/* ==========================================================================
   Advanced Amino Formula — Core Stylesheet
   Palette: deep navy / warm parchment / muted sage / soft gold accent
   Type: Sora (display) + Source Sans 3 (body)
   Signature element: the "eight-link chain" — a linked-node motif that
   stands for the eight essential amino acids, used in the hero, section
   dividers, and the ingredient index.
   ========================================================================== */

:root{
  /* --- Color --- */
  --navy-950:#0b1d2e;
  --navy-800:#132a40;
  --navy-700:#1c3a55;
  --parchment:#f6f2e9;
  --parchment-dim:#efe9db;
  --paper:#fffdf9;
  --charcoal:#22262b;
  --ink:#20262c;
  --ink-soft:#4b5560;
  --sage:#5f7d63;
  --sage-dim:#e7ede6;
  --gold:#b8923f;
  --gold-soft:#e9d9ae;
  --line:#dcd4c1;
  --line-navy:rgba(255,255,255,0.14);
  --danger:#8a3324;
  --white:#ffffff;

  /* --- Type --- */
  --font-display:'Sora', 'Source Sans 3', sans-serif;
  --font-body:'Source Sans 3', -apple-system, sans-serif;

  /* --- Scale --- */
  --fs-body:1.125rem;         /* 18px min */
  --lh-body:1.75;
  --radius:14px;
  --radius-sm:8px;
  --shadow-1:0 1px 2px rgba(11,29,46,.06), 0 8px 24px rgba(11,29,46,.06);
  --shadow-2:0 4px 10px rgba(11,29,46,.10), 0 20px 48px rgba(11,29,46,.12);
  --container:1180px;
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important;scroll-behavior:auto !important;}
}

body{
  margin:0;
  font-family:var(--font-body);
  font-size:var(--fs-body);
  line-height:var(--lh-body);
  color:var(--ink);
  background:var(--parchment);
  -webkit-font-smoothing:antialiased;
}

h1,h2,h3,h4{
  font-family:var(--font-display);
  color:var(--navy-950);
  line-height:1.15;
  margin:0 0 .6em;
  letter-spacing:-0.01em;
}
h1{font-size:clamp(2.1rem,4.4vw,3.4rem);}
h2{font-size:clamp(1.6rem,3vw,2.35rem);}
h3{font-size:clamp(1.25rem,2vw,1.55rem);}
p{margin:0 0 1.1em;}
a{color:var(--navy-700);text-decoration-thickness:1.5px;text-underline-offset:3px;}
a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{
  outline:3px solid var(--gold);
  outline-offset:2px;
}
img{max-width:100%;height:auto;display:block;}
.container{max-width:var(--container);margin-inline:auto;padding-inline:20px;}
section{padding:76px 0;}
@media (max-width:640px){section{padding:52px 0;}}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-display);font-weight:600;font-size:.8rem;
  letter-spacing:.14em;text-transform:uppercase;color:var(--sage);
  margin-bottom:14px;
}
.eyebrow::before{content:"";width:22px;height:2px;background:var(--gold);display:inline-block;}
.section-head{max-width:760px;margin-bottom:44px;}
.section-head.center{margin-inline:auto;text-align:center;}
.lede{font-size:1.2rem;color:var(--ink-soft);}

/* --- Skip link --- */
.skip-link{
  position:absolute;left:12px;top:-60px;background:var(--navy-950);color:#fff;
  padding:12px 18px;border-radius:8px;z-index:1000;transition:top .2s;
}
.skip-link:focus{top:12px;}

/* --- Buttons --- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-family:var(--font-display);font-weight:600;font-size:1rem;
  padding:15px 28px;border-radius:999px;min-height:44px;
  border:2px solid transparent;cursor:pointer;text-decoration:none;
  transition:transform .15s ease, box-shadow .15s ease, background .15s ease;
}
.btn-primary{background:var(--gold);color:var(--navy-950);}
.btn-primary:hover{transform:translateY(-2px);box-shadow:var(--shadow-2);background:#c7a250;}
.btn-outline{background:transparent;border-color:var(--navy-950);color:var(--navy-950);}
.btn-outline:hover{background:var(--navy-950);color:#fff;}
.btn-ghost-light{background:transparent;border-color:rgba(255,255,255,.55);color:#fff;}
.btn-ghost-light:hover{background:rgba(255,255,255,.12);}
.btn-block{width:100%;}

/* --- Announcement bar --- */
.announce{
  background:var(--navy-950);color:#f2ede0;font-size:.92rem;
  padding:9px 0;overflow:hidden;
}
.announce .container{display:flex;gap:28px;justify-content:center;flex-wrap:wrap;text-align:center;}
.announce span{display:inline-flex;align-items:center;gap:8px;}
.announce span::before{content:"";width:5px;height:5px;border-radius:50%;background:var(--gold);}

