/* Kerassentials Health — independent product research site. Mobile-first. */
:root{
  --ink:#1c2757; --ink-2:#41508b; --teal:#2ea28b; --teal-dark:#177a67; --teal-ink:#0e5b4d;
  --mint:#eaf6f2; --cream:#fbf7ee; --paper:#ffffff; --line:#e3e8f0; --text:#2b3247; --muted:#5c6579;
  --amber:#b97f24; --red:#b3402f; --radius:14px; --shadow:0 10px 30px rgba(28,39,87,.08);
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{margin:0;font-family:var(--font);color:var(--text);background:var(--paper);font-size:1.0625rem;line-height:1.72}
img{max-width:100%;height:auto;display:block}
a{color:var(--teal-dark)}
a:hover{color:var(--teal-ink)}
:focus-visible{outline:3px solid var(--teal);outline-offset:2px;border-radius:4px}
.wrap{max-width:1120px;margin:0 auto;padding:0 18px}
.skip{position:absolute;left:-999px;top:0;background:var(--ink);color:#fff;padding:10px 16px;z-index:200}
.skip:focus{left:8px;top:8px}
/* Top disclosure bar */
.topbar{background:var(--ink);color:#dfe5f7;font-size:.8rem;padding:7px 0}
.topbar .wrap{display:flex;justify-content:center;text-align:center}
.topbar a{color:#fff}
/* Header */
header.site{position:sticky;top:0;background:rgba(255,255,255,.96);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);z-index:100}
.nav{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 0}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink)}
.brand img{width:38px;height:38px;border-radius:50%}
.brand b{font-size:1.08rem;letter-spacing:-.01em;line-height:1.15;display:block}
.brand small{display:block;color:var(--muted);font-size:.68rem;font-weight:600;letter-spacing:.06em;text-transform:uppercase}
.navlinks{display:none;list-style:none;margin:0;padding:0;gap:4px;align-items:center}
.navlinks a{display:block;padding:9px 12px;border-radius:9px;text-decoration:none;color:var(--ink);font-weight:600;font-size:.92rem}
.navlinks a:hover{background:var(--mint);color:var(--teal-ink)}
.nav-cta{background:var(--teal);color:#fff !important;border-radius:10px !important}
.nav-cta:hover{background:var(--teal-dark)}
.burger{display:inline-flex;flex-direction:column;justify-content:center;gap:5px;width:46px;height:44px;padding:10px;background:#fff;border:1px solid var(--line);border-radius:10px;cursor:pointer}
.burger span{display:block;height:2.5px;background:var(--ink);border-radius:2px;transition:transform .25s,opacity .25s}
.burger[aria-expanded="true"] span:nth-child(1){transform:translateY(7.5px) rotate(45deg)}
.burger[aria-expanded="true"] span:nth-child(2){opacity:0}
.burger[aria-expanded="true"] span:nth-child(3){transform:translateY(-7.5px) rotate(-45deg)}
.mnav{display:none;border-top:1px solid var(--line);background:#fff;padding:10px 18px 18px}
.mnav.open{display:block}
.mnav a{display:block;padding:12px 6px;border-bottom:1px solid var(--line);text-decoration:none;color:var(--ink);font-weight:600}
.mnav a:last-child{border-bottom:0}
.mnav .mnav-cta{margin-top:10px;background:var(--teal);color:#fff;border-radius:10px;text-align:center;border-bottom:0}
@media(min-width:940px){
  .navlinks{display:flex}
  .burger,.mnav{display:none !important}
}
/* Breadcrumbs */
.crumbs{font-size:.82rem;color:var(--muted);padding:14px 0 0}
.crumbs ol{list-style:none;display:flex;flex-wrap:wrap;gap:6px;margin:0;padding:0}
.crumbs a{color:var(--muted);text-decoration:none}
.crumbs a:hover{color:var(--teal-dark)}
.crumbs li+li::before{content:"›";margin-right:6px;color:#b6bdcd}
/* Hero */
.hero{background:linear-gradient(180deg,var(--mint) 0%,#fff 90%);padding:34px 0 8px}
.hero-grid{display:grid;gap:26px}
@media(min-width:900px){.hero-grid{grid-template-columns:1.15fr .85fr;align-items:center}.hero{padding:52px 0 20px}}
h1{color:var(--ink);font-size:clamp(1.65rem,4.6vw,2.7rem);line-height:1.16;letter-spacing:-.02em;margin:.2em 0 .5em}
h2{color:var(--ink);font-size:clamp(1.28rem,3vw,1.7rem);line-height:1.25;letter-spacing:-.015em;margin:1.6em 0 .6em}
h3{color:var(--ink);font-size:clamp(1.05rem,2.4vw,1.25rem);margin:1.4em 0 .5em}
