/* ====== Header / Nav ====== */
header {
  position: sticky;
  top: 0;
  background: rgba(255,255,255,.85);
  backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid #eee;
  z-index: 10;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  font-weight: 700;
  white-space: nowrap;
}

.nav a {
  padding: 10px 12px;
  border-radius: 12px;
}
.nav a:hover { background: #D4E0ED; }

/* Hide hamburger by default (desktop) */
.menu-toggle {
  display: none;
  background: transparent;
  border: 0;
  padding: 10px;
  border-radius: 12px;
}

/* Hamburger icon */
.menu-toggle .menu-box {
  display: inline-block;
  width: 24px;
  height: 2px;
  background: #1a1a1a;
  position: relative;
}
.menu-toggle .menu-box::before,
.menu-toggle .menu-box::after {
  content: "";
  position: absolute;
  left: 0; right: 0;
  height: 2px;
  background: #1a1a1a;
}
.menu-toggle .menu-box::before { top: -7px; }
.menu-toggle .menu-box::after { top: 7px; }

/* ===== MOBILE ONLY (<= 679px) ===== */
@media (max-width: 679px){
  .menu-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  header .nav { position: relative; min-height: 56px; }

  #primary-nav {
    position: absolute;
    top: 100%;
    left: 24px; right: 24px;
    display: none !important;
    flex-direction: column;
    gap: 8px;
    background: #fff;
    border: 1px solid #eee;
    border-radius: 12px;
    box-shadow: var(--shadow);
    padding: 10px;
    margin-top: 8px;
  }
  #primary-nav a { padding: 12px; border-radius: 8px; }
  #primary-nav a:hover { background: #D4E0ED; }

  #primary-nav.open { display: flex !important; }

}