/* ==========================================================================
   HDPEGeomembraneSupplier.com — stylesheet
   Identity: liner black + spec-sheet paper + hi-vis site yellow.
   Signature device: the "weld rule" — two parallel lines with an air channel
   between them, taken from a dual-track wedge weld seam.
   ========================================================================== */

:root {
  --ink: #0E1216;
  --graphite: #39434B;
  --steel: #6C7780;
  --paper: #F4F5F2;
  --paper-2: #E7E9E3;
  --paper-3: #DCDFD7;
  --seam: #0F4C5C;
  --seam-dark: #0A3945;
  --hivis: #F5C518;
  --line: rgba(14, 18, 22, .14);
  --line-strong: rgba(14, 18, 22, .3);

  --display: "Barlow Condensed", "Arial Narrow", sans-serif;
  --body: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;

  --wrap: 1180px;
  --gap: clamp(1.25rem, 3vw, 2.5rem);
  --radius: 2px;
}

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--body);
  font-size: 17px;
  line-height: 1.68;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--seam); text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { color: var(--seam-dark); text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--hivis); outline-offset: 2px; }

/* ---------- type ---------- */
h1, h2, h3, h4 {
  font-family: var(--display);
  font-weight: 600;
  line-height: 1.06;
  letter-spacing: .005em;
  margin: 0 0 .5em;
  text-wrap: balance;
}
h1 { font-size: clamp(2.3rem, 6vw, 3.9rem); text-transform: uppercase; letter-spacing: .01em; }
h2 { font-size: clamp(1.75rem, 3.6vw, 2.5rem); text-transform: uppercase; }
h3 { font-size: clamp(1.28rem, 2.1vw, 1.55rem); }
h4 { font-size: 1.13rem; letter-spacing: .02em; text-transform: uppercase; color: var(--graphite); }
p { margin: 0 0 1.1em; }
ul, ol { margin: 0 0 1.2em; padding-left: 1.15rem; }
li { margin-bottom: .45em; }
strong { font-weight: 600; }
.lead { font-size: clamp(1.06rem, 1.7vw, 1.22rem); color: var(--graphite); }

.eyebrow {
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--seam);
  margin: 0 0 .9rem;
  display: block;
}

/* ---------- signature: weld rule ---------- */
.weld { border: 0; height: 8px; margin: 0 0 1.4rem; width: 74px; position: relative; }
.weld::before, .weld::after {
  content: ""; position: absolute; left: 0; right: 0; height: 2px; background: var(--ink);
}
.weld::before { top: 0; }
.weld::after { bottom: 0; }
.weld.light::before, .weld.light::after { background: var(--hivis); }
.weld.full { width: 100%; }

/* ---------- layout ---------- */
.wrap { width: min(100% - 2.5rem, var(--wrap)); margin-inline: auto; }
section { padding-block: clamp(2.6rem, 6vw, 4.6rem); }
.section-tight { padding-block: clamp(1.8rem, 4vw, 3rem); }
.grid { display: grid; gap: var(--gap); }
@media (min-width: 760px) {
  .g-2 { grid-template-columns: repeat(2, 1fr); }
  .g-3 { grid-template-columns: repeat(3, 1fr); }
  .g-4 { grid-template-columns: repeat(2, 1fr); }
  .split { grid-template-columns: 1.55fr 1fr; align-items: start; }
}
@media (min-width: 1040px) { .g-4 { grid-template-columns: repeat(4, 1fr); } }

/* ---------- header ---------- */
.topbar {
  background: var(--ink); color: var(--paper-3);
  font-family: var(--mono); font-size: .74rem; letter-spacing: .06em;
}
.topbar .wrap { display: flex; flex-wrap: wrap; gap: .4rem 1.5rem; justify-content: space-between; padding-block: .5rem; }
.topbar span { text-transform: uppercase; }
.topbar b { color: var(--hivis); font-weight: 500; }

