/* ============================================================
   Factile Customization — scroll case study
   Editorial, self-guided. Authored voice (not product chrome).
   ============================================================ */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
@import url('https://fonts.googleapis.com/css2?family=Google+Sans+Flex:opsz,wght@8..144,400..700&display=swap');
:root{
  --paper:#FFFFFF;--ink:#1D1C22;--body:#36353D;--muted:#66656E;--line:#E4E3E8;--card:#FFFFFF;
  --accent:#4F46E5;--accent-tint:#F4F3FC;
  --l1:#4F46E5;--l1-bg:#F4F3FC;    /* UI debt */
  --l2:#AD4700;--l2-bg:#FFFABC;    /* interaction debt */
  --l3:#4338CA;--l3-bg:#E7E5F7;    /* product-model debt */
  --ok:#1F7A43;--ok-bg:#E9F5EE;--bad:#E03A3A;--bad-bg:#FBECEA;
  --disp:'Google Sans Flex','Google Sans',Roboto,-apple-system,sans-serif;--sans:'Google Sans Flex','Google Sans',Roboto,-apple-system,sans-serif;--mono:ui-monospace,'SFMono-Regular',monospace;
  --wrap:1080px;--band:1360px;--edge:clamp(22px,5vw,64px);
  --r:14px;--r-sm:10px;
  --sh-sm:0 1px 3px rgba(0,0,0,.06);--sh:0 1px 4px rgba(0,0,0,.06),0 4px 12px rgba(0,0,0,.04);--sh-lg:0 8px 40px rgba(0,0,0,.18);
}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
[data-layer],[data-nav]{scroll-margin-top:80px}
body{background:var(--paper);color:var(--body);font-family:var(--sans);font-weight:400;font-size:16px;line-height:1.55;letter-spacing:0;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;overflow-x:hidden}
img{display:block;max-width:100%}
a{color:var(--accent);text-decoration:none}a:hover{color:var(--l3)}
::selection{background:var(--accent);color:#fff}
.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--edge)}
.band{width:100%;max-width:var(--band);margin-inline:auto;padding-inline:var(--edge)}

/* progress + top bar */
.topmask{position:fixed;inset:0 0 auto 0;height:58px;z-index:59;background:rgba(252,251,248,.86);backdrop-filter:saturate(140%) blur(12px);-webkit-backdrop-filter:saturate(140%) blur(12px);border-bottom:1px solid var(--line);pointer-events:none}
.topbar{position:fixed;inset:0 0 auto 0;z-index:60;height:3px;background:transparent}
.topbar .fill{height:100%;width:0;background:var(--accent);transition:width .1s linear}
.badge-home{position:fixed;top:20px;left:var(--edge);z-index:61;font-family:var(--mono);font-size:13px;letter-spacing:.04em;color:var(--muted);display:inline-flex;align-items:center;gap:9px;text-decoration:none;transition:color .2s}
.badge-home:hover{color:var(--ink)}
.badge-home:hover b{color:var(--accent)}
.badge-home .bh-arrow{width:16px;height:16px;flex:none;transition:transform .25s}
.badge-home:hover .bh-arrow{transform:translateX(-3px)}
.badge-home b{color:var(--ink);font-weight:500}
.badge-home .d{width:8px;height:8px;border-radius:50%;background:var(--l3)}

