:root{
  --white:#ffffff;
  --navy:#0d1b2f;
  --navy-soft:#22384f;
  --muted:#4a5a6b;
  --line:#dfe5ec;
  --line-strong:#b9c4d1;
  --cobalt:#1d4ed8;
  --cobalt-deep:#173da8;
  --tint:#f3f6fa;
  --focus:#1d4ed8;
  --sans:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,'Liberation Mono',monospace;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;background-color:var(--white)}
body{
  margin:0;padding:0;background-color:var(--white);color:var(--navy);
  font-family:var(--sans);font-size:17px;line-height:1.65;font-weight:400;
  font-kerning:normal;text-rendering:optimizeLegibility;
}
@media(min-width:900px){body{font-size:18px}}
img,svg,picture{max-width:100%}
img{height:auto;display:block}
[hidden]{display:none!important}

/* ---- links ---- */
a{color:var(--cobalt-deep);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:.18em}
a:hover{color:var(--cobalt);text-decoration-thickness:2px}
a:visited{color:#3b2a8c}
:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible,[tabindex]:focus-visible{outline:3px solid var(--focus);outline-offset:2px}
:focus:not(:focus-visible){outline:none}

/* ---- skip ---- */
.skip-link{position:absolute;left:-9999px;top:0;background:var(--navy);color:#fff;padding:.65rem 1.1rem;z-index:50;font-weight:600}
.skip-link:focus{left:.75rem;top:.75rem;color:#fff}

/* ---- header ---- */
.site-header{background-color:var(--white);border-bottom:1px solid var(--line);padding:0 clamp(1rem,4vw,2.5rem)}
.header-inner{max-width:1240px;margin:0 auto;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:.5rem 2rem;padding:1.05rem 0}
.brand{display:inline-block;font-family:var(--sans);font-size:1.18rem;font-weight:600;letter-spacing:-.01em;color:var(--navy);text-decoration:none;line-height:1.2;min-width:0}
.brand:hover{color:var(--navy)}
nav.site-nav{min-width:0}
nav.site-nav ul{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:.25rem 1.7rem;align-items:center}
nav.site-nav li{margin:0;padding:0}
nav.site-nav a{display:inline-block;font-size:.98rem;font-weight:600;color:var(--navy-soft);text-decoration:none;padding:.35rem 0;border-bottom:2px solid transparent}
nav.site-nav a:hover{color:var(--cobalt-deep);border-bottom-color:var(--cobalt)}
nav.site-nav a[aria-current=page]{color:var(--navy);border-bottom-color:var(--navy)}
@media(max-width:620px){
  .header-inner{flex-direction:column;align-items:flex-start;gap:.5rem;padding:.95rem 0}
  nav.site-nav ul{gap:.15rem 1.25rem}
  nav.site-nav a{padding:.25rem 0}
}

/* ---- shells ---- */
div.page.home{max-width:1240px;margin:0 auto;padding:0 clamp(1rem,4vw,2.5rem) 4rem}
article.page.article{max-width:1040px;margin:0 auto;padding:0 clamp(1rem,4vw,2.5rem) 4rem}
div.page.tool.tool-page{max-width:1040px;margin:0 auto;padding:0 clamp(1rem,4vw,2.5rem) 4rem}
main,article,section,aside,fieldset,div{min-width:0}

/* ---- type ---- */
h1,h2,h3,h4{font-family:var(--sans);color:var(--navy);font-weight:600;line-height:1.2;letter-spacing:-.015em;margin:0 0 .5em;overflow-wrap:break-word}
h1{font-size:clamp(2rem,4.4vw,3.25rem);line-height:1.08;letter-spacing:-.025em}
h2{font-size:clamp(1.35rem,2.4vw,1.85rem);letter-spacing:-.02em}
h3{font-size:1.2rem;letter-spacing:-.01em}
h4{font-size:1.02rem;letter-spacing:0}
p,ul,ol{max-width:65ch}
p{margin:0 0 1.1em}
li{margin:.3em 0}
strong{font-weight:600}
small{font-size:.88em}
hr{border:0;border-top:1px solid var(--line);margin:2.2rem 0}

