/* rootcause.studio home: scroll-driven app showcase. Brand tokens live in rc.css / styles.css. */
.rc-home{--gut:clamp(20px,4vw,48px);background:#fff;color:var(--rc-ink)}
.rc-home main{display:block}
.h-wrap{max-width:1200px;margin:0 auto;padding:0 var(--gut)}
.grad-l{background:linear-gradient(92deg,#0f5a30 0%,#1a7f45 40%,#46b578 100%);-webkit-background-clip:text;background-clip:text;color:transparent}

/* reveal on scroll */
.rv{opacity:0;transform:translateY(28px);transition:opacity .9s var(--rc-ease),transform 1s var(--rc-ease)}
.rv.in{opacity:1;transform:none}

/* ---------- hero ---------- */
.h-hero{height:210vh;position:relative;background:radial-gradient(120% 80% at 50% 0%,#f3fbf5 0%,#fff 60%)}
.h-sticky{position:sticky;top:0;height:100vh;height:100lvh;overflow:hidden}
.h-glow{position:absolute;left:50%;top:62%;width:min(120vw,1100px);aspect-ratio:1;transform:translate(-50%,-50%);background:radial-gradient(closest-side,rgba(125,199,154,.42),rgba(226,244,232,.3) 55%,transparent 75%);pointer-events:none}
.h-marquee{position:absolute;top:50%;left:0;transform:translate3d(40vw,-50%,0);white-space:nowrap;font-size:clamp(110px,22vw,320px);font-weight:820;letter-spacing:-.06em;line-height:1;color:#1a7f45;opacity:0;pointer-events:none;will-change:transform,opacity}
.h-hero-copy{position:absolute;inset:clamp(96px,15vh,150px) var(--gut) auto;text-align:center;z-index:2;will-change:transform,opacity}
.h-hero-title{margin:0 auto;font-size:clamp(44px,min(7.6vw,10.5vh),112px);font-weight:820;letter-spacing:-.055em;line-height:.95;max-width:12ch}
.h-hero-title span{display:inline-block;opacity:0;transform:translateY(40px);animation:h-in 1s var(--rc-ease) forwards}
.h-hero-title span:nth-child(2){animation-delay:.12s}.h-hero-title span:nth-child(3){animation-delay:.24s}
@keyframes h-in{to{opacity:1;transform:none}}
.h-hero-sub{max-width:30em;margin:22px auto 0;font-size:clamp(17px,1.5vw,21px);line-height:1.5;color:#38383b;opacity:0;animation:h-in 1s .4s var(--rc-ease) forwards}
.h-cta{display:flex;flex-direction:column;align-items:center;gap:12px;margin-top:30px;opacity:0;animation:h-in 1s .55s var(--rc-ease) forwards}
.h-free{font-size:14px;font-weight:560;color:#5e5e63}
.h-hero-phone{position:absolute;left:50%;top:86vh;transform:translate3d(-50%,0,0);z-index:1;will-change:transform}
.h-hero-phone .rc-phone{--pw:min(26vw,36vh,330px) !important}

/* ---------- stat ---------- */
.h-stat{padding:clamp(100px,16vh,180px) 0 40px;text-align:center}
.h-count{font-size:clamp(110px,20vw,260px);font-weight:820;letter-spacing:-.07em;line-height:.9;margin:0;background:linear-gradient(180deg,#0b0b0c 30%,#1a7f45);-webkit-background-clip:text;background-clip:text;color:transparent;font-variant-numeric:tabular-nums}
.h-stat-line{font-size:clamp(22px,2.6vw,36px);font-weight:700;letter-spacing:-.035em;line-height:1.2;margin:18px auto 0;max-width:22ch;color:#38383b}
.h-strike{text-decoration:none;background:linear-gradient(#d0453a,#d0453a) 0 58%/0% 4px no-repeat;transition:background-size 1.1s .5s var(--rc-ease)}
.rv.in .h-strike{background-size:100% 4px}
.h-but{font-size:clamp(24px,2.9vw,40px);font-weight:780;letter-spacing:-.04em;line-height:1.15;margin:clamp(24px,4vh,40px) auto 0;max-width:20ch;color:#0b0b0c}
.h-fix{font-size:clamp(48px,8vw,110px);font-weight:820;letter-spacing:-.055em;margin:clamp(36px,6vh,64px) 0 0;color:var(--rc-green)}
.h-src{font-size:13px;color:#8a8a90;margin-top:26px}
.h-src a{color:inherit}

/* word-by-word highlight */
.h-say-wrap{padding:clamp(80px,14vh,160px) var(--gut)}
.h-say,.h-grad-say{max-width:1100px;margin:0 auto;font-size:clamp(34px,5.4vw,78px);font-weight:780;letter-spacing:-.045em;line-height:1.05}
.h-say .w{color:#0b0b0c;opacity:.14;transition:opacity .35s}
.h-say .w.lit{opacity:1}

