/* ===========================================================
   Layout — container, grid, header, footer
=========================================================== */
.container{
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

section{ position: relative; }

/* ---------------- header ---------------- */
/* Fixed and transparent by default so it floats directly over the hero
   video with no reserved flow height (the hero fills the viewport from
   y=0). nav.js adds [data-scrolled] once the page has scrolled past the
   hero's top, at which point it becomes the site's normal solid light
   nav. Both states share one smooth transition -- no abrupt jump. */
.site-header{
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: transparent;
  backdrop-filter: blur(0px) saturate(120%);
  -webkit-backdrop-filter: blur(0px) saturate(120%);
  border-bottom: 1px solid transparent;
  transition: background var(--dur-med) var(--ease-precise),
              border-color var(--dur-med) var(--ease-precise),
              backdrop-filter var(--dur-med) var(--ease-precise);
}
.site-header[data-scrolled]{
  background: rgba(250, 249, 245, 0.86);
  backdrop-filter: blur(10px) saturate(140%);
  -webkit-backdrop-filter: blur(10px) saturate(140%);
  border-bottom-color: var(--color-line);
}

/* overlay state (unscrolled, floating over the dark hero video) --
   brand, links and controls switch to light-on-dark colors */
.site-header:not([data-scrolled]) .brand-mark{ color: var(--color-paper); }
.site-header:not([data-scrolled]) .brand-word{ color: var(--color-paper); }
.site-header:not([data-scrolled]) .brand-word em{ color: var(--color-paper-soft); }
.site-header:not([data-scrolled]) .primary-nav a{ color: var(--color-paper-soft); }
.site-header:not([data-scrolled]) .primary-nav a:hover{ color: var(--color-paper); }
.site-header:not([data-scrolled]) .primary-nav a::after{ background: var(--color-cyan); }
.site-header:not([data-scrolled]) .lang-switch{ color: var(--color-paper-faint); }
.site-header:not([data-scrolled]) .lang-switch span.is-active{ color: var(--color-paper); }
.site-header:not([data-scrolled]) .nav-toggle span{ background: var(--color-paper); }
.site-header .brand-mark,
.site-header .brand-word,
.site-header .brand-word em,
.site-header .primary-nav a,
.site-header .lang-switch,
.site-header .lang-switch span,
.site-header .nav-toggle span{
  transition: color var(--dur-med) var(--ease-precise), background var(--dur-med) var(--ease-precise);
}

.header-inner{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
  height: 76px;
}

.brand{
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  flex: 0 0 auto;
}
.brand-mark{ color: var(--color-navy); display: inline-flex; }
.brand-word{
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
  color: var(--color-ink);
}
.brand-word em{
  font-style: normal;
  font-weight: 500;
  color: var(--color-ink-soft);
  margin-left: 0.35em;
}

.primary-nav{ flex: 1 1 auto; display: flex; justify-content: center; }
.primary-nav ul{ display: flex; align-items: center; gap: clamp(1.1rem, 1.6vw, 2rem); }
.primary-nav a{
  font-size: 0.9rem;
  color: var(--color-ink-soft);
  position: relative;
  padding: 0.4rem 0;
  transition: color var(--dur-fast) var(--ease-precise);
}
.primary-nav a::after{
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 1px;
  background: var(--color-blue);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-fast) var(--ease-precise);
}
.primary-nav a:hover{ color: var(--color-ink); }
.primary-nav a:hover::after{ transform: scaleX(1); }

.header-actions{ display: flex; align-items: center; gap: var(--space-md); flex: 0 0 auto; }

.lang-switch{
  display: inline-flex;
  align-items: center;
  gap: 0.35em;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--color-ink-faint);
}
.lang-switch span{ transition: color var(--dur-fast) var(--ease-precise); }
.lang-switch span.is-active{ color: var(--color-ink); }
.lang-sep{ opacity: 0.5; }

.nav-toggle{
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px; height: 32px;
}
.nav-toggle span{
  display: block;
  width: 100%;
  height: 1.5px;
  background: var(--color-ink);
  transition: transform var(--dur-fast) var(--ease-precise), opacity var(--dur-fast) var(--ease-precise);
}
.nav-toggle[aria-expanded="true"] span:nth-child(1){ transform: translateY(6.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2){ opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3){ transform: translateY(-6.5px) rotate(-45deg); }

.mobile-nav{
  display: none;
  position: absolute;
  top: 76px; left: 0; right: 0;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-line);
  padding: var(--space-md) var(--gutter) var(--space-lg);
}
.mobile-nav ul{ display: flex; flex-direction: column; }
.mobile-nav a{
  display: block;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--color-line);
  font-size: 1.05rem;
}
.mobile-nav .btn{ margin-top: var(--space-md); width: 100%; text-align: center; }

@media (max-width: 900px){
  .primary-nav{ display: none; }
  .nav-toggle{ display: flex; }
  .site-header[data-nav-open] .mobile-nav{ display: block; }
  /* the RFQ CTA lives in the mobile menu instead — keeps the header
     from overflowing next to the language switch + hamburger */
  .header-actions > .btn-primary{ display: none; }
}

@media (max-width: 480px){
  .lang-switch{ font-size: 0.7rem; }
  .header-actions{ gap: var(--space-sm); }
}

@media (max-width: 360px){
  .header-inner{ gap: var(--space-sm); }
  .header-actions{ gap: 0.55rem; }
  .brand-word{ font-size: 0.92rem; }
  .brand-word em{ margin-left: 0.25em; }
}

/* ---------------- section rhythm ---------------- */
.section-head{ max-width: 620px; margin-bottom: var(--space-xl); }
.section-head h2{ margin-top: 0.5rem; }

/* ---------------- footer ---------------- */
.site-footer{
  background: var(--color-navy);
  color: var(--color-paper-soft);
  padding-top: var(--space-2xl);
}
.footer-inner{
  display: grid;
  grid-template-columns: 1.4fr 1fr auto;
  gap: var(--space-lg);
  align-items: start;
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid var(--color-line-dark);
}
.footer-brand .brand-word{ color: var(--color-paper); }
.footer-brand .brand-word em{ color: var(--color-paper-soft); }
.footer-brand p{
  margin-top: var(--space-sm);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-cyan);
}
.footer-contact{ display: flex; flex-direction: column; gap: 0.4rem; }
.footer-contact a{ color: var(--color-paper); }
.footer-contact a:hover{ color: var(--color-cyan); }
.footer-links{ display: flex; gap: var(--space-md); align-items: center; }
.footer-links a{
  color: var(--color-paper-soft);
  transition: color var(--dur-fast) var(--ease-precise);
}
.footer-links a:hover{ color: var(--color-cyan); }

.footer-legal{
  display: flex;
  justify-content: space-between;
  gap: var(--space-sm);
  padding-block: var(--space-md);
  font-size: 0.8rem;
  color: var(--color-paper-faint);
}

@media (max-width: 720px){
  .footer-inner{ grid-template-columns: 1fr; gap: var(--space-md); }
  .footer-legal{ flex-direction: column; text-align: center; }
}