/* ============================================================
   PerlitePro Design System — layout.css
   Header · Navigation · Footer · Hero · Grids · Sections
   ============================================================ */

/* ---- Utility Bar ---- */
.util-bar {
  height: var(--util-h);
  background: var(--c-forest-dark);
  color: rgba(255,255,255,.8);
  font-size: var(--text-xs);
  display: flex;
  align-items: center;
  z-index: 1001;
  position: relative;
}
.util-bar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.util-bar__contact {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}
.util-bar__contact a {
  color: rgba(255,255,255,.8);
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
}
.util-bar__contact a:hover { color: #fff; }
.util-bar__contact .ico { width: 14px; height: 14px; opacity: .9; }

/* Phone number — prominent red, extra large */
.util-bar__contact .phone-link {
  color: #FF3B30;
  font-size: 1.75rem;
  font-weight: 900;
  letter-spacing: 0.03em;
}
.util-bar__contact .phone-link:hover { color: #FF5E57; }
.util-bar__contact .phone-link .ico { width: 22px; height: 22px; color: #FF3B30; }

/* Language toggle in util bar */
.lang-toggle {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-xs);
  font-weight: 700;
}
.lang-toggle button {
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  color: rgba(255,255,255,.6);
  transition: all .2s;
}
.lang-toggle button.is-active,
.lang-toggle button:hover {
  color: #fff;
  background: rgba(255,255,255,.15);
}

/* ---- Header / Nav ---- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: #fff;
  height: var(--header-h);
  transition: box-shadow .3s;
}
.site-header.is-scrolled {
  box-shadow: var(--shadow-nav);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 800;
  font-size: var(--text-xl);
  color: var(--c-forest-dark) !important;
  text-decoration: none !important;
  letter-spacing: -0.02em;
}
.logo img { width: 36px; height: 36px; }
.logo .logo-en { font-size: var(--text-sm); color: var(--c-ink-muted); display: block; line-height: 1; }

/* Main nav */
.main-nav { display: flex; align-items: center; gap: var(--space-1); }
.main-nav > li { position: relative; }
.main-nav > li > a {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--c-charcoal);
  border-radius: var(--radius-sm);
  transition: all .2s;
  white-space: nowrap;
}
.main-nav > li > a:hover,
.main-nav > li > a[aria-current="page"] {
  color: var(--c-forest);
  background: var(--c-perlite);
}
/* Dropdown arrow */
.main-nav .dd-arrow {
  display: inline-block;
  width: 10px;
  height: 10px;
  transition: transform .2s;
}
.main-nav > li:hover .dd-arrow { transform: rotate(180deg); }

/* Dropdown */
.main-nav .dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 200px;
  background: #fff;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-hover);
  padding: var(--space-2);
  opacity: 0;
  visibility: hidden;
  transform: translateY(4px);
  transition: all .2s;
  z-index: 999;
}
.main-nav > li:hover .dropdown,
.main-nav > li:focus-within .dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.main-nav .dropdown a {
  display: block;
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  color: var(--c-charcoal);
  border-radius: var(--radius-sm);
}
.main-nav .dropdown a:hover { background: var(--c-perlite); color: var(--c-forest); }

/* CTA button in nav */
.nav-cta {
  margin-left: var(--space-4);
  white-space: nowrap;
}

/* ---- Hamburger ---- */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: 4px;
  z-index: 1002;
}
.hamburger span {
  display: block;
  width: 100%;
  height: 2.5px;
  background: var(--c-charcoal);
  border-radius: 2px;
  transition: all .3s;
}
.hamburger.is-open span:nth-child(1) { transform: translateY(7.5px) rotate(45deg); }
.hamburger.is-open span:nth-child(2) { opacity: 0; }
.hamburger.is-open span:nth-child(3) { transform: translateY(-7.5px) rotate(-45deg); }

/* ---- Mobile Nav Panel ---- */
.mobile-nav {
  position: fixed;
  inset: 0;
  background: #fff;
  z-index: 999;
  padding: calc(var(--header-h) + var(--space-8)) var(--space-6) var(--space-8);
  overflow-y: auto;
  opacity: 0;
  visibility: hidden;
  transition: all .3s;
}
.mobile-nav.is-open {
  opacity: 1;
  visibility: visible;
}
.mobile-nav a {
  display: block;
  padding: var(--space-3) 0;
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--c-charcoal);
  border-bottom: 1px solid var(--c-border);
}
.mobile-nav a:hover { color: var(--c-forest); }
.mobile-nav .nav-cta { margin: var(--space-6) 0 0; }
.mobile-nav .lang-toggle { margin-top: var(--space-6); }
.mobile-nav .lang-toggle button {
  color: var(--c-charcoal);
  border: 1px solid var(--c-border);
}
.mobile-nav .lang-toggle button.is-active {
  background: var(--c-forest);
  color: #fff;
  border-color: var(--c-forest);
}

