/* ============================================
   工业蓝图导航系统
   ============================================ */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(5, 7, 12, 0.9);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  z-index: 2000;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.6);
}

.navbar::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: var(--blueprint-grid);
  background-size: 60px 60px;
  opacity: 0.25;
  pointer-events: none;
}

.navbar-container {
  position: relative;
  z-index: 2;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 40px;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 16px;
  height: 86px;
}

.navbar-logo {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  color: #fff;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: none;
  line-height: 1.1;
  margin-left: -20px;
}

.navbar-logo .brand-cn {
  font-size: 18px;
  letter-spacing: 1.5px;
}

.navbar-logo .brand-en {
  font-size: 12px;
  color: var(--color-text-muted);
  letter-spacing: 0.18em;
}

.navbar-menu {
  list-style: none;
  display: flex;
  gap: 16px;
  align-items: center;
  flex-wrap: nowrap;
  margin-left: auto;
}

.navbar-item {
  position: relative;
}

.navbar-link {
  color: var(--color-text-primary);
  font-weight: var(--font-weight-medium);
  text-transform: uppercase;
  letter-spacing: 0.6px;
  padding: 10px 6px;
  font-size: 14px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: color var(--transition-fast);
  white-space: nowrap;
}

.navbar-link::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 8px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-secondary), transparent);
  opacity: 0;
  transform: translateY(4px);
  transition: var(--transition-fast);
}

.navbar-link:hover::after,
.navbar-item.active .navbar-link::after {
  opacity: 1;
  transform: translateY(0);
}

.navbar-link:hover {
  color: var(--color-secondary);
}

/* 下拉菜单 */
.navbar-submenu {
  list-style: none;
  position: absolute;
  top: calc(100% + 18px);
  left: 50%;
  transform: translateX(-50%) scaleY(0.8);
  transform-origin: top;
  min-width: 230px;
  background: var(--color-panel);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  padding: 14px 0;
  box-shadow: var(--shadow-hard);
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-base);
}

.navbar-item:hover .navbar-submenu,
.navbar-item:focus-within .navbar-submenu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) scaleY(1);
}

.navbar-submenu li a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 24px;
  color: var(--color-text-muted);
  font-size: 14px;
  letter-spacing: 0.5px;
}

.navbar-submenu li a span {
  font-size: 12px;
  color: var(--color-secondary);
}

.navbar-submenu li a:hover {
  background: rgba(255, 255, 255, 0.05);
  color: #fff;
}

/* 工业指示灯 */
.navbar-status {
  display: flex;
  align-items: center;
  gap: 12px;
}

.status-light {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-secondary);
  box-shadow: 0 0 10px rgba(255, 107, 53, 0.8);
  animation: pulse 1.4s infinite;
}

@keyframes pulse {
  0% { opacity: 0.4; }
  50% { opacity: 1; }
  100% { opacity: 0.4; }
}

/* 汉堡按钮 */
.navbar-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  padding: 12px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-sm);
}

.navbar-toggle span {
  width: 26px;
  height: 2px;
  background: white;
  transition: var(--transition-fast);
}

.navbar-toggle.active span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.navbar-toggle.active span:nth-child(2) {
  opacity: 0;
}

.navbar-toggle.active span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* 响应式 */
@media (max-width: 1024px) {
  .navbar-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(5, 7, 12, 0.95);
    padding: 12px 18px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base);
  }

  .navbar-menu.active {
    max-height: 600px;
  }

  .navbar-submenu {
    position: static;
    transform: none;
    max-height: 0;
    overflow: hidden;
    opacity: 1;
    visibility: visible;
    background: rgba(255, 255, 255, 0.02);
    border: none;
    box-shadow: none;
  }

  .navbar-item.active .navbar-submenu {
    max-height: 400px;
  }

  .navbar-submenu li a {
    padding-left: 32px;
  }

  .navbar-toggle { display: flex; }
}