/* ============================================
   Yu Sleep — main.css
   Sections 4-21 + popup + footer + responsive
   ============================================ */

/* SECTION 4: Trust Strip */
.trust-strip{background:#fff;padding:22px 0;border-bottom:1px solid var(--border)}
.trust-row{display:flex;justify-content:space-between;align-items:center;gap:18px;flex-wrap:wrap}
.trust-badge{display:flex;align-items:center;gap:10px;color:var(--midnight);font-weight:600;font-size:13.5px}
.trust-icon{font-size:24px}

/* SECTION 5: Why Choose */
.why-section{padding:80px 0;background:var(--cream)}
.why-grid{display:grid;grid-template-columns:1fr 1.2fr;gap:55px;align-items:center}
.why-image img{border-radius:18px;box-shadow:0 18px 45px rgba(45,27,105,0.15)}
.why-content h2{font-size:clamp(1.7rem,3vw,2.3rem);margin-bottom:16px}
.section-lead{color:var(--mute);font-size:1.05rem;margin-bottom:20px;line-height:1.7}
.check-list{list-style:none}
.check-list li{padding:10px 0 10px 36px;position:relative;color:#312a52;line-height:1.55;font-size:15px;border-bottom:1px dashed #e7e3f5}
.check-list li:last-child{border-bottom:none}
.check-list li::before{content:"";position:absolute;left:0;top:13px;width:22px;height:22px;background:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%23f5b942'><path d='M12 2L9.5 8.5 2 9 7.5 13.5 6 21 12 17 18 21 16.5 13.5 22 9 14.5 8.5z'/></svg>") no-repeat center/contain}

/* SECTION 6: Problem section (dark) */
.problem-section{background:linear-gradient(180deg,#1a1340 0%,#2d1b69 100%);color:#fff;padding:80px 0}
.ai-block{background:rgba(107,78,230,0.15);border-left:4px solid var(--gold);padding:22px 26px;border-radius:10px;margin-bottom:40px;max-width:900px}
.ai-block h3{color:var(--gold);font-size:1.15rem;margin-bottom:8px;font-family:'Inter',sans-serif;font-weight:700}
.ai-block p{color:#dcd4f0;font-size:15px;line-height:1.65;margin:0}
.section-h2-light{color:#fff;font-size:clamp(1.7rem,3vw,2.3rem);text-align:center;margin-bottom:35px}
.pain-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;margin-top:30px}
.pain-card{background:rgba(255,255,255,0.04);border:1px solid rgba(245,185,66,0.18);padding:24px 22px;border-radius:14px;transition:transform 0.2s,border-color 0.2s}
.pain-card:hover{transform:translateY(-3px);border-color:var(--gold)}
.pain-num{color:var(--gold);font-family:'Fraunces',serif;font-size:1.5rem;font-weight:700;margin-bottom:8px}
.pain-card h4{color:#fff;font-size:1.05rem;margin-bottom:8px}
.pain-card p{color:#cdc3eb;font-size:13.5px;line-height:1.55}

/* SECTION 7: What Is */
.what-section{padding:80px 0;background:#fff}
.what-section .ai-block{background:#f5f1ff;border-left:4px solid var(--soft-purple)}
.what-section .ai-block h3{color:var(--deep-purple)}
.what-section .ai-block p{color:#3a3460}
.what-grid{display:grid;grid-template-columns:1.3fr 1fr;gap:55px;align-items:center;margin-top:30px}
.what-grid h2{font-size:clamp(1.7rem,3vw,2.3rem);margin-bottom:18px}
.what-grid p{color:#3a3460;font-size:15.5px;line-height:1.75;margin-bottom:14px}
.what-image img{border-radius:18px;box-shadow:0 18px 45px rgba(45,27,105,0.15)}

