/* =====================================================
   FlowStrong — getflowstrong.com
   Design: Premium Men's Health — Ocean Blue · Navy · Cyan · Ice White
   Fonts: Syne (bold geometric display) + DM Sans (clean body)
   Signature: Angled blue diagonal hero panel + left-cyan ingredient strips
   NO BLOG — single-page supplement site
   ===================================================== */

@import url('https://fonts.googleapis.com/css2?family=Syne:wght@600;700;800&family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;0,9..40,700;1,9..40,400&display=swap');

/* ── TOKENS ── */
:root {
  --blue:        #0057B8;
  --blue-dk:     #00408A;
  --blue-lt:     #1A6FD4;
  --blue-pale:   #E8F1FB;
  --navy:        #0A1628;
  --navy-md:     #0F2040;
  --cyan:        #00B4D8;
  --cyan-lt:     #48CAE4;
  --cyan-pale:   #E0F7FC;
  --ice:         #F0F7FF;
  --white:       #FFFFFF;
  --slate:       #4A5568;
  --slate-lt:    #718096;
  --slate-pale:  #EDF2F7;
  --ink:         #0A1628;
  --radius:      10px;
  --radius-lg:   18px;
  --radius-pill: 100px;
  --shadow:      0 2px 16px rgba(0,87,184,.10);
  --shadow-md:   0 6px 32px rgba(0,87,184,.15);
  --shadow-lg:   0 16px 56px rgba(0,87,184,.20);
  --font-display:'Syne', system-ui, sans-serif;
  --font-body:   'DM Sans', system-ui, sans-serif;
}

/* ── RESET ── */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:var(--font-body);color:var(--ink);background:var(--white);line-height:1.65;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}

/* ── UTILITY ── */
.wrap{max-width:1160px;margin:0 auto;padding:0 24px}
.sec{padding:80px 0}
.center{text-align:center}

/* ── TYPOGRAPHY ── */
.eyebrow{display:inline-block;font-family:var(--font-body);font-size:.68rem;font-weight:700;letter-spacing:.18em;text-transform:uppercase;color:var(--cyan);margin-bottom:10px}
.eyebrow-navy{color:var(--navy)}
.eyebrow-lt{display:inline-block;font-family:var(--font-body);font-size:.68rem;font-weight:700;letter-spacing:.18em;text-transform:uppercase;color:rgba(255,255,255,.5);margin-bottom:10px}
.h1{font-family:var(--font-display);font-size:clamp(2.4rem,5.5vw,3.8rem);line-height:1.06;font-weight:800;letter-spacing:-.02em}
.h2{font-family:var(--font-display);font-size:clamp(1.8rem,4vw,2.8rem);line-height:1.1;font-weight:700;letter-spacing:-.01em}
.h3{font-family:var(--font-display);font-size:clamp(1.2rem,2.5vw,1.55rem);line-height:1.2;font-weight:700}
.h4{font-family:var(--font-body);font-size:.95rem;font-weight:700;line-height:1.4}
.accent-blue{color:var(--blue)}
.accent-cyan{color:var(--cyan)}

.body-lg{font-size:1.08rem;line-height:1.78;color:var(--slate)}
.body-p{font-size:1rem;line-height:1.75;color:var(--slate)}
.body-sm{font-size:.875rem;line-height:1.65;color:var(--slate-lt)}
.body-lt{font-size:1rem;line-height:1.75;color:rgba(255,255,255,.72)}
.fine{font-size:.76rem;color:var(--slate-lt);margin-top:8px}
.fine-lt{font-size:.76rem;color:rgba(255,255,255,.38);margin-top:8px}

/* ── BUTTONS ── */
.btn{display:inline-flex;align-items:center;gap:8px;padding:14px 28px;border-radius:var(--radius);font-family:var(--font-body);font-size:.95rem;font-weight:700;cursor:pointer;border:none;transition:transform .18s,box-shadow .18s,background .18s;text-decoration:none;line-height:1.2}
.btn:hover{transform:translateY(-2px)}
.btn-xl{padding:17px 40px;font-size:1rem;border-radius:var(--radius-lg)}
.btn-blue{background:var(--blue);color:var(--white);box-shadow:0 4px 20px rgba(0,87,184,.35)}
.btn-blue:hover{background:var(--blue-lt);box-shadow:0 6px 28px rgba(0,87,184,.45)}
.btn-cyan{background:var(--cyan);color:var(--white);box-shadow:0 4px 20px rgba(0,180,216,.35)}
.btn-cyan:hover{background:var(--cyan-lt)}
.btn-outline-lt{background:transparent;color:var(--white);border:2px solid rgba(255,255,255,.4)}
.btn-outline-lt:hover{background:rgba(255,255,255,.1)}
.btn-navy{background:var(--navy);color:var(--white);box-shadow:0 4px 16px rgba(10,22,40,.35)}
.btn-navy:hover{background:var(--navy-md)}

