/* ===== 大厅共享顶部导航栏 ===== */
.hall-top-nav {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
}
.hall-top-nav .nav-brand { display: flex; align-items: center; gap: 12px; text-decoration: none; }
.hall-top-nav .nav-brand .logo { width: 36px; height: 36px; display: flex; align-items: center; justify-content: center; }
.hall-top-nav .nav-brand .logo img { width: 32px; height: 32px; object-fit: contain; display: block; }
html.dark .hall-top-nav .nav-brand .logo img { filter: brightness(0) invert(1); }
.hall-top-nav .nav-brand .brand-name { font-size: 18px; font-weight: 800; color: var(--text); font-family: "宋体", "SimSun", serif; }
.hall-top-nav .nav-center { display: flex; gap: 8px; }
.hall-top-nav .nav-tab { padding: 8px 16px; border-radius: 8px; color: var(--muted); text-decoration: none; font-size: 14px; font-weight: 500; transition: all 0.2s; white-space: nowrap; }
.hall-top-nav .nav-tab:hover { background: rgba(26, 115, 232, .08); color: var(--text); }
.hall-top-nav .nav-user { display: flex; align-items: center; gap: 12px; }
.hall-top-nav .user-avatar { width: 36px; height: 36px; background: linear-gradient(135deg, #10b981, #059669); border-radius: 50%; display: flex; align-items: center; justify-content: center; color: white; font-weight: 600; font-size: 14px; }
.hall-top-nav .logout-btn { padding: 6px 12px; border: 1px solid var(--border); border-radius: 6px; color: var(--muted); background: transparent; font: inherit; font-size: 13px; text-decoration: none; transition: all 0.2s; cursor: pointer; }
.hall-top-nav .logout-btn:hover { border-color: #ef4444; color: #ef4444; }
.hall-top-nav .logout-form { margin: 0; }
.hall-top-nav .theme-toggle { background: var(--surface-elevated); border: 1px solid var(--border); width: 40px; height: 40px; border-radius: 50%; display: flex; align-items: center; justify-content: center; cursor: pointer; transition: all 0.3s ease; }
.hall-top-nav .theme-toggle:hover { transform: scale(1.05); }
.hall-top-nav .theme-icon { font-size: 18px; }

@media (max-width: 900px) {
  .hall-top-nav .nav-center { display: none; }
}
@media (max-width: 480px) {
  .hall-top-nav { padding: 0 14px; }
  .hall-top-nav .nav-brand .brand-name { display: none; }
}