/* =========================================================================
   NIKSUN — animated "How it works" pipeline (Infra → NKW → Intelligence → Olympus)
   Dark, scroll-driven. Used on home + platform. Scoped with .flow- prefix.
   ========================================================================= */
.flow-sec{background:linear-gradient(180deg,#0a2540 0%,#06182b 60%,#040f1c 100%);color:#fff;position:relative;overflow:hidden}
.flow-sec::before{content:'';position:absolute;left:50%;top:38%;transform:translateX(-50%);width:120%;height:60%;
  background:radial-gradient(closest-side,rgba(22,190,220,.10),transparent 70%);pointer-events:none}
.flow-head{text-align:center;max-width:680px;margin:0 auto 0}
.flow-head .eyebrow{justify-content:center;display:flex;color:var(--blue-bright)}
.flow-head h2{color:#fff}
.flow-head .lead{color:#AFC6DA;margin:16px auto 0}

.flow-diagram{max-width:940px;margin:54px auto 0;position:relative}

/* stage base — lit by scroll */
.flow-stage{opacity:.35;filter:saturate(.6);transition:opacity .7s var(--ease),filter .7s var(--ease),transform .7s var(--ease)}
.flow-stage.lit{opacity:1;filter:none}
@media(prefers-reduced-motion:reduce){.flow-stage{opacity:1;filter:none}}

/* ---- sources row ---- */
.flow-stage-label{font:500 11px/1 var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--blue-bright);text-align:center;margin-bottom:18px}
.flow-src-row{display:grid;grid-template-columns:repeat(6,1fr);gap:12px}
@media(max-width:760px){.flow-src-row{grid-template-columns:repeat(3,1fr)}}
.flow-src{display:flex;flex-direction:column;align-items:center;gap:9px;padding:16px 8px;border-radius:14px;
  background:rgba(255,255,255,.04);border:1px solid rgba(79,176,230,.22);transition:border-color .4s,background .4s,transform .4s var(--ease)}
.flow-sources.lit .flow-src{animation:flowPop .5s var(--ease) backwards}
.flow-sources.lit .flow-src:nth-child(2){animation-delay:.06s}
.flow-sources.lit .flow-src:nth-child(3){animation-delay:.12s}
.flow-sources.lit .flow-src:nth-child(4){animation-delay:.18s}
.flow-sources.lit .flow-src:nth-child(5){animation-delay:.24s}
.flow-sources.lit .flow-src:nth-child(6){animation-delay:.30s}
@keyframes flowPop{from{opacity:0;transform:translateY(-12px)}to{opacity:1;transform:none}}
.flow-src svg{width:22px;height:22px;color:var(--blue-bright)}
.flow-src span{font:600 11.5px/1.2 var(--sans);color:#C5D6E5;text-align:center}
@media(prefers-reduced-motion:reduce){.flow-sources.lit .flow-src{animation:none}}

/* ---- streams zone ---- */
.flow-streams{position:relative;height:130px;margin:6px 0;overflow:hidden}
.flow-streams .ln{position:absolute;top:-20%;width:1.5px;height:140%;
  background:linear-gradient(180deg,transparent,rgba(79,176,230,.55) 55%,var(--cyan));opacity:.5}
.flow-streams.run .ln{animation:flowFall 2.2s linear infinite}
@keyframes flowFall{0%{transform:translateY(-45%)}100%{transform:translateY(45%)}}
.flow-chip{position:absolute;top:0;font:500 10.5px/1 var(--mono);color:#0a2540;background:var(--blue-bright);
  padding:6px 10px;border-radius:999px;white-space:nowrap;box-shadow:0 4px 14px rgba(22,190,220,.4);opacity:0}
.flow-streams.run .flow-chip{animation:flowDrop 3.4s ease-in infinite}
@keyframes flowDrop{0%{transform:translateX(-50%) translateY(-12px);opacity:0}10%{opacity:1}80%{opacity:1}100%{transform:translateX(-50%) translateY(128px);opacity:0}}
@media(prefers-reduced-motion:reduce){.flow-streams .ln,.flow-streams .flow-chip{animation:none}.flow-streams .flow-chip{opacity:1;position:static;display:inline-block;margin:4px}}
.flow-streams.reduced{height:auto;text-align:center;padding:10px 0}

