:root{--box-background-color:#fff;--box-background-alt-color:#f9f9f9;--box-background-hover-color:#fafafa;--box-border-color:#e2e2e2;--box-border-radius:3px}h1{font-size:22px;font-weight:600;line-height:100%;margin:15px 0;padding:0;word-break:break-word}h2{font-size:18px;font-weight:600;line-height:100%;margin:25px 0 15px;padding:0 0 8px;border-bottom:1px solid var(--box-border-color);word-break:break-word}h3{font-size:16px;font-weight:600;line-height:100%;margin:20px 0 15px;padding:0;word-break:break-word}hr{border:none;height:1px;color:var(--box-border-color);background-color:var(--box-border-color);margin-bottom:1em}pre{font-family:Consolas,panic sans,dejavu sans mono,bitstream vera sans mono,Menlo,microsoft yahei,monospace;font-size:13px;letter-spacing:.015em;line-height:120%;white-space:pre;overflow-x:auto;overflow-y:auto;background-color:#f5f5f5;padding:.5em}pre a{color:inherit;text-decoration:underline}code{font-family:Consolas,panic sans,dejavu sans mono,bitstream vera sans mono,Menlo,microsoft yahei,monospace;white-space:pre-wrap}a:active,a:link,a:visited{color:#778087;text-decoration:none;word-break:break-word}a:hover{color:#4d5256;text-decoration:underline}a.topic-link:active,a.topic-link:link{color:#778087;text-decoration:none;word-break:break-word}a.topic-link:visited{color:#afb9c1;text-decoration:none;word-break:break-word}a.topic-link:hover{color:#4d5256;text-decoration:underline}a.google-signin:link{width:191px;height:46px;background-image:url(/static/img/btn_google_signin_light_normal_web@2x.png);background-size:191px 46px;background-repeat:no-repeat;border:none;text-decoration:none;display:inline-block}a.google-signin:hover{background-image:url(/static/img/btn_google_signin_light_normal_web@2x.png)}a.google-signin:active{background-image:url(/static/img/btn_google_signin_light_pressed_web@2x.png)}a.dark:active,a.dark:link,a.dark:visited{color:gray;text-decoration:none}a.dark:hover{color:#385f8a;text-decoration:none}a.gray:active,a.gray:link,a.gray:visited{color:#ccc;text-decoration:none}a.gray:hover{color:#999;text-decoration:none}a.top:link,a.top:visited{color:#556;text-decoration:none}a.top:hover{color:#99a;text-decoration:none}a.top:active{color:#001;text-decoration:none}a.tab:active,a.tab:link,a.tab:visited{display:inline-block;font-size:14px;line-height:14px;padding:5px 8px;margin-right:5px;border-radius:var(--box-border-radius);color:#555}a.tab:hover{background-color:#f5f5f5;color:#000;text-decoration:none}a.tab_current:active,a.tab_current:link,a.tab_current:visited{display:inline-block;font-size:14px;line-height:14px;padding:5px 8px;margin-right:5px;border-radius:3px;background-color:#334;color:#fff}a.tab_current:hover{background-color:#445;color:#fff;text-decoration:none}a.node:active,a.node:link,a.node:visited{background-color:#f5f5f5;font-size:12px;line-height:12px;display:inline-block;padding:4px;-moz-border-radius:2px;-webkit-border-radius:2px;border-radius:2px;text-decoration:none;color:#999}a.node:hover{text-decoration:none;background-color:#e2e2e2;color:#777}.op:active,.op:link,.op:visited{background-color:#f0f0f0;font-size:12px;line-height:12px;display:inline-block;padding:4px 4px 3px;border-radius:3px;text-decoration:none;border:1px solid #ddd;color:#666;vertical-align:baseline}.op:hover{text-decoration:none;background-color:#e0e0e0;border:1px solid silver;color:#333}a.opo:active,a.opo:link,a.opo:visited{background-color:#d0d0df;font-size:12px;line-height:12px;display:inline-block;padding:3px 4px;border-radius:3px;text-decoration:none;color:#333}a.opo-100:active,a.opo-100:link,a.opo-100:visited{background-color:#323a45;font-size:12px;line-height:12px;display:inline-block;padding:3px 4px;border-radius:3px;text-decoration:none;color:#eee}a.opo-1000:active,a.opo-1000:link,a.opo-1000:visited{background-color:#3f6184;font-size:12px;line-height:12px;display:inline-block;padding:3px 4px;border-radius:3px;text-decoration:none;color:#ddd}a.opo-50000:active,a.opo-50000:link,a.opo-50000:visited{background-color:#789;font-size:12px;line-height:12px;display:inline-block;padding:3px 4px;border-radius:3px;text-decoration:none;color:#ccc}a.opo-100000:active,a.opo-100000:link,a.opo-100000:visited{background-color:#f6f7f9;font-size:12px;line-height:12px;display:inline-block;padding:3px 4px;border-radius:3px;text-decoration:none;color:#333}a.tb:active,a.tb:link,a.tb:visited{font-size:12px;line-height:12px;color:#333;text-decoration:none;display:inline-block;padding:3px 10px;border-radius:15px;text-shadow:0 1px 0 #fff}a.tb:hover{background-color:rgba(255,255,255,.3);color:#000;text-decoration:none;border-radius:15px}a.black:active,a.black:link,a.black:visited{color:#000;text-decoration:none}a.black:hover{color:#000;text-decoration:underline;text-shadow:0 1px 1px