/* ============================================================
   THREE SYSTEMS. ONE BUILDER. — company chapter experiences
   StudAI One (WebGL growth engine) · NexArc (CSS-3D founder city)
   · theTN.ai (ceramic living map) · connecting bridges
   ============================================================ */

/* ------------------------------------------------------------
   SHARED CHAPTER PRIMITIVES
------------------------------------------------------------ */
.eyebrow {
  font: 600 var(--fs-tiny)/1.5 var(--sans); letter-spacing: .16em;
  text-transform: uppercase; color: var(--slate); margin-bottom: 1.1rem;
}
.eyebrow--green { color: var(--green); }
.eyebrow--amber { color: var(--amber); }
.eyebrow--sky   { color: var(--sky); }

.co__head { margin-bottom: clamp(2.2rem, 4.5vw, 3.6rem); }
.answer-first {
  margin-top: 1.2rem; max-width: 62ch;
  font-size: 1.125rem; line-height: 1.6; color: var(--ink-2);
}

.co__grid {
  display: grid; grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  gap: clamp(1.8rem, 4vw, 3.6rem); align-items: center;
  margin-top: clamp(2.4rem, 5vw, 4rem);
}
.co__grid--flip .co__figure { order: 2; }
.co__figure { margin: 0; }
.co__figure img {
  border-radius: 24px; width: 100%; height: auto;
  box-shadow: 0 28px 56px -34px rgba(20, 33, 60, .35);
}
.co__figure figcaption { margin-top: .7rem; font: 500 .8125rem/1.5 var(--sans); color: var(--slate); }
.co__figure--wide { max-width: 980px; margin: clamp(2.4rem, 5vw, 4rem) auto 0; }

.entity-facts { margin: 0; display: grid; gap: 0; border-top: 1px solid var(--border-2); }
.entity-facts div {
  display: grid; grid-template-columns: 9.5rem 1fr; gap: 1rem;
  padding: .65rem .2rem; border-bottom: 1px solid var(--border);
}
.entity-facts dt { font: 600 .78rem/1.6 var(--sans); letter-spacing: .08em; text-transform: uppercase; color: var(--slate); }
.entity-facts dd { margin: 0; font: 500 .9375rem/1.5 var(--sans); color: var(--ink); }
.entity-facts--compact div { padding: .5rem .2rem; }

.founder-perspective {
  margin: 1.6rem 0 0; border-left: 3px solid var(--green);
  background: var(--paper); border-radius: 0 18px 18px 0;
  padding: 1.2rem 1.4rem;
}
.founder-perspective p { font: 500 1.08rem/1.55 var(--serif); font-style: italic; color: var(--ink-2); }
.founder-perspective cite { display: block; margin-top: .7rem; font: 600 .8125rem/1 var(--sans); font-style: normal; color: var(--slate); }
.founder-perspective--amber { border-color: var(--amber); }

.co__ctas { margin-top: 1.6rem; display: flex; flex-wrap: wrap; gap: .8rem; }

/* ------------------------------------------------------------
   BRIDGES — the ribbon transforms between systems
------------------------------------------------------------ */
.bridge { position: relative; height: 150px; max-width: var(--shell); margin-inline: auto; padding-inline: clamp(1.25rem, 4vw, 3rem); }
.bridge svg { width: 100%; height: 100%; display: block; }
.bridge path { stroke-width: 2; stroke-linecap: round; }
.bridge__stem { stroke: var(--green); }
.bridge--a .bridge__fan { stroke: var(--amber); opacity: .75; }
.bridge--b .bridge__fan { stroke: var(--sky); opacity: .75; }
.bridge--b .bridge__fan:nth-child(-n+2) { stroke: var(--amber); }
.js .bridge path { stroke-dasharray: 100; stroke-dashoffset: 100; transition: stroke-dashoffset 1.4s var(--ease); }
.js .bridge path:nth-child(2) { transition-delay: .12s; }
.js .bridge path:nth-child(3) { transition-delay: .2s; }
.js .bridge path:nth-child(4) { transition-delay: .28s; }
.js .bridge path:nth-child(5) { transition-delay: .36s; }
.js .bridge path:nth-child(6) { transition-delay: .44s; }
.js .bridge.is-in path { stroke-dashoffset: 0; }
.bridge__line {
  position: absolute; left: 50%; bottom: -4px; transform: translateX(-50%);
  font: 500 .9rem/1 var(--serif); color: var(--slate); white-space: nowrap;
}
.bridge__line em { font-style: italic; color: var(--ink); }

