/* ProvaDent editorial/health design system — clean, dependency-free CSS */

:root{
  --navy:#1E2260;
  --navy-dark:#141748;
  --sky:#2FB6E0;
  --sky-light:#E7F7FC;
  --ink:#1A1F2B;
  --ink-soft:#4A5268;
  --paper:#FBFCFE;
  --paper-alt:#F2F5FA;
  --line:#E1E6EF;
  --white:#FFFFFF;
  --amber:#9A6B14;
  --amber-bg:#FBF1DD;
  --green:#1C7A4D;
  --green-bg:#E5F5EC;
  --red:#B3261E;
  --red-bg:#FBEAE9;
  --gray:#5B6472;
  --gray-bg:#EEF1F5;
  --radius:14px;
  --radius-sm:8px;
  --shadow:0 6px 24px rgba(20,23,72,.08);
  --shadow-sm:0 2px 8px rgba(20,23,72,.06);
  --maxw:1180px;
  --font-body:"Source Sans 3","Segoe UI",system-ui,-apple-system,Roboto,Arial,sans-serif;
  --font-head:"Fraunces","Georgia",serif;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--font-body);
  color:var(--ink);
  background:var(--paper);
  line-height:1.65;
  font-size:17px;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:var(--navy)}
a:focus-visible,button:focus-visible,summary:focus-visible,input:focus-visible{
  outline:3px solid var(--sky);outline-offset:2px;
}
.container{max-width:var(--maxw);margin:0 auto;padding:0 20px}
.container-narrow{max-width:820px;margin:0 auto;padding:0 20px}
h1,h2,h3,h4{font-family:var(--font-head);color:var(--navy-dark);line-height:1.2;margin:0 0 .5em}
h1{font-size:clamp(2rem,4.5vw,2.9rem);font-weight:700}
h2{font-size:clamp(1.5rem,3vw,2.1rem);font-weight:700}
h3{font-size:1.3rem;font-weight:700}
h4{font-size:1.1rem;font-weight:700}
p{margin:0 0 1em}
ul,ol{margin:0 0 1em;padding-left:1.3em}
li{margin-bottom:.4em}
.lede{font-size:1.15rem;color:var(--ink-soft)}
.section{padding:56px 0}
.section-alt{background:var(--paper-alt)}
.section-navy{background:var(--navy);color:#fff}
.section-navy h2,.section-navy h3{color:#fff}
.section-navy .muted{color:#B9C0E8}
.eyebrow{
  display:inline-block;font-size:.78rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;
  color:var(--sky);margin-bottom:.6em;
}
.muted{color:var(--ink-soft)}
.small{font-size:.9rem}

/* Skip link */
.skip-link{position:absolute;left:-999px;top:0;background:var(--navy);color:#fff;padding:10px 16px;z-index:200;border-radius:0 0 8px 0}
.skip-link:focus{left:0}

/* Header / Nav */
.site-header{position:sticky;top:0;z-index:100;background:rgba(251,252,254,.96);backdrop-filter:blur(6px);border-bottom:1px solid var(--line)}
.nav-row{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px 20px;max-width:var(--maxw);margin:0 auto}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--font-head);font-weight:700;font-size:1.3rem;color:var(--navy-dark);text-decoration:none}
.brand img{height:34px;width:auto}
.nav-links{display:flex;gap:22px;list-style:none;margin:0;padding:0;align-items:center;flex-wrap:wrap}
.nav-links a{color:var(--ink);text-decoration:none;font-weight:600;font-size:.96rem}
.nav-links a:hover{color:var(--navy)}
.nav-cta{background:var(--navy);color:#fff!important;padding:10px 18px;border-radius:999px;font-weight:700}
.nav-cta:hover{background:var(--navy-dark)}
.nav-toggle{display:none;background:none;border:1px solid var(--line);border-radius:8px;padding:8px 10px;cursor:pointer}
.nav-toggle span{display:block;width:22px;height:2px;background:var(--navy-dark);margin:4px 0}
.official-strip{background:var(--navy-dark);color:#cfd4f5;font-size:.82rem;text-align:center;padding:6px 12px}
.official-strip a{color:#fff}

@media (max-width:880px){
  .nav-links{position:fixed;top:0;right:0;height:100vh;width:min(300px,80vw);background:#fff;flex-direction:column;align-items:flex-start;padding:80px 24px 24px;box-shadow:-8px 0 24px rgba(0,0,0,.15);transform:translateX(100%);transition:transform .25s ease}
  .nav-links.open{transform:translateX(0)}
  .nav-toggle{display:block}
  .nav-cta{margin-top:10px}
}

/* Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:14px 26px;border-radius:999px;font-weight:700;text-decoration:none;font-size:1rem;border:2px solid transparent;cursor:pointer;transition:transform .12s ease,box-shadow .12s ease}
.btn-primary{background:var(--navy);color:#fff}
.btn-primary:hover{background:var(--navy-dark);transform:translateY(-1px)}
.btn-outline{background:transparent;border-color:var(--navy);color:var(--navy)}
.btn-outline:hover{background:var(--sky-light)}
.btn-lg{padding:16px 32px;font-size:1.05rem}
.btn-block{width:100%}

/* Hero */
.hero{padding:64px 0 48px}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center}
.hero-badges{display:flex;flex-wrap:wrap;gap:10px;margin:18px 0}
.pill{display:inline-flex;align-items:center;gap:6px;background:var(--sky-light);color:var(--navy-dark);font-size:.82rem;font-weight:700;padding:6px 12px;border-radius:999px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-top:22px}
.hero-figure{background:linear-gradient(160deg,var(--sky-light),#fff);border-radius:24px;padding:28px;box-shadow:var(--shadow)}
@media (max-width:900px){.hero-grid{grid-template-columns:1fr}.hero-figure{order:-1}}