.site-header { position: sticky; top: 0; z-index: 50; background: var(--paper); border-bottom: 1px solid var(--line); }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding-block: .85rem; }
.brand { display: flex; align-items: center; gap: .65rem; text-decoration: none; color: var(--ink); }
.brand img { width: 40px; height: 40px; }
.brand-mark {
  width: 40px; height: 40px; flex: none; background: var(--ink); color: var(--hivis);
  display: grid; place-items: center; font-family: var(--display); font-size: 1.35rem; font-weight: 700;
}
.brand-txt { font-family: var(--display); text-transform: uppercase; line-height: 1; }
.brand-txt b { display: block; font-size: 1.42rem; font-weight: 700; letter-spacing: .01em; }
.brand-txt span { font-family: var(--mono); font-size: .6rem; letter-spacing: .13em; color: var(--steel); text-transform: uppercase; }

.nav-toggle {
  display: inline-flex; align-items: center; gap: .5rem; background: var(--ink); color: var(--paper);
  border: 0; padding: .6rem .85rem; font-family: var(--mono); font-size: .78rem; letter-spacing: .1em;
  text-transform: uppercase; cursor: pointer;
}
nav.main { display: none; }
nav.main ul { list-style: none; margin: 0; padding: 0; }
nav.main > ul { display: flex; flex-direction: column; gap: .1rem; }
nav.main a {
  display: block; padding: .6rem .2rem; text-decoration: none; color: var(--ink);
  font-family: var(--display); font-size: 1.12rem; text-transform: uppercase; letter-spacing: .02em;
  border-bottom: 1px solid var(--line);
}
nav.main a:hover, nav.main a[aria-current="page"] { color: var(--seam); }
nav.main .sub { padding-left: .9rem; }
nav.main .sub a { font-family: var(--body); font-size: .92rem; text-transform: none; letter-spacing: 0; color: var(--graphite); border: 0; padding: .3rem .2rem; }
nav.main.open { display: block; padding-bottom: 1.2rem; }
.nav-cta { display: none; }

@media (min-width: 1000px) {
  .nav-toggle { display: none; }
  nav.main { display: block !important; }
  nav.main > ul { flex-direction: row; align-items: center; gap: 1.4rem; }
  nav.main > ul > li { position: relative; }
  nav.main a { border: 0; padding: .35rem 0; font-size: 1.02rem; }
  nav.main .sub {
    position: absolute; top: 100%; left: -1rem; min-width: 268px; background: var(--ink);
    padding: .6rem 0; display: none; box-shadow: 0 18px 40px rgba(14,18,22,.22);
  }
  nav.main li:hover > .sub, nav.main li:focus-within > .sub { display: block; }
  nav.main .sub a { color: var(--paper-3); padding: .5rem 1.1rem; }
  nav.main .sub a:hover { color: var(--hivis); background: rgba(255,255,255,.05); }
  .nav-cta { display: inline-flex; }
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: .55rem; text-decoration: none;
  font-family: var(--display); font-size: 1.08rem; font-weight: 600; text-transform: uppercase;
  letter-spacing: .05em; padding: .72rem 1.3rem; border: 2px solid var(--ink);
  background: var(--hivis); color: var(--ink); cursor: pointer; transition: transform .12s ease, background .12s ease;
}
.btn:hover { background: var(--ink); color: var(--hivis); transform: translateY(-1px); text-decoration: none; }
.btn.ghost { background: transparent; color: var(--ink); }
.btn.ghost:hover { background: var(--ink); color: var(--paper); }
.btn.on-dark { border-color: var(--hivis); }
.btn.on-dark.ghost { color: var(--paper); border-color: rgba(255,255,255,.45); }
.btn.on-dark.ghost:hover { background: var(--hivis); color: var(--ink); border-color: var(--hivis); }

