/* REHAL case study */
@font-face{font-family:"Outfit";src:url(assets/fonts/Outfit.ttf) format("truetype");font-weight:100 900;font-display:swap}
@font-face{font-family:"Inter";src:url(assets/fonts/Inter.ttf) format("truetype");font-weight:100 900;font-display:swap}
@font-face{font-family:"Inter Tight";src:url(assets/fonts/InterTight.ttf) format("truetype");font-weight:100 900;font-display:swap}
@font-face{font-family:"Hand";src:url(assets/fonts/ShadowsIntoLightTwo.ttf) format("truetype");font-display:swap}

:root{--bg:#fafafa;--ink:#0d0d0d;--mut:#6a6c75;--line:#ececef;--lime:#b5f149;--vio:#6c7ff0;--ease:cubic-bezier(.22,1,.36,1);--spring:cubic-bezier(.34,1.56,.64,1)}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--ink);font-family:"Inter",system-ui,sans-serif;-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
img{display:block;max-width:100%}
.wrap{width:min(1100px,100% - 40px);margin:0 auto}
.eyebrow{display:inline-block;font:500 12px/1 "Inter";letter-spacing:.12em;text-transform:uppercase;color:#7b7e87}
::selection{background:var(--lime)}

/* reveal */
.rv{opacity:0;transform:translateY(26px);filter:blur(6px);transition:opacity .9s var(--ease),transform .9s var(--ease),filter .9s var(--ease);transition-delay:var(--d,0s)}
.rv.in{opacity:1;transform:none;filter:none}

/* ---------- top bar ---------- */
.cs-bar{position:fixed;z-index:50;top:16px;left:50%;transform:translateX(-50%);height:52px;width:min(1100px,100% - 32px);display:flex;align-items:center;gap:12px;padding:0 8px 0 18px;border-radius:999px;
  background:rgba(255,255,255,.78);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);box-shadow:0 0 0 1px rgba(0,0,0,.05),0 8px 24px -14px rgba(0,0,0,.25);overflow:hidden}
.cs-back{font:600 13.5px/1 "Inter";display:flex;align-items:center;gap:8px;white-space:nowrap}
.cs-back span{transition:transform .35s var(--spring)}
.cs-back:hover span{transform:translateX(-4px)}
.cs-chapters{display:flex;gap:4px;margin:0 auto}
.cs-chapters a{padding:8px 12px;border-radius:999px;font:500 13px/1 "Inter";color:#6a6c75;transition:background .3s,color .3s}
.cs-chapters a:hover{color:#111}
.cs-chapters a.on{background:#111;color:#fff}
.cs-me{display:flex;align-items:center;gap:8px;padding:5px 12px 5px 5px;border-radius:999px;background:#f3f4f6;font:600 13px/1 "Inter";white-space:nowrap}
.cs-me img{width:28px;height:30px;border-radius:50%;object-fit:cover}
.cs-progress{position:absolute;left:0;bottom:0;height:2px;width:0;background:linear-gradient(90deg,var(--vio),var(--lime))}

