.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 14px;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  z-index: 10;
}

.brand { display: inline-flex; align-items: center; gap: 7px; font-weight: 700; font-size: 15px; letter-spacing: 0.3px; }
.brand-logo { width: 20px; height: 20px; display: block; }

.toolbar-actions { display: flex; align-items: center; gap: 6px; }

.tb-btn {
  font: inherit;
  font-size: 13px;
  background: var(--color-surface-alt);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 5px 11px;
  cursor: pointer;
  transition: background 0.12s, border-color 0.12s;
}
.tb-btn:hover { background: var(--color-header); border-color: var(--color-border-strong); }
.tb-btn:active { transform: translateY(1px); }

.tb-sep { width: 1px; height: 20px; background: var(--color-border); margin: 0 4px; }

.formula-bar {
  display: flex;
  align-items: stretch;
  gap: 8px;
  padding: 6px 14px;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.fb-ref {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 56px;
  padding: 0 8px;
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--color-text-muted);
}

.fb-input {
  flex: 1;
  font: inherit;
  font-family: var(--mono);
  font-size: 13px;
  padding: 5px 10px;
  background: var(--color-surface);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  outline: none;
}
.fb-input:focus { border-color: var(--color-accent); }

/* Hover-to-insert affordance */
.insert-btn {
  position: absolute;
  z-index: 25;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent);
  color: #fff;
  border: 2px solid var(--color-surface);
  border-radius: 50%;
  width: 18px;
  height: 18px;
  font-size: 13px;
  line-height: 1;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.1s;
  box-shadow: var(--shadow-sm);
}
.insert-btn.show { opacity: 1; }
.insert-btn:hover { filter: brightness(1.1); }

.context-menu {
  position: fixed;
  z-index: 50;
  margin: 0;
  padding: 4px;
  list-style: none;
  min-width: 170px;
  background: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  font-size: 13px;
}
.context-menu li {
  padding: 6px 10px;
  border-radius: 4px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  gap: 16px;
}
.context-menu li:hover { background: var(--color-accent-soft); }
.context-menu li.danger { color: var(--color-danger); }
.context-menu li.sep { padding: 0; margin: 4px 0; height: 1px; background: var(--color-border); pointer-events: none; }
.context-menu li .hint { color: var(--color-text-muted); font-size: 11px; }

.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 80;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.4);
}
.modal {
  background: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  padding: 20px;
  width: 320px;
  max-width: calc(100vw - 32px);
}
.modal h3 { margin: 0 0 8px; font-size: 15px; }
.modal p { margin: 0 0 18px; font-size: 13px; color: var(--color-text-muted); line-height: 1.5; }
.modal-actions { display: flex; justify-content: flex-end; gap: 8px; }
.modal-actions .tb-btn.primary {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
}
.modal-actions .tb-btn.primary:hover { filter: brightness(1.08); }

/* Sheet tabs (bottom, Excel-style). */
.sheet-tabs {
  display: flex;
  align-items: stretch;
  gap: 2px;
  padding: 4px 8px;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  overflow-x: auto;
  flex: 0 0 auto;
}
.sheet-tab {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  font-size: 12px;
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: 6px 6px 0 0;
  cursor: pointer;
  white-space: nowrap;
  color: var(--color-text-muted);
  user-select: none;
}
.sheet-tab:hover { background: var(--color-header); }
.sheet-tab.active {
  background: var(--color-surface);
  color: var(--color-text);
  border-bottom-color: var(--color-accent);
  border-bottom-width: 2px;
  font-weight: 600;
}
.sheet-close {
  border: none;
  background: transparent;
  color: var(--color-text-muted);
  font-size: 14px;
  line-height: 1;
  cursor: pointer;
  padding: 0 2px;
  border-radius: 3px;
}
.sheet-close:hover { background: var(--color-danger); color: #fff; }
.sheet-add {
  border: 1px solid var(--color-border);
  background: var(--color-surface-alt);
  color: var(--color-text-muted);
  font-size: 15px;
  line-height: 1;
  cursor: pointer;
  border-radius: 6px;
  padding: 0 10px;
}
.sheet-add:hover { background: var(--color-header); color: var(--color-text); }
.sheet-rename {
  font: inherit;
  font-size: 12px;
  width: 90px;
  border: 1px solid var(--color-accent);
  border-radius: 4px;
  padding: 2px 4px;
  background: var(--color-surface);
  color: var(--color-text);
  outline: none;
}

/* Formula autocomplete / hover popover. */
.ac-pop {
  position: fixed;
  z-index: 90;
  min-width: 240px;
  max-width: 360px;
  max-height: 260px;
  overflow-y: auto;
  background: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  padding: 4px;
  font-size: 12px;
}
.ac-preview {
  padding: 6px 8px;
  margin-bottom: 4px;
  border-radius: 4px;
  background: var(--color-accent-soft);
  color: var(--color-accent);
  font-family: var(--mono);
  font-size: 12px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.ac-item {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  align-items: baseline;
  padding: 5px 8px;
  border-radius: 4px;
  cursor: pointer;
}
.ac-item.sel { background: var(--color-accent-soft); }
.ac-item .ac-label { font-family: var(--mono); color: var(--color-text); }
.ac-item .ac-hint { color: var(--color-text-muted); font-size: 11px; text-align: right; }

/* Toolbar dropdown (View options). */
.tb-dropdown { position: relative; display: inline-block; }
.view-menu {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  z-index: 60;
  min-width: 200px;
  background: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  padding: 6px;
}
.view-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  border-radius: 4px;
  font-size: 13px;
  cursor: pointer;
}
.view-item:hover { background: var(--color-accent-soft); }
.view-item input { cursor: pointer; }