/* ---- hero ---- */
.hero{display:grid;grid-template-columns:minmax(0,1.02fr) minmax(0,1.08fr);gap:clamp(1.5rem,4.5vw,4rem);align-items:center;padding:clamp(2rem,5vw,4.5rem) 0 clamp(2rem,5vw,4rem)}
.eyebrow{font-size:.8rem;font-weight:600;letter-spacing:.16em;text-transform:uppercase;color:var(--cobalt-deep);margin:0 0 1.1rem;max-width:none}
.hero h1{font-size:clamp(36px,5.4vw,68px);max-width:14ch;margin-bottom:1rem}
.hero-deck{font-size:clamp(1.02rem,1.6vw,1.16rem);line-height:1.6;color:var(--muted);max-width:46ch;margin-bottom:1.9rem}
.hero-actions{display:flex;flex-wrap:wrap;gap:.8rem 1rem;align-items:center}
.action{display:inline-block;font-weight:600;font-size:1rem;line-height:1.3;padding:.85rem 1.4rem;text-decoration:none;border:1.5px solid transparent;border-radius:0}
.action-primary,.action-primary:visited{background-color:var(--navy);color:#fff}
.action-primary:hover{background-color:var(--navy-soft);color:#fff;text-decoration:none}
.action-secondary{background-color:transparent;color:var(--navy);border-color:var(--line-strong)}
.action-secondary:hover{background-color:var(--tint);color:var(--navy);border-color:var(--navy-soft);text-decoration:none}
.hero-photo{min-width:0}
.hero-photo:empty{display:none}
.hero-photo figure{margin:0}
.hero-photo picture{display:block}
.hero-photo img{display:block;width:100%;height:auto;max-height:520px;min-height:0;object-fit:cover;background-color:var(--tint)}
.hero-photo figcaption{margin:0}
@media(max-width:860px){
  .hero{grid-template-columns:1fr;gap:1.9rem;padding:2rem 0 2.4rem;align-items:start}
  .hero h1{font-size:40px;max-width:none}
  .hero-photo img{max-height:340px}
}

/* ---- editorial two columns ---- */
.editorial{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);gap:clamp(1.5rem,4vw,3.5rem);padding:clamp(2rem,4vw,3.4rem) 0;border-top:1px solid var(--line)}
.editorial h2{font-size:1.32rem;margin-bottom:.9rem}
.editorial-facts p:last-child{margin-bottom:0}
.editorial-reading ul{list-style:none;margin:0;padding:0;max-width:none}
.editorial-reading li{margin:0;padding:.58rem 0;border-top:1px solid var(--line)}
.editorial-reading li:first-child{border-top:0}
.editorial-reading a{font-weight:600;line-height:1.4;text-decoration:none;border-bottom:1px solid var(--line-strong);padding-bottom:.1em}
.editorial-reading a:hover{border-bottom-color:var(--cobalt)}
@media(max-width:860px){.editorial{grid-template-columns:1fr;gap:2rem}}

/* ---- recording ---- */
.recording{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,240px);gap:clamp(1.5rem,4vw,3rem);align-items:start;padding:clamp(2rem,4vw,3.2rem) 0;border-top:1px solid var(--line)}
.recording h2{margin-bottom:.8rem}
.recording-photo{min-width:0}
.recording-photo:empty{display:none}
.recording-photo figure{margin:0}
.recording-photo picture{display:block}
.recording-photo img{display:block;width:100%;height:auto;max-width:240px;min-height:0;object-fit:cover;background-color:var(--tint)}
.recording-photo figcaption{margin:0}
.inline-link{font-weight:600}
@media(max-width:860px){
  .recording{grid-template-columns:1fr;gap:1.6rem}
  .recording-photo img{max-width:240px}
}