/* typography */
.kicker{font-family:var(--mono);font-size:14px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted)}
.kpill{display:inline-flex;align-items:center;gap:8px;font-family:var(--sans);font-size:12px;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--accent);background:var(--accent-tint);padding:8px 16px;border-radius:99px}
.pcards{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.pcard{border:1px solid var(--line);border-radius:14px;background:var(--card);padding:24px 26px}
.pcard b{display:block;font-family:var(--sans);font-weight:700;font-size:17px;color:var(--ink);margin-bottom:10px}
.pcard p{font-size:15.5px;line-height:1.6;color:var(--muted);margin:0}
.pcard p + p{margin-top:12px}
h1{font-family:var(--disp);font-weight:700;font-size:clamp(40px,6vw,76px);line-height:1.06;letter-spacing:-.03em;color:var(--accent);text-wrap:balance;overflow:visible;padding-bottom:.1em;margin-bottom:-.1em}
h2{font-family:var(--disp);font-weight:700;font-size:clamp(28px,4vw,44px);line-height:1.15;letter-spacing:-.02em;color:var(--ink);text-wrap:balance;overflow:visible;padding-bottom:.1em;margin-bottom:-.1em}
h3{font-family:var(--disp);font-weight:700;font-size:clamp(20px,2.2vw,24px);line-height:1.2;letter-spacing:-.01em;color:var(--ink)}
.lead{font-size:clamp(21px,1.9vw,27px);line-height:1.5;color:var(--body)}
.dek{font-size:clamp(19px,1.5vw,22px);line-height:1.6;color:var(--muted);text-wrap:pretty}
em.hl{font-style:normal;color:var(--accent);font-weight:700}
strong{color:var(--ink);font-weight:700}

/* section rhythm */
section{padding-block:clamp(64px,9vh,128px)}
section.tight{padding-block:clamp(40px,6vh,72px)}
.sechead{max-width:60ch}
.sechead h2{margin-top:14px}
.sechead .dek{margin-top:20px}

/* hero */
.hero{padding-top:clamp(120px,17vh,220px);padding-bottom:clamp(48px,7vh,96px)}
.hero h1{margin-top:24px}
.hero .thesis{font-family:var(--disp);font-weight:500;font-size:clamp(24px,3vw,40px);line-height:1.22;letter-spacing:-.02em;color:var(--body);max-width:22ch;margin-top:40px;text-wrap:balance}
.hero .thesis b{color:var(--ink);font-weight:800}
.metarow{display:flex;flex-wrap:wrap;gap:36px 56px;margin-top:56px;padding-top:32px;border-top:1px solid var(--line)}
.metarow .m .k{font-family:var(--mono);font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);display:block;margin-bottom:8px}
.metarow .m .v{font-family:var(--disp);font-weight:600;font-size:20px;color:var(--ink);letter-spacing:-.01em;max-width:26ch}
.honesty{display:flex;gap:14px;align-items:flex-start;margin-top:40px;padding:18px 22px;background:var(--accent-tint);border:1px solid #D5E3F1;border-radius:var(--r-sm);max-width:74ch}
.honesty svg{width:22px;height:22px;color:var(--accent);flex:none;margin-top:1px}
.honesty p{font-size:16px;line-height:1.5;color:var(--body)}
.honesty b{color:var(--ink)}

/* pointer lists (no chunky paragraphs) */
.plist{display:flex;flex-direction:column;gap:18px}
.pli{display:flex;gap:16px;align-items:flex-start;font-size:19px;line-height:1.5}
.pli .pb{flex:none;width:11px;height:11px;border-radius:3px;margin-top:9px;background:var(--accent)}
.pli b{color:var(--ink)}

/* two-column split */
.split{display:grid;grid-template-columns:1.15fr 1fr;gap:clamp(36px,5vw,80px);align-items:center}
.split.img-right{grid-template-columns:1fr 1.15fr}
.split .colw{min-width:0}

/* framed images + lightbox trigger */
.frame{position:relative;border-radius:var(--r);overflow:hidden;border:1px solid var(--line);background:#fff;box-shadow:var(--sh)}
.frame img{width:100%;height:auto;cursor:zoom-in}
.frame.crop{max-height:230px}.frame.crop img{height:230px;object-fit:cover;object-position:top}
.dscta{display:inline-flex;align-items:center;gap:10px;margin-top:20px;padding:14px 24px;border-radius:99px;background:var(--accent);color:#fff;font-family:var(--sans);font-weight:700;font-size:15px;text-decoration:none;transition:transform .2s,box-shadow .2s}
.dscta:hover{transform:translateY(-2px);box-shadow:0 10px 24px -8px color-mix(in srgb, var(--accent) 55%, transparent);color:#fff;background:color-mix(in srgb, var(--accent) 82%, #000)}
.cap{font-family:var(--mono);font-size:13px;letter-spacing:.02em;color:var(--muted);margin-top:14px;display:flex;align-items:center;gap:10px}
.tag{font-family:var(--mono);font-size:12px;font-weight:500;padding:4px 11px;border-radius:99px}
.tag.b{color:var(--bad);background:var(--bad-bg)}.tag.a{color:var(--ok);background:var(--ok-bg)}
.tag.it{color:var(--accent);background:var(--accent-tint)}

