/* NeuroPrime XT Research - Complete site stylesheet
   Self-contained: no external CSS frameworks or fonts required. */

:root{
  --bg:#f7f9fc;
  --surface:#ffffff;
  --surface-2:#f0f4f9;
  --text:#182230;
  --muted:#5d6b7a;
  --line:#dfe6ee;
  --primary:#3657d6;
  --primary-dark:#2442b4;
  --accent:#6b45c7;
  --success:#176b4d;
  --warning:#8a5a00;
  --shadow:0 10px 30px rgba(25,45,75,.08);
  --radius:16px;
  --max:1180px;
}

*,
*::before,
*::after{box-sizing:border-box}

html{scroll-behavior:smooth}

body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;
  font-size:16px;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}

img{max-width:100%;height:auto;display:block}

a{
  color:var(--primary);
  text-decoration:none;
  transition:color .18s ease,background-color .18s ease,border-color .18s ease,transform .18s ease;
}
a:hover{color:var(--primary-dark);text-decoration:underline}
a:focus-visible,button:focus-visible{
  outline:3px solid rgba(54,87,214,.28);
  outline-offset:3px;
  border-radius:6px;
}

.container{
  width:min(var(--max),calc(100% - 40px));
  margin-inline:auto;
}

.site-header{
  position:sticky;
  top:0;
  z-index:1000;
  background:rgba(255,255,255,.96);
  border-bottom:1px solid var(--line);
  box-shadow:0 3px 16px rgba(20,35,60,.05);
  backdrop-filter:blur(12px);
}

.nav{
  min-height:78px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:22px;
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:11px;
  color:var(--text);
  font-weight:800;
  font-size:17px;
  line-height:1.2;
  flex:0 0 auto;
}
.brand:hover{color:var(--text);text-decoration:none}
.brand img{
  width:44px;
  height:44px;
  object-fit:contain;
  border-radius:10px;
}

.menu{
  display:flex;
  align-items:center;
  justify-content:flex-end;
  gap:5px;
  flex-wrap:wrap;
}
.menu a{
  color:#334154;
  font-size:14px;
  font-weight:650;
  padding:8px 9px;
  border-radius:9px;
  white-space:nowrap;
}
.menu a:hover{
  color:var(--primary);
  background:#eef2ff;
  text-decoration:none;
}
.menu a.cta,
.menu a.cta:hover{
  color:#fff;
  background:linear-gradient(135deg,var(--primary),var(--accent));
  box-shadow:0 7px 18px rgba(54,87,214,.2);
  padding-inline:14px;
}

.hero{
  background:
    radial-gradient(circle at 90% 10%,rgba(107,69,199,.10),transparent 35%),
    radial-gradient(circle at 10% 30%,rgba(54,87,214,.10),transparent 35%),
    #fff;
  border-bottom:1px solid var(--line);
  padding:72px 0 66px;
}

.hero-grid{
  display:grid;
  grid-template-columns:minmax(0,1.12fr) minmax(320px,.88fr);
  align-items:center;
  gap:56px;
}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  color:var(--primary-dark);
  font-size:12px;
  line-height:1.3;
  letter-spacing:.11em;
  text-transform:uppercase;
  font-weight:850;
  margin-bottom:13px;
}
.eyebrow::before{
  content:"";
  width:28px;
  height:2px;
  border-radius:99px;
  background:linear-gradient(90deg,var(--primary),var(--accent));
}

h1,h2,h3,h4{
  margin:0 0 14px;
  color:#111b29;
  line-height:1.2;
  letter-spacing:-.02em;
}
h1{font-size:clamp(36px,5vw,58px);max-width:900px}
h2{font-size:clamp(28px,3.5vw,40px)}
h3{font-size:20px}
h4{font-size:17px}

p{margin:0 0 16px}
.lead{
  color:#4d5b6b;
  font-size:19px;
  line-height:1.7;
  max-width:800px;
}
.intro{
  color:var(--muted);
  font-size:17px;
  max-width:850px;
}

.buttons{
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:12px;
  margin:24px 0;
}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:46px;
  padding:11px 18px;
  border:1px solid var(--primary);
  border-radius:10px;
  background:linear-gradient(135deg,var(--primary),var(--accent));
  color:#fff;
  font-weight:800;
  font-size:15px;
  box-shadow:0 8px 20px rgba(54,87,214,.18);
  cursor:pointer;
}
.btn:hover{
  color:#fff;
  text-decoration:none;
  transform:translateY(-1px);
}
.btn.secondary{
  background:#fff;
  color:var(--primary-dark);
  border-color:#cdd7e7;
  box-shadow:none;
}
.btn.secondary:hover{
  background:#f4f6ff;
  color:var(--primary-dark);
}

