/* =========================================================
   Smart Water Box - Stylesheet
   Brand palette derived from #3281B5
========================================================= */
:root{
  --primary:#3281B5;
  --primary-dark:#1F5A82;
  --primary-darker:#123A54;
  --navy:#122A3A;
  --aqua-50:#F2F9FC;
  --aqua-100:#E3F2FA;
  --aqua-200:#CDE9F5;
  --accent:#F2A63A;
  --accent-dark:#D98A1A;
  --text:#152530;
  --text-soft:#4A5C68;
  --white:#FFFFFF;
  --border:#DCEAF2;
  --success:#2E9E6D;
  --radius:14px;
  --radius-sm:8px;
  --shadow:0 8px 24px rgba(18,58,84,.10);
  --shadow-lg:0 16px 40px rgba(18,58,84,.16);
  --max:1180px;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  color:var(--text);
  background:var(--white);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;height:auto;}
a{color:inherit;text-decoration:none;}
ul{padding:0;margin:0;list-style:none;}
h1,h2,h3,h4{font-family:Georgia,"Times New Roman",serif;line-height:1.2;margin:0 0 .5em;color:var(--navy);}
p{margin:0 0 1em;}
.container{max-width:var(--max);margin:0 auto;padding:0 20px;}
.section{padding:64px 0;}
.section-alt{background:var(--aqua-50);}
.eyebrow{
  display:inline-block;
  font-size:.78rem;
  font-weight:700;
  letter-spacing:.08em;
  text-transform:uppercase;
  color:var(--primary-dark);
  background:var(--aqua-100);
  padding:6px 14px;
  border-radius:999px;
  margin-bottom:14px;
}
.center{text-align:center;}
.section-head{max-width:680px;margin:0 auto 40px;text-align:center;}
.section-head h2{font-size:clamp(1.6rem,3vw,2.2rem);}
.section-head p{color:var(--text-soft);}

/* Buttons */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:16px 32px;
  border-radius:999px;
  font-weight:700;
  font-size:1.05rem;
  cursor:pointer;
  border:none;
  transition:transform .15s ease,box-shadow .15s ease;
}
.btn-primary{
  background:linear-gradient(135deg,var(--accent),var(--accent-dark));
  color:var(--navy);
  box-shadow:0 10px 26px rgba(217,138,26,.35);
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 32px rgba(217,138,26,.45);}
.btn-secondary{
  background:var(--white);
  color:var(--primary-dark);
  border:2px solid var(--primary);
}
.btn-block{width:100%;}
.btn-sub{display:block;text-align:center;font-size:.78rem;color:var(--text-soft);margin-top:10px;}

/* Announce bar */
.announce{
  background:var(--navy);
  color:var(--white);
  text-align:center;
  font-size:.85rem;
  padding:9px 14px;
  font-weight:600;
  letter-spacing:.01em;
}
.announce strong{color:#FFD27A;}

/* Sticky nav */
.nav{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.96);
  backdrop-filter:blur(6px);
  border-bottom:1px solid var(--border);
}
.nav-inner{
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 20px;max-width:var(--max);margin:0 auto;
}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.15rem;color:var(--navy);}
.logo-mark{
  width:34px;height:34px;border-radius:9px;
  background:linear-gradient(135deg,var(--primary),var(--primary-darker));
  display:flex;align-items:center;justify-content:center;color:#fff;font-size:1.1rem;
}
.nav-links{display:flex;gap:28px;font-weight:600;font-size:.92rem;color:var(--text-soft);}
.nav-links a:hover{color:var(--primary-dark);}
.nav-cta{display:none;}
@media(min-width:760px){.nav-cta{display:inline-flex;padding:11px 22px;font-size:.92rem;}}
.nav-links{display:none;}
@media(min-width:900px){.nav-links{display:flex;}}