/* --- Nav --- */
.site-header{
  position:sticky;top:0;z-index:100;background:transparent;
  border-bottom:1px solid transparent;
  transition:background .25s ease,border-color .25s ease,box-shadow .25s ease;
}
.site-header.is-scrolled{
  background:rgba(246,242,233,.92);backdrop-filter:saturate(160%) blur(10px);
  border-bottom-color:var(--line);box-shadow:var(--shadow-1);
}
/* Header blends seamlessly into a dark hero until scrolled, then becomes solid */
.site-header[data-theme="dark-hero"]{background:var(--navy-950);border-bottom-color:transparent;}
.site-header[data-theme="dark-hero"].is-scrolled{
  background:rgba(246,242,233,.92);backdrop-filter:saturate(160%) blur(10px);border-bottom-color:var(--line);
}
/* Transparent header sitting on a dark hero: light text until scrolled */
.site-header[data-theme="dark-hero"]:not(.is-scrolled) .nav-links > li > a{color:#f2ede0;}
.site-header[data-theme="dark-hero"]:not(.is-scrolled) .nav-links > li > a:hover{color:#fff;}
.site-header[data-theme="dark-hero"]:not(.is-scrolled) .nav-toggle span,
.site-header[data-theme="dark-hero"]:not(.is-scrolled) .nav-toggle span::before,
.site-header[data-theme="dark-hero"]:not(.is-scrolled) .nav-toggle span::after{background:#fff;}
.site-header[data-theme="dark-hero"]:not(.is-scrolled) .btn-outline{border-color:rgba(255,255,255,.55);color:#fff;}
.nav-row{display:flex;align-items:center;justify-content:space-between;padding:14px 0;gap:16px;}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--font-display);font-weight:700;font-size:1.15rem;color:var(--navy-950);text-decoration:none;}
.brand img{height:34px;width:auto;border-radius:6px;}
.nav-links{display:flex;gap:26px;list-style:none;margin:0;padding:0;align-items:center;}
.nav-links a{color:var(--ink);font-weight:600;font-size:.98rem;text-decoration:none;}
.nav-links a:hover{color:var(--sage);}
.nav-cta{display:flex;align-items:center;gap:14px;}

/* --- Blog mega-menu (silo interlinking) --- */
.nav-links li.has-dropdown{position:relative;}
.nav-links li.has-dropdown > a::after{content:"▾";display:inline-block;margin-left:5px;font-size:.72em;vertical-align:1px;}
.nav-dropdown{
  position:absolute;top:100%;left:50%;transform:translate(-50%,6px);background:var(--paper);
  border:1px solid var(--line);border-radius:var(--radius-sm);box-shadow:var(--shadow-2);
  min-width:300px;padding:10px;list-style:none;margin:0;opacity:0;visibility:hidden;
  transition:opacity .18s ease,transform .18s ease,visibility .18s ease;z-index:50;
}
.nav-links li.has-dropdown:hover .nav-dropdown,
.nav-links li.has-dropdown:focus-within .nav-dropdown{opacity:1;visibility:visible;transform:translate(-50%,0);}
.nav-dropdown li{width:100%;}
.nav-dropdown a{display:block;padding:9px 10px;border-radius:6px;font-size:.86rem;font-weight:500;
  white-space:normal;line-height:1.3;color:var(--ink) !important;}
.nav-dropdown a:hover{background:var(--sage-dim);color:var(--sage) !important;}
.nav-dropdown .drop-cat{display:block;padding:6px 10px 2px;font-size:.72rem;font-weight:700;
  letter-spacing:.06em;text-transform:uppercase;color:var(--sage);}
.nav-dropdown .drop-viewall{border-top:1px solid var(--line);margin-top:6px;padding-top:8px;font-weight:700;color:var(--navy-700) !important;}
.nav-toggle{display:none;background:none;border:none;cursor:pointer;padding:8px;min-width:44px;min-height:44px;}
.nav-toggle span,.nav-toggle span::before,.nav-toggle span::after{
  content:"";display:block;width:24px;height:2px;background:var(--navy-950);position:relative;transition:.2s;
}
.nav-toggle span::before{position:absolute;top:-8px;}
.nav-toggle span::after{position:absolute;top:8px;}