/* ---- Scroll-lock body ---- */
body.no-scroll { overflow: hidden; }

/* ---- Footer ---- */
.site-footer {
  background: var(--c-forest-dark);
  color: rgba(255,255,255,.7);
  padding-block: var(--space-16) var(--space-8);
  font-size: var(--text-sm);
}
.site-footer a { color: rgba(255,255,255,.7); }
.site-footer a:hover { color: #fff; }
/* Footer phone number — red & prominent, extra large */
.site-footer a[href^="tel"] {
  color: #FF3B30;
  font-weight: 900;
  font-size: 1.5rem;
}
.site-footer a[href^="tel"]:hover { color: #FF5E57; }
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
  gap: var(--space-8);
}
.footer-col h4 {
  color: #fff;
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.04em;
  margin-bottom: var(--space-4);
}
.footer-col li { margin-bottom: var(--space-2); }
.footer-brand img { width: 40px; height: 40px; margin-bottom: var(--space-3); }
.footer-brand .brand-name {
  color: #fff;
  font-weight: 800;
  font-size: var(--text-lg);
  margin-bottom: var(--space-3);
}
.footer-bottom {
  margin-top: var(--space-10);
  padding-top: var(--space-6);
  border-top: 1px solid rgba(255,255,255,.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-4);
  font-size: var(--text-xs);
}

@media (max-width: 899px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}
@media (max-width: 599px) {
  .footer-grid { grid-template-columns: 1fr; }
}

/* ---- Hero ---- */
.hero {
  position: relative;
  min-height: 88vh;
  display: flex;
  align-items: center;
  background: var(--c-forest-dark);
  overflow: hidden;
}
.hero__bg {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(135deg, rgba(22,56,42,.88) 0%, rgba(30,77,59,.72) 50%, rgba(22,56,42,.85) 100%),
    url("../assets/images/hero-factory.webp") center/cover no-repeat;
}
.hero .container {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  align-items: center;
}
.hero__content { color: #fff; }
.hero__content .eyebrow { color: var(--c-ochre); }
.hero__content h1 {
  color: #fff;
  margin-bottom: var(--space-6);
}
.hero__content .lede {
  color: rgba(255,255,255,.75);
  font-size: var(--text-lg);
  max-width: 50ch;
  margin-bottom: var(--space-8);
}
.hero__actions {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

/* Hero spec card */
.hero__spec-card {
  background: rgba(255,255,255,.08);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255,255,255,.15);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  display: grid;
  gap: var(--space-6);
}
.hero__spec-card .spec-line {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding-bottom: var(--space-3);
  border-bottom: 1px solid rgba(255,255,255,.1);
}
.hero__spec-card .spec-label { color: rgba(255,255,255,.6); font-size: var(--text-sm); }
.hero__spec-card .spec-value { color: #fff; font-size: var(--text-2xl); font-weight: 800; font-variant-numeric: tabular-nums; }

@media (max-width: 899px) {
  .hero .container { grid-template-columns: 1fr; }
  .hero__spec-card { display: none; }
  .hero { min-height: auto; padding-block: var(--space-20) var(--space-16); }
}

/* ---- Stats Band ---- */
.stats-band {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--space-6);
  padding-block: var(--space-10);
}
@media (max-width: 899px) { .stats-band { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 599px) { .stats-band { grid-template-columns: repeat(2, 1fr); } }

/* ---- Section: Product Cards Grid ---- */
.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}
@media (max-width: 899px) { .product-grid { grid-template-columns: 1fr; } }

/* ---- Section: Applications Grid ---- */
.apps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}
@media (max-width: 899px) { .apps-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 599px) { .apps-grid { grid-template-columns: 1fr; } }

/* ---- Certifications Grid ---- */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
}
@media (max-width: 899px) { .cert-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 599px) { .cert-grid { grid-template-columns: 1fr; } }

/* ---- CTA Band ---- */
.cta-band {
  background: var(--c-forest);
  color: #fff;
  text-align: center;
  padding-block: var(--space-16);
}
.cta-band h2 { color: #fff; margin-bottom: var(--space-4); }
.cta-band .lede { color: rgba(255,255,255,.7); margin-inline: auto; margin-bottom: var(--space-8); }
.cta-band__actions {
  display: flex;
  gap: var(--space-4);
  justify-content: center;
  flex-wrap: wrap;
}