/* ---------- hero ---------- */
.hero { background: var(--ink); color: var(--paper); padding-block: clamp(2.8rem, 7vw, 5rem); position: relative; overflow: hidden; }
.hero::after {
  content: ""; position: absolute; inset: auto 0 0 0; height: 10px;
  background: repeating-linear-gradient(90deg, var(--hivis) 0 26px, transparent 26px 52px);
  opacity: .85;
}
.hero h1 { color: var(--paper); }
.hero .eyebrow { color: var(--hivis); }
.hero p { color: #C9CEC9; }
.hero .lead { color: #D8DCD6; }
.hero-actions { display: flex; flex-wrap: wrap; gap: .8rem; margin-top: 1.6rem; }
.hero-figure {
  margin: 2.2rem 0 0; border: 1px solid rgba(255,255,255,.18); position: relative;
  background: #0A0D10;
}
.hero-figure img { width: 100%; height: auto; display: block; }
.hero-figure::after {
  content: ""; position: absolute; left: 0; bottom: 0; width: 96px; height: 6px; background: var(--hivis);
}
.hero .spec-rail + .hero-figure { margin-top: 2rem; }

/* the spec rail — reads like the label printed on a liner roll */
.spec-rail {
  margin-top: 2.4rem; border-top: 1px solid rgba(255,255,255,.2); border-bottom: 1px solid rgba(255,255,255,.2);
  display: grid; grid-template-columns: repeat(2, 1fr); font-family: var(--mono);
}
@media (min-width: 860px) { .spec-rail { grid-template-columns: repeat(4, 1fr); } }
.spec-rail div { padding: .95rem 1rem .95rem 0; border-right: 1px solid rgba(255,255,255,.12); }
.spec-rail div:last-child { border-right: 0; }
.spec-rail dt, .spec-rail b { display: block; font-size: .66rem; letter-spacing: .14em; text-transform: uppercase; color: #8E9A96; font-weight: 400; }
.spec-rail dd, .spec-rail span { margin: .25rem 0 0; display: block; font-size: 1.02rem; color: var(--hivis); }

/* ---------- panels & cards ---------- */
.panel { background: #fff; border: 1px solid var(--line); padding: clamp(1.2rem, 2.4vw, 1.9rem); }
.panel.dark { background: var(--ink); color: var(--paper-3); border-color: var(--ink); }
.panel.dark h2, .panel.dark h3 { color: var(--paper); }
.panel.tint { background: var(--paper-2); }

.card { background: #fff; border: 1px solid var(--line); padding: 1.4rem; display: flex; flex-direction: column; }
.card h3 { margin-bottom: .35rem; }
.card p { color: var(--graphite); font-size: .96rem; }
.card .card-link { margin-top: auto; font-family: var(--display); text-transform: uppercase; font-size: 1rem; letter-spacing: .04em; text-decoration: none; }
.card .card-link::after { content: " →"; }
.card:hover { border-color: var(--line-strong); }
.card .num { font-family: var(--mono); font-size: .7rem; letter-spacing: .14em; color: var(--steel); display: block; margin-bottom: .6rem; }

/* ---------- tables ---------- */
.table-scroll { overflow-x: auto; margin-bottom: 1.4rem; border: 1px solid var(--line); background: #fff; }
table { border-collapse: collapse; width: 100%; font-size: .93rem; }
caption { text-align: left; font-family: var(--mono); font-size: .72rem; letter-spacing: .1em; text-transform: uppercase; color: var(--steel); padding: .8rem 1rem; }
th, td { padding: .68rem .9rem; text-align: left; border-bottom: 1px solid var(--line); vertical-align: top; }
thead th { background: var(--ink); color: var(--paper); font-family: var(--mono); font-size: .72rem; letter-spacing: .09em; text-transform: uppercase; font-weight: 500; }
tbody tr:nth-child(even) { background: var(--paper); }
td.num, th.num { font-family: var(--mono); white-space: nowrap; }

/* ---------- breadcrumbs ---------- */
.crumbs { font-family: var(--mono); font-size: .74rem; letter-spacing: .06em; padding-block: .85rem; border-bottom: 1px solid var(--line); }
.crumbs ol { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: .45rem; }
.crumbs li::after { content: "/"; margin-left: .45rem; color: var(--steel); }
.crumbs li:last-child::after { content: ""; }
.crumbs a { text-decoration: none; }
.crumbs [aria-current] { color: var(--steel); }