/* ---------- hero ---------- */
.hero{padding:150px 0 40px;overflow:hidden}
.hero h1{margin-top:18px;display:flex;flex-direction:column;gap:6px}
.h1-name{font:700 clamp(84px,14vw,180px)/.86 "Outfit";letter-spacing:-.07em;background:linear-gradient(180deg,#0d0d0d 55%,#464955);-webkit-background-clip:text;background-clip:text;color:transparent}
.h1-line{font:500 clamp(28px,3.6vw,46px)/1.08 "Inter Tight";letter-spacing:-.045em;color:#0d0d0d;max-width:820px}
.h1-line em{font-style:normal;color:#9a9ca3}
.hero-lead{margin-top:22px;max-width:600px;font:400 18px/1.6 "Inter";letter-spacing:-.015em;color:var(--mut)}
.meta{margin-top:40px;display:grid;grid-template-columns:repeat(4,1fr);gap:0;border-top:1px solid var(--line)}
.meta div{padding:18px 20px 0 0}
.meta dt{font:500 12px/1 "Inter";letter-spacing:.08em;text-transform:uppercase;color:#9a9ca3}
.meta dd{margin-top:8px;font:500 15px/1.4 "Inter";letter-spacing:-.01em}
.hero-stage{position:relative;width:min(1180px,100% - 40px);height:560px;margin:60px auto 0;border-radius:36px;
  background:radial-gradient(900px 400px at 50% 110%,rgba(181,241,73,.35),transparent 60%),radial-gradient(600px 300px at 10% 0%,rgba(108,127,240,.18),transparent 60%),#f1f2f5;overflow:hidden}
.shot{position:relative;border-radius:14px;overflow:hidden;background:#fff;box-shadow:0 0 0 1px rgba(0,0,0,.05),0 30px 60px -30px rgba(20,24,40,.45)}
.chrome{height:28px;display:flex;align-items:center;gap:6px;padding:0 12px;background:#f6f6f8;border-bottom:1px solid #ededf0}
.chrome i{width:8px;height:8px;border-radius:50%;background:#dedfe4}
.chrome i:nth-child(1){background:#ff6b5f}.chrome i:nth-child(2){background:#ffc23d}.chrome i:nth-child(3){background:#2ecb57}
.chrome span{margin-left:10px;font:500 11px/1 ui-monospace,Menlo,monospace;color:#9a9ca3}
.shot img{width:100%;height:auto}
.hero-stage .shot{position:absolute;transition:transform .8s var(--ease)}
.s-main{width:620px;left:50%;top:70px;margin-left:-310px;z-index:3}
.s-left{width:420px;left:6%;top:190px;z-index:2;rotate:-6deg}
.s-right{width:420px;right:6%;top:150px;z-index:2;rotate:6deg}
.float-chip{position:absolute;z-index:4;display:flex;align-items:center;gap:8px;padding:10px 14px;border-radius:999px;background:#111;color:#fff;font:600 13px/1 "Inter";box-shadow:0 14px 30px -12px rgba(0,0,0,.5);animation:bob 5s ease-in-out infinite}
.float-chip i{width:8px;height:8px;border-radius:50%;background:var(--lime);box-shadow:0 0 0 0 rgba(181,241,73,.6);animation:ping 2s infinite}
.float-chip.c1{left:calc(50% - 360px);top:44px}
.float-chip.c2{right:calc(50% - 350px);bottom:60px;background:var(--lime);color:#111;animation-delay:-2s}
@keyframes bob{0%,100%{translate:0 0}50%{translate:0 -10px}}
@keyframes ping{0%{box-shadow:0 0 0 0 rgba(181,241,73,.6)}80%,100%{box-shadow:0 0 0 8px rgba(181,241,73,0)}}

/* ---------- content blocks ---------- */
.block{padding:130px 0 0}
.two{display:grid;grid-template-columns:260px 1fr;gap:40px;align-items:start}
.label{position:sticky;top:100px;display:flex;align-items:center;gap:12px;font:500 13px/1 "Inter";letter-spacing:.08em;text-transform:uppercase;color:#7b7e87}
.label .num{display:grid;place-items:center;width:38px;height:38px;border-radius:12px;background:#111;color:var(--lime);font:600 14px/1 "Outfit";letter-spacing:0}
.block h2{font:600 clamp(32px,4vw,48px)/1.05 "Inter Tight";letter-spacing:-.045em;max-width:720px}
.block p{margin-top:16px;max-width:680px;font:400 17px/1.7 "Inter";letter-spacing:-.012em;color:#4a4c55}
.block p b{color:#111;font-weight:600}
.block p.lead{margin-top:18px;font:500 21px/1.5 "Inter Tight";letter-spacing:-.025em;color:#111}

.pull{margin:70px 0 0;padding:44px 48px;border-radius:28px;background:#111;color:#fff;font:500 clamp(24px,3vw,36px)/1.25 "Inter Tight";letter-spacing:-.035em}
.pull mark{background:none;color:var(--lime)}
.pull.small{margin:22px 0 0;padding:30px 34px;font-size:clamp(22px,2.4vw,28px)}
.pains{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:16px}
.pain{padding:28px 26px;border-radius:24px;background:#fff;box-shadow:inset 0 0 0 1px var(--line);transition:transform .5s var(--spring),box-shadow .4s}
.pain:hover{transform:translateY(-6px);box-shadow:inset 0 0 0 1px #e2e3e8,0 24px 40px -26px rgba(0,0,0,.35)}
.ico{display:grid;place-items:center;width:46px;height:46px;border-radius:14px;background:#f1ffd8}
.ico svg{width:22px;height:22px;fill:none;stroke:#111;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.pain h3{margin-top:22px;font:600 19px/1.2 "Inter Tight";letter-spacing:-.02em}
.pain p{margin-top:8px;font:400 15px/1.55 "Inter";color:var(--mut)}

