/* Radix-tree tab. Base tokens + chrome (topbar, tabs, buttons, type system)
   come from style.css; only tree-specific structure lives here. Same card
   framing, spacing, radii, and type roles as the Sessions tab; session identity
   uses the shared palette so a session reads the same across both tabs. */
.viz-root {
  --sess-0: var(--s0); --sess-1: var(--s1); --sess-2: var(--s2);
  --sess-3: var(--s3); --sess-4: var(--s4); --sess-5: var(--s5);
  --shared: #0ca30c;   /* reused across ≥2 sessions */
  --evicted: #b9b7b0;  /* dropped from the pool */
}
@media (prefers-color-scheme: dark) { .viz-root { --evicted: #4a4a46; } }

/* one card: legend/stats head + tree body (mirrors the Sessions chat card) */
.panel { margin-top: 14px; background: var(--surface-1); border: 1px solid var(--hair);
  border-radius: 14px; box-shadow: var(--shadow); overflow: hidden; }
.toolbar { display: flex; justify-content: space-between; align-items: baseline; gap: 16px;
  flex-wrap: wrap; padding: 14px 16px; border-bottom: 1px solid var(--hair); }
.legend { display: flex; gap: 14px; flex-wrap: wrap; }
.legend span { display: inline-flex; align-items: center; gap: 6px; font-size: 12px; color: var(--ink-2); }
.legend i { width: 9px; height: 9px; border-radius: 3px; display: inline-block; }
.stats { display: flex; gap: 16px; flex-wrap: wrap; font-size: 12px; color: var(--muted); }
.stats b { color: var(--ink); font-weight: 650; }
.tree { padding: 14px 16px 22px; }

/* a run of merged blocks = one item (matches the Sessions turn card) */
.pill { --c: var(--muted); display: block; min-width: 0; cursor: pointer; margin: 10px 0;
  background: var(--plane); border: 1px solid var(--hair); border-left: 4px solid var(--c);
  border-radius: 12px; padding: 11px 13px; animation: fade .25s ease;
  transition: opacity .3s, border-color .2s; }
@keyframes fade { from { opacity: 0; } to { opacity: 1; } }
.pill:hover { border-color: var(--c); }
.pill.shared { background: color-mix(in oklab, var(--shared) 8%, var(--plane)); }
.pill.evicted { opacity: .5; border-style: dashed; }

.pill-head { display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; }
.who { font-size: 13px; font-weight: 600; color: var(--c); }
.pill.shared .who { color: var(--shared); }
.atype { font-size: 10px; font-weight: 600; letter-spacing: .05em; text-transform: uppercase;
  color: var(--muted); border: 1px solid var(--hair); border-radius: 6px; padding: 1px 6px; }
.count { font-size: 13px; font-weight: 650; font-variant-numeric: tabular-nums; }
.toks, .leaves { color: var(--muted); font-size: 12px; font-variant-numeric: tabular-nums; }
.leaves { margin-left: auto; }

.snippet { margin-top: 6px; color: var(--ink-2); font-size: 12px; line-height: 1.5;
  display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 2; overflow: hidden;
  font-family: ui-monospace, "SF Mono", Menlo, monospace; }
.stubnote { margin-top: 6px; background: none; border: none; padding: 0; cursor: pointer;
  color: var(--muted); font-size: 11px; text-align: left; }
.stubnote:hover { color: var(--ink-2); text-decoration: underline; }

/* divergence marker */
.diverge { display: flex; align-items: center; gap: 8px; color: var(--ink-2);
  font-size: 12px; margin: 12px 0 4px; }
.fork { font-size: 15px; color: var(--shared); font-weight: 700; }

/* collapsible branch: header + body with a connector rail */
.branch { margin: 2px 0; }
.branch-head { display: flex; align-items: baseline; gap: 8px; cursor: pointer;
  padding: 5px 6px; border-radius: 8px; user-select: none; }
.branch-head:hover { background: color-mix(in oklab, var(--c) 8%, transparent); }
.caret { color: var(--c); font-size: 11px; width: 12px; }
.btag { font-size: 13px; font-weight: 600; color: var(--c); }
.bmeta { color: var(--muted); font-size: 12px; font-variant-numeric: tabular-nums; }
.branch-body { margin-left: 12px; padding-left: 16px;
  border-left: 2px solid color-mix(in oklab, var(--c) 45%, var(--hair)); }
.branch.collapsed > .branch-body { display: none; }

/* detail: a full-height right side-sheet (not a floating corner box) */
.detail { position: fixed; top: 0; right: 0; height: 100vh; width: min(460px, 92vw);
  background: var(--surface-1); border-left: 1px solid var(--hair);
  box-shadow: -10px 0 40px rgba(11, 11, 11, .14); display: flex; flex-direction: column;
  z-index: 30; animation: sheet .2s ease; }
@keyframes sheet { from { transform: translateX(12px); opacity: 0; } to { transform: none; opacity: 1; } }
.detail[hidden] { display: none; }
.detail-head { display: flex; justify-content: space-between; align-items: center; gap: 12px;
  padding: 12px 16px; border-bottom: 1px solid var(--hair); font-weight: 600; font-size: 13px; }
.x { border: none; background: none; cursor: pointer; color: var(--muted); font-size: 15px; }
.detail-body { overflow: auto; padding: 12px 16px; display: flex; flex-direction: column; gap: 8px; }
.blk { border: 1px solid var(--hair); border-radius: 10px; padding: 8px 10px; }
.blk .h { font-family: ui-monospace, monospace; color: var(--muted); font-size: 11px; }
.blk .prev { margin-top: 4px; font-size: 12px; line-height: 1.5; white-space: pre-wrap;
  word-break: break-word; color: var(--ink); font-family: ui-monospace, "SF Mono", Menlo, monospace; }