/* Case study pages. Built on styles.css tokens (paper, ink, accent, ring, lift).
   Layout: sticky section nav on the left, 720px reading column, wide figures break out to 1040px. */

.cs{max-width:720px;margin:0 auto;padding:56px 0 72px}
/* back to the index, top left, lined up with the section list */
/* labels share the wordmark's edge (the .wrap content edge); the arrow and the active dot hang 18px to its left */
:root{--cs-edge:max(28px, calc((100vw - 1160px) / 2 + 28px))}
.cs-back{
  position:fixed;left:calc(var(--cs-edge) - 18px);top:calc(var(--nav-h) + 53px);   /* lines its middle up with the eyebrow, the first line of the article */z-index:5;
  font-size:16px;
}
.cs-back .b{display:inline-flex;align-items:center;gap:4.5px;color:var(--muted);transition:color 150ms ease}
/* arrow sits in the line: box pulled left so the glyph starts on the dot column; stroke kept at ~1.3px; 1.5px above centre because the letters sit high in their line box */
.cs-back .b svg{width:17px;height:17px;margin:-3px 0 0 -3.5px;flex:none;stroke-width:1.85;transition:transform 200ms var(--ease-out)}
@media (hover:hover) and (pointer:fine){
  .cs-back .b:hover{color:var(--ink)}
  .cs-back .b:hover svg{transform:translateX(-3px)}
}
.cs-nav{position:fixed;left:calc(var(--cs-edge) - 18px);top:50%;transform:translateY(-50%);z-index:5;padding-left:18px}
.cs-nav ol{list-style:none;display:flex;flex-direction:column;gap:6px}
.cs-nav a{position:relative;display:block;padding:4px 0;font-size:16px;line-height:1.4;color:var(--faint);transition:color 200ms ease}
.cs-nav a::before{content:'';position:absolute;left:-18px;top:50%;width:6px;height:6px;margin-top:-3px;border-radius:50%;background:var(--accent);opacity:0;transform:scale(.4);transition:opacity 200ms ease, transform 240ms var(--ease-out)}
.cs-nav a:hover{color:var(--ink)}
.cs-nav a.on{color:var(--accent)}
.cs-nav a.on::before{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.cs-nav a::before{transition:none}}

.cs-body{min-width:0;max-width:720px}
.cs-body > section{scroll-margin-top:calc(var(--nav-h) + 32px);margin-bottom:96px}

/* type */
.eyebrow{font-family:system-ui,sans-serif;font-size:12px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--accent)}
.cs h1{margin-top:14px;font-size:clamp(32px,3.4vw,44px);font-weight:400;line-height:1.12;letter-spacing:-.01em}
.cs h2{margin-top:10px;font-size:clamp(25px,2.2vw,30px);font-weight:400;line-height:1.2;letter-spacing:-.01em}
.cs h3{font-size:19px;font-weight:500;line-height:1.3;letter-spacing:-.005em}
.cs p{margin-top:14px}
.cs .lead{margin-top:16px;font-size:19px;color:var(--muted);line-height:1.55}
.cs .muted{color:var(--muted)}
.cs b{font-weight:600}
.small{font-family:system-ui,sans-serif;font-size:13px;line-height:1.5;color:var(--muted)}

/* meta strip + tl;dr */
.meta-grid{margin-top:36px;display:grid;grid-template-columns:repeat(4,1fr);border-radius:14px;background:var(--cell);box-shadow:var(--ring)}
.meta-grid div{padding:16px 18px}
.meta-grid div + div{box-shadow:inset 1px 0 0 var(--line)}
.meta-grid dt{font-family:system-ui,sans-serif;font-size:11px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--faint)}
.meta-grid dd{margin-top:4px;font-size:15.5px;line-height:1.4}