rgba(255,255,255,.2)}a.black_alt:link,a.black_alt:visited{color:#000;text-decoration:none}a.black_alt:hover{color:#5a5a5a;text-decoration:none}a.black_alt:active{color:#000;text-decoration:none}ul{margin:15px 0 15px 20px;padding:0}ol li,ul li{padding:0;margin:0}ol{margin:1em 0 0 2em;padding:0}#Logo{width:94px;height:30px;background-image:url(/static/img/v2ex@2x.png);background-size:94px 30px;background-repeat:no-repeat;display:inline-block}#LogoMobile{width:80px;height:25px;background-image:url(/static/img/v2ex@2x.png);background-size:80px 25px;background-repeat:no-repeat;display:inline-block}#Top{text-align:center;background-color:var(--box-background-color);height:44px;font-size:15px;font-weight:500;background-size:44px 44px;border-bottom:1px solid rgba(0,0,0,.22);padding:0 20px}#Tabs{background-color:var(--box-background-color);border-top-left-radius:3px;border-top-right-radius:3px}#SecondaryTabs{background-color:var(--box-background-alt-color);padding:10px 10px 10px 20px}#Wrapper{text-align:center;background-color:#e2e2e2;background-image:url(/static/img/shadow_light.png);background-repeat:repeat-x}#Bottom{border-top:1px solid rgba(0,0,0,.22);background-color:var(--box-background-color);text-align:center;color:#999;padding:0 10px}#DigitalOcean{background-image:url(/static/img/do_logo.png);width:163.92px;height:28px;background-size:163.92px 28px;background-repeat:no-repeat}#MyNodes{text-align:left;background-color:#f9f9f9}#MySQL{background-color:#001d25;padding:5px;font-size:12px;color:#fff;border-top:2px solid #ccc;text-align:left}#Leftbar{width:0;float:left}#Rightbar{width:270px;float:right;margin-right:20px}#Main{width:auto;margin:0 310px 0 20px}#Singleton{width:auto;margin:0 20px;background-color:var(--box-background-color);border-radius:var(--box-border-radius);box-shadow:0 2px 3px rgba(0,0,0,.1);border-bottom:1px solid #e2e2e2;display:flex;flex:1}#Navcol{float:left;width:200px;text-align:left;background-color:#f9f9f9;border-top-left-radius:var(--box-border-radius);border-bottom-left-radius:var(--box-border-radius)}#Rightcol{float:right;width:300px;min-height:600px;text-align:left;background-color:#f9f9f9}#Maincol{text-align:left;flex:1}#qbar{width:276px;height:28px;background-size:276px 28px;background-image:url(/static/img/qbar_light@2x.png);background-repeat:no-repeat;display:inline-block}#q{border:none;width:222px;height:26px;margin:0 0 2px 30px;background-color:transparent;font-family:helvetica neue,luxi sans,dejavu sans,Tahoma,hiragino sans gb,STHeiti!important;font-size:14px;line-height:16px;outline:0}.alt{background-color:#f5f5f5}.corner_left{border-top-left-radius:3px;border-bottom-left-radius:3px}.corner_right{border-top-right-radius:3px;border-bottom-right-radius:3px}.gray{color:#999}.fade{color:#ccc}.snow{color:#e2e2e2}.green{color:#393}.orange{color:#f90}.blue{color:#485cc7}.bigger{font-size:16px}.small{font-size:11px}.content{min-width:600px;max-width:1100px;margin:0 auto}#Top>.content{max-width:1060px}.box{background-color:var(--box-background-color);border-radius:var(--box-border-radius);box-shadow:0 2px 3px rgba(0,0,0,.1);border-bottom:1px solid #e2e2e2}.transparent{background-color:transparent;border:2px dashed rgba(0,0,0,.1);border-radius:var(--box-border-radius);box-shadow:none;color:rgba(0,0,0,.1)}.page{font-size:14px;line-height:1.6;padding:10px}.page_singleton{font-size:14px;line-height:1.6;padding:20px}.inner{padding:10px;font-size:14px;line-height:150%;text-align:left}.header{padding:10px;font-size:15px;line-height:120%;text-align:left;border-bottom:1px solid #e2e2e2;overflow:auto}.caution{padding:10px;font-size:14px;line-height:150%;text-align:left;background-color:#f0f0f0;border-top:1px solid #e2e2e2;border-bottom:1px solid #e2e2e2}.dock_area{background-color:#edf3f5;background-image:url(/static/img/dock_shadow.png);background-repeat:repeat-x;padding:0}.cell{padding:10px;font-size:14px;line-height:120%;text-align:left;border-bottom:1px solid var(--box-border-color)}.node_header{padding:0;font-size:14px;line-height:120%;text-align:left;background-color:#001d25;color:#fff;border-top-left-radius:3px;border-top-right-radius:3px;display:flex}.node_avatar{width:73px;padding:10px;box-sizing:content-box}.node_info{padding:10px 10px 0 0;width:100%}.node_header_link:link,.node_header_link:visited,.node_info a:link,.node_info a:visited{color:#03c8ff;text-decoration:none}.node_header_link:hover,.node_info a:hover{color:#03c8ff;text-decoration:underline}.node_header_tab:link,.node_header_tab:visited{display:inline-block;color:#fff;line-height:100%;padding:5px 10px;border-bottom:3px solid transparent;text-decoration:none!important}.node_header_tab:hover{display:inline-block;color:#03c8ff!important;line-height:100%;padding:5px 10px;border-bottom:3px solid #03c8ff;text-decoration:none!important}.node_header_tab_current:link,.node_header_tab_current:visited{display:inline-block;color:#fff!important;line-height:100%;padding:5px 