/* ============================================================
   TSP Coatings — A Touchstone Painting Services Division
   Design system: premium black + muted gold, coating-stratum motif
   ============================================================ */

:root{
  --ink:#111315;
  --ink-2:#1a1d20;
  --ink-3:#24282c;
  --gold:#b08d4c;
  --gold-lo:#9a7a3d;
  --gold-hi:#c9a666;
  --grey:#6e6a63;
  --grey-lo:#8b877f;
  --paper:#f4f1ea;
  --paper-2:#ece7dc;
  --slate:#2e5a63;
  --slate-lo:#244a52;
  --white:#ffffff;
  --line:rgba(17,19,21,.12);
  --line-lo:rgba(255,255,255,.14);
  --shadow:0 1px 2px rgba(17,19,21,.06),0 8px 30px rgba(17,19,21,.08);
  --shadow-lg:0 24px 60px rgba(17,19,21,.18);
  --radius:4px;
  --radius-lg:8px;
  --wrap:1180px;
  --gutter:clamp(20px,5vw,56px);
  --ff-display:"Poppins",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  --ff-body:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation:none!important;transition:none!important}}

body{
  margin:0;font-family:var(--ff-body);color:var(--ink);background:var(--paper);
  font-size:17px;line-height:1.65;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{font-family:var(--ff-display);font-weight:600;line-height:1.1;margin:0 0 .5em;letter-spacing:-.01em}
h1{font-size:clamp(2.1rem,5.4vw,3.5rem);font-weight:700}
h2{font-size:clamp(1.6rem,3.4vw,2.4rem)}
h3{font-size:clamp(1.15rem,2vw,1.4rem)}
p{margin:0 0 1.05em}
strong{font-weight:600}
:focus-visible{outline:3px solid var(--gold);outline-offset:2px;border-radius:2px}
.wrap{max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gutter)}
.eyebrow{font-family:var(--ff-display);font-weight:600;font-size:.72rem;letter-spacing:.22em;text-transform:uppercase;color:var(--gold);margin:0 0 .9rem}
.eyebrow.on-dark{color:var(--gold-hi)}
.lede{font-size:clamp(1.05rem,1.7vw,1.28rem);color:var(--grey);line-height:1.6;max-width:60ch}

/* ---- coating-stratum divider (signature motif) ---- */
.stratum{height:9px;width:100%;display:block;
  background:
    linear-gradient(var(--gold),var(--gold)) 0 0/100% 2px no-repeat,
    linear-gradient(var(--slate),var(--slate)) 0 4px/100% 1px no-repeat,
    linear-gradient(var(--ink),var(--ink)) 0 7px/100% 2px no-repeat;
  opacity:.9}
.stratum.on-dark{
  background:
    linear-gradient(var(--gold-hi),var(--gold-hi)) 0 0/100% 2px no-repeat,
    linear-gradient(rgba(255,255,255,.4),rgba(255,255,255,.4)) 0 4px/100% 1px no-repeat,
    linear-gradient(var(--gold),var(--gold)) 0 7px/100% 2px no-repeat}

/* ---- buttons ---- */
.btn{display:inline-flex;align-items:center;gap:.55rem;font-family:var(--ff-display);font-weight:600;
  font-size:.94rem;letter-spacing:.01em;padding:.85rem 1.4rem;border-radius:var(--radius);
  border:1.5px solid transparent;cursor:pointer;transition:transform .15s ease,background .2s ease,color .2s ease,border-color .2s ease;line-height:1}
.btn:hover{transform:translateY(-2px)}
.btn-gold{background:var(--gold);color:var(--ink)}
.btn-gold:hover{background:var(--gold-hi)}
.btn-ink{background:var(--ink);color:var(--paper)}
.btn-ink:hover{background:var(--ink-3)}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{border-color:var(--ink)}
.btn-ghost.on-dark{color:var(--paper);border-color:var(--line-lo)}
.btn-ghost.on-dark:hover{border-color:var(--gold-hi);color:var(--gold-hi)}
.btn .arw{font-size:1.05em;transform:translateY(.5px)}

