/* ==========================================================================
   Clean Drains SG — design system
   Industrial B2B specialist: diagnose-first, compliance-led, not "a plumber".
   ========================================================================== */

:root{
  --ink:#132322;
  --ink-soft:#3c4b4a;
  --paper:#f6f7f6;
  --surface:#ffffff;
  --steel:#4c5f60;
  --steel-soft:#7c8c8c;
  --line:rgba(19,35,34,0.12);
  --line-strong:rgba(19,35,34,0.22);
  --brand:#0b6e8f;
  --brand-dark:#094f66;
  --brand-soft:#dcedf2;
  --alert:#b85c1a;
  --alert-soft:#f3e2d1;
  --ok:#2c6b52;
  --ok-soft:#d9e9df;
  --shadow-sm:0 1px 2px rgba(19,35,34,0.08);
  --shadow-md:0 6px 24px rgba(19,35,34,0.10);
  --radius:4px;
  --maxw:1180px;
}

@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --ink:#e9edec;
    --ink-soft:#c3cccb;
    --paper:#0e1615;
    --surface:#141f1e;
    --steel:#a7b6b6;
    --steel-soft:#6f8182;
    --line:rgba(233,237,236,0.12);
    --line-strong:rgba(233,237,236,0.22);
    --brand:#4fb3d6;
    --brand-dark:#8fd0e8;
    --brand-soft:#173038;
    --alert:#e08a4b;
    --alert-soft:#3a2a1a;
    --ok:#7fc4a8;
    --ok-soft:#183226;
    --shadow-sm:0 1px 2px rgba(0,0,0,0.4);
    --shadow-md:0 10px 30px rgba(0,0,0,0.5);
  }
}
:root[data-theme="dark"]{
  --ink:#e9edec; --ink-soft:#c3cccb; --paper:#0e1615; --surface:#141f1e;
  --steel:#a7b6b6; --steel-soft:#6f8182;
  --line:rgba(233,237,236,0.12); --line-strong:rgba(233,237,236,0.22);
  --brand:#4fb3d6; --brand-dark:#8fd0e8; --brand-soft:#173038;
  --alert:#e08a4b; --alert-soft:#3a2a1a; --ok:#7fc4a8; --ok-soft:#183226;
  --shadow-sm:0 1px 2px rgba(0,0,0,0.4); --shadow-md:0 10px 30px rgba(0,0,0,0.5);
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:"Inter","Helvetica Neue",Arial,sans-serif;
  font-size:16.5px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,.eyebrow,.btn,.nav a,.tag,th,.stat-num,.logo{
  font-family:"Archivo","Helvetica Neue",Arial,sans-serif;
}
code,.mono,.data{font-family:"JetBrains Mono",ui-monospace,Menlo,monospace;}

img,svg{max-width:100%;display:block;}
a{color:var(--brand);}
a:hover{color:var(--brand-dark);}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px;}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 1.5rem;}
.wrap-narrow{max-width:760px;margin:0 auto;padding:0 1.5rem;}

@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important;}}

/* ---------- Top utility bar ---------- */
.util-bar{
  background:var(--ink);
  color:var(--paper);
  font-size:0.78rem;
}
.util-bar .wrap{display:flex;justify-content:space-between;align-items:center;gap:1rem;padding-top:0.4rem;padding-bottom:0.4rem;flex-wrap:wrap;}
.util-bar a{color:var(--paper);text-decoration:none;}
.util-bar .util-links{display:flex;gap:1.2rem;}
.util-bar .util-links a:hover{color:var(--brand);}

/* ---------- Header ---------- */
header.site{
  position:sticky;top:0;z-index:40;
  background:var(--surface);
  border-bottom:1px solid var(--line);
}
.header-row{display:flex;align-items:center;justify-content:space-between;gap:1.5rem;padding:0.9rem 0;}
.logo{display:flex;align-items:center;gap:0.55rem;text-decoration:none;color:var(--ink);font-weight:800;font-size:1.15rem;letter-spacing:-0.01em;}
.logo .mark{width:30px;height:30px;flex:none;}
.logo .mark path{stroke:var(--brand);}
.nav{display:flex;align-items:center;gap:1.7rem;}
.nav a{color:var(--ink-soft);text-decoration:none;font-size:0.87rem;font-weight:600;}
.nav a:hover{color:var(--brand);}
.header-ctas{display:flex;align-items:center;gap:0.6rem;}
.nav-toggle{display:none;background:none;border:1px solid var(--line-strong);border-radius:var(--radius);padding:0.4rem 0.55rem;cursor:pointer;}
.nav-toggle span{display:block;width:18px;height:2px;background:var(--ink);margin:3px 0;}