10px;border-bottom:3px solid #fff;text-decoration:none!important}.node_header_tab_current:hover{display:inline-block;color:#03c8ff!important;line-height:100%;padding:5px 10px;border-bottom:3px solid #03c8ff;text-decoration:none!important}.cell_tabs{padding:10px 10px 0;border-bottom:1px solid var(--box-border-color);text-align:center}.cell_tab:link,.cell_tab:visited{font-size:14px;border-bottom:3px solid transparent;display:inline-block;text-decoration:none;margin-right:15px;padding:0 5px 5px;color:#99a}.cell_tab:hover{color:#778087;border-bottom:3px solid #f0f0f0}.cell_tab_current:link,.cell_tab_current:visited{font-size:14px;border-bottom:3px solid #778087;display:inline-block;text-decoration:none;margin-right:15px;padding:0 5px 5px}.cell_ops{padding:10px;font-size:12px;line-height:120%;text-align:left;border-bottom:1px solid var(--box-border-color);background-color:#f9f9f9;box-shadow:0 1px 2px rgba(0,0,0,.05) inset}.collapsed{display:none}.well{padding:10px;background-color:#f9f9f9;border-radius:5px;box-shadow:0 2px 3px rgba(0,0,0,.1) inset}.valley{padding:10px;font-size:14px;line-height:120%;text-align:left;border-bottom:1px solid var(--box-border-color);background-image:url(/static/img/shadow_light.png);background-size:20px 20px;background-repeat:repeat-x}.footnotes{padding:10px;background-color:#f9f9f9;border-radius:3px;font-size:14px;line-height:180%;color:#999}.footnotes>ul{margin:0 1.5em}.ref_logo{font-size:20px;line-height:100%;font-weight:500;padding:10px}.ref_logo_css{display:inline-block;vertical-align:middle;width:32px;height:32px;background-image:url(/static/img/ref_icon_css.png);background-repeat:no-repeat;background-size:32px 32px}.ref_logo_tools{display:inline-block;vertical-align:middle;width:32px;height:32px;background-image:url(/static/img/ref_icon_tools.png);background-repeat:no-repeat;background-size:32px 32px}.ref_logo_help{display:inline-block;vertical-align:middle;width:32px;height:32px;background-image:url(/static/img/ref_icon_help.png);background-repeat:no-repeat;background-size:32px 32px}.cell[id^=r_]>table,.inner[id^=r_]>table{table-layout:fixed}div.node{padding:5px;background-color:transparent;border-radius:3px;box-shadow:none}div.node .node_compose{float:right;visibility:hidden;margin:3px 0 0}div.node:hover{background-color:#f9f9f9;box-shadow:0 1px 2px rgba(0,0,0,.1) inset}div.node:hover .node_compose{float:right;visibility:visible}.subtle{background-color:#fffff9;border-left:3px solid #fffbc1;padding:10px;font-size:14px;line-height:120%;text-align:left;border-bottom:1px solid var(--box-border-color)}.grid{padding:0;font-size:14px;line-height:120%;text-align:left}.problem{padding:10px;font-size:14px;line-height:120%;text-align:left;background-color:#ffffc0;border-left:5px solid #fff000;border-bottom:1px solid var(--box-border-color);color:#333}.outdated{padding:10px;font-size:14px;line-height:120%;text-align:left;background-color:#f9f9f9;border-left:5px solid #f0f0f0;border-bottom:1px solid var(--box-border-color);color:#999}.message{padding:10px;font-size:14px;line-height:120%;text-align:left;background-color:#f3faff;border-left:5px solid #c7e8ff;border-bottom:1px solid var(--box-border-color);color:#333;cursor:pointer}.cell a.thank,.inner a.thank{display:inline-block;line-height:12px;visibility:hidden}.cell:hover a.thank,.inner:hover a.thank{display:inline-block;line-height:12px;border-radius:5px;visibility:visible}.cell:hover a.thank:hover,.inner:hover a.thank:hover{background-color:#f5f5f5;text-decoration:none}.grid_item{background-color:#f9f9f9;width:25%;height:160px;padding:0;margin:0;box-shadow:none;display:inline-block;transition:box-shadow .2s;text-decoration:none}.grid_item:hover{background-color:#f0f0f0;box-shadow:0 5px 20px rgba(0,0,0,.08) inset;cursor:pointer;text-decoration:none}.thank_area{display:inline-block;padding:2px 5px;line-height:12px}.thanked{display:inline-block;background-color:#f9f9f9;color:#e0e0e0;border-radius:3px}.topic_thanked{font-size:11px;color:#999;text-shadow:0 1px 0 #fff}.widgets{display:flex;flex-flow:row wrap;padding:5px}.social_label:link,.social_label:visited{background-color:#f9f9f9;padding:5px 15px 5px 6px;font-size:14px;line-height:100%;text-decoration:none;display:inline-block;border-radius:20px;outline:0;margin:5px}.social_label:hover{background-color:#e9e9e9;outline:0}.social_label:active{box-shadow:0 2px 5px rgba(0,0,0,.2) inset;outline:0}.node_impressions{display:flex;border-bottom:1px solid var(--box-border-color)}.node_impressions_avatar{padding:10px;width:73px;flex:none!important}.node_impressions_info{padding:10px;text-align:left;width:240px;flex:none!important}.node_impressions_numbers{padding:10px;background-color:#f5f5f5;text-align:left;width:100%;flex:1;font-size:14px;line-height:150%}.backstage_node_access{display:flex;border-bottom:1px