.isk-video-shell{position:relative;background:#07090c;border:1px solid #ffffff19;border-radius:26px;overflow:hidden;outline:none;min-width:0}.isk-video-shell:focus-visible{outline:2px solid #e0b369;outline-offset:4px}.isv-screen{aspect-ratio:16/9;position:relative;background:#000;overflow:hidden;min-height:200px}.isv-screen>iframe,.isv-screen>video{display:block;border:0;width:100%;height:100%;object-fit:contain}.isv-screen>div{height:100%}.isv-controls{position:relative;background:linear-gradient(#15191f,#0d1015);padding:9px 17px 13px;color:#eceff2}.isv-seek{display:block;position:relative;margin-bottom:7px}.isv-seek>input{width:100%;height:22px;appearance:none;background:transparent;margin:0;display:block;cursor:pointer}.isv-seek>input::-webkit-slider-runnable-track{height:4px;border-radius:6px;background:linear-gradient(to right,#e7b86c 0 var(--played,0%),#858b92 var(--played,0%) var(--buffered,0%),#343a42 var(--buffered,0%) 100%)}.isv-seek>input::-webkit-slider-thumb{appearance:none;width:12px;height:12px;border-radius:50%;background:#f0c27b;margin-top:-4px;box-shadow:0 0 10px #f2b56855}.isv-seek>input:hover::-webkit-slider-runnable-track{height:6px}.isv-seek>output{position:absolute;left:50%;bottom:27px;background:#151a22;padding:6px 10px;border-radius:7px;font-size:12px;pointer-events:none}.isv-seek>output:empty{display:none}.isv-control-row{display:flex;align-items:center;gap:6px}.isv-control-row>button,.isv-titlebar>button{flex-shrink:0;background:transparent;border:0;color:#e5e8ec;border-radius:12px;display:flex;align-items:center;justify-content:center;position:relative;width:40px;height:40px;padding:8px;margin:0;transform:none!important;box-shadow:none}.isv-control-row>button:hover,.isv-titlebar>button:hover{background:#ffffff15;color:white}.isv-control-row svg,.isv-titlebar svg{width:24px;height:24px;fill:none;stroke:currentColor;stroke-width:1.9;stroke-linejoin:round;stroke-linecap:round}.isv-control-row [data-media-toggle] path[d^="M9"]{fill:currentColor;stroke:none}.isv-control-row>button>small{position:absolute;font-size:8px;color:inherit;bottom:13px;left:14px}.isv-volume{width:65px!important;min-width:35px;padding:0!important;height:25px;background:transparent;accent-color:#e5b974}.isv-time{display:flex;gap:7px;align-items:center;white-space:nowrap;font-size:12px;margin-left:6px;color:#d5dbe0;font-variant-numeric:tabular-nums}.isv-time>span{color:#66717c}.isv-speed{margin-left:auto}.isv-speed select{color:#e6e9ed;background:#ffffff08;border:0;border-radius:9px;padding:8px;font-size:13px;min-height:0;max-width:80px}.isv-titlebar{display:none;align-items:center;gap:20px;justify-content:space-between;padding:14px 22px;background:#10141b;flex-shrink:0}.isv-titlebar>b{font-size:16px;font-weight:500;line-height:1.5}.isv-titlebar>button{width:auto;gap:10px;font-size:12px;padding:8px 12px;white-space:nowrap}.isk-video-shell:fullscreen,.isk-video-shell.is-theater{border:0;border-radius:0;background:#000;display:flex;flex-direction:column;width:100%;height:100%;max-width:none;margin:0}.isk-video-shell.is-theater{position:fixed;inset:0;z-index:2147483645;width:100vw;height:100dvh}.isk-video-shell:fullscreen .isv-screen,.isk-video-shell.is-theater .isv-screen{aspect-ratio:auto;flex:1;min-height:0}.isk-video-shell:fullscreen .isv-titlebar,.isk-video-shell.is-theater .isv-titlebar{display:flex}.isk-video-shell:fullscreen .isv-controls,.isk-video-shell.is-theater .isv-controls{flex-shrink:0;padding:10px 28px 16px}.isk-video-shell:fullscreen .isv-control-row,.isk-video-shell.is-theater .isv-control-row{gap:12px}.isk-video-shell:fullscreen .isv-volume{width:110px!important}.tray-video-list:has(.tray-video-card:nth-child(2)){grid-template-columns:1fr!important}.tray-video-card{max-width:1180px}.sr-only{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.lesson-video>.isk-video-shell{max-width:1180px;margin:20px 0}.isv-screen .tray-video-start{inset:0}.isv-screen video{border-radius:0!important;margin:0!important}