.kicker{display:inline-block;background:#fff;border:1px solid var(--line);color:var(--teal-dark);font-weight:700;font-size:.72rem;letter-spacing:.09em;text-transform:uppercase;border-radius:999px;padding:6px 14px;box-shadow:var(--shadow)}
.lede{font-size:clamp(1.02rem,2.2vw,1.17rem);color:var(--muted)}
.hero-img{margin:0}
.hero-img img{margin:0 auto;max-height:440px;width:auto}
figcaption,.caption{font-size:.8rem;color:var(--muted);margin-top:8px}
/* Buttons */
.btn{display:inline-block;background:linear-gradient(180deg,#37b39a,var(--teal-dark));color:#fff;font-weight:700;text-decoration:none;border-radius:12px;padding:14px 26px;font-size:1rem;box-shadow:0 8px 20px rgba(23,122,103,.28);border:0;cursor:pointer}
.btn:hover{filter:brightness(1.06);color:#fff}
.btn-sm{padding:10px 18px;font-size:.9rem}
.btn-ghost{background:#fff;color:var(--ink);border:1.5px solid var(--line);box-shadow:none}
.btn-ghost:hover{color:var(--teal-dark);border-color:var(--teal)}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin:20px 0}
.cta-note{font-size:.8rem;color:var(--muted)}
/* Quick answer */
.qa{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px 20px 8px;margin:26px 0}
.qa h2{margin-top:.2em}
.qa dl{display:grid;grid-template-columns:1fr;gap:0;margin:0}
@media(min-width:640px){.qa dl{grid-template-columns:1fr 1fr;column-gap:28px}}
.qa dt{font-weight:700;color:var(--ink);font-size:.86rem;text-transform:uppercase;letter-spacing:.05em;margin-top:14px}
.qa dd{margin:2px 0 10px;font-size:.98rem}
/* TOC */
.toc{background:var(--cream);border:1px solid #eee4cf;border-radius:var(--radius);padding:18px 22px;margin:26px 0}
.toc p{margin:0 0 8px;font-weight:800;color:var(--ink);font-size:.9rem;letter-spacing:.06em;text-transform:uppercase}
.toc ol{margin:0;padding-left:20px;columns:1}
@media(min-width:820px){.toc ol{columns:2;column-gap:34px}}
.toc li{margin:5px 0;break-inside:avoid}
.toc a{text-decoration:none;font-size:.95rem}
/* Cards & sections */
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px}
.grid2{display:grid;gap:18px}
@media(min-width:820px){.grid2{grid-template-columns:1fr 1fr}}
.grid3{display:grid;gap:18px}
@media(min-width:700px){.grid3{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1000px){.grid3{grid-template-columns:repeat(3,1fr)}}
/* Callouts: fact / claim / evidence */
.callout{border-radius:12px;padding:16px 18px;margin:18px 0;border:1px solid var(--line);border-left-width:5px;background:#fff}
.callout .co-label{display:block;font-size:.72rem;font-weight:800;letter-spacing:.08em;text-transform:uppercase;margin-bottom:6px}
.co-fact{border-left-color:var(--ink);background:#f6f8ff}.co-fact .co-label{color:var(--ink)}
.co-claim{border-left-color:var(--amber);background:#fdf8ee}.co-claim .co-label{color:var(--amber)}
.co-evidence{border-left-color:var(--teal);background:var(--mint)}.co-evidence .co-label{color:var(--teal-ink)}
.co-note{border-left-color:var(--red);background:#fdf4f2}.co-note .co-label{color:var(--red)}
/* Tables */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:12px;margin:20px 0;background:#fff;-webkit-overflow-scrolling:touch}
table{border-collapse:collapse;width:100%;font-size:.95rem;min-width:540px}
caption{caption-side:top;text-align:left;padding:12px 14px 0;color:var(--muted);font-size:.85rem}
th{background:var(--ink);color:#fff;text-align:left;padding:11px 14px;font-size:.85rem;letter-spacing:.03em}
td{padding:11px 14px;border-top:1px solid var(--line);vertical-align:top}
tbody tr:nth-child(even){background:#f8fafc}
table.narrow{min-width:0}
/* Pros / cons */
.proscons{display:grid;gap:16px}
@media(min-width:760px){.proscons{grid-template-columns:1fr 1fr}}
.pros,.cons{border-radius:12px;padding:18px 20px}
.pros{background:var(--mint);border:1px solid #cfe9e0}
.cons{background:#fdf4f2;border:1px solid #f0d8d2}
.pros h3,.cons h3{margin-top:0}
.pros li::marker{content:"✓  ";color:var(--teal-dark);font-weight:700}
.cons li::marker{content:"–  ";color:var(--red)}
/* FAQ */
details.faq{border:1px solid var(--line);border-radius:12px;background:#fff;margin:12px 0;padding:0}
details.faq summary{cursor:pointer;padding:15px 18px;font-weight:700;color:var(--ink);list-style:none;display:flex;justify-content:space-between;gap:12px;align-items:center}
