:root{
  --ink:#0b0b0c;
  --ink-soft:#3a3a3e;
  --muted:#71717a;
  --line:#e7e7e4;
  --bg:#ffffff;
  --tint:#f7f7f4;
  --dark:#0b0b0c;
  --accent:#1f9d4e;            /* jungle green accent (matches the headline) */
  --max:720px;
  --serif:"Newsreader",Georgia,serif;
  --sans:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Helvetica,Arial,sans-serif;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--sans);
  color:var(--ink);
  background:var(--bg);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
a{color:inherit;text-decoration:none}

.container{width:100%;max-width:1080px;margin:0 auto;padding:0 24px}
.container.narrow{max-width:var(--max)}

/* ---------- NAV ---------- */
.nav{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.82);
  backdrop-filter:saturate(180%) blur(12px);
  border-bottom:1px solid transparent;
  transition:border-color .3s ease, background .3s ease;
}
.nav.scrolled{border-bottom-color:var(--line)}
.nav-inner{
  max-width:1080px;margin:0 auto;padding:14px 24px;
  display:flex;align-items:center;justify-content:space-between;gap:24px;
}
.brand{display:flex;align-items:center;gap:9px;font-weight:600;letter-spacing:-.01em}
.brand-mark{width:18px;height:18px;display:inline-block;vertical-align:middle;flex:0 0 18px}
.brand-name{font-size:17px}
.nav-links{display:flex;gap:28px}
.nav-links a{font-size:14.5px;color:var(--ink-soft);transition:color .2s}
.nav-links a:hover{color:var(--ink)}
.nav-cta{display:flex;align-items:center;gap:18px}
.link-muted{font-size:14.5px;color:var(--muted)}
.link-muted:hover{color:var(--ink)}

/* ---------- BUTTONS ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  font-size:14.5px;font-weight:500;padding:10px 18px;border-radius:999px;
  border:1px solid transparent;cursor:pointer;transition:transform .15s ease, background .2s ease, opacity .2s;
  white-space:nowrap;
}
.btn:active{transform:translateY(1px)}
.btn-dark{background:var(--ink);color:#fff}
.btn-dark:hover{opacity:.88}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{border-color:var(--ink)}

/* ---------- HERO ---------- */
.hero{padding:96px 0 64px}
.eyebrow{
  font-size:13px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;
  color:var(--ink);margin-bottom:22px;
}
.hero h1{
  font-family:var(--serif);
  font-weight:500;
  font-size:clamp(34px,5.4vw,56px);
  line-height:1.08;letter-spacing:-.02em;
  margin-bottom:26px;
}
/* ---------- JUNGLE PHRASE ---------- */
.jungle{position:relative;display:inline-block;white-space:nowrap;padding:0 .15em}
.jungle-text{
  background:linear-gradient(100deg,#39d353 0%,#1f9d4e 38%,#46e07e 60%,#0f7a3a 100%);
  -webkit-background-clip:text;background-clip:text;color:transparent;
  font-style:italic;
  filter:drop-shadow(0 2px 10px rgba(34,160,75,.35));
}
.jungle .leaf{
  position:absolute;width:26px;height:26px;pointer-events:none;
  transform-origin:bottom center;animation:sway 5s ease-in-out infinite;
}
.jungle .leaf path{fill:#2fae57}
.jungle .leaf .vein{fill:none;stroke:#0e5e30;stroke-width:.9;opacity:.5}
.jungle .leaf-1{top:-20px;left:-14px;transform:rotate(-42deg);width:30px;height:30px;animation-delay:0s}
.jungle .leaf-1 path{fill:#37c463}
.jungle .leaf-2{top:-24px;right:34%;transform:rotate(18deg);width:22px;height:22px;animation-delay:.8s}
.jungle .leaf-2 path{fill:#2a9b4e}
.jungle .leaf-3{top:-16px;right:-10px;transform:rotate(46deg);width:27px;height:27px;animation-delay:1.6s}
.jungle .leaf-3 path{fill:#45d977}
.jungle .leaf-4{bottom:-18px;left:24%;transform:rotate(168deg);width:20px;height:20px;animation-delay:1.1s}
.jungle .leaf-4 path{fill:#1f8f49}
.jungle .vine{
  position:absolute;top:-22px;left:-6px;width:calc(100% + 12px);height:34px;
  pointer-events:none;overflow:visible;
}
.jungle .vine path{fill:none;stroke:#1f9d4e;stroke-width:2.4;stroke-linecap:round;opacity:.7}
@keyframes sway{
  0%,100%{transform:rotate(var(--r,0deg)) translateY(0)}
  50%{transform:rotate(calc(var(--r,0deg) + 6deg)) translateY(-2px)}
}
.jungle .leaf-1{--r:-42deg}
.jungle .leaf-2{--r:18deg}
.jungle .leaf-3{--r:46deg}
.jungle .leaf-4{--r:168deg}
@media (prefers-reduced-motion:reduce){.jungle .leaf{animation:none}}