.disclosure{
  max-width:900px;
  padding:14px 16px;
  margin:20px 0 0;
  border:1px solid #e1e7ef;
  border-left:4px solid var(--accent);
  border-radius:10px;
  background:#fbfcfe;
  color:#596777;
  font-size:13px;
  line-height:1.6;
}

.meta{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:10px;
  margin-top:22px;
}
.meta>div{
  padding:13px 14px;
  border:1px solid var(--line);
  border-radius:12px;
  background:rgba(255,255,255,.86);
}
.meta b{
  display:block;
  color:#263446;
  font-size:12px;
  text-transform:uppercase;
  letter-spacing:.05em;
  margin-bottom:4px;
}
.meta span{
  display:block;
  color:var(--muted);
  font-size:13px;
  line-height:1.45;
}

.hero-img{
  width:min(100%,520px);
  max-height:500px;
  object-fit:contain;
  margin-inline:auto;
  filter:drop-shadow(0 24px 30px rgba(22,33,54,.16));
}

.section{padding:72px 0}
.section.alt{
  background:var(--surface-2);
  border-top:1px solid #e7edf4;
  border-bottom:1px solid #e7edf4;
}

.grid2{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:28px;
  align-items:start;
}
.grid3{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:20px;
}

.card{
  height:100%;
  padding:24px;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
}
.card p:last-child{margin-bottom:0}
.card h3{margin-top:8px}

.tag{
  display:inline-flex;
  align-items:center;
  padding:5px 9px;
  border-radius:999px;
  background:#eef2ff;
  color:var(--primary-dark);
  font-size:11px;
  font-weight:850;
  letter-spacing:.07em;
  text-transform:uppercase;
}
.small{font-size:13px;color:var(--muted)}

.notice,
.caution{
  margin-top:24px;
  padding:17px 19px;
  border-radius:12px;
  line-height:1.65;
}
.notice{
  border:1px solid #cddaf8;
  background:#f3f6ff;
  color:#344663;
}
.caution{
  border:1px solid #ead9b2;
  background:#fffaf0;
  color:#684f19;
}

.answer-table{
  width:100%;
  border-collapse:separate;
  border-spacing:0;
  margin-top:26px;
  overflow:hidden;
  border:1px solid var(--line);
  border-radius:14px;
  background:#fff;
  box-shadow:var(--shadow);
}
.answer-table th,
.answer-table td{
  padding:17px 18px;
  text-align:left;
  vertical-align:top;
  border-bottom:1px solid var(--line);
}
.answer-table th{
  width:32%;
  background:#f7f9fd;
  color:#223149;
  font-weight:800;
}
.answer-table td{color:#536173}
.answer-table tr:last-child th,
.answer-table tr:last-child td{border-bottom:0}

.article{
  max-width:900px;
  margin-inline:auto;
}
.article p,
.article li{color:#4e5c6c}
.article ul,
.article ol{padding-left:22px}
.article li{margin:7px 0}
.article blockquote{
  margin:24px 0;
  padding:18px 22px;
  border-left:4px solid var(--primary);
  background:#f4f7ff;
  color:#40516b;
  border-radius:0 12px 12px 0;
}
.article-hero{
  padding:54px 0 30px;
  background:#fff;
  border-bottom:1px solid var(--line);
}
.article-hero h1{font-size:clamp(34px,5vw,52px)}
.breadcrumb{
  color:#728094;
  font-size:13px;
  margin-bottom:18px;
}
.breadcrumb a{color:var(--primary)}

.product-shot{
  max-width:520px;
  margin:25px auto;
  border-radius:18px;
  background:#fff;
  border:1px solid var(--line);
  padding:18px;
  box-shadow:var(--shadow);
}
.source-list{
  padding-left:22px;
}
.source-list li{margin:9px 0}