.process{list-style:none;display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:50px}
.process li{display:flex;align-items:center;gap:14px;padding:20px 22px;border-radius:18px;background:#fff;box-shadow:inset 0 0 0 1px var(--line);font:500 16px/1.2 "Inter";letter-spacing:-.01em;color:#9a9ca3;transition:color .5s,background .5s,box-shadow .5s,transform .5s var(--spring)}
.process li em{font:600 13px/1 ui-monospace,Menlo,monospace;font-style:normal;color:#c4c6cc;transition:color .5s}
.process li.on{color:#111;box-shadow:inset 0 0 0 1px #dfe0e5}
.process li.on em{color:var(--vio)}
.process li:hover{transform:translateY(-3px);background:#111;color:#fff}
.process li:hover em{color:var(--lime)}

/* roles toggle */
.roles{margin-top:56px;padding:34px;border-radius:32px;background:#fff;box-shadow:inset 0 0 0 1px var(--line)}
.roles-top{display:flex;justify-content:space-between;align-items:flex-end;gap:20px;flex-wrap:wrap}
.roles-top h3{margin-top:10px;font:600 30px/1.1 "Inter Tight";letter-spacing:-.04em}
.seg{position:relative;display:flex;padding:5px;border-radius:999px;background:#f1f2f5}
.seg button{position:relative;z-index:1;height:40px;padding:0 18px;border-radius:999px;font:600 14px/1 "Inter";color:#6a6c75;transition:color .35s}
.seg button.on{color:#fff}
.seg-pill{position:absolute;top:5px;left:5px;height:40px;border-radius:999px;background:#111;transition:transform .5s var(--spring),width .5s var(--spring)}
.roles-body{display:grid;grid-template-columns:360px 1fr;gap:40px;margin-top:34px;align-items:center}
.role-copy{position:relative;min-height:260px}
.rc{position:absolute;inset:0;opacity:0;transform:translateY(12px);pointer-events:none;transition:opacity .45s,transform .6s var(--ease)}
.rc.on{opacity:1;transform:none;pointer-events:auto}
.rc h4{font:600 22px/1.25 "Inter Tight";letter-spacing:-.03em}
.rc p{margin-top:12px;font:400 15.5px/1.6 "Inter";color:var(--mut)}
.rc ul{list-style:none;display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.rc li{padding:8px 12px;border-radius:999px;background:#f3f4f6;font:500 13px/1 "Inter"}
.role-shot{position:relative;aspect-ratio:532/330}
.role-shot .shot{position:absolute;inset:0;opacity:0;transform:scale(.96) rotate(1.5deg);transition:opacity .5s,transform .7s var(--ease)}
.role-shot .shot.on{opacity:1;transform:none}

/* chain */
.chain{position:relative;display:grid;grid-template-columns:repeat(6,1fr);gap:12px;margin-top:56px}
.chain-line{position:absolute;left:8%;right:8%;top:37px;height:2px;background:#e4e5ea;z-index:0}
.chain-line i{position:absolute;left:0;top:0;height:100%;width:0;background:linear-gradient(90deg,var(--vio),var(--lime));transition:width .2s linear}
.step{position:relative;z-index:1;display:flex;flex-direction:column;align-items:center;text-align:center;gap:6px;padding:0 6px}
.step em{display:grid;place-items:center;width:74px;height:74px;border-radius:22px;background:#fff;box-shadow:inset 0 0 0 1px var(--line),0 10px 20px -16px rgba(0,0,0,.3);font:600 15px/1 "Outfit";font-style:normal;color:#b0b2b8;transition:background .5s,color .5s,transform .5s var(--spring)}
.step b{margin-top:10px;font:600 17px/1.2 "Inter Tight";letter-spacing:-.02em;color:#9a9ca3;transition:color .5s}
.step span{font:400 14px/1.3 "Inter";color:#b0b2b8;transition:color .5s}
.step.on em{background:#111;color:var(--lime);transform:translateY(-4px) rotate(-4deg)}
.step.on b{color:#111}.step.on span{color:var(--mut)}

.checks{list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:22px;max-width:680px}
.checks li{display:flex;align-items:center;gap:10px;padding:14px 16px;border-radius:14px;background:#fff;box-shadow:inset 0 0 0 1px var(--line);font:500 15px/1.3 "Inter"}
.checks li::before{content:"";flex:none;width:20px;height:20px;border-radius:50%;background:var(--lime) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M6 12.5l4 4 8-9' fill='none' stroke='%23111' stroke-width='2.6' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/14px no-repeat}