@media (max-width:920px){
  .nav-links{
    position:fixed;inset:64px 0 0 0;background:var(--parchment);flex-direction:column;
    align-items:flex-start;padding:28px 24px;gap:6px;transform:translateX(100%);
    transition:transform .25s ease;overflow-y:auto;
  }
  .site-header[data-theme="dark-hero"] .nav-links > li > a{color:var(--ink);}
  .nav-links a{display:block;padding:12px 0;width:100%;border-bottom:1px solid var(--line);}
  .nav-links.open{transform:translateX(0);}
  .nav-toggle{display:block;}
  .nav-cta .btn-primary{display:none;}
  .nav-dropdown{
    position:static;opacity:1;visibility:visible;transform:none;box-shadow:none;
    border:none;background:transparent;min-width:0;padding:0 0 6px 14px;
  }
  .nav-dropdown a{padding:8px 0;border-bottom:none;color:var(--ink-soft) !important;}
  .nav-links li.has-dropdown > a::after{display:none;}
}

/* --- Hero --- */
.hero{
  background:linear-gradient(180deg,var(--navy-950) 0%,var(--navy-800) 100%);
  color:#f2ede0;position:relative;overflow:hidden;padding:64px 0 84px;
}
.hero .container{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center;}
@media (max-width:920px){.hero .container{grid-template-columns:1fr;}}
.hero h1{color:#fff;}
.hero .lede{color:#cdd7de;}
.chip-row{display:flex;flex-wrap:wrap;gap:10px;margin:22px 0 30px;}
.chip{
  display:inline-flex;align-items:center;gap:7px;font-size:.86rem;font-weight:600;
  background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.22);
  padding:8px 14px;border-radius:999px;color:#eef1e9;
}
.chip::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--gold);}
.hero-ctas{display:flex;gap:16px;flex-wrap:wrap;}
.hero-art{position:relative;display:flex;justify-content:center;}
.hero-art img{border-radius:22px;box-shadow:var(--shadow-2);}
.chain-svg{position:absolute;inset:auto -10% -18% auto;width:70%;opacity:.35;pointer-events:none;}

/* --- Trust strip --- */
.trust-strip{background:var(--paper);border-bottom:1px solid var(--line);}
.trust-strip .container{
  display:grid;grid-template-columns:repeat(6,1fr);gap:18px;padding-block:26px;
}
@media (max-width:920px){.trust-strip .container{grid-template-columns:repeat(3,1fr);}}
@media (max-width:560px){.trust-strip .container{grid-template-columns:repeat(2,1fr);}}
.trust-item{text-align:center;font-size:.88rem;font-weight:700;color:var(--navy-800);font-family:var(--font-display);}
.trust-item small{display:block;font-family:var(--font-body);font-weight:400;color:var(--ink-soft);font-size:.78rem;margin-top:2px;}

/* --- Two column / about --- */
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center;}
@media (max-width:860px){.two-col{grid-template-columns:1fr;}}
.two-col img{border-radius:var(--radius);box-shadow:var(--shadow-1);}
.reverse .two-col{grid-template-columns:1fr 1fr;}
.reverse .two-col > *:first-child{order:2;}
@media (max-width:860px){.reverse .two-col > *:first-child{order:0;}}

.about-alt{background:var(--paper);}

/* --- Chain divider (signature element) --- */
.chain-divider{display:flex;align-items:center;justify-content:center;gap:10px;margin:8px 0 42px;}
.chain-divider .node{
  width:11px;height:11px;border-radius:50%;background:var(--gold);
  box-shadow:0 0 0 4px var(--gold-soft);
}
.chain-divider .link{width:34px;height:2px;background:var(--line);}

/* --- Why EAA section --- */
.why-eaa{background:var(--navy-950);color:#eef1e9;}
.why-eaa .section-head h2{color:#fff;}
.why-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:22px;margin-top:12px;}
@media (max-width:760px){.why-grid{grid-template-columns:1fr;}}
.why-card{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.14);border-radius:var(--radius);padding:26px;}
.why-card .num{font-family:var(--font-display);color:var(--gold);font-weight:700;font-size:.85rem;letter-spacing:.08em;}
.why-card h3{color:#fff;margin-top:8px;}
.why-card p{color:#c3ccd2;margin-bottom:0;}

/* --- Benefit cards --- */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
@media (max-width:920px){.grid-3{grid-template-columns:repeat(2,1fr);}}
@media (max-width:620px){.grid-3{grid-template-columns:1fr;}}
.card{
  background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);
  padding:28px;box-shadow:var(--shadow-1);
}
.card .ico{
  width:46px;height:46px;border-radius:12px;background:var(--sage-dim);
  display:flex;align-items:center;justify-content:center;margin-bottom:16px;font-size:1.3rem;
}
.card h3{margin-bottom:8px;}
.card p{color:var(--ink-soft);margin-bottom:0;font-size:1rem;}

