/* ========================================================================
   Golden Leaf Energy — Corporate Site Stylesheet
   ======================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

:root {
  --blue: #1e4a72;
  --blue-dark: #14334f;
  --blue-darker: #0c2238;
  --blue-light: #4a7ba6;
  --blue-pale: #e8eef5;
  --gold: #a08030;
  --gold-bright: #c8a052;
  --gray-900: #1a1f26;
  --gray-700: #4a5260;
  --gray-500: #6b7280;
  --gray-400: #9ca3af;
  --gray-300: #d1d5db;
  --gray-200: #e5e7eb;
  --gray-100: #f3f4f6;
  --gray-50: #f9fafb;
  --white: #ffffff;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: 'Inter', -apple-system, system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--gray-900);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img { max-width: 100%; display: block; }
a { color: var(--blue); text-decoration: none; transition: color .2s ease; }
a:hover { color: var(--blue-dark); }

h1, h2, h3, h4, h5 { color: var(--gray-900); font-weight: 700; line-height: 1.15; letter-spacing: -.01em; }
h1 { font-size: clamp(2.5rem, 5.5vw, 4rem); font-weight: 700; line-height: 1.05; letter-spacing: -.02em; }
h2 { font-size: clamp(1.9rem, 3.5vw, 2.6rem); }
h3 { font-size: 1.35rem; font-weight: 600; }
h4 { font-size: 1.1rem; font-weight: 600; }
p { color: var(--gray-700); margin: 0 0 1rem; }

/* ---------- Container ---------- */
.container { width: 100%; max-width: 1280px; margin: 0 auto; padding: 0 2rem; }

/* ---------- Utility bar ---------- */
.utility-bar {
  background: var(--blue-darker);
  color: rgba(255,255,255,.8);
  font-size: .78rem;
  padding: .5rem 0;
}
.utility-bar .container {
  display: flex; justify-content: flex-end; gap: 1.8rem;
}
.utility-bar a { color: rgba(255,255,255,.8); }
.utility-bar a:hover { color: var(--white); }

/* ---------- Header ---------- */
.header {
  background: var(--white);
  border-bottom: 1px solid var(--gray-300);
  position: sticky; top: 0; z-index: 50;
}
.header .container {
  display: flex; align-items: center; justify-content: space-between;
  padding-top: .8rem; padding-bottom: .8rem;
}
.logo { display: flex; align-items: center; }
.logo img {
  height: 56px; width: auto; display: block;
}
.logo-fallback {
  font-size: 1.3rem; font-weight: 700;
  color: var(--gold); letter-spacing: -.01em;
}
.nav { display: flex; gap: 2rem; align-items: center; }
.nav > a {
  font-size: .92rem; font-weight: 500; color: var(--gray-700);
  padding: .3rem 0; position: relative;
  text-transform: none;
}
.nav > a:hover, .nav > a.active { color: var(--blue); }
.nav > a.active::after {
  content: ''; position: absolute; left: 0; right: 0; bottom: -1.4rem;
  height: 3px; background: var(--blue);
}
.nav-toggle { display: none; background: none; border: 0; cursor: pointer; padding: .5rem; }
.nav-toggle span { display: block; width: 24px; height: 2px; background: var(--gray-700); margin: 5px 0; }

@media (max-width: 900px) {
  .nav { display: none; position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: var(--white); border-bottom: 1px solid var(--gray-300);
    padding: 1rem 2rem; }
  .nav.open { display: flex; }
  .nav > a { padding: .8rem 0; border-bottom: 1px solid var(--gray-200); }
  .nav-toggle { display: block; }
  .utility-bar { display: none; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  padding: .9rem 1.8rem;
  background: var(--blue);
  color: var(--white) !important;
  font-size: .9rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .05em;
  border: 0;
  cursor: pointer;
  transition: background .2s ease;
  font-family: inherit;
}
.btn:hover { background: var(--blue-dark); }
.btn-outline {
  background: transparent;
  border: 2px solid var(--white);
  color: var(--white) !important;
  padding: .8rem 1.7rem;
}
.btn-outline:hover { background: var(--white); color: var(--blue) !important; }
.btn-gold { background: var(--gold); }
.btn-gold:hover { background: var(--gold-bright); }
.btn-arrow::after { content: '→'; transition: transform .2s ease; }
.btn-arrow:hover::after { transform: translateX(4px); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  height: 78vh;
  min-height: 580px;
  max-height: 760px;
  overflow: hidden;
  background: var(--blue-dark);
}
.hero-img {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  filter: brightness(.65);
}
.hero-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(120deg, rgba(20,51,79,.72) 0%, rgba(20,51,79,.32) 60%, transparent 100%);
}
.hero-content {
  position: relative; z-index: 2;
  height: 100%; display: flex; align-items: center;
}
.hero-content .container { width: 100%; }
.hero h1 {
  color: var(--white);
  max-width: 18ch;
  margin-bottom: 1.5rem;
}
.hero p {
  color: rgba(255,255,255,.92);
  font-size: 1.2rem;
  max-width: 50ch;
  margin-bottom: 2rem;
  font-weight: 300;
}