/* ------------------------------------------------------------
   GE · THE HUMAN GROWTH ENGINE  (StudAI One)
------------------------------------------------------------ */
.co--studai {
  background:
    radial-gradient(44rem 26rem at 92% 8%, var(--green-soft) 0%, transparent 55%),
    var(--bg);
}
.ge {
  display: grid; grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  gap: clamp(1.6rem, 4vw, 3rem); align-items: center;
  border: 1px solid var(--border); border-radius: 30px;
  background: linear-gradient(160deg, #fff 55%, var(--ivory));
  padding: clamp(1.4rem, 3vw, 2.4rem);
  /* stage accent */
  --acc: #2f93c8; --acc-soft: var(--sky-soft);
}
.ge[data-stage="learn"] { --acc: #2f93c8;      --acc-soft: var(--sky-soft); }
.ge[data-stage="prove"] { --acc: var(--gold);  --acc-soft: var(--gold-soft); }
.ge[data-stage="win"]   { --acc: var(--coral); --acc-soft: var(--coral-soft); }
.ge[data-stage="grow"]  { --acc: var(--green); --acc-soft: var(--green-soft); }

.ge__stage { position: relative; aspect-ratio: 1; max-height: 560px; overflow: hidden; border-radius: 20px; }
.ge__canvas { position: absolute; inset: 0; width: 100%; height: 100%; opacity: 0; transition: opacity .8s var(--ease); }
.ge.has-webgl .ge__canvas { opacity: 1; }
.ge__hint {
  position: absolute; bottom: .4rem; left: 50%; transform: translateX(-50%);
  font: 500 .78rem/1 var(--sans); color: var(--slate); white-space: nowrap;
}

/* CSS fallback sculpture — architectural ring stack */
.ge__fallback { position: absolute; inset: 0; display: grid; place-content: center; perspective: 900px; }
.ge.has-webgl .ge__fallback { display: none; }
.ge__ring {
  position: absolute; left: 50%; top: 50%; border-radius: 50%;
  border: 3px solid; transform-style: preserve-3d;
  background: rgba(255, 255, 255, .25);
}
.ge__ring--learn { width: 260px; height: 260px; border-color: #7cc7f0; margin: -130px; transform: rotateX(68deg) translateZ(84px); }
.ge__ring--prove { width: 300px; height: 300px; border-color: #e0b566; margin: -150px; transform: rotateX(68deg) translateZ(28px); }
.ge__ring--win   { width: 340px; height: 340px; border-color: #e58a70; margin: -170px; transform: rotateX(68deg) translateZ(-28px); }
.ge__ring--grow  { width: 380px; height: 380px; border-color: #63bf95; margin: -190px; transform: rotateX(68deg) translateZ(-84px); }
.js .ge__fallback .ge__ring { animation: ringFloat 7s var(--ease) infinite alternate; }
.js .ge__fallback .ge__ring--prove { animation-delay: .6s; }
.js .ge__fallback .ge__ring--win { animation-delay: 1.2s; }
.js .ge__fallback .ge__ring--grow { animation-delay: 1.8s; }
@keyframes ringFloat { to { transform: rotateX(68deg) translateZ(calc(var(--tz, 0px))) translateY(-8px); } }
.ge__ring--learn { --tz: 84px; } .ge__ring--prove { --tz: 28px; }
.ge__ring--win { --tz: -28px; } .ge__ring--grow { --tz: -84px; }
.ge__core {
  position: relative; z-index: 1; width: 84px; height: 84px; border-radius: 50%;
  display: grid; place-content: center; background: #fff;
  border: 1.5px solid var(--green); color: var(--green);
  font: 600 1.15rem/1 var(--serif);
  box-shadow: 0 18px 38px -20px rgba(14, 138, 95, .5);
}

/* Stage stepper + scenes */
.ge__steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: .5rem; margin-bottom: 1.4rem; }
.ge__step {
  border: 1.5px solid var(--border-2); background: #fff; border-radius: 16px;
  padding: .7rem .5rem .6rem; display: grid; gap: .2rem; justify-items: center;
  transition: all .25s var(--ease);
}
.ge__step-num { font: 500 .72rem/1 var(--serif); color: var(--slate); }
.ge__step-label { font: 600 .9rem/1 var(--sans); color: var(--ink-2); }
.ge__step:hover { border-color: var(--ink); }
.ge__step.is-on { border-color: var(--acc); background: var(--acc-soft); }
.ge__step.is-on .ge__step-label { color: var(--ink); }
.ge__step.is-on .ge__step-num { color: var(--acc); }

