/* ============================================================
   DERPA INDUSTRIAL POLYMERS — plain HTML/CSS
   ============================================================ */

:root {
  --navy-deep: #0a1a3a;
  --navy: #14284d;
  --royal: #2a4494;
  --gold: #c9a84c;
  --gold-light: #e0be5f;
  --paper: #f7f5f0;
  --card: #ffffff;
  --border: #e5e2d8;
  --text: #1a1a1a;
  --muted: #5c5c5c;
  --danger: #b91c1c;
  --shadow-card: 0 6px 24px rgba(10, 26, 58, 0.08);
  --shadow-gold: 0 8px 32px rgba(201, 168, 76, 0.28);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--text);
  background: var(--paper);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, h4 {
  font-family: 'Oswald', 'Arial Narrow', Impact, sans-serif;
  font-weight: 700;
  color: var(--navy);
  line-height: 1.15;
  margin: 0;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}
.section { padding: 80px 0; }
@media (min-width: 768px) { .section { padding: 100px 0; } }

.gold-rule {
  display: inline-block;
  width: 60px;
  height: 3px;
  background: var(--gold);
  margin-bottom: 20px;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.3em;
  color: var(--gold);
  font-size: 12px;
  font-weight: 600;
  margin: 0 0 12px 0;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border-radius: 2px;
  border: 2px solid transparent;
  cursor: pointer;
  transition: all .25s ease;
}
.btn-gold {
  background: var(--gold);
  color: var(--navy-deep);
}
.btn-gold:hover { background: var(--gold-light); box-shadow: var(--shadow-gold); }
.btn-outline {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.7);
}
.btn-outline:hover { background: #fff; color: var(--navy-deep); }
.btn-navy {
  background: var(--navy-deep);
  color: #fff;
}
.btn-navy:hover { background: var(--royal); }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(10, 26, 58, 0.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(201, 168, 76, 0.2);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: #fff;
}
.brand img { height: 40px; width: auto; }
.brand-text { line-height: 1.1; }
.brand-text .name {
  font-family: 'Oswald', 'Arial Narrow', Impact, sans-serif;
  font-size: 22px;
  font-weight: 700;
  color: #fff;
  letter-spacing: 0.05em;
}
.brand-text .tagline {
  font-size: 11px;
  color: var(--gold);
  text-transform: uppercase;
  letter-spacing: 0.15em;
}
.nav {
  display: flex;
  align-items: center;
  gap: 6px;
}
.nav a {
  padding: 8px 14px;
  color: rgba(255,255,255,0.85);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  transition: color .2s;
}
.nav a:hover, .nav a.active { color: var(--gold); }

.menu-toggle {
  display: none;
  background: transparent;
  border: 1px solid rgba(255,255,255,0.3);
  color: #fff;
  padding: 8px 12px;
  cursor: pointer;
  font-size: 14px;
  border-radius: 2px;
}
@media (max-width: 900px) {
  .nav {
    position: absolute;
    top: 76px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--navy-deep);
    padding: 16px 24px;
    display: none;
    border-bottom: 1px solid rgba(201,168,76,0.25);
  }
  .nav.open { display: flex; align-items: stretch; }
  .nav a { padding: 12px 0; }
  .menu-toggle { display: inline-block; }
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 88vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  color: #fff;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(10,26,58,0.92) 0%, rgba(10,26,58,0.75) 60%, rgba(20,40,77,0.75) 100%);
}
.hero-grid {
  position: absolute;
  inset: 0;
  opacity: 0.15;
  background-image:
    linear-gradient(rgba(255,255,255,0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.06) 1px, transparent 1px);
  background-size: 40px 40px;
}
.hero-content { position: relative; padding: 80px 0; max-width: 780px; }
.hero h1 {
  color: #fff;
  font-size: clamp(2.25rem, 5vw, 4.5rem);
  margin-top: 8px;
}
.hero p.lead {
  font-size: clamp(1.05rem, 1.6vw, 1.35rem);
  color: rgba(255,255,255,0.88);
  margin-top: 24px;
  max-width: 620px;
}
.hero-ctas { margin-top: 40px; display: flex; flex-wrap: wrap; gap: 16px; }

