/* Polarity — global stylesheet */
:root{
  --ink:#161B26; --slate:#5B6472; --mute:#8C94A3; --line:#D9DCE1;
  --paper:#FFFFFF; --mist:#F3F4F6; --blue:#004A9F; --blue-tint:#E6EEF8;
  --red:#C31918; --red-dark:#A21413; --red-tint:#FBE9E9;
  --head:"Montserrat",system-ui,-apple-system,"Segoe UI",sans-serif;
  --body:"Source Sans 3",system-ui,-apple-system,"Segoe UI",sans-serif;
  --wrap:1200px; --radius:6px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;font-family:var(--body);font-size:1.0625rem;line-height:1.6;color:var(--ink);background:var(--paper)}
img{max-width:100%;height:auto;display:block}
a{color:var(--blue);text-underline-offset:3px}
a:hover{color:var(--red)}
h1,h2,h3,h4{font-family:var(--head);line-height:1.15;margin:0 0 .5em;letter-spacing:-.01em;text-wrap:balance}
h1{font-size:clamp(2.1rem,4.6vw,3.6rem);font-weight:800}
h2{font-size:clamp(1.6rem,3vw,2.4rem);font-weight:700}
h3{font-size:1.2rem;font-weight:700}
p{margin:0 0 1em;text-wrap:pretty}
ul{padding-left:1.2em}
:focus-visible{outline:3px solid var(--blue);outline-offset:2px}
.skip{position:absolute;left:-9999px;top:0;background:var(--ink);color:#fff;padding:.75rem 1rem;z-index:100}
.skip:focus{left:1rem}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 1.25rem}
.eyebrow{font-family:var(--head);font-size:.78rem;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--red);margin-bottom:.75rem;display:block}
.lede{font-size:1.25rem;color:var(--slate);max-width:46rem}
.muted{color:var(--slate)}
.small{font-size:.9rem}

/* Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;font-family:var(--head);font-weight:700;font-size:.95rem;padding:.9rem 1.4rem;border-radius:var(--radius);text-decoration:none;border:2px solid transparent;cursor:pointer;transition:background .15s,color .15s,border-color .15s;min-height:48px}
.btn-primary{background:var(--red);color:#fff}
.btn-primary:hover{background:var(--red-dark);color:#fff}
.btn-secondary{background:transparent;color:var(--ink);border-color:var(--ink)}
.btn-secondary:hover{background:var(--ink);color:#fff}
.on-dark .btn-secondary{color:#fff;border-color:#fff}
.on-dark .btn-secondary:hover{background:#fff;color:var(--ink)}
.btn-row{display:flex;flex-wrap:wrap;gap:.75rem;margin-top:1.75rem}
.link-arrow{font-family:var(--head);font-weight:700;font-size:.92rem;text-decoration:none}
.link-arrow::after{content:" →"}

/* Header */
.topbar{background:var(--ink);color:#C9CED8;font-size:.85rem}
.topbar .wrap{display:flex;justify-content:flex-end;gap:1.5rem;padding-top:.4rem;padding-bottom:.4rem}
.topbar a{color:#C9CED8;text-decoration:none}
.topbar a:hover{color:#fff}
.site-header{position:sticky;top:0;z-index:50;background:#fff;border-bottom:1px solid var(--line)}
.site-header .wrap{display:flex;align-items:center;gap:1.5rem;min-height:76px}
.brand img{width:170px}
.nav{margin-left:auto}
.nav>ul{list-style:none;margin:0;padding:0;display:flex;gap:.25rem}
.nav li{position:relative}
.nav a,.nav button.sub-toggle{font-family:var(--head);font-weight:600;font-size:.85rem;letter-spacing:.04em;text-transform:uppercase;color:var(--ink);text-decoration:none;padding:.75rem .7rem;display:block;background:none;border:0;cursor:pointer}
.nav a:hover,.nav a[aria-current="page"]{color:var(--red)}
.nav .sub{list-style:none;margin:0;padding:.5rem;position:absolute;left:0;top:100%;min-width:260px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 12px 30px rgba(22,27,38,.12);display:none}
.nav .sub a{text-transform:none;letter-spacing:0;font-size:.95rem;padding:.6rem .75rem;border-radius:4px}
.nav .sub a:hover{background:var(--mist)}
.nav li:hover>.sub,.nav li:focus-within>.sub{display:block}
.header-cta{white-space:nowrap}
.menu-toggle{display:none;margin-left:auto;background:none;border:2px solid var(--ink);border-radius:var(--radius);padding:.5rem .8rem;font-family:var(--head);font-weight:700;cursor:pointer;min-height:44px}
@media (max-width:1080px){
  .menu-toggle{display:block}
  .nav,.header-cta{display:none}
  .site-header.open .nav{display:block;position:absolute;left:0;right:0;top:100%;background:#fff;border-bottom:1px solid var(--line);max-height:calc(100vh - 110px);overflow:auto}
  .site-header.open .nav>ul{flex-direction:column;padding:1rem 1.25rem}
  .site-header.open .nav .sub{position:static;display:block;border:0;box-shadow:none;padding:0 0 .5rem 1rem}
  .site-header.open .header-cta{display:flex;position:fixed;left:1.25rem;right:1.25rem;bottom:1rem;z-index:60}
}

