/* ================================================================
   PURLIN SAFETY — purlinsafety.com
   Built to Brand Guidelines v1.0 (August 2026)

   PALETTE — "Deepwater". Do not add colours to this list.
   PROPORTION — ~60% ground (Paper/Mist), 30% Ink, 7% Tidal, 3% Mint.
   HARD RULE — Mint is NEVER text or a background on a light ground
               (1.95:1, fails every standard). Mint only ever appears
               on Purlin Ink, where it measures 8.59:1 and passes AAA.
   TYPE — Archivo 800/700/600 only, never lighter than 600.
          Inter 400/500 for body. Fallbacks: Arial Bold / Arial.
   ================================================================ */

:root{
  --ink:#06202F;        /* Purlin Ink — primary. Body type, headings, dark grounds */
  --tidal:#10788C;      /* Tidal — secondary. Subheads, links, rules */
  --mint:#45CFAE;       /* Mint — accent. ON INK ONLY */
  --mist:#EDF3F3;       /* Mist — light ground. Panels, table fills */
  --steel:#5C7078;      /* Steel — support. Captions, metadata, rules */
  --paper:#FFFFFF;      /* Paper — ground */

  /* derived, for grounds and hairlines only — not new brand colours */
  --ink-panel:#0B2C3E;
  --ink-line:#1B3B4C;
  --steel-up:#9DB2BB;   /* Steel lightened for captions ON Ink — 7.58:1 */
  --body-on-light:#3B5765;
  --lede-on-light:#2C4756;
  --line:#DDE6E7;

  --f-display:'Archivo',Arial,Helvetica,system-ui,sans-serif;
  --f-body:'Inter','Segoe UI',Arial,system-ui,sans-serif;

  --wrap:1120px;
  --pad:clamp(20px,5vw,44px);
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{
  margin:0;background:var(--paper);color:var(--ink);
  font-family:var(--f-body);font-size:16px;line-height:1.62;font-weight:400;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
  display:flex;flex-direction:column;min-height:100vh;
}
main{flex:1 0 auto}
img,svg{max-width:100%;display:block}
p{margin:0}
a{color:var(--tidal)}
a:hover{color:#0C6376}

/* ---------------- type scale (section 07) ---------------- */
h1,h2,h3,h4{font-family:var(--f-display);margin:0;letter-spacing:-.02em;color:var(--ink)}
h1{font-weight:800;font-size:clamp(2.375rem,5.4vw,3.375rem);line-height:1.08}   /* 38–54px */
h2{font-weight:700;font-size:clamp(1.75rem,3.4vw,1.875rem);line-height:1.16}    /* 28–30px */
h3{font-weight:700;font-size:1.1875rem;line-height:1.32;letter-spacing:-.012em} /* 19px */
h4{font-weight:600;font-size:1rem;line-height:1.35;letter-spacing:-.008em}
.label{
  font-family:var(--f-display);font-weight:700;font-size:.6875rem;letter-spacing:.2em;
  text-transform:uppercase;color:var(--steel);line-height:1.5;
}
.on-ink .label{color:var(--steel-up)}
.caption{font-size:.78125rem;color:var(--steel);line-height:1.55}
.lede{font-size:1.0625rem;line-height:1.6;color:var(--lede-on-light);max-width:63ch}
.on-ink .lede{color:var(--mist)}
.prose p{color:var(--body-on-light);max-width:70ch}
.prose p+p{margin-top:1rem}
.on-ink .prose p{color:var(--mist)}

.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding-inline:var(--pad)}
/* Narrow measure for long-form prose. The outer .wrap keeps the page's normal
   centred width so the left edge stays flush with every other section; only the
   content inside it is capped. Centring the wrap itself indents the column and
   breaks the alignment down the page. */
.narrow{max-width:840px}
.wrap.narrow{max-width:var(--wrap)}
.wrap.narrow>*{max-width:840px}
section{padding-block:clamp(3.5rem,7.5vw,5.5rem)}
.on-ink{background:var(--ink);color:var(--mist)}
.on-ink h1,.on-ink h2,.on-ink h3,.on-ink h4{color:var(--paper)}
.on-mist{background:var(--mist)}
.sec-head{max-width:66ch;margin-bottom:clamp(2.25rem,4.5vw,3.25rem)}
.sec-head h2{margin:.85rem 0 1rem}
.sec-head.center{margin-inline:auto;text-align:center}
.sec-head.center .label{justify-content:center}