.ge__scene { display: none; }
.ge__scene.is-on { display: block; }
.js .ge__scene.is-on { animation: geIn .45s var(--ease); }
@keyframes geIn { from { opacity: 0; transform: translateY(12px); } }
.ge__scene-line { font: 500 1.15rem/1.4 var(--serif); color: var(--ink-2); }
.ge__products { list-style: none; margin: 1.1rem 0 0; padding: 0; display: grid; gap: .55rem; }
.ge__products li {
  display: grid; grid-template-columns: 7.2rem 1fr; gap: .9rem; align-items: baseline;
  border-left: 3px solid var(--acc); background: #fff;
  border-radius: 0 12px 12px 0; padding: .75rem 1rem;
  transition: border-color .4s;
}
.js .ge__scene.is-on .ge__products li { animation: prodSlide .5s var(--ease) both; }
.js .ge__scene.is-on .ge__products li:nth-child(2) { animation-delay: .09s; }
.js .ge__scene.is-on .ge__products li:nth-child(3) { animation-delay: .18s; }
@keyframes prodSlide { from { opacity: 0; transform: translateX(-14px); } }
.ge__products strong { font: 600 .93rem/1.3 var(--sans); }
.ge__products span { color: var(--slate); font-size: .875rem; }

/* ------------------------------------------------------------
   NX · THE FOUNDER NETWORK IN MOTION  (NexArc)
------------------------------------------------------------ */
.co--nexarc { background: var(--ivory); }
.nx {
  display: grid; grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  gap: clamp(1.6rem, 4vw, 3rem); align-items: center;
}
.nx__city-wrap { position: relative; }
.nx__city {
  position: relative; aspect-ratio: 10/9; max-height: 540px;
  perspective: 1100px;
}
.nx__platform {
  position: absolute; left: 50%; top: 55%; width: 74%; aspect-ratio: 1;
  transform: translate(-50%, -50%) rotateX(62deg) rotateZ(45deg);
  background: linear-gradient(135deg, #fff, var(--ivory));
  border: 1px solid var(--border-2); border-radius: 26px;
  box-shadow: 0 40px 70px -40px rgba(20, 33, 60, .4), inset 0 0 0 12px rgba(255, 255, 255, .5);
}
.nx__paths { position: absolute; inset: 0; width: 100%; height: 100%; }
.nx__path { stroke: var(--border-2); stroke-width: .5; stroke-dasharray: 2 3; transition: stroke .35s, opacity .35s; opacity: .8; }
.nx__path.is-on { stroke: var(--amber); stroke-dasharray: 100; stroke-width: .8; opacity: 1; }

.nx__tower {
  position: absolute; left: var(--x); top: var(--y);
  transform: translate(-50%, -88%);
  display: grid; justify-items: center; gap: .35rem;
  transition: transform .5s var(--spring), opacity .4s;
}
.nx__block { display: grid; gap: 2px; }
.nx__block i {
  display: block; width: 34px; border-radius: 5px;
  height: calc(var(--h, 3) * 7px);
  background: linear-gradient(180deg, rgba(255,255,255,.9), rgba(232,226,214,.75));
  border: 1px solid var(--border-2);
  box-shadow: 0 10px 20px -12px rgba(20, 33, 60, .35);
  transition: background .35s, border-color .35s, height .5s var(--spring);
}
.nx__block i:nth-child(2) { width: 28px; height: calc(var(--h, 3) * 5px); margin-inline: auto; }
.nx__block i:nth-child(3) { width: 20px; height: calc(var(--h, 3) * 4px); margin-inline: auto; }
.nx__label {
  font: 600 .72rem/1 var(--sans); letter-spacing: .08em; text-transform: uppercase;
  color: var(--slate); background: rgba(255,255,255,.85);
  border: 1px solid var(--border); border-radius: 999px; padding: .3rem .6rem;
  transition: color .3s, border-color .3s;
}
/* role states */
.nx__tower.is-dim { opacity: .3; transform: translate(-50%, -88%) scale(.92); }
.nx__tower.is-link { opacity: 1; }
.nx__tower.is-on { transform: translate(-50%, -88%) translateY(-10px) scale(1.12); z-index: 2; }
.nx__tower.is-on .nx__block i { background: linear-gradient(180deg, #fff, var(--amber-soft)); border-color: var(--amber); }
.nx__tower.is-on .nx__label { color: var(--amber); border-color: var(--amber); }
.nx__hint {
  margin-top: .4rem; text-align: center;
  font: 500 .78rem/1 var(--sans); color: var(--slate);
}

.nx__roles { display: flex; flex-wrap: wrap; gap: .45rem; margin-bottom: 1.3rem; }
.nx__role {
  border: 1.5px solid var(--border-2); background: #fff; border-radius: 999px;
  padding: .55rem 1rem; font: 600 .84rem/1 var(--sans); color: var(--ink-2);
  transition: all .25s var(--ease);
}
.nx__role:hover { border-color: var(--ink); color: var(--ink); }
.nx__role.is-on { background: var(--ink); border-color: var(--ink); color: #fff; }