/* ---------- Small page hero (about, products, etc.) ---------- */
.page-hero {
  position: relative;
  color: #fff;
  padding: 100px 0 80px;
  overflow: hidden;
}
.page-hero .hero-bg { filter: brightness(0.5); }
.page-hero > .container { position: relative; z-index: 2; }
.page-hero h1 { color: #fff; font-size: clamp(2rem, 4vw, 3.5rem); }
.page-hero p { color: rgba(255,255,255,0.85); font-size: 1.1rem; margin-top: 16px; max-width: 640px; }

/* ---------- Stats strip ---------- */
.stats {
  background: var(--navy-deep);
  border-top: 1px solid rgba(201,168,76,0.2);
  border-bottom: 1px solid rgba(201,168,76,0.2);
}
.stats .grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  divide: 1px solid rgba(255,255,255,0.1);
}
@media (min-width: 768px) { .stats .grid { grid-template-columns: repeat(4, 1fr); } }
.stat {
  padding: 40px 20px;
  text-align: center;
  border-right: 1px solid rgba(255,255,255,0.08);
}
.stat:last-child { border-right: 0; }
.stat .num {
  font-family: 'Oswald', 'Arial Narrow', Impact, sans-serif;
  font-size: clamp(2rem, 3vw, 3rem);
  color: var(--gold);
  font-weight: 700;
}
.stat .label {
  font-size: 12px;
  color: rgba(255,255,255,0.75);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-top: 6px;
}

/* ---------- Generic cards / grid ---------- */
.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: 1fr; }
.grid-3 { grid-template-columns: 1fr; }
.grid-4 { grid-template-columns: 1fr; }
@media (min-width: 700px) {
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1000px) {
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-card);
  transition: box-shadow .3s, border-color .3s;
}
.card:hover {
  box-shadow: var(--shadow-gold);
  border-color: var(--gold);
}

/* ---------- Section header ---------- */
.section-head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 56px;
}
.section-head h2 { font-size: clamp(1.75rem, 3vw, 2.5rem); }
.section-head p { color: var(--muted); margin-top: 16px; }

/* ---------- Product cards ---------- */
.product-card {
  display: flex;
  flex-direction: column;
  background: #fff;
  border: 1px solid var(--border);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: box-shadow .3s, transform .3s;
}
.product-card:hover { box-shadow: var(--shadow-gold); transform: translateY(-3px); }
.product-media {
  position: relative;
  aspect-ratio: 4/3;
  overflow: hidden;
  background: #eef;
}
.product-media img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform .5s;
}
.product-card:hover .product-media img { transform: scale(1.05); }
.spec-badge {
  position: absolute;
  top: 12px; left: 12px;
  background: var(--gold);
  color: var(--navy-deep);
  font-size: 11px;
  font-weight: 700;
  padding: 5px 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.product-title {
  position: absolute;
  bottom: 12px; left: 16px; right: 16px;
  color: #fff;
  font-family: 'Oswald', 'Arial Narrow', Impact, sans-serif;
  font-size: 1.2rem;
  font-weight: 700;
  text-shadow: 0 2px 8px rgba(0,0,0,0.55);
}
.product-media::after {
  content: '';
  position: absolute; inset: 50% 0 0 0;
  background: linear-gradient(to top, rgba(10,26,58,0.85), transparent);
  pointer-events: none;
}
.product-body {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}
.product-body p { color: var(--muted); font-size: 0.95rem; margin: 0 0 16px; }
.gallery-thumbs {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
  margin-bottom: 16px;
}
.gallery-thumbs .thumb {
  aspect-ratio: 4/3;
  overflow: hidden;
  background: #eef;
  border: 1px solid var(--border);
}
.gallery-thumbs .thumb img { width: 100%; height: 100%; object-fit: cover; }

details.specs {
  margin-top: auto;
  border-top: 1px solid var(--border);
  padding-top: 12px;
}
details.specs summary {
  cursor: pointer;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--navy);
  padding: 6px 0;
  list-style: none;
}
details.specs summary::-webkit-details-marker { display: none; }
details.specs summary::after { content: ' +'; color: var(--gold); }
details.specs[open] summary::after { content: ' –'; }
.spec-list { margin: 12px 0 0; padding: 0; list-style: none; font-size: 0.9rem; }
.spec-list li {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 8px;
  padding: 6px 0;
  border-bottom: 1px dashed var(--border);
}
.spec-list li:last-child { border-bottom: 0; }
.spec-list li strong { color: var(--muted); font-weight: 500; }
.spec-list li span { color: var(--navy); font-weight: 500; }
.enquiry-link {
  margin-top: 16px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--royal);
  font-weight: 600;
  font-size: 0.9rem;
}
.enquiry-link:hover { color: var(--gold); }

