/* ============================================================
   FUEL SHIFT - marketing site
   ============================================================ */
:root{
  --bg:#07080c; --bg2:#0b0d13;
  --card:rgba(255,255,255,.035); --card2:rgba(255,255,255,.06);
  --line:rgba(255,255,255,.09); --line2:rgba(255,255,255,.16);
  --tx:#f2f4f8; --tx2:#a5adbd; --tx3:#6b7385;
  --blood:#58E7F2; --liver:#FFB43D; --muscle:#A98CFF; --fat:#FF7A45;
  --good:#3FD68C; --accent:#FFB43D;
  --maxw:1080px; --r:20px;
  --ease:cubic-bezier(.22,.9,.28,1);
  --font:-apple-system,BlinkMacSystemFont,"SF Pro Text","Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--tx);font:400 16px/1.6 var(--font);
  -webkit-font-smoothing:antialiased;overflow-x:hidden}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
h1,h2,h3{margin:0;letter-spacing:-.035em;font-weight:680;line-height:1.1}
p{margin:0}
ul{margin:0;padding:0;list-style:none}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px}
.glow{position:fixed;inset:0;pointer-events:none;z-index:0;
  background:radial-gradient(820px 520px at 50% -10%,rgba(255,180,61,.13),transparent 62%),
             radial-gradient(620px 460px at 92% 14%,rgba(169,140,255,.10),transparent 60%),
             radial-gradient(680px 500px at 4% 60%,rgba(88,231,242,.07),transparent 62%)}
section{position:relative;z-index:1}

/* ---- nav ---- */
.nav{position:sticky;top:0;z-index:50;backdrop-filter:blur(20px) saturate(1.3);
  -webkit-backdrop-filter:blur(20px) saturate(1.3);
  background:rgba(7,8,12,.72);border-bottom:1px solid transparent;transition:border-color .3s}
.nav.stuck{border-bottom-color:var(--line)}
.nav-in{display:flex;align-items:center;gap:16px;height:64px;max-width:var(--maxw);margin:0 auto;padding:0 20px}
.logo{display:inline-flex;align-items:center;gap:9px;font-weight:700;font-size:17px;
  letter-spacing:-.03em;min-height:44px;padding:4px 2px}
.nav-sp{flex:1}
.nav a.txt{display:inline-flex;align-items:center;min-height:44px;padding:0 4px;
  font-size:14.5px;color:var(--tx2);font-weight:550;white-space:nowrap}
.nav a.txt:hover{color:var(--tx)}
/* a phone has no room for the section links; the logo and the CTA are what matter */
@media(max-width:760px){
  .nav-in{gap:10px;height:58px}
  .nav a.txt.sec-link{display:none}
  .logo{font-size:16px}
}
@media(max-width:400px){
  .nav a.txt{font-size:13.5px}
  .btn-sm{padding:8px 12px;font-size:13.5px}
}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 22px;border-radius:13px;font-weight:650;font-size:15px;min-height:48px;
  border:1px solid transparent;transition:transform .15s var(--ease),filter .2s}
.btn:active{transform:scale(.975)}
.btn-p{background:linear-gradient(180deg,#FFC768,#FF9E2B);color:#231400;
  box-shadow:0 8px 28px -10px rgba(255,168,45,.7)}
.btn-p:hover{filter:brightness(1.06)}
.btn-g{background:var(--card2);border-color:var(--line);color:var(--tx)}
.btn-sm{padding:9px 16px;min-height:40px;font-size:14px;border-radius:11px}

/* ---- logo ---- */
.mark{width:26px;height:26px;flex:0 0 26px;color:var(--tx);overflow:visible}
.mark-lg{width:46px;height:46px;flex:none;margin:0 auto 22px}
.wm{font-weight:750;letter-spacing:-.032em}
.wm-b{color:var(--fat)}