/* ── NAVBAR ── */
.navbar{position:sticky;top:0;z-index:1000;background:rgba(10,22,40,.97);backdrop-filter:blur(16px);border-bottom:1px solid rgba(255,255,255,.06)}
.navbar.scrolled{box-shadow:0 2px 20px rgba(0,0,0,.35)}
.nav-inner{max-width:1160px;margin:0 auto;padding:0 24px;height:60px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.nav-logo{display:flex;align-items:center;gap:10px}
.nav-logo-text{font-family:var(--font-display);font-size:1.3rem;color:var(--white);line-height:1;font-weight:800;letter-spacing:-.01em}
.nav-logo-text span{color:var(--cyan)}
.nav-links{display:flex;align-items:center;gap:24px}
.nav-links a{font-size:.82rem;font-weight:600;color:rgba(255,255,255,.6);transition:color .2s;letter-spacing:.01em}
.nav-links a:hover{color:var(--white)}
.nav-cta{background:var(--blue)!important;color:var(--white)!important;padding:8px 18px;border-radius:7px;font-size:.82rem;font-weight:700;transition:background .2s!important}
.nav-cta:hover{background:var(--blue-lt)!important}
.hamburger{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:6px}
.hamburger span{display:block;width:22px;height:2px;background:var(--white);border-radius:2px;transition:.3s}
.mob-menu{display:none;position:fixed;inset:60px 0 0;background:var(--navy);z-index:999;padding:32px 24px;flex-direction:column;gap:16px;overflow-y:auto}
.mob-menu.open{display:flex}
.mob-menu a{font-size:1.05rem;font-weight:600;color:rgba(255,255,255,.75);padding:11px 0;border-bottom:1px solid rgba(255,255,255,.06)}
.mob-cta-btn{display:block;background:var(--blue);color:var(--white)!important;border:none!important;border-radius:10px;text-align:center;padding:15px;font-weight:700;margin-top:8px;font-size:1rem}

/* ── HERO — Diagonal panel signature ── */
.hero{background:var(--navy);position:relative;overflow:hidden;padding:72px 0 60px;min-height:90vh;display:flex;align-items:center}
/* Diagonal blue slab — THE signature element */
.hero-slab{position:absolute;top:0;right:-80px;width:55%;height:100%;background:linear-gradient(160deg,var(--blue) 0%,var(--blue-dk) 100%);clip-path:polygon(12% 0%,100% 0%,100% 100%,0% 100%);z-index:0}
.hero-slab::after{content:'';position:absolute;inset:0;background:linear-gradient(90deg,transparent 0%,rgba(0,180,216,.12) 100%)}
/* Ambient glow on left */
.hero-glow{position:absolute;top:30%;left:-60px;width:320px;height:320px;border-radius:50%;background:radial-gradient(circle,rgba(0,180,216,.18) 0%,transparent 70%);pointer-events:none;z-index:0}
.hero-inner{display:grid;grid-template-columns:1fr 420px;gap:48px;align-items:center;position:relative;z-index:2;width:100%}
.hero-left{}
.hero-label{display:inline-flex;align-items:center;gap:8px;background:rgba(0,180,216,.15);border:1px solid rgba(0,180,216,.3);border-radius:var(--radius-pill);padding:6px 16px;margin-bottom:24px}
.hero-label-dot{width:7px;height:7px;border-radius:50%;background:var(--cyan);animation:blink 2s ease-in-out infinite}
@keyframes blink{0%,100%{opacity:1}50%{opacity:.3}}
.hero-label span{font-size:.72rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--cyan)}
.hero h1{color:var(--white);margin-bottom:20px}
.hero-sub{font-size:1.08rem;line-height:1.78;color:rgba(255,255,255,.65);max-width:440px;margin-bottom:32px}
.hero-chips{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:32px}
.hero-chip{display:inline-flex;align-items:center;gap:6px;padding:6px 14px;border-radius:var(--radius-pill);background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.12);font-size:.78rem;font-weight:600;color:rgba(255,255,255,.75)}
.hero-chip svg{width:12px;height:12px;color:var(--cyan)}
.hero-btns{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:20px}
.hero-right{text-align:center;position:relative}
.hero-img-wrap{position:relative;display:inline-block}
.hero-img-wrap img{max-width:340px;margin:0 auto;filter:drop-shadow(0 24px 56px rgba(0,0,0,.5));animation:floatProduct 6s ease-in-out infinite}
@keyframes floatProduct{0%,100%{transform:translateY(0)}50%{transform:translateY(-14px)}}
/* Rating ring overlay on product */
.hero-badge{position:absolute;top:-10px;left:-12px;width:78px;height:78px;border-radius:50%;background:var(--cyan);display:flex;flex-direction:column;align-items:center;justify-content:center;box-shadow:0 4px 18px rgba(0,180,216,.45)}
.hero-badge .num{font-family:var(--font-display);font-size:1.35rem;font-weight:800;color:var(--white);line-height:1}
.hero-badge .lbl{font-size:.48rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:rgba(255,255,255,.85)}
.hero-rating{display:flex;align-items:center;justify-content:center;gap:8px;margin-top:16px}
.hero-stars{display:flex;gap:2px}
.hero-stars svg{width:15px;height:15px;fill:#F6C90E;color:#F6C90E}
.hero-rating-txt{font-size:.8rem;color:rgba(255,255,255,.5)}
.hero-rating-num{font-size:.8rem;font-weight:700;color:rgba(255,255,255,.85)}