/* Hero */
.hero{
  background:radial-gradient(circle at 20% 20%,var(--aqua-100),var(--aqua-50) 60%);
  padding:56px 0 40px;
}
.hero-grid{
  display:grid;gap:40px;align-items:center;
}
@media(min-width:900px){.hero-grid{grid-template-columns:1.05fr .95fr;}}
.hero h1{font-size:clamp(1.9rem,4.2vw,2.9rem);}
.hero-sub{font-size:1.1rem;color:var(--text-soft);margin-bottom:22px;}
.hero-badges{display:flex;flex-wrap:wrap;gap:10px 18px;margin:20px 0;font-size:.85rem;color:var(--text-soft);}
.hero-badges span{display:flex;align-items:center;gap:6px;font-weight:600;}
.check-dot{
  width:18px;height:18px;border-radius:50%;background:var(--success);
  color:#fff;display:inline-flex;align-items:center;justify-content:center;font-size:.65rem;flex-shrink:0;
}
.hero-price-line{display:flex;align-items:baseline;gap:12px;margin:22px 0 10px;}
.price-old{text-decoration:line-through;color:#9AAAB2;font-size:1.2rem;}
.price-new{font-size:2.1rem;font-weight:800;color:var(--primary-dark);}
.hero-cta-row{display:flex;flex-wrap:wrap;gap:14px;margin-top:8px;}
.hero-visual{
  background:var(--white);
  border-radius:var(--radius);
  box-shadow:var(--shadow-lg);
  padding:26px;
  text-align:center;
  border:1px solid var(--border);
}
.hero-visual .stat-row{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:18px;}
.stat-box{background:var(--aqua-50);border-radius:var(--radius-sm);padding:12px 6px;}
.stat-box b{display:block;font-size:1.15rem;color:var(--primary-dark);}
.stat-box span{font-size:.72rem;color:var(--text-soft);}
.stars{color:#F2A63A;font-size:1rem;letter-spacing:2px;}

/* Product illustration (SVG-based, no stock photos) */
.device-illustration{width:100%;max-width:280px;margin:0 auto;}

/* Why choose / cards */
.grid-4{display:grid;gap:24px;grid-template-columns:1fr;}
@media(min-width:700px){.grid-4{grid-template-columns:repeat(2,1fr);}}
@media(min-width:1000px){.grid-4{grid-template-columns:repeat(4,1fr);}}
.card{
  background:var(--white);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:26px 22px;
  box-shadow:var(--shadow);
}
.card-icon{
  width:46px;height:46px;border-radius:12px;
  background:var(--aqua-100);color:var(--primary-dark);
  display:flex;align-items:center;justify-content:center;
  font-size:1.3rem;margin-bottom:14px;
}
.card h3{font-size:1.05rem;margin-bottom:8px;}
.card p{color:var(--text-soft);font-size:.92rem;margin:0;}

/* Quick answer callout */
.callout{
  background:var(--aqua-100);
  border-left:4px solid var(--primary);
  border-radius:var(--radius-sm);
  padding:18px 22px;
  margin:24px 0;
  font-size:.98rem;
}
.callout b{color:var(--primary-darker);}

/* Two column with image */
.split{display:grid;gap:40px;align-items:center;}
@media(min-width:900px){.split{grid-template-columns:1fr 1fr;}}
.split.reverse .split-visual{order:2;}
@media(max-width:899px){.split .split-visual{order:-1;}}

/* Steps */
.steps{counter-reset:step;display:grid;gap:22px;grid-template-columns:1fr;}
@media(min-width:760px){.steps{grid-template-columns:repeat(2,1fr);}}
.step{
  display:flex;gap:16px;background:var(--white);
  border:1px solid var(--border);border-radius:var(--radius);padding:22px;
}
.step-num{
  flex-shrink:0;width:40px;height:40px;border-radius:50%;
  background:var(--primary);color:#fff;font-weight:800;
  display:flex;align-items:center;justify-content:center;
}
.step h3{font-size:1rem;margin-bottom:6px;}
.step p{font-size:.9rem;color:var(--text-soft);margin:0;}

/* CTA band */
.cta-band{
  background:linear-gradient(135deg,var(--primary-dark),var(--primary-darker));
  color:#fff;text-align:center;padding:44px 20px;border-radius:var(--radius);
}
.cta-band h2{color:#fff;font-size:1.6rem;}
.cta-band p{color:#D9EAF4;}

/* Benefits numbered grid */
.benefits-grid{display:grid;gap:20px;grid-template-columns:1fr;}
@media(min-width:700px){.benefits-grid{grid-template-columns:repeat(2,1fr);}}
.benefit{display:flex;gap:14px;}
.benefit-num{
  flex-shrink:0;width:34px;height:34px;border-radius:8px;
  background:var(--aqua-100);color:var(--primary-dark);font-weight:800;
  display:flex;align-items:center;justify-content:center;font-size:.9rem;
}
.benefit h4{margin:0 0 4px;font-size:1rem;}
.benefit p{margin:0;font-size:.9rem;color:var(--text-soft);}

