.platform-pane{position:absolute;inset:0;z-index:5;display:flex;flex-direction:column;background:var(--bg-app)}.platform-head{display:flex;align-items:center;gap:var(--sp-3);padding:6px var(--sp-4);border-bottom:1px solid var(--border);background:var(--bg-header)}.platform-back{flex:none}.platform-title{font-weight:var(--fw-semibold);font-size:var(--fs-sm);letter-spacing:.03em}.platform-hint{margin-left:auto;font-size:var(--fs-xs);color:var(--text-muted)}.platform-clock{margin-left:auto}.platform-clock .rail-clock{font-size:var(--fs-xs);color:var(--text-muted);letter-spacing:.04em;font-variant-numeric:tabular-nums;white-space:nowrap}.platform-host{flex:1;min-height:0}