/* ============================================================
   Goldcattle — Custom Transparent Corrugated Plastic Sheet
   Independent stylesheet · namespace .gcs-
   Theme: bright industrial, glass-like transparency, flute motif
   ============================================================ */
:root{
  --gcs-ink:#0e2a3a;
  --gcs-ink-soft:#3c5564;
  --gcs-teal:#0a6c8c;
  --gcs-teal-dk:#084e66;
  --gcs-accent:#1f9bb3;
  --gcs-bg:#f2f6f8;
  --gcs-card:#ffffff;
  --gcs-line:#dbe6ec;
  --gcs-line-soft:#e9f0f4;
  --gcs-amber:#b7791f;
  --gcs-blue:#0052cc;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{background:var(--gcs-bg);color:var(--gcs-ink);font-family:"Segoe UI",system-ui,-apple-system,Roboto,Helvetica,Arial,sans-serif;line-height:1.7;font-size:16px;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:var(--gcs-teal);text-decoration:none}
a:hover{text-decoration:underline}
b,strong{font-weight:700}
.gcs-page{overflow:hidden}

/* ---------- layout ---------- */
.gcs-wrap{max-width:1240px;margin:0 auto;padding:0 24px}
.gcs-section{padding:72px 0}
.gcs-section--soft{background:#fff}
.gcs-kicker{display:inline-block;font-size:12px;font-weight:800;letter-spacing:.16em;text-transform:uppercase;color:var(--gcs-teal);margin-bottom:10px}
.gcs-section h2{font-size:clamp(26px,3.2vw,38px);line-height:1.2;letter-spacing:-.01em;color:var(--gcs-ink);margin-bottom:14px}
.gcs-lede{font-size:17px;color:var(--gcs-ink-soft);max-width:900px;margin-bottom:30px}
.gcs-fine{font-size:13px;color:#6b8291;margin-top:14px}
.gcs-note{font-size:13px;color:#6b8291;text-align:center;margin-top:26px}

/* ---------- hero ---------- */
.gcs-hero{position:relative;background:linear-gradient(150deg,#0b2033 0%,#0d3a4e 55%,#0a6c8c 130%);color:#eaf3f7;overflow:hidden}
.gcs-hero::before{content:"";position:absolute;inset:0;background:
  repeating-linear-gradient(0deg,rgba(255,255,255,.045) 0 1px,transparent 1px 34px),
  repeating-linear-gradient(90deg,rgba(255,255,255,.045) 0 1px,transparent 1px 34px);pointer-events:none}
.gcs-hero::after{content:"";position:absolute;right:-140px;top:-140px;width:480px;height:480px;border-radius:50%;background:radial-gradient(circle,rgba(31,155,179,.28),transparent 65%);pointer-events:none}
.gcs-hero .gcs-wrap{position:relative;display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center;padding-top:76px;padding-bottom:76px}
.gcs-hero-tag{display:inline-block;font-size:12px;font-weight:800;letter-spacing:.14em;text-transform:uppercase;color:#7fd4e4;border:1px solid rgba(127,212,228,.4);border-radius:999px;padding:6px 14px;margin-bottom:20px;background:rgba(127,212,228,.06)}
.gcs-hero-title{font-size:clamp(30px,4vw,50px);line-height:1.12;letter-spacing:-.015em;color:#fff;margin-bottom:16px}
.gcs-hero-sub{font-size:17px;color:#bfd8e2;max-width:560px;margin-bottom:26px}
.gcs-hero-specs{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:26px;max-width:560px}
.gcs-hero-specs div{background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.14);border-radius:10px;padding:10px 14px;font-size:13.5px;color:#d7e8ee}
.gcs-hero-specs b{display:block;font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:#8fd4e2;margin-bottom:2px}
.gcs-cta{display:inline-block;font-size:15px}
.gcs-cta--ghost{background:transparent;color:#fff;border:1.5px solid rgba(255,255,255,.75)!important}
.gcs-hero-meta{display:flex;flex-wrap:wrap;gap:10px 22px;margin-top:28px;font-size:13px;color:#a9c8d4}
.gcs-hero-meta b{color:#fff}
.gcs-hero-visual{position:relative;margin:0}
.gcs-hero-visual img{width:100%;border-radius:16px;border:1px solid rgba(255,255,255,.22);box-shadow:0 24px 60px rgba(0,0,0,.38)}
.gcs-hero-visual figcaption{font-size:12.5px;color:#9fbcc8;margin-top:10px;line-height:1.5}
.gcs-hero-strip{display:grid;grid-template-columns:repeat(2,1fr);gap:8px;margin-top:14px}
.gcs-hero-strip div{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);border-radius:10px;padding:9px 13px;font-size:12.5px;color:#cfe2ea}
.gcs-hero-strip b{display:block;font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:#8fd4e2}