/* --- Ingredient grid --- */
.ing-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;}
@media (max-width:920px){.ing-grid{grid-template-columns:repeat(2,1fr);}}
@media (max-width:560px){.ing-grid{grid-template-columns:1fr;}}
.ing-card{
  background:var(--paper);border:1px solid var(--line);border-radius:var(--radius-sm);
  padding:22px;position:relative;
}
.ing-card .idx{
  position:absolute;top:16px;right:18px;font-family:var(--font-display);font-weight:700;
  color:var(--gold-soft);font-size:1.6rem;
}
.ing-card h3{font-size:1.1rem;margin-bottom:6px;}
.ing-card p{font-size:.96rem;color:var(--ink-soft);margin-bottom:0;}
.pku-flag{
  display:inline-block;margin-top:10px;font-size:.78rem;font-weight:700;
  background:#f6e6de;color:var(--danger);padding:4px 9px;border-radius:6px;
}

/* --- Formula compare (EAA vs BCAA) --- */
.compare-visual{display:grid;grid-template-columns:1fr auto 1fr;gap:24px;align-items:center;margin-top:8px;}
@media (max-width:760px){.compare-visual{grid-template-columns:1fr;}}
.compare-box{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:28px;text-align:center;}
.compare-box.featured{border-color:var(--gold);box-shadow:var(--shadow-2);}
.compare-box h3{margin-bottom:12px;}
.compare-vs{
  font-family:var(--font-display);font-weight:700;color:var(--sage);text-align:center;font-size:1.1rem;
}
.aa-pill-row{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-top:14px;}
.aa-pill{background:var(--sage-dim);color:var(--navy-800);font-size:.82rem;font-weight:600;padding:6px 11px;border-radius:999px;}
.aa-pill.dim{opacity:.55;}

/* --- Tables --- */
.table-wrap{overflow-x:auto;border-radius:var(--radius);border:1px solid var(--line);}
table{width:100%;border-collapse:collapse;background:var(--paper);min-width:560px;}
th,td{padding:15px 18px;text-align:left;border-bottom:1px solid var(--line);font-size:1rem;}
thead th{background:var(--navy-950);color:#fff;font-family:var(--font-display);font-weight:600;}
tbody tr:last-child td{border-bottom:none;}
tbody tr:nth-child(even){background:var(--parchment-dim);}

/* --- Steps --- */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
@media (max-width:820px){.steps{grid-template-columns:1fr;}}
.step{position:relative;background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:30px 26px;}
.step .step-num{
  font-family:var(--font-display);font-weight:700;color:var(--gold);font-size:.85rem;letter-spacing:.1em;
  display:block;margin-bottom:10px;
}
.callout{
  margin-top:34px;background:var(--sage-dim);border-left:4px solid var(--sage);
  border-radius:0 var(--radius-sm) var(--radius-sm) 0;padding:20px 24px;font-weight:600;color:var(--navy-800);
}

/* --- Who is it for --- */
.audience-list{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:1fr 1fr;gap:14px;}
@media (max-width:660px){.audience-list{grid-template-columns:1fr;}}
.audience-list li{
  display:flex;gap:12px;align-items:flex-start;background:var(--paper);
  border:1px solid var(--line);border-radius:var(--radius-sm);padding:16px 18px;font-size:1.02rem;
}
.audience-list li::before{content:"✓";color:var(--sage);font-weight:700;flex-shrink:0;}

.caution-box{
  background:#fbf2ec;border:1px solid #e7cdb9;border-radius:var(--radius);padding:26px 28px;margin-top:28px;
}
.caution-box h3{color:var(--danger);}

/* --- Timeline --- */
.timeline{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:10px;}
@media (max-width:760px){.timeline{grid-template-columns:1fr;}}
.timeline .tl-item{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:24px;}
.timeline .tl-day{font-family:var(--font-display);color:var(--sage);font-weight:700;}

/* --- Reviews --- */
.review-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
@media (max-width:920px){.review-grid{grid-template-columns:1fr 1fr;}}
@media (max-width:620px){.review-grid{grid-template-columns:1fr;}}
.review-card{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:24px;}
.review-card .tag{font-size:.78rem;font-weight:700;color:var(--sage);text-transform:uppercase;letter-spacing:.06em;}
.review-card p{margin:10px 0 0;color:var(--ink-soft);}
.review-note{margin-top:26px;font-size:.94rem;color:var(--ink-soft);border-top:1px solid var(--line);padding-top:20px;}

