:root{font-family:"Segoe UI",Arial,sans-serif;color:#122538;background:#fff;font-synthesis:none;--teal:#0f766e;--border:#d1d9e1;--muted:#64748b;--navy:#122538}
*{box-sizing:border-box}body{margin:0;min-height:100vh;display:flex;flex-direction:column}button,input,textarea,select{font:inherit}button{cursor:pointer;font-weight:600;border:1px solid transparent;border-radius:6px;padding:13px 23px;transition:background .15s,color .15s}button:disabled{opacity:.46;cursor:not-allowed}button:not(:disabled):hover{filter:brightness(.96)}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible,canvas:focus-visible{outline:3px solid #14b8a6;outline-offset:3px}button.primary{background:var(--teal);color:white}button.outline{border-color:var(--teal);background:#fff;color:var(--teal)}button.text-button{background:transparent;color:var(--teal)}button.small{padding:8px 18px;font-size:14px}input{width:100%;border:1px solid #adbcc9;border-radius:5px;background:#fff;padding:12px 13px;color:var(--navy);min-width:0}label{display:block;font-weight:600;font-size:14px;margin-bottom:8px}a{color:inherit}h1,h2,p{margin-top:0}h1{font-size:48px;line-height:1.2;letter-spacing:-1.15px;margin-bottom:9px;font-weight:700}h2{font-size:23px;line-height:1.25;letter-spacing:-.45px;margin-bottom:9px}p{line-height:1.5}.header{height:70px;padding:0 max(32px,calc((100vw - 1373px)/2));display:flex;align-items:center;border-bottom:1px solid #e0e5ea;gap:58px}.brand{text-decoration:none;font-size:26px;letter-spacing:-.7px;font-weight:700;white-space:nowrap}.header nav{display:flex;align-self:stretch;gap:32px}.nav-button{border-radius:0;background:none;padding:0;font-size:16px;font-weight:400;color:var(--navy);border-bottom:4px solid transparent;margin-top:4px}.nav-button.selected{border-bottom-color:var(--teal)}.account{margin-left:auto;display:flex;align-items:center;gap:24px;font-size:14px}.account>span{max-width:160px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.account .text-button{border-left:1px solid var(--border);border-radius:0;padding:0 0 0 24px;font-weight:500}main{width:min(1373px,calc(100% - 88px));margin:42px auto 0;flex:1}.intro{font-size:22px;line-height:1.55;color:#475569;margin-bottom:24px}.toolbar{display:flex;gap:14px;align-items:center;flex-wrap:wrap;margin-bottom:26px}.toolbar button{font-size:18px;padding:14px 28px}.toolbar .primary{min-width:188px}.browser-frame{border:1px solid #bac8d5;border-radius:6px;overflow:hidden}.browser-bar{display:flex;justify-content:space-between;gap:16px;align-items:center;min-height:46px;padding:9px 17px;background:#f0f3f6;border-bottom:1px solid var(--border);font-size:16px;color:#56667b}.browser-status{display:flex;align-items:center;gap:11px;min-width:0}.status-dot{width:11px;height:11px;background:#94a3b8;border-radius:50%;flex:none}.status-dot.active{background:var(--teal)}.status-dot.waiting{background:#d49b27}.hostname{flex-shrink:0;font-weight:600;overflow-wrap:anywhere;text-align:right}.browser-stage{position:relative}.empty-state{height:386px;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;padding:25px;color:#5c697a}.empty-state svg{margin-bottom:24px}.empty-state h2{color:var(--navy);font-size:27px}.empty-state p{font-size:18px;color:var(--muted);margin:3px 0 0}canvas{display:block;width:100%;height:auto;background:white;touch-action:none}canvas:focus-visible{outline-offset:-3px}.remote-input{position:absolute;bottom:0;left:50%;width:1px;height:1px;opacity:.01;padding:0;border:0;resize:none;pointer-events:none}.browser-help{display:flex;justify-content:space-between;align-items:center;gap:20px;margin:10px 0 22px}.browser-help p{font-size:16px;color:var(--muted);margin:0}.browser-help button{white-space:nowrap;border-color:var(--border);font-size:16px;padding:8px 22px}.explanation{display:grid;grid-template-columns:1fr 1fr;border-top:1px solid #e0e5ea;padding-top:32px;margin:0 0 30px}.explanation section+section{border-left:1px solid #e0e5ea;padding-left:28px}.explanation section:first-child{padding-right:28px}.explanation p{color:var(--muted);font-size:18px;margin:0}.explanation h2{font-size:27px}.lesson-details{display:flex;flex-wrap:wrap;gap:12px 24px;padding:14px 0;margin-bottom:15px;font-size:14px;color:#475569;border-top:1px solid #e0e5ea}.lesson-details span:empty{display:none}.keyboard-tools{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:20px}.keyboard-tools