.nx__view { display: none; }
.nx__view.is-on { display: block; }
.js .nx__view.is-on { animation: geIn .4s var(--ease); }
.nx__view-name { font: 500 1.45rem/1.2 var(--serif); }
.nx__view-what { margin-top: .5rem; color: var(--ink-2); }
.nx__view-links { margin-top: .9rem; font: 500 .84rem/1.8 var(--sans); color: var(--slate); }
.nx__view-links span {
  display: inline-block; margin-left: .35rem; padding: .25rem .6rem;
  border: 1px solid var(--border-2); border-radius: 999px; font-weight: 600; color: var(--ink-2);
}
.nx__orin {
  margin-top: 1.4rem; padding-top: 1.1rem; border-top: 1px solid var(--border-2);
  font-size: .9375rem; color: var(--slate);
}
.nx__orin strong { color: var(--amber); }

/* ------------------------------------------------------------
   TN · THE LIVING MAP  (theTN.ai)
------------------------------------------------------------ */
.co--thetn {
  background:
    radial-gradient(46rem 28rem at 6% 24%, var(--sky-soft) 0%, transparent 58%),
    var(--bg);
}
.tn {
  display: grid; grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  gap: clamp(1.6rem, 4vw, 3rem); align-items: center;
}
.tn__map { width: 100%; max-width: 560px; margin-inline: auto; display: block; }
.tn__layer { stroke: none; }
.tn__layer--3 { fill: #c4d8e8; }
.tn__layer--2 { fill: #dcebf5; }
.tn__land { fill: #fbfdff; stroke: var(--sky-deep); stroke-width: 1.8; stroke-linejoin: round; }
.js .tn__land { stroke-dasharray: 100; stroke-dashoffset: 100; transition: stroke-dashoffset 2.2s var(--ease); }
.js .tn.is-in .tn__land { stroke-dashoffset: 0; }
.js .tn__layer { opacity: 0; transition: opacity 1s var(--ease) .9s; }
.js .tn.is-in .tn__layer { opacity: 1; }

.tn__chennai-dot { fill: var(--sky-deep); }
.tn__chennai-halo { fill: none; stroke: var(--sky); stroke-width: 1.4; opacity: .7; }
.js .tn__chennai-halo { transform-box: fill-box; transform-origin: center; animation: halo 2.8s var(--ease) infinite; }
@keyframes halo { 0% { transform: scale(.6); opacity: .8; } 100% { transform: scale(1.5); opacity: 0; } }
.tn__label { font: 600 .76rem var(--sans); letter-spacing: .04em; fill: var(--sky-deep); }
.tn__label--world { fill: var(--slate); }

.tn__beacon { cursor: pointer; }
.tn__beacon circle { fill: var(--border-2); transition: fill .3s, r .3s; }
.tn__beacon text { font: 600 .72rem var(--sans); fill: var(--slate); transition: fill .3s; }
.tn__beacon.is-on circle { fill: var(--sky); }
.tn__beacon.is-on text { fill: var(--sky-deep); }
.tn__net { stroke: var(--sky); stroke-width: 1.1; stroke-dasharray: 2 5; opacity: .6; }

.tn__world { stroke: var(--sky-deep); stroke-width: 1.8; stroke-linecap: round; }
.js .tn__world { stroke-dasharray: 100; stroke-dashoffset: 100; transition: stroke-dashoffset 1.4s var(--ease) 1.6s; }
.js .tn.is-in .tn__world { stroke-dashoffset: 0; }
.js .tn__label--world { opacity: 0; transition: opacity .8s var(--ease) 2.6s; }
.js .tn.is-in .tn__label--world { opacity: 1; }
.tn__cap { margin-top: .6rem; text-align: center; font: 500 1.02rem/1.4 var(--serif); font-style: italic; color: var(--slate); }

.tn__themes { display: grid; gap: .55rem; margin-bottom: 1.4rem; }
.tn__theme {
  text-align: left; border: 1px solid var(--border); border-radius: 16px;
  background: #fff; padding: .9rem 1.1rem; display: grid; gap: .2rem;
  transition: border-color .25s, transform .3s var(--spring);
}
.tn__theme:hover { transform: translateX(4px); }
.tn__theme.is-on { border-color: var(--sky); background: linear-gradient(120deg, #fff 70%, var(--sky-soft)); }
.tn__theme-name { font: 600 .975rem/1.2 var(--sans); }
.tn__theme.is-on .tn__theme-name { color: var(--sky-deep); }
.tn__theme-what { color: var(--slate); font-size: .875rem; }
.tn__belief { font: 500 1.05rem/1.5 var(--serif); font-style: italic; color: var(--ink-2); }
.tn__belief cite { display: block; margin-top: .4rem; font: 600 .8125rem/1 var(--sans); font-style: normal; color: var(--slate); }
.tn .entity-facts { margin-top: 1.3rem; }

