:root{
  --ink:#16262d;--ink2:#38484f;--mute:#5f6e75;--paper:#f7f4ed;--paper2:#eee9dc;--rule:#d5cfbf;--white:#fff;
  --teal:#1b6764;--teal-d:#124a48;--tealbg:#e1ecea;--red:#a5302a;--amber:#a8670a;
  --serif:"Newsreader",Georgia,"Times New Roman",serif;--sans:"Figtree",system-ui,-apple-system,"Segoe UI",sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion:no-preference){html{scroll-behavior:smooth}}
body{margin:0;background:var(--paper);color:var(--ink);font:400 1.0625rem/1.65 var(--sans)}
img,svg{max-width:100%;height:auto}
a{color:var(--teal-d);text-underline-offset:.18em;text-decoration-thickness:1px}
a:hover{color:var(--teal);text-decoration-thickness:2px}
:focus-visible{outline:3px solid var(--amber);outline-offset:2px}
.skip{position:absolute;left:-999px;top:0;background:var(--ink);color:#fff;padding:.7rem 1rem;z-index:50}
.skip:focus{left:0}
.wrap{max-width:1180px;margin:0 auto;padding:0 20px}
h1,h2,h3{font-family:var(--serif);font-weight:500;line-height:1.15;color:var(--ink);margin:0}
h1{font-size:clamp(2rem,4.6vw,3.15rem);letter-spacing:-.01em}
h2{font-size:clamp(1.55rem,2.8vw,2rem);margin:2.4rem 0 .8rem}
h3{font-size:1.3rem;margin:1.8rem 0 .5rem}
p{margin:0 0 1.1rem}
.small{font-size:.875rem;color:var(--mute)}
.eyebrow{font:600 .78rem/1.2 var(--sans);text-transform:uppercase;letter-spacing:.12em;color:var(--teal);margin:0 0 .9rem}

/* top strip + header */
.topbar{background:var(--ink);color:#d8e0e2;font-size:.82rem}
.topbar .wrap{display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;padding-top:.45rem;padding-bottom:.45rem}
.topbar p{margin:0}.topbar a{color:#fff;font-weight:600}.topbar .sep{opacity:.5}
header.site{background:var(--paper);border-bottom:1px solid var(--rule)}
header.site .wrap{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding-top:.9rem;padding-bottom:.9rem;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:.6rem;font:600 1.3rem/1 var(--serif);color:var(--ink);text-decoration:none}
.brand svg .bm{fill:none;stroke:var(--ink);stroke-width:2;stroke-linejoin:round}.brand svg .bl{stroke:var(--teal)}
.mainnav ul{list-style:none;margin:0;padding:0;display:flex;gap:.2rem 1.15rem;flex-wrap:wrap;align-items:center}
.mainnav a{color:var(--ink);text-decoration:none;font-weight:500;font-size:.96rem;padding:.35rem 0;border-bottom:2px solid transparent}
.mainnav a:hover,.mainnav a[aria-current]{border-bottom-color:var(--teal);color:var(--ink)}
.mainnav .book a{background:var(--teal);color:#fff;padding:.5rem .9rem;border-radius:2px;border:0}
.mainnav .book a:hover{background:var(--teal-d)}
.menu-btn{display:none;font:600 .95rem var(--sans);background:none;border:1.5px solid var(--ink);padding:.45rem .8rem;border-radius:2px;color:var(--ink)}
@media (max-width:1080px){
  .js .menu-btn{display:block}
  .js .mainnav{display:none;width:100%}.js .mainnav.open{display:block}
  .mainnav ul{flex-direction:column;align-items:flex-start;gap:0;padding-top:.5rem}
  .mainnav li{width:100%;border-top:1px solid var(--rule)}.mainnav a{display:block;padding:.7rem 0}
  .mainnav .book a{display:inline-block;margin:.6rem 0}
  .topbar .hrs,.topbar .sep{display:none}
}