/* ---- hero ---- */
.hero{position:relative;padding:56px 0 44px;overflow:hidden}
.hero-bg{position:absolute;inset:0;z-index:0;pointer-events:none}
.hero-bg img{width:100%;height:100%;object-fit:cover;object-position:24% 28%;opacity:.72}
.hero-bg::after{content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(7,8,12,.42) 0%,rgba(7,8,12,.72) 52%,var(--bg) 97%),
             radial-gradient(76% 96% at 76% 44%,rgba(7,8,12,0),rgba(7,8,12,.86) 82%)}
.hero-grid{position:relative;z-index:2;display:grid;gap:40px;align-items:center}
.hero-copy{text-align:center}
.pill{display:inline-flex;align-items:center;gap:8px;padding:7px 14px;border-radius:99px;
  font-size:12.5px;font-weight:600;color:var(--accent);
  background:rgba(255,180,61,.10);border:1px solid rgba(255,180,61,.28);margin-bottom:22px}
.pill i{width:6px;height:6px;border-radius:50%;background:var(--accent);
  box-shadow:0 0 0 0 rgba(255,180,61,.6);animation:pp 2.4s infinite;font-style:normal}
@keyframes pp{70%{box-shadow:0 0 0 9px rgba(255,180,61,0)}100%{box-shadow:0 0 0 0 rgba(255,180,61,0)}}
.hero h1{font-size:clamp(34px,7.2vw,58px);max-width:16ch;margin:0 auto}
.hero h1 em{font-style:normal;background:linear-gradient(100deg,#FFD489,#FF7A45 55%,#A98CFF);
  -webkit-background-clip:text;background-clip:text;color:transparent}
.hero .sub{font-size:clamp(15.5px,2.3vw,18px);color:var(--tx2);max-width:54ch;margin:20px auto 0;line-height:1.55}
.cta{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-top:30px}
.cta-note{margin-top:14px;font-size:13px;color:var(--tx3)}

/* ---- the phone: the real app instrument runs inside it ---- */
.hero-demo{display:flex;flex-direction:column;align-items:center}
.phone{position:relative;width:100%;max-width:310px;padding:9px;border-radius:42px;
  background:linear-gradient(165deg,#2b3040,#0d0f16 42%,#23283a);
  box-shadow:0 50px 100px -34px rgba(0,0,0,.95),0 0 0 1px rgba(255,255,255,.07),
             inset 0 1px 0 rgba(255,255,255,.14)}
.phone::before{content:"";position:absolute;inset:-24% -40% auto -40%;height:70%;
  background:radial-gradient(60% 60% at 50% 50%,rgba(255,180,61,.20),transparent 70%);
  filter:blur(24px);pointer-events:none;z-index:-1}
.phone-notch{position:absolute;top:15px;left:50%;transform:translateX(-50%);
  width:76px;height:20px;border-radius:99px;background:#05060a;z-index:3}
.phone-scr{position:relative;border-radius:34px;background:#07080c;overflow:hidden;
  padding:38px 10px 12px;border:1px solid rgba(255,255,255,.07)}
.ph-top{display:flex;align-items:center;justify-content:space-between;gap:8px;
  padding:0 6px 8px;font-size:10.5px;font-weight:650;letter-spacing:.02em}
.ph-clock{color:var(--tx3);font-variant-numeric:tabular-nums}
.ph-state{color:var(--good);letter-spacing:.09em}
.ph-state[data-s="storing"]{color:var(--fat)}
.ph-state[data-s="fed"]{color:var(--liver)}
.ph-state[data-s="mixed"]{color:var(--liver)}
.ph-state[data-s="shift"]{color:var(--muscle)}
#hero-core{width:100%;height:auto;display:block;transition:opacity .25s}
.phone.is-paused #hero-core{opacity:.82}
/* The whole phone screen is the play control. It shows nothing while the
   simulation runs and a centred badge when it is paused, which is the state
   anyone with a reduced-motion preference lands on. iOS reports that
   preference for Low Power Mode too, so this is the opt-in for a lot of
   perfectly ordinary phones, not an edge case. */
.ph-play{position:absolute;inset:0;z-index:4;display:grid;place-items:center;
  background:transparent;transition:background .25s var(--ease);cursor:pointer;
  /* iOS otherwise flashes a grey block over the whole screen on tap, and waits
     300ms before firing the click. */
  -webkit-tap-highlight-color:transparent;touch-action:manipulation}
.ph-play:focus-visible{outline:2px solid var(--accent);outline-offset:-4px;border-radius:34px}
.ph-play-badge{width:56px;height:56px;border-radius:50%;display:grid;place-items:center;
  color:#231400;background:var(--accent);opacity:0;transform:scale(.88);
  box-shadow:0 0 0 8px rgba(255,180,61,.16),0 10px 30px -8px rgba(0,0,0,.9);
  transition:opacity .25s var(--ease),transform .25s var(--ease)}
.ph-play svg{width:24px;height:24px;display:block}
.ph-play .i-play{margin-left:3px}
.ph-play[aria-pressed="true"] .i-play,
.ph-play[aria-pressed="false"] .i-pause{display:none}
.phone.is-paused .ph-play{background:rgba(7,8,12,.5)}
.phone.is-paused .ph-play-badge{opacity:1;transform:none}
.ph-play:active .ph-play-badge{transform:scale(.94)}
.ph-foot{margin-top:8px;padding:9px 11px;border-radius:12px;font-size:11.5px;color:var(--tx2);
  background:rgba(255,255,255,.045);border:1px solid var(--line);text-align:center;min-height:36px;
  display:flex;align-items:center;justify-content:center}
.demo-cap{text-align:center;font-size:12.5px;color:var(--tx3);margin-top:16px;max-width:34ch}

