/* RILEI applied intelligence system — crisp, scroll-led motion */
.ai-section{
  --ai-flow-progress:0;
  --ai-ambient-shift:0px;
  position:relative;
  isolation:isolate;
  overflow:clip;
  background:#090909;
}
.ai-section::before{
  content:"";
  position:absolute;
  z-index:0;
  inset:0;
  pointer-events:none;
  background:
    linear-gradient(rgba(255,255,255,.027) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.027) 1px,transparent 1px);
  background-size:64px 64px;
  mask-image:linear-gradient(90deg,transparent,rgba(0,0,0,.72) 30%,#000 100%);
}
.ai-section::after{
  content:"";
  position:absolute;
  z-index:0;
  width:620px;
  height:620px;
  right:-230px;
  top:16%;
  border-radius:50%;
  pointer-events:none;
  background:radial-gradient(circle,rgba(255,90,31,.19),rgba(255,90,31,.045) 38%,transparent 70%);
  transform:translate3d(0,var(--ai-ambient-shift),0);
  will-change:transform;
}
.ai-ambient{position:absolute;z-index:0;inset:0;pointer-events:none;overflow:hidden}
.ai-ambient span{position:absolute;border:1px solid rgba(255,90,31,.15);border-radius:50%;animation:ai-orbit 18s linear infinite}
.ai-ambient span:nth-child(1){width:360px;height:360px;right:-90px;top:12%}
.ai-ambient span:nth-child(2){width:520px;height:520px;right:-170px;top:10%;animation-duration:25s;animation-direction:reverse}
.ai-ambient span:nth-child(3){width:10px;height:10px;right:13%;top:29%;background:var(--orange);box-shadow:0 0 30px rgba(255,90,31,.8);animation-duration:9s}
@keyframes ai-orbit{to{transform:rotate(360deg)}}

.ai-system-layout{position:relative;z-index:1;display:grid;grid-template-columns:minmax(300px,.84fr) minmax(0,1.16fr);gap:clamp(54px,7vw,112px);align-items:start}
.ai-system-intro{position:sticky;top:128px;padding-bottom:22vh}
.ai-system-intro h2{max-width:680px;margin:0;font-size:clamp(48px,6vw,84px);line-height:.92;letter-spacing:-.068em;text-wrap:balance}
.ai-system-intro .lead{max-width:610px;margin:30px 0 0;color:rgba(255,255,255,.68);font-size:19px;line-height:1.62}
.ai-promise{display:flex;align-items:center;gap:15px;width:max-content;max-width:100%;margin-top:34px;padding:12px 19px 12px 12px;border:1px solid rgba(255,90,31,.46);border-radius:999px;background:rgba(255,90,31,.08)}
.ai-promise>span{display:grid;place-items:center;width:36px;height:36px;border-radius:50%;background:var(--orange);color:#fff;font-size:17px;font-weight:950}
.ai-promise p{margin:0;color:rgba(255,255,255,.72);font-size:12px;line-height:1.35;letter-spacing:.04em;text-transform:uppercase}
.ai-promise strong{color:#fff}

