A 82%,var(--ink) 100%)}

/* grain: a fine noise layer that keeps flat dark areas from looking digital */
.grain{position:relative;isolation:isolate}
.grain::after{content:"";position:absolute;inset:0;z-index:0;pointer-events:none;opacity:.5;background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='160' height='160'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 1  0 0 0 0 1  0 0 0 0 1  0 0 0 .07 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>")}
.grain > *{position:relative;z-index:1}

/* lightbox */
.lb{border:0;padding:0;margin:0;width:100vw;height:100vh;max-width:none;max-height:none;background:transparent;color:#EEF2F6}
.lb::backdrop{background:rgba(6,8,12,.94);backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px)}
.lb-in{width:100%;height:100%;overflow:auto;display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:40px;align-items:center;padding:72px clamp(20px,4vw,56px) 40px}
.lb img{max-width:100%;max-height:82vh;width:auto;height:auto;border-radius:4px;justify-self:center}
.lb .meta{display:flex;flex-direction:column;gap:14px}
.lb .meta h3{font-size:var(--fs-3);line-height:1.15;font-weight:600;letter-spacing:-.015em}
.lb .meta p{font-size:var(--fs-body);line-height:1.6;color:#C3CBD5}
.lb .meta dl{margin:8px 0 0;display:grid;gap:10px}
.lb .meta dt{font-size:var(--fs-sm);font-weight:700;color:#949EAB}
.lb .meta dd{margin:2px 0 0;font-size:var(--fs-ui);color:#EEF2F6}
.lb-x{position:fixed;top:16px;right:16px;width:48px;height:48px;border-radius:var(--r);border:1px solid rgba(238,242,246,.3);background:rgba(10,14,20,.7);color:#EEF2F6;cursor:pointer;display:grid;place-items:center}
.lb-x svg{width:20px;height:20px}

/* reveal */
.pre{opacity:0;transform:translateY(28px)}
.go-in{transition:opacity 1s var(--ease),transform 1s var(--ease)}
@keyframes rise{from{opacity:0;translate:0 18px}to{opacity:1;translate:0 0}}

@media (max-width: 900px){
  .lb-in{grid-template-columns:1fr;align-content:start}
}
@media (max-width: 560px){
  .brand span{display:none}
  .nav ul{gap:18px}
  .nav ul a{font-size:var(--fs-ui)}
}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition:none !important;animation:none !important}
  .pre{opacity:1;transform:none}
}