/* ---- header ---- */
.site-head{position:sticky;top:0;z-index:60;background:rgba(17,19,21,.96);backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line-lo)}
.site-head .bar{display:flex;align-items:center;justify-content:space-between;gap:1.5rem;min-height:70px}
.brand{display:flex;align-items:center;gap:.7rem;color:var(--paper)}
.brand .mono{width:38px;height:38px;flex:0 0 auto}
.brand .brand-lion{width:auto;height:40px;flex:0 0 auto;display:block}
.brand .txt{display:flex;flex-direction:column;line-height:1}
.brand .txt b{font-family:var(--ff-display);font-weight:700;font-size:1.12rem;letter-spacing:.02em;color:var(--white)}
.brand .txt span{font-size:.62rem;letter-spacing:.14em;text-transform:uppercase;color:var(--gold-hi);margin-top:3px}
.nav{display:flex;align-items:center;gap:1.35rem}
.nav a{color:var(--paper);font-size:.9rem;font-weight:500;opacity:.85;transition:opacity .2s,color .2s}
.nav a:hover,.nav a.active{opacity:1;color:var(--gold-hi)}
.nav .btn{padding:.6rem 1.05rem;font-size:.86rem}
.nav-toggle{display:none;background:none;border:0;color:var(--paper);cursor:pointer;padding:.4rem}
.nav-toggle svg{width:26px;height:26px}
@media (max-width:960px){
  .nav{position:fixed;inset:70px 0 auto 0;flex-direction:column;align-items:stretch;gap:0;
    background:var(--ink);border-bottom:1px solid var(--line-lo);padding:.5rem var(--gutter) 1.2rem;
    transform:translateY(-120%);transition:transform .28s ease;max-height:calc(100vh - 70px);overflow:auto}
  .nav.open{transform:translateY(0)}
  .nav a{padding:.85rem 0;border-bottom:1px solid var(--line-lo);opacity:.95}
  .nav .btn{margin-top:.9rem;justify-content:center}
  .nav-toggle{display:block}
}

/* ---- hero ---- */
.hero{background:var(--ink);color:var(--paper);position:relative;overflow:hidden}
.hero::after{content:"";position:absolute;right:-10%;top:-20%;width:60%;height:140%;
  background:radial-gradient(closest-side,rgba(176,141,76,.16),transparent 70%);pointer-events:none}
.hero .wrap{position:relative;padding-block:clamp(3.4rem,8vw,6rem)}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:clamp(2rem,5vw,4rem);align-items:center}
.hero h1{color:var(--white);max-width:16ch}
.hero .lede{color:#cfcabf;max-width:52ch}
.hero-cta{display:flex;flex-wrap:wrap;gap:.8rem;margin-top:1.9rem}
.hero-aside{border:1px solid var(--line-lo);border-radius:var(--radius-lg);padding:1.6rem;background:linear-gradient(180deg,rgba(255,255,255,.03),transparent)}
.pillars{display:grid;gap:1rem}
.pillar{display:flex;gap:.9rem;align-items:flex-start}
.pillar .pn{font-family:var(--ff-display);font-weight:700;color:var(--gold-hi);font-size:.8rem;letter-spacing:.14em;
  border:1px solid var(--gold);border-radius:3px;padding:.2rem .5rem;flex:0 0 auto;margin-top:.15rem}
.pillar b{color:var(--white);font-family:var(--ff-display);display:block;font-size:1.02rem}
.pillar span{color:#bdb8ad;font-size:.9rem}
@media (max-width:860px){.hero-grid{grid-template-columns:1fr}.hero-aside{order:2}}

