/* ===== Dynamic Formulas — shared design system (v3) =====
   Reference direction: atrantil.ca — light, bold sans, two-tone headline, green accent.
   Palette intentionally brand-neutral-clinical: ink navy + leaf green + warm gold accent. */

:root{
  --ink:#12263F;          /* headings */
  --ink-2:#33455E;        /* body */
  --muted:#6A7A90;
  --green:#3E8E51;        /* brand accent / CTA */
  --green-dk:#2F7040;
  --green-lt:#EDF6EF;
  --gold:#D99A2B;
  --paper:#FFFFFF;
  --bg:#FFFFFF;
  --bg-soft:#F5F8F6;
  --line:#E4EAE6;
  --shadow-sm:0 2px 10px rgba(18,38,63,.06);
  --shadow-md:0 16px 44px rgba(18,38,63,.10);
  --radius:16px;
  --container:1180px;
  --sans:'Inter','Noto Sans SC',system-ui,-apple-system,'PingFang SC','Microsoft YaHei',sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--sans);color:var(--ink-2);background:var(--bg);line-height:1.68;-webkit-font-smoothing:antialiased;overflow-x:hidden}
h1,h2,h3,h4{font-family:var(--sans);color:var(--ink);line-height:1.18;font-weight:700;text-wrap:balance;letter-spacing:-.015em}
h1{font-size:clamp(2.1rem,4.4vw,3.35rem)}
h2{font-size:clamp(1.65rem,3.1vw,2.4rem);margin-bottom:.55em}
h3{font-size:1.14rem;font-weight:700}
p{margin-bottom:1rem}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.container{max-width:var(--container);margin:0 auto;padding:0 24px}
section{padding:88px 0;position:relative}
.lead{font-size:1.12rem;max-width:64ch;color:var(--ink-2)}
.center{text-align:center;margin-left:auto;margin-right:auto}
.muted{color:var(--muted)}
.accent{color:var(--green)}
.bg-soft{background:var(--bg-soft)}
.bg-ink{background:var(--ink);color:#C6D3E2}
.bg-ink h2,.bg-ink h3{color:#fff}

/* language switching */
body[data-lang="en"] .zh,body[data-lang="en"] .es,body[data-lang="en"] .fr{display:none!important}
body[data-lang="zh"] .en,body[data-lang="zh"] .es,body[data-lang="zh"] .fr{display:none!important}
body[data-lang="es"] .en,body[data-lang="es"] .zh,body[data-lang="es"] .fr{display:none!important}
body[data-lang="fr"] .en,body[data-lang="fr"] .zh,body[data-lang="fr"] .es{display:none!important}
body[data-lang="zh"]{letter-spacing:.005em}

.eyebrow{display:inline-block;color:var(--green);font-weight:700;font-size:.78rem;letter-spacing:.16em;text-transform:uppercase;margin-bottom:14px}
body[data-lang="zh"] .eyebrow{letter-spacing:.22em;text-transform:none}

/* ===== buttons ===== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5em;font-weight:700;font-size:.98rem;padding:15px 30px;border-radius:6px;border:2px solid transparent;cursor:pointer;transition:background .18s,color .18s,transform .18s,box-shadow .18s;letter-spacing:.01em}
.btn-primary{background:var(--green);color:#fff}
.btn-primary:hover{background:var(--green-dk);transform:translateY(-1px);box-shadow:0 8px 20px rgba(62,142,81,.28)}
.btn-outline{background:transparent;color:var(--ink);border-color:#CBD5DD}
.btn-outline:hover{border-color:var(--green);color:var(--green)}
.btn-light{background:#fff;color:var(--green)}
.btn-light:hover{background:#F2F7F3}
.btn:focus-visible{outline:3px solid var(--gold);outline-offset:2px}
.btn-lg{padding:17px 36px;font-size:1.04rem}