@media(max-width:920px){
  .nav{position:fixed;inset:0 0 0 30%;background:var(--surface);flex-direction:column;align-items:flex-start;padding:5.5rem 1.5rem 2rem;gap:1.4rem;transform:translateX(100%);transition:transform 0.25s ease;border-left:1px solid var(--line-strong);overflow-y:auto;}
  .nav.open{transform:translateX(0);}
  .nav a{font-size:1.05rem;}
  .nav-toggle{display:block;}
  .header-ctas .btn-text-only{display:none;}
}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:0.5em;
  font-weight:700;font-size:0.88rem;letter-spacing:0.01em;
  padding:0.68em 1.15em;border-radius:var(--radius);
  border:1px solid transparent;cursor:pointer;text-decoration:none;
  white-space:nowrap;
}
.btn-primary{background:var(--brand);color:#fff;}
.btn-primary:hover{background:var(--brand-dark);color:#fff;}
.btn-secondary{background:var(--ok);color:#fff;}
.btn-secondary:hover{filter:brightness(1.08);color:#fff;}
.btn-outline{background:transparent;color:var(--ink);border-color:var(--line-strong);}
.btn-outline:hover{border-color:var(--brand);color:var(--brand);}
.btn-sm{padding:0.45em 0.85em;font-size:0.8rem;}
.btn-block{width:100%;}
.btn svg{width:1.05em;height:1.05em;flex:none;}

/* ---------- Sticky mobile CTA bar ---------- */
.mobile-cta-bar{
  display:none;position:fixed;bottom:0;left:0;right:0;z-index:50;
  background:var(--surface);border-top:1px solid var(--line-strong);
  padding:0.6rem 0.8rem;gap:0.5rem;box-shadow:0 -4px 16px rgba(0,0,0,0.08);
}
@media(max-width:720px){.mobile-cta-bar{display:flex;} body:has(.mobile-cta-bar){padding-bottom:4.2rem;}}
.mobile-cta-bar .btn{flex:1;padding:0.7em 0.4em;font-size:0.78rem;}

/* ---------- Hero ---------- */
.hero{padding:3.2rem 0 3rem;border-bottom:1px solid var(--line);}
.hero .wrap{display:grid;grid-template-columns:1.1fr 0.9fr;gap:3rem;align-items:center;}
@media(max-width:900px){.hero .wrap{grid-template-columns:1fr;gap:2rem;}}
.eyebrow{
  display:inline-flex;align-items:center;gap:0.5em;
  text-transform:uppercase;letter-spacing:0.1em;font-size:0.72rem;font-weight:700;
  color:var(--brand);margin:0 0 0.9rem;
}
.eyebrow::before{content:"";width:1.4em;height:2px;background:var(--brand);display:inline-block;}
h1{font-size:clamp(2rem,4.4vw,2.9rem);font-weight:800;line-height:1.08;letter-spacing:-0.015em;margin:0 0 1rem;text-wrap:balance;}
.lede{font-size:1.08rem;color:var(--ink-soft);max-width:52ch;margin:0 0 1.6rem;}
.hero-ctas{display:flex;flex-wrap:wrap;gap:0.8rem;}
.hero-trust{display:flex;flex-wrap:wrap;gap:1.4rem;margin-top:1.8rem;font-size:0.82rem;color:var(--steel-soft);}
.hero-trust span{display:flex;align-items:center;gap:0.45em;}
.hero-trust svg{width:1.05em;height:1.05em;color:var(--brand);flex:none;}

/* ---------- Sections ---------- */
section{padding:3.4rem 0;}
section.tight{padding:2.2rem 0;}
section.alt{background:var(--surface);border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
.section-head{max-width:62ch;margin-bottom:2.1rem;}
.section-head h2{margin:0 0 0.6rem;}
.section-head p{color:var(--ink-soft);margin:0;}
h2{font-size:1.7rem;font-weight:800;letter-spacing:-0.01em;text-wrap:balance;}
h3{font-size:1.08rem;font-weight:700;margin:0 0 0.5rem;}
p{margin:0 0 1rem;}
.small-print{font-size:0.82rem;color:var(--steel-soft);}

/* ---------- Service cards ---------- */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:1.3rem;}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:1.3rem;}
@media(max-width:900px){.grid-3{grid-template-columns:1fr 1fr;}}
@media(max-width:640px){.grid-3,.grid-2{grid-template-columns:1fr;}}