/* ---------- chapters (screens) ---------- */
.chapter{margin-top:140px;padding:110px 0 120px;background:#f1f2f5;border-radius:48px;width:calc(100% - 32px);margin-left:auto;margin-right:auto}
.chapter.dark{background:#0f1012;color:#fff}
.chapter-head{max-width:720px;margin-bottom:56px}
.chapter-head h2{margin-top:14px;font:600 clamp(32px,4.2vw,52px)/1.04 "Inter Tight";letter-spacing:-.05em}
.chapter-head p{margin-top:16px;font:400 17px/1.65 "Inter";color:var(--mut)}
.chapter.dark .chapter-head p{color:#9a9ca3}
.chapter.dark .eyebrow{color:#8a8c94}
.grid2,.grid3{display:grid;gap:18px;margin-top:18px}
.grid2{grid-template-columns:1fr 1fr}
.grid3{grid-template-columns:repeat(3,1fr)}
.card{margin:0}
.card figcaption{margin-top:14px;padding:0 4px}
.card figcaption b{display:block;font:600 17px/1.2 "Inter Tight";letter-spacing:-.02em}
.card figcaption span{display:block;margin-top:5px;font:400 14.5px/1.45 "Inter";color:var(--mut)}
.chapter.dark .card figcaption span{color:#9a9ca3}
.chapter.dark .shot{box-shadow:0 0 0 1px rgba(255,255,255,.08),0 30px 60px -30px rgba(0,0,0,.8)}
.chapter.dark .chrome{background:#1b1c20;border-color:#26272c}
.chapter.dark .chrome i{background:#34353b}
.zoomable{cursor:zoom-in;transition:transform .6s var(--ease),box-shadow .5s}
.zoomable img{transition:transform 1s var(--ease)}
.zoomable:hover{transform:translateY(-6px)}
.zoomable:hover img{transform:scale(1.03)}
.feature{display:grid;grid-template-columns:340px 1fr;gap:56px;align-items:center;margin:90px 0}
.feature.flip{grid-template-columns:1fr 340px}
.feature.flip .f-copy{order:2}
.f-copy h3{margin-top:12px;font:600 30px/1.1 "Inter Tight";letter-spacing:-.04em}
.f-copy p{margin-top:14px;font:400 16px/1.65 "Inter";color:var(--mut)}
.chapter.dark .f-copy p{color:#a3a5ad}
.choice{display:inline-flex;align-items:center;gap:8px;margin-top:20px;padding:10px 14px;border-radius:12px;background:#fff;box-shadow:inset 0 0 0 1px #e4e5ea;font:500 13.5px/1.35 "Inter";color:#111}
.choice::before{content:"";flex:none;width:8px;height:8px;border-radius:50%;background:var(--lime);box-shadow:0 0 0 3px #111}
.chapter.dark .choice{background:#1b1c20;box-shadow:inset 0 0 0 1px #2c2d33;color:#fff}

/* principles & outcome */
.principles,.outcomes{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:50px}
.pr{padding:30px 28px 32px;border-radius:24px 64px 24px 24px;background:#fff;box-shadow:inset 0 0 0 1px var(--line);transition:border-radius .7s var(--ease),transform .5s var(--spring)}
.pr:hover{border-radius:24px;transform:translateY(-6px)}
.pr em{font:700 36px/1 "Outfit";font-style:normal;background:linear-gradient(135deg,#a855f7,var(--vio));-webkit-background-clip:text;background-clip:text;color:transparent}
.pr h3{margin-top:24px;font:600 20px/1.2 "Inter Tight";letter-spacing:-.03em}
.pr p{margin-top:8px;font:400 15px/1.55 "Inter";color:var(--mut)}
.oc{padding:34px 30px;border-radius:28px;background:#111;color:#fff;overflow:hidden;position:relative;transition:transform .5s var(--spring)}
.oc:hover{transform:translateY(-6px)}
.oc::after{content:"";position:absolute;right:-60px;top:-60px;width:180px;height:180px;border-radius:50%;background:radial-gradient(circle,rgba(181,241,73,.35),transparent 70%)}
.oc b{display:block;font:700 48px/1 "Outfit";letter-spacing:-.05em;color:var(--lime)}
.oc h3{margin-top:26px;font:600 19px/1.2 "Inter Tight";letter-spacing:-.02em}
.oc p{margin-top:8px;font:400 15px/1.55 "Inter";color:#a3a5ad}
.learn{list-style:none;margin-top:22px;display:flex;flex-direction:column;gap:10px;max-width:680px}
.learn li{display:flex;gap:12px;padding:16px 18px;border-radius:16px;background:#fff;box-shadow:inset 0 0 0 1px var(--line);font:500 16px/1.45 "Inter";letter-spacing:-.01em}
.learn li::before{content:"→";color:var(--vio);font-weight:700}