/* ------------------------------------------------------------
   VENTURE ENTITY PAGES — /ventures/*
------------------------------------------------------------ */
.venture { padding: 7rem 0 4.5rem; }
.venture__crumbs { font: 500 .84rem/1 var(--sans); color: var(--slate); margin-bottom: 2rem; }
.venture__crumbs a { color: var(--slate); text-decoration: none; }
.venture__crumbs a:hover { color: var(--ink); text-decoration: underline; }
.venture__crumbs span[aria-current] { color: var(--ink); font-weight: 600; }
.venture__head { margin-bottom: 2.2rem; }
.venture__title { font: 500 clamp(1.9rem, 4.5vw, 3rem)/1.12 var(--serif); letter-spacing: -.01em; }
.venture__figure { margin: 0 0 2rem; }
.venture__figure img { border-radius: 22px; width: 100%; height: auto; box-shadow: 0 28px 56px -34px rgba(20,33,60,.35); }
.venture .entity-facts { margin-bottom: 2.4rem; }
.venture__why h2, .venture__faq h2 { font: 500 1.6rem/1.2 var(--serif); margin-bottom: 1rem; }
.venture__why { margin-bottom: 2.4rem; }
.venture__context { margin-top: 1.2rem; color: var(--ink-2); }
.venture__context a { color: var(--royal); text-underline-offset: 3px; }
.venture__faq { margin-bottom: 2.4rem; }
.venture__qa { border: 1px solid var(--border); border-radius: 14px; background: #fff; margin-bottom: .6rem; }
.venture__qa summary {
  list-style: none; cursor: pointer; padding: .95rem 1.2rem;
  font: 600 .975rem/1.4 var(--sans);
}
.venture__qa summary::-webkit-details-marker { display: none; }
.venture__qa summary::after { content: "+"; float: right; color: var(--slate); }
.venture__qa[open] summary::after { content: "−"; }
.venture__qa p { padding: 0 1.2rem 1rem; color: var(--ink-2); font-size: .9375rem; }
.venture__ctas { display: flex; flex-wrap: wrap; gap: .8rem; margin-bottom: 2rem; }
.venture__updated { font: 500 .8125rem/1.6 var(--sans); color: var(--slate); border-top: 1px solid var(--border); padding-top: 1.2rem; }
.venture-page .nav { position: sticky; top: 0; }

/* ------------------------------------------------------------
   RESPONSIVE
------------------------------------------------------------ */
@media (max-width: 1020px) {
  .ge, .nx, .tn, .co__grid { grid-template-columns: 1fr; }
  .co__grid--flip .co__figure { order: 0; }
  .ge__stage { max-height: 420px; }
  .nx__city { max-height: 420px; }
}

@media (max-width: 640px) {
  .ge { padding: 1.1rem; }
  .ge__stage { aspect-ratio: 5/4; }
  .ge__fallback { transform: scale(.68); }
  .ge__steps { grid-template-columns: repeat(4, 1fr); gap: .35rem; }
  .ge__step { padding: .55rem .3rem .5rem; border-radius: 12px; }
  .ge__step-label { font-size: .78rem; }
  .ge__products li { grid-template-columns: 1fr; gap: .2rem; }
  .nx__city { aspect-ratio: 1; }
  .nx__block i { width: 26px; }
  .nx__block i:nth-child(2) { width: 21px; }
  .nx__block i:nth-child(3) { width: 15px; }
  .bridge { height: 110px; }
  .bridge__line { font-size: .8rem; }
  .entity-facts div { grid-template-columns: 1fr; gap: .15rem; }
}

/* ------------------------------------------------------------
   REDUCED MOTION
------------------------------------------------------------ */
@media (prefers-reduced-motion: reduce) {
  .js .bridge path, .js .tn__land, .js .tn__world, .js .tn__layer, .js .tn__label--world {
    stroke-dashoffset: 0 !important; opacity: 1 !important;
    transition: none !important;
  }
  .ge__canvas { display: none; }
  .ge.has-webgl .ge__fallback { display: grid; }
  .js .ge__fallback .ge__ring { animation: none; }
  .tn__chennai-halo { animation: none; }
}