/* debt framework cards */
.debtgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:56px}
.dcard{background:var(--card);border:1px solid var(--line);border-radius:var(--r);border-top:3px solid var(--accent);padding:34px 32px;box-shadow:var(--sh-sm);display:flex;flex-direction:column;gap:14px}
.dcard.l1{border-top-color:var(--l1)}.dcard.l2{border-top-color:var(--l2)}.dcard.l3{border-top-color:var(--l3)}
.dchip{align-self:flex-start;display:inline-flex;align-items:center;gap:10px;font-family:var(--mono);font-size:13px;letter-spacing:.04em;padding:7px 14px;border-radius:99px;font-weight:500}
.dchip .dot{width:11px;height:11px;border-radius:50%}
.l1 .dchip{background:var(--l1-bg);color:var(--l1)}.l1 .dchip .dot{background:var(--l1)}
.l2 .dchip{background:var(--l2-bg);color:var(--l2)}.l2 .dchip .dot{background:var(--l2)}
.l3 .dchip{background:var(--l3-bg);color:var(--l3)}.l3 .dchip .dot{background:var(--l3)}
.dcard .dt{font-family:var(--disp);font-weight:700;font-size:24px;color:var(--ink);letter-spacing:-.01em}
.dcard .dd{font-size:17px;color:var(--muted);line-height:1.5}
.dcard ul{list-style:none;display:flex;flex-direction:column;gap:10px;margin-top:4px}
.dcard li{font-size:16px;line-height:1.4;color:var(--body);padding-left:24px;position:relative}
.dcard li::before{content:"";position:absolute;left:0;top:9px;width:9px;height:9px;border-radius:2px;background:currentColor;opacity:.55}
.l1 li{color:var(--l1)}.l2 li{color:var(--l2)}.l3 li{color:var(--l3)}
.dcard li span{color:var(--body)}

/* layer section header + sticky rail */
.layerhead{display:flex;align-items:center;gap:20px}
.layernum{font-family:var(--disp);font-weight:800;font-size:clamp(40px,5vw,68px);line-height:1;letter-spacing:-.03em}
.l1 .layernum,.lh-l1{color:var(--l1)}.l2 .layernum,.lh-l2{color:var(--l2)}.l3 .layernum,.lh-l3{color:var(--l3)}
.rail{position:fixed;left:var(--edge);top:96px;z-index:40;display:flex;flex-direction:column;gap:14px;opacity:0;transition:opacity .4s;pointer-events:none}
.rail.show{opacity:1;pointer-events:auto}
.rail a{display:flex;align-items:center;gap:11px;font-family:var(--mono);font-size:11px;letter-spacing:.02em;color:var(--muted)}
.rail .rdot{width:12px;height:12px;border-radius:50%;border:2px solid var(--line);background:var(--paper);transition:.25s}
.rail a.on .rdot{border-color:currentColor;background:currentColor}
.rail a.on{color:var(--ink)}
.rail a[data-l="1"].on{color:var(--l1)}.rail a[data-l="2"].on{color:var(--l2)}.rail a[data-l="3"].on{color:var(--l3)}
@media(max-width:1420px){.rail .rtxt{display:none}}
@media(max-width:1170px){.rail{display:none}}