/* SECTION 8: How It Works */
.how-section{padding:80px 0;background:linear-gradient(180deg,#fdfbf4 0%,#f5f1ff 100%)}
.how-section .ai-block{background:#fff;border-left:4px solid var(--soft-purple);box-shadow:0 8px 25px rgba(45,27,105,0.06)}
.how-section .ai-block h3{color:var(--deep-purple)}
.how-section .ai-block p{color:#3a3460}
.section-h2-center{text-align:center;font-size:clamp(1.7rem,3vw,2.3rem);margin-bottom:14px}
.section-lead-center{text-align:center;color:var(--mute);max-width:680px;margin:0 auto 40px;font-size:1.02rem;line-height:1.65}
.mechanism-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.mech-card{background:#fff;padding:30px 24px;border-radius:16px;box-shadow:0 8px 25px rgba(45,27,105,0.08);transition:transform 0.2s,box-shadow 0.2s;border:1px solid var(--border)}
.mech-card:hover{transform:translateY(-4px);box-shadow:0 14px 35px rgba(45,27,105,0.13)}
.mech-icon{font-size:2rem;margin-bottom:12px}
.mech-card h4{font-size:1.1rem;margin-bottom:8px;color:var(--midnight)}
.mech-card p{color:var(--mute);font-size:14px;line-height:1.55}

/* SECTION 9: SVG Diagram */
.diagram-section{padding:80px 0;background:#fff}
.unique-label{display:inline-block;background:linear-gradient(90deg,#f5b942,#d99a1f);color:var(--midnight);font-weight:700;padding:6px 16px;border-radius:50px;font-size:11.5px;letter-spacing:0.6px;text-transform:uppercase;margin-bottom:14px}
.diagram-section .unique-label,
.timeline-section .unique-label,
.contra-section .unique-label{display:block;margin:0 auto 14px;text-align:center;max-width:fit-content}
.svg-wrap{background:linear-gradient(180deg,#fdfbf4,#f5f1ff);border-radius:22px;padding:30px;box-shadow:inset 0 2px 12px rgba(45,27,105,0.04)}
.svg-wrap svg{width:100%;height:auto;max-width:850px;margin:0 auto;display:block}

/* SECTION 10: Pricing */
.pricing-section{padding:80px 0;background:linear-gradient(180deg,#f5f1ff 0%,#fdfbf4 100%)}
.pricing-grid{display:grid;grid-template-columns:1fr 1fr 1fr;gap:24px;align-items:stretch;margin-top:40px}
.price-card{background:#fff;border-radius:20px;padding:30px 24px;border:2px solid var(--border);position:relative;display:flex;flex-direction:column;transition:transform 0.2s,box-shadow 0.2s}
.price-card:hover{transform:translateY(-4px);box-shadow:0 18px 40px rgba(45,27,105,0.1)}
.price-card-featured{transform:scale(1.05);border-color:var(--gold);box-shadow:0 18px 40px rgba(217,154,31,0.2);background:linear-gradient(180deg,#fff,#fffaf0)}
.price-card-featured:hover{transform:scale(1.07)}
.best-badge{position:absolute;top:-14px;left:50%;transform:translateX(-50%);background:linear-gradient(90deg,#f5b942,#d99a1f);color:var(--midnight);font-weight:700;padding:7px 22px;border-radius:50px;font-size:12px;letter-spacing:0.5px;white-space:nowrap;box-shadow:0 4px 14px rgba(217,154,31,0.35)}
.price-tag{background:#f5f1ff;color:var(--deep-purple);font-weight:700;padding:6px 12px;border-radius:8px;font-size:11.5px;letter-spacing:0.4px;align-self:flex-start;margin-bottom:10px}
.price-tag-gold{background:linear-gradient(90deg,#fff4d6,#fce4a4);color:var(--gold-deep)}
.price-card h3{font-size:1.3rem;margin-bottom:12px}
.price-img{display:flex;justify-content:center;align-items:center;margin:10px 0 16px;min-height:230px}
.price-img img{object-fit:contain;width:220px;height:220px}
.price-card-featured .price-img img{width:240px;height:240px}
.price-per{display:flex;align-items:baseline;justify-content:center;gap:8px;margin-bottom:6px}
.strike{text-decoration:line-through;color:#a39bc4;font-size:1.05rem}
.big-price{font-family:'Fraunces',serif;font-size:2.6rem;font-weight:700;color:var(--midnight)}
.big-price::before{content:"$";font-size:1.4rem;vertical-align:super;margin-right:2px;font-weight:600}
.per{color:var(--mute);font-size:14px}
.price-total{text-align:center;color:#4d4670;font-size:14px;margin-bottom:14px}
.price-total strong{color:var(--midnight);font-size:1.1rem}
.price-features{list-style:none;margin-bottom:18px;flex-grow:1}
.price-features li{padding:7px 0 7px 24px;position:relative;font-size:13.5px;color:#3a3460;line-height:1.45}
.price-features li::before{content:"✓";position:absolute;left:0;top:7px;color:var(--success);font-weight:700}
.btn-block{display:block;width:100%;text-align:center}
.btn-featured{background:linear-gradient(90deg,#f5b942,#d99a1f);box-shadow:0 6px 22px rgba(217,154,31,0.45)}