@media (max-width: 900px) {
  .hero { height: auto; padding: 5rem 0 4rem; min-height: 0; }
}

/* ---------- Page header (interior pages) ---------- */
.page-header {
  position: relative;
  background: var(--blue-dark);
  color: var(--white);
  padding: 5rem 0 4rem;
  overflow: hidden;
}
.page-header::before {
  content: ''; position: absolute; inset: 0;
  background:
    radial-gradient(circle at 80% 20%, rgba(74,123,166,.35), transparent 50%),
    radial-gradient(circle at 0% 80%, rgba(200,160,82,.12), transparent 60%);
}
.page-header .container { position: relative; z-index: 1; }
.page-header .crumbs {
  font-size: .78rem; letter-spacing: .12em; text-transform: uppercase;
  color: rgba(255,255,255,.6); margin-bottom: 1.5rem; font-weight: 500;
}
.page-header .crumbs a { color: rgba(255,255,255,.6); }
.page-header .crumbs a:hover { color: var(--white); }
.page-header .crumbs span { margin: 0 .6rem; color: var(--gold-bright); }
.page-header h1 {
  color: var(--white);
  max-width: 22ch;
  margin-bottom: 1.2rem;
}
.page-header p.lead {
  font-size: 1.18rem; line-height: 1.6;
  color: rgba(255,255,255,.85);
  max-width: 60ch;
  font-weight: 300;
}

/* ---------- Section ---------- */
.section { padding: 5rem 0; }
.section-tight { padding: 3rem 0; }
.section-gray { background: var(--gray-50); }
.section-blue { background: var(--blue-dark); color: var(--white); }
.section-blue h2, .section-blue h3 { color: var(--white); }
.section-blue p { color: rgba(255,255,255,.85); }

.section-header { text-align: center; margin-bottom: 3.5rem; }
.section-header h2 { margin-bottom: .6rem; }
.section-header .subhead {
  color: var(--gray-500);
  font-size: 1.05rem;
  font-weight: 500;
}
.section-blue .section-header .subhead { color: rgba(255,255,255,.7); }

/* ---------- Three-up cards ---------- */
.three-up {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}
.four-up {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}
.four-up .tech-card { padding: 2rem 1.2rem; }
.four-up .tech-card h3 { font-size: 1.15rem; }
.four-up .tech-card p { font-size: .88rem; }
.four-up .tech-card .icon { width: 56px; height: 56px; margin-bottom: 1.2rem; }
.four-up .tech-card .icon svg { width: 28px; height: 28px; }
.tech-card {
  background: var(--white);
  border: 1px solid var(--gray-300);
  padding: 2.5rem 2rem;
  text-align: center;
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
}
.tech-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 28px -10px rgba(30,74,114,.18);
  border-color: var(--blue-light);
}
.tech-card .icon {
  width: 64px; height: 64px;
  margin: 0 auto 1.5rem;
  display: grid; place-items: center;
  background: var(--blue-pale);
  border-radius: 50%;
  color: var(--blue);
}
.tech-card .icon svg { width: 32px; height: 32px; }
.tech-card h3 { color: var(--gray-900); margin-bottom: .8rem; }
.tech-card p {
  color: var(--gray-700);
  font-size: .95rem;
  margin-bottom: 1.5rem;
}
.tech-card .more {
  font-size: .82rem;
  font-weight: 600;
  color: var(--blue);
  text-transform: uppercase;
  letter-spacing: .08em;
}
.tech-card .more::after {
  content: ' →';
  transition: transform .2s ease;
  display: inline-block;
}
.tech-card:hover .more::after { transform: translateX(4px); }

@media (max-width: 900px) {
  .three-up { grid-template-columns: 1fr; }
  .four-up { grid-template-columns: repeat(2, 1fr); gap: 1rem; }
}
@media (max-width: 600px) {
  .four-up { grid-template-columns: 1fr; }
}

/* ---------- About cards (homepage bottom) ---------- */
.about-card { text-align: center; }
.about-card .icon {
  width: 72px; height: 72px;
  margin: 0 auto 1.5rem;
  display: grid; place-items: center;
  background: var(--blue);
  border-radius: 50%;
  color: var(--white);
}
.about-card .icon svg { width: 34px; height: 34px; }
.about-card h3 { color: var(--gray-900); margin-bottom: .8rem; }
.about-card p { color: var(--gray-700); font-size: .95rem; margin-bottom: 1.5rem; }
.about-card .more {
  font-size: .82rem; font-weight: 600; color: var(--blue);
  text-transform: uppercase; letter-spacing: .08em;
}