solid var(--box-border-color)}.backstage_node_access_avatar{padding:10px;width:32px;flex:none!important}.backstage_node_access_info{padding:10px;text-align:left;width:100%;flex:1;font-size:14px;line-height:150%}.backstage_node_access_op{flex:none!important;width:auto;padding:10px;background-color:#f5f5f5;font-size:14px}.sep20{height:20px}.sep10{height:10px}.sep5{height:5px}.sep3{height:3px}.c{clear:both}.chevron{font-family:lucida grande;font-weight:500}.fr{float:right;text-align:right}.fl{float:left}.f11{font-size:11px}.f12{font-size:12px}.f13{font-size:13px}.f14{font-size:14px}.ago{font-size:11px;color:#ccc;cursor:pointer}.no{font-size:9px;line-height:9px;font-weight:500;border-radius:10px;display:inline-block;background-color:#f0f0f0;color:#ccc;padding:2px 5px;cursor:pointer}.reply_content{font-size:14px;line-height:1.6;color:#000;word-break:break-word}.topic_content{font-size:14px;line-height:1.6;color:#000;word-break:break-word}.topic_stats{text-shadow:0 1px 0 #fff;font-size:11px;color:#999;line-height:100%}.gist{word-break:normal}.challenge_container{background-color:#f9f9f9;border-radius:3px;border:1px solid #d3d3d3;padding:12px;box-shadow:0 1px 4px rgba(0,0,0,.08);display:inline-block}.reply_content .gist .gist-data,.topic_content .gist .gist-data{max-height:20em}.reply_content>:first-child,.topic_content>:first-child{margin-top:0!important}.gist>:last-child,.reply_content>:last-child,.topic_content>:last-child{margin-bottom:0!important}.syntax_error{background-color:#e2e2e2;padding:7px;color:#000;font-size:14px;line-height:100%;margin-top:-10px}.topic_buttons{padding:5px;font-size:14px;line-height:120%;background:#eee;background:-moz-linear-gradient(top,#eee 0,#ccc 100%);background:-webkit-gradient(linear,left top,left bottom,color-stop(0,#eee),color-stop(100%,#ccc));background:-webkit-linear-gradient(top,#eee 0,#ccc 100%);background:-o-linear-gradient(top,#eee 0,#ccc 100%);background:-ms-linear-gradient(top,#eee 0,#ccc 100%);background:linear-gradient(to bottom,#eee 0,#ccc 100%);filter:progid:DXImageTransform.Microsoft.gradient( startColorstr='#eeeeee',endColorstr='#cccccc',GradientType=0 );border-radius:0 0 3px 3px;text-align:left}.topic_info{font-size:12px;color:#ccc;line-height:200%}#topic_thank{display:inline-block}.sl{border-radius:3px;padding:5px;font-size:14px;border:1px solid #ccc;width:320px;font-family:helvetica neue,luxi sans,dejavu sans,Tahoma,hiragino sans gb,microsoft yahei,sans-serif;box-sizing:border-box}.sl:focus{border:1px solid rgba(128,128,160,.6);outline:0}.sls{border-radius:3px;padding:5px;font-size:14px;border:1px solid #ccc;width:240px;font-family:helvetica neue,luxi sans,dejavu sans,Tahoma,hiragino sans gb,microsoft yahei}.sls:focus{border:1px solid rgba(128,128,160,.6);outline:0}.sll{border-radius:3px;padding:5px;font-size:14px;border:1px solid #ccc;width:100%;font-family:helvetica neue,luxi sans,dejavu sans,Tahoma,hiragino sans gb,microsoft yahei,sans-serif;box-sizing:border-box}.sll:focus{border:1px solid rgba(128,128,160,.6);outline:0}.ml{border-radius:3px;padding:5px;font-size:14px;border:1px solid #ccc;display:block;width:320px;height:160px;font-family:helvetica neue,luxi sans,dejavu sans,Tahoma,hiragino sans gb,microsoft yahei,sans-serif;box-sizing:border-box}.ml:focus{border:1px solid rgba(128,128,160,.6);outline:0}.mll{border-radius:3px;padding:5px;font-size:14px;border:1px solid #ccc;display:block;width:100%;height:8em;overflow-y:auto;font-family:helvetica neue,luxi sans,dejavu sans,Tahoma,hiragino sans gb,microsoft yahei,sans-serif;resize:vertical;box-sizing:border-box}.mll:focus{border:1px solid rgba(128,128,160,.6);outline:0}.mle{border-radius:3px;padding:5px;font-size:14px;border:1px solid #ccc;display:block;width:100%;font-family:helvetica neue,luxi sans,dejavu sans,Tahoma,hiragino sans gb,microsoft yahei,sans-serif;resize:vertical;box-sizing:border-box}.mle:focus{border:1px solid rgba(128,128,160,.6);outline:0}::-webkit-input-placeholder{color:silver}:-moz-placeholder{color:silver}::-moz-placeholder{color:silver}:-ms-input-placeholder{color:silver}.msl{width:100%;border:none;resize:none;background-color:#f9f9f9;outline:0;font-size:14px;line-height:20px;padding:10px;font-family:helvetica neue,hiragino sans gb,microsoft yahei,sans-serif;margin:0;box-sizing:border-box}.msl:focus{background-color:#fff}.short{height:52px}.tall{height:320px}.super.button{background-image:url(/static/img/bg_blended_light.png);padding:4px 8px;border:1px solid rgba(80,80,90,.2);border-bottom-color:rgba(80,80,90,.35);border-radius:3px;font-size:14px;outline:0}.normal.button{background-color:#fff;color:#333;text-shadow:0 1px 0 #fff;text-decoration:none;font-weight:700;box-shadow:0 1px 0 