/* --- Pricing --- */
.pricing-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;align-items:stretch;}
@media (max-width:860px){.pricing-grid{grid-template-columns:1fr;}}
.price-card{
  background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);
  padding:30px 26px;display:flex;flex-direction:column;
}
.price-card.featured{border-color:var(--gold);box-shadow:var(--shadow-2);transform:translateY(-6px);position:relative;}
.price-card.featured::before{
  content:"Most Popular";position:absolute;top:-13px;left:50%;transform:translateX(-50%);
  background:var(--gold);color:var(--navy-950);font-family:var(--font-display);font-weight:700;
  font-size:.75rem;padding:5px 14px;border-radius:999px;
}
.price-card h3{margin-bottom:4px;}
.price-card .price{font-family:var(--font-display);font-size:2rem;font-weight:700;color:var(--navy-950);margin:10px 0;}
.price-card ul{list-style:none;margin:0 0 22px;padding:0;flex-grow:1;}
.price-card ul li{padding:7px 0;border-bottom:1px dashed var(--line);font-size:.98rem;}
.pricing-note{margin-top:22px;font-size:.92rem;color:var(--ink-soft);}

/* --- Guarantee --- */
.guarantee{background:var(--navy-950);color:#f2ede0;}
.guarantee .two-col{align-items:center;}
.guarantee h2{color:#fff;}
.guarantee p{color:#cdd7de;}

/* --- FAQ --- */
.faq-list{max-width:840px;margin-inline:auto;}
.faq-item{border-bottom:1px solid var(--line);}
.faq-item summary{
  display:flex;justify-content:space-between;align-items:center;gap:16px;
  padding:20px 4px;cursor:pointer;font-family:var(--font-display);font-weight:600;
  font-size:1.08rem;color:var(--navy-950);list-style:none;
}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary::after{content:"+";font-size:1.5rem;color:var(--gold);flex-shrink:0;transition:transform .2s;}
.faq-item[open] summary::after{transform:rotate(45deg);}
.faq-item .faq-a{padding:0 4px 22px;color:var(--ink-soft);max-width:70ch;}

/* --- Final CTA band --- */
.cta-band{background:linear-gradient(135deg,var(--navy-950),var(--navy-700));color:#fff;text-align:center;}
.cta-band h2{color:#fff;}
.cta-band p{color:#d3dade;max-width:620px;margin-inline:auto 1.4em;}

/* --- Footer --- */
.site-footer{background:var(--charcoal);color:#c7c9cc;padding:56px 0 26px;}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:36px;}
@media (max-width:760px){.footer-grid{grid-template-columns:1fr 1fr;}}
.footer-grid h4{color:#fff;font-family:var(--font-display);font-size:.95rem;margin-bottom:14px;}
.footer-grid ul{list-style:none;margin:0;padding:0;}
.footer-grid li{margin-bottom:9px;}
.footer-grid a{color:#c7c9cc;text-decoration:none;font-size:.95rem;}
.footer-grid a:hover{color:#fff;}
.footer-brand p{color:#a7abb0;font-size:.94rem;max-width:34ch;}
.footer-legal{
  margin-top:44px;padding-top:26px;border-top:1px solid #3a3f45;font-size:.82rem;color:#9a9ea3;line-height:1.7;
}
.footer-legal p{margin-bottom:.7em;}

/* --- Back to top --- */
.back-top{
  position:fixed;right:20px;bottom:20px;width:48px;height:48px;border-radius:50%;
  background:var(--navy-950);color:#fff;border:none;display:none;align-items:center;
  justify-content:center;cursor:pointer;box-shadow:var(--shadow-2);z-index:90;font-size:1.1rem;
}
.back-top.show{display:flex;}

/* --- Mobile sticky CTA --- */
.mobile-cta{
  display:none;position:fixed;left:0;right:0;bottom:0;z-index:95;
  background:var(--paper);border-top:1px solid var(--line);padding:12px 16px;
  box-shadow:0 -6px 20px rgba(0,0,0,.08);
}
@media (max-width:760px){.mobile-cta{display:block;}body{padding-bottom:78px;}}

/* --- Scroll reveal --- */
.reveal{opacity:0;transform:translateY(16px);transition:opacity .6s ease, transform .6s ease;}
.reveal.in{opacity:1;transform:none;}

/* --- Disclaimer banner --- */
.disclaimer-banner{
  background:var(--parchment-dim);border:1px solid var(--line);border-radius:var(--radius-sm);
  padding:16px 20px;font-size:.92rem;color:var(--ink-soft);margin-top:20px;
}

/* utility */
.text-center{text-align:center;}
.mt-0{margin-top:0;}
.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;}