/* ── TRUST BAR ── */
.trust-bar{background:var(--blue);padding:13px 0}
.trust-bar-inner{display:flex;flex-wrap:wrap;justify-content:center;gap:8px 28px}
.trust-item{display:flex;align-items:center;gap:7px;font-size:.79rem;font-weight:700;color:rgba(255,255,255,.9);letter-spacing:.02em}
.trust-item svg{width:14px;height:14px;color:rgba(255,255,255,.65)}

/* ── CERTIFICATIONS ── */
.certs-section{background:var(--ice);padding:48px 0}
.certs-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:0}
.cert-card{background:var(--white);border-radius:var(--radius-lg);padding:24px 20px;text-align:center;box-shadow:var(--shadow);border:1px solid rgba(0,87,184,.07)}
.cert-icon{width:52px;height:52px;border-radius:14px;background:var(--blue-pale);display:flex;align-items:center;justify-content:center;margin:0 auto 14px;font-size:1.4rem}
.cert-card h4{font-size:.9rem;font-weight:700;margin-bottom:6px;color:var(--ink)}
.cert-card p{font-size:.8rem;color:var(--slate-lt);line-height:1.55}

/* ── ABOUT ── */
.about-section{background:var(--white);padding:80px 0}
.about-inner{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center}
.about-content h2{margin-bottom:18px}
.about-content .body-lg{margin-bottom:18px}
.about-list{display:flex;flex-direction:column;gap:12px;margin-top:22px}
.about-point{display:flex;align-items:flex-start;gap:12px}
.about-dot{width:8px;height:8px;border-radius:50%;background:var(--blue);margin-top:8px;flex-shrink:0}
.about-point p{font-size:.92rem;color:var(--slate);line-height:1.65}
.about-img{border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow-lg)}
.about-img img{width:100%}

/* ── INGREDIENTS — Left cyan accent strips ── */
.ingredients-section{background:var(--ice);padding:80px 0}
.ing-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin-top:48px}
.ing-strip{display:flex;align-items:flex-start;gap:18px;background:var(--white);border-radius:var(--radius-lg);padding:22px 22px;border-left:4px solid var(--cyan);box-shadow:var(--shadow);transition:transform .2s,border-color .2s,box-shadow .2s}
.ing-strip:hover{transform:translateX(4px);border-left-color:var(--blue);box-shadow:var(--shadow-md)}
.ing-icon{width:48px;height:48px;border-radius:12px;background:var(--blue-pale);display:flex;align-items:center;justify-content:center;font-size:1.3rem;flex-shrink:0}
.ing-body h4{font-size:.95rem;font-weight:700;color:var(--ink);margin-bottom:6px}
.ing-body p{font-size:.82rem;color:var(--slate-lt);line-height:1.6}
.ing-tag{display:inline-block;margin-top:8px;font-size:.64rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--blue);background:var(--blue-pale);padding:3px 9px;border-radius:var(--radius-pill)}