@media(min-width:900px){
  .hero{padding:76px 0 64px}
  .hero-grid{grid-template-columns:1.05fr .95fr;gap:52px}
  .hero-copy{text-align:left}
  .hero h1{margin:0;font-size:clamp(40px,4.6vw,56px)}
  .hero .sub{margin-left:0;margin-right:0}
  .hero-copy .cta{justify-content:flex-start}
  .hero-bg img{object-position:16% 24%;opacity:.78}
  .hero-bg::after{background:linear-gradient(90deg,rgba(7,8,12,.62) 0%,rgba(7,8,12,.86) 42%,rgba(7,8,12,.97) 74%),
                             linear-gradient(180deg,rgba(7,8,12,.28),rgba(7,8,12,.1) 40%,var(--bg) 97%)}
}

/* ---- generic section ---- */
.sec{padding:76px 0}
.sec-head{text-align:center;max-width:640px;margin:0 auto 44px}
.eyebrow{display:block;font-size:12px;letter-spacing:.15em;text-transform:uppercase;
  color:var(--accent);font-weight:700;margin-bottom:14px}
.sec-head h2{font-size:clamp(26px,4.4vw,40px)}
.sec-head p{color:var(--tx2);margin-top:16px;font-size:16.5px;line-height:1.6}

/* ---- problem ---- */
.prob{background:var(--bg2);border-block:1px solid var(--line)}
.prob-grid{display:grid;gap:16px;grid-template-columns:1fr}
@media(min-width:760px){.prob-grid{grid-template-columns:1fr 1fr}}
.prob-card{padding:26px;border-radius:var(--r);border:1px solid var(--line);background:var(--card)}
.prob-card h3{font-size:19px;margin-bottom:10px}
.prob-card p{color:var(--tx2);font-size:15px}
.prob-card.bad{border-color:rgba(255,122,69,.3)}
.prob-card.bad h3{color:var(--fat)}
.prob-card.good{border-color:rgba(63,214,140,.3)}
.prob-card.good h3{color:var(--good)}

/* ---- tanks ---- */
.tanks-split{display:grid;gap:26px;max-width:760px;margin:0 auto}
.anat{position:relative;margin:0;border-radius:var(--r);overflow:hidden;
  border:1px solid var(--line);background:#05060a}
.anat img{width:100%;height:auto;opacity:.95}
.anat::after{content:"";position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(70% 60% at 50% 45%,transparent 40%,rgba(7,8,12,.55) 100%)}
.anat-tag{position:absolute;z-index:2;font-size:10.5px;font-weight:700;letter-spacing:.1em;
  text-transform:uppercase;color:var(--c);padding:4px 9px;border-radius:99px;
  background:rgba(7,8,12,.7);border:1px solid color-mix(in srgb,var(--c) 45%,transparent);
  backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px)}
@media(min-width:900px){
  .tanks-split{grid-template-columns:.72fr 1fr;gap:32px;max-width:1000px;align-items:start}
  .anat{position:sticky;top:88px}
}
.tanks{display:flex;flex-direction:column;gap:14px;max-width:760px;margin:0 auto}
.tank{display:grid;grid-template-columns:auto 1fr;gap:4px 18px;padding:22px 24px;
  border-radius:var(--r);background:var(--card);border:1px solid var(--line);
  border-left:3px solid var(--c)}
.tank-i{grid-row:1/3;width:44px;height:44px;border-radius:13px;display:grid;place-items:center;
  background:color-mix(in srgb,var(--c) 16%,transparent);border:1px solid color-mix(in srgb,var(--c) 40%,transparent)}
.tank-i b{color:var(--c);font-size:15px;font-weight:750}
.tank h3{font-size:17.5px;color:var(--c)}
.tank h3 span{color:var(--tx3);font-weight:500;font-size:13px;margin-left:8px;letter-spacing:0}
.tank p{color:var(--tx2);font-size:14.5px;margin-top:5px}
.scale{margin:36px auto 0;max-width:760px;padding:24px;border-radius:var(--r);
  background:var(--card);border:1px solid var(--line)}
.scale-row{display:flex;align-items:center;gap:12px;margin-bottom:11px;font-size:13px}
.scale-row>span:first-child{flex:0 0 92px;color:var(--tx2)}
.scale-bar{flex:1;height:14px;border-radius:99px;background:rgba(255,255,255,.05);overflow:hidden}
.scale-bar i{display:block;height:100%;border-radius:99px}
.scale-row b{flex:0 0 84px;text-align:right;font-variant-numeric:tabular-nums;font-size:12.5px}
.scale p{color:var(--tx3);font-size:13.5px;margin-top:14px;line-height:1.55}

