:root{color-scheme:dark;--bg:#080b10;--panel:#0d1118;--line:#242b36;--text:#eef1f6;--muted:#99a5b5;--blue:#388aff;--soft:#14223a;--green:#7ac8ac;--shadow:0 18px 60px #0003}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font:14px -apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif}body.light{color-scheme:light;--bg:#f5f6f8;--panel:#fff;--line:#dce1e9;--text:#182331;--muted:#667185;--soft:#e9f0fe;--green:#237f63;--shadow:0 12px 40px #20305008}button,input,textarea,select{font:inherit}button{cursor:pointer;color:inherit;background:transparent;border:1px solid var(--line);border-radius:10px;padding:11px 15px}button:hover{border-color:var(--blue);background:var(--soft)}button:focus-visible,a:focus-visible{outline:2px solid var(--blue);outline-offset:3px}button.primary{background:var(--blue);border-color:var(--blue);color:#fff;box-shadow:0 4px 22px #247aff22}button:disabled{opacity:.45;cursor:default}input,textarea,select{color:var(--text);background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:12px;width:100%}textarea{min-height:100px;resize:vertical}h1,h2,h3,p{margin:0}h1{font-size:36px;letter-spacing:-1.4px;font-weight:550}h1 em{font-family:Georgia,serif;font-weight:400}h2{font-size:19px;font-weight:550}h3{font-size:15px}p{line-height:1.65}small,.muted{color:var(--muted)}small{font-size:12px}.layout{display:grid;grid-template-columns:220px 1fr;min-height:100vh}.sidebar{padding:30px 18px;border-right:1px solid var(--line);position:sticky;top:0;height:100vh;display:flex;flex-direction:column;gap:32px}.brand{font-size:20px;letter-spacing:-.7px;font-weight:650}.brand i{color:var(--blue);font-style:normal}.brand small{display:block;font-size:11px;font-weight:400;letter-spacing:.5px;margin-top:7px}.nav{display:grid;gap:8px}.nav button{text-align:left;border-color:transparent;display:flex;gap:12px;align-items:center}.nav .active{background:var(--soft);color:var(--blue);border-color:var(--line)}.profile{margin-top:auto;display:flex;gap:10px;align-items:center}.avatar{height:34px;width:34px;border-radius:50%;display:grid;place-items:center;background:var(--soft);color:var(--blue);flex-shrink:0}.shell{min-width:0}.top{padding:18px 38px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:12px}.top select{width:auto;padding:8px}.top button{padding:8px 11px}.demo{font-size:11px;letter-spacing:.4px;color:var(--muted)}main{max-width:1460px;margin:auto;padding:36px 38px 80px}.heading{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:28px}.heading p{margin-top:9px;color:var(--muted)}.grid{display:grid;grid-template-columns:1.5fr 1fr;gap:22px}.card{border:1px solid var(--line);border-radius:16px;background:var(--panel);box-shadow:var(--shadow);padding:22px}.stack{display:grid;gap:18px}.row{display:flex;align-items:center;justify-content:space-between;gap:12px}.badge{display:inline-block;font-size:11px;color:var(--blue);background:var(--soft);border:1px solid var(--line);padding:5px 9px;border-radius:20px;white-space:nowrap}.badge.good{color:var(--green)}.badge.warn{color:#dcae68}.sp{height:20px}.hero{padding:28px;min-height:290px;position:relative;overflow:hidden;background:radial-gradient(ellipse at 95% 35%,#2b497d33,transparent 65%),var(--panel)}.hero>*{position:relative;z-index:1}.hero h2{font-size:30px;max-width:390px;letter-spacing:-1px;margin:30px 0 8px}.ribbon{position:absolute;width:250px;height:250px;border:26px solid #a4b5cd35;border-radius:40% 60% 65% 35%;right:-40px;top:-40px;transform:rotate(-30deg);box-shadow:inset 6px 4px 14px #e4eaff50,6px 3px 16px #0007}.progress{height:5px;background:var(--line);border-radius:9px;margin:14px 0}.progress>span{display:block;height:100%;background:var(--blue);border-radius:9px}.list{display:grid;gap:9px;margin-top:16px}.item{width:100%;display:flex;align-items:center;justify-content:space-between;gap:15px;text-align:left;padding:15px;border:1px