/* Bonuses */
.bonus-title{text-align:center;font-size:1.5rem;margin:60px 0 30px}
.bonus-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.bonus-card{background:#fff;border-radius:16px;padding:22px;text-align:center;border:1px solid var(--border);box-shadow:0 6px 18px rgba(45,27,105,0.05)}
.bonus-card img{margin:0 auto 14px;max-height:200px;object-fit:contain;border-radius:8px}
.bonus-card h4{font-size:1.02rem;margin-bottom:8px;line-height:1.3}
.bonus-card p{font-size:13.5px;color:var(--mute);line-height:1.5}
.bonus-card strong{color:var(--gold-deep)}

/* SECTION 11: Ingredients */
.ingredients-section{padding:80px 0;background:#fff}
.ingredients-section .ai-block{background:#f5f1ff;border-left:4px solid var(--soft-purple)}
.ingredients-section .ai-block h3{color:var(--deep-purple)}
.ingredients-section .ai-block p{color:#3a3460}
.ing-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:30px}
.ing-card{background:linear-gradient(180deg,#fdfbf4,#fff);padding:24px 22px;border-radius:14px;border:1px solid var(--border);transition:transform 0.2s,border-color 0.2s}
.ing-card:hover{transform:translateY(-3px);border-color:var(--soft-purple)}
.ing-tag{display:inline-block;background:#2d1b69;color:#f5b942;font-size:10.5px;font-weight:700;padding:4px 10px;border-radius:50px;letter-spacing:0.4px;text-transform:uppercase;margin-bottom:12px}
.ing-card h4{font-size:1.1rem;margin-bottom:6px;color:var(--midnight)}
.ing-card p{font-size:13.5px;color:var(--mute);line-height:1.55}

/* SECTION 12: Benefits */
.benefits-section{padding:80px 0;background:linear-gradient(180deg,#f5f1ff,#fdfbf4)}
.benefits-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:30px}
.benefit-card{background:#fff;padding:22px;border-radius:14px;text-align:center;box-shadow:0 6px 18px rgba(45,27,105,0.06);border:1px solid var(--border)}
.benefit-icon{font-size:2.2rem;margin-bottom:8px}
.benefit-card h4{font-size:1rem;margin-bottom:6px}
.benefit-card p{font-size:13px;color:var(--mute);line-height:1.5}

/* SECTION 13: Timeline */
.timeline-section{padding:80px 0;background:#fff}
.timeline-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;margin-top:30px;position:relative}
.timeline-grid::before{content:"";position:absolute;top:42px;left:8%;right:8%;height:2px;background:linear-gradient(90deg,#f5b942,#6b4ee6);z-index:0}
.timeline-card{background:#fff;padding:24px 22px;border-radius:14px;border:1px solid var(--border);box-shadow:0 6px 18px rgba(45,27,105,0.05);position:relative;z-index:1}
.tl-phase{display:inline-block;background:var(--midnight);color:var(--gold);font-weight:700;font-size:11.5px;padding:5px 12px;border-radius:50px;letter-spacing:0.4px;margin-bottom:10px}
.timeline-card h4{font-size:1.1rem;margin-bottom:8px}
.timeline-card p{font-size:13.5px;color:var(--mute);line-height:1.55}