/* ---------- overview ---------- */
.gcs-overview{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.gcs-overview-card{background:var(--gcs-card);border:1px solid var(--gcs-line);border-radius:14px;padding:26px}
.gcs-overview-card h4{font-size:17px;margin-bottom:10px;color:var(--gcs-teal-dk)}
.gcs-overview-card p{font-size:14.5px;color:var(--gcs-ink-soft)}
.gcs-overview-card--key{border-top:3px solid var(--gcs-teal)}
.gcs-term{display:flex;gap:10px;align-items:flex-start;background:#fff;border:1px solid var(--gcs-line);border-radius:10px;padding:14px 16px;margin-top:16px}
.gcs-term b{white-space:nowrap;color:var(--gcs-teal-dk);font-size:14px}
.gcs-term span{font-size:13.5px;color:var(--gcs-ink-soft)}

/* ---------- tables ---------- */
.gcs-table-wrap{background:#fff;border:1px solid var(--gcs-line);border-radius:14px;overflow:hidden;overflow-x:auto}
.gcs-table-wrap table{width:100%;border-collapse:collapse;min-width:640px}
.gcs-table-wrap th{background:var(--gcs-teal-dk);color:#fff;text-align:left;padding:12px 18px;font-size:13px;letter-spacing:.04em}
.gcs-table-wrap td{padding:11px 18px;border-bottom:1px solid var(--gcs-line-soft);font-size:14px;vertical-align:top;color:var(--gcs-ink)}
.gcs-table-wrap tr:last-child td{border-bottom:none}
.gcs-table-wrap td:first-child{font-weight:700;color:var(--gcs-teal-dk);white-space:nowrap}
.gcs-table-wrap tbody tr:nth-child(even){background:#f8fbfc}

/* ---------- flute structure (CSS drawing) ---------- */
.gcs-flute{background:#fff;border:1px solid var(--gcs-line);border-radius:16px;padding:30px;margin-bottom:26px}
.gcs-flute-draw{position:relative;height:150px;border-radius:10px;background:linear-gradient(180deg,#eef6f9,#e3f0f5);overflow:hidden}
.gcs-flute-draw::before{content:"";position:absolute;left:0;right:0;top:0;height:26px;background:linear-gradient(180deg,#cfeef5,#b7e4ef);border-bottom:1px solid #8fd0de}
.gcs-flute-draw::after{content:"";position:absolute;left:0;right:0;bottom:0;height:26px;background:linear-gradient(0deg,#cfeef5,#b7e4ef);border-top:1px solid #8fd0de}
.gcs-flute-draw .ribs{position:absolute;inset:0;background:repeating-linear-gradient(90deg,rgba(10,108,140,.0) 0 26px,rgba(10,108,140,.16) 26px 29px,rgba(10,108,140,.0) 29px 64px)}
.gcs-flute-labels{display:flex;justify-content:space-between;font-size:12.5px;color:var(--gcs-ink-soft);margin-top:12px}
.gcs-flute-labels b{color:var(--gcs-teal-dk)}

/* ---------- cards / grids ---------- */
.gcs-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.gcs-grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.gcs-card{background:#fff;border:1px solid var(--gcs-line);border-radius:14px;padding:24px}
.gcs-card h4{font-size:16px;color:var(--gcs-teal-dk);margin-bottom:8px}
.gcs-card p{font-size:14px;color:var(--gcs-ink-soft)}
.gcs-card ul{list-style:none;margin-top:8px}
.gcs-card li{font-size:13.5px;color:var(--gcs-ink-soft);padding:4px 0 4px 20px;position:relative}
.gcs-card li::before{content:"›";position:absolute;left:4px;color:var(--gcs-teal);font-weight:700}

/* ---------- process flow ---------- */
.gcs-flow{display:flex;flex-wrap:wrap;gap:10px;align-items:stretch;margin:26px 0}
.gcs-flow-step{flex:1 1 120px;background:#fff;border:1px solid var(--gcs-line);border-radius:10px;padding:14px 16px;font-size:13.5px;font-weight:700;color:var(--gcs-teal-dk);text-align:center;position:relative}
.gcs-flow-step small{display:block;font-weight:400;color:var(--gcs-ink-soft);font-size:12px;margin-top:4px}
.gcs-flow-step--key{background:var(--gcs-teal-dk);color:#fff}
.gcs-flow-step--key small{color:#bfe2ec}
.gcs-flow-arrow{align-self:center;color:var(--gcs-teal);font-size:18px;font-weight:800}