/* ── PRICING ── */
.pricing-section{background:var(--navy);padding:80px 0}
.price-img-link{display:block;max-width:720px;margin:40px auto 32px;border-radius:var(--radius-lg);overflow:hidden;box-shadow:0 16px 60px rgba(0,0,0,.5)}
.price-img-link img{width:100%;display:block}
.price-cta{text-align:center}
.price-cta .btn{min-width:300px;justify-content:center}
.price-badges{display:flex;flex-wrap:wrap;justify-content:center;gap:14px;margin-top:20px}
.price-badge{display:flex;align-items:center;gap:6px;font-size:.8rem;font-weight:600;color:rgba(255,255,255,.45)}
.price-badge svg{width:14px;height:14px;color:var(--cyan)}

/* ── PAYMENT ── */
.payment-section{background:var(--blue-dk);padding:44px 0;text-align:center}
.payment-section h3{color:var(--white);margin-bottom:8px}
.payment-section .body-lt{margin-bottom:24px}
.payment-img-wrap{max-width:420px;margin:0 auto 24px}
.payment-img-wrap img{width:100%}

/* ── GUARANTEE ── */
.guarantee-section{background:var(--ice);padding:80px 0}
.guarantee-inner{display:grid;grid-template-columns:260px 1fr;gap:60px;align-items:center}
.guarantee-img img{width:100%;border-radius:var(--radius-lg)}
.guarantee-content h2{margin-bottom:16px}
.guarantee-content .body-lg{margin-bottom:20px}
.guarantee-points{display:flex;flex-direction:column;gap:12px}
.g-point{display:flex;align-items:flex-start;gap:12px}
.g-check{width:22px;height:22px;border-radius:50%;background:var(--blue);display:flex;align-items:center;justify-content:center;flex-shrink:0;margin-top:2px}
.g-check svg{width:11px;height:11px;color:var(--white)}
.g-point p{font-size:.9rem;color:var(--slate);line-height:1.62}

/* ── REVIEWS — 4 cards, 2x2 grid ── */
.reviews-section{background:var(--white);padding:80px 0}
.reviews-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:22px;margin-top:44px}
.review-card{background:var(--ice);border-radius:var(--radius-lg);padding:26px 24px;border:1px solid rgba(0,87,184,.08);position:relative;transition:box-shadow .2s}
.review-card:hover{box-shadow:var(--shadow-md)}
.review-card::before{content:'\201C';font-family:var(--font-display);font-size:4rem;color:var(--blue-pale);line-height:1;position:absolute;top:12px;right:20px;font-weight:800}
.review-stars{display:flex;gap:2px;margin-bottom:12px}
.review-stars svg{width:14px;height:14px;fill:#F6C90E;color:#F6C90E}
.review-img{width:56px;height:56px;border-radius:50%;object-fit:cover;margin-bottom:14px;border:2px solid var(--blue-pale)}
.review-card p{font-size:.88rem;line-height:1.72;color:var(--slate);margin-bottom:14px}
.reviewer-name{font-size:.85rem;font-weight:700;color:var(--ink)}
.reviewer-loc{font-size:.76rem;color:var(--slate-lt);margin-top:2px}
.reviewer-tag{font-size:.72rem;color:var(--blue);font-weight:700;margin-top:4px;display:flex;align-items:center;gap:4px}
.reviewer-tag svg{width:11px;height:11px}

/* ── HOW TO USE ── */
.howto-section{background:var(--navy-md);padding:80px 0}
.howto-steps{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:48px}
.howto-step{background:rgba(255,255,255,.05);border-radius:var(--radius-lg);padding:30px 24px;text-align:center;border:1px solid rgba(255,255,255,.08)}
.step-num{width:52px;height:52px;border-radius:var(--radius);background:var(--blue);color:var(--white);font-family:var(--font-display);font-size:1.4rem;font-weight:800;display:flex;align-items:center;justify-content:center;margin:0 auto 16px}
.howto-step h3{color:var(--white);font-size:1.1rem;margin-bottom:10px}
.howto-step p{font-size:.86rem;color:rgba(255,255,255,.55);line-height:1.65}

/* ── WHO IT'S FOR ── */
.target-section{background:var(--white);padding:80px 0}
.target-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;margin-top:48px}
.target-card{border-radius:var(--radius-lg);padding:32px 28px;border:1px solid var(--slate-pale)}
.target-card.good{background:var(--blue-pale);border-color:rgba(0,87,184,.15)}
.target-card.bad{background:var(--slate-pale);border-color:rgba(74,85,104,.12)}
.target-card h3{font-size:1.1rem;margin-bottom:18px}
.target-card h3.good-head{color:var(--blue)}
.target-card h3.bad-head{color:var(--slate)}
.target-list{display:flex;flex-direction:column;gap:10px}
.target-item{display:flex;align-items:flex-start;gap:10px;font-size:.88rem;color:var(--slate);line-height:1.6}
.target-item span{flex-shrink:0;margin-top:2px}