/* ---------------- buttons ---------------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.55rem;
  font-family:var(--f-display);font-weight:700;font-size:.9375rem;line-height:1.2;
  padding:.875rem 1.45rem;border-radius:3px;border:1.5px solid transparent;
  text-decoration:none;cursor:pointer;transition:background .16s,border-color .16s,color .16s;
}
.btn svg{width:15px;height:15px;flex:none}
.btn-primary{background:var(--tidal);color:var(--paper);border-color:var(--tidal)}   /* 5.14:1 */
.btn-primary:hover{background:#0C6376;border-color:#0C6376;color:var(--paper)}
.btn-line{background:transparent;color:var(--ink);border-color:#B9C8CC}
.btn-line:hover{border-color:var(--ink);background:var(--mist);color:var(--ink)}
/* on Ink grounds Mint is the highlight — 8.59:1 with Ink text */
.on-ink .btn-primary{background:var(--mint);color:var(--ink);border-color:var(--mint)}
.on-ink .btn-primary:hover{background:#5FDCBD;border-color:#5FDCBD;color:var(--ink)}
.on-ink .btn-line{color:var(--paper);border-color:#33586A}
.on-ink .btn-line:hover{border-color:var(--mist);background:rgba(237,243,243,.07);color:var(--paper)}
.btn-row{display:flex;flex-wrap:wrap;gap:.75rem}
:where(a,button,input,textarea,select,summary):focus-visible{outline:3px solid var(--tidal);outline-offset:3px}
.on-ink :where(a,button,input,textarea,select,summary):focus-visible{outline-color:var(--mint)}

/* inline text link with arrow */
.link-on{
  display:inline-flex;align-items:center;gap:.45rem;font-family:var(--f-display);
  font-weight:700;font-size:.9375rem;color:var(--tidal);text-decoration:none;
}
.link-on svg{width:14px;height:14px;transition:transform .16s}
.link-on:hover svg{transform:translateX(3px)}
.on-ink .link-on{color:var(--mint)}

/* ---------------- header ---------------- */
header.site{position:sticky;top:0;z-index:60;background:var(--ink);border-bottom:1px solid var(--ink-line)}
.navbar{display:flex;align-items:center;gap:1.75rem;min-height:72px}
.logo{display:flex;align-items:center;text-decoration:none;flex:none}
.logo img{height:32px;width:auto}
nav.main{margin-left:auto;display:flex;align-items:center;gap:1.55rem}
nav.main a{color:var(--mist);text-decoration:none;font-size:.9375rem;font-weight:500;padding:.35rem 0;position:relative}
nav.main a::after{content:"";position:absolute;left:0;bottom:-2px;height:2px;width:0;background:var(--mint);transition:width .18s}
nav.main a:hover{color:var(--paper)}
nav.main a:hover::after{width:100%}
nav.main a[aria-current="page"]{color:var(--paper)}
nav.main a[aria-current="page"]::after{width:100%}
.nav-cta{padding:.62rem 1.05rem;font-size:.84375rem;white-space:nowrap}
.nav-cta::after{display:none!important}
.burger{margin-left:auto;display:none;background:none;border:0;padding:.5rem;cursor:pointer}
.burger span{display:block;width:23px;height:2px;background:var(--mist);margin:5px 0;transition:.22s}
.burger[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.burger[aria-expanded="true"] span:nth-child(2){opacity:0}
.burger[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
@media (max-width:980px){
  nav.main{position:fixed;inset:72px 0 auto 0;background:var(--ink);flex-direction:column;
    align-items:stretch;gap:0;padding:.25rem var(--pad) 1.5rem;border-bottom:1px solid var(--ink-line);
    transform:translateY(-130%);transition:transform .25s cubic-bezier(.4,0,.2,1);
    max-height:calc(100dvh - 72px);overflow-y:auto}
  nav.main.open{transform:translateY(0)}
  nav.main a{padding:.95rem 0;border-bottom:1px solid var(--ink-line);font-size:1rem}
  nav.main a::after{display:none}
  .nav-cta{margin-top:1.1rem;border-bottom:0!important;justify-content:center}
  .burger{display:block}
}

