:root {
  --w-left: 260px;
  --gap: 12px;
  --br: 12px;
  --bd: #ececec;
  --brand: #18509f;
}

.vis-mega-menu * { box-sizing: border-box }

.vis-mega-menu body {
  margin: 0;
  font-family: system-ui, Segoe UI, Roboto, Arial, sans-serif;
  background: #fafafa;
  color: #111;
}

/* layout 2 cột */
.vis-mega-menu .block {
  max-width: 1200px;
  margin: 16px auto;
  display: grid;
  grid-template-columns: var(--w-left) 1fr;
  gap: 12px;
}

.vis-mega-menu .menu {
  background: #fff;
  border: 1px solid var(--bd);
  border-radius: var(--br);
  height: 378px;
  display: flex;
  flex-direction: column;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.12),
              0 2px 6px rgba(0, 0, 0, 0.08);
  overflow: hidden;
}

.vis-mega-menu .menu-item {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 0 14px;
  cursor: pointer;
}

.vis-mega-menu .menu-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.vis-mega-menu .menu-item:hover { background: #f8f8f8 }

.vis-mega-menu .icons {
  width: 22px;
  height: 22px;
  background-size: contain;
  background-repeat: no-repeat;
}

.vis-mega-menu .panel {
  position: fixed;
  top: 0;
  left: 0;
  width: 928px;
  display: none;
  background: #fff;
  border: 1px solid #eee;
  border-radius: var(--br);
  z-index: 1000;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.12),
              0 2px 6px rgba(0, 0, 0, 0.08);
  max-height: calc(100vh - 40px);
  overflow-y: auto;
}

.vis-mega-menu .panel.show { display: block }

.vis-mega-menu .panel .inner { padding: 18px 16px 24px }

.vis-mega-menu .grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.vis-mega-menu .grid span.title {
  margin: 0 0 14px;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.3px;
  display: block; /* để xuống dòng giống h4 */
}

.vis-mega-menu .grid a {
  display: block;
  font-size: 14px;
  line-height: 1.45;
  color: #333;
  text-decoration: none;
  margin-bottom: 13px;
}

.vis-mega-menu .grid a:last-child { margin-bottom: 0 }

.vis-mega-menu .grid a:hover { color: var(--brand) }

.vis-mega-menu .banner {
  height: 378px;
  background: #eee;
  border: 1px solid var(--bd);
  border-radius: var(--br);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.12),
              0 2px 6px rgba(0, 0, 0, 0.08);
}

/* mobile */
@media (max-width:900px) {
  .vis-mega-menu .block { grid-template-columns: 1fr }
  .vis-mega-menu .panel {
    position: static;
    width: auto;
    box-shadow: none;
    margin-top: 8px;
  }
  .vis-mega-menu .panel .inner { padding: 12px }
  .vis-mega-menu .grid { grid-template-columns: repeat(2, 1fr) }
}