/* end */
.end{padding:140px 0 60px}
.end .wrap{display:grid;grid-template-columns:1.2fr 1fr;gap:16px}
.end-card{padding:40px;border-radius:32px;background:#fff;box-shadow:inset 0 0 0 1px var(--line);display:flex;flex-direction:column;justify-content:space-between;gap:36px}
.author{display:flex;align-items:center;gap:12px}
.author img{width:48px;height:51px;border-radius:50%;object-fit:cover}
.author b{display:block;font:600 16px/1.2 "Inter"}
.author span{display:block;margin-top:3px;font:400 13.5px/1.2 "Inter";color:var(--mut)}
.end-card h2{font:600 clamp(28px,3vw,38px)/1.1 "Inter Tight";letter-spacing:-.04em}
.end-links{display:flex;gap:8px;flex-wrap:wrap}
.end-links a{height:44px;padding:0 18px;display:inline-flex;align-items:center;border-radius:999px;background:#f3f4f6;font:600 14px/1 "Inter";transition:background .3s,color .3s,transform .4s var(--spring)}
.end-links a:hover{background:#111;color:#fff;transform:translateY(-2px)}
.next{position:relative;overflow:hidden;padding:36px;border-radius:32px;background:#e9e3fb;display:flex;flex-direction:column;gap:10px;min-height:340px}
.next b{font:600 28px/1.1 "Inter Tight";letter-spacing:-.04em;max-width:320px}
.next-go{font:600 14px/1 "Inter";color:#4b3a8f}
.next img{position:absolute;right:-40px;bottom:-30px;width:78%;border-radius:14px;box-shadow:0 30px 60px -30px rgba(40,20,90,.5);transform:rotate(-4deg);transition:transform .7s var(--ease)}
.next:hover img{transform:rotate(0) translateY(-10px)}

/* lightbox */
.lb{position:fixed;inset:0;z-index:100;display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:20px;padding:40px;background:rgba(10,10,12,.86);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);opacity:0;pointer-events:none;transition:opacity .35s}
.lb.open{opacity:1;pointer-events:auto}
.lb figure{justify-self:center;max-width:min(1100px,100%);transform:scale(.94);transition:transform .5s var(--spring)}
.lb.open figure{transform:none}
.lb img{width:100%;max-height:80vh;object-fit:contain;border-radius:14px;background:#fff}
.lb figcaption{margin-top:14px;text-align:center;font:500 14px/1.4 "Inter";color:#cfd1d6}
.lb-x,.lb-nav{width:48px;height:48px;border-radius:50%;background:rgba(255,255,255,.1);color:#fff;font:400 22px/1 "Inter";transition:background .3s}
.lb-x:hover,.lb-nav:hover{background:rgba(255,255,255,.22)}
.lb-x{position:absolute;top:22px;right:22px}

/* ---------- responsive ---------- */
@media (max-width:900px){
  .cs-chapters{display:none}.cs-bar{justify-content:space-between}
  .meta{grid-template-columns:1fr 1fr;row-gap:18px}
  .hero-stage{height:420px}
  .s-main{width:78%;margin-left:-39%;top:60px}.s-left,.s-right{width:52%;top:200px}
  .float-chip.c1{left:16px}.float-chip.c2{right:16px}
  .two{grid-template-columns:1fr;gap:20px}.label{position:static}
  .pains,.process,.principles,.outcomes,.grid3{grid-template-columns:1fr}
  .grid2{grid-template-columns:1fr}
  .roles{padding:22px}.roles-body{grid-template-columns:1fr}.role-copy{min-height:300px}
  .chain{grid-template-columns:repeat(3,1fr);row-gap:30px}.chain-line{display:none}
  .checks{grid-template-columns:1fr}
  .feature,.feature.flip{grid-template-columns:1fr;gap:26px;margin:60px 0}.feature.flip .f-copy{order:0}
  .chapter{border-radius:28px;padding:70px 0}
  .end .wrap{grid-template-columns:1fr}
  .pull{padding:30px 26px}
  .lb{grid-template-columns:1fr;padding:16px}.lb-nav{display:none}
}
@media (prefers-reduced-motion:reduce){.rv{opacity:1;transform:none;filter:none;transition:none}*{animation:none!important}}