/* nav.css — topbar、user chip、導覽列與 owner action bar
 * Split from product-mvp/styles.css on 2026-05-15.
 */
@layer base {
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.35rem;
  border-bottom: none;
  background: rgba(255, 255, 255, 0.82);
  box-shadow: var(--shadow-soft);
  position: sticky;
  top: 0;
  z-index: 1000;
  isolation: isolate;
}

/* 毛玻璃改掛內層偽元素：避免 .topbar 本體因 backdrop-filter 成為 fixed 子元素的
   containing block（否則 builder 手機版 .actions 底部浮列會被困在 topbar 盒內、
   反而蓋住 logo）。tint 仍由 .topbar 半透明背景提供，blur 結果逐像素等價。 */
.topbar::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  backdrop-filter: var(--glass-filter);
  -webkit-backdrop-filter: var(--glass-filter);
  pointer-events: none;
}

.topbar h1,
.topbar strong#topbar-title {
  margin: 0.1rem 0 0;
  font-size: 1.05rem;
  letter-spacing: 0.04em;
  font-weight: 400;
  font-family: var(--serif);
  display: block;
}

.topbar-brand {
  min-width: 0;
  background: none;
  border: none;
  padding: 0.3rem 0.5rem;
  margin: -0.3rem -0.5rem;
  border-radius: 10px;
  cursor: pointer;
  text-align: left;
  line-height: 1;
  transition: background 0.15s;
}
.topbar-brand:hover {
  background: rgba(41, 53, 88, 0.06);
}
.topbar-brand.is-app:hover::after {
  content: " ↩";
  font-size: 0.8rem;
  color: var(--muted);
  font-weight: 400;
}

.topbar p,
.topbar small {
  margin: 0;
  color: var(--muted);
}

.topbar small {
  font-weight: 400;
  letter-spacing: 0.1em;
  font-size: 0.6rem;
  color: var(--muted);
  font-family: var(--sans);
}

.user-chip {
  display: inline-flex;
  align-items: center;
  padding: 0.3rem 0.65rem;
  background: rgba(41, 53, 88, 0.07);
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: 0.01em;
  max-width: 120px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.topbar-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--touch-gap-min);
  flex: 1;
  justify-content: center;
}

.topbar-nav .btn.active {
  border-color: var(--client-primary);
  color: var(--client-primary);
  background: rgba(191, 63, 47, 0.08);
}

.workspace-mode-btn {
  border-color: rgba(15, 122, 90, 0.18);
  font-weight: 700;
}

.workspace-mode-btn--provider {
  background: rgba(26, 26, 26, 0.06);
}

.workspace-mode-btn--client {
  background: rgba(15, 122, 90, 0.08);
}

.workspace-mode-btn.active,
.nav-drawer-item.workspace-mode-btn--provider.active,
.nav-drawer-item.workspace-mode-btn--client.active {
  box-shadow: inset 0 0 0 1px rgba(15, 122, 90, 0.2);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--touch-gap-min);
  align-items: center;
  justify-content: flex-end;
}

}