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.vjs-volume-level{background-color:#1e62ec}.fish-popover{-webkit-box-sizing:border-box;box-sizing:border-box;margin:0;padding:0;color:rgba(0,0,0,.85);font-size:14px;font-variant:tabular-nums;line-height:1.5;list-style:none;-webkit-font-feature-settings:"tnum";font-feature-settings:"tnum";position:absolute;top:0;left:0;z-index:1030;font-weight:400;white-space:normal;text-align:left;cursor:auto;-webkit-user-select:text;-moz-user-select:text;-ms-user-select:text;user-select:text}.fish-popover:after{position:absolute;background:hsla(0,0%,100%,.01);content:""}.fish-popover-hidden{display:none}.fish-popover-placement-top,.fish-popover-placement-topLeft,.fish-popover-placement-topRight{padding-bottom:10px}.fish-popover-placement-right,.fish-popover-placement-rightBottom,.fish-popover-placement-rightTop{padding-left:10px}.fish-popover-placement-bottom,.fish-popover-placement-bottomLeft,.fish-popover-placement-bottomRight{padding-top:10px}.fish-popover-placement-left,.fish-popover-placement-leftBottom,.fish-popover-placement-leftTop{padding-right:10px}.fish-popover-inner{background-color:#fff;background-clip:padding-box;border-radius:4px;-webkit-box-shadow:0 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rotate(45deg)}.fish-popover-placement-bottomLeft>.fish-popover-content>.fish-popover-arrow{left:16px}.fish-popover-placement-bottomRight>.fish-popover-content>.fish-popover-arrow{right:16px}.fish-popover-placement-left>.fish-popover-content>.fish-popover-arrow,.fish-popover-placement-leftBottom>.fish-popover-content>.fish-popover-arrow,.fish-popover-placement-leftTop>.fish-popover-content>.fish-popover-arrow{right:6px;border-top-color:#fff;border-right-color:#fff;border-bottom-color:transparent;border-left-color:transparent;-webkit-box-shadow:3px -3px 7px rgba(0,0,0,.07);box-shadow:3px -3px 7px rgba(0,0,0,.07)}.fish-popover-placement-left>.fish-popover-content>.fish-popover-arrow{top:50%;-webkit-transform:translateY(-50%) rotate(45deg);-ms-transform:translateY(-50%) rotate(45deg);transform:translateY(-50%) rotate(45deg)}.fish-popover-placement-leftTop>.fish-popover-content>.fish-popover-arrow{top:12px}.fish-popover-placement-leftBottom>.fish-popover-content>.fish-popover-arrow{bottom:12px}[dir=rtl] .fish-popover{right:auto}[dir=rtl] .fish-popover-placement-left,[dir=rtl] .fish-popover-placement-leftBottom,[dir=rtl] .fish-popover-placement-leftTop{padding-right:10px;padding-left:0}[dir=rtl] .fish-popover-placement-left>.fish-popover-content>.fish-popover-arrow,[dir=rtl] .fish-popover-placement-leftBottom>.fish-popover-content>.fish-popover-arrow,[dir=rtl] .fish-popover-placement-leftTop>.fish-popover-content>.fish-popover-arrow{right:6px;left:auto;-webkit-transform:rotate(135deg);-ms-transform:rotate(135deg);transform:rotate(135deg)}[dir=rtl] .fish-popover-placement-right,[dir=rtl] .fish-popover-placement-rightBottom,[dir=rtl] .fish-popover-placement-rightTop{padding-right:0;padding-left:10px}[dir=rtl] .fish-popover-placement-right>.fish-popover-content>.fish-popover-arrow,[dir=rtl] 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1.5rem;font-size:1.4rem;color:#888}.fm-list-body{position:relative;background-color:#fff;border-top:.1rem solid #ddd;border-bottom:.1rem solid #ddd}@media (-webkit-min-device-pixel-ratio:2),(min-resolution:2dppx){html:not([data-scale]) .fm-list-body{border-top:none}html:not([data-scale]) .fm-list-body:before{content:"";position:absolute;background-color:#ddd;display:block;z-index:1;top:0;right:auto;bottom:auto;left:0;width:100%;height:.1rem;transform-origin:50% 50%;transform:scaleY(.5)}}@media (-webkit-min-device-pixel-ratio:2) and (-webkit-min-device-pixel-ratio:3),(min-resolution:2dppx) and (min-resolution:3dppx){html:not([data-scale]) .fm-list-body:before{transform:scaleY(.33)}}@media (-webkit-min-device-pixel-ratio:2),(min-resolution:2dppx){html:not([data-scale]) .fm-list-body{border-bottom:none}html:not([data-scale]) 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and (min-resolution:3dppx){html:not([data-scale]) .fm-list-body div:not(:last-child) .fm-list-line:after{transform:scaleY(.33)}}.fm-list-item{position:relative;display:flex;padding-left:1.5rem;min-height:4.4rem;background-color:#fff;vertical-align:middle;overflow:hidden;transition:background-color .2s;align-items:center}.fm-list-item.fm-list-item-top .fm-list-line{align-items:flex-start}.fm-list-item.fm-list-item-top .fm-list-line .fm-list-arrow{margin-top:.2rem}.fm-list-item.fm-list-item-middle .fm-list-line{align-items:center}.fm-list-item.fm-list-item-bottom .fm-list-line{align-items:flex-end}.fm-list-item.fm-list-item-active{background-color:#ddd}.fm-list-item img{width:2.2rem;height:2.2rem;vertical-align:middle}.fm-list-item .fm-list-thumb{font-size:2.4rem}.fm-list-item .fm-list-thumb:first-child{margin-right:1.5rem}.fm-list-item .fm-list-thumb:last-child{margin-left:.8rem}.fm-list-item .fm-list-line{position:relative;display:flex;flex:1;align-self:stretch;padding-right:1.5rem;overflow:hidden}.fm-list-item .fm-list-line .fm-list-label{flex:1;color:#000;font-size:1.7rem;text-align:left}.fm-list-item .fm-list-line .fm-list-content,.fm-list-item .fm-list-line .fm-list-label{line-height:1.5;width:auto;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;padding-top:.7rem;padding-bottom:.7rem}.fm-list-item .fm-list-line .fm-list-content{flex-basis:36%;color:#888;font-size:1.6rem;text-align:right}.fm-list-item .fm-list-line .fm-list-brief,.fm-list-item .fm-list-line .fm-list-title{width:auto;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.fm-list-item .fm-list-line .fm-list-brief{color:#888;font-size:1.5rem;line-height:1.5;margin-top:.6rem}.fm-list-item .fm-list-line .fm-list-arrow-wrap{position:relative;width:1.5rem;height:100%}.fm-list-item .fm-list-line .fm-list-arrow{position:absolute;top:50%;transform:translateY(-50%);display:block;width:100%;height:1.5rem;margin-left:.8rem;background-image:url("data:image/svg+xml;charset=utf-8,%3Csvg width='16' height='26' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M2 0 0 2l11.5 11L0 24l2 2 14-13z' fill='%23C7C7CC' fill-rule='evenodd'/%3E%3C/svg%3E");background-size:contain;background-repeat:no-repeat;background-position:50% 50%;visibility:hidden}.fm-list-item .fm-list-line .fm-list-arrow-horizontal{visibility:visible}.fm-list-item .fm-list-line .fm-list-arrow-vertical{visibility:visible;transform:rotate(90deg)}.fm-list-item .fm-list-line .fm-list-arrow-vertical-up{visibility:visible;transform:rotate(270deg)}.fm-list-item .fm-list-line-multiple{padding:1.25rem 1.5rem 1.25rem 0}.fm-list-item .fm-list-line-multiple .fm-list-content,.fm-list-item .fm-list-line-multiple .fm-list-label{padding-top:0;padding-bottom:0}.fm-list-item .fm-list-line-wrap .fm-list-content,.fm-list-item .fm-list-line-wrap .fm-list-label{white-space:normal}.fm-list-item select{position:relative;display:block;width:100%;height:100%;padding:0;border:0;font-size:1.7rem;-webkit-appearance:none;appearance:none;background-color:transparent}.fm-list-form-item .fm-list-label{flex:none}.fm-list-form-item .fm-list-content{flex:1}@keyframes ripple{to{opacity:0;transform:scale(2.5)}}.fm-toast{position:fixed;width:100%;z-index:1999;font-size:1.4rem;text-align:center}.fm-toast>span{max-width:50%}.fm-toast.fm-toast-mask{height:100%;display:flex;justify-content:center;align-items:center;left:0;top:0;transform:translateZ(.1rem)}.fm-toast.fm-toast-nomask{position:fixed;max-width:50%;width:auto;left:50%;top:50%;transform:translateZ(.1rem)}.fm-toast.fm-toast-nomask .fm-toast-notice{transform:translateX(-50%) translateY(-50%)}.fm-toast-notice-content .fm-toast-text{min-width:6rem;border-radius:.3rem;color:#fff;background-color:rgba(58,58,58,.9);line-height:1.5;padding:.9rem 1.5rem}.fm-toast-notice-content .fm-toast-text.fm-toast-text-icon{border-radius:.5rem;padding:1.5rem 1.5rem}.fm-toast-notice-content .fm-toast-text.fm-toast-text-icon .fm-toast-text-icon-lg{font-size:3.6rem}.fm-toast-notice-content .fm-toast-text.fm-toast-text-icon .fm-toast-text-info{margin-top:.6rem}.fm-radio-group{line-height:unset;display:flex;flex-direction:column}.fm-radio{display:inline-block;position:relative;vertical-align:middle;width:1.5rem;height:1.5rem}.fm-radio-focused .fm-radio-inner{border-color:#108ee9}.fm-radio-inner{position:absolute;right:0;width:1.5rem;height:1.5rem;box-sizing:border-box;transform:rotate(0deg)}.fm-radio-inner:after{position:absolute;display:none;top:-.2rem;right:.7rem;z-index:999;width:.7rem;height:1.4rem;border-style:solid;border-width:0 .15rem .15rem 0;content:"\0020";transform:rotate(45deg)}.fm-radio-input{position:absolute;top:0;right:0;bottom:0;z-index:1;width:100%;height:100%;opacity:0}.fm-radio-checked .fm-radio-inner:after{display:block;border-color:#108ee9}.fm-radio-disabled .fm-radio-inner:after{border-color:rgba(0,0,0,.2)}.fm-list .fm-list-item.fm-radio-item .fm-list-content{width:2.1rem;height:2.1rem}.fm-list .fm-list-item.fm-radio-item .fm-list-content .fm-radio{position:absolute;top:0;left:0;right:0;bottom:0;width:100%;height:4.4rem}.fm-list .fm-list-item.fm-radio-item .fm-list-content .fm-radio-inner{position:absolute;display:inline-block;right:1.5rem;top:1.2rem}.fm-list .fm-list-item.fm-radio-item.fm-radio-item-disabled 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.fish-btn.diff-unselected{border-color:#b7ccf9;color:#fff;background-color:#b7ccf9}.diff-mobile-popup .diff-list .fm-list-footer .footer-btns .fish-btn.diff-unselected:active,.diff-mobile-popup .diff-list .fm-list-footer .footer-btns .fish-btn.diff-unselected:hover{color:#fff;background-color:#b7ccf9}.diff-mobile-popup .diff-list .fm-list-footer .footer-btns .fish-btn+.fish-btn{margin-left:16px}.diff-mobile-popup .diff-radio{padding-left:16px}.diff-mobile-popup .diff-radio .fm-list-line{padding-right:16px;border-bottom:none!important}.diff-mobile-popup .diff-radio .fm-list-line .fm-list-label{font-size:14px;line-height:22px;padding:10px 0}.diff-mobile-popup .diff-radio .fm-radio-checked .fm-radio-inner:after{display:block;border-color:#1e62ec}.diff-mobile-popup .diff-radio.very-simple .fm-list-label{color:var(--q-verysimple-text-color)}.diff-mobile-popup .diff-radio.simple .fm-list-label{color:var(--q-simple-text-color)}.diff-mobile-popup .diff-radio.normal .fm-list-label{color:var(--q-normal-text-color)}.diff-mobile-popup .diff-radio.bit-hard .fm-list-label{color:var(--q-bithard-text-color)}.diff-mobile-popup .diff-radio.hard .fm-list-label{color:var(--q-hard-text-color)}.qti-player ._question-difficulty{display:inline-block;margin-left:8px;padding:0 8px;font-size:12px;line-height:24px;vertical-align:top;border-radius:4px}.qti-player ._question-difficulty.very-simple{color:var(--q-verysimple-text-color);background-color:var(--q-verysimple-bg-color)}.qti-player ._question-difficulty.simple{color:var(--q-simple-text-color);background-color:var(--q-simple-bg-color)}.qti-player ._question-difficulty.normal{color:var(--q-normal-text-color);background-color:var(--q-normal-bg-color)}.qti-player ._question-difficulty.bit-hard{color:var(--q-bithard-text-color);background-color:var(--q-bithard-bg-color)}.qti-player 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4px;color:#999;font-size:12px;margin-top:4px}.diff-feedback-container .diff-fb-btn span,.diff-feedback-container .diff-fb-btn:active span,.diff-feedback-container .diff-fb-btn:hover span{color:#999}.diff-feedback-container .diff-container{display:flex;align-items:center}.diff-feedback-container .diff-btn{border:none!important;background:transparent!important;color:#999;margin:0;padding:0;font-size:12px;height:auto}.diff-feedback-container .diff-btn+.diff-btn{display:inline-flex;align-items:center}.diff-feedback-container .diff-btn+.diff-btn:before{content:"";display:inline-block;width:1px;height:12px;background:#ccc;position:static;margin-right:4px;margin-left:4px}.diff-feedback-container .diff-btn.very-simple:hover{color:var(--q-verysimple-text-color)!important}.diff-feedback-container .diff-btn.simple:hover{color:var(--q-simple-text-color)!important}.diff-feedback-container .diff-btn.normal:hover{color:var(--q-normal-text-color)!important}.diff-feedback-container .diff-btn.bit-hard:hover{color:var(--q-bithard-text-color)!important}.diff-feedback-container .diff-btn.hard:hover{color:var(--q-hard-text-color)!important}.diff-mobile-container .diff-fb-btn{font-size:12px;color:#999;padding:0}.diff-mobile-container .diff-fb-btn .anticon,.diff-mobile-container .diff-fb-btn .fishicon{vertical-align:-5px}.diff-mobile-container .diff-fb-btn .anticon+span,.diff-mobile-container .diff-fb-btn .fishicon+span{margin-left:4px}.fish-overlay-wrap{position:fixed}.fish-overlay-wrap,.fish-overlay-wrap .fish-overlay{top:0;right:0;bottom:0;left:0;z-index:11;overflow:auto}.fish-overlay-wrap .fish-overlay{position:absolute;background:#fff}.fish-overlay-wrap .fish-overlay-header{padding:12px 35px 20px 20px;color:#666;background:#fff;border-bottom:1px solid #e8e8e8;border-radius:6px 6px 0 0}.fish-overlay-wrap .fish-overlay-close{position:absolute;top:16px;right:18px;z-index:10;color:rgba(0,0,0,.85);line-height:1;text-decoration:none;background:transparent;border:0;outline:0;cursor:pointer;-webkit-transition:color .3s ease;transition:color .3s ease}.fish-overlay-wrap .fish-overlay-close:focus,.fish-overlay-wrap .fish-overlay-close:hover{color:#444;text-decoration:none}.code-exercise-overlay-root{z-index:999;background:rgba(0,0,0,.6)}.code-exercise-overlay-root .code-exercise-overlay{top:24px;display:flex;flex-direction:column;border-radius:24px 24px 0 0;background:#f5f7fb}.code-exercise-overlay-root .code-exercise-overlay .fish-overlay-close{right:calc(50% - 684px)}@media screen and (max-width:1368px){.code-exercise-overlay-root .code-exercise-overlay .fish-overlay-close{right:18px}}.code-exercise-overlay-root .code-exercise-overlay .fish-overlay-header{padding:7px 0;border:none}.code-exercise-overlay-root .code-exercise-overlay .fish-overlay-header .fish-overlay-title{width:100%;max-width:1368px;color:#333;font-feature-settings:"liga" off,"clig" off;font-family:PingFang SC;font-size:20px;font-style:normal;font-weight:600;line-height:28px;margin:0 auto;padding-left:18px}.code-exercise-overlay-root .code-exercise-overlay .code-exercise-content{flex:1;display:flex;justify-content:center;align-items:center;background:#f9f9f9;padding:16px 0 24px;overflow:hidden}.code-exercise-overlay-root .code-exercise-overlay .code-exercise-content .code-exercise-iframe{width:100%;height:100%;border:none;min-height:400px;max-width:1368px;background:#fff}.code-answer-root .code-answer-actions{display:flex;padding:24px;flex-direction:column;align-items:center;gap:10px;align-self:stretch}.code-answer-root .code-answer-actions .fish-btn,.code-answer-root .code-answer-actions .fish-btn:active,.code-answer-root .code-answer-actions .fish-btn:focus,.code-answer-root .code-answer-actions .fish-btn:hover{display:flex;height:40px;padding:8px 24px;justify-content:center;align-items:center;gap:10px;border-radius:144.889px;background:var(--AI,linear-gradient(90deg,#3a78f6 0,#28d3fd 100%));color:var(--Text-on-default-fff,#fff);font-feature-settings:"liga" off,"clig" off;font-family:PingFang SC;font-size:16px;font-style:normal;font-weight:400;line-height:24px;box-shadow:none}.code-answer-root .code-answer-mobile-tip{font-feature-settings:"liga" off,"clig" off;font-family:PingFang SC;font-size:14px;padding:16px;color:#f53f3f;font-style:normal;font-weight:400;line-height:20px}.code-answer-root .code-exercise-result .code-exercise-result-iframe{border:none;width:100%;height:627px}