rgba(66,66,77,.1)}.normal.button:disabled{background-color:#fff;color:#ccc;text-shadow:0 1px 0 #fff;text-decoration:none;font-weight:700;box-shadow:0 1px 0 rgba(66,66,77,.1)}.normal.button:hover:enabled{background-color:#f9f9f9;border:1px solid rgba(60,60,70,.3);color:#333;text-shadow:0 1px 0 #fff;text-decoration:none;font-weight:700;cursor:pointer;box-shadow:0 1px 0 rgba(66,66,77,.1)}.normal.button:active:enabled{background-color:#e2e2e2;color:#333;text-shadow:0 1px 0 #fff;text-decoration:none;font-weight:700;cursor:pointer;box-shadow:0 1px 0 rgba(66,66,77,.1)}.normal_page_right.button{background-color:#fff;color:#333;text-shadow:0 1px 0 #fff;text-decoration:none;font-weight:700;box-shadow:0 1px 0 rgba(66,66,77,.1)}.normal_page_right.button:disabled{background-color:#fff;color:#ccc;text-shadow:0 1px 0 #fff;text-decoration:none;font-weight:700;box-shadow:0 1px 0 rgba(66,66,77,.1)}.normal_page_right.button:hover:enabled{background-color:#f9f9f9;border-left:1px solid rgba(80,80,90,.2);border-top:1px solid rgba(60,60,70,.3);border-right:1px solid rgba(60,60,70,.3);border-bottom:1px solid rgba(60,60,70,.3);color:#333;text-shadow:0 1px 0 #fff;text-decoration:none;font-weight:700;cursor:pointer;box-shadow:0 1px 0 rgba(66,66,77,.1)}.normal_page_right.button:active:enabled{background-color:#e2e2e2;color:#333;text-shadow:0 1px 0 #fff;text-decoration:none;font-weight:700;cursor:pointer;box-shadow:0 1px 0 rgba(66,66,77,.1)}.disable_now{color:#ccc!important;background-color:#fff!important}.hover_now{cursor:pointer;color:#333!important;background-color:#f9f9f9!important;text-shadow:0 1px 0 #fff!important}.active_now{background-color:#e2e2e2!important}.special.button{background-color:#fc0;color:#532b17;text-shadow:0 1px 1px rgba(255,255,255,.6);text-decoration:none;font-weight:600;box-shadow:0 1px 2px rgba(233,175,0,.6);border:1px solid rgba(200,150,0,.8)}.special.button:hover{background-color:#ffdf00;color:#402112;text-shadow:0 1px 1px rgba(255,255,255,.7);text-decoration:none;text-decoration:none;font-weight:600;cursor:pointer;box-shadow:0 1px 2px rgba(233,175,0,.5);border:1px solid #c89600}.special.button:active{background-color:#fb0;color:#402112;text-shadow:0 1px 1px rgba(255,255,255,.7);text-decoration:none;text-decoration:none;font-weight:600;cursor:pointer;box-shadow:0 1px 2px rgba(233,175,0,.5);border:1px solid #c89600}.inverse.button{background-color:#ccc;color:#999;text-shadow:0 1px 1px rgba(255,255,255,.6);text-decoration:none;font-weight:600;box-shadow:0 1px 2px rgba(200,200,200,.8);border:1px solid rgba(150,150,150,.8)}.inverse.button:hover{background-color:#999;color:#fff;text-shadow:0 -1px 1px rgba(0,0,0,.5);text-decoration:none;text-decoration:none;font-weight:600;cursor:pointer;box-shadow:0 1px 2px #c8c8c8;border:1px solid rgba(150,150,150,.6)}.inverse.button:active{background-color:#888;color:#fff;text-shadow:0 -1px 1px rgba(0,0,0,.5);text-decoration:none;text-decoration:none;font-weight:600;cursor:pointer;box-shadow:0 1px 2px #c8c8c8;border:1px solid rgba(150,150,150,.6)}.item{background-position:0 bottom;background-repeat:repeat-x}.item_node{font-size:14px;line-height:14px;padding:4px 10px;margin:0 5px 5px 0;border-radius:16px;display:inline-block;border:1px solid #e5e5e5}.item_node:hover{text-decoration:none;color:#333;border:1px solid #ccc;box-shadow:0 1px 2px rgba(0,0,32,.1)}.item_node:active{text-decoration:none;background-color:#f9f9f9;color:#333;border:1px solid #ccc;box-shadow:0 1px 2px rgba(0,0,32,.1) inset;outline:0}.item_title{font-size:16px;line-height:130%;text-shadow:0 1px 0 #fff;word-break:break-word;hyphens:auto}.item_hot_topic_title{font-size:13px;line-height:120%;text-shadow:0 1px 0 #fff}.tag:link,.tag:visited{padding:5px 10px;line-height:100%;background-color:#f0f0f0;border-radius:10px;margin:0 5px;display:inline-block}.tag:hover{background-color:#99a;color:#fff;text-decoration:none}.tag>li{opacity:.15}a.count_orange:active,a.count_orange:link{line-height:12px;font-weight:700;color:#fff;background-color:#f90;display:inline-block;padding:2px 10px;-moz-border-radius:12px;-webkit-border-radius:12px;border-radius:12px;text-decoration:none;margin-right:5px;word-break:break-all}a.count_orange:hover{line-height:12px;font-weight:700;color:#fff;background-color:#ffa722;display:inline-block;padding:2px 10px;-moz-border-radius:12px;-webkit-border-radius:12px;border-radius:12px;text-decoration:none}a.count_livid:active,a.count_livid:link{line-height:12px;font-weight:700;color:#fff;background-color:#aab0c6;display:inline-block;padding:2px 10px;-moz-border-radius:12px;-webkit-border-radius:12px;border-radius:12px;text-decoration:none;margin-right:5px;word-break:break-all}a.count_livid:hover{line-height:12px;font-weight:700;color:#fff;background-color:#969cb1;display:inline-block;padding:2px 