/* SECTION 14: Comparison Table */
.compare-section{padding:80px 0;background:linear-gradient(180deg,#fdfbf4,#f5f1ff)}
.table-wrap{overflow-x:auto;background:#fff;border-radius:16px;box-shadow:0 8px 30px rgba(45,27,105,0.08);margin-top:30px}
.compare-table{width:100%;border-collapse:collapse;min-width:600px}
.compare-table th,.compare-table td{padding:16px 20px;text-align:left;border-bottom:1px solid var(--border);font-size:14px}
.compare-table th{background:var(--midnight);color:#fff;font-weight:600;font-size:13.5px}
.compare-table th.hl{background:linear-gradient(135deg,#f5b942,#d99a1f);color:var(--midnight)}
.compare-table td.hl{background:#fff8e8;color:var(--midnight);font-weight:700}
.compare-table tbody tr:hover{background:#fdfbf4}

/* SECTION 15: Reviews */
.reviews-section{padding:80px 0;background:#fff}
.reviews-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:30px}
.review-card{background:#fdfbf4;padding:26px 24px;border-radius:16px;border:1px solid var(--border);display:flex;flex-direction:column}
.review-stars{color:var(--gold);font-size:1.15rem;margin-bottom:12px;letter-spacing:1px}
.review-head{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.review-head img{width:54px;height:54px;border-radius:50%;object-fit:cover;border:3px solid var(--gold)}
.review-head strong{display:block;font-size:14.5px;color:var(--midnight)}
.verified{display:inline-block;color:var(--success);font-size:11px;font-weight:600;margin-top:2px}
.review-card p{color:#3a3460;font-size:14px;line-height:1.6;font-style:italic;flex-grow:1;margin-bottom:10px}
.review-card small{color:var(--mute);font-size:12px}

/* SECTION 16: Guarantee */
.guarantee-section{padding:80px 0;background:linear-gradient(135deg,#1a1340,#2d1b69);color:#fff}
.guarantee-grid{display:grid;grid-template-columns:1fr 1.7fr;gap:50px;align-items:center}
.seal{display:flex;justify-content:center}
.seal-inner{width:240px;height:240px;border-radius:50%;background:conic-gradient(from 0deg,#f5b942,#d99a1f,#f5b942,#d99a1f,#f5b942);padding:8px;position:relative;display:flex;align-items:center;justify-content:center;animation:rotate 20s linear infinite}
@keyframes rotate{to{transform:rotate(360deg)}}
.seal-center{position:absolute;top:8px;left:8px;right:8px;bottom:8px;background:var(--midnight);border-radius:50%;display:flex;flex-direction:column;align-items:center;justify-content:center;animation:counter-rotate 20s linear infinite}
@keyframes counter-rotate{to{transform:rotate(-360deg)}}
.seal-num,.seal-day,.seal-text{text-align:center}
.seal-num{font-family:'Fraunces',serif;font-size:3.6rem;font-weight:700;color:var(--gold);line-height:1}
.seal-day{color:var(--gold);font-weight:700;font-size:0.95rem;letter-spacing:2px;margin-bottom:4px}
.seal-text{color:#fff;font-size:10.5px;letter-spacing:1.2px;font-weight:600;line-height:1.4}
.guarantee-grid h2{color:#fff;font-size:clamp(1.7rem,3vw,2.3rem);margin-bottom:14px}
.guarantee-grid p{color:#dcd4f0;font-size:1.02rem;line-height:1.7;margin-bottom:14px}