solid var(--line);border-radius:10px}.item strong{font-weight:500;display:block;margin-bottom:5px}.module{border:1px solid var(--line);border-radius:13px;margin-bottom:12px;overflow:hidden;background:var(--panel)}.module-head{display:flex;align-items:center;width:100%;gap:14px;border:none;border-radius:0;text-align:left;padding:18px}.module-head .count{margin-left:auto;color:var(--muted);font-size:12px}.module-content{padding:0 14px 14px}.number{color:var(--muted);font-size:12px;min-width:25px}.workspace{display:grid;grid-template-columns:290px minmax(0,1fr);gap:24px}.workspace .module-head{padding:15px}.player{border:1px solid var(--line);border-radius:15px;overflow:hidden;background:#070b13;color:#eaf0ff}.stage{aspect-ratio:16/9;display:grid;place-items:center;position:relative;background:radial-gradient(ellipse at 50% 20%,#23407366,transparent 65%)}.art{font:italic 100px Georgia;color:#cdd8eb;letter-spacing:-12px;text-shadow:4px 9px 1px #536078,12px 20px 20px #000;transform:rotate(-8deg)}.play{position:absolute;inset:0;display:grid;place-items:center}.play button{border-radius:50%;width:64px;height:64px;background:#121b29b8;border-color:#7c8da4;font-size:25px}.controls{padding:14px 18px;border-top:1px solid #29323f}.controls input{padding:0;accent-color:#388aff;margin-bottom:10px}.controls .row{font-size:12px}.controls button{padding:4px 9px;color:#fff;border-color:#364152}.network{padding:12px 16px;font-size:12px;background:var(--soft);color:var(--blue);border-radius:9px;margin-top:12px}.tabs{display:flex;gap:10px;border-bottom:1px solid var(--line);margin:24px 0 20px}.tabs button{border:none;border-radius:0;color:var(--muted);padding:13px}.tabs button.active{color:var(--blue);border-bottom:2px solid var(--blue)}.actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-bottom:24px}.stat strong{display:block;font-size:34px;font-weight:500;margin:8px 0}.table{width:100%;border-collapse:collapse}.table td,.table th{text-align:left;padding:15px 8px;border-bottom:1px solid var(--line)}.table th{color:var(--muted);font-size:11px;font-weight:400}.table button{padding:7px 10px}.empty{text-align:center;padding:40px 20px;color:var(--muted)}.lock{text-align:center;padding:50px 25px;background:radial-gradient(ellipse,#214e7e22,transparent)}.lock .art{font-size:70px;margin-bottom:40px}.label{display:block;font-size:12px;color:var(--muted);margin:16px 0 8px}.toast{position:fixed;bottom:28px;left:50%;transform:translateX(-50%);background:var(--text);color:var(--bg);padding:13px 22px;border-radius:12px;box-shadow:var(--shadow);z-index:20;max-width:90vw}.smallnote{font-size:11px;color:var(--muted);margin-top:12px;line-height:1.5}dialog{background:var(--panel);color:var(--text);border:1px solid var(--line);border-radius:18px;max-width:440px;width:90vw;padding:24px}dialog::backdrop{background:#0009}dialog h2{margin-bottom:12px}button.link{border:none;color:var(--blue);padding:5px}.bottom{display:none}
@media(min-width:1600px){main{padding-top:50px}.hero{min-height:330px}}@media(max-width:1050px){.layout{grid-template-columns:180px 1fr}.sidebar{padding:25px 12px}.top{padding:16px 22px}main{padding:28px 22px 90px}.grid{grid-template-columns:1fr}.workspace{grid-template-columns:230px 1fr}h1{font-size:29px}}@media(max-width:720px){.layout{display:block}.sidebar{display:none}.top{padding:14px 16px}.top .demo{max-width:130px}.top select{max-width:125px;font-size:12px}main{padding:24px 16px 100px}.heading{align-items:flex-start}.heading h1{font-size:29px}.heading p{font-size:12px}.workspace{display:flex;flex-direction:column}.workspace aside{order:2}.workspace article{order:1}.stats{gap:8px}.stat{padding:13px}.stat strong{font-size:27px}.stat small{font-size:10px}.card{padding:17px}.hero{padding:24px}.hero h2{font-size:28px}.bottom{display:flex;position:fixed;bottom:0;background:var(--panel);border-top:1px solid var(--line);left:0;right:0;padding:9px 8px max(9px,env(safe-area-inset-bottom));z-index:5;justify-content:space-around}.bottom button{border:0;font-size:11px;padding:10px 7px}.bottom .active{color:var(--blue);background:var(--soft)}.table th:nth-child(2),.table td:nth-child(2){display:none}.art{font-size:78px}.toast{bottom:85px}.actions button{flex:1}.row.wrap{flex-wrap:wrap}}