10px;-moz-border-radius:12px;-webkit-border-radius:12px;border-radius:12px;text-decoration:none}a.count_blue:visited,a.count_green:visited,a.count_livid:visited,a.count_orange:visited{line-height:12px;font-weight:700;color:#fff;background-color:#e5e5e5;display:inline-block;padding:2px 10px;-moz-border-radius:12px;-webkit-border-radius:12px;border-radius:12px;text-decoration:none;margin-right:5px}.page_current{display:inline-block;font-weight:700;font-size:14px;line-height:14px;padding:3px 6px;background-color:#f0f0f0;-moz-border-radius:3px;-webkit-border-radius:3px;border-radius:3px;margin:0 1px;border:1px solid #bbb;color:#000;box-shadow:0 1px 1px rgba(0,0,0,.1)}.page_current:hover{text-decoration:none}.page_normal:active,.page_normal:link,.page_normal:visited{display:inline-block;font-weight:400;font-size:13px;line-height:13px;padding:2px 5px;background-color:#fff;-moz-border-radius:3px;-webkit-border-radius:3px;border-radius:3px;margin:0 1px;text-decoration:none;border:1px solid #e2e2e2;box-shadow:0 1px 1px rgba(0,0,0,.1)}.page_normal:hover{background-color:#f0f0f0;color:#000;text-decoration:none;border:1px solid #ccc}.page_input{padding:4px;font-size:14px;line-height:14px;border:1px solid #e2e2e2;border-radius:3px;width:40px;background-color:#fff;box-shadow:0 1px 1px rgba(0,0,0,.1) inset;color:#ccc}.page_input:focus{color:#666;border:1px solid #ccc}.online{color:#fff;font-size:10px;line-height:10px;font-weight:500;padding:2px 5px;-moz-border-radius:10px;-webkit-border-radius:10px;border-radius:10px;display:inline-block;background:#52bf1c;background:-moz-linear-gradient(top,#52bf1c 0,#438906 100%);background:-webkit-gradient(linear,left top,left bottom,color-stop(0,#52bf1c),color-stop(100%,#438906));background:-webkit-linear-gradient(top,#52bf1c 0,#438906 100%);background:-o-linear-gradient(top,#52bf1c 0,#438906 100%);background:-ms-linear-gradient(top,#52bf1c 0,#438906 100%);background:linear-gradient(top,#52bf1c 0,#438906 100%);filter:progid:DXImageTransform.Microsoft.gradient( startColorstr='#52bf1c',endColorstr='#438906',GradientType=0 )}.payload{display:inline-block;background-color:#f5f5f5;padding:5px 10px;font-size:14px;line-height:120%;-moz-border-radius:3px;-webkit-border-radius:3px;border-radius:3px;word-break:break-word}.balance_area img{vertical-align:middle}.balance_area.bigger img{vertical-align:baseline}.balance_area,a.balance_area:link,a.balance_area:visited{color:#000;font-size:11px;line-height:16px;padding:5px 10px;-moz-border-radius:20px;-webkit-border-radius:20px;border-radius:20px;text-decoration:none;color:#666;text-shadow:0 1px 0 #fff;display:inline-block;vertical-align:top;background:#f5f5f5;background:-moz-linear-gradient(top,#f5f5f5 0,#e2e2e2 100%);background:-webkit-gradient(linear,left top,left bottom,color-stop(0,#f5f5f5),color-stop(100%,#e2e2e2));background:-webkit-linear-gradient(top,#f5f5f5 0,#e2e2e2 100%);background:-o-linear-gradient(top,#f5f5f5 0,#e2e2e2 100%);background:-ms-linear-gradient(top,#f5f5f5 0,#e2e2e2 100%);background:linear-gradient(top,#f5f5f5 0,#e2e2e2 100%);filter:progid:DXImageTransform.Microsoft.gradient( startColorstr='#f5f5f5',endColorstr='#e2e2e2',GradientType=0 )}a.balance_area:active{text-decoration:none;color:#333;color:#000;background:#f0f0f0;background:-moz-linear-gradient(top,#f0f0f0 0,#c9c9c9 100%);background:-webkit-gradient(linear,left top,left bottom,color-stop(0,#f0f0f0),color-stop(100%,#c9c9c9));background:-webkit-linear-gradient(top,#f0f0f0 0,#c9c9c9 100%);background:-o-linear-gradient(top,#f0f0f0 0,#c9c9c9 100%);background:-ms-linear-gradient(top,#f0f0f0 0,#c9c9c9 100%);background:linear-gradient(top,#f0f0f0 0,#c9c9c9 100%);filter:progid:DXImageTransform.Microsoft.gradient( startColorstr='#f0f0f0',endColorstr='#c9c9c9',GradientType=0 )}a.balance_area:hover{text-decoration:none;color:#333;color:#000;background:#f9f9f9;background:-moz-linear-gradient(top,#f9f9f9 0,#f0f0f0 100%);background:-webkit-gradient(linear,left top,left bottom,color-stop(0,#f9f9f9),color-stop(100%,#f0f0f0));background:-webkit-linear-gradient(top,#f9f9f9 0,#f0f0f0 100%);background:-o-linear-gradient(top,#f9f9f9 0,#f0f0f0 100%);background:-ms-linear-gradient(top,#f9f9f9 0,#f0f0f0 100%);background:linear-gradient(top,#f9f9f9 0,#f0f0f0 100%);filter:progid:DXImageTransform.Microsoft.gradient( startColorstr='#f9f9f9',endColorstr='#f0f0f0',GradientType=0 )}table.data td.h,table.data th.h{text-align:left;font-size:14px;font-weight:700;border-right:1px solid #ccc;border-bottom:2px solid #ccc;text-shadow:0 1px 0 #fff;background:#f5f5f5;background:-moz-linear-gradient(top,#f5f5f5 0,#e2e2e2 100%);background:-webkit-gradient(linear,left top,left bottom,color-stop(0,#f5f5f5),color-stop(100%,#e2e2e2));background:-webkit-linear-gradient(top,#f5f5f5 0,#e2e2e2 100%);background:-o-linear-gradient(top,#f5f5f5 0,#e2e2e2 100%);background:-ms-linear-gradient(top,#f5f5f5 