/* ---- trust strip ---- */
.trust{background:var(--ink-2);color:#cbc6bb;border-top:1px solid var(--line-lo);border-bottom:1px solid var(--line-lo)}
.trust .wrap{display:flex;flex-wrap:wrap;gap:.6rem 2rem;justify-content:center;padding-block:.95rem;font-size:.82rem;letter-spacing:.02em}
.trust b{color:var(--gold-hi);font-weight:600}
.trust .dot{color:var(--gold);opacity:.6}

/* ---- sections ---- */
section{padding-block:clamp(3rem,6.5vw,5.2rem)}
.sec-paper{background:var(--paper)}
.sec-paper-2{background:var(--paper-2)}
.sec-ink{background:var(--ink);color:var(--paper)}
.sec-ink h2,.sec-ink h3{color:var(--white)}
.sec-slate{background:var(--slate);color:#eef3f2}
.sec-slate h2,.sec-slate h3{color:var(--white)}
.sec-head{max-width:64ch;margin-bottom:2.4rem}
.sec-head.center{margin-inline:auto;text-align:center}
.sec-ink .lede,.sec-slate .lede{color:#d5d0c6}
.sec-slate .lede{color:#cfe0dd}

/* ---- cards ---- */
.grid{display:grid;gap:1.2rem}
.g-2{grid-template-columns:repeat(2,1fr)}
.g-3{grid-template-columns:repeat(3,1fr)}
.g-4{grid-template-columns:repeat(4,1fr)}
@media (max-width:900px){.g-3,.g-4{grid-template-columns:repeat(2,1fr)}}
@media (max-width:620px){.g-2,.g-3,.g-4{grid-template-columns:1fr}}
.card{background:var(--white);border:1px solid var(--line);border-radius:var(--radius-lg);padding:1.5rem;
  box-shadow:var(--shadow);transition:transform .18s ease,box-shadow .18s ease;position:relative}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg)}
.card .kn{font-family:var(--ff-display);font-weight:700;color:var(--gold);font-size:.78rem;letter-spacing:.16em;text-transform:uppercase}
.card h3{margin-top:.5rem}
.card p{color:var(--grey);font-size:.96rem;margin-bottom:.6rem}
.card .more{font-family:var(--ff-display);font-weight:600;font-size:.86rem;color:var(--ink);display:inline-flex;gap:.35rem;align-items:center}
.card .more .arw{color:var(--gold);transition:transform .15s ease}
.card:hover .more .arw{transform:translateX(3px)}
.card.on-dark{background:var(--ink-2);border-color:var(--line-lo);color:#cbc6bb}
.card.on-dark h3{color:var(--white)}.card.on-dark p{color:#b4afa5}

/* ---- list marks ---- */
.ticks{list-style:none;padding:0;margin:0;display:grid;gap:.6rem}
.ticks li{position:relative;padding-left:1.7rem;color:var(--grey)}
.ticks li::before{content:"";position:absolute;left:0;top:.55em;width:11px;height:11px;
  background:linear-gradient(var(--gold),var(--gold)) 0 0/100% 3px no-repeat,
            linear-gradient(var(--ink),var(--ink)) 0 5px/100% 3px no-repeat}
.sec-ink .ticks li,.sec-slate .ticks li{color:#cfcabf}

/* ---- split feature ---- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:clamp(2rem,5vw,4rem);align-items:center}
.split.rev>div:first-child{order:2}
@media (max-width:820px){.split{grid-template-columns:1fr}.split.rev>div:first-child{order:0}}
.figure{border-radius:var(--radius-lg);overflow:hidden;border:1px solid var(--line);background:var(--ink);
  aspect-ratio:4/3;position:relative;box-shadow:var(--shadow)}
.figure .imgnote{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;text-align:center;
  color:#7d786f;font-size:.82rem;padding:1.5rem;background:
   repeating-linear-gradient(45deg,rgba(255,255,255,.02) 0 12px,transparent 12px 24px),var(--ink-2)}
.figure .chip{position:absolute;left:.9rem;top:.9rem;background:var(--gold);color:var(--ink);
  font-family:var(--ff-display);font-weight:700;font-size:.68rem;letter-spacing:.12em;text-transform:uppercase;padding:.28rem .6rem;border-radius:3px}