.course-logo{display:block;width:100%;height:105px;object-fit:contain;background:#000;border-radius:10px}.top-brand{display:flex;align-items:center;gap:14px}.top-brand .course-logo{width:132px;height:76px}.seek-buttons{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;margin-top:12px}.seek-buttons button{min-width:55px;min-height:40px;padding:8px}.connection-overlay{position:absolute;bottom:14px;left:14px;right:14px;text-align:center;background:#111c2de8;padding:9px;border-radius:8px;font-size:12px}.top{padding-top:8px;padding-bottom:8px}@media(max-width:720px){.top-brand{gap:5px}.top-brand .course-logo{width:86px;height:54px}.top-brand .demo{font-size:9px}.top{gap:6px}.top .row{gap:6px}.top select{max-width:113px}.seek-buttons{gap:6px}.seek-buttons button{flex:1}}
.brand-lockup{display:inline-flex;align-items:center;gap:10px;isolation:auto}.brand-symbol{display:block;position:relative;overflow:hidden;width:48px;height:28px;flex:0 0 48px;mix-blend-mode:screen}.brand-symbol img{position:absolute;width:35px;max-width:none;height:auto;left:50%;top:50%;transform:translate(-50%,-50%)}.light .brand-symbol{mix-blend-mode:multiply}.light .brand-symbol img{filter:invert(1)}.brand-wordmark{font-size:12px;font-weight:750;letter-spacing:.4px;white-space:nowrap}.brand-wordmark small,.brand .brand-wordmark small{display:block;margin-top:4px;font-size:10px;line-height:1.1;letter-spacing:1.8px;font-weight:400;color:var(--muted)}.top{min-height:72px}.sidebar .brand-lockup{gap:6px}.sidebar .brand-wordmark{font-size:11px}@media(max-width:720px){.top-brand .demo{display:none}.brand-lockup{gap:6px}.brand-symbol{width:35px;height:23px;flex-basis:35px}.brand-symbol img{width:25.9px}.brand-wordmark{font-size:10px;letter-spacing:0}.brand-wordmark small{font-size:9px}.top select{max-width:104px}}
/* Content wraps and grows instead of escaping narrow containers. */
.top,.top-brand,.heading,.row,.item,.module-head,.tabs{flex-wrap:wrap}
.top>*,.heading>*,.row>*,.item>*,.module-head>*,.grid>*,.stack>*,.workspace>*,.stats>*{min-width:0;max-width:100%}
.top>.row{margin-left:auto;flex:0 1 auto;justify-content:flex-end}
.top select,.top #role{max-width:100%;width:auto;min-width:145px;flex:1 1 145px}
.top .row>button{flex:0 0 40px;min-height:40px}
p,h1,h2,h3,strong,small,button,td,th,.badge{overflow-wrap:anywhere}
button{white-space:normal}.badge{white-space:normal}.table{table-layout:fixed}.table td,.table th{overflow-wrap:anywhere}
.grid{grid-template-columns:minmax(0,1.5fr) minmax(0,1fr)}.stats{grid-template-columns:repeat(3,minmax(0,1fr))}
.workspace{grid-template-columns:minmax(0,290px) minmax(0,1fr)}.workspace article{width:100%}
.bottom{flex-wrap:wrap}.bottom button{min-width:0;flex:1 1 60px}.sidebar{overflow-y:auto}.art{font-size:clamp(38px,8vw,100px);max-width:90%;letter-spacing:-5px}
@media(max-width:1050px){.grid{grid-template-columns:minmax(0,1fr)}.workspace{grid-template-columns:minmax(0,210px) minmax(0,1fr)}}
@media(max-width:720px){.top{gap:14px}.top>.row{flex:1 1 190px}.top select,.top #role{min-width:145px;max-width:100%}.workspace{display:flex}.stats{grid-template-columns:repeat(auto-fit,minmax(min(100%,125px),1fr))}.heading{gap:12px}.controls .row{gap:10px}.actions button{flex:1 1 130px}.tabs button{flex:1 1 90px}.item{gap:10px}.module-head .count{margin-left:0}.brand-wordmark{white-space:normal}}

