/* ── Reset ── */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
img{max-width:100%;display:block}
button{cursor:pointer;font-family:inherit}
a{text-decoration:none;color:inherit}
ul{list-style:none}

/* ── Base ── */
body{
  font-family:'Inter',sans-serif;
  font-size:16px;
  font-weight:400;
  color:rgb(33,37,41);
  line-height:1.5;
  background:#fff;
  -webkit-font-smoothing:antialiased;
  padding-bottom:80px;
}

/* ── Utilities ── */
.container{max-width:1360px;margin:0 auto;padding:0 20px}
@media(min-width:768px){.container{padding:0 40px}}

/* ── Section Spacing ── */
.section{padding:48px 0}
@media(min-width:768px){.section{padding:80px 0}}

/* ════════════════════════════════════════
   1. NAV
   ════════════════════════════════════════ */
.nav{
  background:#fff;
  border-bottom:1px solid #eee;
  padding:16px 0;
  position:sticky;top:0;z-index:100;
}
.nav .container{display:flex;align-items:center;justify-content:space-between}
.nav-brand{
  font-family:'Playfair Display',serif;
  font-size:22px;font-weight:600;color:rgb(34,32,47);
  letter-spacing:0.5px;
}
.nav-links{display:flex;gap:28px;list-style:none}
.nav-links a{font-size:14px;font-weight:500;color:rgb(33,37,41);letter-spacing:0.3px;transition:color .2s}
.nav-links a:hover{color:rgb(0,128,120)}
@media(max-width:767px){.nav-links{display:none}}

/* ════════════════════════════════════════
   2. PDP HERO
   ════════════════════════════════════════ */
.pdp-hero{padding:36px 0 48px}
@media(min-width:768px){.pdp-hero{padding:36px 0}}

.product-grid{display:flex;flex-direction:column;gap:0}
@media(min-width:768px){
  .product-grid{flex-direction:row}
  .left-col{max-width:55%;flex:0 0 55%;position:sticky;top:80px;align-self:flex-start}
  .right-col{max-width:45%;flex:0 0 45%;padding-left:50px}
}

/* Carousel */
.carousel-container{position:relative;overflow:hidden;border-radius:4px;background:#fafafa}
.carousel-track{display:flex;transition:transform .4s ease}
.carousel-slide{min-width:100%;position:relative}
.carousel-slide img{width:100%;aspect-ratio:1/1;object-fit:cover}
.carousel-dots{display:flex;justify-content:center;gap:6px;padding:14px 0}
.carousel-dot{
  width:24px;height:6px;border-radius:3px;border:none;
  background:#ccc;transition:all .3s;cursor:pointer;padding:0;
}
.carousel-dot.active{width:36px;background:rgb(18,18,18)}
.thumb-strip{display:flex;gap:8px;padding:8px 0}
.thumb-strip button{
  flex:1;border:2px solid transparent;border-radius:4px;
  padding:0;background:none;overflow:hidden;opacity:.5;transition:all .3s;
}
.thumb-strip button.active{border-color:rgb(115,85,110);opacity:1}
.thumb-strip button img{width:100%;aspect-ratio:1/1;object-fit:cover}

/* Product Info */
.product-info{max-width:600px}
.brand-label{
  font-size:13px;font-weight:600;letter-spacing:1.5px;text-transform:uppercase;
  color:rgb(0,128,120);margin-bottom:8px;
}
.star-rating{display:flex;align-items:center;gap:6px;margin-bottom:10px}
.stars{color:rgb(115,85,110);font-size:16px;letter-spacing:2px}
.star-text{font-size:14px;color:rgb(100,100,100)}
.product-subtitle{
  font-size:20px;font-weight:400;color:rgb(33,37,41);
  line-height:1.4;margin-bottom:10px;
}
@media(min-width:768px){.product-subtitle{font-size:26px;line-height:30px}}
.product-title{
  font-family:'Playfair Display',serif;
  font-size:32px;font-weight:400;color:rgb(34,32,47);
  letter-spacing:0.78px;line-height:1.2;margin-bottom:14px;
}
@media(min-width:768px){.product-title{font-size:36px;line-height:1.2;margin-bottom:8px}}

.trust-badges-line{
  display:flex;flex-wrap:wrap;gap:8px 14px;
  font-size:10px;font-weight:600;letter-spacing:1.2px;text-transform:uppercase;
  color:rgb(100,100,100);margin-bottom:16px;padding:8px 0;
  border-top:1px solid #eee;border-bottom:1px solid #eee;
}
.trust-badges-line span{white-space:nowrap}