/* breadcrumbs */
.crumbs{max-width:1180px;margin:0 auto;padding:.9rem 20px 0;font-size:.85rem}
.crumbs ol{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:.25rem}
.crumbs li+li::before{content:"/";margin-right:.35rem;color:var(--mute)}
.crumbs a{color:var(--mute)}.crumbs [aria-current]{color:var(--ink)}

main{display:block;padding-bottom:3rem}
.ahead{padding:2.2rem 0 1.4rem;max-width:46rem}
.ahead .dek{font:400 1.3rem/1.45 var(--serif);color:var(--ink2);margin:1rem 0 .6rem}
.ahead .meta{font-size:.85rem;color:var(--mute);margin:.4rem 0 0}

/* buttons */
.btn{display:inline-block;background:var(--teal);color:#fff;border:2px solid var(--teal);padding:.62rem 1.1rem;font:600 1rem var(--sans);text-decoration:none;border-radius:2px;cursor:pointer}
.btn:hover{background:var(--teal-d);border-color:var(--teal-d);color:#fff}
.btn-line{background:transparent;color:var(--teal-d)}.btn-line:hover{background:var(--tealbg);color:var(--teal-d)}

/* home intro */
.intro{padding:2.6rem 0 3rem}
.intro-grid{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,1fr);gap:3rem;align-items:start}
.intro h1{max-width:18ch;font-size:clamp(2.1rem,4.4vw,3.3rem)}
.lede{font:400 1.25rem/1.55 var(--serif);color:var(--ink2);margin:1.2rem 0 0;max-width:36rem}
.callrow{margin:1.6rem 0 .7rem;display:flex;gap:.8rem;flex-wrap:wrap}
@media (max-width:900px){.intro-grid{grid-template-columns:1fr;gap:2rem}.intro h1{max-width:none}}

.band{border-top:1px solid var(--rule);padding:3rem 0}.band.alt{background:var(--paper2)}
.split{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,2fr);gap:3rem}
.split.rev{grid-template-columns:minmax(0,2fr) minmax(0,1fr)}
.split-h h2{margin-top:0}.split-h p{color:var(--ink2)}
@media (max-width:860px){.split,.split.rev{grid-template-columns:1fr;gap:1.2rem}}

/* article grid */
.article-grid{display:grid;grid-template-columns:minmax(0,1fr) 290px;gap:3.5rem;align-items:start}
.prose{max-width:46rem}.prose.narrow,.narrow{max-width:46rem}
.prose h2{border-top:1px solid var(--rule);padding-top:1.4rem;margin-top:2.6rem}
.prose h2:first-of-type{margin-top:1.6rem}
.prose ul,.prose ol{padding-left:1.3rem;margin:0 0 1.2rem}.prose li{margin-bottom:.45rem}
.side{position:sticky;top:1.2rem;font-size:.95rem}
.side h2{font:600 .78rem var(--sans);text-transform:uppercase;letter-spacing:.12em;color:var(--mute);border:0;margin:0 0 .6rem;padding:0}
.side>*{border-top:2px solid var(--ink);padding-top:.9rem;margin-bottom:1.6rem}
.side ol,.side ul{list-style:none;margin:0;padding:0}.side li{padding:.28rem 0;border-bottom:1px solid var(--rule)}
.side li.sub{padding-left:1rem;font-size:.9rem}
.side a{text-decoration:none}.side a:hover{text-decoration:underline}
@media (max-width:980px){.article-grid{grid-template-columns:1fr;gap:1rem}.side{position:static}}
.note{border-left:4px solid var(--teal);background:var(--tealbg);padding:.9rem 1.1rem;margin:1.6rem 0}.note p{margin:0}
.enquire{border-top:2px solid var(--ink);margin-top:3rem;padding-top:1.1rem}
.enquire h2{border:0;padding:0;margin:0 0 .5rem;font-size:1.4rem}.enquire p{margin:0}
.prose code{font-size:.9em;background:var(--paper2);padding:.05em .3em}