.tldr{margin-top:28px;display:grid;grid-template-columns:1fr 1fr;box-shadow:inset 0 1px 0 var(--line)}
.tldr div{padding:20px 22px 22px 0;box-shadow:inset 0 -1px 0 var(--line)}
.tldr div:nth-child(even){padding-left:22px;box-shadow:inset 0 -1px 0 var(--line), inset 1px 0 0 var(--line)}
.tldr dt{font-family:system-ui,sans-serif;font-size:11px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--accent)}
.tldr dd{margin-top:6px;font-size:16px;line-height:1.5}

/* figures */
figure{margin-top:28px}
.wide{width:100%;margin-left:0}
.shot{display:block;border-radius:14px;overflow:hidden;background:var(--card);box-shadow:var(--ring), var(--lift);cursor:zoom-in;position:relative}
.shot img{width:100%;height:auto;transition:transform var(--spring-ms) var(--spring)}
@media (hover:hover){.shot:hover img{transform:scale(1.008)}}
figcaption{margin-top:12px;font-family:system-ui,sans-serif;font-size:13.5px;line-height:1.5;color:var(--muted);max-width:68ch}
figcaption b{color:var(--ink);font-weight:600}

/* crop: show one region of a screen, large enough to read */
.crop{aspect-ratio:var(--ar,16/9);overflow:hidden}
.crop img{width:var(--s,180%);max-width:none;height:auto;transform:translate(var(--x,0),var(--y,0))}
@media (hover:hover){.shot.crop:hover img{transform:translate(var(--x,0),var(--y,0))}}

/* who you'll meet */

/* number cards */
.nums{margin-top:26px;display:grid;grid-template-columns:repeat(4,1fr);box-shadow:inset 0 1px 0 var(--line), inset 0 -1px 0 var(--line)}
.nums div{padding:20px 16px 18px 0}
.nums div + div{padding-left:16px;box-shadow:inset 1px 0 0 var(--line)}
.nums b{display:block;font-size:34px;font-weight:400;letter-spacing:-.02em;line-height:1.1}
.nums span{display:block;margin-top:6px;font-family:system-ui,sans-serif;font-size:12.5px;line-height:1.4;color:var(--muted)}

/* problem list */
.probs{margin-top:22px;display:grid;gap:10px;counter-reset:p}
.probs li{list-style:none;display:grid;grid-template-columns:34px 1fr;gap:12px;padding:16px 18px;border-radius:12px;background:var(--card);box-shadow:var(--ring)}
.probs li::before{counter-increment:p;content:counter(p);width:26px;height:26px;border-radius:8px;background:var(--tint);display:grid;place-items:center;font-family:system-ui,sans-serif;font-size:12.5px;font-weight:600;color:var(--accent)}
.probs h3{font-size:17px}
.probs p{margin-top:4px;font-size:15.5px;color:var(--muted);line-height:1.5}

/* insight quote */
.insight{margin-top:30px;padding:24px 26px;border-radius:14px;background:var(--cell);box-shadow:var(--ring);font-size:21px;line-height:1.45;letter-spacing:-.005em}
.insight .small{display:block;margin-top:10px}

/* decision chapters */
.chapter{margin-top:56px}
.chapter:first-of-type{margin-top:34px}
.ch-head{display:flex;align-items:baseline;gap:12px}
.ch-no{font-family:system-ui,sans-serif;font-size:12px;font-weight:600;color:var(--accent);letter-spacing:.04em}
.options{margin-top:20px;display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.opt{padding:16px;border-radius:12px;background:transparent;box-shadow:var(--ring);display:flex;flex-direction:column}
.opt.pick{background:var(--card);box-shadow:0 0 0 1.5px var(--accent), var(--lift)}
.opt-tag{display:inline-flex;align-self:flex-start;align-items:center;height:22px;padding:0 8px;border-radius:6px;font-family:system-ui,sans-serif;font-size:11px;font-weight:600;letter-spacing:.04em;text-transform:uppercase;background:var(--tint);color:var(--muted)}
.opt.pick .opt-tag{background:color-mix(in srgb,var(--accent) 12%,transparent);color:var(--accent)}
.opt h4{margin-top:10px;font-size:16px;font-weight:600;line-height:1.3}
.opt p{margin-top:6px;font-family:system-ui,sans-serif;font-size:13px;line-height:1.5;color:var(--muted)}
.opt p b{color:var(--ink)}
.opt .shot{margin:0 0 12px;border-radius:9px;box-shadow:var(--ring)}
.verdict{margin-top:18px;padding-left:0;font-size:16.5px}
.verdict b{color:var(--accent)}