.lede{font-size:19px;color:var(--ink-soft);max-width:640px;margin-bottom:28px}
.thesis{
  background:var(--tint);border-left:3px solid var(--accent);
  border-radius:4px 14px 14px 4px;padding:24px 28px;
  margin-bottom:34px;max-width:600px;
}
.thesis blockquote{
  font-family:var(--serif);font-size:20px;font-style:italic;
  color:var(--ink);line-height:1.4;margin-bottom:16px;
}
.thesis-author{display:flex;align-items:center;gap:11px}
.thesis-avatar{width:40px;height:40px;border-radius:50%;object-fit:cover;flex:0 0 40px;border:1px solid var(--line)}
.thesis-meta{display:flex;flex-direction:column;line-height:1.32}
.thesis-name{font-weight:600;font-size:14px;color:var(--ink)}
.thesis-role{font-size:12.5px;color:var(--muted);display:flex;align-items:center;gap:4px;flex-wrap:wrap}
.thesis-role .oai-logo{height:13px;width:auto;display:inline-block;vertical-align:middle}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:40px}
.byline{display:flex;align-items:center;gap:10px;font-size:13.5px;color:var(--muted)}
.byline-dot{width:6px;height:6px;border-radius:50%;background:var(--accent)}

/* ---------- RULE ---------- */
.rule .container{border-top:1px solid var(--line)}

/* ---------- SECTIONS ---------- */
.section{padding:78px 0}
.section-tint{background:var(--tint);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section h2{
  font-family:var(--serif);font-weight:500;
  font-size:clamp(27px,3.6vw,38px);line-height:1.14;letter-spacing:-.015em;
  margin-bottom:22px;
}
.body{font-size:18px;color:var(--ink-soft);max-width:620px;margin-bottom:42px}

/* ---------- PROBLEM CARDS ---------- */
.grid-2,.grid-3{display:grid;gap:1px;background:var(--line);border:1px solid var(--line);border-radius:14px;overflow:hidden}
.grid-2{grid-template-columns:1fr 1fr}
.grid-3{grid-template-columns:1fr 1fr 1fr}
.card{background:var(--bg);padding:30px 28px}
.card-no{font-family:var(--serif);font-size:15px;color:var(--accent);margin-bottom:14px}
.card h3{font-size:18px;font-weight:600;margin-bottom:9px;letter-spacing:-.01em}
.card p{font-size:15px;color:var(--muted)}

/* ---------- SOURCE LINE ---------- */
.source{font-size:13px;color:var(--muted);margin-top:30px;font-style:italic;line-height:1.5}

/* ---------- STEPS ---------- */
.steps{list-style:none;counter-reset:s;display:flex;flex-direction:column;gap:0}
.step{display:flex;gap:28px;padding:30px 0;border-top:1px solid var(--line)}
.step:first-child{border-top:none}
.step-k{
  flex:0 0 96px;font-size:13px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;
  color:var(--accent);padding-top:4px;
}
.step-body h3{font-family:var(--serif);font-weight:500;font-size:23px;margin-bottom:8px;letter-spacing:-.01em}
.step-body p{font-size:16.5px;color:var(--ink-soft);max-width:560px}

