/*
 * Path: assets/css/navbar.css
 * 說明：上導覽列樣式，包含 LOGO、標題、選單按鈕與下拉導覽區塊。
 */

.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-topbar);
  height: var(--topbar-h);
  background: rgba(8, 17, 31, 0.82);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(14px);
}

.topbar__inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.topbar__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-width: 0;
}

.topbar__logo-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.topbar__logo-img {
  display: block;
  width: auto;
  height: 36px;
  object-fit: contain;
}

.topbar__title-wrap {
  min-width: 0;
}

.topbar__title {
  font-size: 16px;
  font-weight: var(--fw-bold);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.topbar__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.nav-btn {
  width: 40px;
  height: 40px;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  background: rgba(255,255,255,0.04);
  color: var(--color-text);
}

.nav-btn:active {
  transform: scale(0.97);
}

.nav-drawer {
  position: fixed;
  inset: var(--topbar-h) 0 auto 0;
  z-index: var(--z-drawer);
  background: rgba(9, 19, 33, 0.96);
  border-bottom: 1px solid var(--color-border);
  transform: translateY(-12px);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-base) var(--ease-standard),
              transform var(--dur-base) var(--ease-standard);
}

.nav-drawer.is-open {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

.nav-menu {
  padding: var(--space-3) 0;
}

.nav-menu a,
.nav-menu button {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: 14px 16px;
  background: transparent;
  border: 0;
  color: var(--color-text);
  text-align: left;
}

.nav-menu a + a,
.nav-menu button + button,
.nav-menu a + button,
.nav-menu button + a {
  border-top: 1px solid var(--color-divider);
}