/* 最后修改：2026-09-24 16:41:56（北京时间）— 播放中右上控制，结束后居中控制。 */
*{box-sizing:border-box}[hidden]{display:none!important}body{margin:0;background:#f3f2ef;color:#17202d;font:15px/1.5 'MiSans VF','Noto Sans SC','PingFang SC','Microsoft YaHei',Arial,sans-serif;height:100dvh;overflow:hidden;display:flex;flex-direction:column}#stage{position:relative;width:100%;flex:1;min-height:0;overflow:hidden}#player{position:absolute;left:50%;top:50%;transform-origin:0 0;pointer-events:none}.replayer-wrapper{position:relative}.replayer-wrapper iframe{border:0;display:block}.replayer-mouse,.replayer-mouse-tail{display:none!important}#loading{position:absolute;inset:0;display:grid;place-items:center;background:#f3f2ef}#controls{flex:none;display:flex;align-items:center;justify-content:space-between;gap:24px;min-height:84px;padding:16px 28px;background:#171b22;color:#fff}#lesson-title{font-size:24px;font-weight:700;line-height:1.4;margin:0}.control-actions{display:flex;align-items:center;gap:12px;flex:none}#controls button,#controls a{font-size:18px;min-height:48px;padding:10px 22px}button,a{font:inherit;display:inline-block;padding:8px 16px;border:1px solid #7b8593;border-radius:6px;color:#fff;background:#252b35;text-decoration:none;cursor:pointer}button:hover,a:hover{background:#3a4350}button:disabled{opacity:.4;cursor:default}button:focus-visible,a:focus-visible{outline:2px solid #919ead;outline-offset:3px}#ending{position:absolute;inset:0;display:grid;place-items:center;background:#f3f2ef;text-align:center}#ending h1{font-size:30px;margin:0 0 26px}#ending button,#ending a{margin:0 6px}#ending a{background:#fff;color:#20262e;border-color:#cdd3dc}#ending a:hover{background:#e7e9ed}