/* ===== utility bar + header ===== */
.util{border-bottom:1px solid var(--line);background:#fff}
.util .container{display:flex;justify-content:flex-end;align-items:center;gap:22px;height:40px;font-size:.8rem;font-weight:600;color:var(--muted)}
.util a:hover{color:var(--green)}
.lang{display:inline-flex;gap:2px;align-items:center}
.lang button{border:0;background:transparent;padding:4px 7px;border-radius:4px;cursor:pointer;color:var(--muted);font-weight:700;font-family:var(--sans);font-size:.78rem}
.lang button.on{background:var(--green-lt);color:var(--green-dk)}
.lang button:hover{color:var(--green)}

header.nav{position:sticky;top:0;z-index:90;background:rgba(255,255,255,.94);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid transparent;transition:box-shadow .2s,border-color .2s}
header.nav.scrolled{border-bottom-color:var(--line);box-shadow:0 4px 18px rgba(18,38,63,.06)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:78px;gap:18px}
.logo img{height:36px;width:auto}
.nav-links{display:flex;gap:26px;font-size:.9rem;font-weight:600;color:var(--ink)}
.nav-links a{position:relative;padding:6px 0;white-space:nowrap}
.nav-links a::after{content:'';position:absolute;left:0;bottom:0;width:0;height:2px;background:var(--green);transition:width .2s}
.nav-links a:hover::after,.nav-links a.active::after{width:100%}
.nav-links a.active{color:var(--green)}
.nav-right{display:flex;align-items:center;gap:12px}
.burger{display:none;background:none;border:0;cursor:pointer;padding:6px}
.drawer{display:none;position:fixed;top:78px;left:0;right:0;z-index:89;background:#fff;border-bottom:1px solid var(--line);box-shadow:var(--shadow-md);padding:16px 24px 24px;flex-direction:column}
.drawer.open{display:flex}
.drawer a{padding:14px 4px;font-weight:600;color:var(--ink);border-bottom:1px solid var(--bg-soft)}

/* ===== hero ===== */
.hero{background:linear-gradient(180deg,#F7FBF8 0%,#FFFFFF 70%);padding:72px 0 84px;overflow:hidden}
.hero-grid{display:grid;grid-template-columns:1.06fr .94fr;gap:54px;align-items:center}
.hero h1 .l1{color:var(--green);display:block}
.hero h1 .l2{color:var(--ink);display:block}
.hero .sub{font-size:1.05rem;color:var(--muted);font-weight:600;margin:14px 0 0}
.pain{font-size:1.1rem;color:var(--ink);font-weight:600;margin:26px 0 10px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap;margin-top:28px}
.trustbar{display:flex;flex-wrap:wrap;gap:12px 26px;margin-top:30px;padding-top:24px;border-top:1px solid var(--line);font-size:.88rem;font-weight:600;color:var(--ink-2)}
.trustbar span{display:inline-flex;align-items:center;gap:8px}

/* day/night value prop */
.dn{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:22px}
.dn-card{border:1px solid var(--line);border-radius:12px;padding:16px 18px;background:#fff}
.dn-card .hd{display:flex;align-items:center;gap:9px;font-weight:700;color:var(--ink);margin-bottom:4px;font-size:.95rem}
.dn-ic{width:28px;height:28px;border-radius:8px;display:flex;align-items:center;justify-content:center;color:#fff;flex:0 0 28px}
.dn-ic svg{width:16px;height:16px}
.dn-ic.am{background:linear-gradient(140deg,#F0B44E,#D99A2B)}
.dn-ic.pm{background:linear-gradient(140deg,#3E5C8C,#223A63)}
.dn-card p{font-size:.88rem;margin:0;color:var(--ink-2)}