/* Bonus cards */
.bonus-grid{display:grid;gap:24px;grid-template-columns:1fr;}
@media(min-width:760px){.bonus-grid{grid-template-columns:repeat(3,1fr);}}
.bonus-card{
  background:var(--white);border:2px solid var(--aqua-200);border-radius:var(--radius);
  padding:24px;text-align:center;position:relative;box-shadow:var(--shadow);
}
.bonus-tag{
  position:absolute;top:-12px;left:50%;transform:translateX(-50%);
  background:var(--accent);color:var(--navy);font-weight:800;font-size:.72rem;
  padding:5px 14px;border-radius:999px;
}
.bonus-icon{
  width:54px;height:54px;border-radius:50%;background:var(--aqua-100);
  display:flex;align-items:center;justify-content:center;font-size:1.5rem;
  margin:14px auto 14px;color:var(--primary-dark);
}
.bonus-value{color:var(--success);font-weight:700;font-size:.9rem;margin-top:10px;}

/* Ingredients / science limitation */
.limitation-box{
  background:#FFF7E8;border:1px solid #F2D9A8;border-radius:var(--radius-sm);
  padding:18px 20px;font-size:.9rem;color:#7A5A17;margin-top:20px;
}

/* Guarantee */
.guarantee{
  display:grid;gap:30px;align-items:center;
  background:var(--aqua-50);border-radius:var(--radius);padding:40px;
}
@media(min-width:800px){.guarantee{grid-template-columns:200px 1fr;}}
.guarantee-badge{
  width:170px;height:170px;border-radius:50%;
  background:linear-gradient(135deg,var(--primary),var(--primary-darker));
  color:#fff;display:flex;flex-direction:column;align-items:center;justify-content:center;
  margin:0 auto;text-align:center;box-shadow:var(--shadow-lg);
}
.guarantee-badge b{font-size:2rem;}
.guarantee-badge span{font-size:.75rem;text-transform:uppercase;letter-spacing:.05em;}

/* How to use steps (numbered list) */
.use-steps{display:grid;gap:18px;}
.use-step{display:flex;gap:14px;align-items:flex-start;}

/* Pros cons */
.proscons{display:grid;gap:24px;grid-template-columns:1fr;}
@media(min-width:760px){.proscons{grid-template-columns:1fr 1fr;}}
.pc-card{border-radius:var(--radius);padding:26px;}
.pc-card.pros{background:#EFFAF4;border:1px solid #CDEEDD;}
.pc-card.cons{background:#FDF3E9;border:1px solid #F3DCBB;}
.pc-card h3{font-size:1.05rem;}
.pc-list{display:flex;flex-direction:column;gap:10px;font-size:.92rem;}
.pc-list li{display:flex;gap:8px;}

/* Testimonials */
.test-grid{display:grid;gap:22px;grid-template-columns:1fr;}
@media(min-width:700px){.test-grid{grid-template-columns:repeat(2,1fr);}}
@media(min-width:1000px){.test-grid{grid-template-columns:repeat(3,1fr);}}
.test-card{
  background:var(--white);border:1px solid var(--border);border-radius:var(--radius);
  padding:22px;box-shadow:var(--shadow);
}
.test-top{display:flex;align-items:center;gap:12px;margin-bottom:12px;}
.avatar{
  width:42px;height:42px;border-radius:50%;
  background:var(--primary);color:#fff;font-weight:800;
  display:flex;align-items:center;justify-content:center;flex-shrink:0;
}
.test-name{font-weight:700;font-size:.92rem;}
.test-loc{font-size:.78rem;color:var(--text-soft);}
.test-card p{font-size:.9rem;color:var(--text-soft);margin:0;}

/* FAQ accordion */
.faq-item{border-bottom:1px solid var(--border);}
.faq-q{
  width:100%;text-align:left;background:none;border:none;
  padding:18px 4px;font-weight:700;font-size:1rem;cursor:pointer;
  display:flex;justify-content:space-between;align-items:center;color:var(--navy);
  font-family:inherit;
}
.faq-icon{transition:transform .2s;color:var(--primary);font-size:1.2rem;flex-shrink:0;margin-left:12px;}
.faq-item.open .faq-icon{transform:rotate(45deg);}
.faq-a{max-height:0;overflow:hidden;transition:max-height .25s ease;font-size:.92rem;color:var(--text-soft);}
.faq-item.open .faq-a{max-height:400px;padding-bottom:18px;}