/* ---------- FEATURES ---------- */
.feature-list{display:grid;grid-template-columns:1fr 1fr;gap:34px 48px}
.feature h3{font-size:17px;font-weight:600;margin-bottom:8px;letter-spacing:-.01em}
.feature h3::before{content:"";display:inline-block;width:7px;height:7px;border-radius:2px;background:var(--accent);margin-right:9px;vertical-align:middle}
.feature p{font-size:15.5px;color:var(--muted)}

/* ---------- STATS (dark) ---------- */
.section-dark{background:var(--dark);color:#fff}
.big-quote{
  font-family:var(--serif);font-weight:500;
  font-size:clamp(24px,3.4vw,34px);line-height:1.3;letter-spacing:-.015em;
  color:#f4f4f2;max-width:660px;margin:0 auto 56px;text-align:center;
}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:32px;text-align:center}
#idea .stats{grid-template-columns:repeat(3,1fr)}
#idea .stat-num{font-size:clamp(24px,3.2vw,32px);text-transform:none}
.stat-num{font-family:var(--serif);font-size:clamp(42px,6vw,64px);font-weight:500;letter-spacing:-.02em;line-height:1}
.stat-num{background:linear-gradient(180deg,#fff,#c9c9c9);-webkit-background-clip:text;background-clip:text;color:transparent}
.stat-label{font-size:15px;color:#a1a1aa;margin-top:12px;max-width:240px;margin-inline:auto}

/* ---------- FLASHY IDEA SECTION ---------- */
#idea{position:relative;overflow:hidden;background:#060a07;padding:96px 0}
.idea-inner{position:relative;z-index:2}
.idea-aurora{position:absolute;inset:-10% 0;z-index:0;pointer-events:none;filter:blur(82px);opacity:.24}
.idea-aurora .blob{position:absolute;border-radius:50%;mix-blend-mode:screen}
.blob-a{width:520px;height:520px;left:-40px;top:-120px;background:radial-gradient(circle,#1f9d4e,transparent 66%);animation:drift1 34s ease-in-out infinite}
.blob-b{width:460px;height:460px;right:-70px;top:-40px;background:radial-gradient(circle,#16c79a,transparent 66%);animation:drift2 40s ease-in-out infinite}
.blob-c{width:560px;height:560px;left:34%;bottom:-240px;background:radial-gradient(circle,#39d353,transparent 66%);animation:drift3 46s ease-in-out infinite}
@keyframes drift1{0%,100%{transform:translate(0,0)}50%{transform:translate(40px,28px)}}
@keyframes drift2{0%,100%{transform:translate(0,0)}50%{transform:translate(-38px,34px)}}
@keyframes drift3{0%,100%{transform:translate(0,0) scale(1)}50%{transform:translate(20px,-20px) scale(1.05)}}

.idea-curve{position:absolute;left:0;bottom:0;width:100%;height:58%;z-index:1;opacity:.28;filter:drop-shadow(0 0 7px rgba(45,220,120,.45))}
.curve-spark{filter:drop-shadow(0 0 7px #6bff9e)}

/* gradient phrase highlights */
.g-grad{
  background:linear-gradient(100deg,#39d353,#16c79a 45%,#5dff9b);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.g-glow{filter:drop-shadow(0 0 10px rgba(57,211,83,.28))}