.center{text-align:center}
.center .intro{margin-inline:auto}

.footer{
  background:#121b29;
  color:#aeb9c8;
  padding:58px 0 0;
}
.footer .brand{color:#fff}
.footer .brand:hover{color:#fff}
.footer h3{color:#fff;font-size:16px}
.footer p{color:#aeb9c8;font-size:14px}
.footer a{color:#cbd6e5}
.footer a:hover{color:#fff}
.footer-grid{
  display:grid;
  grid-template-columns:1.35fr .8fr .9fr;
  gap:40px;
  padding-bottom:38px;
}
.footer ul{
  list-style:none;
  margin:0;
  padding:0;
}
.footer li{margin:7px 0;font-size:14px}
.copyright{
  padding:18px 0 25px;
  border-top:1px solid rgba(255,255,255,.12);
  color:#8e9aac;
  font-size:12px;
}

hr{
  border:0;
  border-top:1px solid var(--line);
  margin:34px 0;
}

table{max-width:100%}
code{
  padding:2px 5px;
  border-radius:5px;
  background:#eef2f6;
  font-size:.9em;
}
::selection{background:#dce5ff;color:#17213b}

@media (max-width:1080px){
  .nav{align-items:flex-start;padding:14px 0}
  .menu{justify-content:flex-start}
  .meta{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (max-width:820px){
  .container{width:min(var(--max),calc(100% - 28px))}
  .site-header{position:relative}
  .nav{display:block}
  .brand{margin-bottom:12px}
  .menu{gap:3px}
  .menu a{font-size:13px;padding:7px 8px}
  .hero{padding:48px 0}
  .hero-grid,
  .grid2,
  .grid3,
  .footer-grid{grid-template-columns:1fr}
  .hero-grid{gap:34px}
  .hero-img{max-width:420px;max-height:420px}
  .section{padding:52px 0}
  .card{padding:20px}
}

@media (max-width:560px){
  body{font-size:15px}
  h1{font-size:34px}
  h2{font-size:28px}
  .lead{font-size:17px}
  .meta{grid-template-columns:1fr}
  .buttons{align-items:stretch}
  .buttons .btn{width:100%}
  .answer-table,
  .answer-table tbody,
  .answer-table tr,
  .answer-table th,
  .answer-table td{display:block;width:100%}
  .answer-table th{border-bottom:0;padding-bottom:6px}
  .answer-table td{padding-top:6px}
}

.menu a.active{color:var(--primary-dark);background:#eef2ff}


/* Guarantee + pricing blocks */
.guarantee-section{
  background:#fbf9ff;
  border-top:1px solid #ece7f6;
  border-bottom:1px solid #ece7f6;
}
.guarantee-box{
  max-width:1050px;
  margin:0 auto;
  display:grid;
  grid-template-columns:220px minmax(0,1fr);
  align-items:center;
  gap:42px;
  padding:34px 46px;
  background:#fff;
  border-radius:18px;
  border:1px solid #e5e8ef;
  box-shadow:0 12px 34px rgba(30,40,70,.07);
}
.guarantee-badge{
  width:190px;
  height:190px;
  object-fit:contain;
  margin:auto;
}
.guarantee-copy h2{
  font-size:clamp(32px,4vw,46px);
  margin-bottom:0;
  color:#111;
}
.guarantee-copy h3{
  font-size:clamp(29px,3.5vw,42px);
  line-height:1.04;
  margin-bottom:12px;
  color:#111;
}
.guarantee-copy h3 span{color:#f00000}
.guarantee-copy p{
  max-width:760px;
  color:#222d3a;
  font-size:17px;
  line-height:1.55;
  margin-bottom:18px;
}

.pricing-section{
  background:#fff;
}
.pricing-image-link{
  display:block;
  width:min(100%,1000px);
  margin:30px auto 0;
  border-radius:18px;
}
.pricing-image{
  width:100%;
  height:auto;
  border-radius:18px;
  box-shadow:0 16px 38px rgba(25,45,75,.14);
  border:1px solid #e1e7ef;
  transition:transform .2s ease,box-shadow .2s ease;
}
.pricing-image-link:hover .pricing-image{
  transform:translateY(-3px);
  box-shadow:0 20px 44px rgba(25,45,75,.18);
}
.pricing-cta{
  text-align:center;
  margin-top:24px;
}
.pricing-cta p{
  color:#526071;
  margin-bottom:12px;
}
.pricing-note{
  margin-top:16px;
}

@media (max-width:820px){
  .guarantee-box{
    grid-template-columns:1fr;
    text-align:center;
    gap:12px;
    padding:28px 22px;
  }
  .guarantee-badge{
    width:155px;
    height:155px;
  }
  .guarantee-copy p{margin-inline:auto}
  .guarantee-copy .btn{margin-inline:auto}
}

@media (max-width:560px){
  .guarantee-copy h2{font-size:31px}
  .guarantee-copy h3{font-size:29px}
  .guarantee-copy p{font-size:15px}
}