span{font-size:13px;color:var(--muted);width:100%}footer{border-top:1px solid #e0e5ea;text-align:center;padding:19px 24px;font-size:14px;color:var(--muted)}.login-view{max-width:420px;margin:53px auto 100px}.login-view h1{font-size:38px;max-width:360px}.login-view .intro{font-size:16px;margin-bottom:28px}.login-form label:not(:first-child){margin-top:20px}.login-form .primary{margin-top:24px;width:100%}.login-note{font-size:14px;line-height:1.6;color:var(--muted);border-top:1px solid #e0e5ea;padding-top:23px;margin-top:28px}.error{padding:12px 15px;color:#9f2d28;background:#fff2f1;border:1px solid #fecdc8;border-radius:5px;font-size:14px;margin:15px 0}.notice{padding:12px 15px;background:#edf8f5;color:#116455;border:1px solid #b3dfd4;border-radius:5px;font-size:14px}.loading{color:var(--muted);text-align:center;padding:80px 0}.create-user-form{display:flex;align-items:end;gap:16px;padding:10px 0 0;max-width:900px}.create-user-form>div{flex:1}.create-user-form button{flex:none;white-space:nowrap}.field-note{font-size:12px;color:var(--muted);margin:9px 0 24px}.table-scroll{overflow-x:auto;margin-bottom:60px}table{border-collapse:collapse;width:100%;text-align:left;font-size:15px}th{font-weight:500;color:var(--muted);font-size:13px;padding:13px 16px;background:#f5f7f9}td{padding:16px;border-bottom:1px solid #e0e5ea}th:first-child,td:first-child{padding-left:14px}td:last-child{text-align:right;white-space:nowrap}.user-actions{display:flex;gap:8px;justify-content:flex-end}.user-actions button{font-size:13px;padding:7px 12px}.muted{color:var(--muted)}dialog{width:min(420px,calc(100vw - 32px));padding:28px;border:1px solid var(--border);border-radius:8px;color:var(--navy);box-shadow:0 20px 80px #12253826}dialog::backdrop{background:#12253866}.dialog-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:22px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}[hidden]{display:none!important}
.course-picker{margin:0 0 22px}.course-picker p{font-size:14px;color:var(--muted);margin-bottom:10px}.course-controls{display:flex;gap:10px;align-items:center}.course-controls select{max-width:540px;flex:1;min-width:0;padding:8px 32px 8px 12px;border:1px solid var(--border);border-radius:5px;background:#fff;color:var(--navy);font-size:14px}.course-controls select:disabled{color:var(--muted);background:#f8fafc}.course-controls button{white-space:nowrap}@media(max-width:700px){.course-controls{flex-wrap:wrap}.course-controls select{order:3;flex-basis:100%;width:100%;max-width:none}.course-picker p{font-size:13px}}
@media(min-width:1440px){main{margin-top:44px}}
@media(max-width:700px){.header{height:auto;min-height:66px;padding:16px 20px;gap:20px;flex-wrap:wrap}.brand{font-size:23px}.account{gap:14px}.account>span{max-width:160px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.account .text-button{padding-left:14px}.header nav{order:3;width:100%;height:36px;gap:25px}.nav-button{font-size:14px}.header:has(nav:not([hidden])){padding-bottom:0}main{width:calc(100% - 40px);margin-top:28px}h1{font-size:30px;letter-spacing:-.8px}.intro{font-size:16px;margin-bottom:22px}.toolbar{gap:8px}.toolbar button{padding:11px 15px;font-size:14px}.toolbar .primary{min-width:0}.browser-bar{font-size:12px;padding:9px 10px;gap:8px;align-items:flex-start}.browser-status{gap:7px}.status-dot{width:8px;height:8px;margin-top:4px}.hostname{max-width:45%}.empty-state{height:300px;padding:24px 16px}.empty-state h2{font-size:20px}.empty-state p{font-size:14px;max-width:230px}.empty-state svg{width:60px;margin-bottom:17px}.browser-help{align-items:flex-start;gap:12px}.browser-help p{font-size:12px}.browser-help button{padding:8px 12px;font-size:12px}.explanation{grid-template-columns:1fr;gap:23px;padding-top:23px}.explanation section:first-child{padding-right:0}.explanation section+section{padding-left:0;border-left:none}.explanation h2{font-size:21px}.explanation p{font-size:14px}.login-view{margin:35px auto 70px}.login-view h1{font-size:34px}.create-user-form{display:grid;grid-template-columns:1fr;gap:18px}.create-user-form button{width:max-content}.table-scroll{margin-left:-5px;margin-right:-5px}td,th{padding:13px 10px}td{font-size:14px}.user-actions{flex-direction:column}.user-actions button{padding:6px 9px}footer{font-size:11px;line-height:1.5}}
@media(prefers-reduced-motion:reduce){*{transition:none!important}}