/* ---------- tabs ---------- */
.h-tabs{padding:20px 0 clamp(80px,12vh,140px);text-align:center}
.h-tabs-title{font-size:clamp(26px,3.2vw,44px);font-weight:760;letter-spacing:-.04em;margin:0 0 28px}
.h-tab-row{display:flex;justify-content:center;gap:12px;flex-wrap:wrap}
.h-tab{display:inline-flex;align-items:center;gap:12px;height:64px;padding:0 26px 0 10px;border-radius:999px;background:#f3f4f3;color:var(--rc-ink);font-size:19px;font-weight:700;letter-spacing:-.02em;text-decoration:none;transition:background .25s,transform .25s var(--rc-ease)}
.h-tab:hover{background:var(--rc-tint);transform:translateY(-2px)}
.h-mini{width:44px;height:44px;border-radius:13px;background:#0b0b0c;color:#fff;display:grid;place-items:center}
.h-mini svg{width:24px;height:24px}

/* ---------- dark app sections ---------- */
.h-dark{background:#000;color:#fff;padding:clamp(100px,16vh,180px) var(--gut) clamp(60px,10vh,120px);position:relative}
.h-dark-2{background:#000}
.h-app{display:flex;flex-direction:column;align-items:center;gap:clamp(28px,4vh,44px);text-align:center}
.h-tile{width:clamp(150px,22vw,264px);aspect-ratio:1;border-radius:22%;background:#fff;color:#000;display:grid;place-items:center;box-shadow:0 30px 80px -30px rgba(125,199,154,.45)}
.h-tile svg{width:42%;height:42%}
.h-app-name{font-size:clamp(84px,14vw,200px);font-weight:760;letter-spacing:-.06em;line-height:.9;margin:0}
.h-lead{text-align:center;font-size:clamp(22px,2.6vw,34px);font-weight:650;letter-spacing:-.03em;color:#cfd4d1;max-width:24ch;margin:clamp(28px,5vh,48px) auto 0}

/* sticky phone with steps scrolling past it */
.h-feature{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:clamp(24px,6vw,96px);max-width:1120px;margin:clamp(40px,8vh,90px) auto 0;align-items:start}
.h-steps{display:flex;flex-direction:column}
.h-step{min-height:88vh;display:flex;flex-direction:column;justify-content:center;opacity:.22;transform:translateY(16px);transition:opacity .5s,transform .6s var(--rc-ease)}
.h-step.on{opacity:1;transform:none}
.h-k{font-size:14px;font-weight:700;letter-spacing:.08em;color:var(--rc-mint)}
.h-step h3{font-size:clamp(34px,4.6vw,64px);font-weight:780;letter-spacing:-.045em;line-height:1;margin:14px 0 18px}
.h-step p{font-size:clamp(17px,1.5vw,21px);line-height:1.55;max-width:26em;margin:0;color:#b9bfbb}
.h-step-phone{display:none}
.h-fphone{position:sticky;top:calc(50vh - min(37vh,330px));height:fit-content}
.h-fphone .rc-phone{--pw:clamp(220px,min(24vw,34vh),330px) !important}
.h-light .h-k{color:var(--rc-green)}
.h-light .h-step p{color:#5e5e63}
.h-light .h-fphone .rc-phone{box-shadow:0 0 0 1.5px #2a2b2d inset,0 50px 90px -40px rgba(15,90,48,.5)}

.h-grad-say{margin-top:clamp(80px,14vh,160px);text-align:left}
.h-grad-say .w{background:linear-gradient(92deg,#9be3b4,#e9f8ee 50%,#7dc79a);-webkit-background-clip:text;background-clip:text;color:transparent;opacity:.18;transition:opacity .35s}
.h-grad-say .w.lit{opacity:1}
.h-grad-light .w{background:linear-gradient(92deg,#0f5a30,#1a7f45 50%,#3fae6e);-webkit-background-clip:text;background-clip:text}