/* ---------- FAQ ---------- */
.faq details { border-bottom: 1px solid var(--line); padding: .3rem 0; background: none; }
.faq summary {
  cursor: pointer; list-style: none; padding: .95rem 2.2rem .95rem 0; position: relative;
  font-family: var(--display); font-size: clamp(1.14rem, 2vw, 1.36rem); text-transform: none; letter-spacing: .01em;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+"; position: absolute; right: .2rem; top: .75rem; font-family: var(--mono);
  font-size: 1.4rem; color: var(--seam); line-height: 1;
}
.faq details[open] summary::after { content: "–"; }
.faq details p { color: var(--graphite); margin-bottom: 1rem; max-width: 74ch; }

/* ---------- forms ---------- */
.form-grid { display: grid; gap: 1rem; }
@media (min-width: 700px) { .form-grid .half { grid-column: span 1; } .form-grid { grid-template-columns: 1fr 1fr; } .form-grid .full { grid-column: 1 / -1; } }
label { display: block; font-family: var(--mono); font-size: .72rem; letter-spacing: .1em; text-transform: uppercase; margin-bottom: .35rem; color: var(--graphite); }
input, select, textarea {
  width: 100%; font-family: var(--body); font-size: 1rem; padding: .72rem .8rem;
  border: 1px solid var(--line-strong); background: #fff; color: var(--ink); border-radius: var(--radius);
}
textarea { min-height: 128px; resize: vertical; }
input:focus, select:focus, textarea:focus { border-color: var(--seam); outline: 2px solid rgba(15,76,92,.25); outline-offset: 0; }
.panel.dark label { color: #A9B3AE; }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.form-note { font-size: .82rem; color: var(--steel); }
.panel.dark .form-note { color: #8E9A96; }

/* ---------- callout / quote-strip ---------- */
.callout { border-left: 4px solid var(--hivis); background: #fff; padding: 1.1rem 1.3rem; margin: 0 0 1.5rem; }
.callout p:last-child { margin-bottom: 0; }
.callout .k { font-family: var(--mono); font-size: .72rem; letter-spacing: .12em; text-transform: uppercase; color: var(--seam); display: block; margin-bottom: .35rem; }

/* ---------- link cluster ---------- */
.linkset { list-style: none; padding: 0; margin: 0; display: grid; gap: .55rem; }
.linkset li { border-bottom: 1px dotted var(--line-strong); padding-bottom: .55rem; }
.linkset a { font-family: var(--display); font-size: 1.12rem; text-transform: uppercase; letter-spacing: .02em; text-decoration: none; }
.linkset a::before { content: "→ "; color: var(--hivis); }
.linkset span { display: block; font-size: .87rem; color: var(--steel); font-family: var(--body); text-transform: none; letter-spacing: 0; }

/* ---------- article ---------- */
.article { max-width: 74ch; }
.article h2 { margin-top: 2.2rem; }
.article h3 { margin-top: 1.6rem; }
.article img { border: 1px solid var(--line); width: 100%; height: auto; }
.article-figure { margin: 0 0 2rem; }
.article-figure img { display: block; }
.article-figure figcaption {
  font-size: .86rem; color: var(--steel); padding: .7rem 0 0; line-height: 1.5;
  border-bottom: 1px solid var(--line); padding-bottom: .8rem;
}
.meta { font-family: var(--mono); font-size: .74rem; letter-spacing: .08em; text-transform: uppercase; color: var(--steel); margin-bottom: 1.2rem; }
.toc { background: var(--paper-2); border-left: 3px solid var(--ink); padding: 1.1rem 1.3rem; margin-bottom: 2rem; }
.toc h2 { font-size: 1.05rem; margin: 0 0 .5rem; letter-spacing: .1em; font-family: var(--mono); text-transform: uppercase; }
.toc ul { margin: 0; padding-left: 1.1rem; }
.toc li { margin-bottom: .3rem; font-size: .95rem; }

.postlist { list-style: none; padding: 0; margin: 0; display: grid; gap: 1.1rem; }
.postlist li { border-top: 1px solid var(--line); padding-top: 1.1rem; }
.postlist h3 { margin-bottom: .25rem; }
.postlist a { text-decoration: none; }
.postlist p { color: var(--graphite); font-size: .95rem; margin: 0; }