/* ---------- Cert strip ---------- */
.cert-strip {
  padding: 40px 0;
  background: var(--card);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.cert-strip .container {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  align-items: center;
}
.cert-badge {
  padding: 10px 20px;
  background: var(--paper);
  border: 1px solid var(--border);
  color: var(--navy);
  font-family: 'Oswald', 'Arial Narrow', Impact, sans-serif;
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.cert-strip .eyebrow { width: 100%; text-align: center; }

/* ---------- CTA section ---------- */
.cta {
  background: var(--navy-deep);
  color: #fff;
  text-align: center;
  padding: 64px 24px;
  position: relative;
}
.cta::before {
  content: '';
  position: absolute; inset: 0;
  background-image: linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 40px 40px;
  opacity: 0.5;
  pointer-events: none;
}
.cta h2 { color: #fff; font-size: clamp(1.75rem, 3vw, 2.5rem); position: relative; }
.cta p { color: rgba(255,255,255,0.75); margin: 16px 0 24px; position: relative; }
.cta .btn { position: relative; }

/* ---------- Feature icons ---------- */
.feature {
  background: #fff;
  border: 1px solid var(--border);
  padding: 28px;
  box-shadow: var(--shadow-card);
  transition: box-shadow .3s, border-color .3s;
}
.feature:hover { box-shadow: var(--shadow-gold); border-color: var(--gold); }
.icon-badge {
  width: 48px; height: 48px;
  background: linear-gradient(135deg, var(--navy) 0%, var(--royal) 100%);
  color: var(--gold);
  display: flex; align-items: center; justify-content: center;
  font-weight: 700;
  margin-bottom: 16px;
  font-size: 1.4rem;
}
.feature h3 { font-size: 1.1rem; }
.feature p { color: var(--muted); font-size: 0.95rem; margin: 8px 0 0; }

/* ---------- About / commitments ---------- */
.commitment-list {
  list-style: none;
  padding: 0;
  margin: 40px 0 0;
  display: grid;
  gap: 20px;
}
@media (min-width: 768px) { .commitment-list { grid-template-columns: 1fr 1fr; } }
.commitment-list li {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  padding: 20px;
  display: flex;
  gap: 12px;
  align-items: flex-start;
}
.check {
  width: 22px; height: 22px;
  border: 2px solid var(--gold);
  color: var(--gold);
  display: inline-flex; align-items: center; justify-content: center;
  font-weight: bold;
  flex-shrink: 0;
  margin-top: 2px;
}
.chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
}
.chip {
  background: #fff;
  border: 1px solid var(--border);
  padding: 12px 20px;
  font-family: 'Oswald', 'Arial Narrow', Impact, sans-serif;
  font-weight: 700;
  color: var(--navy);
  font-size: 13px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  transition: border-color .2s;
}
.chip:hover { border-color: var(--gold); }

/* ---------- Certifications page ---------- */
.iso-card {
  display: flex;
  gap: 20px;
  padding: 24px;
  background: #fff;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-card);
  margin-bottom: 20px;
  transition: box-shadow .3s, border-color .3s;
}
.iso-card:hover { box-shadow: var(--shadow-gold); border-color: var(--gold); }
.bis-panel {
  background: var(--navy-deep);
  color: #fff;
  padding: 32px;
}
.bis-panel ul { list-style: none; padding: 0; margin: 0; }
.bis-panel li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 0;
  border-bottom: 1px solid rgba(255,255,255,0.1);
  font-family: 'Oswald', 'Arial Narrow', Impact, sans-serif;
  font-weight: 600;
  letter-spacing: 0.05em;
}
.bis-panel li:last-child { border-bottom: 0; }
.bis-panel li::before {
  content: '✓';
  color: var(--gold);
  font-weight: 700;
}