.notice{white-space:pre-wrap;line-height:1.6}.top .identity{overflow-wrap:anywhere;max-width:240px}.error{color:#df7b7b}.module-content:empty{display:none}
.nav svg,.bottom svg{width:22px;height:22px;flex:none}.bottom button{display:flex;flex-direction:column;align-items:center;gap:6px}.lesson-media{margin:16px 0;min-width:0}.lesson-media video,.lesson-media audio,.lesson-media img{display:block;width:100%;max-width:100%;border-radius:12px}.lesson-media video{max-height:70vh;background:#000}.media-status{color:var(--muted);margin-top:8px}.tabs [aria-pressed=true]{color:var(--blue);border-bottom:2px solid var(--blue)}
.video-frame{position:relative;isolation:isolate;background:#000;border-radius:14px;overflow:hidden;color:#fff;min-width:0;aspect-ratio:16/9}.lesson-media .video-frame video{width:100%;height:100%;max-height:none;border-radius:0;object-fit:contain}.video-center{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;gap:clamp(12px,4vw,36px);pointer-events:none}.video-center button{display:grid;place-items:center;pointer-events:auto;color:#fff;border:1px solid #ffffff70;background:#36333b65;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-radius:50%;padding:10px;min-width:44px;min-height:44px;box-shadow:inset 0 1px 2px #fff3}.video-center .glass-skip{width:clamp(44px,8vw,62px);height:clamp(44px,8vw,62px)}.video-center .glass-play{width:clamp(54px,11vw,84px);height:clamp(54px,11vw,84px)}.video-center svg{width:100%;height:100%;max-width:40px}.video-bottom{position:absolute;bottom:0;left:0;right:0;padding:8px 12px 10px;background:linear-gradient(transparent,#0009)}.video-options{display:flex;justify-content:flex-end;gap:6px;margin-bottom:6px;align-items:center}.video-options button,.video-options select{color:#fff;background:#2227;border:1px solid #ffffff45;width:auto;padding:5px 8px;font-size:12px;min-height:32px;border-radius:9px}.video-options option{background:#222}.video-timeline{display:flex;align-items:center;gap:9px;padding:8px 12px;border-radius:24px;background:#ffffff32;backdrop-filter:blur(12px);font-size:12px;font-variant-numeric:tabular-nums}.video-timeline input{min-width:0;flex:1;width:0;padding:0;accent-color:#fff;height:16px}.video-center,.video-bottom{transition:opacity .2s}.controls-hidden .video-center,.controls-hidden .video-bottom{opacity:0;pointer-events:none}.controls-hidden .video-center button{pointer-events:none}.video-frame:focus-visible{outline:2px solid var(--blue)}.video-frame:fullscreen{border-radius:0;aspect-ratio:auto;width:100vw;height:100vh}.video-frame:fullscreen .video-bottom{padding:16px max(16px,env(safe-area-inset-right)) max(16px,env(safe-area-inset-bottom))}.video-frame:fullscreen .video-center button{width:76px;height:76px}.video-frame:fullscreen .glass-play{width:100px;height:100px}@media(max-width:480px){.video-bottom{padding:4px 7px 7px}.video-options{margin-bottom:4px}.video-options button,.video-options select{padding:3px 7px;min-height:28px}.video-timeline{padding:4px 8px;font-size:10px}.video-center{padding-bottom:30px}}

.video-center,.video-bottom{transition:opacity .28s ease}.video-frame:fullscreen .video-bottom{left:max(20px,env(safe-area-inset-left));right:max(20px,env(safe-area-inset-right));bottom:max(20px,env(safe-area-inset-bottom));padding:10px;border-radius:18px}.video-center button{flex-shrink:0;overflow:hidden}.video-center svg{display:block;flex-shrink:0;overflow:visible;max-width:32px;max-height:32px}.video-center .glass-play svg{max-width:36px;max-height:36px}.video-frame:fullscreen .video-center svg{max-width:36px;max-height:36px}.video-timeline>span{flex-shrink:0}@media(prefers-reduced-motion:reduce){.video-center,.video-bottom{transition:none}}