/* ── App Layout ── */
#app {
  display: flex;
  flex-direction: column;
  height: 100%;
}

/* ── Header ── */
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  height: 60px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

header h1 {
  font-size: 18px;
  white-space: nowrap;
}

.header-left, .header-center, .header-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.header-center { gap: 4px; }

.header-divider {
  width: 1px;
  height: 24px;
  background: var(--border);
  margin: 0 4px;
}

.assignee-toggle {
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: transparent;
  color: var(--text2);
  cursor: pointer;
  font-size: 12px;
  font-weight: 500;
  transition: all .2s;
}

.assignee-toggle:hover {
  color: var(--text);
  border-color: var(--border2);
}

.assignee-toggle.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.user-select {
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text);
  font-size: 13px;
  cursor: default;
  outline: none;
  opacity: 0.8;
}