0,#e2e2e2 100%);background:linear-gradient(top,#f5f5f5 0,#e2e2e2 100%);filter:progid:DXImageTransform.Microsoft.gradient( startColorstr='#f5f5f5',endColorstr='#e2e2e2',GradientType=0 )}table.data td.d{text-align:left;font-size:14px;font-weight:400;border-right:1px solid #ccc;border-bottom:1px solid #ccc}.positive{color:#0aa31c}.negative{color:#ff3c00}.note{font-size:15px;line-height:150%;font-family:helvetica neue,Arial,hiragino sans gb,microsoft yahei,sans-serif}.note_item{padding:10px;font-size:14px;line-height:100%;text-align:left;border-bottom:1px solid #e2e2e2}.note_item:hover{background-color:#f9f9f9}.note_item_icon_arrow{display:inline-block;width:16px;height:16px;vertical-align:middle;background-image:url(/static/img/ico_arrow.png);background-repeat:no-repeat;margin-right:8px;margin-top:-2px}.note_item_icon_code{display:inline-block;width:16px;height:16px;vertical-align:middle;background-image:url(/static/img/ico_code.png);background-repeat:no-repeat;margin-right:8px;margin-top:-2px}.note_item_icon_note{display:inline-block;width:16px;height:16px;vertical-align:middle;background-image:url(/static/img/ico_note.png);background-repeat:no-repeat;margin-right:8px;margin-top:-2px}.note_item_icon_note_arrow{display:inline-block;width:16px;height:16px;vertical-align:middle;background-image:url(/static/img/ico_note_arrow.png);background-repeat:no-repeat;margin-right:8px;margin-top:-2px}.note_item_icon_document_rich{display:inline-block;width:16px;height:16px;vertical-align:middle;background-image:url(/static/img/ico_document_rich.png);background-repeat:no-repeat;margin-right:8px;margin-top:-2px}.note_item_icon_folder{display:inline-block;width:16px;height:16px;vertical-align:middle;background-image:url(/static/img/ico_folder_blue.png);background-repeat:no-repeat;margin-right:8px;margin-top:-2px}.note_item_info{display:inline-block;float:right;color:#999;vertical-align:middle;margin-top:3px}.note_item_title{display:inline-block;font-size:14px;line-height:120%}.note_editor{width:655px;border:none;resize:none;background-color:transparent;color:#000;outline:0;font-size:15px;line-height:150%;font-family:helvetica neue,hiragino sans gb}#editor{position:relative;width:auto;height:600px;font-size:16px;line-height:130%}.event_badge{float:left;display:block;width:40px;text-align:center;padding:0 10px;border-left:4px solid #e2e2e2}.event_day{font-size:24px;line-height:24px;font-weight:700;color:#000;margin:5px 0}.event_month{font-size:14px;line-height:14px;font-weight:700;color:#999}.event_body{display:block;margin-left:74px}.event_title{font-size:15px;line-height:20px;font-weight:500;margin-bottom:5px}.event_brief{font-size:14px;line-height:120%;color:#666;margin-top:10px;margin-bottom:10px}.event_location{font-size:11px;line-height:20px;color:#999}.event_ops{padding-top:5px;font-size:12px;line-height:12px;color:#ccc}img.avatar{-moz-border-radius:4px;border-radius:4px}a.img_sq{width:25%;box-sizing:border-box;text-align:center;vertical-align:bottom;border:none;padding:5px;display:inline-block;text-decoration:none;background-color:#fff}a.img_sq:hover{text-decoration:none;background-color:#f0f0f0;border-radius:3px}a.img_view{max-width:100%;box-sizing:border-box;text-align:center;vertical-align:bottom;border:none;padding:5px;display:inline-block;text-decoration:none;background-color:#fff;border-radius:3px}a.img_view:hover{text-decoration:none;background-color:#f0f0f0}a.img_sqm{text-align:center;vertical-align:bottom;border:none;padding:4px 0 0 4px;display:inline-block;text-decoration:none;background-color:#fff}a.img_sqm:hover{text-decoration:none;background-color:#f0f0f0;border-radius:3px}a.btn_hero{background-color:#fff;border:1px solid #778087;font-size:18px;line-height:18px;padding:10px 20px;border-radius:5px}a.btn_hero:hover{color:#fff;background-color:#778087;text-decoration:none}.embedded_video_wrapper{position:relative;padding-bottom:52.9%;padding-top:25px;height:0}.embedded_video{position:absolute;top:0;left:0;width:100%;height:100%}.embedded_image{max-width:100%;image-orientation:from-image}.votes{display:inline-block}.vote,.vote:link,.vote:visited{text-decoration:none;font-size:10px;line-height:1;padding:2px 8px;border:1px solid #e2e2e2;border-radius:3px;color:#778;display:inline-block;vertical-align:baseline;text-align:center}.vote:hover{color:#667;border:1px solid #667;text-decoration:none}.vote:active{background-color:#f0f0f0;border:1px solid #aaa;box-shadow:0 1px 1px rgba(0,0,0,.2) inset}.markdown_body>:first-child,.note>:first-child,.page>:first-child{margin-top:0!important}.markdown_body>:last-child,.note>:last-child,.page>:last-child,.problem>:last-child{margin-bottom:0!important}.markdown_body img{max-width:100%}.markdown_body table{padding:0;border-collapse:collapse}.markdown_body table tr{border-top:1px