/* SECTION 17: Contraindications */
.contra-section{padding:80px 0;background:#fff}
.contra-list{list-style:none;max-width:780px;margin:30px auto 0}
.contra-list li{padding:14px 0 14px 0;border-bottom:1px solid var(--border);color:#3a3460;font-size:15px;line-height:1.6}
.contra-list li:last-child{border-bottom:none}
.contra-list strong{color:var(--midnight)}
.contra-note{text-align:center;max-width:680px;margin:24px auto 0;color:var(--mute);font-style:italic;font-size:14px}

/* SECTION 18: FAQ */
.faq-section{padding:80px 0;background:linear-gradient(180deg,#f5f1ff,#fdfbf4)}
.faq-section .ai-block{background:#fff;border-left:4px solid var(--soft-purple);box-shadow:0 8px 25px rgba(45,27,105,0.06)}
.faq-section .ai-block h3{color:var(--deep-purple)}
.faq-section .ai-block p{color:#3a3460}
.faq-list{max-width:820px;margin:30px auto 0}
.faq-item{background:#fff;border-radius:12px;border:1px solid var(--border);margin-bottom:12px;overflow:hidden;transition:box-shadow 0.2s}
.faq-item[open]{box-shadow:0 8px 25px rgba(45,27,105,0.08)}
.faq-item summary{padding:18px 24px;font-weight:600;color:var(--midnight);cursor:pointer;font-size:15px;list-style:none;position:relative;padding-right:50px}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";position:absolute;right:24px;top:50%;transform:translateY(-50%);font-size:1.5rem;color:var(--soft-purple);font-weight:300;transition:transform 0.2s}
.faq-item[open] summary::after{content:"−"}
.faq-item p{padding:0 24px 20px;color:#3a3460;font-size:14.5px;line-height:1.65;margin:0}

/* SECTION 19: Research */
.research-section{padding:70px 0;background:#fff}
.research-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;margin-top:30px}
.research-stat{text-align:center;padding:30px 20px;background:linear-gradient(180deg,#fdfbf4,#f5f1ff);border-radius:14px;border:1px solid var(--border)}
.stat-num{font-family:'Fraunces',serif;font-size:2.6rem;font-weight:700;color:var(--gold-deep);line-height:1;margin-bottom:6px}
.stat-label{color:var(--midnight);font-weight:600;font-size:14px}

/* SECTION 20: References */
.refs-section{padding:70px 0;background:#fdfbf4}
.ref-list{max-width:820px;margin:30px auto 0;padding-left:24px}
.ref-list li{padding:10px 0;color:#3a3460;font-size:14px;line-height:1.65;border-bottom:1px dashed var(--border)}
.ref-list li:last-child{border-bottom:none}
.ref-list a{color:var(--soft-purple);font-weight:600}
.ref-list a:hover{text-decoration:underline}

/* SECTION 21: Final CTA + Footer */
.final-cta{padding:70px 0;background:linear-gradient(135deg,#1a1340,#2d1b69);color:#fff;text-align:center}
.final-cta-img{display:flex;justify-content:center;margin-bottom:24px}
.final-cta-img img{max-width:380px;width:100%;height:auto;filter:drop-shadow(0 20px 40px rgba(0,0,0,0.4))}
.final-cta h2{color:#fff;font-size:clamp(1.7rem,3vw,2.3rem);margin-bottom:14px}
.final-cta p{color:#dcd4f0;font-size:1.08rem;margin-bottom:24px}

.footer{background:#0f0a2e;color:#cdc3eb;padding:60px 0 24px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px;margin-bottom:35px}
.logo-footer{font-family:'Fraunces',serif;font-weight:700;font-size:1.5rem;color:#fff;margin-bottom:8px}
.footer-tag{color:#a39bc4;font-size:14px}
.footer h5{color:#fff;font-size:14px;margin-bottom:14px;text-transform:uppercase;letter-spacing:0.8px}
.footer ul{list-style:none}
.footer ul li{margin-bottom:8px}
.footer ul a{color:#cdc3eb;font-size:13.5px;transition:color 0.2s}
.footer ul a:hover{color:var(--gold)}
.footer a{color:#cdc3eb}
.footer-disclaimer{border-top:1px solid #2a224d;padding-top:24px;font-size:12px;color:#8579b8;line-height:1.65}
.copyright{margin-top:12px;color:#6d5fa3}

