.structure-label{position:absolute;z-index:2;border:1px solid #e0d8bf;border-radius:7px;background:#f7f3e8;color:#745f34;font-family:Georgia,'Microsoft YaHei',serif;line-height:1.2;white-space:nowrap;cursor:pointer}.structure-label.active{background:#e2ecd9;border-color:#70956a;color:#315f4d}.structure-label sup{font-size:.65em}.structure-highlight{position:absolute;pointer-events:none;z-index:1;background:rgba(111,164,118,.16);border-radius:3px}

.structure-play{position:absolute;z-index:2;display:grid;place-items:center;border:1px solid #c3d4bd;border-radius:50%;background:#eef4e8;padding:5px;cursor:pointer;color:#356c58}.structure-play svg{width:100%;height:100%;fill:none;stroke:currentColor;stroke-width:1.7}.structure-play.playing{background:#d6e7cc}.structure-highlight{border-radius:0}

/* Consistent hierarchy palette, shared by editor and reader. */
.structure-label[data-level="1"]{color:#75501f;background:#f6eddc;border-color:#dbc49e;font-weight:600}
.structure-label[data-level="2"]{color:#285d78;background:#eaf2f7;border-color:#bdd1df;font-weight:550}
.structure-label[data-level="3"]{color:#416846;background:#edf4e9;border-color:#c8d8bf}
.structure-label[data-level="4"]{color:#765981;background:#f3edf7;border-color:#d7c7e0}
.structure-label[data-level="5"]{color:#786059;background:#f5efeb;border-color:#dacec7}
.structure-label.active{outline:2px solid currentColor;outline-offset:1px;box-shadow:0 0 0 3px #ffffff99}