.product-description{
  font-size:15px;line-height:1.65;color:rgb(55,55,55);margin-bottom:20px;
}
.product-description a{color:rgb(0,128,120);text-decoration:underline}

/* Benefit Bullets */
.benefit-bullets{margin-bottom:24px}
.benefit-bullet{
  display:flex;align-items:flex-start;gap:10px;
  padding:10px 0;border-bottom:1px solid #eee;
  font-size:15px;line-height:1.5;color:rgb(33,37,41);
}
.benefit-bullet:last-child{border-bottom:none}
.benefit-check{color:rgb(0,128,120);font-size:18px;flex-shrink:0;margin-top:1px}

/* Duration Tabs */
.duration-tabs{display:flex;gap:10px;margin-bottom:18px}
.duration-tab{
  flex:1;position:relative;
  border:1px solid #ddd;border-radius:8px;
  padding:16px 10px 12px;text-align:center;
  background:#fff;cursor:pointer;transition:all .2s;
}
.duration-tab.active{border-color:rgb(34,32,47);background:rgb(250,250,250)}
.duration-tab-label{font-size:13px;font-weight:600;letter-spacing:0.4px;color:rgb(33,37,41)}
.duration-tab-price{font-size:12px;color:rgb(100,100,100);margin-top:4px}
.best-value-badge{
  position:absolute;top:-10px;left:50%;transform:translateX(-50%);
  background:rgb(27,27,51);color:#fff;
  font-size:11px;font-weight:500;text-transform:uppercase;letter-spacing:0.5px;
  padding:4px 10px;border-radius:60px;white-space:nowrap;
}

/* Purchase Cards */
.purchase-container{display:flex;flex-direction:column;gap:10px;margin-bottom:18px}
.purchase-card{
  display:flex;flex-direction:column;gap:7px;
  padding:17.6px;border-radius:8px;cursor:pointer;transition:all .2s;
}
.purchase-card{background:#fff;border:1px solid rgb(195,207,217)}
.purchase-card-header{display:flex;align-items:center;flex-wrap:wrap;gap:8px}
.purchase-radio{
  width:20px;height:20px;border-radius:50%;border:2px solid rgb(61,61,61);
  display:flex;align-items:center;justify-content:center;flex-shrink:0;
}
.purchase-radio .dot{width:10px;height:10px;border-radius:50%;background:rgb(34,32,47);display:none}
.purchase-card.active .purchase-radio .dot{display:block}
.purchase-label{font-size:16px;font-weight:500;color:#000}
@media(min-width:768px){.purchase-label{font-size:20px}}
.discount-badge{
  background:rgb(42,93,132);color:#fff;
  font-size:14px;padding:3px 10px;border-radius:50px;
  text-transform:uppercase;white-space:nowrap;
}
.purchase-price{font-size:16px;font-weight:600;color:rgb(33,37,41)}
.purchase-detail{font-size:12px;color:rgb(80,80,80);font-weight:600}
.purchase-sublabel{font-size:13px;color:rgb(80,80,80)}
.original-price{text-decoration:line-through;color:rgb(150,150,150);margin-left:6px;font-weight:400}

/* ATC Button */
.atc-button{
  display:flex;align-items:center;justify-content:center;
  width:100%;
  border:2px solid rgb(115,85,110);
  background:rgb(115,85,110);
  color:#fff;
  font-size:18px;font-weight:500;
  letter-spacing:1px;text-transform:capitalize;
  padding:14px 10px;border-radius:10px;
  transition:all .3s;margin-bottom:12px;
  text-decoration:none;
}
.atc-button:hover{background:rgb(95,65,90);color:#fff}
@media(min-width:768px){.atc-button{font-size:20px}}

.urgency-text{
  text-align:center;font-size:12px;color:rgb(128,128,128);
  letter-spacing:0.3px;padding:0 6px;
}