/* tables */
.tblwrap{overflow-x:auto;margin:1.4rem 0}
.tbl{width:100%;border-collapse:collapse;font-size:.97rem}
.tbl th,.tbl td{text-align:left;vertical-align:top;padding:.7rem .8rem .7rem 0;border-top:1px solid var(--rule)}
.tbl thead th{font:600 .75rem var(--sans);text-transform:uppercase;letter-spacing:.1em;color:var(--mute);border-top:2px solid var(--ink);border-bottom:1px solid var(--ink)}
.tbl tbody th{font-weight:600;width:28%}
.tbl tbody tr:last-child th,.tbl tbody tr:last-child td{border-bottom:1px solid var(--ink)}
.stack tbody th{width:22%}
@media (max-width:640px){
  .tbl thead{position:absolute;left:-9999px}
  .tbl,.tbl tbody,.tbl tr,.tbl th,.tbl td{display:block;width:100%!important}
  .tbl tr{border-top:1px solid var(--rule);padding:.6rem 0}.tbl th,.tbl td{border:0!important;padding:.15rem 0}
  .tbl td[data-label]::before{content:attr(data-label) ": ";font-weight:600;color:var(--mute);font-size:.85em}
}
.ph{background:#f3e3bf;padding:.1em .4em;border-bottom:1px dotted var(--amber)}

/* lists */
.biglist{list-style:none;margin:0;padding:0}
.biglist li{border-top:1px solid var(--rule);padding:.9rem 0}.biglist li:last-child{border-bottom:1px solid var(--rule)}
.biglist a{font:500 1.3rem/1.25 var(--serif);text-decoration:none;color:var(--ink)}.biglist a:hover{color:var(--teal);text-decoration:underline}
.biglist span{display:block;color:var(--ink2);font-size:.95rem;margin-top:.25rem}
.deflist dt{font:500 1.25rem var(--serif);margin-top:1rem;border-top:1px solid var(--rule);padding-top:.7rem}.deflist dt:first-child{margin-top:0}
.deflist dd{margin:.15rem 0 0;color:var(--ink2);font-size:.95rem}
.checklist{list-style:none;padding-left:0!important}
.checklist li{display:flex;gap:.7rem;align-items:flex-start;border-bottom:1px dotted var(--rule);padding-bottom:.45rem}
.checklist .box{flex:none;width:1.05rem;height:1.05rem;border:2px solid var(--ink2);margin-top:.28rem;background:#fff}
.gsec{padding:1.6rem 0;border-top:2px solid var(--ink)}
.smgrid{display:grid;grid-template-columns:1fr 1fr;gap:1rem 3rem}@media(max-width:800px){.smgrid{grid-template-columns:1fr}}
.smlist{list-style:none;padding:0;margin:0}.smlist li{padding:.5rem 0;border-top:1px solid var(--rule)}.smlist a{font-weight:600}.smlist span{display:block;font-size:.88rem;color:var(--mute)}