details.faq summary::-webkit-details-marker{display:none}
details.faq summary::after{content:"+";font-size:1.3rem;color:var(--teal);transition:transform .2s}
details.faq[open] summary::after{transform:rotate(45deg)}
details.faq .faq-body{padding:0 18px 16px}
/* Related */
.related{margin:44px 0 10px}
.related h2{margin-bottom:14px}
.rel-grid{display:grid;gap:14px}
@media(min-width:760px){.rel-grid{grid-template-columns:repeat(3,1fr)}}
.rel-card{display:block;background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px;text-decoration:none;color:var(--ink);font-weight:600;font-size:.94rem;transition:box-shadow .2s,transform .2s}
.rel-card:hover{box-shadow:var(--shadow);transform:translateY(-2px);color:var(--teal-ink)}
.rel-card small{display:block;color:var(--teal-dark);font-weight:700;font-size:.7rem;letter-spacing:.07em;text-transform:uppercase;margin-bottom:6px}
/* Article meta */
.meta{display:flex;flex-wrap:wrap;gap:8px 18px;color:var(--muted);font-size:.83rem;margin:6px 0 4px}
.meta b{color:var(--ink)}
/* References */
.refs{font-size:.85rem;color:var(--muted)}
.refs ol{padding-left:20px}
.refs li{margin:6px 0;overflow-wrap:anywhere}
/* Footer */
footer.site{background:var(--ink);color:#c8d0ea;margin-top:64px;padding:44px 0 30px;font-size:.9rem}
footer.site h4{color:#fff;font-size:.82rem;letter-spacing:.08em;text-transform:uppercase;margin:0 0 12px}
.f-grid{display:grid;gap:28px}
@media(min-width:820px){.f-grid{grid-template-columns:2fr 1fr 1fr 1fr}}
footer.site a{color:#c8d0ea;text-decoration:none;display:block;padding:3px 0}
footer.site a:hover{color:#fff}
.f-disc{border-top:1px solid rgba(255,255,255,.14);margin-top:30px;padding-top:20px;font-size:.8rem;color:#98a3c8}
/* Sticky mobile CTA */
.stickybar{position:fixed;left:0;right:0;bottom:0;background:#fff;border-top:1px solid var(--line);box-shadow:0 -8px 24px rgba(28,39,87,.12);padding:10px 14px calc(10px + env(safe-area-inset-bottom));display:flex;gap:12px;align-items:center;z-index:120;transform:translateY(110%);transition:transform .3s}
.stickybar.show{transform:translateY(0)}
.stickybar .sb-txt{flex:1;min-width:0}
.stickybar .sb-txt b{display:block;color:var(--ink);font-size:.92rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.stickybar .sb-txt small{color:var(--muted);font-size:.74rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;display:block}
@media(max-width:400px){.stickybar .sb-txt small{display:none}}
.stickybar .btn{padding:11px 18px;font-size:.9rem;white-space:nowrap}
.sb-close{background:none;border:0;color:var(--muted);font-size:1.2rem;padding:6px;cursor:pointer}
@media(min-width:940px){.stickybar{display:none}}
body.has-sticky{padding-bottom:76px}
/* Blog index */
.post-row{display:block;background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px 20px;text-decoration:none;color:var(--ink);margin:10px 0}
.post-row:hover{box-shadow:var(--shadow);color:var(--teal-ink)}
.post-row small{color:var(--teal-dark);font-weight:700;letter-spacing:.06em;text-transform:uppercase;font-size:.7rem}
.post-row p{margin:6px 0 0;color:var(--muted);font-size:.93rem}
.cluster-tag{display:inline-block;background:var(--mint);color:var(--teal-ink);border-radius:999px;padding:3px 12px;font-size:.72rem;font-weight:700;margin-right:6px}
/* Misc */
.center{text-align:center}
.hr{border:0;border-top:1px solid var(--line);margin:36px 0}
.updated{font-size:.8rem;color:var(--muted)}
.img-duo{display:grid;gap:16px;grid-template-columns:1fr}
@media(min-width:700px){.img-duo{grid-template-columns:1fr 1fr;align-items:end}}
main{min-height:60vh}
.section-alt{background:linear-gradient(180deg,#fff, var(--mint) 30%, #fff 95%);padding:8px 0}
.verdict{background:var(--ink);color:#e8ecfa;border-radius:var(--radius);padding:26px 24px}
.verdict h2{color:#fff}
.verdict a{color:#8fd8c6}
mark.hl{background:#fff3c9;padding:0 4px;border-radius:4px}

figure.card.bonus{padding:14px;margin:0}
figure.card.bonus img{border-radius:10px}
figure.card.bonus figcaption{padding:10px 6px 4px;font-size:.85rem}