solid #ccc;background-color:#fff;margin:0;padding:0}.markdown_body table tr:nth-child(2n){background-color:#f8f8f8}.markdown_body table tr th{font-weight:700;border:1px solid #ccc;margin:0;padding:6px 12px}.markdown_body table tr td{border:1px solid #ccc;margin:0;padding:6px 12px}.markdown_body table tr td :first-child,.markdown_body table tr th :first-child{margin-top:0}.markdown_body table tr td :last-child,.markdown_body table tr th :last-child{margin-bottom:0}ul.nav{margin:0;padding:0;list-style:none}ul.nav>li{display:block}ul.nav li a.nav_item,ul.nav li a.nav_item:visited{display:block;padding:10px 10px 10px 15px}ul.nav li a.nav_item_current,ul.nav li a.nav_item_current:visited{display:block;padding:10px 10px 10px 15px;background-color:#fff;color:#000}ul.nav li a.nav_item:hover{display:block;padding:10px 10px 10px 15px;background-color:#f0f0f0;color:#333;text-decoration:none}ul.nav li a.nav_item_current:hover{display:block;padding:10px 10px 10px 15px;background-color:#fff;color:#333;text-decoration:none}ul.nav li a.nav_item:active,ul.nav li a.nav_item_current:active{display:block;padding:10px 10px 10px 15px;background-color:#e9e9e9;box-shadow:0 2px 3px rgba(0,0,0,.1) inset;color:#333;text-decoration:none}.badge_mod{background-image:url(/static/img/mod@2x.png);background-repeat:no-repeat;background-size:30px 14px;display:inline-block;vertical-align:text-top;width:30px;height:14px}.convert_grid{text-align:center;vertical-align:middle;padding:10px!important}.convert_input{padding:5px;font-size:16px;width:100%;box-sizing:border-box}table.bs{border-collapse:collapse}table.bs td{border-collapse:collapse}.bs_left{border-bottom:1px solid var(--box-border-color);border-right:1px solid var(--box-border-color)}.bs_left2{border-bottom:1px solid var(--box-border-color);border-left:1px solid var(--box-border-color);border-right:1px solid var(--box-border-color)}.bs_right{border-bottom:1px solid var(--box-border-color);background-color:#f9f9f9}.status_editor{width:100%;border:none;resize:none;background-color:transparent;outline:0;font-size:14px;line-height:150%;font-family:helvetica neue,hiragino sans gb}.status{border-bottom:1px solid var(--box-border-color)}.status:hover{background-color:var(--box-background-hover-color)}.status_time{color:#ccc}.status_dot{color:#ccc}.status_ops{color:#ccc}.status:hover .status_ops{color:#999}.s_ops:active,.s_ops:link,.s_ops:visited{color:#ccc;text-decoration:none}.status:hover .s_ops:link{color:#ccc}.s_ops:hover{text-decoration:underline}.tl_item{padding:10px;display:flex;border-bottom:1px solid #e2e2e2}.tl_avatar{width:48px;height:48px;padding-right:10px}.tl_author{font-size:14px;padding-bottom:5px;font-weight:600;text-align:left}.tl_when{font-size:12px;color:#ccc;font-weight:400}.tl_content{font-size:14px;line-height:150%;text-align:left;color:#000}.signup_methods{display:flex;flex-direction:column;align-content:space-around;padding:15px}.signup_method{transition:box-shadow .4s ease,background-color .4s ease,color .4s ease;text-decoration:none;display:block;margin:15px auto;padding:10px;background-color:#fff;border-radius:52px;min-width:210px;line-height:100%;display:flex;box-shadow:0 1px 2px rgba(0,0,0,.05)}.signup_method:hover{box-shadow:0 3px 5px rgba(0,0,0,.1);cursor:pointer}.signup_method:active{box-shadow:0 3px 5px rgba(0,0,0,.05);background-color:#333;color:#fff}.signup_method:active>.signup_method_github{filter:invert(100%)}.signup_method_icon{background-color:transparent;display:inline-block;width:32px;height:32px}.signup_method_google{background-image:url(/static/img/social_google.png);background-size:32px 32px;background-repeat:no-repeat}.signup_method_github{background-image:url(/static/img/social_github.png);background-size:32px;background-size:32px}.signup_method_twitter{background-image:url(/static/img/social_twitter.png);background-size:32px;background-size:32px}.signup_method_label{font-size:16px;height:32px;line-height:32px;padding-left:.8em;color:#000}.member-activity-bar{width:250px;background-color:#f0f0f0;height:3px;display:inline-block;vertical-align:middle}.member-activity-done{height:3px;background-color:#333}.member-activity-almost{height:3px;background-color:#ffa800}.member-activity-half{height:3px;background-color:#7ec222}.member-activity-fourth{height:3px;background-color:#a9de62}.member-activity-start{height:3px;background-color:#ccc}.image-edit-left{background-color:#f0f0f0}.light-toggle:link,.light-toggle:visited{font-size:16px;padding:2px;line-height:120%;border-radius:2em;text-decoration:none;display:inline-block;width:1em;height:1em}.light-toggle:hover{background-color:#f0f0f0}.lang-selector:link,.lang-selector:visited{display:block;border-bottom:1px solid #e2e2e2;padding:10px;text-align:left}.lang-selector:hover{background-color:#f9f9f9;text-decoration:none}