/* journey rows */
.steps{margin-top:22px;display:flex;align-items:center;gap:0;font-family:system-ui,sans-serif;font-size:12px;color:var(--muted)}
.steps span{display:flex;align-items:center;gap:8px;white-space:nowrap}
.steps span::before{content:'';width:9px;height:9px;border-radius:50%;background:var(--card);box-shadow:0 0 0 1.5px var(--faint)}
.steps span.on::before{background:var(--accent);box-shadow:0 0 0 1.5px var(--accent)}
.steps i{flex:1;height:1px;background:var(--line);margin:0 10px;min-width:16px}

.rows{margin-top:20px;display:grid;box-shadow:inset 0 1px 0 var(--line)}
.rows > div{display:grid;grid-template-columns:150px 1fr;gap:16px;padding:14px 0;box-shadow:inset 0 -1px 0 var(--line)}
.rows dt{font-family:system-ui,sans-serif;font-size:12px;font-weight:600;letter-spacing:.04em;text-transform:uppercase;color:var(--faint);padding-top:3px}
.rows dd{font-size:16px;line-height:1.5}

/* before / after pairs */
.pair{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.pair .lbl{display:block;margin-bottom:8px;font-family:system-ui,sans-serif;font-size:11px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--faint)}
.pair .lbl.after{color:var(--accent)}

/* before -> after table */
.ba{margin-top:20px;width:100%;border-collapse:collapse;font-size:15.5px}
.ba th{font-family:system-ui,sans-serif;font-size:11px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--faint);text-align:left;padding:0 12px 10px 0}
.ba td{padding:12px 12px 12px 0;box-shadow:inset 0 1px 0 var(--line);vertical-align:top;line-height:1.45}
.ba td:first-child{width:24%;font-family:system-ui,sans-serif;font-size:13px;font-weight:600;color:var(--ink)}
.ba td.was{color:var(--faint);width:36%}

/* learnings */
.learn{margin-top:22px;display:grid;gap:16px;counter-reset:l}
.learn li{list-style:none;display:grid;grid-template-columns:34px 1fr;gap:12px}
.learn li::before{counter-increment:l;content:'0' counter(l);font-family:system-ui,sans-serif;font-size:13px;font-weight:600;color:var(--accent);padding-top:4px}
.learn h3{font-size:18px}
.learn p{margin-top:4px;color:var(--muted);font-size:16px}

/* next project */
.next{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:26px 0;box-shadow:inset 0 1px 0 var(--line), inset 0 -1px 0 var(--line)}
.next .small{display:block}
.next h3{font-size:22px;font-weight:400;margin-top:4px;transition:color 150ms ease}
.next:hover h3{color:var(--accent)}

/* lightbox */
.lb{position:fixed;inset:0;z-index:100;display:grid;place-items:center;padding:32px;background:rgba(28,27,23,.72);opacity:0;pointer-events:none;transition:opacity 200ms ease;overflow:auto;overscroll-behavior:contain}
.lb.open{opacity:1;pointer-events:auto;cursor:zoom-in}
/* fit the whole screen in the window by default. 100% against an auto grid track doesn't
   constrain, which was cropping tall images, so size against the viewport instead. */
.lb img{max-width:min(1600px,100%);max-height:calc(100vh - 64px);border-radius:12px;box-shadow:0 20px 60px rgba(0,0,0,.35);transform:scale(.97);transition:transform 260ms var(--ease-out)}
.lb.open img{transform:none}
/* click once more for actual size, then the overlay scrolls */
.lb.full{place-items:start center;cursor:zoom-out}
.lb.full img{max-width:none;max-height:none;width:1600px}
@media (prefers-reduced-motion:reduce){.lb,.lb img,.shot img{transition:none}}