/* diagrams */
.diagram{margin:1.8rem 0;border:1px solid var(--rule);background:#fff;padding:1rem}
.diagram svg{display:block;width:100%;height:auto}
.diagram figcaption{margin-top:.8rem;font-size:.9rem;color:var(--ink2)}.diagram .cap{display:block;font-style:italic;font-family:var(--serif);font-size:1rem;margin-bottom:.5rem}
.legend{list-style:none;margin:0;padding:0;columns:2;column-gap:2rem}.legend li{break-inside:avoid;padding:.15rem 0}.legend b{display:inline-block;min-width:1.4rem;color:var(--teal-d)}
@media(max-width:640px){.legend{columns:1}}
.intro-fig .diagram{margin:0}
.d-ln{fill:none;stroke:var(--ink);stroke-width:1.6;stroke-linejoin:round;stroke-linecap:round}
.d-heavy,.d-thick{stroke-width:3}.d-dash{stroke-dasharray:7 5}.d-dashf{stroke-dasharray:3 4}
.d-teal{stroke:var(--teal)}.d-red{stroke:var(--red)}.d-amber{stroke:var(--amber)}.d-blue{stroke:#456f88}.d-water{stroke:#456f88;stroke-width:2;stroke-dasharray:4 4}
.d-fill{fill:var(--paper2)}.d-paper{fill:#fff}.d-soil{fill:#e6dec9;stroke:none}.d-wet{fill:rgba(165,48,42,.3);stroke:none}.d-wetl{fill:rgba(165,48,42,.16);stroke:none}
.d-clad,.d-sheath,.d-insul,.d-board,.d-gap{stroke:var(--ink);stroke-width:1}
.d-clad{fill:#d7cdb6}.d-sheath{fill:#c4b283}.d-insul{fill:#f3e8bc}.d-board{fill:#e8e8e2}.d-gap{fill:#fff}
.d-arrow{fill:var(--teal)}
.d-pin circle{fill:var(--ink)}.d-pin.c circle{fill:var(--red)}.d-pin text{fill:#fff;font:700 12px var(--sans)}
.d-t{font:13px var(--sans);fill:var(--ink)}.d-b{font-weight:700}.d-mute{fill:var(--mute);font-size:11px}
.d-lead line{stroke:var(--mute);stroke-width:1;stroke-dasharray:3 3}
.m-bg{fill:var(--paper2)}.m-water{fill:#d3e1e2}.m-land{fill:#fff;stroke:var(--ink);stroke-width:1.4}.m-land.big{fill:#f6f1e1}
a:hover .m-land{fill:var(--tealbg)}a:focus-visible .m-land{stroke:var(--amber);stroke-width:3}
.m-t{font:600 12px var(--sans);fill:var(--ink)}.m-w{font:italic 12px var(--serif);fill:var(--mute)}
.sketch{display:block;width:100%;max-width:230px;border:1px solid var(--rule);background:#fff}

/* severity + report */
.sev{display:inline-block;font:700 .68rem/1 var(--sans);text-transform:uppercase;letter-spacing:.08em;padding:.28rem .45rem;border:1.5px solid;border-radius:2px;vertical-align:middle;white-space:nowrap}
.sev-safety{background:var(--red);border-color:var(--red);color:#fff}
.sev-major{background:var(--amber);border-color:var(--amber);color:#fff}
.sev-repair{border-color:var(--ink);color:var(--ink)}
.sev-maintenance{border-color:var(--mute);color:var(--mute)}
.sev-monitor{border:1.5px dashed var(--mute);color:var(--mute)}
.rkey p{display:flex;gap:.8rem;align-items:baseline;margin:0 0 .5rem;font-size:.95rem}.rkey .sev{flex:none;min-width:6.4rem;text-align:center}
.rhead{border-top:2px solid var(--ink);border-bottom:1px solid var(--ink);margin:1rem 0}
.rhead dl{display:grid;grid-template-columns:1fr 1fr;margin:0}.rhead div{padding:.55rem 0;border-bottom:1px solid var(--rule)}
.rhead dt{font:600 .72rem var(--sans);text-transform:uppercase;letter-spacing:.1em;color:var(--mute)}.rhead dd{margin:0}
@media(max-width:560px){.rhead dl{grid-template-columns:1fr}}
.ratekey div{display:grid;grid-template-columns:7.5rem 1fr;gap:1rem;padding:.5rem 0;border-top:1px solid var(--rule);align-items:baseline}.ratekey dt,.ratekey dd{margin:0}
@media(max-width:560px){.ratekey div{grid-template-columns:1fr;gap:.2rem}}
.finding{display:grid;grid-template-columns:230px minmax(0,1fr);gap:1.4rem;border-top:1px solid var(--rule);padding:1.2rem 0;margin-top:.5rem}
.finding:not(:has(figure)){grid-template-columns:1fr}
.finding figure{margin:0}.finding figcaption{font-size:.8rem;color:var(--mute);margin-top:.4rem;line-height:1.4}
.finding .fh{margin:0 0 .5rem;display:flex;gap:.6rem;flex-wrap:wrap;align-items:center}.finding .ref{font:600 .85rem var(--sans);color:var(--mute)}
.finding p{margin-bottom:.6rem}.finding .rec{font-size:.97rem;color:var(--ink2)}
@media(max-width:640px){.finding{grid-template-columns:1fr}}
.report .tbl td{font-size:.95rem}