/* ---- closing ---- */
.closing{padding:clamp(2rem,4vw,3.2rem) 0 0;border-top:1px solid var(--line)}
.closing h2{font-size:1.32rem}
.closing-links{font-size:.98rem;color:var(--muted);max-width:none}
.closing-links a{font-weight:600}

/* ---- breadcrumbs ---- */
.breadcrumbs{font-size:.88rem;color:var(--muted);padding:1.4rem 0 .3rem;margin:0 0 1.8rem;border-bottom:1px solid var(--line)}
.breadcrumbs ol{list-style:none;display:flex;flex-wrap:wrap;gap:.35rem;margin:0;padding:0 0 .8rem;max-width:none}
.breadcrumbs li{margin:0;padding:0}
.breadcrumbs li+li::before{content:'/';margin-right:.45rem;color:var(--line-strong)}
.breadcrumbs a{color:var(--cobalt-deep)}

/* ---- article ---- */
.article-header{padding-bottom:1.2rem;margin-bottom:2rem;border-bottom:1px solid var(--line-strong)}
.article-header h1{font-size:clamp(1.9rem,4vw,2.9rem);max-width:20ch;margin-bottom:.4rem}
.article-description{font-size:clamp(1.04rem,1.7vw,1.16rem);color:var(--muted);max-width:60ch;margin-bottom:0}
.article-body{max-width:65ch}
.article-body h2{margin-top:2.2em;margin-bottom:.6em}
.article-body h2:first-child{margin-top:0}
.article-body h3{margin-top:1.7em}
.article-body ul,.article-body ol{padding-left:1.3em}
.article-body blockquote{margin:1.5em 0;padding:.1em 0 .1em 1.2rem;border-left:3px solid var(--cobalt);color:var(--navy-soft)}

/* ---- media figures ---- */
figure{margin:1.6rem 0;max-width:100%;margin-inline:0}
figure.article-figure{margin:1.9rem 0}
figure.article-figure picture{display:block}
figure.article-figure img{display:block;width:100%;height:auto;background-color:var(--tint)}
figure.article-figure figcaption{margin:0}
.media-caption{font-size:12.5px;line-height:1.55;color:var(--muted);padding:.55rem 0 0;max-width:65ch;border-top:1px solid var(--line-strong);margin-top:.55rem}
.media-caption-text{display:block;color:var(--navy-soft)}
.media-credit{display:block;font-size:12px;color:var(--muted);margin-top:.28rem;overflow-wrap:anywhere}
.media-credit a{color:var(--cobalt-deep);text-decoration-thickness:1px}
figcaption{font-size:12.5px;color:var(--muted);overflow-wrap:anywhere}

/* ---- sources ---- */
.sources{margin-top:3rem;padding-top:1.6rem;border-top:1px solid var(--line-strong);font-size:.94rem}
.sources h2,.sources h3{margin-top:0;font-size:1.2rem}
.sources ol,.sources ul{padding-left:1.3em}
.sources li{overflow-wrap:anywhere;margin:.4em 0}
.source-table{display:block;width:100%;max-width:100%;min-width:0;overflow-x:auto;border-collapse:collapse;-webkit-overflow-scrolling:touch;font-size:.92rem;table-layout:fixed}
.source-table caption{display:table-caption;caption-side:top;text-align:left;font-weight:600;padding:.4rem 0 .7rem;color:var(--navy)}
.source-table th,.source-table td{overflow-wrap:anywhere;text-align:left;vertical-align:top;padding:.6rem .7rem;border-bottom:1px solid var(--line)}
.source-table th{background-color:var(--tint);font-weight:600;color:var(--navy)}
.table-scroll{max-width:100%;overflow-x:auto;-webkit-overflow-scrolling:touch;margin:1.4rem 0}
table{max-width:100%;border-collapse:collapse;font-size:.94rem}
th,td{text-align:left;vertical-align:top;padding:.55rem .7rem;border-bottom:1px solid var(--line);overflow-wrap:anywhere}
th{font-weight:600;background-color:var(--tint);color:var(--navy)}