/* food: bubble card + zoomed phone */
.h-card{max-width:1120px;margin:clamp(60px,10vh,110px) auto 0;background:#1c1d1c;border-radius:clamp(24px,3vw,44px);padding:clamp(56px,10vh,110px) var(--gut);text-align:center;box-shadow:inset 0 1px 0 rgba(255,255,255,.06)}
.h-bubbles{display:flex;justify-content:center}
.h-bubbles span{width:clamp(92px,11vw,132px);aspect-ratio:1;border-radius:50%;background:#fff;color:#000;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;font-weight:650;font-size:clamp(15px,1.4vw,19px);margin:0 -10px;box-shadow:0 18px 40px -16px rgba(0,0,0,.6),-6px 0 18px -8px rgba(0,0,0,.35)}
.h-bubbles i{display:block;width:28px;height:28px}
.h-bubbles i svg{width:100%;height:100%}
.h-card-say{font-size:clamp(28px,3.8vw,54px);font-weight:720;letter-spacing:-.045em;line-height:1.08;max-width:16ch;margin:clamp(40px,7vh,64px) auto 0}
.h-demo{--ph:min(76vh,720px);max-width:1040px;margin:clamp(60px,10vh,110px) auto 0;display:grid;grid-template-columns:minmax(0,1fr) auto;gap:clamp(32px,6vw,96px);align-items:center}
.h-demo-k{margin:0 0 18px;font-size:14px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--rc-mint)}
.h-demo-steps ol{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:6px}
.h-demo-steps li{padding:14px 18px;border-radius:18px;opacity:.35;transition:opacity .4s,background .4s}
.h-demo-steps li b{display:block;font-size:clamp(20px,2vw,26px);font-weight:760;letter-spacing:-.03em;color:#fff}
.h-demo-steps li span{display:block;margin-top:4px;font-size:16px;color:#b9bfbb}
.h-demo-steps li.on{opacity:1;background:#1c1d1c}
.h-demo-phone .rc-phone{--pw:calc(var(--ph) / 2.144)}
.h-demo-phone video{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:top;background:#f7f7f7}
@media (max-width:820px){
  .h-demo{grid-template-columns:1fr;gap:22px;justify-items:center}
  .h-demo-phone{grid-row:1}
  .h-demo-phone .rc-phone{--pw:min(64vw,280px)}
  .h-demo-steps{width:100%}
  .h-demo-k{display:none}
  .h-demo-steps li{display:none;text-align:center;padding:0;background:none !important}
  .h-demo-steps li.on{display:block}
}

/* patterns: expanding card */
.h-expand{height:175vh;background:#000;position:relative}
.h-expand .h-sticky{display:flex;align-items:center;justify-content:center}
.h-ex-card{position:absolute;top:50%;left:50%;overflow:hidden;background:#000}
.h-ex-card img{width:100%;height:100%;object-fit:cover;display:block}
.h-ex-m img{position:absolute;left:50%;top:50%;width:min(100vw,100vh,1024px);height:min(100vw,100vh,1024px);max-width:none;transform:translate(-50%,-50%);-webkit-mask-image:linear-gradient(90deg,transparent 0,#000 14%,#000 86%,transparent 100%);mask-image:linear-gradient(90deg,transparent 0,#000 14%,#000 86%,transparent 100%)}
.h-ex-m{--w:calc(min(30vw,380px) + (100vw - min(30vw,380px)) * var(--e,0));--h:calc(min(46vh,520px) + (100vh - min(46vh,520px)) * var(--e,0));width:var(--w);height:var(--h);transform:translate(-50%,-50%);border-radius:calc(32px * (1 - var(--e,0)));z-index:2}
.h-ex-l,.h-ex-r{width:min(26vw,330px);height:min(40vh,450px);border-radius:28px;opacity:calc(1 - var(--e,0) * 1.6)}
.h-ex-l{transform:translate(calc(-50% - min(30vw,380px) - var(--e,0) * 40vw),-50%)}
.h-ex-r{transform:translate(calc(-50% + min(30vw,380px) + var(--e,0) * 40vw),-50%)}
.h-ex-copy{position:absolute;inset:auto 0 0;padding:clamp(24px,6vw,80px);background:linear-gradient(transparent,rgba(0,0,0,.75));opacity:calc((var(--e,0) - .7) * 3.4)}
.h-ex-copy p{margin:0;color:#fff;font-size:clamp(34px,5.4vw,80px);font-weight:780;letter-spacing:-.05em;line-height:1;max-width:14ch}
@media (max-width:720px){.h-ex-copy{padding-bottom:120px}.h-ex-l,.h-ex-r{display:none}.h-ex-m{--w:calc(78vw + 22vw * var(--e,0));--h:calc(52vh + 48vh * var(--e,0))}}

.h-light{background:#fff;padding:clamp(60px,10vh,120px) var(--gut) clamp(80px,12vh,140px)}

/* guides */
.h-guides{padding:clamp(80px,12vh,140px) 0;background:#f6f8f6}
.h-guides-head{display:flex;justify-content:space-between;align-items:flex-end;gap:20px;flex-wrap:wrap;margin-bottom:34px}
.h-guides-head h2{font-size:clamp(32px,4.2vw,58px);font-weight:780;letter-spacing:-.045em;line-height:1.02;margin:6px 0 0;max-width:16ch}
.h-eyebrow{margin:0;font-size:14px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--rc-green)}