/* ---------- Infrastructure ---------- */
.machinery-figure {
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-card);
}
.machinery-figure img { width: 100%; height: 320px; object-fit: cover; transition: transform .5s; }
.machinery-figure:hover img { transform: scale(1.05); }
.machinery-figure figcaption {
  position: absolute;
  inset: auto 0 0 0;
  background: rgba(10,26,58,0.88);
  color: #fff;
  padding: 14px 20px;
  font-family: 'Oswald', 'Arial Narrow', Impact, sans-serif;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-size: 14px;
}

/* ---------- Contact ---------- */
.contact-grid {
  display: grid;
  gap: 32px;
}
@media (min-width: 1000px) {
  .contact-grid { grid-template-columns: 2fr 3fr; }
}
.contact-panel {
  background: var(--navy-deep);
  color: #fff;
  padding: 32px;
  box-shadow: var(--shadow-card);
}
.contact-panel h2 { color: #fff; }
.contact-panel ul { list-style: none; padding: 0; margin: 24px 0 0; }
.contact-panel li { display: flex; gap: 16px; margin-bottom: 20px; }
.contact-panel .label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: rgba(255,255,255,0.6);
  display: block;
  margin-bottom: 4px;
}
.contact-panel .val { font-weight: 600; color: #fff; }
.contact-panel a.val:hover { color: var(--gold); }
.contact-panel .icon {
  color: var(--gold);
  font-weight: 700;
  flex-shrink: 0;
  width: 22px;
}
.map-frame {
  border: 1px solid var(--border);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  margin-top: 20px;
  height: 260px;
}
.map-frame iframe { width: 100%; height: 100%; border: 0; }

form.enquiry {
  background: #fff;
  border: 1px solid var(--border);
  padding: 32px;
  box-shadow: var(--shadow-card);
  display: grid;
  gap: 16px;
}
@media (min-width: 700px) {
  form.enquiry { grid-template-columns: 1fr 1fr; }
  form.enquiry .full { grid-column: 1 / -1; }
}
form.enquiry label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--navy);
  font-weight: 600;
  display: block;
  margin-bottom: 6px;
}
form.enquiry input,
form.enquiry select,
form.enquiry textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border);
  background: #fafaf7;
  font-family: inherit;
  font-size: 15px;
  color: var(--navy);
  transition: border-color .2s, box-shadow .2s;
}
form.enquiry input:focus,
form.enquiry select:focus,
form.enquiry textarea:focus {
  outline: none;
  border-color: var(--gold);
  box-shadow: 0 0 0 3px rgba(201,168,76,0.15);
}
form.enquiry .submit-row {
  display: flex; flex-direction: column; gap: 12px;
  align-items: flex-start;
  grid-column: 1 / -1;
}
@media (min-width: 700px) {
  form.enquiry .submit-row { flex-direction: row; justify-content: space-between; align-items: center; }
}
.form-note { font-size: 13px; color: var(--muted); }
.form-success {
  background: #ecfdf5;
  color: #065f46;
  border: 1px solid #a7f3d0;
  padding: 16px;
  margin-top: 16px;
  grid-column: 1 / -1;
  display: none;
}
.form-success.show { display: block; }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--navy-deep);
  color: rgba(255,255,255,0.75);
  padding: 60px 0 30px;
}
.site-footer .grid { grid-template-columns: 1fr; gap: 32px; }
@media (min-width: 800px) { .site-footer .grid { grid-template-columns: 2fr 1fr 1.2fr; } }
.site-footer h4 {
  color: #fff;
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: 16px;
  font-family: 'Inter', sans-serif;
  font-weight: 600;
}
.site-footer .brand { color: #fff; }
.site-footer p, .site-footer li a { color: rgba(255,255,255,0.6); }
.site-footer li { list-style: none; padding: 4px 0; }
.site-footer li a:hover { color: var(--gold); }
.site-footer ul { padding: 0; margin: 0; }
.site-footer .cert-mini {
  display: flex; flex-wrap: wrap; gap: 8px;
}
.site-footer .cert-mini span {
  padding: 4px 10px;
  border: 1px solid rgba(255,255,255,0.15);
  color: rgba(255,255,255,0.7);
  font-size: 11px;
  letter-spacing: 0.08em;
}
.copyright {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 24px;
  margin-top: 40px;
  display: flex; flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  font-size: 13px;
  color: rgba(255,255,255,0.5);
}

/* ---------- Utility ---------- */
.center { text-align: center; }
.mt-6 { margin-top: 24px; }
.mt-8 { margin-top: 32px; }