/* ---------------- hero / page headers ---------------- */
.hero{background:var(--ink);color:var(--mist);padding-block:clamp(3.5rem,8vw,5.75rem)}
.tagline{
  font-family:var(--f-display);font-weight:600;font-size:.9375rem;letter-spacing:.02em;
  color:var(--mint);margin-bottom:1.5rem;
}
.hero h1{max-width:20ch;margin-bottom:1.5rem}
.hero .lede{max-width:58ch}
.hero-actions{margin-top:2.25rem}
.hero-meta{margin-top:2.75rem;padding-top:1.5rem;border-top:1px solid var(--ink-line);
  display:flex;flex-wrap:wrap;gap:.5rem 2rem}
.hero-meta span{font-size:.78125rem;color:var(--steel-up)}

.pagehead{background:var(--ink);color:var(--mist);padding-block:clamp(2.75rem,6vw,4.25rem)}
.pagehead h1{max-width:22ch;margin:.9rem 0 1.15rem;font-size:clamp(2.125rem,4.6vw,2.875rem)}
.pagehead .lede{max-width:60ch}
.crumb{font-size:.78125rem;color:var(--steel-up)}
.crumb a{color:var(--steel-up);text-decoration:none}
.crumb a:hover{color:var(--mint)}

/* ---------------- quote band ---------------- */
.quote-band{background:var(--mist);padding-block:clamp(2.75rem,6vw,4rem)}
.quote{
  border-left:4px solid var(--tidal);padding-left:clamp(1.1rem,2.5vw,1.75rem);
  font-family:var(--f-display);font-weight:700;font-size:clamp(1.25rem,2.7vw,1.6rem);
  line-height:1.32;letter-spacing:-.018em;color:var(--ink);max-width:44ch;margin:0;
}
.quote-grid{display:grid;grid-template-columns:1fr auto;gap:clamp(1.75rem,4vw,3rem);align-items:center}
.quote-grid figure{margin:0;flex:none}
.quote-grid svg{width:clamp(130px,17vw,190px);height:auto}
.quote-grid figcaption{margin-top:.6rem;text-align:center}
@media (max-width:760px){.quote-grid{grid-template-columns:1fr}.quote-grid figure{order:-1}}

/* ---------------- grids ---------------- */
.grid-4{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(240px,100%),1fr));gap:1px;
  background:var(--line);border:1px solid var(--line)}
.grid-4>div{background:var(--paper);padding:1.6rem 1.4rem}
.on-mist .grid-4{background:#D6E3E4;border-color:#D6E3E4}
.on-mist .grid-4>div{background:var(--mist)}
.grid-4 b{display:block;font-family:var(--f-display);font-weight:700;font-size:1.1875rem;
  letter-spacing:-.012em;color:var(--ink);margin-bottom:.45rem}
.grid-4 p{font-size:.9375rem;color:var(--body-on-light)}

.cols-3{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(270px,100%),1fr));gap:1.75rem}
.cols-2{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(320px,100%),1fr));gap:1.75rem}
.rule-top{border-top:3px solid var(--tidal);padding-top:1.1rem}
.rule-top h3{margin-bottom:.5rem}
.rule-top p{font-size:.9375rem;color:var(--body-on-light)}
.on-ink .rule-top{border-top-color:var(--mint)}
.on-ink .rule-top p{color:var(--mist)}