/* glowing, colorful stats */
#idea .stats{margin-top:6px}
#idea .stat{position:relative;padding-top:24px}
.stat-dot{
  position:absolute;top:0;left:50%;width:7px;height:7px;border-radius:50%;
  background:#39d353;transform:translateX(-50%);box-shadow:0 0 8px rgba(57,211,83,.6);
}
/* every task -> every team -> every mistake: progressively brighter & shinier (all green) */
#idea .stat:nth-child(1){opacity:.6}
#idea .stat:nth-child(2){opacity:.8}
#idea .stat:nth-child(3){opacity:1}
#idea .stat-num{-webkit-background-clip:text;background-clip:text;color:transparent}
#idea .stat:nth-child(1) .stat-num{background:linear-gradient(135deg,#3aa564,#2b8f4e);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;filter:drop-shadow(0 0 4px rgba(46,160,90,.12))}
#idea .stat:nth-child(2) .stat-num{background:linear-gradient(135deg,#43c970,#2fae57);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;filter:drop-shadow(0 0 9px rgba(57,211,83,.3))}
#idea .stat:nth-child(3) .stat-num{background:linear-gradient(135deg,#9bffbe,#39d353);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;filter:drop-shadow(0 0 18px rgba(95,255,150,.6))}
#idea .stat:nth-child(1) .stat-dot{box-shadow:0 0 5px rgba(57,211,83,.4)}
#idea .stat:nth-child(2) .stat-dot{box-shadow:0 0 10px rgba(57,211,83,.65)}
#idea .stat:nth-child(3) .stat-dot{width:8px;height:8px;box-shadow:0 0 15px rgba(120,255,160,.9)}
#idea .stat-label{color:#9fe9bd}
#idea .ie-white{color:#fff;-webkit-text-fill-color:#fff}
@media (prefers-reduced-motion:reduce){.idea-aurora .blob,.stat-dot,.curve-spark{animation:none}}

/* ---------- RESEARCH ---------- */
.research-list{display:flex;flex-direction:column}
.research-item{
  display:block;padding:26px 0;border-top:1px solid var(--line);
  transition:transform .2s ease;will-change:transform;
}
.research-item:first-child{border-top:none}
.research-item:hover{transform:translateX(8px)}
.research-meta{font-size:12.5px;letter-spacing:.05em;text-transform:uppercase;color:var(--muted);margin-bottom:9px}
.research-item h3{font-family:var(--serif);font-weight:500;font-size:22px;letter-spacing:-.01em;margin-bottom:8px;color:var(--ink)}
.research-item p{font-size:16px;color:var(--ink-soft);max-width:620px;margin-bottom:11px}
.research-link{font-size:14.5px;font-weight:500;color:var(--accent)}
.research-item:hover .research-link{text-decoration:underline}

/* ---------- WHY ---------- */
.why-list{display:flex;flex-direction:column;gap:0}
.why{padding:26px 0;border-top:1px solid var(--line)}
.why:first-child{border-top:none}
.why h3{font-size:19px;font-weight:600;margin-bottom:7px;letter-spacing:-.01em}
.why p{font-size:16px;color:var(--ink-soft);max-width:620px}

/* ---------- CTA ---------- */
.cta{padding:96px 0;text-align:center;background:var(--tint);border-top:1px solid var(--line)}
.cta h2{font-family:var(--serif);font-weight:500;font-size:clamp(30px,4.4vw,46px);letter-spacing:-.02em;margin-bottom:14px}
.cta p{font-size:18px;color:var(--ink-soft);margin-bottom:30px}
.cta-form{display:flex;gap:10px;justify-content:center;flex-wrap:wrap}
.cta-form input{
  font-family:var(--sans);font-size:15px;padding:11px 16px;border:1px solid var(--line);
  border-radius:999px;min-width:280px;background:#fff;outline:none;transition:border-color .2s;
}
.cta-form input:focus{border-color:var(--ink)}

/* ---------- FOOTER ---------- */
.footer{padding:64px 0 36px;border-top:1px solid var(--line)}
.footer-inner{display:flex;justify-content:space-between;gap:48px;flex-wrap:wrap;padding-bottom:40px}
.footer-brand{max-width:260px}
.footer-brand .brand-name{font-weight:600;font-size:17px;margin-left:8px}
.footer-tag{font-size:14px;color:var(--muted);margin-top:14px}
.footer-cols{display:flex;gap:56px;flex-wrap:wrap}
.footer-cols h4{font-size:13px;text-transform:uppercase;letter-spacing:.06em;color:var(--ink);margin-bottom:14px}
.footer-cols a{display:block;font-size:14.5px;color:var(--muted);margin-bottom:9px;transition:color .2s}
.footer-cols a:hover{color:var(--ink)}
.footer-base{display:flex;justify-content:space-between;border-top:1px solid var(--line);padding-top:22px;font-size:13.5px;color:var(--muted);flex-wrap:wrap;gap:8px}