/* ════════════════════════════════════════
   3. SOCIAL PROOF BAR
   ════════════════════════════════════════ */
.social-proof{background:rgb(248,248,250);overflow:visible}
.social-proof-title{
  text-align:center;font-size:14px;font-weight:600;
  text-transform:uppercase;letter-spacing:2px;color:rgb(100,100,100);
  margin-bottom:28px;
}
.proof-scroll{
  display:flex;gap:16px;overflow-x:auto;padding:0 20px 16px;
  -webkit-overflow-scrolling:touch;scroll-snap-type:x mandatory;
}
.proof-scroll::-webkit-scrollbar{display:none}
.proof-card{
  flex:0 0 280px;scroll-snap-align:start;
  background:#fff;border-radius:12px;padding:20px;
  box-shadow:0 2px 12px rgba(0,0,0,0.06);
}
@media(min-width:768px){.proof-card{flex:0 0 340px}}
@media(max-width:767px){
  .proof-scroll{flex-wrap:wrap;overflow-x:visible;padding:0 16px;gap:12px;}
  .proof-card{flex:1 1 100%;min-width:0;}
}
@media(max-width:600px){
  .social-proof .container > div[style*="grid-template-columns"]{grid-template-columns:1fr !important;gap:12px !important;}
}
.proof-quote{
  font-family:'Playfair Display',serif;
  font-size:15px;font-style:italic;line-height:1.6;
  color:rgb(34,32,47);margin-bottom:16px;
}
.proof-author{font-size:14px;font-weight:700;color:rgb(34,32,47)}
.proof-cred{font-size:12px;color:rgb(100,100,100);margin-top:2px}

/* ════════════════════════════════════════
   4. CONCERNS SECTION
   ════════════════════════════════════════ */
.concerns{background:#fff}
.section-heading{
  font-family:'Playfair Display',serif;
  font-size:28px;font-weight:500;color:rgb(34,32,47);
  text-align:center;margin-bottom:12px;line-height:1.3;
}
@media(min-width:768px){.section-heading{font-size:38px}}
.section-subheading{
  text-align:center;font-size:16px;color:rgb(100,100,100);
  margin-bottom:36px;max-width:560px;margin-left:auto;margin-right:auto;line-height:1.5;
}
.concerns-grid{display:grid;grid-template-columns:1fr;gap:20px}
@media(min-width:600px){.concerns-grid{grid-template-columns:1fr 1fr}}
.concern-card{border-radius:12px;overflow:hidden;background:#fafafa}
.concern-card img{width:100%;aspect-ratio:4/3;object-fit:cover}
.concern-card p{
  padding:16px 20px;font-size:16px;font-weight:500;
  color:rgb(34,32,47);line-height:1.45;
}

/* ════════════════════════════════════════
   5. VALUE PROP
   ════════════════════════════════════════ */
.value-prop{background:rgb(248,248,250)}
.value-grid{display:flex;flex-direction:column;gap:32px;align-items:center}
@media(min-width:768px){.value-grid{flex-direction:row;gap:60px}}
.value-text{flex:1}
.value-text h2{
  font-family:'Playfair Display',serif;
  font-size:28px;font-weight:500;color:rgb(34,32,47);
  margin-bottom:16px;line-height:1.3;
}
@media(min-width:768px){.value-text h2{font-size:36px}}
.value-text p{font-size:16px;line-height:1.7;color:rgb(55,55,55);margin-bottom:14px}
.value-text .highlight{
  display:inline-block;background:rgb(42,93,132);color:#fff;
  font-size:13px;font-weight:600;padding:6px 14px;border-radius:50px;
  text-transform:uppercase;letter-spacing:0.5px;margin-top:4px;
}
.value-image{flex:1;max-width:100%}
.value-image img{border-radius:12px;width:100%;aspect-ratio:4/3;object-fit:cover}

/* ════════════════════════════════════════
   6. PRESS LOGOS
   ════════════════════════════════════════ */
.press-bar{background:#fff;text-align:center}
.press-label{
  font-size:12px;font-weight:600;text-transform:uppercase;
  letter-spacing:2px;color:rgb(150,150,150);margin-bottom:24px;
}
.press-logos{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:center;
  gap:24px 40px;
}
.press-logo{
  font-family:'Inter',sans-serif;
  font-size:22px;font-weight:800;
  color:rgb(34,32,47);opacity:0.2;
  letter-spacing:1px;text-transform:uppercase;
  user-select:none;white-space:nowrap;
}
@media(min-width:768px){.press-logo{font-size:28px}}

/* ════════════════════════════════════════
   7. SCIENCE SECTION
   ════════════════════════════════════════ */
.science{background:#fff}
.science-cards{display:grid;grid-template-columns:1fr;gap:24px}
@media(min-width:700px){.science-cards{grid-template-columns:repeat(3,1fr)}}
.science-card{border-radius:12px;overflow:hidden;background:#fafafa;box-shadow:0 2px 10px rgba(0,0,0,0.05)}
.science-card img{width:100%;aspect-ratio:3/2;object-fit:cover}
.science-card-body{padding:20px}
.science-card-body h3{
  font-family:'Playfair Display',serif;
  font-size:20px;font-weight:500;color:rgb(34,32,47);margin-bottom:8px;
}
.science-card-body p{font-size:14px;line-height:1.6;color:rgb(80,80,80)}