.card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:1.5rem 1.5rem 1.6rem;display:flex;flex-direction:column;
}
.card .icon{width:2.4rem;height:2.4rem;color:var(--brand);margin-bottom:0.9rem;}
.card h3{margin-bottom:0.5rem;}
.card p{color:var(--ink-soft);font-size:0.92rem;flex:1;margin-bottom:1rem;}
.card a.card-link{font-size:0.85rem;font-weight:700;color:var(--brand);text-decoration:none;}
.card a.card-link:hover{color:var(--brand-dark);}

/* ---------- Diagram frame ---------- */
.diagram-frame{
  background:var(--surface);border:1px solid var(--line-strong);border-radius:var(--radius);
  padding:1.4rem;box-shadow:var(--shadow-sm);
}
.diagram-caption{font-size:0.78rem;color:var(--steel-soft);text-align:center;margin-top:0.7rem;}

/* ---------- Tags / badges ---------- */
.tag{display:inline-flex;align-items:center;gap:0.35em;font-size:0.68rem;font-weight:700;text-transform:uppercase;letter-spacing:0.06em;padding:0.22em 0.6em;border-radius:3px;}
.tag-brand{background:var(--brand-soft);color:var(--brand-dark);}
.tag-alert{background:var(--alert-soft);color:var(--alert);}
.tag-ok{background:var(--ok-soft);color:var(--ok);}
.tag-neutral{background:rgba(76,95,96,0.12);color:var(--steel);}

/* ---------- Callouts ---------- */
.callout{border-left:3px solid var(--brand);background:var(--brand-soft);padding:1.1rem 1.3rem;border-radius:0 var(--radius) var(--radius) 0;margin:1.4rem 0;}
.callout.law{border-left-color:var(--alert);background:var(--alert-soft);}
.callout h4{margin:0 0 0.4rem;font-size:0.95rem;text-transform:uppercase;letter-spacing:0.04em;}
.callout p:last-child{margin-bottom:0;}

/* ---------- Tables ---------- */
.table-scroll{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);margin:1.3rem 0;}
table{border-collapse:collapse;width:100%;font-size:0.88rem;background:var(--surface);}
th,td{padding:0.65rem 0.9rem;text-align:left;border-bottom:1px solid var(--line);vertical-align:top;}
th{font-size:0.68rem;text-transform:uppercase;letter-spacing:0.06em;color:var(--steel);background:rgba(76,95,96,0.06);white-space:nowrap;}
tr:last-child td{border-bottom:none;}

/* ---------- Process steps ---------- */
.steps{counter-reset:step;display:grid;grid-template-columns:repeat(4,1fr);gap:1.2rem;}
@media(max-width:900px){.steps{grid-template-columns:1fr 1fr;}}
@media(max-width:560px){.steps{grid-template-columns:1fr;}}
.step{position:relative;padding-top:2.6rem;}
.step::before{counter-increment:step;content:counter(step);position:absolute;top:0;left:0;width:2rem;height:2rem;border-radius:50%;background:var(--brand);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:0.9rem;}
.step h4{margin:0 0 0.4rem;font-size:0.95rem;}
.step p{color:var(--ink-soft);font-size:0.87rem;margin:0;}

/* ---------- Segments strip ---------- */
.segment-strip{display:flex;flex-wrap:wrap;gap:0.6rem;}
.segment-pill{border:1px solid var(--line-strong);border-radius:20px;padding:0.4em 1em;font-size:0.82rem;color:var(--ink-soft);background:var(--surface);}

/* ---------- FAQ ---------- */
.faq-item{border-bottom:1px solid var(--line);padding:1.1rem 0;}
.faq-item summary{cursor:pointer;font-weight:700;list-style:none;display:flex;justify-content:space-between;gap:1rem;align-items:center;}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary::after{content:"+";font-size:1.3rem;color:var(--brand);font-weight:400;flex:none;}
.faq-item[open] summary::after{content:"–";}
.faq-item p{color:var(--ink-soft);margin:0.8rem 0 0;font-size:0.93rem;}

/* ---------- Lead-gen disclosure ---------- */
.disclosure{
  background:var(--surface);border:1px solid var(--line-strong);border-radius:var(--radius);
  padding:1.3rem 1.4rem;font-size:0.87rem;color:var(--ink-soft);
}
.disclosure strong{color:var(--ink);}