/* ---------- Markets photo grid ---------- */
.market-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}
.market-card {
  position: relative;
  height: 320px;
  overflow: hidden;
  background: var(--blue-dark);
  cursor: pointer;
  display: block;
}
.market-card img {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform .6s ease;
  filter: brightness(.75);
}
.market-card:hover img { transform: scale(1.05); }
.market-card .market-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 30%, rgba(20,51,79,.85) 100%);
}
.market-card .market-content {
  position: absolute; bottom: 0; left: 0; right: 0;
  padding: 2rem;
  color: var(--white);
}
.market-card h3 {
  color: var(--white);
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: .5rem;
  letter-spacing: -.01em;
}
.market-card p {
  font-size: .95rem;
  color: rgba(255,255,255,.9);
  margin-bottom: 1rem;
  font-weight: 400;
}
.market-card .market-link {
  font-size: .82rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--white);
  display: inline-flex;
  align-items: center;
  gap: .4rem;
}
.market-card .market-link::after {
  content: '→'; transition: transform .25s ease;
}
.market-card:hover .market-link::after { transform: translateX(5px); }

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

/* ---------- Two-column content blocks ---------- */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}
.two-col.flip > :first-child { order: 2; }
.two-col img.feature {
  width: 100%; aspect-ratio: 4/3; object-fit: cover;
}
@media (max-width: 900px) {
  .two-col { grid-template-columns: 1fr; gap: 2rem; }
  .two-col.flip > :first-child { order: 0; }
}

/* ---------- Product list ---------- */
.product-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 0;
  border-top: 1px solid var(--gray-300);
  border-left: 1px solid var(--gray-300);
}
.product-item {
  padding: 2rem;
  border-right: 1px solid var(--gray-300);
  border-bottom: 1px solid var(--gray-300);
  transition: background .2s ease;
}
.product-item:hover { background: var(--gray-50); }
.product-item .cat {
  font-size: .7rem; letter-spacing: .14em; text-transform: uppercase;
  font-weight: 600; color: var(--blue); margin-bottom: .8rem;
}
.product-item h3 { font-size: 1.2rem; margin-bottom: .6rem; }
.product-item p { font-size: .92rem; margin-bottom: 1rem; }
.product-item .more {
  font-size: .78rem; font-weight: 600; color: var(--blue);
  text-transform: uppercase; letter-spacing: .08em;
}

/* ---------- Grouped product layout (shared image) ---------- */
.product-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}
.product-group.flip .product-group-image { order: 2; }
.product-group-image {
  position: sticky;
  top: 110px;
}
.product-group-image img {
  width: 100%;
  aspect-ratio: 4/5;
  object-fit: cover;
}
.product-group-content > .group-item {
  padding-bottom: 3rem;
  margin-bottom: 3rem;
  border-bottom: 1px solid var(--gray-300);
}
.product-group-content > .group-item:last-child {
  border-bottom: 0;
  margin-bottom: 0;
  padding-bottom: 0;
}
.product-group-content .cat {
  font-size: .7rem; letter-spacing: .16em; text-transform: uppercase;
  color: var(--blue); font-weight: 600; margin-bottom: .8rem;
}
.product-group-content h3 {
  font-size: 1.7rem; font-weight: 700;
  letter-spacing: -.01em; margin-bottom: .8rem;
}
.product-group-content .lead {
  font-size: 1.05rem; color: var(--gray-700); margin-bottom: 1rem;
}
.product-group-content .group-applications {
  font-size: .85rem; color: var(--gray-700);
  margin-top: 1rem;
}
.product-group-content .group-applications strong {
  display: block;
  font-size: .68rem; letter-spacing: .14em; text-transform: uppercase;
  color: var(--blue); margin-bottom: .5rem; font-weight: 600;
}
.product-group-content .specs-mini {
  display: flex; flex-wrap: wrap; gap: 0;
  margin-top: 1rem;
  border-top: 2px solid var(--blue);
}
.product-group-content .specs-mini .spec-mini {
  padding: .8rem 1rem;
  border-right: 1px solid var(--gray-200);
  border-bottom: 1px solid var(--gray-200);
  flex: 1 1 140px;
  background: var(--white);
}
.product-group-content .specs-mini dt {
  font-size: .65rem; letter-spacing: .14em; text-transform: uppercase;
  color: var(--gray-500); font-weight: 600; margin-bottom: .25rem;
}
.product-group-content .specs-mini dd {
  font-size: .95rem; color: var(--gray-900); font-weight: 600;
}
@media (max-width: 900px) {
  .product-group { grid-template-columns: 1fr; gap: 2rem; }
  .product-group-image { position: static; }
  .product-group-image img { aspect-ratio: 4/3; max-height: 400px; }
  .product-group.flip .product-group-image { order: 0; }
}

