/**
 * Lightning Track — site header with hamburger (mobile ≤768px)
 * Requires: <header class="site-header">, .nav-bar, .nav-toggle, #site-nav.nav-links
 */

.site-header .nav-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  gap: 16px;
}

.site-header .nav-toggle {
  display: none;
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 2px solid rgba(232, 93, 4, 0.45);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.06);
  cursor: pointer;
  align-items: center;
  justify-content: center;
  transition: background 0.2s ease, border-color 0.2s ease;
}

.site-header .nav-toggle:hover {
  background: rgba(232, 93, 4, 0.15);
  border-color: #e85d04;
}

.site-header .nav-toggle:focus-visible {
  outline: 2px solid #e85d04;
  outline-offset: 2px;
}

.site-header .nav-toggle-bars {
  position: relative;
  display: block;
  width: 22px;
  height: 2px;
  background: #fff;
  border-radius: 1px;
}

.site-header .nav-toggle-bars::before,
.site-header .nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 22px;
  height: 2px;
  background: #fff;
  border-radius: 1px;
  transition: transform 0.25s ease, top 0.25s ease;
}

.site-header .nav-toggle-bars::before {
  top: -7px;
}

.site-header .nav-toggle-bars::after {
  top: 7px;
}

.site-header.nav-open .nav-toggle-bars {
  background: transparent;
}

.site-header.nav-open .nav-toggle-bars::before {
  top: 0;
  transform: rotate(45deg);
}

.site-header.nav-open .nav-toggle-bars::after {
  top: 0;
  transform: rotate(-45deg);
}

@media (max-width: 768px) {
  .site-header {
    position: sticky;
    z-index: 200;
  }

  .site-header .nav-bar {
    position: relative;
    flex-direction: row !important;
    flex-wrap: nowrap;
    justify-content: space-between !important;
    align-items: center;
    text-align: left;
    gap: 12px;
  }

  .site-header .nav-toggle {
    display: inline-flex;
  }

  .site-header .nav-links {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    flex-direction: column;
    gap: 0;
    padding: 8px 0 16px;
    margin: 0;
    background: rgba(26, 35, 50, 0.98);
    backdrop-filter: blur(10px);
    border-bottom: 2px solid rgba(232, 93, 4, 0.3);
    box-shadow: 0 12px 28px rgba(0, 0, 0, 0.35);
    z-index: 99;
  }

  .site-header .nav-links a {
    padding: 14px 20px;
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
  }

  .site-header .nav-links a:hover {
    transform: none;
  }

  .site-header.nav-open .nav-links {
    display: flex;
  }
}