.ai-flow{position:relative;display:grid;gap:clamp(48px,6vw,76px);padding:4vh 0 7vh 44px}
.ai-service-bridge{margin-left:-44px;padding:20px 22px;border:1px solid rgba(255,255,255,.11);border-radius:19px;background:rgba(255,255,255,.035)}
.ai-service-bridge>p{margin:0 0 13px;color:var(--orange);font-size:9px;font-weight:900;letter-spacing:.18em;text-transform:uppercase}
.ai-service-bridge>div{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}
.ai-service-bridge span{display:flex;align-items:center;gap:9px;color:rgba(255,255,255,.72);font-size:11px;font-weight:760}
.ai-service-bridge b{display:grid;place-items:center;width:25px;height:25px;border-radius:50%;background:rgba(255,90,31,.13);color:var(--orange);font-size:8px;letter-spacing:.04em}
.ai-flow-rail{position:absolute;left:6px;top:calc(4vh + 116px);bottom:7vh;width:2px;background:rgba(255,255,255,.1)}
.ai-flow-rail span{display:block;width:100%;height:100%;background:linear-gradient(180deg,#ff8a4f,var(--orange));transform:scaleY(var(--ai-flow-progress));transform-origin:top;box-shadow:0 0 18px rgba(255,90,31,.7);will-change:transform}
.ai-flow-step{position:relative;min-height:205px;padding:31px;border:1px solid rgba(255,255,255,.1);border-radius:24px;background:linear-gradient(145deg,rgba(255,255,255,.058),rgba(255,255,255,.018));box-shadow:0 24px 60px rgba(0,0,0,.18);opacity:.58;transform:translate3d(12px,0,0) scale(.985);transition:opacity .45s ease,transform .55s var(--ease),border-color .45s ease,background-color .45s ease,box-shadow .45s ease}
.ai-flow-step::before{content:"";position:absolute;left:0;top:0;width:76%;height:1px;background:linear-gradient(90deg,rgba(255,90,31,.8),transparent);opacity:0;transition:opacity .4s ease}
.ai-flow-step.is-active{opacity:1;transform:translate3d(-8px,0,0) scale(1);border-color:rgba(255,90,31,.48);background:linear-gradient(145deg,rgba(255,90,31,.105),rgba(255,255,255,.025));box-shadow:0 30px 80px rgba(0,0,0,.38)}
.ai-flow-step.is-active::before{opacity:1}
.ai-step-node{position:absolute;left:-54px;top:30px;display:grid;place-items:center;width:32px;height:32px;border:1px solid rgba(255,255,255,.22);border-radius:50%;background:#0b0b0b;color:rgba(255,255,255,.45);font-size:9px;font-weight:900;letter-spacing:.05em;transition:color .35s ease,background-color .35s ease,border-color .35s ease,box-shadow .35s ease}
.ai-flow-step.is-active .ai-step-node{border-color:var(--orange);background:var(--orange);color:#fff;box-shadow:0 0 0 7px rgba(255,90,31,.1),0 0 28px rgba(255,90,31,.5)}
.ai-action-title{max-width:630px;margin:0;color:#fff;font-size:clamp(27px,3vw,43px);line-height:1.02;letter-spacing:-.052em;text-wrap:balance}
.ai-flow-step>p{max-width:650px;margin:22px 0 0;color:rgba(255,255,255,.62);font-size:15px;line-height:1.62}
.ai-principles-bar{display:flex;flex-wrap:wrap;gap:8px;margin-left:-44px;padding:24px 0 0;border-top:1px solid rgba(255,255,255,.13)}
.ai-principles-bar span{display:inline-flex;align-items:center;gap:8px;color:rgba(255,255,255,.58);font-size:9px;font-weight:850;letter-spacing:.11em;text-transform:uppercase}
.ai-principles-bar span::before{content:"";width:5px;height:5px;border-radius:50%;background:var(--orange)}
.ai-principles-bar span:not(:last-child)::after{content:"/";margin-left:8px;color:rgba(255,255,255,.18)}

@media(max-width:980px){
  .ai-system-layout{grid-template-columns:1fr;gap:30px}
  .ai-system-intro{position:relative;top:auto;padding-bottom:20px}
  .ai-system-intro h2{max-width:820px}
  .ai-system-intro .lead{max-width:760px}
  .ai-flow{padding-top:18px;padding-bottom:20px}
  .ai-flow-rail{top:134px;bottom:20px}
}
@media(max-width:620px){
  .ai-section::before{background-size:42px 42px}
  .ai-ambient span:nth-child(1){width:260px;height:260px}
  .ai-ambient span:nth-child(2){width:380px;height:380px}
  .ai-system-intro h2{font-size:clamp(42px,13vw,62px)}
  .ai-system-intro .lead{font-size:17px}
  .ai-flow{gap:36px;padding-left:29px}
  .ai-service-bridge{margin-left:-29px;padding:18px}
  .ai-service-bridge>div{grid-template-columns:1fr}
  .ai-flow-rail{left:3px;top:210px}
  .ai-flow-step{min-height:0;padding:24px 20px;border-radius:19px;opacity:.7;transform:none}
  .ai-flow-step.is-active{transform:translate3d(-3px,0,0)}
  .ai-step-node{left:-41px;top:24px;width:28px;height:28px}
  .ai-action-title{font-size:29px}
  .ai-principles-bar{margin-left:-29px;padding-left:0}
  .ai-principles-bar span:not(:last-child)::after{display:none}
}
@media(prefers-reduced-motion:reduce){
  .ai-section::after{transform:none}
  .ai-ambient span{animation:none}
  .ai-flow-rail span{transform:scaleY(1)}
  .ai-flow-step,.ai-flow-step.is-active{opacity:1;transform:none;transition:none}
  .ai-flow-step .ai-step-node{border-color:var(--orange);color:#fff}
}