@media (max-width:1180px){
  .cs-nav,.cs-back{display:none}
}
@media (max-width:776px){
  .cs{padding:40px 28px 100px}
}
@media (max-width:1000px){
  .options{grid-template-columns:1fr}
  .meta-grid,.nums{grid-template-columns:1fr 1fr}
  .meta-grid div:nth-child(3){box-shadow:inset 0 1px 0 var(--line)}
  .meta-grid div:nth-child(4){box-shadow:inset 1px 0 0 var(--line), inset 0 1px 0 var(--line)}
}
@media (max-width:640px){
  .tldr,.pair{grid-template-columns:1fr}
  .tldr div:nth-child(even){padding-left:0;box-shadow:inset 0 -1px 0 var(--line)}
  .rows > div{grid-template-columns:1fr;gap:4px}
}

/* option thumbnails: same shape, cropped from the top */
.opt .shot{aspect-ratio:16/10}
.opt .shot img{width:100%;height:100%;object-fit:cover;object-position:top left}
.opt .shot.crop{aspect-ratio:var(--ar,16/9)}
.opt .shot.crop img{width:var(--s,180%);height:auto;object-fit:initial}
.lbl-row{display:block;margin:0 0 8px;font-family:system-ui,sans-serif;font-size:11px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--faint)}
.lbl-row.after{margin-top:16px;color:var(--accent)}
.opt .shot.btnshot{aspect-ratio:4/1}
.opt .shot.btnshot img{object-fit:contain;object-position:center}

/* hero preview video */
.vid{position:relative;border-radius:16px;overflow:hidden;background:var(--card);box-shadow:var(--ring), var(--lift);aspect-ratio:1440/1024}
.vid video{display:block;width:100%;height:100%;object-fit:cover}
.vid.wide-vid{aspect-ratio:1440/560;background:#FAF8F3}

/* staggered reveal: children of a group arrive one after another */
.stag > *{opacity:0;transform:translateY(14px)}
.stag.in > *{opacity:1;transform:none;transition:opacity .55s var(--ease-out),transform .65s var(--ease-out);transition-delay:calc(var(--i,0) * 80ms)}
.rv.stag{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.stag > *{opacity:1;transform:none}}
.nums b{font-variant-numeric:tabular-nums}

/* zoom cue: always visible as an icon so the screens read as openable; the label slides out on hover */
.zoom{position:absolute;right:12px;bottom:12px;z-index:2;display:flex;align-items:center;height:30px;padding:0 8px;border-radius:999px;
  background:rgba(28,27,23,.78);color:#FCFBF7;font-family:system-ui,sans-serif;font-size:12px;font-weight:500;letter-spacing:.01em;
  box-shadow:0 2px 10px rgba(0,0,0,.16);pointer-events:none;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px)}
.zoom svg{width:14px;height:14px;flex:none}
.zoom span{display:block;max-width:0;overflow:hidden;white-space:nowrap;opacity:0;
  transition:max-width 260ms var(--ease-out),opacity 180ms ease,margin 260ms var(--ease-out)}
@media (hover:hover){.shot:hover .zoom span,.shot:focus-visible .zoom span{max-width:120px;opacity:1;margin-left:6px}}
.opt .shot .zoom{right:8px;bottom:8px;height:26px;padding:0 7px}
.opt .shot .zoom svg{width:12px;height:12px}
@media (prefers-reduced-motion:reduce){.zoom span{transition:none}}
.lb-hint{position:fixed;left:50%;bottom:18px;transform:translateX(-50%);font-family:system-ui,sans-serif;font-size:12px;color:rgba(252,251,247,.75)}