/* Cards */
.card-grid{display:grid;gap:22px;grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow-sm)}
.card h3{margin-bottom:.4em}
.card-img{border-radius:var(--radius-sm);overflow:hidden;margin-bottom:14px;background:var(--paper-alt)}

/* Evidence badges */
.evidence{display:inline-flex;align-items:center;gap:6px;font-size:.78rem;font-weight:700;padding:5px 11px;border-radius:999px;margin-bottom:10px}
.evidence-clinical{background:var(--green-bg);color:var(--green)}
.evidence-review{background:#E4F0FB;color:#1B5A96}
.evidence-preliminary{background:var(--amber-bg);color:var(--amber)}
.evidence-limited{background:var(--gray-bg);color:var(--gray)}
.evidence-lab{background:#F1E9FB;color:#6B3FA0}
.evidence-notproduct{background:var(--red-bg);color:var(--red)}

/* Answer-first AEO blocks */
.answer-box{background:var(--sky-light);border-left:4px solid var(--sky);border-radius:0 var(--radius-sm) var(--radius-sm) 0;padding:18px 22px;margin:0 0 28px;font-size:1.08rem}
.answer-box strong{color:var(--navy-dark)}

/* Research cards */
.research-card{border:1px solid var(--line);border-radius:var(--radius);padding:22px;background:#fff}
.research-card + .research-card{margin-top:16px}
.research-card dl{display:grid;grid-template-columns:140px 1fr;gap:6px 14px;margin:12px 0 0;font-size:.95rem}
.research-card dt{font-weight:700;color:var(--ink-soft)}
.research-card dd{margin:0}
.research-card a{word-break:break-word;overflow-wrap:anywhere}
@media (max-width:480px){
  .research-card dl{grid-template-columns:1fr}
  .research-card dt{margin-top:.6em}
  .research-card dt:first-child{margin-top:0}
}

/* Tables */
.table-wrap{overflow-x:auto;margin:0 0 1.4em}
table{border-collapse:collapse;width:100%;min-width:520px;background:#fff}
th,td{text-align:left;padding:12px 14px;border-bottom:1px solid var(--line);font-size:.95rem}
th{background:var(--paper-alt);font-family:var(--font-head);color:var(--navy-dark)}

/* FAQ (native details/summary) */
.faq-item{border:1px solid var(--line);border-radius:var(--radius-sm);margin-bottom:12px;background:#fff;overflow:hidden}
.faq-item summary{cursor:pointer;padding:16px 20px;font-weight:700;color:var(--navy-dark);list-style:none;display:flex;justify-content:space-between;align-items:center;gap:12px}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";font-size:1.4rem;color:var(--sky);flex:0 0 auto}
.faq-item[open] summary::after{content:"–"}
.faq-item .faq-body{padding:0 20px 18px;color:var(--ink-soft)}

/* Pros/cons */
.split-grid{display:grid;gap:20px;grid-template-columns:1fr 1fr}
@media (max-width:700px){.split-grid{grid-template-columns:1fr}}
.pros{border:1px solid var(--green);background:var(--green-bg)}
.cons{border:1px solid var(--amber);background:var(--amber-bg)}
.split-grid .card ul{padding-left:1.1em}

/* Callouts */
.callout{border-radius:var(--radius);padding:20px 22px;margin:0 0 24px}
.callout-info{background:var(--sky-light);border:1px solid #BFE7F5}
.callout-warn{background:var(--amber-bg);border:1px solid #EBD9AE}
.callout-note{background:var(--gray-bg);border:1px solid var(--line)}
.callout h4{margin-top:0}

/* Breadcrumbs */
.breadcrumbs{font-size:.85rem;color:var(--ink-soft);padding:14px 0}
.breadcrumbs a{color:var(--ink-soft);text-decoration:none}
.breadcrumbs a:hover{text-decoration:underline}

/* Related links */
.related-list{list-style:none;padding:0;display:grid;gap:12px;grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
.related-list a{display:block;background:#fff;border:1px solid var(--line);border-radius:var(--radius-sm);padding:14px 16px;text-decoration:none;font-weight:700;color:var(--navy)}
.related-list a:hover{border-color:var(--sky)}

/* Footer */
.site-footer{background:var(--navy-dark);color:#C9CEEF;padding:48px 0 24px;margin-top:40px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:28px}
.footer-grid h5{color:#fff;font-family:var(--font-head);margin-bottom:.7em}
.footer-grid ul{list-style:none;padding:0;margin:0}
.footer-grid a{color:#C9CEEF;text-decoration:none;font-size:.92rem;line-height:2}
.footer-grid a:hover{color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:32px;padding-top:20px;font-size:.82rem;color:#9AA1CE;display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between}
@media (max-width:800px){.footer-grid{grid-template-columns:1fr 1fr}}
@media (max-width:480px){.footer-grid{grid-template-columns:1fr;gap:24px}}

/* Compare / checklist */
.checklist{list-style:none;padding:0}
.checklist li{display:flex;gap:10px;align-items:flex-start;padding:10px 0;border-bottom:1px solid var(--line)}
.checklist li:last-child{border-bottom:none}
.checklist .mark{flex:0 0 auto;width:22px;height:22px;border-radius:50%;background:var(--green-bg);color:var(--green);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.85rem}

/* Utility */
.text-center{text-align:center}
.mt-0{margin-top:0}
.stack-lg > * + *{margin-top:28px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}