/* ---------------- numbered service list ---------------- */
.sell{display:grid;gap:1px;background:var(--line);border:1px solid var(--line)}
.on-mist .sell{background:#D6E3E4;border-color:#D6E3E4}
.sell article{
  background:var(--paper);display:grid;grid-template-columns:auto 1fr;
  gap:clamp(1rem,3vw,2.25rem);padding:clamp(1.6rem,3.5vw,2.1rem) clamp(1.3rem,3vw,2rem);
}
.on-mist .sell article{background:var(--mist)}
.sell .idx{font-family:var(--f-display);font-weight:800;font-size:1.125rem;color:var(--tidal);
  letter-spacing:.02em;padding-top:.15rem;min-width:2.2ch}
.sell h3{margin-bottom:.5rem}
.sell p{font-size:.96875rem;color:var(--body-on-light);max-width:70ch}
.sell p+p{margin-top:.7rem}
.sell .tag{display:inline-block;margin-top:.9rem;font-family:var(--f-display);font-weight:700;
  font-size:.6875rem;letter-spacing:.14em;text-transform:uppercase;color:var(--tidal);
  background:var(--mist);padding:.3rem .6rem;border-radius:2px}
.on-mist .sell .tag{background:var(--paper)}
@media (max-width:560px){.sell article{grid-template-columns:1fr;gap:.5rem}}

/* deliverable lists */
.ticks{list-style:none;padding:0;margin:1.1rem 0 0;display:grid;gap:.55rem}
.ticks li{position:relative;padding-left:1.6rem;font-size:.9375rem;color:var(--body-on-light)}
.ticks li::before{content:"";position:absolute;left:0;top:.5em;width:8px;height:8px;
  border:2px solid var(--tidal);border-top:0;border-left:0;transform:rotate(45deg) translateY(-2px)}
.on-ink .ticks li{color:var(--mist)}
.on-ink .ticks li::before{border-color:var(--mint)}

/* ---------------- panels on Ink ---------------- */
.ink-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(280px,100%),1fr));gap:1.25rem}
.ink-cards article{background:var(--ink-panel);border:1px solid var(--ink-line);
  border-top:3px solid var(--mint);padding:clamp(1.5rem,3vw,1.9rem)}
.ink-cards h3{margin-bottom:.65rem;font-size:1.0625rem}
.ink-cards p{font-size:.9375rem;color:var(--mist)}

/* ---------------- not this / this ---------------- */
.pair{display:grid;grid-template-columns:1fr 1fr;gap:1.25rem}
@media (max-width:760px){.pair{grid-template-columns:1fr}}
.pair>div{padding:1.4rem 1.5rem;border-radius:3px}
.pair .no{background:#FBEDEC;border:1px solid #F2D5D2}
.pair .yes{background:#E4F2EE;border:1px solid #C6E3DB}
.pair .flag{display:inline-block;font-family:var(--f-display);font-weight:700;font-size:.625rem;
  letter-spacing:.16em;text-transform:uppercase;padding:.22rem .5rem;border-radius:2px;margin-bottom:.7rem}
.pair .no .flag{background:#B3382B;color:#fff}
.pair .yes .flag{background:var(--tidal);color:#fff}
.pair p{font-size:.9375rem;color:var(--lede-on-light)}
.contrast-label{font-family:var(--f-display);font-weight:700;font-size:.6875rem;letter-spacing:.2em;
  text-transform:uppercase;color:var(--steel);margin-bottom:.9rem}
.contrast-stack{display:grid;gap:1.75rem}

/* ---------------- callout ---------------- */
.callout{background:var(--mist);border-left:4px solid var(--tidal);padding:1.4rem 1.6rem;border-radius:0 3px 3px 0}
.callout h4{margin-bottom:.5rem}
.callout p{font-size:.9375rem;color:var(--lede-on-light);max-width:68ch}
.on-mist .callout{background:var(--paper)}