/* ════════════════════════════════════════
   8. WHAT NAD+ RESTORES
   ════════════════════════════════════════ */
.restores{background:#eef3ed}
.restores-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}
@media(min-width:700px){.restores-grid{grid-template-columns:repeat(4,1fr)}}
.restore-item{text-align:center;padding:20px 12px}
.restore-icon{font-size:36px;margin-bottom:12px}
.restore-item h4{
  font-size:16px;font-weight:600;color:rgb(34,32,47);margin-bottom:6px;
}
.restore-item p{font-size:13px;line-height:1.5;color:rgb(80,80,80)}

/* ════════════════════════════════════════
   9. DOCTOR SECTION
   ════════════════════════════════════════ */
.doctor-section{background:rgb(248,248,250)}
.doctor-inner{
  display:flex;align-items:center;gap:20px;
  max-width:700px;margin:0 auto;
}
.doctor-avatar{
  width:60px;height:60px;border-radius:50%;object-fit:cover;flex-shrink:0;
}
.doctor-text{flex:1}
.doctor-text p{font-size:15px;line-height:1.6;color:rgb(55,55,55);margin-bottom:8px}
.doctor-text .doctor-quote{
  font-style:italic;font-size:15px;color:rgb(80,80,80);
}
@media(max-width:767px){
  .doctor-text p{font-size:14px}
  .doctor-text .doctor-quote{font-size:14px}
}

/* ════════════════════════════════════════
   10. NMN vs NAD+ COMPARISON
   ════════════════════════════════════════ */
.comparison{background:#fff}
.compare-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;max-width:800px;margin:0 auto}
.compare-card{
  border-radius:12px;padding:28px 24px;text-align:center;
}
.compare-card.nad{background:rgb(238,243,237);border:2px solid rgb(0,128,120)}
.compare-card.nmn{background:rgb(248,248,250);border:2px solid #ddd}
.compare-card h3{
  font-family:'Playfair Display',serif;
  font-size:22px;font-weight:500;margin-bottom:16px;color:rgb(34,32,47);
}
.compare-card ul{text-align:left;font-size:14px;line-height:1.8;color:rgb(55,55,55)}
.compare-card ul li{padding-left:4px;margin-bottom:4px}
.compare-card ul li::before{margin-right:6px}
.compare-card.nad ul li::before{content:"✓";color:rgb(0,128,120);font-weight:700}
.compare-card.nmn ul li::before{content:"✗";color:rgb(180,60,60);font-weight:700}
.compare-verdict{
  text-align:center;margin-top:20px;
  font-size:14px;color:rgb(100,100,100);font-weight:500;
}

/* ════════════════════════════════════════
   11. TRANSFORMATION
   ════════════════════════════════════════ */
.transformation{position:relative;overflow:hidden}
.transformation-img{
  width:100%;aspect-ratio:16/7;object-fit:cover;
  filter:brightness(0.7);
}
@media(max-width:767px){.transformation-img{aspect-ratio:16/9}}
.transformation-overlay{
  position:absolute;inset:0;display:flex;flex-direction:column;
  align-items:center;justify-content:center;text-align:center;
  padding:40px 24px;color:#fff;
}
.transformation-overlay h2{
  font-family:'Playfair Display',serif;
  font-size:28px;font-weight:500;margin-bottom:14px;line-height:1.3;
}
@media(min-width:768px){.transformation-overlay h2{font-size:40px}}
.transformation-overlay p{
  font-size:16px;line-height:1.6;max-width:600px;opacity:0.9;margin-bottom:20px;
}
.transformation-overlay .cta-btn{
  display:inline-block;background:#fff;color:rgb(34,32,47);
  font-size:15px;font-weight:600;padding:12px 32px;border-radius:8px;
  transition:all .2s;text-decoration:none;
}
.transformation-overlay .cta-btn:hover{background:rgb(0,128,120);color:#fff}

/* ════════════════════════════════════════
   12. HOW IT WORKS
   ════════════════════════════════════════ */
.how-it-works{background:rgb(27,27,51);color:#fff}
.how-it-works .section-heading{color:#fff}
.how-it-works .section-subheading{color:rgba(255,255,255,0.6)}
.steps{display:grid;grid-template-columns:1fr;gap:24px;max-width:900px;margin:0 auto}
@media(min-width:700px){.steps{grid-template-columns:repeat(3,1fr)}}
.step{text-align:center;padding:24px 16px}
.step-num{
  display:inline-flex;align-items:center;justify-content:center;
  width:48px;height:48px;border-radius:50%;
  background:rgba(255,255,255,0.1);border:1px solid rgba(255,255,255,0.2);
  font-size:20px;font-weight:600;color:rgb(0,200,190);margin-bottom:16px;
}
.step h3{font-size:18px;font-weight:600;margin-bottom:8px}
.step p{font-size:14px;line-height:1.6;color:rgba(255,255,255,0.7)}