/* timeline */
.timeline{list-style:none;margin:1.5rem 0;padding:0}
.timeline li{display:grid;grid-template-columns:9.5rem minmax(0,1fr);gap:1.4rem;border-top:1px solid var(--rule);padding:1.1rem 0}
.tl-when span{font:500 1.35rem/1.15 var(--serif);color:var(--teal-d);display:block}
.timeline h3{margin:0 0 .4rem;font-size:1.25rem}.timeline p{margin:0 0 .6rem}.tl-watch{font-size:.95rem;color:var(--ink2);border-left:3px solid var(--rule);padding-left:.8rem}
@media(max-width:640px){.timeline li{grid-template-columns:1fr;gap:.3rem}}

/* faq */
.faqgroup{margin-bottom:2rem}.qa{border-top:1px solid var(--rule);padding:.2rem 0 .4rem}.qa h3{font-size:1.2rem;margin:1rem 0 .5rem}

/* forms */
.contact-grid{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(0,1fr);gap:3.5rem;align-items:start}
@media(max-width:900px){.contact-grid{grid-template-columns:1fr;gap:2rem}}
.form h2,.contact-side h2{margin-top:0}.contact-side h2{font-size:1.2rem;margin-top:1.6rem}.contact-side h2:first-child{margin-top:0}
.field{margin-bottom:1.1rem}.field label{display:block;font-weight:600;font-size:.95rem;margin-bottom:.3rem}
.field input,.field select,.field textarea{width:100%;font:inherit;color:var(--ink);background:#fff;border:1.5px solid var(--ink2);border-radius:2px;padding:.6rem .7rem}
.field input:focus,.field select:focus,.field textarea:focus{outline:3px solid var(--amber);outline-offset:1px}
.field .hint{display:block;font-size:.82rem;color:var(--mute);margin-top:.25rem}
.field.bad input,.field.bad select{border-color:var(--red)}.field .err{color:var(--red);font-size:.85rem;display:block;margin-top:.25rem}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:0 1.2rem}@media(max-width:560px){.row2{grid-template-columns:1fr}}
.done{border:2px solid var(--teal);background:var(--tealbg);padding:1.4rem}.done h2{margin-top:0}
.contact-side{border-left:1px solid var(--rule);padding-left:2rem}@media(max-width:900px){.contact-side{border:0;padding:0}}
.bigphone{font:500 2rem/1 var(--serif);margin-bottom:.6rem}.bigphone a{text-decoration:none;color:var(--ink)}

/* footer */
footer.site{background:var(--ink);color:#cfd9db;padding:3rem 0 2rem;margin-top:2rem;font-size:.92rem}
footer.site a{color:#fff;text-decoration-color:rgba(255,255,255,.4)}
footer.site :focus-visible{outline-color:#fff}
.fgrid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:2rem}
@media(max-width:1000px){.fgrid{grid-template-columns:repeat(3,minmax(0,1fr))}}@media(max-width:620px){.fgrid{grid-template-columns:1fr 1fr}}@media(max-width:420px){.fgrid{grid-template-columns:1fr}}
footer.site h2{font:600 .75rem var(--sans);text-transform:uppercase;letter-spacing:.12em;color:#9fb0b4;margin:0 0 .8rem}
footer.site ul{list-style:none;margin:0;padding:0}footer.site li{margin-bottom:.35rem}footer.site p{margin:0 0 .6rem}
footer.site .small{color:#9fb0b4;max-width:60rem;margin-top:1.4rem;font-size:.8rem}

@media (max-width:480px){.brand{font-size:1.05rem}.brand svg{width:24px;height:24px}header.site .wrap{flex-wrap:nowrap}}