/* ---------------- photographs ----------------
   Brand deck section 10: real crews on real sites. Never stock office imagery.
   Sources are 1400–1800px so these can run full width. Swap any file in
   assets/img/photos/ keeping the filename and nothing else needs changing. */
.photo{margin:0}
.photo img{
  width:100%;height:auto;object-fit:cover;display:block;
  background:var(--mist);border-radius:3px;
}
.photo.ar-3x2 img{aspect-ratio:3/2}
.photo.ar-4x5 img{aspect-ratio:4/5}
.photo figcaption{margin-top:.65rem;max-width:60ch}

/* image beside text — image column first on desktop, image first on mobile too */
.photo-pair{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,6fr);
  gap:clamp(1.5rem,4vw,3rem);align-items:center}
.photo-pair.flip{grid-template-columns:minmax(0,6fr) minmax(0,5fr)}
@media (max-width:820px){.photo-pair,.photo-pair.flip{grid-template-columns:1fr}}
.photo-pair h3{margin-bottom:.6rem}
.photo-pair p{font-size:.9375rem;color:var(--body-on-light);max-width:48ch}
.on-ink .photo-pair p{color:var(--mist)}

/* ---------------- photo slot (dashed placeholder, legacy) ---------------- */
.photo-slot{
  background:var(--mist);border:1px dashed #B7CBCE;border-radius:3px;
  display:flex;align-items:center;justify-content:center;text-align:center;
  padding:2rem 1.5rem;min-height:220px;
}
.on-mist .photo-slot{background:var(--paper)}
.photo-slot p{font-size:.8125rem;color:var(--steel);max-width:34ch}
.photo-slot b{display:block;font-family:var(--f-display);font-weight:700;font-size:.6875rem;
  letter-spacing:.2em;text-transform:uppercase;color:var(--tidal);margin-bottom:.5rem}

/* ---------------- FAQ ---------------- */
.faq{max-width:880px;border-top:1px solid var(--line)}
.faq details{border-bottom:1px solid var(--line)}
.faq summary{cursor:pointer;list-style:none;padding:1.35rem 2.75rem 1.35rem 0;position:relative;
  font-family:var(--f-display);font-weight:700;font-size:1.0625rem;letter-spacing:-.012em;color:var(--ink)}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"";position:absolute;right:.35rem;top:50%;width:11px;height:11px;
  border-right:2.5px solid var(--tidal);border-bottom:2.5px solid var(--tidal);
  transform:translateY(-70%) rotate(45deg);transition:transform .2s}
.faq details[open] summary::after{transform:translateY(-20%) rotate(-135deg)}
.faq .ans{padding:0 1.5rem 1.5rem 0;max-width:72ch;font-size:.96875rem;color:var(--body-on-light)}
.faq .ans p+p{margin-top:.75rem}

/* ---------------- steps ---------------- */
.steps{display:grid;gap:0;counter-reset:st}
.steps li{list-style:none;display:grid;grid-template-columns:auto 1fr;gap:clamp(1rem,3vw,2rem);
  padding:1.5rem 0;border-top:1px solid var(--line)}
.steps li:last-child{border-bottom:1px solid var(--line)}
.steps .n{font-family:var(--f-display);font-weight:800;font-size:1.125rem;color:var(--tidal);min-width:2.2ch}
.on-ink .steps li{border-color:var(--ink-line)}
.on-ink .steps .n{color:var(--mint)}
.steps h3{margin-bottom:.4rem}
.steps p{font-size:.9375rem;color:var(--body-on-light);max-width:68ch}
.on-ink .steps p{color:var(--mist)}