/* ---- lists in profiles ---- */
dl{margin:1.2rem 0}
dt{font-weight:600;margin-top:.8em;color:var(--navy)}
dd{margin:.15em 0 0 0;color:var(--navy-soft)}

/* ---- tool / forms ---- */
.tool-page h1{font-size:clamp(1.9rem,4vw,2.7rem);margin:1.8rem 0 1.2rem;max-width:24ch}
.tool-page section{margin-bottom:2.4rem}
.tool-page h2{font-size:1.3rem;margin-top:1.8rem}
form{max-width:640px;margin:1.4rem 0}
fieldset{border:1px solid var(--line-strong);background-color:var(--white);padding:1.2rem 1.3rem 1.4rem;margin:0 0 1rem;min-width:0}
legend{font-weight:600;font-size:1.06rem;padding:0 .45rem;color:var(--navy)}
label{display:block;font-weight:600;font-size:.94rem;margin:1rem 0 .3rem;color:var(--navy);max-width:34rem}
input,select,textarea{font:inherit;font-size:.98rem;line-height:1.45;color:var(--navy);background-color:var(--white);border:1.5px solid var(--line-strong);border-radius:0;padding:.55rem .65rem;width:100%;max-width:34rem;display:block}
input:hover:not(:disabled),select:hover:not(:disabled),textarea:hover:not(:disabled){border-color:var(--navy-soft)}
textarea{min-height:6rem;resize:vertical}
input[type=date]{max-width:18rem}
input::placeholder,textarea::placeholder{color:var(--muted)}
input:disabled,select:disabled,textarea:disabled,button:disabled{background-color:#eef1f5;color:#41505f;border-color:var(--line-strong);cursor:not-allowed;opacity:1}
button,.button{font:inherit;font-weight:600;font-size:.98rem;line-height:1.3;background-color:var(--navy);color:#fff;border:1.5px solid var(--navy);border-radius:0;padding:.7rem 1.2rem;cursor:pointer;min-height:44px;margin:.4rem .55rem .4rem 0}
button:hover:not(:disabled),.button:hover{background-color:var(--navy-soft);border-color:var(--navy-soft);color:#fff}
button.secondary,.button.secondary{background-color:transparent;color:var(--navy);border-color:var(--line-strong)}
button.secondary:hover:not(:disabled),.button.secondary:hover{background-color:var(--tint);border-color:var(--navy-soft);color:var(--navy)}
button:disabled:hover{background-color:#eef1f5;border-color:var(--line-strong);color:#41505f}
button[type=reset]{background-color:transparent;color:var(--navy-soft);border-color:var(--line-strong)}
button[type=reset]:hover:not(:disabled){background-color:var(--tint);color:var(--navy);border-color:var(--navy-soft)}
#js-note{font-size:.9rem;color:var(--muted);max-width:60ch}
#radon-status{font-size:.96rem;color:var(--navy-soft);max-width:60ch;min-height:0;margin:.5rem 0 0}
#radon-status:empty{display:none}
#radon-status[data-state=warn],#radon-status[data-state=error]{font-weight:600;color:#8a1c1c}
#radon-result{max-width:640px;margin-top:1.2rem;overflow-wrap:anywhere}
#radon-result:empty{display:none}
#radon-result h2,#radon-result h3{margin-top:1.2em;font-size:1.16rem}
#radon-result h2:first-child,#radon-result h3:first-child{margin-top:0}
#radon-result pre{white-space:pre-wrap;overflow-wrap:anywhere;background-color:var(--tint);border:1px solid var(--line);padding:1rem;max-width:100%;font-family:var(--mono);font-size:.88rem;line-height:1.55}
#radon-result p{max-width:60ch}
.tool-status{background-color:var(--tint);border-left:4px solid var(--cobalt);padding:.8rem 1rem;margin:1.2rem 0;max-width:640px;font-size:.95rem;color:var(--navy)}
.tool-status:empty{display:none}
.tool-status[data-state=warn]{border-left-color:#8a1c1c;color:#8a1c1c}
.tool-status[data-state=error]{border-left-color:#8a1c1c;color:#7a1717;font-weight:600}
.record-summary{border:1px solid var(--line-strong);background-color:var(--tint);padding:1.1rem 1.2rem;margin:1.4rem 0;max-width:640px}
.record-summary h2,.record-summary h3{margin-top:0;font-size:1.14rem}
.record-summary dl{display:grid;grid-template-columns:minmax(0,10rem) minmax(0,1fr);gap:.35rem 1rem;margin:0}
.record-summary dt{margin:0;font-size:.92rem;color:var(--navy-soft);overflow-wrap:anywhere}
.record-summary dd{margin:0;font-size:.96rem;color:var(--navy);overflow-wrap:anywhere}
.record-summary p{margin:0 0 .6rem;max-width:60ch}
.date-row{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.4rem 1.1rem;max-width:34rem}
.date-row label{margin-top:1rem}
.date-row input{max-width:none}
@media(max-width:520px){
  .record-summary dl{grid-template-columns:1fr;gap:0}
  .record-summary dt{margin-top:.5rem}
  .date-row{grid-template-columns:1fr;gap:0}
  fieldset{padding:1rem .9rem 1.1rem}
}