/* Breadcrumb */
.crumbs{font-size:.88rem;padding:1rem 0;color:var(--slate)}
.crumbs ol{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:.4rem}
.crumbs li+li::before{content:"/";margin-right:.4rem;color:var(--mute)}
.crumbs a{color:var(--slate)}

/* Hero */
.hero{background:var(--ink) url("../img/hero-bg.png") right center/cover no-repeat;color:#fff;padding:clamp(4rem,10vw,8rem) 0}
.hero .lede{color:#D9DCE1}
.hero h1{max-width:14ch}
.hero-inner{max-width:720px}
.page-hero{background:var(--ink) url("../img/page-bg.png") right bottom/cover no-repeat;color:#fff;padding:clamp(3rem,7vw,5.5rem) 0}
.page-hero .lede{color:#D9DCE1}
.page-hero h1{max-width:20ch;font-size:clamp(2rem,4vw,3.1rem)}
.page-hero .crumbs,.page-hero .crumbs a{color:#B8BFCC}
.page-hero .crumbs{padding-top:0;margin-bottom:1.5rem}
.hero .lede,.page-hero .lede{max-width:34rem}
@media (max-width:1000px){.hero,.page-hero{background-image:none}}

/* Sections */
.section{padding:clamp(3.5rem,7vw,6rem) 0}
.section-alt{background:var(--mist)}
.section-dark{background:var(--ink);color:#fff}
.section-dark .lede,.section-dark .muted{color:#C9CED8}
.section-head{max-width:760px;margin-bottom:2.5rem}
.split{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:clamp(2rem,5vw,4.5rem);align-items:start}
@media (max-width:860px){.split{grid-template-columns:1fr}}

/* Grids & cards */
.grid{display:grid;gap:1.25rem}
.g2{grid-template-columns:repeat(auto-fit,minmax(min(100%,340px),1fr))}
.g3{grid-template-columns:repeat(auto-fit,minmax(min(100%,280px),1fr))}
.g4{grid-template-columns:repeat(auto-fit,minmax(min(100%,230px),1fr))}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:1.75rem;display:flex;flex-direction:column;gap:.25rem}
.card p:last-child{margin-bottom:0}
.card .link-arrow{margin-top:auto;padding-top:1rem}
.section-alt .card{border-color:transparent}
.card-feature{border-top:4px solid var(--red)}
.card-blue{border-top:4px solid var(--blue)}
.tag{display:inline-block;align-self:flex-start;font-family:var(--head);font-size:.7rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;padding:.3rem .6rem;border-radius:3px;background:var(--blue-tint);color:var(--blue);margin-bottom:.75rem}
.tag-red{background:var(--red-tint);color:var(--red)}
.icon{width:44px;height:44px;background:var(--blue);-webkit-mask:var(--i) center/contain no-repeat;mask:var(--i) center/contain no-repeat;margin-bottom:1rem;flex:none}
.icon-red{background:var(--red)}

/* Questions list */
.questions{list-style:none;padding:0;margin:0;display:grid;gap:0;border-top:1px solid var(--line)}
.questions li{font-family:var(--head);font-weight:600;font-size:clamp(1.05rem,1.8vw,1.3rem);padding:1.1rem 0;border-bottom:1px solid var(--line);display:flex;gap:1rem}
.questions li::before{content:"?";color:var(--red);font-weight:800}
.section-dark .questions,.section-dark .questions li{border-color:#2E3545}

/* Outcomes (+/–) */
.outcome{padding:2rem;border-radius:var(--radius);background:#fff;border:1px solid var(--line)}
.outcome .num{font-family:var(--head);font-weight:800;font-size:.85rem;color:var(--red);letter-spacing:.1em}

