/* =========================================================
   Air-C Compression Massager — Design System
   Classic apothecary-meets-clinic palette:
   deep navy text, sky-blue "bottle" tones, warm-gold CTA,
   crisp white strips. Serif display + clean sans body.
   ========================================================= */

@import url('https://fonts.googleapis.com/css2?family=Lora:ital,wght@0,500;0,600;0,700;1,500&family=Source+Sans+3:wght@400;500;600;700&display=swap');

:root{
  --navy:#0f2742;
  --navy-soft:#3a5674;
  --sky-light:#c7e4ff;
  --sky:#e8f4ff;
  --blue:#2889f3;
  --blue-deep:#1668c9;
  --gold:#ffc72c;
  --gold-deep:#e8a800;
  --white:#ffffff;
  --paper:#fbfdff;
  --line:#d8e8fb;
  --shadow: 0 20px 45px -20px rgba(15,39,66,.25);
  --radius-lg: 22px;
  --radius-md: 14px;
  --radius-sm: 8px;
  --serif: 'Lora', Georgia, 'Times New Roman', serif;
  --sans: 'Source Sans 3', -apple-system, Segoe UI, Roboto, sans-serif;
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--sans);
  color:var(--navy);
  background:var(--paper);
  font-size:18px;
  line-height:1.7;
}
img{max-width:100%;display:block;}
a{color:var(--blue-deep);}
h1,h2,h3,h4{
  font-family:var(--serif);
  color:var(--navy);
  line-height:1.25;
  margin:0 0 .6em;
}
h1{font-size:clamp(2.1rem,4vw,3.2rem);}
h2{font-size:clamp(1.5rem,2.6vw,2.1rem);}
h3{font-size:1.3rem;}
p{margin:0 0 1.1em;}
.container{max-width:1180px;margin:0 auto;padding:0 24px;}
.section{padding:72px 0;}
.section--tint{background:var(--sky);}
.section--white{background:var(--white);}
.eyebrow{
  display:inline-block;
  font-family:var(--sans);
  font-weight:700;
  letter-spacing:.14em;
  text-transform:uppercase;
  font-size:.78rem;
  color:var(--blue-deep);
  background:var(--sky-light);
  padding:6px 14px;
  border-radius:999px;
  margin-bottom:16px;
}
.lede{font-size:1.15rem;color:var(--navy-soft);}

/* ---------- Header / strip ---------- */
.top-strip{
  background:var(--white);
  border-bottom:1px solid var(--line);
  position:sticky;top:0;z-index:50;
}
.top-strip .container{
  display:flex;align-items:center;justify-content:space-between;
  padding-top:14px;padding-bottom:14px;
}
.brand{
  font-family:var(--serif);
  font-weight:700;font-size:1.35rem;color:var(--navy);
  text-decoration:none;display:flex;align-items:center;gap:10px;
}
.brand span.badge{
  width:34px;height:34px;border-radius:50%;
  background:linear-gradient(135deg,var(--sky-light),var(--blue));
  display:inline-block;
}
nav.main-nav ul{
  list-style:none;display:flex;gap:30px;margin:0;padding:0;
}
nav.main-nav a{
  text-decoration:none;color:var(--navy);font-weight:600;font-size:.98rem;
  position:relative;padding:4px 0;
}
nav.main-nav a::after{
  content:"";position:absolute;left:0;bottom:-3px;width:0;height:2px;
  background:var(--blue);transition:width .25s ease;
}
nav.main-nav a:hover::after{width:100%;}
.header-cta{
  background:var(--gold);
  color:var(--navy);
  font-weight:700;
  padding:12px 26px;
  border-radius:999px;
  text-decoration:none;
  box-shadow:0 10px 22px -8px rgba(255,199,44,.65);
  transition:transform .2s ease, box-shadow .2s ease;
  white-space:nowrap;
}
.header-cta:hover{transform:translateY(-2px);box-shadow:0 14px 28px -8px rgba(255,199,44,.8);}
.nav-toggle{display:none;}