/* ---- NKW lake ---- */
.flow-lake{position:relative;border-radius:18px;padding:26px 28px;display:flex;align-items:center;gap:20px;
  background:linear-gradient(120deg,rgba(22,190,220,.16),rgba(46,151,215,.08));border:1px solid rgba(22,190,220,.4);overflow:hidden}
.flow-lake::before{content:'';position:absolute;left:50%;top:-60%;transform:translateX(-50%);width:70%;height:160%;
  background:radial-gradient(closest-side,rgba(22,190,220,.45),transparent 70%);opacity:0;transition:opacity .8s}
.flow-lake.lit::before{opacity:1;animation:flowBreathe 4s ease-in-out infinite}
@keyframes flowBreathe{0%,100%{opacity:.55}50%{opacity:1}}
@media(prefers-reduced-motion:reduce){.flow-lake.lit::before{animation:none;opacity:.7}}
.flow-lake .orb{flex:none;width:62px;height:62px;border-radius:50%;background:radial-gradient(circle at 40% 35%,var(--cyan),var(--blue) 72%);
  display:grid;place-items:center;box-shadow:0 0 34px rgba(22,190,220,.6);position:relative}
.flow-lake .orb img{width:54%;filter:brightness(0) invert(1)}
.flow-lake .tx{position:relative}
.flow-lake .tx b{display:block;font-size:19px;font-weight:800;letter-spacing:-.02em;color:#fff}
.flow-lake .tx span{font-size:13.5px;color:#AFC6DA}

/* ---- connector arrow ---- */
.flow-arrow{display:flex;justify-content:center;align-items:center;height:46px;position:relative}
.flow-arrow::after{content:'';width:1.5px;height:0;background:linear-gradient(180deg,var(--cyan),var(--blue-bright));transition:height .6s var(--ease)}
.flow-arrow.lit::after{height:46px}
.flow-arrow .tip{position:absolute;bottom:4px;width:8px;height:8px;border-right:1.5px solid var(--blue-bright);border-bottom:1.5px solid var(--blue-bright);
  transform:rotate(45deg);opacity:0;transition:opacity .4s .4s}
.flow-arrow.lit .tip{opacity:1}
@media(prefers-reduced-motion:reduce){.flow-arrow::after{height:46px}.flow-arrow .tip{opacity:1}}

/* ---- intelligence band ---- */
.flow-intel{border-radius:16px;padding:24px 26px;background:rgba(255,255,255,.05);border:1px solid rgba(79,176,230,.26);text-align:center}
.flow-intel .k{font:500 11px/1 var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--blue-bright);margin-bottom:6px}
.flow-intel b{font-size:18px;font-weight:700;letter-spacing:-.01em}
.flow-intel .flow-tags{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-top:16px}
.flow-intel .flow-tags span{font:500 11.5px/1 var(--mono);color:#C5D6E5;background:rgba(255,255,255,.05);
  border:1px solid rgba(255,255,255,.14);padding:8px 12px;border-radius:8px;transition:.4s}
.flow-intel.lit .flow-tags span{animation:flowPop .5s var(--ease) backwards}
.flow-intel.lit .flow-tags span:nth-child(2){animation-delay:.05s}
.flow-intel.lit .flow-tags span:nth-child(3){animation-delay:.1s}
.flow-intel.lit .flow-tags span:nth-child(4){animation-delay:.15s}
.flow-intel.lit .flow-tags span:nth-child(5){animation-delay:.2s}
.flow-intel.lit .flow-tags span:nth-child(6){animation-delay:.25s}
.flow-intel.lit .flow-tags span:nth-child(7){animation-delay:.3s}
.flow-intel.lit .flow-tags span:nth-child(8){animation-delay:.35s}
@media(prefers-reduced-motion:reduce){.flow-intel.lit .flow-tags span{animation:none}}

/* ---- Olympus answer ---- */
.flow-olympus{border-radius:18px;padding:26px 28px;background:linear-gradient(120deg,#0b3a52,#0a2540);border:1px solid rgba(22,190,220,.32);
  display:flex;align-items:center;gap:22px;flex-wrap:wrap}
.flow-olympus .badge{flex:none;font:700 13px/1 var(--mono);letter-spacing:.02em;color:#0a2540;background:var(--blue-bright);padding:9px 13px;border-radius:9px}
.flow-olympus .tx{flex:1;min-width:240px}
.flow-olympus .tx b{display:block;font-size:18px;font-weight:800;letter-spacing:-.02em;color:#fff;margin-bottom:5px}
.flow-olympus .tx span{font-size:13.5px;color:#AFC6DA}
.flow-olympus .ws{display:flex;gap:7px;flex-wrap:wrap;margin-top:12px}
.flow-olympus .ws i{font:700 11px/1 var(--mono);font-style:normal;color:var(--blue-bright);background:rgba(22,190,220,.12);
  border:1px solid rgba(22,190,220,.3);padding:6px 10px;border-radius:7px}