/* Steps */
.steps{list-style:none;padding:0;margin:0;display:grid;gap:1rem;grid-template-columns:repeat(auto-fit,minmax(min(100%,200px),1fr));counter-reset:s}
.steps li{counter-increment:s;padding:1.5rem;background:#fff;border-radius:var(--radius);border:1px solid var(--line);position:relative}
.steps li::before{content:counter(s,decimal-leading-zero);font-family:var(--head);font-weight:800;font-size:1.6rem;color:var(--red);display:block;margin-bottom:.5rem}
.steps strong{display:block;font-family:var(--head);margin-bottom:.25rem}
.flow{list-style:none;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:.5rem;align-items:center}
.flow li{background:#fff;border:1px solid var(--line);border-radius:999px;padding:.55rem 1rem;font-family:var(--head);font-weight:600;font-size:.9rem}
.flow li+li::before{content:"→";margin-right:.6rem;color:var(--red)}
.section-alt .flow li{border-color:transparent}

/* Stats */
.stats{display:grid;gap:1px;background:var(--line);grid-template-columns:repeat(auto-fit,minmax(min(100%,220px),1fr));border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.stat{background:#fff;padding:1.75rem}
.stat .val{font-family:var(--head);font-weight:800;font-size:clamp(2.2rem,4vw,3.2rem);color:var(--blue);line-height:1;display:block;margin-bottom:.5rem}
.stat .val.red{color:var(--red)}
.source{font-size:.85rem;color:var(--slate);margin-top:1rem}

/* Compare table */
.compare{width:100%;border-collapse:collapse;background:#fff;border-radius:var(--radius);overflow:hidden}
.compare th,.compare td{text-align:left;padding:1rem 1.25rem;border-bottom:1px solid var(--line);vertical-align:top}
.compare thead th{font-family:var(--head);font-size:.8rem;letter-spacing:.1em;text-transform:uppercase}
.compare thead th:first-child{background:var(--red-tint);color:var(--red)}
.compare thead th:last-child{background:var(--blue-tint);color:var(--blue)}
.table-scroll{overflow-x:auto}

/* Integration diagram */
.integration{display:grid;grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);gap:1rem;align-items:stretch}
.integration .node{border-radius:var(--radius);padding:1.5rem;border:2px solid var(--line);background:#fff}
.integration .node.polarity{border-color:var(--blue)}
.integration .join{display:flex;align-items:center;justify-content:center;font-family:var(--head);font-weight:800;color:var(--red);font-size:1.5rem}
.integration ul{margin:.5rem 0 0;padding-left:1.1em;color:var(--slate)}
@media (max-width:720px){.integration{grid-template-columns:1fr}.integration .join{transform:rotate(90deg)}}

/* FAQ */
.faq{border-top:1px solid var(--line)}
.faq details{border-bottom:1px solid var(--line)}
.faq summary{cursor:pointer;list-style:none;padding:1.15rem 2.5rem 1.15rem 0;font-family:var(--head);font-weight:700;position:relative}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:.25rem;top:.9rem;font-size:1.5rem;color:var(--red)}
.faq details[open] summary::after{content:"–"}
.faq details>div{padding:0 0 1.25rem;color:var(--slate);max-width:60rem}

/* CTA band */
.cta-band{background:var(--ink) url("../img/split-bg.png") center/cover no-repeat;color:#fff;position:relative;isolation:isolate}
.cta-band::before{content:"";position:absolute;inset:0;background:rgba(22,27,38,.82);z-index:-1}
.cta-band .wrap{padding-top:clamp(3.5rem,7vw,5.5rem);padding-bottom:clamp(3.5rem,7vw,5.5rem);display:flex;flex-wrap:wrap;gap:2rem;align-items:center;justify-content:space-between}
.cta-band h2{max-width:22ch;margin:0}
.cta-band p{color:#D9DCE1;margin:.75rem 0 0;max-width:40rem}

/* Placeholder (owner input needed) */
.placeholder{border:2px dashed var(--mute);border-radius:var(--radius);padding:1.25rem;color:var(--slate);background:repeating-linear-gradient(135deg,var(--mist) 0 10px,#fff 10px 20px);font-family:ui-monospace,Menlo,Consolas,monospace;font-size:.85rem}
.photo{aspect-ratio:4/5;display:flex;align-items:flex-end;margin-bottom:1rem}