/* hero protocol visual: bottles sit ABOVE the protocol card */
.rxv{position:relative;padding-top:74px}
.rx-bottles{position:absolute;top:0;left:50%;transform:translateX(-50%);z-index:3;display:flex;align-items:flex-end;gap:6px;pointer-events:none}
.rx-bottles img{height:168px;width:auto;filter:drop-shadow(0 16px 26px rgba(18,38,63,.22))}
.rx-bottles img:nth-child(2){height:150px}
.rx{position:relative;z-index:2;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow-md);padding:112px 26px 24px}
.rx-head{text-align:center;border-bottom:1px solid var(--line);padding-bottom:14px;margin-bottom:4px}
.rx-head .t{font-weight:800;color:var(--ink);font-size:1.06rem}
.rx-head .d{font-size:.74rem;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--green);margin-top:3px}
body[data-lang="zh"] .rx-head .d{letter-spacing:.18em}
.rx-row{display:flex;gap:13px;align-items:flex-start;padding:15px 0;border-bottom:1px dashed var(--line)}
.rx-row:last-of-type{border-bottom:0}
.rx-ic{width:36px;height:36px;flex:0 0 36px;border-radius:10px;display:flex;align-items:center;justify-content:center;color:#fff}
.rx-ic.am{background:linear-gradient(140deg,#F0B44E,#D99A2B)}
.rx-ic.pm{background:linear-gradient(140deg,#3E5C8C,#223A63)}
.rx-ic svg{width:19px;height:19px}
.rx-when{font-size:.7rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}
.rx-name{font-weight:700;color:var(--ink);font-size:.97rem;margin:1px 0 2px}
.rx-dose{font-size:.83rem;color:var(--ink-2)}
.rx-qty{margin-left:auto;font-weight:800;color:var(--ink);font-size:1.02rem;white-space:nowrap}
.rx-foot{display:flex;align-items:center;gap:9px;margin-top:13px;padding-top:13px;border-top:1px solid var(--line);font-size:.8rem;color:var(--muted)}
.rx-foot svg{width:15px;height:15px;color:var(--green);flex:0 0 15px}

/* ===== generic layout pieces ===== */
.grid{display:grid;gap:24px}
.cols-2{grid-template-columns:repeat(2,1fr)}
.cols-3{grid-template-columns:repeat(3,1fr)}
.cols-4{grid-template-columns:repeat(4,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow-sm);transition:transform .2s,box-shadow .2s}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md)}
.ic{width:42px;height:42px;color:var(--green);flex:0 0 auto}
.ic svg{width:100%;height:100%}
.card .ic{margin-bottom:14px}
.tile{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px 22px;text-align:center;transition:transform .2s,box-shadow .2s}
.tile:hover{transform:translateY(-3px);box-shadow:var(--shadow-md)}
.tile .ic{margin:0 auto 12px}
.tile h3{margin-bottom:5px}
.emoji{font-size:1.6rem;line-height:1;display:block;margin-bottom:10px}

/* signal list (emoji bullets) */
.siglist{list-style:none}
.siglist li{display:flex;gap:14px;padding:17px 0;border-bottom:1px solid var(--line)}
.siglist li:last-child{border-bottom:0}
.siglist .e{font-size:1.3rem;line-height:1.4;flex:0 0 28px}
.siglist b{display:block;color:var(--ink);margin-bottom:2px}
.siglist span.txt{font-size:.95rem}

/* two-column compare */
.cmp{display:grid;grid-template-columns:1fr 1fr;gap:26px}
.cmp-col{border:1px solid var(--line);border-radius:var(--radius);padding:30px;background:#fff}
.cmp-col.risk{background:#FFFCF6;border-color:#F0E1C4}
.cmp-col h3{display:flex;align-items:center;gap:10px;margin-bottom:16px;font-size:1.1rem}
.cmp-col h3 .dot{width:10px;height:10px;border-radius:50%;flex:0 0 10px}
.cmp-col.good h3 .dot{background:var(--green)}
.cmp-col.risk h3 .dot{background:var(--gold)}

/* refs */
.refs{background:var(--bg-soft);border-radius:var(--radius);padding:26px 30px;margin-top:34px}
.refs h4{font-size:.76rem;letter-spacing:.16em;text-transform:uppercase;color:var(--green);margin-bottom:14px}
body[data-lang="zh"] .refs h4{letter-spacing:.2em}
.refs ol{padding-left:19px;font-size:.86rem;line-height:1.75}
.refs li{margin-bottom:10px}
.refs li:last-child{margin-bottom:0}
.refs i{color:var(--ink);font-style:normal;font-weight:700}