/* ── FAQ ── */
.faq-section{background:var(--ice);padding:80px 0}
.faq-list{max-width:740px;margin:44px auto 0;display:flex;flex-direction:column;gap:10px}
.faq-item{background:var(--white);border-radius:var(--radius);border:1px solid rgba(0,87,184,.10);overflow:hidden}
.faq-q{display:flex;justify-content:space-between;align-items:center;padding:18px 22px;cursor:pointer;font-weight:700;font-size:.91rem;gap:16px;color:var(--ink)}
.faq-icon{width:26px;height:26px;border-radius:7px;background:var(--blue-pale);display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:.3s}
.faq-icon svg{width:12px;height:12px;color:var(--blue);transition:transform .3s}
.faq-item.open .faq-icon{background:var(--blue)}
.faq-item.open .faq-icon svg{color:var(--white);transform:rotate(45deg)}
.faq-a{display:none;padding:0 22px 18px;font-size:.88rem;line-height:1.72;color:var(--slate);border-top:1px solid rgba(0,87,184,.07)}
.faq-item.open .faq-a{display:block}

/* ── FINAL CTA ── */
.final-cta{background:linear-gradient(135deg,var(--navy) 0%,var(--blue-dk) 50%,var(--navy-md) 100%);padding:96px 0;text-align:center;position:relative;overflow:hidden}
.final-cta::before{content:'';position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:700px;height:700px;border-radius:50%;background:radial-gradient(circle,rgba(0,180,216,.12) 0%,transparent 70%);pointer-events:none}
.final-cta .wrap{position:relative;z-index:2}
.final-cta h2{color:var(--white);margin-bottom:16px}
.final-cta .body-lt{max-width:500px;margin:0 auto 36px}
.cta-btns{display:flex;flex-wrap:wrap;gap:14px;justify-content:center;margin-bottom:16px}

/* ── FOOTER ── */
footer{background:var(--navy);padding:56px 0 0;color:rgba(255,255,255,.65)}
.footer-inner{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:48px;padding-bottom:44px;border-bottom:1px solid rgba(255,255,255,.07)}
.footer-logo{font-family:var(--font-display);font-size:1.3rem;font-weight:800;color:var(--white);margin-bottom:12px;letter-spacing:-.01em}
.footer-logo span{color:var(--cyan)}
.footer-tagline{font-size:.8rem;line-height:1.65;color:rgba(255,255,255,.38);max-width:240px;margin-top:8px}
.footer-col-title{font-size:.65rem;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:rgba(255,255,255,.28);margin-bottom:14px}
.footer-col ul{display:flex;flex-direction:column;gap:9px}
.footer-col ul a{font-size:.8rem;color:rgba(255,255,255,.48);transition:color .2s}
.footer-col ul a:hover{color:var(--white)}
.footer-disclaimer{padding:22px 0;font-size:.73rem;line-height:1.72;color:rgba(255,255,255,.28);border-top:1px solid rgba(255,255,255,.05)}
.footer-bottom{padding:18px 0;text-align:center}
.footer-copy{font-size:.73rem;color:rgba(255,255,255,.24);display:block;line-height:1.7}
.footer-copy a{color:var(--cyan)}

/* ── ANIMATIONS ── */
.fade-up{opacity:0;transform:translateY(24px);transition:opacity .6s ease,transform .6s ease}
.fade-up.visible{opacity:1;transform:none}

/* ── RESPONSIVE ── */
@media(max-width:960px){
  .hero-inner{grid-template-columns:1fr;gap:40px}
  .hero-right{order:-1}
  .hero-img-wrap img{max-width:220px}
  .hero-slab{width:100%;clip-path:none;opacity:.3}
  .certs-grid{grid-template-columns:repeat(2,1fr)}
  .about-inner{grid-template-columns:1fr}
  .about-img{display:none}
  .ing-grid{grid-template-columns:1fr}
  .reviews-grid{grid-template-columns:1fr}
  .howto-steps{grid-template-columns:1fr}
  .target-grid{grid-template-columns:1fr}
  .guarantee-inner{grid-template-columns:1fr}
  .guarantee-img{display:none}
  .footer-inner{grid-template-columns:1fr}
  .nav-links{display:none}
  .hamburger{display:flex}
}
@media(max-width:600px){
  .sec{padding:56px 0}
  .certs-grid{grid-template-columns:1fr 1fr}
  .hero-btns{flex-direction:column;align-items:flex-start}
  .cta-btns{flex-direction:column;align-items:center}
}