/* Quote */
blockquote{margin:0;font-family:var(--head);font-size:clamp(1.2rem,2.2vw,1.6rem);font-weight:600;line-height:1.35}
blockquote footer{font-family:var(--body);font-size:1rem;font-weight:400;color:var(--slate);margin-top:1rem}

/* Forms */
.form{display:grid;gap:1rem;grid-template-columns:repeat(2,minmax(0,1fr))}
.form .full{grid-column:1/-1}
@media (max-width:640px){.form{grid-template-columns:1fr}}
.field label{display:block;font-weight:600;font-size:.95rem;margin-bottom:.35rem}
.field input,.field select,.field textarea{width:100%;font:inherit;font-size:1rem;padding:.75rem .85rem;border:1px solid #B8BFCC;border-radius:var(--radius);background:#fff;color:var(--ink);min-height:48px}
.field textarea{min-height:120px;resize:vertical}
.field input:focus,.field select:focus,.field textarea:focus{outline:3px solid var(--blue-tint);border-color:var(--blue)}
.field .hint{font-size:.85rem;color:var(--slate);margin-top:.25rem}
.field [aria-invalid="true"]{border-color:var(--red)}
.check{display:flex;gap:.6rem;align-items:flex-start;font-size:.95rem}
.check input{width:20px;height:20px;margin-top:.2rem;flex:none}
.hp{position:absolute;left:-9999px}
.form-panel{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:clamp(1.25rem,3vw,2.25rem)}
.form-status{grid-column:1/-1;padding:1rem;border-radius:var(--radius);display:none}
.form-status.ok{display:block;background:var(--blue-tint);color:var(--blue)}
.form-status.err{display:block;background:var(--red-tint);color:var(--red)}
.req{color:var(--red)}

/* Calculator */
.calc{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,.9fr);gap:0;border-radius:var(--radius);overflow:hidden;border:1px solid var(--line)}
.calc .inputs{background:#fff;padding:clamp(1.25rem,3vw,2.25rem);display:grid;gap:1.1rem}
.calc .output{background:var(--ink);color:#fff;padding:clamp(1.25rem,3vw,2.25rem);display:flex;flex-direction:column;justify-content:center}
.calc .output .val{font-family:var(--head);font-weight:800;font-size:clamp(2rem,4vw,3rem);line-height:1.1;display:block;margin:.25rem 0 1rem}
.calc .output p{color:#C9CED8}
@media (max-width:860px){.calc{grid-template-columns:1fr}}

/* Insights */
.filters{display:flex;flex-wrap:wrap;gap:.5rem;margin-bottom:1.5rem}
.chip{font:inherit;font-size:.9rem;font-weight:600;padding:.5rem 1rem;border-radius:999px;border:1px solid var(--line);background:#fff;cursor:pointer;min-height:40px}
.chip[aria-pressed="true"]{background:var(--ink);color:#fff;border-color:var(--ink)}
.search{max-width:420px;margin-bottom:1rem}
.meta{font-size:.88rem;color:var(--slate)}
.article{max-width:760px}
.article h2{font-size:1.5rem;margin-top:2.5rem}
.article ol>li{margin-bottom:1.25rem}
.article ol>li strong{font-family:var(--head)}
.disclaimer{font-size:.9rem;color:var(--slate);border-top:1px solid var(--line);padding-top:1rem;margin-top:2.5rem}
.routes .card h3{font-size:1.05rem}

/* Footer */
.site-footer{background:var(--ink);color:#B8BFCC;font-size:.95rem;padding:4rem 0 2rem}
.site-footer a{color:#D9DCE1;text-decoration:none}
.site-footer a:hover{color:#fff;text-decoration:underline}
.foot-grid{display:grid;grid-template-columns:1.4fr repeat(4,1fr);gap:2rem}
.foot-grid h2{font-size:.78rem;letter-spacing:.14em;text-transform:uppercase;color:#fff;margin-bottom:1rem}
.foot-grid ul{list-style:none;padding:0;margin:0;display:grid;gap:.5rem}
.foot-brand img{width:170px;margin-bottom:1rem}
.foot-base{border-top:1px solid #2E3545;margin-top:3rem;padding-top:1.5rem;display:flex;flex-wrap:wrap;gap:1rem;justify-content:space-between;font-size:.85rem}
@media (max-width:900px){.foot-grid{grid-template-columns:1fr 1fr}.foot-brand{grid-column:1/-1}}

@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
@media print{.topbar,.site-header,.cta-band,.site-footer{display:none}}