/* ---- details / code ---- */
details{border:1px solid var(--line);padding:.7rem 1rem;margin:1.1rem 0;max-width:65ch;background-color:var(--white)}
summary{cursor:pointer;font-weight:600;color:var(--navy)}
code{font-family:var(--mono);font-size:.88em;background-color:var(--tint);border:1px solid var(--line);padding:.06em .3em;overflow-wrap:anywhere}
pre{background-color:var(--tint);border:1px solid var(--line);padding:1rem;overflow-x:auto;max-width:100%;line-height:1.55}
pre code{background:none;border:0;padding:0;white-space:pre-wrap;overflow-wrap:anywhere}

/* ---- footer ---- */
.site-footer{background-color:var(--white);border-top:1px solid var(--line-strong);margin-top:3rem;padding:0 clamp(1rem,4vw,2.5rem)}
.footer-inner{max-width:1240px;margin:0 auto;padding:1.9rem 0 2rem;display:flex;flex-wrap:wrap;gap:1rem 2.5rem;align-items:baseline;justify-content:space-between}
.site-footer p{max-width:56ch;margin:0;font-size:.9rem;color:var(--muted)}
.footer-publisher{font-size:.9rem;color:var(--muted)}
nav.footer-nav{min-width:0}
nav.footer-nav ul{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:.3rem 1.3rem}
nav.footer-nav li{margin:0;padding:0}
nav.footer-nav a{font-size:.9rem;font-weight:600;color:var(--navy-soft);text-decoration:none;border-bottom:1px solid transparent;padding-bottom:.1em}
nav.footer-nav a:hover{color:var(--cobalt-deep);border-bottom-color:var(--cobalt)}
@media(max-width:620px){.footer-inner{flex-direction:column;align-items:flex-start}}

/* ---- tracking pixel ---- */
img.beacon{width:1px;height:1px;min-height:0;position:absolute;visibility:hidden;pointer-events:none;border:0}

/* ---- utilities ---- */
td,th,figcaption,a{overflow-wrap:anywhere}

/* ---- reduced motion / print ---- */
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
@media print{
  body{background:#fff;color:#000;font-size:11pt}
  .site-header,.site-footer,.skip-link,nav.site-nav{display:none}
  a{color:#000;text-decoration:underline}
  a[href^=http]::after{content:' (' attr(href) ')';font-size:9pt}
  div.page.home,article.page.article,div.page.tool.tool-page{max-width:none;padding:0}
  .hero,.editorial,.recording{display:block}
}