/* ---------- callout ---------- */
.gcs-callout{background:#eef7fa;border:1px solid #cfe8f0;border-left:4px solid var(--gcs-teal);border-radius:10px;padding:18px 22px;font-size:14.5px;color:var(--gcs-ink);margin-top:24px}
.gcs-callout b{color:var(--gcs-teal-dk)}

/* ---------- applications ---------- */
.gcs-app{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.gcs-app-card{background:#fff;border:1px solid var(--gcs-line);border-radius:14px;padding:24px}
.gcs-app-card h4{font-size:16px;color:var(--gcs-teal-dk);margin-bottom:8px}
.gcs-app-card p{font-size:14px;color:var(--gcs-ink-soft);margin-bottom:8px}
.gcs-app-tags{display:flex;flex-wrap:wrap;gap:6px}
.gcs-app-tags span{font-size:12px;background:#eef7fa;color:var(--gcs-teal-dk);border:1px solid #d3e9f0;border-radius:999px;padding:3px 10px}

/* ---------- comparison ---------- */
.gcs-compare{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.gcs-compare-box{background:#fff;border:1px solid var(--gcs-line);border-radius:14px;padding:24px}
.gcs-compare-box h4{font-size:16px;margin-bottom:10px;padding-bottom:10px;border-bottom:2px solid var(--gcs-line-soft)}
.gcs-compare-box--pp h4{color:var(--gcs-teal-dk)}
.gcs-compare-box--pc h4{color:var(--gcs-amber)}
.gcs-compare-box ul{list-style:none}
.gcs-compare-box li{font-size:13.5px;color:var(--gcs-ink-soft);padding:5px 0 5px 20px;position:relative}
.gcs-compare-box li::before{content:"·";position:absolute;left:4px;font-size:20px;line-height:1;color:var(--gcs-teal)}

/* ---------- decision tree ---------- */
.gcs-decision{background:linear-gradient(150deg,#0b2033,#0d3a4e);border-radius:16px;padding:30px;margin-top:26px;color:#eaf3f7}
.gcs-decision-title{font-size:18px;font-weight:800;margin-bottom:18px;color:#fff}
.gcs-decision-node{background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.16);border-radius:10px;padding:13px 18px;font-size:14px;margin-bottom:8px}
.gcs-decision-node b{color:#8fd4e2}
.gcs-decision-arrow{color:#4fa9c0;font-size:16px;text-align:center;margin:-2px 0 4px;font-weight:800}

/* ---------- QC / specs ---------- */
.gcs-qc-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.gcs-qc-item{background:#fff;border:1px solid var(--gcs-line);border-radius:10px;padding:14px 18px;display:flex;gap:14px;align-items:baseline}
.gcs-qc-item b{color:var(--gcs-teal-dk);white-space:nowrap;font-size:14px;min-width:110px}
.gcs-qc-item span{font-size:13.5px;color:var(--gcs-ink-soft)}

/* ---------- case study ---------- */
.gcs-case{background:#fff;border:1px solid var(--gcs-line);border-radius:16px;overflow:hidden}
.gcs-case-head{background:var(--gcs-teal-dk);color:#fff;font-weight:800;padding:14px 22px;font-size:15px}
.gcs-case-grid{display:grid;grid-template-columns:1fr 1fr;gap:0}
.gcs-case-cell{padding:22px}
.gcs-case-cell:first-child{border-right:1px solid var(--gcs-line-soft)}
.gcs-case-cell table{width:100%;border-collapse:collapse}
.gcs-case-cell td{padding:7px 0;border-bottom:1px solid var(--gcs-line-soft);font-size:13.5px;vertical-align:top}
.gcs-case-cell td:first-child{font-weight:700;color:var(--gcs-teal-dk);width:38%}
.gcs-case-cell tr:last-child td{border-bottom:none}
.gcs-case-cell h5{font-size:14px;color:var(--gcs-teal-dk);margin:12px 0 4px}
.gcs-case-cell p{font-size:13.5px;color:var(--gcs-ink-soft)}
.gcs-case-gallery{display:grid;grid-template-columns:1fr 1fr;gap:0;border-top:1px solid var(--gcs-line-soft)}
.gcs-case-gallery figure{margin:0}
.gcs-case-gallery img{width:100%;height:260px;object-fit:cover}
.gcs-case-gallery figcaption{font-size:12.5px;color:#6b8291;padding:10px 22px}