/* faq (reuses .qa from styles.css) */
.h-faq{padding:clamp(80px,12vh,140px) 0}
.h-faq-grid{display:grid;grid-template-columns:minmax(0,.8fr) minmax(0,1.2fr);gap:clamp(24px,5vw,80px);align-items:start}
.h-faq-grid h2{font-size:clamp(32px,4.2vw,58px);font-weight:780;letter-spacing:-.045em;line-height:1.02;margin:0}
@media (max-width:820px){.h-faq-grid{grid-template-columns:1fr}}

/* final */
.h-final{background:#000;color:#fff;padding:clamp(100px,18vh,200px) var(--gut);text-align:center;overflow:hidden;position:relative}
.h-final::before{content:"";position:absolute;left:50%;top:40%;width:min(110vw,1000px);aspect-ratio:1;transform:translate(-50%,-50%);background:radial-gradient(closest-side,rgba(26,127,69,.55),transparent 70%)}
.h-final-in{position:relative}
.h-final-icon{width:clamp(96px,12vw,140px);height:auto;border-radius:24%;box-shadow:0 30px 70px -20px rgba(125,199,154,.6)}
.h-final h2{font-size:clamp(40px,6.4vw,92px);font-weight:800;letter-spacing:-.055em;line-height:.98;max-width:13ch;margin:32px auto 0}
.h-final .h-cta{opacity:1;animation:none}
.h-final .h-free{color:#a9b0ac}

/* ---------- mobile ---------- */
@media (max-width:820px){
  .h-hero{height:190vh}
  .h-hero-copy{inset:96px var(--gut) auto}
  .h-hero-phone .rc-phone{--pw:min(62vw,38vh,300px) !important}
  /* phones: each step is a card (text + its own phone). Cards stick and stack; the one underneath shrinks and dims. */
  .h-feature{display:block}
  .h-fphone{display:none}
  .h-steps{display:block;padding-bottom:4vh}
  .h-step{--i:0;position:sticky;top:calc(88px + var(--i) * 14px);min-height:0;display:block;opacity:1;transform-origin:50% 0;
    margin:0 0 7vh;padding:24px 22px 0;border-radius:30px;overflow:hidden;background:#121413;
    border:1px solid rgba(255,255,255,.08);box-shadow:0 -18px 40px rgba(0,0,0,.45);will-change:transform}
  .h-step[data-i="1"]{--i:1}.h-step[data-i="2"]{--i:2}
  .h-step::after{content:"";position:absolute;inset:0;background:#000;opacity:var(--dim,0);pointer-events:none;border-radius:inherit}
  .h-light .h-step{background:#f4f6f4;border-color:rgba(11,11,12,.06);box-shadow:0 -14px 34px rgba(15,90,48,.14)}
  .h-light .h-step::after{background:#fff}
  .h-step h3{font-size:30px;margin:8px 0 8px}.h-step p{font-size:16px;line-height:1.5}
  .h-step-phone{display:flex;justify-content:center;margin-top:20px;height:min(58vh,440px);overflow:hidden}
  .h-step-phone .rc-phone{--pw:min(62vw,250px);box-shadow:0 30px 60px -30px rgba(0,0,0,.6)}
  .h-step.rv-card{transform:translate3d(0,48px,0) scale(.96);opacity:0;transition:transform .8s var(--rc-ease),opacity .8s var(--rc-ease)}
  .h-step.rv-card.in{transform:none;opacity:1}
  .h-grad-say{text-align:left}
}

/* ---------- reduced motion: show final states, no scrubbing ---------- */
.rm .rv{opacity:1;transform:none;transition:none}
.rm .h-hero{height:auto}
.rm .h-hero .h-sticky{position:relative;height:auto;padding-bottom:40px}
.rm .h-hero-copy{position:relative;inset:auto;padding-top:120px;transform:none;opacity:1}
.rm .h-hero-phone{position:relative;left:auto;transform:none;display:flex;justify-content:center;margin-top:40px}
.rm .h-hero-title span,.rm .h-hero-sub,.rm .h-cta{animation:none;opacity:1;transform:none}
.rm .h-marquee{position:absolute;top:50%;left:0;transform:translate3d(40vw,-50%,0);white-space:nowrap;font-size:clamp(110px,22vw,320px);font-weight:820;letter-spacing:-.06em;line-height:1;color:#1a7f45;opacity:0;pointer-events:none;will-change:transform,opacity}
.rm .h-say .w,.rm .h-grad-say .w{opacity:1}
.rm .h-step{opacity:1;transform:none}
.rm .h-expand{height:auto}
.rm .h-expand .h-sticky{position:relative;height:70vh}
.rm .h-ex-m{--e:1}
.rm .h-ex-copy{opacity:1}