/* annotated screenshot */
.annot{position:relative;border-radius:var(--r);overflow:hidden;border:1px solid var(--line);box-shadow:var(--sh);background:#fff}
.annot img{width:100%;cursor:zoom-in}
.annot .ring{position:absolute;border:3px solid var(--l1);border-radius:8px;box-shadow:0 0 0 4px rgba(31,95,166,.16);pointer-events:none}
.annot .pin{position:absolute;width:40px;height:40px;border-radius:50%;background:var(--l1);color:#fff;font-family:var(--disp);font-weight:800;font-size:20px;display:flex;align-items:center;justify-content:center;transform:translate(-50%,-50%);box-shadow:0 0 0 5px rgba(31,95,166,.2),0 4px 12px rgba(0,0,0,.25)}
.ptrs{display:flex;flex-direction:column;gap:24px}
.ptr{display:flex;gap:16px;align-items:flex-start}
.ptr .pn{width:40px;height:40px;border-radius:50%;background:var(--l1);color:#fff;font-family:var(--disp);font-weight:800;font-size:19px;display:flex;align-items:center;justify-content:center;flex:none}
.ptr .ptt{font-family:var(--disp);font-weight:700;font-size:22px;color:var(--ink);line-height:1.2}
.ptr .ptd{font-size:17px;color:var(--muted);margin-top:4px;line-height:1.45}

/* zoom-detail cards */
.zoomrow{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.zc{background:#fff;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;box-shadow:var(--sh-sm)}
.zc .zi{height:210px;background:var(--paper);border-bottom:1px solid var(--line);overflow:hidden;display:flex;align-items:center;justify-content:center}
.zc .zi img{width:100%;height:100%;object-fit:contain;cursor:zoom-in}
.zc .zb{padding:18px 22px}
.zc .zt{font-family:var(--disp);font-weight:700;font-size:20px;color:var(--ink)}
.zc .zd{font-size:15px;color:var(--muted);margin-top:5px;line-height:1.45}

/* before/after slider */
.baframe{display:flex;flex-direction:column;gap:16px}
.ba{position:relative;width:100%;border-radius:var(--r);overflow:hidden;border:1px solid var(--line);box-shadow:var(--sh);user-select:none;cursor:ew-resize}
.ba>img{width:100%;height:auto;pointer-events:none;display:block}
.ba .after-lyr{position:absolute;inset:0;overflow:hidden;width:50%}
.ba .after-lyr img{position:absolute;top:0;left:0;height:100%;width:auto;max-width:none;pointer-events:none}
.ba .handle{position:absolute;top:0;bottom:0;left:50%;width:3px;background:#fff;box-shadow:0 0 0 1px rgba(0,0,0,.12);transform:translateX(-1.5px);z-index:3}
.ba .handle::after{content:"";position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:54px;height:54px;border-radius:50%;background:#fff;box-shadow:var(--sh)}
.ba .handle .arr{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);z-index:2;display:flex;gap:14px;font-size:22px;color:var(--accent);font-weight:900;line-height:1}
.balabels{display:flex;gap:40px}
.balabels .cap{margin-top:0}

/* was/now */
.wn{display:flex;flex-direction:column;gap:26px}
.wn-row .wl{display:inline-flex;align-items:center;gap:11px;font-family:var(--disp);font-weight:700;font-size:21px;margin-bottom:10px}
.wl.bad{color:var(--bad)}.wl.bad::before{content:"WAS";font-family:var(--mono);font-size:12px;font-weight:500;background:var(--bad-bg);padding:4px 10px;border-radius:99px}
.wl.good{color:var(--ok)}.wl.good::before{content:"NOW";font-family:var(--mono);font-size:12px;font-weight:500;background:var(--ok-bg);padding:4px 10px;border-radius:99px}