/* ---- steps ---- */
.steps{display:grid;gap:18px;grid-template-columns:1fr}
@media(min-width:820px){.steps{grid-template-columns:repeat(3,1fr)}}
.step{padding:28px 24px;border-radius:var(--r);background:var(--card);border:1px solid var(--line)}
.step-n{width:34px;height:34px;border-radius:11px;display:grid;place-items:center;font-weight:750;
  font-size:15px;background:rgba(255,180,61,.13);border:1px solid rgba(255,180,61,.35);
  color:var(--accent);margin-bottom:16px}
.step h3{font-size:18px;margin-bottom:8px}
.step p{color:var(--tx2);font-size:14.5px}

/* ---- features ---- */
.feats{display:grid;gap:16px;grid-template-columns:1fr}
@media(min-width:700px){.feats{grid-template-columns:1fr 1fr}}
.feat{padding:24px;border-radius:var(--r);background:var(--card);border:1px solid var(--line);
  transition:border-color .25s,transform .25s var(--ease)}
.feat:hover{border-color:var(--line2);transform:translateY(-2px)}
.feat h3{font-size:17px;margin-bottom:8px;display:flex;align-items:center;gap:9px}
.feat h3 u{width:9px;height:9px;border-radius:3px;display:block;text-decoration:none}
.feat p{color:var(--tx2);font-size:14.5px}

/* ---- science ---- */
.sci{background:var(--bg2);border-block:1px solid var(--line)}
.sci-grid{display:grid;gap:16px;grid-template-columns:1fr}
@media(min-width:820px){.sci-grid{grid-template-columns:repeat(3,1fr)}}
.sci-card{padding:24px;border-radius:var(--r);background:var(--card);border:1px solid var(--line)}
.sci-card h3{font-size:16px;margin-bottom:9px}
.sci-card p{color:var(--tx2);font-size:14px}
.sci-list{max-width:760px;margin:32px auto 0;padding:24px;border-radius:var(--r);
  background:var(--card);border:1px solid var(--line)}
.sci-list h3{font-size:14px;margin-bottom:14px;color:var(--tx2)}
.sci-list li{font-size:13px;color:var(--tx3);padding:7px 0;border-bottom:1px solid var(--line);line-height:1.5}
.sci-list li:last-child{border-bottom:0}
.sci-list em{color:var(--tx2);font-style:normal}

/* ---- honest ---- */
.honest{max-width:760px;margin:0 auto;padding:30px;border-radius:var(--r);
  background:var(--card);border:1px solid var(--line)}
.honest li{display:flex;gap:13px;padding:13px 0;border-bottom:1px solid var(--line);
  font-size:14.5px;color:var(--tx2);line-height:1.55}
.honest li:last-child{border-bottom:0}
.honest li b{color:var(--tx);display:block;margin-bottom:3px}
.honest .x{flex:0 0 20px;color:var(--fat);font-weight:700}

/* ---- pricing ---- */
.price-card{max-width:440px;margin:0 auto;padding:34px 30px;border-radius:24px;text-align:center;
  background:linear-gradient(180deg,rgba(255,180,61,.09),rgba(255,255,255,.02));
  border:1px solid rgba(255,180,61,.3);box-shadow:0 30px 80px -40px rgba(255,150,40,.4)}
.price-amt{font-size:56px;font-weight:750;letter-spacing:-.05em;line-height:1;
  background:linear-gradient(180deg,#FFD489,#FF8A2B);-webkit-background-clip:text;
  background-clip:text;color:transparent}
.price-per{font-size:15px;color:var(--tx3);margin-top:8px}
.price-tri{margin:18px 0;padding:13px;border-radius:13px;font-size:14.5px;font-weight:600;
  background:rgba(63,214,140,.12);border:1px solid rgba(63,214,140,.3);color:var(--good)}
.price-list{text-align:left;margin:22px 0}
.price-list li{position:relative;padding:8px 0 8px 28px;font-size:14.5px;color:var(--tx2)}
.price-list li::before{content:"";position:absolute;left:4px;top:14px;width:12px;height:7px;
  border-left:2px solid var(--good);border-bottom:2px solid var(--good);transform:rotate(-45deg)}
.price-fine{font-size:12.5px;color:var(--tx3);margin-top:14px;line-height:1.55}