/* ---- table ---- */
.tbl{width:100%;border-collapse:collapse;font-size:.94rem;background:var(--white);border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow)}
.tbl th,.tbl td{text-align:left;padding:.85rem 1rem;border-bottom:1px solid var(--line);vertical-align:top}
.tbl th{background:var(--ink);color:var(--paper);font-family:var(--ff-display);font-weight:600;font-size:.82rem;letter-spacing:.05em}
.tbl tr:last-child td{border-bottom:0}
.tbl td:first-child{font-weight:600;color:var(--ink)}
.tbl-wrap{overflow-x:auto}

/* ---- FAQ ---- */
.faq{border:1px solid var(--line);border-radius:var(--radius);background:var(--white);margin-bottom:.7rem;overflow:hidden}
.faq summary{cursor:pointer;padding:1.05rem 1.2rem;font-family:var(--ff-display);font-weight:600;font-size:1rem;
  list-style:none;display:flex;justify-content:space-between;gap:1rem;align-items:center}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--gold);font-size:1.35rem;font-weight:600;line-height:1;transition:transform .2s}
.faq[open] summary::after{transform:rotate(45deg)}
.faq .a{padding:0 1.2rem 1.15rem;color:var(--grey);font-size:.96rem}

/* ---- CTA band ---- */
.cta-band{background:var(--ink);color:var(--paper);text-align:center}
.cta-band h2{color:var(--white);max-width:22ch;margin-inline:auto}
.cta-band p{color:#cbc6bb;max-width:56ch;margin-inline:auto}
.cta-band .row{display:flex;gap:.8rem;justify-content:center;flex-wrap:wrap;margin-top:1.6rem}

/* ---- forms / calculators ---- */
.field{display:flex;flex-direction:column;gap:.35rem;margin-bottom:1rem}
.field label{font-family:var(--ff-display);font-weight:600;font-size:.86rem;color:var(--ink)}
.field .hint{font-size:.76rem;color:var(--grey-lo);font-weight:400;font-family:var(--ff-body)}
.field input,.field select,.field textarea{font-family:var(--ff-body);font-size:1rem;padding:.7rem .8rem;
  border:1.5px solid var(--line);border-radius:var(--radius);background:var(--white);color:var(--ink);width:100%}
.field input:focus,.field select:focus,.field textarea:focus{border-color:var(--gold);outline:none}
.sec-ink .field label,.sec-slate .field label{color:var(--white)}
.sec-ink .field .hint,.sec-slate .field .hint{color:#a9a49a}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:0 1.2rem}
@media (max-width:620px){.form-grid{grid-template-columns:1fr}}