/* formula cards */
.fchip{display:inline-block;font-size:.7rem;font-weight:800;letter-spacing:.14em;text-transform:uppercase;padding:5px 12px;border-radius:999px;margin-bottom:14px;background:#FBF1DE;color:#8A6114}
body[data-lang="zh"] .fchip{letter-spacing:.18em}
.fchip.night{background:#E9EEF8;color:#2B4173}
.fcard h3{font-size:1.3rem;margin-bottom:6px}
.fcard .dose{font-weight:800;color:var(--green-dk);margin-bottom:12px;font-size:1rem}
.excip{font-size:.8rem;color:var(--muted);border-top:1px dashed var(--line);padding-top:12px;margin-top:14px}

/* roadmap weeks */
.weeks{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;position:relative;margin-top:46px}
.weeks::before{content:'';position:absolute;top:24px;left:7%;right:7%;height:2px;background:linear-gradient(90deg,var(--green),var(--gold));opacity:.3}
.week{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:52px 22px 24px;position:relative;box-shadow:var(--shadow-sm)}
.week .num{position:absolute;top:0;left:22px;transform:translateY(-50%);width:38px;height:38px;border-radius:50%;background:var(--green);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:1rem;box-shadow:0 4px 12px rgba(62,142,81,.32)}
.week .wk{font-size:.72rem;font-weight:800;letter-spacing:.14em;text-transform:uppercase;color:var(--green);margin-bottom:5px}
body[data-lang="zh"] .week .wk{letter-spacing:.24em}
.week p{font-size:.9rem;margin:0}

/* guarantee */
.gbox{display:grid;grid-template-columns:120px 1fr;gap:32px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:20px;padding:40px;box-shadow:var(--shadow-md);position:relative;overflow:hidden}
.gbox::before{content:'';position:absolute;left:0;top:0;bottom:0;width:5px;background:linear-gradient(180deg,var(--green),var(--gold))}
.seal{width:120px;height:120px;color:var(--gold)}

/* pricing */
.plans{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;align-items:stretch;margin-top:46px}
.plan{background:#fff;border:1.5px solid var(--line);border-radius:18px;padding:34px 28px;text-align:center;position:relative;display:flex;flex-direction:column;transition:transform .2s,box-shadow .2s}
.plan:hover{transform:translateY(-4px);box-shadow:var(--shadow-md)}
.plan.best{border-color:var(--green);box-shadow:0 18px 44px rgba(62,142,81,.16)}
.plan .ribbon{position:absolute;top:-13px;left:50%;transform:translateX(-50%);background:var(--green);color:#fff;font-size:.7rem;font-weight:800;letter-spacing:.1em;text-transform:uppercase;padding:6px 15px;border-radius:999px;white-space:nowrap}
body[data-lang="zh"] .plan .ribbon{letter-spacing:.16em}
.plan .amt{font-size:2.5rem;color:var(--ink);font-weight:800;margin-top:8px}
.plan .per{font-size:.85rem;color:var(--muted)}
.plan ul{list-style:none;text-align:left;margin:20px 0;font-size:.91rem}
.plan li{padding:8px 0 8px 25px;border-bottom:1px dashed var(--line);position:relative}
.plan li::before{content:'✓';position:absolute;left:2px;color:var(--green);font-weight:800}
.plan .btn{margin-top:auto;width:100%}

/* FAQ */
.faq{max-width:820px;margin:0 auto}
.qa{background:#fff;border:1px solid var(--line);border-radius:12px;margin-bottom:12px;overflow:hidden;transition:box-shadow .2s}
.qa.open{box-shadow:var(--shadow-md)}
.qa button.q{width:100%;text-align:left;background:none;border:0;padding:21px 22px;font-size:1.02rem;color:var(--ink);font-weight:700;cursor:pointer;display:flex;justify-content:space-between;gap:16px;align-items:center;font-family:var(--sans)}
.qa .a{display:grid;grid-template-rows:0fr;transition:grid-template-rows .3s ease}
.qa.open .a{grid-template-rows:1fr}
.qa .a-in{overflow:hidden;padding:0 22px}
.qa.open .a-in{padding-bottom:21px}
.qa .plus{flex:0 0 24px;width:24px;height:24px;border-radius:50%;background:var(--green-lt);color:var(--green-dk);display:flex;align-items:center;justify-content:center;font-size:1.1rem;transition:transform .25s;line-height:1}
.qa.open .plus{transform:rotate(45deg)}