/* ---- faq ---- */
.faq{max-width:760px;margin:0 auto}
.faq details{border-bottom:1px solid var(--line)}
.faq summary{padding:20px 34px 20px 0;font-size:16px;font-weight:600;cursor:pointer;
  position:relative;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:6px;top:19px;font-size:22px;
  color:var(--accent);font-weight:400;line-height:1}
.faq details[open] summary::after{content:"\2212"}
.faq .a{padding:0 0 20px;color:var(--tx2);font-size:15px;line-height:1.65}

/* ---- image bands ---- */
.band{position:relative;overflow:hidden;padding:80px 0;border-block:1px solid var(--line)}
.band-sm{padding:64px 0}
.band-sm .band-img{object-position:50% 46%}
.band-img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.62;z-index:0}
.band::after{content:"";position:absolute;inset:0;z-index:1;pointer-events:none;
  background:linear-gradient(180deg,var(--bg) 0%,rgba(7,8,12,.46) 22%,rgba(7,8,12,.56) 76%,var(--bg) 100%)}
.band-in{position:relative;z-index:2;text-align:center}
.band-in h2{font-size:clamp(25px,4.2vw,38px);max-width:20ch;margin:0 auto}
.band-in p{color:var(--tx2);margin:16px auto 0;max-width:58ch;font-size:16px}
.tl-wrap{margin:34px auto 0;max-width:900px;padding:14px;border-radius:var(--r);
  background:rgba(7,8,12,.72);border:1px solid var(--line);
  backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px)}
#tl-canvas{width:100%;height:auto;display:block}
.tl-key{display:flex;flex-wrap:wrap;justify-content:center;gap:8px 20px;margin-top:16px;
  font-size:12px;color:var(--tx3)}
.tl-key span{display:inline-flex;align-items:center;gap:7px}
.tl-key u{width:14px;height:3px;border-radius:2px;display:block;text-decoration:none}
.tl-key u.dash{background:none !important;height:0;border-top:3px dashed var(--fat);border-radius:0}

/* ---- science backdrop ---- */
.sci{position:relative;overflow:hidden}
.sci-bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.42;z-index:0}
.sci::after{content:"";position:absolute;inset:0;z-index:1;pointer-events:none;
  background:linear-gradient(180deg,var(--bg2) 0%,rgba(11,13,19,.6) 26%,rgba(11,13,19,.86) 92%)}
.sci .wrap{position:relative;z-index:2}

/* ---- final ---- */
.final{position:relative;overflow:hidden;text-align:center;padding:96px 0}
.final .wrap{position:relative;z-index:2}
.final::after{content:"";position:absolute;inset:0;z-index:1;pointer-events:none;
  background:linear-gradient(180deg,var(--bg) 0%,rgba(7,8,12,.42) 26%,rgba(7,8,12,.6) 70%,rgba(7,8,12,.9) 100%)}
.final .band-img{opacity:.85;object-position:50% 58%}
.final h2{font-size:clamp(28px,5vw,44px);max-width:18ch;margin:0 auto}
.final p{color:var(--tx2);margin-top:18px;font-size:17px}

/* ---- footer ---- */
footer{border-top:1px solid var(--line);padding:40px 0 60px;background:var(--bg2)}
.foot-in{display:flex;flex-wrap:wrap;gap:22px;align-items:flex-start}
.foot-in>div:first-child{flex:1 1 250px}
.foot-logo{margin-bottom:4px;font-size:17px}
.foot-tag{color:var(--tx3);font-size:14px}
.foot-links{display:flex;gap:4px 18px;flex-wrap:wrap}
.foot-links a{display:inline-flex;align-items:center;min-height:40px;padding:0 2px;
  font-size:14px;color:var(--tx2)}
.foot-links a:hover{color:var(--tx)}
.disc{margin-top:28px;padding-top:22px;border-top:1px solid var(--line);
  font-size:12.5px;color:var(--tx3);line-height:1.65}

.reveal{opacity:0;transform:translateY(18px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
  /* Decorative CSS animation stops, but the canvas is the product demo and is
     opt-in through the play control rather than disabled outright. */
  .pill i{animation:none}
  *{transition-duration:.01ms !important}
}