.calc{background:var(--white);border:1px solid var(--line);border-radius:var(--radius-lg);box-shadow:var(--shadow);overflow:hidden}
.calc-tabs{display:flex;flex-wrap:wrap;gap:2px;background:var(--paper-2);padding:6px;border-bottom:1px solid var(--line)}
.calc-tab{flex:1 1 auto;font-family:var(--ff-display);font-weight:600;font-size:.84rem;padding:.7rem .8rem;text-align:center;
  border:0;background:transparent;color:var(--grey);border-radius:var(--radius);cursor:pointer;transition:.15s;white-space:nowrap}
.calc-tab.active{background:var(--ink);color:var(--paper)}
.calc-body{padding:clamp(1.3rem,3vw,2rem)}
.calc-panel{display:none}.calc-panel.active{display:block}
.calc-cols{display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(1.4rem,3vw,2.4rem)}
@media (max-width:780px){.calc-cols{grid-template-columns:1fr}}
.readout{background:var(--ink);color:var(--paper);border-radius:var(--radius-lg);padding:1.5rem;align-self:start;position:sticky;top:90px}
.readout .rlabel{font-family:var(--ff-display);font-size:.72rem;letter-spacing:.16em;text-transform:uppercase;color:var(--gold-hi)}
.readout .rbig{font-family:var(--ff-display);font-weight:700;color:var(--white);font-size:clamp(1.9rem,4.5vw,2.7rem);line-height:1.05;margin:.35rem 0 .1rem}
.readout .rsub{color:#bdb8ad;font-size:.9rem}
.readout .rrow{display:flex;justify-content:space-between;gap:1rem;padding:.5rem 0;border-top:1px solid var(--line-lo);font-size:.9rem;color:#cbc6bb}
.readout .rrow b{color:var(--white);font-family:var(--ff-display)}
.readout .rrow:first-of-type{margin-top:1.1rem}
.assump{margin-top:1rem;border-top:1px solid var(--line);padding-top:1rem}
.assump summary{cursor:pointer;font-family:var(--ff-display);font-weight:600;font-size:.82rem;color:var(--slate)}
.disclaimer{font-size:.8rem;color:var(--grey-lo);border-left:3px solid var(--gold);padding:.6rem .9rem;background:var(--paper);border-radius:0 var(--radius) var(--radius) 0;margin-top:1rem;line-height:1.55}
.range-out{display:flex;align-items:baseline;gap:.5rem;flex-wrap:wrap}

/* ---- misc ---- */
.crumb{font-size:.8rem;color:var(--grey-lo);padding-top:1.4rem}
.crumb a:hover{color:var(--gold-lo)}
.pagehead{background:var(--ink);color:var(--paper)}
.pagehead .wrap{padding-block:clamp(2.6rem,6vw,4rem)}
.pagehead h1{color:var(--white);max-width:20ch}
.pagehead .lede{color:#cfcabf}
.prose h2{margin-top:2.2rem}.prose h3{margin-top:1.6rem}
.prose ul{padding-left:0;list-style:none}
.prose>ul>li{position:relative;padding-left:1.6rem;margin-bottom:.5rem;color:var(--grey)}
.prose>ul>li::before{content:"";position:absolute;left:0;top:.55em;width:10px;height:3px;background:var(--gold)}
.mini{font-size:.82rem;color:var(--grey-lo)}
.pill{display:inline-block;background:var(--paper-2);border:1px solid var(--line);border-radius:100px;
  padding:.3rem .8rem;font-size:.82rem;font-weight:500;color:var(--ink);margin:.2rem .3rem .2rem 0}

/* ---- footer ---- */
.site-foot{background:var(--ink);color:#a9a49a;padding-block:3rem 2rem;border-top:3px solid var(--gold)}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:2rem}
@media (max-width:820px){.foot-grid{grid-template-columns:1fr 1fr}}
@media (max-width:520px){.foot-grid{grid-template-columns:1fr}}
.site-foot h4{color:var(--white);font-size:.8rem;letter-spacing:.14em;text-transform:uppercase;margin-bottom:1rem}
.site-foot a{color:#a9a49a;font-size:.92rem;display:block;padding:.22rem 0;transition:color .15s}
.site-foot a:hover{color:var(--gold-hi)}
.site-foot .fbrand b{color:var(--white);font-family:var(--ff-display);font-size:1.2rem;display:block}
.site-foot .fbrand span{color:var(--gold-hi);font-size:.66rem;letter-spacing:.14em;text-transform:uppercase}
.site-foot .fbrand p{color:#8b877f;font-size:.9rem;margin-top:.8rem;max-width:34ch}
.foot-base{border-top:1px solid var(--line-lo);margin-top:2.4rem;padding-top:1.4rem;display:flex;
  flex-wrap:wrap;gap:.6rem 1.4rem;justify-content:space-between;font-size:.8rem;color:#7d786f}
.foot-base a{display:inline}
.foot-note{font-size:.78rem;color:#6e6a63;font-style:italic;margin-top:.5rem}