/* ---------- Hero / Intro ---------- */
.hero{
  padding:64px 0 80px;
  background:
    radial-gradient(1100px 500px at 85% -10%, var(--sky-light) 0%, transparent 60%),
    linear-gradient(180deg,var(--white),var(--paper));
  overflow:hidden;
}
.hero-grid{
  display:grid;grid-template-columns:1fr 1.05fr;gap:56px;align-items:center;
}
.hero-media{position:relative;}
.hero-media img{
  border-radius:var(--radius-lg);
  box-shadow:var(--shadow);
  animation:floatY 5s ease-in-out infinite;
}
@keyframes floatY{
  0%,100%{transform:translateY(0);}
  50%{transform:translateY(-14px);}
}
.hero-media::after{
  content:"";position:absolute;inset:-40px -40px auto auto;
  width:220px;height:220px;border-radius:50%;
  background:radial-gradient(circle,var(--sky-light),transparent 70%);
  z-index:-1;
}
.hero h1{
  font-size:clamp(2.3rem,4.4vw,3.5rem);
  margin-bottom:6px;
}
.hero h2.subtitle{
  font-family:var(--sans);
  font-weight:600;
  font-size:1.25rem;
  color:var(--blue-deep);
  margin-bottom:22px;
}
.hero-badges{display:flex;flex-wrap:wrap;gap:10px;margin:22px 0 28px;}
.hero-badges span{
  background:var(--white);
  border:1px solid var(--line);
  padding:8px 14px;border-radius:999px;
  font-size:.88rem;font-weight:600;color:var(--navy-soft);
  display:flex;align-items:center;gap:6px;
}
.hero-badges span::before{content:"✓";color:var(--blue);font-weight:700;}
.cta-official{
  display:inline-flex;align-items:center;gap:10px;
  background:var(--gold);color:var(--navy);
  font-weight:700;font-size:1.05rem;
  padding:16px 34px;border-radius:999px;
  text-decoration:none;
  box-shadow:0 14px 30px -10px rgba(255,199,44,.7);
  transition:transform .2s ease, box-shadow .2s ease;
}
.cta-official:hover{transform:translateY(-3px) scale(1.02);box-shadow:0 20px 38px -10px rgba(255,199,44,.85);}
.cta-note{margin-top:12px;font-size:.85rem;color:var(--navy-soft);}

/* ---------- Cards / grids ---------- */
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:36px;align-items:center;}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:26px;}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;}
.card{
  background:var(--white);
  border:1px solid var(--line);
  border-radius:var(--radius-md);
  padding:28px;
  transition:transform .25s ease, box-shadow .25s ease, border-color .25s ease;
}
.card:hover{
  transform:translateY(-6px);
  box-shadow:var(--shadow);
  border-color:var(--sky-light);
}
.card .icon{
  width:52px;height:52px;border-radius:14px;
  background:linear-gradient(135deg,var(--sky-light),var(--blue));
  margin-bottom:16px;
  display:flex;align-items:center;justify-content:center;
  color:var(--white);font-size:1.4rem;font-weight:700;
}
.img-frame{
  border-radius:var(--radius-lg);
  overflow:hidden;
  box-shadow:var(--shadow);
  transition:transform .4s ease;
}
.img-frame:hover img{transform:scale(1.05);}
.img-frame img{transition:transform .5s ease;width:100%;}

/* ---------- Mechanism steps ---------- */
.mech-step{
  display:grid;grid-template-columns:.9fr 1.1fr;gap:44px;align-items:center;
  padding:44px 0;border-bottom:1px dashed var(--line);
}
.mech-step:last-child{border-bottom:none;}
.mech-step:nth-child(even){direction:rtl;}
.mech-step:nth-child(even) > *{direction:ltr;}
.mech-tag{
  display:inline-block;font-weight:700;color:var(--blue-deep);
  background:var(--sky-light);padding:5px 12px;border-radius:8px;
  font-size:.85rem;margin-bottom:12px;
}

/* ---------- Table (pricing / pros-cons) ---------- */
table.compare{width:100%;border-collapse:collapse;background:var(--white);border-radius:var(--radius-md);overflow:hidden;box-shadow:var(--shadow);}
table.compare th,table.compare td{padding:16px 18px;text-align:left;border-bottom:1px solid var(--line);}
table.compare th{background:var(--navy);color:var(--white);font-family:var(--serif);}
table.compare tr:last-child td{border-bottom:none;}
table.compare tr:hover td{background:var(--sky);}

.pros-cons{display:grid;grid-template-columns:1fr 1fr;gap:26px;}
.pros-cons .card ul{padding-left:20px;margin:0;}
.pros-cons .card.pros{border-top:4px solid var(--blue);}
.pros-cons .card.cons{border-top:4px solid var(--gold-deep);}

/* ---------- FAQ ---------- */
details.faq{
  background:var(--white);border:1px solid var(--line);border-radius:var(--radius-md);
  margin-bottom:14px;padding:6px 22px;transition:border-color .2s ease;
}
details.faq[open]{border-color:var(--blue);}
details.faq summary{
  cursor:pointer;font-family:var(--serif);font-weight:700;font-size:1.08rem;
  padding:16px 0;list-style:none;display:flex;justify-content:space-between;align-items:center;
}
details.faq summary::-webkit-details-marker{display:none;}
details.faq summary::after{content:"+";font-size:1.4rem;color:var(--blue);transition:transform .2s ease;}
details.faq[open] summary::after{content:"–";}
details.faq p{padding-bottom:16px;color:var(--navy-soft);}