/* ---------- Quote / qualification form ---------- */
.quote-shell{background:var(--surface);border:1px solid var(--line-strong);border-radius:var(--radius);box-shadow:var(--shadow-md);overflow:hidden;}
.quote-progress{height:4px;background:var(--line);}
.quote-progress-fill{height:100%;background:var(--brand);width:9%;transition:width 0.25s ease;}
.quote-body{padding:1.8rem 1.8rem 1.6rem;}
.quote-step{display:none;}
.quote-step.active{display:block;animation:fade 0.2s ease;}
@keyframes fade{from{opacity:0;transform:translateY(4px);}to{opacity:1;transform:translateY(0);}}
.quote-step h3{font-size:1.15rem;margin-bottom:1.1rem;}
.q-options{display:grid;grid-template-columns:1fr 1fr;gap:0.7rem;margin-bottom:1.2rem;}
@media(max-width:520px){.q-options{grid-template-columns:1fr;}}
.q-option{border:1px solid var(--line-strong);border-radius:var(--radius);padding:0.85rem 1rem;cursor:pointer;font-size:0.9rem;font-weight:600;text-align:left;background:var(--surface);color:var(--ink);}
.q-option:hover{border-color:var(--brand);}
.q-option.selected{border-color:var(--brand);background:var(--brand-soft);color:var(--brand-dark);}
.q-field{margin-bottom:1.1rem;}
.q-field label{display:block;font-size:0.83rem;font-weight:700;margin-bottom:0.4rem;}
.q-field input[type="text"],.q-field input[type="tel"],.q-field input[type="date"],.q-field textarea,.q-field select{
  width:100%;padding:0.7em 0.85em;border:1px solid var(--line-strong);border-radius:var(--radius);font-family:inherit;font-size:0.95rem;background:var(--paper);color:var(--ink);
}
.q-field textarea{min-height:5rem;resize:vertical;}
.q-nav{display:flex;justify-content:space-between;align-items:center;margin-top:0.4rem;gap:0.8rem;}
.q-nav .step-count{font-size:0.78rem;color:var(--steel-soft);}
.q-upload{border:1px dashed var(--line-strong);border-radius:var(--radius);padding:1.3rem;text-align:center;cursor:pointer;font-size:0.87rem;color:var(--steel-soft);}
.q-upload input{display:none;}
.q-upload .file-list{margin-top:0.6rem;font-size:0.8rem;color:var(--ink-soft);}
.quote-summary{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:1.1rem 1.2rem;font-family:"JetBrains Mono",monospace;font-size:0.8rem;white-space:pre-line;margin-bottom:1.2rem;color:var(--ink-soft);}
.quote-done h3{margin-bottom:0.5rem;}

/* ---------- Footer ---------- */
footer.site{background:var(--ink);color:var(--paper);padding:3rem 0 1.6rem;margin-top:2rem;}
footer.site a{color:var(--paper);opacity:0.85;text-decoration:none;}
footer.site a:hover{opacity:1;color:var(--brand);}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:2rem;margin-bottom:2.2rem;}
@media(max-width:800px){.footer-grid{grid-template-columns:1fr 1fr;}}
@media(max-width:520px){.footer-grid{grid-template-columns:1fr;}}
.footer-grid h5{text-transform:uppercase;letter-spacing:0.08em;font-size:0.72rem;opacity:0.6;margin:0 0 0.9rem;}
.footer-grid ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:0.55rem;font-size:0.87rem;}
.footer-bottom{border-top:1px solid rgba(255,255,255,0.14);padding-top:1.4rem;display:flex;justify-content:space-between;flex-wrap:wrap;gap:0.8rem;font-size:0.78rem;opacity:0.65;}

/* ---------- Breadcrumbs ---------- */
.breadcrumbs{font-size:0.78rem;color:var(--steel-soft);padding:0.9rem 0;}
.breadcrumbs a{color:var(--steel-soft);text-decoration:none;}
.breadcrumbs a:hover{color:var(--brand);}

/* ---------- Stat row ---------- */
.stat-row{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;margin:1.6rem 0;}
@media(max-width:700px){.stat-row{grid-template-columns:1fr 1fr;}}
.stat{background:var(--surface);padding:1.1rem 1.2rem;}
.stat-num{font-size:1.4rem;font-weight:800;}
.stat-label{font-size:0.72rem;color:var(--steel-soft);text-transform:uppercase;letter-spacing:0.04em;margin-top:0.2rem;}

/* ---------- Page hero (inner pages) ---------- */
.page-hero{padding:2.4rem 0 2.6rem;border-bottom:1px solid var(--line);background:var(--surface);}
.page-hero h1{font-size:clamp(1.7rem,3.6vw,2.35rem);}
.page-hero .lede{margin-bottom:1.3rem;}

hr.rule{border:none;border-top:1px solid var(--line-strong);margin:2.4rem 0;}