/* =========================================================
   Green Technology Global — Shared Stylesheet
   Design language: engineering / infrastructure / resilience.
   Palette avoids generic cream+terracotta defaults in favor of
   a deep "night atmosphere" ink, a water-teal accent, and a
   grounded clay/brass secondary (soil, food resilience).
   ========================================================= */

:root {
  --ink: #142420;          /* near-black, deep bottle-green */
  --paper: #E8E4D6;        /* cool stone background */
  --paper-raised: #FFFFFF;
  --line: #D7D2C2;         /* hairline rule color */
  --teal: #157A8C;         /* water / primary accent */
  --teal-dark: #0E5866;
  --clay: #A3714A;         /* soil / resilience secondary */
  --fern: #4C7A45;         /* organic / food resilience */
  --ink-soft: #3C4A46;     /* muted body text */
  --max-w: 1120px;

  --font-display: 'Spectral', Georgia, 'Times New Roman', serif;
  --font-body: 'IBM Plex Sans', -apple-system, Segoe UI, sans-serif;
  --font-mono: 'IBM Plex Mono', 'Courier New', monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
}

img { max-width: 100%; display: block; }

a { color: var(--teal-dark); }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--ink);
  line-height: 1.15;
  margin: 0 0 0.5em;
}

h1 { font-size: clamp(2.2rem, 4vw, 3.4rem); font-weight: 600; }
h2 { font-size: clamp(1.6rem, 2.6vw, 2.2rem); font-weight: 600; }
h3 { font-size: 1.3rem; font-weight: 600; }

p { margin: 0 0 1em; color: var(--ink-soft); }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--teal-dark);
  display: inline-block;
  margin-bottom: 0.9em;
}

.wrap {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 28px;
}

/* ---------- Header / Nav ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(242, 240, 232, 0.92);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 78px;
}

.logo {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: 0.01em;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.logo img { height: 34px; width: auto; display: block; }
.logo span { color: var(--teal); }

.nav-links {
  display: flex;
  gap: 22px;
  list-style: none;
  margin: 0 0 0 48px;
  padding: 0;
  justify-content: flex-end;
}

.nav-links a {
  font-size: 0.88rem;
  color: var(--ink-soft);
  text-decoration: none;
  font-weight: 500;
  border-bottom: 2px solid transparent;
  padding-bottom: 4px;
  white-space: nowrap;
  transition: color .15s ease, border-color .15s ease;
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--ink);
  border-color: var(--teal);
}

.nav-toggle { display: none; }

@media (max-width: 1080px) {
  .nav-links {
    position: absolute;
    top: 78px; left: 0; right: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    padding: 18px 28px 26px;
    display: none;
    gap: 14px;
  }
  .nav-links.open { display: flex; }
  .nav-toggle {
    display: inline-flex;
    background: none;
    border: 1px solid var(--line);
    border-radius: 4px;
    padding: 8px 10px;
    cursor: pointer;
    font-family: var(--font-mono);
    font-size: 0.85rem;
  }
}

/* ---------- Hero ---------- */

.hero {
  padding: 76px 0 64px;
  border-bottom: 1px solid var(--line);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; }
}

.hero-stats {
  display: flex;
  gap: 28px;
  margin-top: 28px;
  flex-wrap: wrap;
}
.hero-stat .num {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  color: var(--teal-dark);
  display: block;
}
.hero-stat .lbl {
  font-size: 0.8rem;
  color: var(--ink-soft);
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  text-decoration: none;
  padding: 13px 22px;
  border-radius: 3px;
  border: 1px solid transparent;
  transition: background .15s ease, color .15s ease, border-color .15s ease;
}
.btn-primary {
  background: var(--teal-dark);
  color: #fff;
}
.btn-primary:hover { background: var(--ink); }
.btn-ghost {
  border-color: var(--ink);
  color: var(--ink);
}
.btn-ghost:hover { background: var(--ink); color: #fff; }

/* ---------- Sections ---------- */

section.block {
  padding: 64px 0;
  border-bottom: 1px solid var(--line);
}
section.block:last-of-type { border-bottom: none; }

.section-head {
  max-width: 640px;
  margin-bottom: 40px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
@media (max-width: 860px) {
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
}

.card {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 28px;
}
.card .fig {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--clay);
  letter-spacing: 0.08em;
  margin-bottom: 12px;
  display: block;
}

/* ---------- Process / stage diagram ---------- */

.stage-list {
  list-style: none;
  margin: 0; padding: 0;
  counter-reset: stage;
}
.stage-list li {
  counter-increment: stage;
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 18px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
}
.stage-list li:first-child { border-top: none; }
.stage-list li::before {
  content: counter(stage, decimal-leading-zero);
  font-family: var(--font-mono);
  color: var(--teal);
  font-size: 1.1rem;
  padding-top: 2px;
}

/* ---------- Product cards with photos ---------- */

.product-card {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: 6px;
  overflow: hidden;
}
.product-card .photo {
  width: 100%;
  height: 190px;
  object-fit: contain;
  background: #EDEAE0;
  padding: 14px;
}
.product-card .body { padding: 22px; }
.product-card .fig {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--clay);
  letter-spacing: 0.08em;
  display: block;
  margin-bottom: 8px;
}
.product-card table.specs { font-size: 0.85rem; }
.product-card table.specs th, .product-card table.specs td { padding: 8px 10px; }

/* ---------- FAQ ---------- */

details.faq-item {
  border-bottom: 1px solid var(--line);
  padding: 18px 0;
}
details.faq-item summary {
  font-family: var(--font-display);
  font-size: 1.08rem;
  cursor: pointer;
  color: var(--ink);
  list-style: none;
}
details.faq-item summary::-webkit-details-marker { display: none; }
details.faq-item summary::before {
  content: "Q";
  font-family: var(--font-mono);
  color: var(--teal);
  margin-right: 12px;
  font-size: 0.85rem;
}
details.faq-item[open] summary { margin-bottom: 10px; }

/* ---------- Table (specs) ---------- */

table.specs {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}
table.specs th, table.specs td {
  text-align: left;
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
}
table.specs th {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

/* ---------- CTA banner ---------- */

.cta-banner {
  background: var(--ink);
  color: #fff;
  border-radius: 8px;
  padding: 48px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}
.cta-banner h2 { color: #fff; }
.cta-banner p { color: #C9D4D0; }

/* ---------- Footer ---------- */

.site-footer {
  background: var(--ink);
  color: #C9D4D0;
  padding: 56px 0 28px;
}
.site-footer a { color: #E7ECEA; }
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 40px;
}
@media (max-width: 860px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
.footer-grid h4 {
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 14px;
}
.footer-grid ul { list-style: none; margin: 0; padding: 0; }
.footer-grid li { margin-bottom: 8px; }
.footer-grid a { text-decoration: none; font-size: 0.92rem; color: #C9D4D0; }
.footer-grid a:hover { color: #fff; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.15);
  padding-top: 22px;
  font-size: 0.8rem;
  color: #8FA39E;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- Schematic hero graphic ---------- */

.schematic { width: 100%; height: auto; }

/* ---------- Page header (interior pages) ---------- */

.page-header {
  padding: 56px 0 40px;
  border-bottom: 1px solid var(--line);
}
.breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--ink-soft);
  margin-bottom: 14px;
}
.breadcrumb a { color: var(--ink-soft); text-decoration: none; }
.breadcrumb a:hover { color: var(--teal-dark); }