/* =====================================================
   VIS Networks — Header / Navigation styles
   (kept separate from the global stylesheet on purpose)
   ===================================================== */

.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--line);
  transition: box-shadow .3s ease;
}
.site-header.scrolled { box-shadow: 0 6px 24px rgba(20,20,43,.08); }

.nav {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo img { height: 40px; width: auto; }

.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-menu a.nav-link {
  position: relative;
  padding: 10px 16px;
  font-weight: 500;
  font-size: 0.96rem;
  color: var(--ink-soft);
  border-radius: 8px;
  transition: color .2s ease, background .2s ease;
}
.nav-menu a.nav-link:hover { color: var(--red); }
.nav-menu a.nav-link.active { color: var(--red); }
.nav-menu a.nav-link.active::after {
  content: "";
  position: absolute;
  left: 16px; right: 16px; bottom: 4px;
  height: 2px; border-radius: 2px;
  background: var(--red);
}

/* Dropdown (Products) */
.nav-dropdown { position: relative; }
.nav-dropdown > .nav-link { cursor: pointer; }
.nav-dropdown .dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  min-width: 200px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
  padding: 8px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: all .2s ease;
}
.nav-dropdown:hover .dropdown-menu { opacity: 1; visibility: visible; transform: none; }
.dropdown-menu a {
  display: block;
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 0.92rem;
  color: var(--ink-soft);
}
.dropdown-menu a:hover { background: var(--bg-soft); color: var(--red); }
.dropdown-menu a small { display: block; color: var(--muted); font-size: .76rem; }

.nav-cta { display: flex; align-items: center; gap: 14px; }
.nav-cta-mobile { display: none; }

/* Hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: 0;
  cursor: pointer;
  padding: 8px;
}
.nav-toggle span {
  width: 26px; height: 2px;
  background: var(--ink);
  border-radius: 2px;
  transition: transform .3s ease, opacity .3s ease;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 940px) {
  .nav { height: 64px; padding: 0 18px; }
  .nav-logo img { height: 34px; }
  .nav-toggle { display: flex; }
  .nav-menu {
    position: fixed;
    top: 64px; left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: #fff;
    border-bottom: 1px solid var(--line);
    padding: 8px 16px 20px;
    box-shadow: var(--shadow);
    max-height: calc(100dvh - 64px);
    overflow-y: auto;
    transform: translateY(-120%);
    transition: transform .35s ease;
  }
  .nav-menu.open { transform: none; }
  .nav-menu li { border-bottom: 1px solid var(--line); }
  .nav-menu li:last-child { border-bottom: 0; }
  .nav-menu a.nav-link { display: block; padding: 15px 10px; border-radius: 8px; color: var(--ink-soft); font-size: 1rem; }
  .nav-menu a.nav-link.active::after { display: none; }
  .nav-menu a.nav-link.active { background: var(--red-soft); }
  .nav-dropdown .dropdown-menu {
    position: static;
    opacity: 1; visibility: visible; transform: none;
    box-shadow: none; border: 0; padding: 0 0 8px 12px;
    min-width: 0;
  }
  .nav-dropdown .dropdown-menu a { padding: 11px 12px; }
  .nav-cta { display: none; }
  .nav-cta-mobile { display: block; margin-top: 14px; border-bottom: 0 !important; }
  .nav-cta-mobile .btn { width: 100%; justify-content: center; padding: 15px; }
}