/* flowchart */
.fstart{display:flex;flex-direction:column;align-items:center;gap:0;margin-bottom:6px}
.fnode{background:#fff;border:1.5px solid var(--line);border-radius:10px;padding:14px 22px;font-size:18px;font-weight:600;color:var(--body);text-align:center;line-height:1.2}
.fstart .fnode{border-color:#C9D9E8}
.fstart .down{width:3px;height:24px;background:var(--muted);opacity:.4}
.fchart{display:flex;align-items:center;gap:36px;justify-content:center;flex-wrap:wrap}
.fdiamond{flex:none;width:250px;height:180px;display:flex;align-items:center;justify-content:center;text-align:center;background:var(--l3);color:#fff;clip-path:polygon(50% 0,100% 50%,50% 100%,0 50%);font-size:17px;font-weight:600;font-family:var(--sans);line-height:1.2;padding:0 40px}
.fbranches{position:relative;display:flex;flex-direction:column;gap:38px;padding-left:32px}
.fbranches::before{content:"";position:absolute;left:0;top:14%;bottom:14%;width:3px;background:var(--l3);border-radius:2px}
.fpath{position:relative;display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.fpath::before{content:"";position:absolute;left:-32px;top:50%;width:32px;height:3px;background:var(--l3)}
.fcond{flex:none;font-family:var(--mono);font-size:16px;padding:7px 14px;border-radius:99px}
.fcond.g1{color:var(--l1);background:var(--l1-bg)}.fcond.g2{color:var(--l3);background:var(--l3-bg)}
.fpath .fnode.end{background:var(--l1-bg);border-color:#C9D9E8;color:var(--l1);font-weight:700}
.farr{flex:none;color:var(--l3);font-size:22px;font-weight:800}
.fsteps{flex:none;font-family:var(--mono);font-size:14px;padding:4px 11px;border-radius:99px}
.fsteps.few{color:var(--ok);background:var(--ok-bg)}.fsteps.many{color:var(--bad);background:var(--bad-bg)}
.flow{display:flex;align-items:stretch;gap:0;flex-wrap:wrap}
.flow .step{flex:1;min-width:130px;background:#fff;border:1.5px solid var(--line);border-radius:10px;padding:16px 18px;font-size:17px;font-weight:600;color:var(--body);text-align:center;display:flex;align-items:center;justify-content:center}
.flow.after .step{background:var(--l1-bg);border-color:#C9D9E8}
.flow .arrow{flex:none;width:44px;display:flex;align-items:center;justify-content:center;font-size:24px;color:var(--accent);font-weight:800}
/* vertical flowchart (top-to-bottom) */
.vflow{display:flex;flex-direction:column;align-items:center}
.vconn{width:3px;height:22px;border-radius:2px;background:var(--l3);opacity:.55}
.vconn.g{background:#C4C1B8;opacity:1}.vconn.a{background:var(--accent);opacity:.8}
.vsplit{display:grid;grid-template-columns:1fr 1fr;gap:clamp(24px,4vw,60px);width:100%;max-width:780px;margin-top:6px;align-items:start}
.vcol{display:flex;flex-direction:column;align-items:center;text-align:center}
.vcol .fnode{width:100%}
.vcol .fcond{margin-bottom:0}
.vsteps-b{margin-top:14px}

/* interventions list */
.intv{display:flex;flex-direction:column;gap:clamp(56px,8vh,110px)}
.chipsrow{display:flex;flex-wrap:wrap;gap:12px;margin-top:8px}
.chip{background:var(--accent-tint);color:var(--accent);border:1px solid #D5E3F1;border-radius:99px;padding:11px 20px;font-weight:600;font-size:16px}

/* outcome / iteration framing */
.pills{display:flex;flex-wrap:wrap;gap:14px;margin-top:28px}
.metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(24px,4vw,56px);margin-top:48px}
.metric{border-top:2px solid var(--accent);padding-top:20px}
.metric .n{font-family:var(--disp);font-weight:800;font-size:clamp(38px,5vw,64px);line-height:.9;letter-spacing:-.03em;color:var(--ink)}
.metric .l{margin-top:12px;color:var(--muted);font-size:17px;max-width:26ch}