/* ---------- CTA band ---------- */
.cta-band { background: var(--seam); color: #fff; }
.cta-band h2 { color: #fff; }
.cta-band p { color: #CFE0E4; }
.cta-band a.btn { background: var(--hivis); border-color: var(--hivis); color: var(--ink); }
.cta-band a.btn:hover { background: #fff; border-color: #fff; }

/* ---------- footer ---------- */
.site-footer { background: var(--ink); color: #A9B3AE; padding-block: 3rem 1.5rem; font-size: .93rem; }
.site-footer h4 { color: var(--paper); font-family: var(--mono); font-size: .72rem; letter-spacing: .14em; margin-bottom: .9rem; }
.site-footer a { color: #C9CEC9; text-decoration: none; }
.site-footer a:hover { color: var(--hivis); }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin-bottom: .45rem; }
.footer-cols { display: grid; gap: 2rem; }
@media (min-width: 720px) { .footer-cols { grid-template-columns: 1.4fr 1fr 1fr 1fr; } }
.footer-bottom {
  margin-top: 2.4rem; padding-top: 1.2rem; border-top: 1px solid rgba(255,255,255,.14);
  display: flex; flex-wrap: wrap; gap: .6rem 1.5rem; justify-content: space-between;
  font-family: var(--mono); font-size: .72rem; letter-spacing: .05em; color: #7E8A86;
}

/* ---------- utilities ---------- */
.mb-0 { margin-bottom: 0; }
.mt-2 { margin-top: 1.6rem; }
.center { text-align: center; }
.small { font-size: .88rem; }
.hide { display: none; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }

/* ---------- motion ---------- */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity .5s ease, transform .5s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  * { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

/* ---------- contact: phone & WhatsApp ---------- */
.ico { width: 1em; height: 1em; fill: currentColor; flex: none; vertical-align: -.12em; }

.topbar-contact { display: flex; gap: 1.1rem; align-items: center; }
.topbar-contact a {
  display: inline-flex; align-items: center; gap: .4rem;
  color: var(--hivis); text-decoration: none;
}
.topbar-contact a:hover { text-decoration: underline; }
.topbar-contact a b { color: inherit; font-weight: 500; }

.site-header .tel-btn, .site-header .wa-btn { gap: .45rem; }
.site-header .tel-btn {
  font-family: var(--mono); font-size: .86rem; letter-spacing: .01em; padding: .72rem .9rem;
}
.site-header .wa-btn { background: #25D366; border-color: #25D366; color: #062513; }
.site-header .wa-btn:hover { background: var(--ink); border-color: var(--ink); color: #25D366; }

.footer-contact { display: flex; flex-wrap: wrap; gap: .4rem 1.4rem; margin-bottom: 1rem; }
.footer-contact a { display: inline-flex; align-items: center; gap: .45rem; }
.footer-contact a:hover { color: var(--hivis); }

/* floating WhatsApp button */
.wa-float {
  position: fixed; right: 1rem; bottom: 1rem; z-index: 80;
  display: inline-flex; align-items: center; gap: .55rem;
  background: #25D366; color: #062513; text-decoration: none;
  padding: .85rem 1.05rem; border-radius: 999px;
  box-shadow: 0 10px 26px rgba(14, 18, 22, .3);
  font-family: var(--display); font-size: 1.05rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: .04em;
  transition: transform .15s ease, box-shadow .15s ease;
}
.wa-float .ico { width: 1.35em; height: 1.35em; }
.wa-float:hover { transform: translateY(-2px); color: #062513; text-decoration: none;
  box-shadow: 0 14px 32px rgba(14, 18, 22, .38); }
.wa-float:focus-visible { outline: 3px solid var(--ink); outline-offset: 3px; }
@media (max-width: 560px) {
  .wa-float { padding: .85rem; border-radius: 50%; }
  .wa-float span { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); }
}
@media (max-width: 640px) {
  .topbar .wrap { flex-direction: column; align-items: flex-start; }
  .topbar-contact { gap: 1rem; }
}

/* in-content internal links sit a little stronger than body text */
.article a, section p a, section li a { font-weight: 500; }