@layer business {
/* session tab 栏 */
.browser-session-tabs {
  display: flex;
  align-items: center;
  height: 32px;
  padding: 0 8px;
  gap: 4px;
  border-bottom: 1px solid var(--ruled-line-color);
  background: var(--bg-panel);
  flex-shrink: 0;
  overflow-x: auto;
}

.browser-session-tab {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 0 10px;
  height: 24px;
  border-radius: 3px;
  cursor: pointer;
  font-size: 0.75rem;
  color: var(--text-muted);
  white-space: nowrap;
  border: 1px solid transparent;
}

.browser-session-tab:hover { background: rgba(139, 119, 90, 0.1); color: var(--text-main); }
.browser-session-tab.active { background: var(--bg-void); color: var(--color-primary); border-color: var(--ruled-line-color); }

.session-tab-close {
  width: 14px; height: 14px; border-radius: 50%; font-size: 0.7rem;
  display: flex; align-items: center; justify-content: center;
  color: var(--text-muted); cursor: pointer;
}
.session-tab-close:hover { background: rgba(220, 38, 38, 0.15); color: var(--file-color-pdf); }

/* page tab 栏 */
.browser-page-tabs {
  display: flex;
  align-items: center;
  height: 28px;
  padding: 0 8px;
  gap: 2px;
  border-bottom: 1px solid var(--ruled-line-color);
  background: var(--bg-void);
  flex-shrink: 0;
  overflow-x: auto;
}

.browser-page-tab {
  display: flex; align-items: center; gap: 4px;
  padding: 0 8px; height: 22px; border-radius: 3px;
  cursor: pointer; font-size: 0.72rem; color: var(--text-muted); white-space: nowrap;
}
.browser-page-tab:hover { background: rgba(139, 119, 90, 0.1); }
.browser-page-tab.active { color: var(--color-primary); font-weight: 600; }

.page-tab-close {
  width: 12px; height: 12px; border-radius: 50%; font-size: 0.65rem;
  display: flex; align-items: center; justify-content: center; color: var(--text-muted);
}
.page-tab-close:hover { background: rgba(220, 38, 38, 0.15); color: var(--file-color-pdf); }

.browser-new-page-btn {
  padding: 0 8px; height: 22px; border-radius: 3px;
  font-size: 1rem; color: var(--text-muted); cursor: pointer;
  line-height: 1;
}
.browser-new-page-btn:hover { background: rgba(139, 119, 90, 0.1); color: var(--text-main); }

/* 地址栏 */
.browser-toolbar {
  display: flex; align-items: center; gap: 4px;
  padding: 4px 8px; border-bottom: 1px solid var(--ruled-line-color);
  background: var(--bg-panel); flex-shrink: 0;
}

.browser-nav-btn {
  width: 26px; height: 26px; border-radius: 4px;
  display: flex; align-items: center; justify-content: center;
  color: var(--text-muted); cursor: pointer; font-size: 1rem;
}
.browser-nav-btn:hover { background: rgba(139, 119, 90, 0.1); color: var(--text-main); }
.browser-nav-btn:disabled { opacity: 0.3; cursor: not-allowed; }

.browser-url-input {
  flex: 1; height: 26px; padding: 0 10px;
  background: var(--bg-void); border: 1px solid var(--ruled-line-color);
  border-radius: 4px; font-family: var(--font-mono); font-size: 0.8rem;
  color: var(--text-main);
}
.browser-url-input:focus-visible { outline: none; border-color: var(--color-primary); }

/* browser content 区域（WebContentsView 叠加占位） */
#browser-content {
  flex: 1;
  min-height: 0;
}

}