/* ---------- RFQ ---------- */
.gcs-rfq{display:grid;grid-template-columns:1.1fr .9fr;gap:18px}
.gcs-rfq-list{background:#fff;border:1px solid var(--gcs-line);border-radius:14px;padding:26px}
.gcs-rfq-list ol{list-style:none;counter-reset:r}
.gcs-rfq-list li{counter-increment:r;font-size:14px;font-weight:700;color:var(--gcs-ink);padding:9px 0 9px 40px;position:relative;border-bottom:1px dashed var(--gcs-line-soft)}
.gcs-rfq-list li:last-child{border-bottom:none}
.gcs-rfq-list li::before{content:counter(r);position:absolute;left:0;top:10px;width:26px;height:26px;background:#eef7fa;border:1px solid #cfe8f0;color:var(--gcs-teal-dk);border-radius:50%;font-size:13px;font-weight:800;display:flex;align-items:center;justify-content:center}
.gcs-rfq-list small{display:block;font-weight:400;color:var(--gcs-ink-soft);font-size:12.5px}
.gcs-rfq-note{background:linear-gradient(160deg,#0b2033,#0d3a4e);border-radius:14px;padding:26px;color:#eaf3f7}
.gcs-rfq-note b{color:#fff;font-size:15px}
.gcs-rfq-note p{font-size:13.5px;color:#bfd8e2;margin-top:10px;padding-left:14px;position:relative}
.gcs-rfq-note p::before{content:"✓";position:absolute;left:0;color:#7fd4e4;font-weight:800}

/* ---------- FAQ ---------- */
.gcs-faq{max-width:100%}
.gcs-faq details{background:#fff;border:1px solid var(--gcs-line);border-radius:12px;margin-bottom:10px;overflow:hidden}
.gcs-faq summary{cursor:pointer;padding:16px 20px;font-weight:700;font-size:15px;color:var(--gcs-ink);list-style:none;position:relative;padding-right:44px}
.gcs-faq summary::-webkit-details-marker{display:none}
.gcs-faq summary::after{content:"+";position:absolute;right:18px;top:12px;font-size:22px;color:var(--gcs-teal);font-weight:400;transition:transform .2s}
.gcs-faq details[open] summary::after{transform:rotate(45deg)}
.gcs-faq .gcs-answer{padding:0 20px 18px;border-top:1px solid var(--gcs-line-soft)}
.gcs-faq .gcs-answer p{font-size:14px;color:var(--gcs-ink-soft);padding-top:14px}

/* ---------- related ---------- */
.gcs-rel{display:flex;flex-wrap:wrap;gap:10px}
.gcs-rel a{background:#fff;border:1px solid var(--gcs-line);border-radius:999px;padding:9px 18px;font-size:13.5px;font-weight:600;color:var(--gcs-teal-dk);transition:all .15s}
.gcs-rel a:hover{background:var(--gcs-teal-dk);color:#fff;text-decoration:none;border-color:var(--gcs-teal-dk)}

/* ---------- final CTA ---------- */
.gcs-final{background:linear-gradient(150deg,#0b2033,#0d3a4e 70%,#0a6c8c);border-radius:20px;padding:56px 40px;text-align:center;color:#eaf3f7;position:relative;overflow:hidden}
.gcs-final::before{content:"";position:absolute;inset:0;background:repeating-linear-gradient(0deg,rgba(255,255,255,.04) 0 1px,transparent 1px 30px);pointer-events:none}
.gcs-final h2{color:#fff;margin-bottom:12px}
.gcs-final p{color:#bfd8e2;max-width:640px;margin:0 auto 26px;font-size:15.5px}

/* ---------- responsive ---------- */
@media (max-width:960px){
  .gcs-hero .gcs-wrap{grid-template-columns:1fr;padding-top:56px;padding-bottom:56px}
  .gcs-overview,.gcs-grid,.gcs-app,.gcs-qc-grid,.gcs-grid-2{grid-template-columns:1fr}
  .gcs-case-grid{grid-template-columns:1fr}
  .gcs-case-cell:first-child{border-right:none;border-bottom:1px solid var(--gcs-line-soft)}
  .gcs-rfq{grid-template-columns:1fr}
  .gcs-compare{grid-template-columns:1fr}
  .gcs-case-gallery{grid-template-columns:1fr}
  .gcs-hero-specs{grid-template-columns:1fr}
}
@media (max-width:600px){
  .gcs-section{padding:52px 0}
  .gcs-final{padding:44px 22px}
  .gcs-flow-arrow{transform:rotate(90deg)}
}