TREK/client/src/styles/studio-head.css

/* ----------------- head band (StudioHeader.tsx) ----------------- *
 * The shape every TREK dialog head has: a tinted band, a raised tile, a small
 * line above the title and a round close button at the end. The band keeps the
 * glass of the old bar under its tint, so the journey still shows through.
 */
.trek-dash .st-head {
  /* Its own stacking context, above the rails: the panels below carry z-index 1,
     and without this the format menu would open behind them. */
  position: relative;
  z-index: 5;
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  padding-inline: 14px 16px;
  background:
    linear-gradient(
      color-mix(in srgb, var(--accent) 7%, transparent),
      color-mix(in srgb, var(--accent) 7%, transparent)
    ),
    var(--glass-bg);
  border-bottom: 1px solid var(--glass-border);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
}

/* The journey's cover, so it is always clear whose book this is. */
.trek-dash .st-head-tile {
  width: 44px;
  height: 44px;
  flex: none;
  overflow: hidden;
  border-radius: 13px;
  background: var(--surface);
  box-shadow: var(--sh-sm);
}
.trek-dash .st-head-tile img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.trek-dash .st-head-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
  flex: 1 1 auto;
}

/* The wordmark and the beta mark: what this screen is, quietly, above its name. */
.trek-dash .st-head-eyebrow {
  display: flex;
  align-items: center;
  gap: 7px;
  height: 17px;
  color: var(--ink-2);
}
.trek-dash .st-head-eyebrow svg {
  flex: none;
}

.trek-dash .st-head-title {
  margin: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--ink);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.25;
}

.trek-dash .st-head-sub {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
}

/* The format, as a chip that opens the format menu. */
.trek-dash .st-head-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 22px;
  padding-inline: 7px 8px;
  border-radius: 999px;
  background: var(--surface);
  box-shadow: var(--sh-xs);
  color: var(--ink-2);
  font-size: 11.5px;
  font-weight: 500;
  white-space: nowrap;
  transition:
    color 0.16s,
    box-shadow 0.16s;
}
.trek-dash .st-head-chip:hover {
  color: var(--ink);
  box-shadow: var(--sh-sm);
}
.trek-dash .st-head-chip:focus {
  outline: none;
}
.trek-dash .st-head-chip:focus-visible {
  box-shadow:
    0 0 0 2px var(--accent-soft),
    0 0 0 3px var(--accent);
}
.trek-dash .st-head-chip-shape {
  flex: none;
  border: 1.5px solid currentColor;
  border-radius: 2px;
  opacity: 0.7;
}
/* The chip sits on the left, so its menu opens towards the page, not off the window. */
.trek-dash .st-head-menu {
  inset-inline-start: 0;
  inset-inline-end: auto;
}

.trek-dash .st-head-tools {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: none;
  margin-inline-start: auto;
}

/* Tools that belong together share one raised group, like a segmented control. */
.trek-dash .st-head-group {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 3px;
  border-radius: 12px;
  background: var(--surface);
  box-shadow: var(--sh-xs);
}

.trek-dash .st-head-close {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  flex: none;
  margin-inline-start: 2px;
  border-radius: 999px;
  background: var(--surface);
  box-shadow: var(--sh-sm);
  color: var(--ink-3);
  transition: color 0.16s;
}
.trek-dash .st-head-close:hover {
  color: var(--ink);
}
.trek-dash .st-head-close:focus {
  outline: none;
}
.trek-dash .st-head-close:focus-visible {
  box-shadow:
    0 0 0 2px var(--accent-soft),
    0 0 0 3px var(--accent);
}

/* The book view moved to the zoom, where the page's view lives; on reads as pressed. */
.trek-dash .st-zoom button.is-on {
  background: color-mix(in oklch, var(--accent) 14%, transparent);
  color: var(--ink);
}