/* design-system board */
.dsboard{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:44px}
.tile{background:#fff;border:1px solid var(--line);border-radius:var(--r-sm);padding:24px;box-shadow:var(--sh-sm)}
.tile .tl{font-family:var(--mono);font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin-bottom:16px}
.swrow{display:flex;gap:9px}.swrow i{width:44px;height:44px;border-radius:8px;border:1px solid rgba(0,0,0,.06)}
.tydemo b{display:block;font-family:var(--disp);font-size:38px;font-weight:800;color:var(--ink);line-height:1}.tydemo small{font-size:15px;color:var(--muted)}
.raddemo{display:flex;gap:12px;align-items:flex-end}.raddemo i{background:var(--accent-tint);border:1.5px solid #C9D9E8;width:48px;height:48px}
.btnrow{display:flex;gap:10px}.bd{height:46px;padding:0 20px;border-radius:10px;font-weight:700;font-size:17px;display:inline-flex;align-items:center}.bd.p{background:var(--accent);color:#fff}.bd.s{background:#fff;color:var(--accent);border:1.5px solid var(--line)}
.stdemo{display:inline-flex;align-items:center;gap:9px;font-weight:600;font-size:16px;color:var(--ok)}.stdemo .d{width:12px;height:12px;border-radius:50%;background:var(--ok)}

/* reflection */
.reflect{display:grid;grid-template-columns:repeat(2,1fr);gap:22px;margin-top:48px;max-width:840px}
.rc{background:var(--card);border:1px solid var(--line);border-top:3px solid var(--accent);border-radius:var(--r);padding:28px;display:flex;flex-direction:column;gap:11px}
.rc.l1{border-top-color:var(--l1)}.rc.l2{border-top-color:var(--l2)}.rc.l3{border-top-color:var(--l3)}
.rc .rtag{font-family:var(--mono);font-size:12px;letter-spacing:.06em;text-transform:uppercase}
.rc.l1 .rtag{color:var(--l1)}.rc.l2 .rtag{color:var(--l2)}.rc.l3 .rtag{color:var(--l3)}
.rc .rt{font-family:var(--disp);font-weight:700;font-size:22px;color:var(--ink);line-height:1.15}
.rc .rd{font-size:16px;color:var(--body);line-height:1.5}

/* closing */
.closing{background:var(--ink);color:#fff}
.closing h2{color:#fff}
.closing .dek{color:#B8B9C0}
.closing .tracks{display:flex;flex-wrap:wrap;gap:16px;margin-top:44px}
.closing .tk{display:inline-flex;align-items:center;gap:11px;font-family:var(--mono);font-size:15px;padding:13px 22px;border-radius:99px;background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.14)}
.closing .tk .dot{width:11px;height:11px;border-radius:50%}
.closing .tk.l1 .dot{background:#6BA8DC}.closing .tk.l2 .dot{background:#E0A94E}.closing .tk.l3 .dot{background:#E56AA0}
.foot{border-top:1px solid rgba(255,255,255,.12);margin-top:56px;padding:44px 0 60px;display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;color:var(--muted);font-family:var(--mono);font-size:13px}

/* reveal */
.rise{opacity:0;transform:translateY(28px);transition:opacity .8s cubic-bezier(.2,.8,.2,1),transform .8s cubic-bezier(.2,.8,.2,1)}
.rise.in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){.rise{opacity:1;transform:none;transition:none}html{scroll-behavior:auto}}

/* lightbox */
.lightbox{position:fixed;inset:0;z-index:200;background:rgba(16,18,22,.93);display:none;align-items:center;justify-content:center;padding:56px}
.lightbox.open{display:flex}
.lightbox img{max-width:94vw;max-height:90vh;border-radius:12px;box-shadow:var(--sh-lg);background:#fff}
.lightbox .lbx{position:fixed;top:24px;right:30px;width:54px;height:54px;border-radius:50%;border:none;background:rgba(255,255,255,.15);color:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center}
.lightbox .lbx:hover{background:rgba(255,255,255,.28)}.lightbox .lbx svg{width:26px;height:26px}

@media(max-width:820px){
  .pcards{grid-template-columns:1fr}
  .split,.split.img-right{grid-template-columns:1fr;gap:36px}
  .debtgrid,.zoomrow,.reflect{grid-template-columns:1fr}
  .metrics{grid-template-columns:1fr}
  .dsboard{grid-template-columns:1fr 1fr}
  .annot{order:-1}
}