/* contact form */
.cform{max-width:620px;margin:32px auto 0;background:#fff;border:1px solid var(--line);border-radius:18px;padding:34px;box-shadow:var(--shadow-md)}
.cform .row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.cform label{display:block;font-size:.84rem;font-weight:700;color:var(--ink);margin-bottom:6px}
.cform input,.cform textarea{width:100%;font-family:var(--sans);font-size:1rem;color:var(--ink);background:var(--bg-soft);border:1.5px solid var(--line);border-radius:10px;padding:13px 15px;transition:border-color .18s}
.cform input:focus,.cform textarea:focus{outline:none;border-color:var(--green)}
.cform textarea{min-height:126px;resize:vertical}
.cform .fld{margin-bottom:17px}
.cform .btn{width:100%;margin-top:5px}
.cform .note{font-size:.82rem;text-align:center;margin:13px 0 0;color:var(--muted)}

/* footer */
footer{background:var(--ink);color:#93A6BC;font-size:.9rem;padding:60px 0 40px}
footer h4{color:#fff;font-size:.88rem;margin-bottom:14px;letter-spacing:.05em}
footer a:hover{color:#fff}
.foot-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;margin-bottom:40px}
.foot-brand{font-size:1.24rem;color:#fff;font-weight:800;margin-bottom:10px}
.foot-grid p{margin-bottom:.5rem}
.addr{font-size:.85rem;line-height:1.6;color:#7E93AC;margin-top:12px}
.legal-body{background:#0E1E33;border-radius:12px;padding:20px 24px;margin-bottom:24px;font-size:.77rem;color:#7E93AC;line-height:1.8}
.legal-body h5{color:#B4C4D6;font-size:.79rem;margin:0 0 6px;letter-spacing:.05em}
.legal-body .blk{margin-bottom:15px}
.legal-body .blk:last-child{margin-bottom:0}
.disclaimer{border-top:1px solid #22364F;padding-top:24px;font-size:.78rem;color:#6D8199;line-height:1.75}

/* sticky buy bar (mobile) */
.buybar{position:fixed;left:0;right:0;bottom:0;z-index:80;background:rgba(255,255,255,.97);backdrop-filter:blur(10px);border-top:1px solid var(--line);box-shadow:0 -6px 22px rgba(18,38,63,.1);padding:11px 18px;display:none;align-items:center;justify-content:space-between;gap:14px}
.buybar .p{font-weight:800;color:var(--ink);font-size:.93rem}
.buybar .btn{padding:12px 24px}

/* reveal */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .55s ease,transform .55s ease}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}}

/* ===== responsive ===== */
@media(max-width:1080px){.nav-links{display:none}}
@media(max-width:900px){
  section{padding:60px 0}
  .hero{padding:44px 0 56px}
  .hero-grid,.cmp{grid-template-columns:1fr;gap:34px}
  .rxv{order:-1;padding-top:66px;max-width:430px;margin:0 auto}
  .rx-bottles img{height:140px}
  .rx-bottles img:nth-child(2){height:126px}
  .rx{padding-top:96px}
  .cols-2,.cols-3,.cols-4,.weeks,.plans,.dn{grid-template-columns:1fr}
  .weeks::before{display:none}
  .nav-right .btn{display:none}
  .burger{display:block}
  .gbox{grid-template-columns:1fr;text-align:center;padding:32px 24px}
  .seal{margin:0 auto}
  .foot-grid{grid-template-columns:1fr 1fr;gap:28px}
  .buybar{display:flex}
  body{padding-bottom:72px}
  .cform{padding:24px 20px}
  .cform .row{grid-template-columns:1fr}
  .util .container{gap:14px;font-size:.75rem}
}