/* ---- Page Hero (inner pages) ---- */
.page-hero .container { max-width: 800px; }
.page-hero h1 { margin-bottom: var(--space-4); }

/* ---- Contact page two-column ---- */
.contact-layout {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: var(--space-10);
  align-items: start;
}
@media (max-width: 899px) { .contact-layout { grid-template-columns: 1fr; } }

/* ---- About timeline ---- */
.timeline {
  position: relative;
  padding-left: var(--space-8);
}
.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 2px;
  background: var(--c-border);
}
.timeline__item {
  position: relative;
  padding-bottom: var(--space-6);
}
.timeline__item::before {
  content: '';
  position: absolute;
  left: calc(var(--space-8) * -1 + 1px);
  top: 6px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--c-ochre);
  transform: translateX(-50%);
}
.timeline__year {
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--c-ochre);
  margin-bottom: var(--space-1);
}

/* ---- FAQ Accordion ---- */
.faq-list { display: grid; gap: var(--space-3); }
.faq-item { border: 1px solid var(--c-border); border-radius: var(--radius-md); overflow: hidden; }
.faq-q {
  width: 100%;
  text-align: left;
  padding: var(--space-4) var(--space-6);
  font-weight: 600;
  font-size: var(--text-sm);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-4);
  background: var(--c-card);
  transition: background .2s;
}
.faq-q:hover { background: var(--c-perlite); }
.faq-q::after {
  content: '+';
  font-size: var(--text-xl);
  color: var(--c-moss);
  font-weight: 400;
  transition: transform .3s;
}
.faq-item.is-open .faq-q::after { content: '−'; }
.faq-a {
  padding: 0 var(--space-6) var(--space-4);
  font-size: var(--text-sm);
  color: var(--c-ink-muted);
  display: none;
}
.faq-item.is-open .faq-a { display: block; }

/* ---- Download card grid ---- */
.dl-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
}
@media (max-width: 899px) { .dl-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 599px) { .dl-grid { grid-template-columns: 1fr; } }

/* ---- SDS safety summary table ---- */
.safety-summary {
  margin-top: var(--space-8);
}

/* ---- Floating Mobile Call Button ---- */
.mobile-fab {
  display: none;
  position: fixed;
  bottom: 24px;
  right: 20px;
  z-index: 998;
  flex-direction: column;
  gap: 12px;
}
.mobile-fab__btn {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px rgba(0,0,0,.25);
  transition: transform .2s, box-shadow .2s;
  color: #fff;
}
.mobile-fab__btn:active { transform: scale(.92); }
.mobile-fab__btn--call {
  background: var(--c-forest);
}
.mobile-fab__btn--call svg {
  width: 26px; height: 26px;
  animation: pulse-phone 2s ease-in-out infinite;
}
.mobile-fab__btn--email {
  background: var(--c-ochre);
}
.mobile-fab__btn--email svg { width: 24px; height: 24px; }
.mobile-fab__label {
  position: absolute;
  right: 64px;
  top: 50%;
  transform: translateY(-50%);
  background: var(--c-charcoal);
  color: #fff;
  font-size: var(--text-xs);
  font-weight: 700;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s;
}
.mobile-fab__btn:hover .mobile-fab__label,
.mobile-fab__btn:focus-visible .mobile-fab__label { opacity: 1; }

@keyframes pulse-phone {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.12); }
}

/* Mobile: hide desktop util bar phone text, show FAB */
@media (max-width: 899px) {
  .mobile-fab { display: flex; }
  .util-bar__contact span { display: none; }
  .util-bar__contact a { font-size: 0; }
  .util-bar__contact a .ico { width: 16px; height: 16px; }
  .util-bar { font-size: 0; }
}

/* Mobile tweaks for better touch targets */
@media (max-width: 599px) {
  .hero__actions { flex-direction: column; }
  .hero__actions .btn { width: 100%; justify-content: center; }
  .cta-band__actions { flex-direction: column; align-items: center; }
  .cta-band__actions .btn { width: 100%; max-width: 320px; justify-content: center; }
  .footer-bottom { flex-direction: column; text-align: center; }

  /* Larger tap targets on mobile */
  .main-nav a, .mobile-nav a { min-height: 44px; display: flex; align-items: center; }
  .btn { min-height: 48px; }
  .form-input, .form-select { height: 48px; }
}