/* 顶部网站标题栏样式 */
.topbar {
  position: sticky;
  top: 0;
  z-index: 2000; /* 保证位于抽屉与遮罩之上 */
  height: 56px;
  display: grid;
  grid-template-columns: 56px 1fr 56px;
  align-items: center;
  background: linear-gradient(180deg, rgba(0,0,0,0.25) 0%, rgba(0,0,0,0.35) 100%);
  border-bottom: 1px solid rgba(255,255,255,0.08);
  backdrop-filter: blur(4px);
}

.topbar-title {
  text-align: center;
  font-size: 18px;
  font-weight: 600;
  font-style: italic;
  letter-spacing: 1px;
  color: #e5e7eb;
}

.topbar-left,
.topbar-right {
  display: flex;
  align-items: center;
  justify-content: center;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,0.12);
  background: rgba(255,255,255,0.04);
  color: #93c5fd; /* 主题蓝 */
}
.icon-btn:hover { background: rgba(255,255,255,0.08); }

@media (min-width: 768px) {
  .topbar { grid-template-columns: 56px 1fr 56px; }
}