/* ---------- Spec table (product detail) ---------- */
.specs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0;
  margin-top: 2rem;
  border-top: 2px solid var(--blue);
  border-left: 1px solid var(--gray-200);
}
.spec {
  padding: 1.4rem;
  border-right: 1px solid var(--gray-200);
  border-bottom: 1px solid var(--gray-200);
  background: var(--white);
}
.spec dt {
  font-size: .68rem; letter-spacing: .14em; text-transform: uppercase;
  color: var(--gray-500); font-weight: 600; margin-bottom: .35rem;
}
.spec dd { font-size: 1.05rem; color: var(--gray-900); font-weight: 600; }

/* ---------- Application list ---------- */
.app-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: .8rem;
  margin-top: 1.5rem;
}
.app-list li {
  padding: .9rem 1rem .9rem 2.2rem;
  background: var(--blue-pale);
  position: relative;
  font-size: .92rem;
  color: var(--gray-900);
  font-weight: 500;
}
.app-list li::before {
  content: '';
  position: absolute; left: .9rem; top: 50%;
  width: 8px; height: 8px;
  background: var(--blue);
  border-radius: 50%;
  transform: translateY(-50%);
}

/* ---------- CTA section ---------- */
.cta {
  background: var(--blue-dark);
  color: var(--white);
  padding: 4rem 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(circle at 50% 50%, rgba(74,123,166,.25), transparent 60%);
}
.cta .container { position: relative; z-index: 1; }
.cta h2 { color: var(--white); margin-bottom: 1rem; }
.cta p { color: rgba(255,255,255,.85); font-size: 1.1rem; margin-bottom: 2rem; max-width: 50ch; margin-left: auto; margin-right: auto; }

/* ---------- Process steps (technology page) ---------- */
.steps { counter-reset: step; margin-top: 2rem; }
.step {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 2rem;
  padding: 2rem 0;
  border-bottom: 1px solid var(--gray-200);
  align-items: start;
}
.step:last-child { border-bottom: 0; }
.step::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  font-size: 2rem;
  font-weight: 800;
  color: var(--blue);
  line-height: 1;
}
.step h3 { margin-bottom: .5rem; }
@media (max-width: 720px) { .step { grid-template-columns: 1fr; gap: .5rem; } }

/* ---------- Form ---------- */
.form-card {
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  padding: 2.5rem;
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1.2rem; margin-bottom: 1.2rem; }
@media (max-width: 600px) { .form-row { grid-template-columns: 1fr; } }
.field label {
  display: block;
  font-size: .72rem; letter-spacing: .12em; text-transform: uppercase;
  color: var(--gray-500); font-weight: 600; margin-bottom: .5rem;
}
.field input, .field select, .field textarea {
  width: 100%; padding: .85rem 1rem;
  font-family: inherit; font-size: 1rem;
  background: var(--white);
  border: 1px solid var(--gray-300);
  color: var(--gray-900);
  transition: border-color .2s, box-shadow .2s;
}
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(30,74,114,.15);
}
.field textarea { min-height: 140px; resize: vertical; }

/* ---------- Footer ---------- */
.footer {
  background: var(--blue-darker);
  color: rgba(255,255,255,.8);
  padding: 4rem 0 1.5rem;
  font-size: .9rem;
}
.footer a { color: rgba(255,255,255,.8); }
.footer a:hover { color: var(--white); }
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}
@media (max-width: 720px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
.footer h5 {
  color: var(--gold-bright);
  font-size: .75rem; font-weight: 600;
  letter-spacing: .14em; text-transform: uppercase;
  margin-bottom: 1.2rem;
}
.footer ul { list-style: none; }
.footer li { margin-bottom: .55rem; }
.footer-logo { margin-bottom: 1rem; }
.footer-logo img { height: 56px; width: auto; display: block; }
.footer-tag { color: rgba(255,255,255,.6); max-width: 32ch; line-height: 1.5; }
.footer-bottom {
  display: flex; justify-content: space-between; align-items: center;
  padding-top: 1.5rem; border-top: 1px solid rgba(255,255,255,.12);
  font-size: .78rem; color: rgba(255,255,255,.5);
  flex-wrap: wrap; gap: 1rem;
}

/* ---------- Reveal ---------- */
.reveal { opacity: 0; transform: translateY(15px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }