:root{
  --green:#0b7b50; --green-deep:#073f2b; --green-soft:#e2f2e9; --pitch:#0c7049;
  --ai:#2879e8; --gold:#e6a52c; --danger:#d95858;
  --ink:#101713; --ink-2:#617067; --ink-3:#8b9890;
  --line:#e2e8e4; --bg:#f4f7f5; --surface:#fff;
  --maxw:1160px; --r:22px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0; background:var(--bg); color:var(--ink);
  font-family:'Noto Sans SC','PingFang SC',system-ui,-apple-system,sans-serif;
  font-size:16px; line-height:1.65; -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{margin:0;line-height:1.2;letter-spacing:.5px}
p{margin:.6em 0}
.muted{color:var(--ink-2)}
img{max-width:100%}

/* ---- buttons ---- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:46px;padding:0 22px;border-radius:999px;font-weight:700;font-size:15px;
  border:none;cursor:pointer;transition:transform .12s ease,box-shadow .2s ease,background .2s}
.btn:active{transform:scale(.97)}
.btn.lg{height:54px;padding:0 30px;font-size:16px}
.btn-primary{background:var(--green);color:#fff;box-shadow:0 10px 22px rgba(11,123,80,.28)}
.btn-primary:hover{background:#0a6b46}
.btn-line{background:#fff;color:var(--ink);border:1.5px solid var(--line)}
.btn-line:hover{border-color:var(--green);color:var(--green)}
.btn-ghost{background:var(--green-soft);color:var(--green-deep)}

/* ---- nav ---- */
.nav{position:sticky;top:0;z-index:50;display:flex;align-items:center;gap:18px;
  padding:14px 20px;background:rgba(255,255,255,.86);backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:10px}
.logo{font-size:24px}
.brand-text{display:flex;flex-direction:column;line-height:1.05}
.brand-text b{font-size:18px}
.brand-text i{font-style:normal;font-size:11px;color:var(--ink-3);letter-spacing:1.5px}
.nav-links{display:none;gap:26px;margin-left:18px;font-weight:600;color:var(--ink-2)}
.nav-links a:hover{color:var(--green)}
.nav-cta{display:none;gap:10px;margin-left:auto}
.nav-toggle{margin-left:auto;background:none;border:none;font-size:24px;cursor:pointer;color:var(--ink)}
.nav.open .nav-links{display:flex;position:absolute;top:64px;left:0;right:0;flex-direction:column;
  gap:0;background:#fff;border-bottom:1px solid var(--line);padding:8px 20px}
.nav.open .nav-links a{padding:12px 0;border-bottom:1px solid var(--line)}

/* ---- hero ---- */
.hero{position:relative;color:#fff;overflow:hidden;
  background:radial-gradient(120% 80% at 80% 0%,#0e9d66 0%,#0b7b50 45%,#06351f 100%)}
.hero-inner{max-width:var(--maxw);margin:0 auto;padding:48px 20px 60px;
  display:flex;flex-direction:column;gap:36px}
.eyebrow{display:inline-block;font-size:13px;letter-spacing:1px;color:#bfeede;
  background:rgba(255,255,255,.12);padding:6px 14px;border-radius:999px;align-self:flex-start}
.hero h1{font-size:44px;font-weight:800;margin:18px 0 14px}
.lead{font-size:17px;color:#e9f6ef;max-width:560px}
.lead strong{color:#fff}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px}
.disclaimer{margin-top:22px;font-size:12.5px;color:rgba(255,255,255,.62);max-width:560px}
.hero-visual{display:flex;flex-direction:column;align-items:center;gap:12px}
#pendulum{width:min(90vw,420px);height:min(90vw,420px);
  background:rgba(255,255,255,.06);border-radius:28px;border:1px solid rgba(255,255,255,.12)}
.hero-tag{font-size:12.5px;color:#bfeede}
.scroll-hint{text-align:center;color:rgba(255,255,255,.55);font-size:13px;padding-bottom:18px}

/* ---- sections ---- */
.section{max-width:var(--maxw);margin:0 auto;padding:64px 20px}
.section.alt{background:var(--surface);max-width:none}
.section.alt>*{max-width:var(--maxw);margin-left:auto;margin-right:auto}
.section-head{text-align:center;max-width:640px;margin:0 auto 38px}
.kicker{display:inline-block;color:var(--green);font-weight:800;font-size:13px;letter-spacing:2px;text-transform:uppercase}
.section-head h2{font-size:30px;margin:10px 0}
.section-head p{color:var(--ink-2)}

/* ---- 3 cards ---- */
.cards-3,.feat-grid{display:grid;grid-template-columns:1fr;gap:18px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:26px;
  box-shadow:0 8px 26px rgba(23,63,42,.05)}
.layer-ic{width:56px;height:56px;border-radius:16px;display:flex;align-items:center;justify-content:center;
  font-size:28px;margin-bottom:14px}
.layer-ic.stat{background:#eaf2ff}.layer-ic.chaos{background:var(--green-soft)}.layer-ic.crowd{background:#fdf3dd}
.layer h3{font-size:21px;margin-bottom:8px}
.layer ul{margin:14px 0 0;padding-left:18px;color:var(--ink-2);font-size:14.5px}
.layer ul li{margin:6px 0}
.layer ul b{color:var(--ink)}

/* ---- steps ---- */
.steps{list-style:none;margin:0;padding:0;display:grid;gap:16px;grid-template-columns:1fr}
.steps li{display:flex;gap:18px;background:var(--bg);border-radius:var(--r);padding:22px}
.step-n{flex:none;width:42px;height:42px;border-radius:12px;background:var(--green);color:#fff;
  display:flex;align-items:center;justify-content:center;font-weight:800;font-size:20px}
.steps h4{font-size:18px;margin-bottom:4px}

/* ---- science ---- */
.science{background:linear-gradient(180deg,#fff, #f0f6f2)}
.science-grid{display:grid;grid-template-columns:1fr;gap:22px}
.formula-box{background:var(--green-deep);color:#dff3e9;border-radius:var(--r);padding:30px}
.formula{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:20px;color:#9be8c6;text-align:center;
  padding:14px;background:rgba(255,255,255,.05);border-radius:14px}
.formula-cap{font-size:13px;color:#9fcbb6;text-align:center;margin-top:10px}
.hyp{margin-top:20px;font-size:14.5px;display:grid;gap:10px}
.hyp b{color:var(--gold)}
.quote{margin-top:20px;font-style:italic;color:#bfeede;border-left:3px solid var(--gold);padding-left:14px}
.tracks{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:26px}
.tracks h3{font-size:19px}.tracks h3.mt{margin-top:22px}
.track{display:flex;flex-direction:column;background:var(--bg);border-radius:14px;padding:14px 16px;margin-top:12px}
.track b{color:var(--green-deep)}.track span{font-size:13.5px;color:var(--ink-2)}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.chips span{background:var(--green-soft);color:var(--green-deep);font-size:13px;font-weight:600;padding:6px 14px;border-radius:999px}

/* ---- features ---- */
.feat{background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:22px}
.feat i{font-size:30px;font-style:normal}
.feat h4{font-size:18px;margin:10px 0 6px}
.feat p{color:var(--ink-2);font-size:14.5px;margin:0}

/* ---- play ---- */
.play{max-width:var(--maxw);margin:0 auto}
.play-card{background:linear-gradient(135deg,#0b7b50,#073f2b);color:#fff;border-radius:28px;
  padding:34px;display:flex;flex-direction:column;gap:26px;align-items:center;text-align:center}
.poster-mini{width:200px;border-radius:14px;box-shadow:0 18px 40px rgba(0,0,0,.35)}
.play-copy h2{font-size:26px;margin:8px 0}
.play-copy p{color:#dff3e9}
.play .kicker{color:#9be8c6}
.play .btn-line{background:rgba(255,255,255,.12);color:#fff;border-color:rgba(255,255,255,.25)}
.play .hero-actions{justify-content:center}

/* ---- footer ---- */
.footer{background:#06351f;color:#bfeede;text-align:center;padding:46px 20px}
.foot-brand{font-weight:800;font-size:18px;color:#fff;margin-bottom:12px}
.foot-legal{font-size:13px;color:#9fcbb6;max-width:680px;margin:0 auto 14px;line-height:1.7}
.foot-copy{font-size:13px;color:#7fae97}

/* ---- hero stat ---- */
.hero-stat{display:inline-flex;align-items:baseline;gap:12px;margin-top:24px;
  background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.22);border-radius:18px;padding:14px 22px}
.hs-label{font-size:13px;color:#bfeede}
.hs-num{font-size:40px;font-weight:800;color:#ddf36c;line-height:1}

/* ---- performance stats ---- */
.stats-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.stat{background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:24px 16px;text-align:center}
.stat.hi{background:var(--green);border-color:var(--green);box-shadow:0 12px 30px rgba(11,123,80,.25)}
.stat-num{font-size:44px;font-weight:800;line-height:1;color:var(--green-deep)}
.stat.hi .stat-num{color:#ddf36c}
.stat-lab{font-size:15px;font-weight:700;margin-top:10px;color:var(--ink)}
.stat.hi .stat-lab{color:#fff}
.stat-sub{font-size:12.5px;color:var(--ink-3);margin-top:5px}
.stat.hi .stat-sub{color:#cdeede}
.honest{margin-top:22px;background:var(--green-soft);border-radius:16px;padding:18px 22px;font-size:14.5px;color:var(--green-deep);line-height:1.75}
.honest b{color:var(--green)}

/* ---- lambda + factor tiers ---- */
.lambda-box{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:14.5px;color:var(--green-deep);
  background:var(--surface);border:1.5px dashed var(--green);border-radius:16px;padding:18px 20px;
  text-align:center;overflow-x:auto;white-space:nowrap;margin-bottom:24px}
.tiers{display:grid;grid-template-columns:1fr;gap:18px}
.tier{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:24px}
.tier-hd{display:flex;align-items:center;gap:12px;margin-bottom:6px}
.tier-b{width:38px;height:38px;border-radius:11px;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:18px;color:#fff;flex:none}
.tier-b.a{background:var(--ai)}.tier-b.b{background:var(--gold)}.tier-b.c{background:#7c5cff}
.tier h3{font-size:19px}
.tier ul{margin:8px 0 0;padding-left:18px;color:var(--ink-2);font-size:14px;line-height:1.75}
.tier ul li{margin:5px 0}.tier ul b{color:var(--ink)}

/* ===== desktop ===== */
@media(min-width:860px){
  .nav-links,.nav-cta{display:flex}
  .nav-toggle{display:none}
  .hero-inner{flex-direction:row;align-items:center;padding:72px 20px 84px}
  .hero-copy{flex:1.15}
  .hero-visual{flex:1}
  .hero h1{font-size:60px}
  .cards-3{grid-template-columns:repeat(3,1fr)}
  .feat-grid{grid-template-columns:repeat(3,1fr)}
  .stats-grid{grid-template-columns:repeat(4,1fr)}
  .tiers{grid-template-columns:repeat(3,1fr)}
  .lambda-box{font-size:16px}
  .steps{grid-template-columns:repeat(2,1fr)}
  .science-grid{grid-template-columns:1.1fr 1fr}
  .play-card{flex-direction:row;text-align:left;padding:46px}
  .play .hero-actions{justify-content:flex-start}
  .section-head h2{font-size:36px}
}