/* ---------- REVEAL ANIM ---------- */
.reveal{opacity:0;transform:translateY(14px);transition:opacity .6s ease, transform .6s ease}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}}

/* ---------- RESPONSIVE ---------- */
@media (max-width:760px){
  .nav-links{display:none}
  .grid-2,.grid-3,.feature-list{grid-template-columns:1fr}
  .stats,#idea .stats{grid-template-columns:1fr;gap:28px 20px}
  .step{flex-direction:column;gap:8px}
  .step-k{flex-basis:auto}
  .hero{padding:64px 0 48px}
  .jungle{white-space:normal}
  .jungle .vine{display:none}
  .jungle .leaf{width:20px;height:20px}
  .jungle .leaf-1{width:22px;height:22px;left:-8px;top:-14px}
  .jungle .leaf-3{width:20px;height:20px;right:-6px}
}

/* ---------- BLOG POST ---------- */
.post{padding:40px 0 88px}
.post-narrow{max-width:800px}
/* centered editorial header */
.post-head{text-align:center;margin-bottom:50px}
.post-meta-top{font-size:15px;color:var(--ink);margin-bottom:26px}
.post-meta-top .muted{color:var(--muted)}
.post-title{
  font-family:var(--sans);font-weight:700;font-size:clamp(26px,3.8vw,40px);
  line-height:1.08;letter-spacing:-.03em;color:var(--ink);
}
/* byline row with share */
.post-byline{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  border-top:1px solid var(--line);padding-top:20px;margin-bottom:48px;
}
.byline-left{display:flex;align-items:center;gap:12px}
.byline-avatar{
  width:38px;height:38px;border-radius:50%;flex:0 0 38px;
  display:flex;align-items:center;justify-content:center;
  font-size:13px;font-weight:600;color:#063b1d;
  background:linear-gradient(135deg,#6fe39a,#1f9d4e);letter-spacing:.02em;
}
.byline-name{font-size:15px;font-weight:600;color:var(--ink)}
.byline-role{font-weight:400;color:var(--muted)}
.byline-share{
  display:inline-flex;align-items:center;gap:7px;background:none;border:none;cursor:pointer;
  font-family:var(--sans);font-size:14.5px;color:var(--muted);padding:6px 4px;transition:color .2s;
}
.byline-share:hover{color:var(--ink)}
.byline-share.copied{color:var(--accent)}
.share-ico{width:16px;height:16px;fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}

.post-body p{font-size:19px;color:var(--ink-soft);line-height:1.72;margin-bottom:24px}
.post-body .post-lede{font-size:19px;color:var(--ink-soft);line-height:1.72;margin-bottom:24px}
.post-body h2{font-family:var(--serif);font-weight:500;font-size:27px;letter-spacing:-.015em;margin:48px 0 14px;color:var(--ink)}
.post-body h3{font-size:18px;font-weight:600;margin:30px 0 8px;color:var(--ink)}
.post-body strong{color:var(--ink);font-weight:600}
.post-body em{font-style:italic}
.post-body a{color:var(--accent);text-decoration:underline;text-underline-offset:2px}
.post-body .post-note{font-size:14px;color:var(--muted);border-left:2px solid var(--line);padding-left:16px;margin-top:36px}
.post-body a.post-cta{color:#fff;text-decoration:none;margin-top:32px}
.post-body a.btn-ghost{color:var(--ink);text-decoration:none}

figure{margin:38px 0}
figcaption{font-size:13.5px;color:var(--muted);text-align:center;margin-top:14px;line-height:1.5;max-width:560px;margin-inline:auto}