/* Mobile sticky CTA */
.mobile-sticky-cta{display:none;position:fixed;bottom:14px;left:14px;right:14px;background:linear-gradient(90deg,#f5b942,#d99a1f);color:var(--midnight);font-weight:700;text-align:center;padding:15px;border-radius:50px;font-size:15px;box-shadow:0 8px 25px rgba(0,0,0,0.25);z-index:50}

/* Social proof popup */
.social-popup{position:fixed;bottom:20px;left:20px;background:#fff;border-radius:14px;box-shadow:0 12px 35px rgba(0,0,0,0.2);padding:18px 22px 18px 18px;max-width:340px;border:1px solid var(--border);transform:translateX(-110%);transition:transform 0.4s cubic-bezier(.5,1.5,.5,1);z-index:90}
.social-popup.show{transform:translateX(0)}
.popup-close{position:absolute;top:6px;right:8px;background:none;border:none;font-size:1.3rem;color:#a39bc4;cursor:pointer;line-height:1;padding:4px 8px}
.popup-close:hover{color:var(--ink)}
.popup-stars{color:var(--gold);font-size:0.95rem;letter-spacing:1px;margin-bottom:6px}
.popup-text{color:#3a3460;font-size:13.5px;line-height:1.5;font-style:italic;margin-bottom:6px}
.popup-author{color:var(--mute);font-size:12px;font-weight:600}

/* ============================================
   Responsive: 900px
   ============================================ */
@media (max-width:900px){
.container{padding:0 16px}
.why-grid,.what-grid,.guarantee-grid{grid-template-columns:1fr;gap:35px}
.why-image,.what-image{max-width:380px;margin:0 auto}
.pain-grid{grid-template-columns:repeat(2,1fr)}
.mechanism-grid{grid-template-columns:repeat(2,1fr)}
.pricing-grid{grid-template-columns:1fr;gap:20px}
.price-card-featured{transform:scale(1);order:-1}
.price-card-featured:hover{transform:scale(1.02)}
.bonus-grid{grid-template-columns:1fr}
.ing-grid{grid-template-columns:repeat(2,1fr)}
.benefits-grid{grid-template-columns:repeat(2,1fr)}
.timeline-grid{grid-template-columns:repeat(2,1fr)}
.timeline-grid::before{display:none}
.reviews-grid{grid-template-columns:1fr}
.research-grid{grid-template-columns:repeat(2,1fr)}
.footer-grid{grid-template-columns:1fr 1fr;gap:30px}
.mobile-sticky-cta{display:block}
body{padding-bottom:74px}
.social-popup{left:14px;right:14px;max-width:none;bottom:80px}
}

/* ============================================
   Responsive: 560px
   ============================================ */
@media (max-width:560px){
.announcement{font-size:11.5px}
.btn{padding:11px 22px;font-size:14px}
.btn-lg{padding:14px 28px;font-size:15px}
.trust-row{gap:12px;justify-content:flex-start}
.trust-badge{font-size:12px}
.trust-icon{font-size:20px}
.pain-grid,.mechanism-grid,.ing-grid,.benefits-grid,.timeline-grid,.research-grid{grid-template-columns:1fr}
.footer-grid{grid-template-columns:1fr;gap:25px}
.hero h1{font-size:1.65rem}
.section-h2-light,.section-h2-center{font-size:1.45rem}
.what-grid h2,.why-content h2,.guarantee-grid h2,.final-cta h2{font-size:1.45rem}
.seal-inner{width:200px;height:200px}
.seal-inner::before{width:184px;height:184px}
.seal-num{font-size:3.2rem}
.price-card{padding:24px 20px}
.big-price{font-size:2.3rem}
.faq-item summary{padding:14px 50px 14px 18px;font-size:14px}
}