/* evidence under each problem card: a labelled source row, not a quote */
.probs .heard{margin-top:12px;padding-top:12px;box-shadow:inset 0 1px 0 var(--line);
  display:grid;grid-template-columns:104px 1fr;gap:14px;align-items:baseline;
  font-size:15.5px;line-height:1.5;color:var(--ink)}
.probs .heard span{font-family:system-ui,sans-serif;font-size:11px;font-weight:600;letter-spacing:.05em;
  text-transform:uppercase;color:var(--faint);line-height:1.45}
@media (max-width:640px){.probs .heard{grid-template-columns:1fr;gap:4px}}

/* reframe: the brief vs the real problem */
.reframe{margin-top:30px;display:grid;grid-template-columns:1fr 1.6fr;border-radius:14px;background:var(--cell);box-shadow:var(--ring)}
.reframe div{padding:22px 24px}
.reframe div + div{box-shadow:inset 1px 0 0 var(--line)}
.reframe span{font-family:system-ui,sans-serif;font-size:11px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--faint)}
.reframe div + div span{color:var(--accent)}
.reframe p{margin-top:8px;font-size:19px;line-height:1.45}
.reframe div:first-child p{color:var(--muted)}

/* rejected ideas, one line each */
.tried{margin-top:22px;display:grid;box-shadow:inset 0 1px 0 var(--line)}
.tried .tried-h{margin:0;padding:12px 0 2px;font-family:system-ui,sans-serif;font-size:11px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--faint)}
.tried div{display:grid;grid-template-columns:230px 1fr;gap:16px;padding:12px 0;box-shadow:inset 0 -1px 0 var(--line)}
.tried b{font-size:15.5px;font-weight:600;line-height:1.4}
.tried span{font-family:system-ui,sans-serif;font-size:13.5px;line-height:1.5;color:var(--muted)}
.tried a{color:var(--accent);text-decoration:underline;text-underline-offset:2px}

/* solution points: imperative heading, 1-2 sentences, one screen */
.point{margin-top:44px}
.point h3{font-size:21px;font-weight:500}
.point > p{margin-top:8px;color:var(--muted)}
.cs-body > section > .ch-head + h2{margin-top:8px}

@media (max-width:640px){
  .reframe{grid-template-columns:1fr}
  .reframe div + div{box-shadow:inset 0 1px 0 var(--line)}
  .tried div{grid-template-columns:1fr;gap:4px}
}
.cs .context{margin-top:14px;color:var(--muted);font-size:16.5px}
.point + .tried{margin-top:40px}

/* before: the old tool, recreated with placeholder data */
.before{margin-top:26px}
.before figcaption b{display:inline-grid;place-items:center;width:18px;height:18px;margin-right:4px;border-radius:50%;background:#E8603C;color:#fff;font-size:11px}
/* ruled-out rows carry a low-fi thumbnail */
.tried div{grid-template-columns:200px 1fr;align-items:start}
.tried .shot{aspect-ratio:1400/860;border-radius:8px;box-shadow:var(--ring)}
.tried .shot .zoom{right:6px;bottom:6px;height:24px;padding:0 6px}
.tried .shot .zoom svg{width:11px;height:11px}
.tried div p{margin:0;display:grid;gap:4px}
@media (max-width:640px){.tried div{grid-template-columns:1fr}}

/* thanks line at the very end */
.cs .thanks{margin-top:0;text-align:center;font-size:17px;color:var(--muted)}
/* the same illustration as home, signing off */
.cs-sign{
  margin:76px auto 14px;height:118px;aspect-ratio:258/420;background:var(--ink);opacity:.9;
  -webkit-mask:url(assets/face/face-2.png) center/contain no-repeat;
          mask:url(assets/face/face-2.png) center/contain no-repeat;
}
/* next project sits on the right */
.next{justify-content:flex-end;text-align:right}
/* the zoom pill inside ruled-out rows keeps its own colours (the row's span style was greying it) */
.tried .shot .zoom,.tried .shot .zoom span{color:#FCFBF7;font-family:system-ui,sans-serif;font-size:12px;line-height:normal}