/* charts */
.chart{width:100%;height:auto;display:block;background:var(--tint);border:1px solid var(--line);border-radius:14px;padding:10px}
.chart .grid line{stroke:#e2e6e0;stroke-width:1}
.chart .axis-text text{fill:#9aa39c;font-family:var(--sans);font-size:12px}
.chart .cat-text text{fill:#5b635c;font-family:var(--sans);font-size:13px;text-anchor:middle}
.chart .axis-title{fill:#9aa39c;font-size:12px}
.chart .bar-val text{fill:#0b0b0c;font-family:var(--sans);font-size:13px;font-weight:600;text-anchor:middle}
.chart .delta{fill:#1f9d4e;font-family:var(--sans);font-size:13px;font-weight:700;text-anchor:middle}
.chart .ref{stroke:#b9bdb7;stroke-width:1;stroke-dasharray:4 4}
.chart .trend{stroke:#1f9d4e;stroke-width:2.5;stroke-linejoin:round;stroke-linecap:round}
.chart .dots circle{fill:#1f9d4e}

/* ---------- FOUNDER QUOTE ---------- */
.quote-band{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:60px 0;text-align:center}
.pquote{
  font-family:var(--serif);font-weight:500;font-size:clamp(22px,2.9vw,31px);
  line-height:1.36;letter-spacing:-.015em;color:var(--ink);
  max-width:740px;margin:0 auto 30px;
}
.quote-author{display:inline-flex;align-items:center;gap:14px;text-align:left}
.quote-avatar{width:58px;height:58px;border-radius:50%;overflow:hidden;flex:0 0 58px;border:1px solid var(--line)}
.quote-avatar img{width:100%;height:100%;object-fit:cover;display:block}
.quote-name{font-weight:600;font-size:15px;color:var(--ink)}
.quote-role{font-size:13.5px;color:var(--muted);display:flex;align-items:center;gap:4px;flex-wrap:wrap}
.oai-logo{height:15px;width:auto;vertical-align:middle;display:inline-block}

/* ---------- LABS / TRUST BANNER ---------- */
.labs-band{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:28px 0;text-align:center}
.labs-logos{display:flex;align-items:center;justify-content:center;gap:40px;flex-wrap:wrap;margin-bottom:14px}
.labs-logo{width:auto;filter:grayscale(1);opacity:.6;transition:opacity .2s}
.labs-band:hover .labs-logo{opacity:.8}
.lab-openai{height:34px}
.lab-meta{height:22px}
.lab-xai{height:26px}
.labs-pitch{font-size:14.5px;color:var(--muted);max-width:640px;margin:0 auto;line-height:1.5}
.labs-pitch a{color:var(--accent);font-weight:500;white-space:nowrap}
.labs-pitch a:hover{text-decoration:underline}

/* ---------- FALLING LEAVES (problem section) ---------- */
#problem{position:relative;overflow:hidden}
.falling-leaf{position:absolute;top:-14px;pointer-events:none;z-index:4;opacity:0;
  animation:leaf-fall var(--dur,3.4s) cubic-bezier(.45,.05,.55,.95) forwards;
  animation-delay:var(--delay,0s);}
.falling-leaf svg{width:100%;height:100%;display:block;filter:drop-shadow(0 3px 5px rgba(20,120,60,.18))}
.falling-leaf svg .v{fill:none;stroke:#0e5e30;stroke-width:.9;opacity:.45}
@keyframes leaf-fall{
  0%{transform:translateY(-20px) translateX(0) rotate(0);opacity:0}
  12%{opacity:.95}
  72%{opacity:.95}
  100%{transform:translateY(var(--fall,440px)) translateX(var(--drift,40px)) rotate(var(--spin,560deg));opacity:0}
}
@media (prefers-reduced-motion:reduce){.falling-leaf{display:none}}

/* research author bylines */
.research-authors{font-size:15px;color:var(--muted);line-height:1.5}
.research-authors strong{color:var(--ink);font-weight:600}