/* ---------------- contact ---------------- */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:clamp(2rem,5vw,4rem);align-items:start}
@media (max-width:880px){.contact-grid{grid-template-columns:1fr}}
.contact-list{list-style:none;padding:0;margin:2rem 0 0;display:grid;gap:1rem}
.contact-list li{display:flex;gap:.85rem;align-items:flex-start;font-size:.96875rem;color:var(--mist)}
.contact-list svg{width:18px;height:18px;flex:none;margin-top:.22rem;stroke:var(--mint);fill:none;stroke-width:1.7}
.contact-list a{color:var(--paper);text-decoration:none;border-bottom:1px solid rgba(69,207,174,.5)}
.contact-list a:hover{color:var(--mint)}
form.enquiry{background:var(--ink-panel);border:1px solid var(--ink-line);padding:clamp(1.5rem,3.5vw,2rem)}
.field{margin-bottom:1.05rem}
.field label{display:block;font-family:var(--f-display);font-weight:700;font-size:.6875rem;
  letter-spacing:.2em;text-transform:uppercase;color:var(--steel-up);margin-bottom:.45rem}
.field input,.field select,.field textarea{
  width:100%;background:var(--ink);border:1px solid var(--ink-line);border-radius:2px;
  padding:.8rem .9rem;color:var(--paper);font-family:var(--f-body);font-size:.96875rem}
.field input::placeholder,.field textarea::placeholder{color:#6E858F}
.field input:focus,.field select:focus,.field textarea:focus{border-color:var(--mint)}
.field textarea{resize:vertical;min-height:104px}
.field select{appearance:none;padding-right:2.4rem;background-repeat:no-repeat;
  background-position:right 1rem center;background-size:12px;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%239DB2BB' stroke-width='1.8' fill='none'/%3E%3C/svg%3E")}
.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
form.enquiry .btn{width:100%;margin-top:.35rem}
.form-note{font-size:.78125rem;color:var(--steel-up);margin-top:.85rem;text-align:center}
.form-msg{display:none;margin-top:.9rem;padding:.85rem;font-size:.9rem}
.form-msg.show{display:block}
.form-msg.ok{border:1px solid var(--mint);background:rgba(69,207,174,.1);color:var(--mint)}
.form-msg.err{border:1px solid #E8A29A;background:rgba(232,162,154,.12);color:#F0B5AE}

/* ---------------- CTA strip ---------------- */
.cta-strip{background:var(--ink);color:var(--mist);padding-block:clamp(3rem,6vw,4.25rem)}
.cta-strip h2{margin-bottom:.9rem;max-width:24ch}
.cta-strip p{max-width:58ch;color:var(--mist);margin-bottom:1.75rem}

/* ---------------- footer ---------------- */
footer.site{background:var(--ink);color:var(--steel-up);padding-block:3rem 1.75rem;border-top:1px solid var(--ink-line)}
.foot-top{display:flex;flex-wrap:wrap;gap:1.75rem;justify-content:space-between;align-items:flex-start;
  padding-bottom:2rem;border-bottom:1px solid var(--ink-line)}
.foot-tag{font-family:var(--f-display);font-weight:600;font-size:.875rem;color:var(--mint);margin-top:1rem}
.foot-nav{display:flex;flex-wrap:wrap;gap:1.4rem}
.foot-nav a{color:var(--steel-up);text-decoration:none;font-size:.875rem}
.foot-nav a:hover{color:var(--mint)}
.foot-bottom{display:flex;flex-wrap:wrap;gap:.6rem 1.5rem;justify-content:space-between;
  padding-top:1.4rem;font-size:.78125rem;color:var(--steel-up)}
.foot-bottom a{color:var(--steel-up);text-decoration:none}
.foot-bottom a:hover{color:var(--mint)}

/* ---------------- reveal + a11y ---------------- */
.rv{opacity:0;transform:translateY(16px);transition:opacity .55s ease,transform .55s cubic-bezier(.2,.7,.3,1)}
.rv.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.rv{opacity:1;transform:none;transition:none}}
.skip{position:absolute;left:-9999px;background:var(--ink);color:var(--mist);padding:.8rem 1.2rem;z-index:100;font-weight:700}
.skip:focus{left:0;top:0}
.sr{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* ---------------- error page ---------------- */
.err-page{display:flex;align-items:center;min-height:60vh;background:var(--ink);color:var(--mist)}
.err-page h1{color:var(--paper);margin:1rem 0}