/* before / after slider */
.cmp-box{--p:50%;position:relative;overflow:hidden;border-radius:10px;border:1px solid var(--line);background:#1b1b1e;touch-action:pan-y;user-select:none;cursor:ew-resize}
.cmp-box img{display:block;width:100%;height:auto}
.cmp-b{position:absolute;inset:0;clip-path:inset(0 calc(100% - var(--p)) 0 0)}
.cmp-h{position:absolute;top:0;bottom:0;left:var(--p);width:2px;margin-left:-1px;background:#FCFBF7;box-shadow:0 0 0 1px rgba(0,0,0,.22)}
.cmp-h::after{content:"";position:absolute;top:50%;left:50%;width:40px;height:40px;margin:-20px 0 0 -20px;border-radius:50%;background:#FCFBF7;box-shadow:0 2px 10px rgba(0,0,0,.28);
  transition:transform 160ms cubic-bezier(.23,1,.32,1)}
.cmp-h::before{content:"";position:absolute;top:50%;left:50%;width:15px;height:9px;margin:-4.5px 0 0 -7.5px;z-index:1;
  background:currentColor;color:var(--ink);
  -webkit-mask:url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 15 9'%3E%3Cpath d='M4.2.6.8 4.5l3.4 3.9M10.8.6l3.4 3.9-3.4 3.9' fill='none' stroke='%23000' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/contain no-repeat;
          mask:url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 15 9'%3E%3Cpath d='M4.2.6.8 4.5l3.4 3.9M10.8.6l3.4 3.9-3.4 3.9' fill='none' stroke='%23000' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/contain no-repeat;
  transition:transform 160ms cubic-bezier(.23,1,.32,1)}
.cmp-box:hover .cmp-h::after,.cmp-h:focus-visible::after{transform:scale(1.08)}
.cmp-box.drag .cmp-h::after{transform:scale(.94)}
.cmp-box.drag .cmp-h::before{transform:scale(.94)}
.cmp-h:focus-visible{outline:none}
.cmp-h:focus-visible::after{box-shadow:0 0 0 3px var(--accent),0 2px 10px rgba(0,0,0,.28)}
.cmp-tag{position:absolute;bottom:12px;z-index:2;padding:5px 10px;border-radius:999px;background:rgba(14,14,16,.74);color:#FCFBF7;
  font-family:system-ui,sans-serif;font-size:10px;font-weight:600;line-height:1;
  letter-spacing:.09em;text-transform:uppercase;pointer-events:none;
  transition:opacity 200ms ease}
.cmp-tag.a{left:12px}.cmp-tag.b{right:12px}
.cmp-box.drag .cmp-tag{opacity:.35}
@media (prefers-reduced-motion:reduce){.cmp-h::after,.cmp-h::before,.cmp-tag{transition:none}}

/* problem section: 2x2 grid. Each card's number, heading, sentence and quote share rows with its neighbour (subgrid), so the quotes line up */
.nums-lbl{margin-top:28px}
.nums-lbl + .nums{margin-top:0}
.probs{grid-template-columns:1fr 1fr;column-gap:10px;row-gap:0}
.probs li{display:grid;grid-template-columns:1fr;grid-row:span 4;grid-template-rows:subgrid;row-gap:0;margin-bottom:10px;padding:18px 20px 16px}
.probs li::before{margin-bottom:14px}
.probs li > p:not(.heard){margin:6px 0 16px}
.probs li .heard{display:block;margin-top:0;padding-top:14px}
.probs li .heard span{display:block;margin-bottom:5px}
.method{margin-top:28px;padding:18px 22px;border-radius:12px;box-shadow:var(--ring)}
.method span{font-family:system-ui,sans-serif;font-size:11px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--faint)}
.method p{margin-top:6px;font-size:15.5px;line-height:1.55;color:var(--muted)}
@media (max-width:640px){.probs{grid-template-columns:1fr}}