:root{--reading-font-size:19px}.reading-toolbar{display:flex;align-items:center;gap:6px;padding:8px 16px;background:#f7f7f7;border-bottom:1px solid #ebebeb;font-size:14px;color:#555;position:sticky;top:0;z-index:100}.toolbar-label{color:#999;font-size:13px;margin-right:2px;white-space:nowrap}.font-btn{height:30px;padding:0 10px;border:1px solid #d0d0d0;border-radius:6px;background:#fff;cursor:pointer;font-size:13px;color:#444;display:flex;align-items:center;justify-content:center;gap:4px;transition:background .15s,color .15s,border-color .15s;white-space:nowrap;flex-shrink:0}.font-btn:hover{background:#4b6f20;color:#fff;border-color:#4b6f20}.font-btn:disabled{opacity:.35;cursor:default;pointer-events:none}.font-btn .font-sign{font-size:15px;font-weight:700;line-height:1;opacity:.7}.night-btn{margin-left:auto;display:flex;align-items:center;gap:4px;background:#eef3e4;border:1px solid #c9d9a0;color:#4b6f20;cursor:pointer;font-size:14px;line-height:1;padding:5px 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