/* ════════════════════════════════════════
   13. REVIEWS
   ════════════════════════════════════════ */
.reviews{background:#fff}
.review-list{max-width:800px;margin:0 auto;display:flex;flex-direction:column;gap:16px}
.review-card{
  background:rgb(243,244,246);
  border-radius:8px;padding:20px 24px;
  box-shadow:rgba(0,0,0,0.15) 0 0 10px;
}
.review-stars{color:rgb(115,85,110);font-size:14px;letter-spacing:2px;margin-bottom:8px}
.review-text{font-size:15px;line-height:1.6;color:rgb(55,55,55);margin-bottom:10px}
.review-author{font-size:14px;font-weight:700;color:rgb(33,37,41)}
.review-meta{font-size:12px;color:rgb(128,128,128);margin-top:2px}

/* ════════════════════════════════════════
   14. FAQ
   ════════════════════════════════════════ */
.faq{background:rgb(248,248,250)}
.faq-list{max-width:760px;margin:0 auto;display:flex;flex-direction:column;gap:10px}
.faq-item{
  border:1px solid #ddd;border-radius:8px;background:#fff;overflow:hidden;
}
.faq-question{
  display:flex;align-items:center;justify-content:space-between;
  padding:18px 20px;cursor:pointer;font-size:15px;font-weight:600;
  color:rgb(34,32,47);gap:12px;
}
.faq-question:hover{background:rgb(250,250,250)}
.faq-chevron{
  font-size:18px;transition:transform .3s;flex-shrink:0;color:rgb(150,150,150);
}
.faq-item.open .faq-chevron{transform:rotate(180deg)}
.faq-answer{
  display:none;padding:0 20px 18px;
  font-size:14px;line-height:1.7;color:rgb(80,80,80);
}
.faq-item.open .faq-answer{display:block}

/* ════════════════════════════════════════
   15. FINAL CTA
   ════════════════════════════════════════ */
.final-cta{background:#fff;text-align:center}
.final-cta h2{
  font-family:'Playfair Display',serif;
  font-size:28px;font-weight:500;color:rgb(34,32,47);margin-bottom:16px;line-height:1.3;
}
@media(min-width:768px){.final-cta h2{font-size:40px}}
.final-cta p{font-size:16px;color:rgb(100,100,100);margin-bottom:24px;line-height:1.5}
.final-cta .cta-main{
  display:inline-block;
  background:rgb(115,85,110);color:#fff;
  font-size:18px;font-weight:600;padding:16px 48px;border-radius:10px;
  transition:all .2s;text-decoration:none;letter-spacing:0.5px;
}
.final-cta .cta-main:hover{background:rgb(95,65,90)}
.final-cta .trust-line{
  font-size:12px;color:rgb(150,150,150);margin-top:14px;
}

/* ════════════════════════════════════════
   17. STICKY BOTTOM CTA (mobile only)
   ════════════════════════════════════════ */
.sticky-cta{
  display:none;position:fixed;bottom:0;left:0;right:0;z-index:999;
  background:#fff;padding:12px 16px;
  box-shadow:0 -2px 16px rgba(0,0,0,0.1);
  border-top:1px solid #eee;
}
.sticky-cta a{
  display:block;max-width:480px;margin:0 auto;text-align:center;
  background:rgb(115,85,110);color:#fff;
  font-size:16px;font-weight:600;padding:14px;border-radius:8px;
  text-decoration:none;letter-spacing:0.5px;
}
.sticky-cta.visible{display:block}

/* Celebrity quote responsive */
@media(max-width:767px){
  .proof-quote-text{font-size:17px !important}
}

/* Mobile top CTA */
.mobile-top-cta{
  display:none;
  position:fixed;top:0;left:0;right:0;z-index:101;
  background:rgb(115,85,110);
  padding:8px 16px;
  text-align:center;
}
.mobile-top-cta a{
  color:#fff;font-size:14px;font-weight:600;
  text-decoration:none;letter-spacing:0.5px;
}
@media(max-width:767px){
  .mobile-top-cta.visible{display:block}
  .nav{position:static}
}