@media(max-width:650px){.isv-control-row{gap:1px}.isv-control-row>button{width:32px;height:35px;padding:6px}.isv-volume{display:none}.isv-time{font-size:10px;margin-left:1px;gap:3px}.isv-controls{padding:5px 8px 9px}.isv-titlebar>b{font-size:13px}.isv-titlebar>button span{display:none}.isv-control-row>button>small{left:11px;bottom:12px;font-size:7px}}
.isk-video-shell:not(:fullscreen):not(.is-theater) .isv-screen{max-height:58vh}.video-in-view .lesson-action-dock{visibility:hidden;pointer-events:none}.video-study-return{margin-bottom:24px;font-size:13px}.tray-video-info{position:relative}
.isv-body{display:flex;min-height:0;flex:1;overflow:hidden}.isv-body>.isv-screen{width:100%;min-width:0;flex:1}.isv-chapters[hidden]{display:none}.isv-chapters{width:300px;flex-shrink:0;background:#11171e;overflow:auto;border-left:1px solid #ffffff17;max-height:58vh}.isv-chapters .isv-chapter-header{display:flex;align-items:center;justify-content:space-between;padding:15px 18px;position:sticky;top:0;background:#11171e;z-index:1}.isv-chapters .isv-chapter-header b{font-size:15px;color:#eac58a}.isv-chapters button{border:0;box-shadow:none;transform:none!important;border-radius:12px}.isv-chapters .isv-chapter-header button{background:#ffffff0a;color:white;padding:4px 11px;font-size:22px}.isv-chapters [data-media-chapter]{display:flex;align-items:center;gap:12px;width:calc(100% - 16px);margin:4px 8px;padding:14px 12px;text-align:left;background:transparent;color:#acb8c5;font-size:13px;line-height:1.5}.isv-chapters [data-media-chapter] time{font-size:11px;min-width:34px;color:#ddb16a}.isv-chapters [data-media-chapter] i{margin-left:auto;font-size:9px;font-style:normal;opacity:0}.isv-chapters [data-media-chapter]:hover{background:#ffffff09}.isv-chapters [data-media-chapter].active{background:#e7b8691c;color:#f1d6ac}.isv-chapters [data-media-chapter].active i{opacity:1}.isv-topic-row{background:#121820;border-top:1px solid #ffffff0b;flex-shrink:0}.isv-topic-row>button{display:flex;align-items:center;gap:16px;width:100%;padding:11px 19px;background:transparent;border:0;box-shadow:none;border-radius:0;color:#aab6c4;text-align:left;transform:none!important}.isv-topic-row>button>span:first-child{white-space:nowrap;color:#eac17e;font-size:12px}.isv-topic-row b{font-size:12px;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.isv-topic-row>button>span:last-child{margin-left:auto}.isv-chapter-ticks{position:absolute;left:0;right:0;top:9px;height:4px;pointer-events:none}.isv-chapter-ticks i{position:absolute;top:0;height:4px;width:3px;background:#10151c}.isv-seek>output{transform:translateX(-50%);max-width:320px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.isk-video-shell:fullscreen .isv-chapters,.isk-video-shell.is-theater .isv-chapters{max-height:none;width:340px}.isk-video-shell:fullscreen .isv-screen,.isk-video-shell.is-theater .isv-screen{height:100%}.isk-video-shell:fullscreen .isv-topic-row,.isk-video-shell.is-theater .isv-topic-row{flex-shrink:0}
@media(max-width:800px){.isv-body{flex-direction:column}.isv-chapters{width:100%!important;max-height:180px!important;border-left:0;border-top:1px solid #ffffff17}.isv-chapters .isv-chapter-header{padding:8px 15px}.isv-chapters [data-media-chapter]{padding:8px 12px}.isv-topic-row>button{gap:10px}}
.isv-chapter-note{font-size:11px;line-height:1.6;color:#7f8d9b;margin:0;padding:0 18px 12px}.isv-seek>input{position:relative;z-index:1}.isv-chapter-ticks{z-index:2}