/* Order flow */
.order-flow{display:grid;gap:20px;grid-template-columns:1fr;}
@media(min-width:760px){.order-flow{grid-template-columns:repeat(4,1fr);}}
.order-step{text-align:center;padding:20px 14px;}
.order-step .step-num{margin:0 auto 12px;}

/* Trust badges row */
.trust-row{display:flex;flex-wrap:wrap;justify-content:center;gap:26px;margin-top:26px;font-size:.82rem;color:var(--text-soft);}
.trust-row span{display:flex;align-items:center;gap:6px;font-weight:600;}

/* Breadcrumbs */
.breadcrumb{font-size:.82rem;color:var(--text-soft);padding:14px 20px;max-width:var(--max);margin:0 auto;}
.breadcrumb a{color:var(--primary-dark);font-weight:600;}
.breadcrumb a:hover{text-decoration:underline;}
.breadcrumb .sep{margin:0 6px;color:#B7C6CE;}
.breadcrumb .current{color:var(--text);}

/* Sources / references block */
.sources-box{background:var(--aqua-50);border:1px solid var(--border);border-radius:var(--radius-sm);padding:20px 22px;margin-top:22px;font-size:.88rem;}
.sources-box h4{margin:0 0 10px;font-size:.92rem;color:var(--navy);}
.sources-box ol{padding-left:20px;margin:0;}
.sources-box li{margin-bottom:6px;color:var(--text-soft);}
.sources-box a{color:var(--primary-dark);font-weight:600;text-decoration:underline;}

/* Blog */
.blog-grid{display:grid;gap:26px;grid-template-columns:1fr;}
@media(min-width:700px){.blog-grid{grid-template-columns:repeat(2,1fr);}}
@media(min-width:1000px){.blog-grid{grid-template-columns:repeat(3,1fr);}}
.blog-card{background:var(--white);border:1px solid var(--border);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow);}
.blog-card .eyebrow{margin-bottom:10px;}
.blog-card h3{font-size:1.1rem;margin-bottom:10px;}
.blog-card h3 a{color:var(--navy);}
.blog-card h3 a:hover{color:var(--primary-dark);}
.blog-card p{font-size:.9rem;color:var(--text-soft);}
.read-more{font-weight:700;font-size:.88rem;color:var(--primary-dark);}
.article-body{max-width:760px;margin:0 auto;padding:20px;}
.article-body h2{margin-top:36px;font-size:1.4rem;}
.article-body h3{margin-top:24px;font-size:1.15rem;}
.article-body p,.article-body li{color:var(--text-soft);font-size:1rem;}
.article-body ul,.article-body ol{padding-left:22px;margin-bottom:1em;}
.article-meta{font-size:.82rem;color:var(--text-soft);margin-bottom:22px;}
.article-cta{background:var(--aqua-100);border-radius:var(--radius);padding:24px;text-align:center;margin:34px 0;}
.related-posts{display:grid;gap:16px;grid-template-columns:1fr;margin-top:16px;}
@media(min-width:700px){.related-posts{grid-template-columns:repeat(3,1fr);}}
.related-posts a{display:block;background:var(--aqua-50);border-radius:var(--radius-sm);padding:14px 16px;font-size:.88rem;font-weight:600;color:var(--primary-dark);border:1px solid var(--border);}

/* Footer */
footer{background:var(--navy);color:#B9CBD6;padding:50px 0 24px;font-size:.88rem;}
.footer-grid{display:grid;gap:30px;grid-template-columns:1fr;margin-bottom:30px;}
@media(min-width:760px){.footer-grid{grid-template-columns:1.4fr 1fr 1fr 1fr;}}
.footer-grid h4{color:#fff;font-size:.9rem;margin-bottom:14px;}
.footer-grid ul{display:flex;flex-direction:column;gap:9px;}
.footer-grid a:hover{color:#fff;}
.footer-legal{border-top:1px solid rgba(255,255,255,.1);padding-top:20px;font-size:.78rem;color:#7F94A0;line-height:1.7;}
.footer-bottom{margin-top:18px;font-size:.78rem;color:#7F94A0;text-align:center;}

/* Utility */
.mt-0{margin-top:0;}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);}
@media (prefers-reduced-motion: reduce){
  *{animation:none !important;transition:none !important;}
}