/* ============================================================
   Meriltec — nav.css (v1)  Sticky header + mobile menu
   ============================================================ */

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(14px) saturate(1.4);
  -webkit-backdrop-filter: blur(14px) saturate(1.4);
  border-bottom: 1px solid transparent;
  transition: height .3s var(--ease), background .3s var(--ease), border-color .3s var(--ease), box-shadow .3s var(--ease);
}
.site-header.scrolled {
  height: 64px;
  background: rgba(255, 255, 255, 0.92);
  border-bottom-color: var(--line);
  box-shadow: 0 6px 24px rgba(13,23,34,.06);
}

/* ---- Transparent header over the homepage hero video/image ---- */
/* At the top of the homepage the header is a gradient scrim with light text,
   so the hero video reads as the navigation background. On scroll it returns
   to the solid white-glass state above. */
body.home .site-header:not(.scrolled) {
  background: linear-gradient(to bottom, rgba(8,15,23,.62), rgba(8,15,23,0));
  backdrop-filter: none; -webkit-backdrop-filter: none;
  border-bottom-color: transparent; box-shadow: none;
}
body.home .site-header:not(.scrolled) .brand__name { color: #fff; }
body.home .site-header:not(.scrolled) .brand__name span { color: var(--accent-bright); }
body.home .site-header:not(.scrolled) .brand__mark { background: #fff; }
body.home .site-header:not(.scrolled) .nav__links a { color: rgba(255,255,255,.86); }
body.home .site-header:not(.scrolled) .nav__links a:hover,
body.home .site-header:not(.scrolled) .nav__links a.active { color: #fff; }
body.home .site-header:not(.scrolled) .nav__phone { color: #fff; }
body.home .site-header:not(.scrolled) .nav__phone svg { color: var(--accent-bright); }
body.home .site-header:not(.scrolled) .lang { border-color: rgba(255,255,255,.45); }
body.home .site-header:not(.scrolled) .lang button { color: rgba(255,255,255,.78); }
body.home .site-header:not(.scrolled) .lang button.active { background: #fff; color: var(--ink); }
body.home .site-header:not(.scrolled) .hamburger span { background: #fff; }

.nav {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

/* ---- Logo ---- */
.brand { display: inline-flex; align-items: center; gap: 0.6rem; flex-shrink: 0; }
.brand__mark {
  width: 34px; height: 34px; border-radius: 7px;
  background: var(--ink);
  display: grid; place-items: center;
  position: relative;
  overflow: hidden;
}
.brand__mark::before {
  /* roofline chevron */
  content: "";
  position: absolute; inset: 0;
  background:
    linear-gradient(135deg, transparent 46%, var(--cta) 46%, var(--cta) 54%, transparent 54%),
    linear-gradient(45deg, transparent 46%, var(--accent) 46%, var(--accent) 54%, transparent 54%);
}
.brand__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.3rem;
  letter-spacing: -0.03em;
  color: var(--ink);
}
.brand__name span { color: var(--accent); }

/* ---- Desktop links ---- */
.nav__links { display: flex; align-items: center; gap: 0.35rem; }
.nav__links a {
  font-size: 0.93rem;
  font-weight: 500;
  color: var(--ink-soft);
  padding: 0.65rem 0.9rem;
  border-radius: 6px;
  position: relative;
  transition: color .2s var(--ease), background .2s var(--ease);
}
.nav__links a:hover { color: var(--ink); }
.nav__links a.active { color: var(--accent); }
.nav__links a.active::after {
  content: ""; position: absolute; left: 0.85rem; right: 0.85rem; bottom: 0.2rem; height: 2px;
  background: var(--cta); border-radius: 2px;
}

/* ---- Right cluster ---- */
.nav__actions { display: flex; align-items: center; gap: 1rem; flex-shrink: 0; }
.nav__phone {
  display: inline-flex; align-items: center; gap: 0.45rem;
  font-family: var(--font-mono); font-weight: 500; font-size: 0.88rem;
  color: var(--ink); letter-spacing: 0.01em;
}
.nav__phone svg { width: 1rem; height: 1rem; color: var(--accent); }
.nav__phone:hover { color: var(--accent); }

/* ---- Language toggle ---- */
.lang {
  display: inline-flex; align-items: center;
  font-family: var(--font-mono); font-size: 0.78rem; font-weight: 500;
  border: 1px solid var(--line-strong); border-radius: 6px; overflow: hidden;
}
.lang button { min-height: 40px; padding: 0 0.75rem; display: flex; align-items: center; color: var(--muted); transition: background .2s, color .2s; }
.lang button.active { background: var(--ink); color: #fff; }
.lang button:not(.active):hover { color: var(--ink); }

/* ---- Hamburger ---- */
.hamburger {
  display: none;
  width: 44px; height: 44px;
  position: relative; border-radius: 8px;
}
.hamburger span {
  position: absolute; left: 11px; right: 11px; height: 2px; background: var(--ink);
  border-radius: 2px; transition: transform .3s var(--ease), opacity .2s var(--ease);
}
.hamburger span:nth-child(1) { top: 15px; }
.hamburger span:nth-child(2) { top: 21px; }
.hamburger span:nth-child(3) { top: 27px; }
.hamburger.active span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ---- Mobile menu ---- */
.mobile-menu {
  position: fixed; inset: 0; z-index: 99;
  background: var(--bg-deep);
  color: var(--on-deep);
  padding: calc(var(--header-h) + 1.5rem) var(--gutter) 2rem;
  display: flex; flex-direction: column;
  transform: translateX(100%);
  transition: transform .42s var(--ease);
  overflow-y: auto;
}
.mobile-menu.active { transform: none; }
.mobile-menu a {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 2rem;
  letter-spacing: -0.02em;
  color: #fff;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--line-deep);
  display: flex; align-items: baseline; gap: 0.8rem;
}
.mobile-menu a .idx { font-family: var(--font-mono); font-size: 0.8rem; color: var(--accent-bright); font-weight: 500; }
.mobile-menu a.active { color: var(--accent-bright); }
.mobile-menu__foot { margin-top: auto; padding-top: 2rem; display: flex; flex-direction: column; gap: 1rem; }
.mobile-menu__foot .btn { justify-content: center; }
.mobile-menu__foot a.mm-contact { font-family: var(--font-mono); font-size: 1rem; border: none; padding: 0; color: var(--on-deep-soft); }

/* ---- Responsive ---- */
@media (max-width: 940px) {
  .nav__links { display: none; }
  .nav__phone { display: none; }
  .nav__actions > .btn--cta { display: none; }
  .hamburger { display: block; }
}
@media (min-width: 941px) {
  .mobile-menu { display: none; }
}

/* spacer so fixed header doesn't overlap content */
.header-spacer { height: var(--header-h); }