/* ---------- Pricing image link ---------- */
.pricing-link{display:block;border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow);transition:transform .3s ease;}
.pricing-link:hover{transform:translateY(-6px);}

/* ---------- Reviewer strip ---------- */
.reviewer-strip{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;}
.reviewer-strip figure{margin:0;}
.reviewer-strip figcaption{font-size:.85rem;color:var(--navy-soft);margin-top:8px;text-align:center;}

/* ---------- Guarantee banner ---------- */
.banner{
  background:linear-gradient(120deg,var(--navy),var(--blue-deep));
  color:var(--white);border-radius:var(--radius-lg);
  padding:48px;display:flex;align-items:center;gap:36px;
}
.banner h2,.banner h3{color:var(--white);}
.banner .seal{
  width:110px;height:110px;border-radius:50%;
  background:var(--gold);color:var(--navy);
  display:flex;align-items:center;justify-content:center;
  font-family:var(--serif);font-weight:700;font-size:.95rem;text-align:center;
  flex:none;
}

/* ---------- Footer ---------- */
footer{background:var(--navy);color:#c9d8ea;padding:56px 0 26px;}
footer a{color:#c9d8ea;text-decoration:none;}
footer a:hover{color:var(--gold);}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:36px;margin-bottom:36px;}
.footer-grid h4{color:var(--white);font-family:var(--sans);font-size:.95rem;letter-spacing:.06em;text-transform:uppercase;}
.footer-grid ul{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:10px;}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);padding-top:22px;font-size:.85rem;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;color:#93a7c2;}

/* ---------- Back to top ---------- */
#backToTop{
  position:fixed;right:26px;bottom:26px;
  width:50px;height:50px;border-radius:50%;
  background:var(--blue);color:var(--white);border:none;
  font-size:1.3rem;cursor:pointer;box-shadow:var(--shadow);
  display:flex;align-items:center;justify-content:center;
  opacity:0;pointer-events:none;transform:translateY(10px);
  transition:opacity .25s ease, transform .25s ease, background .2s ease;
  z-index:60;
}
#backToTop.show{opacity:1;pointer-events:auto;transform:translateY(0);}
#backToTop:hover{background:var(--blue-deep);}

/* ---------- Article / research pages ---------- */
article.journal{max-width:840px;margin:0 auto;}
article.journal .byline{color:var(--navy-soft);font-size:.9rem;margin-bottom:36px;}
article.journal h2{margin-top:2em;}
article.journal blockquote{
  border-left:4px solid var(--blue);margin:0 0 1.4em;padding:6px 22px;
  color:var(--navy-soft);font-style:italic;background:var(--sky);border-radius:0 10px 10px 0;
}
.refs{font-size:.92rem;color:var(--navy-soft);}
.refs li{margin-bottom:10px;}

/* ---------- Responsive ---------- */
@media (max-width:980px){
  .hero-grid,.grid-2{grid-template-columns:1fr;}
  .grid-3{grid-template-columns:1fr 1fr;}
  .grid-4{grid-template-columns:1fr 1fr;}
  .mech-step{grid-template-columns:1fr;direction:ltr !important;}
  .pros-cons{grid-template-columns:1fr;}
  .footer-grid{grid-template-columns:1fr 1fr;}
  .reviewer-strip{grid-template-columns:1fr 1fr;}
}
@media (max-width:640px){
  body{font-size:16.5px;}
  .section{padding:52px 0;}
  nav.main-nav{
    position:fixed;inset:0 0 0 30%;background:var(--white);
    transform:translateX(100%);transition:transform .3s ease;
    padding:100px 28px 28px;z-index:55;box-shadow:-10px 0 30px rgba(0,0,0,.15);
  }
  nav.main-nav.open{transform:translateX(0);}
  nav.main-nav ul{flex-direction:column;gap:22px;}
  .nav-toggle{
    display:flex;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;z-index:56;
  }
  .nav-toggle span{width:26px;height:2px;background:var(--navy);}
  .grid-3,.grid-4{grid-template-columns:1fr;}
  .banner{flex-direction:column;text-align:center;padding:32px;}
  .footer-grid{grid-template-columns:1fr;}
  .reviewer-strip{grid-template-columns:1fr 1fr;}
}

@media (prefers-reduced-motion: reduce){
  *{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important;}
}