:root{--bg:#111315;--surface:#191c1f;--terminal:#0c0e10;--line:#303438;--text:#edf0ec;--muted:#a3a9ad;--green:#c6f56d;--red:#ffa2a2}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font:14px/1.6 Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}button,input,textarea{font:inherit}button,a,input,textarea{outline-offset:4px}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible{outline:2px solid var(--green)}button{cursor:pointer}button:disabled{cursor:wait;opacity:.55}button,a{transition:background .15s,color .15s,border-color .15s}a{color:inherit;text-decoration:none}button{color:inherit}button[hidden],[hidden]{display:none!important}.topbar{height:82px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 4.5vw}.brand{display:flex;align-items:center;font-size:25px;letter-spacing:-1.3px;font-weight:750}.brand-light{font-weight:400;color:#c1c6c9}.brand-mark{background:var(--green);color:#1b2510;border-radius:9px;font:700 23px/39px monospace;width:42px;height:39px;text-align:center;margin-right:11px;letter-spacing:-3px;padding-right:4px}.pill{font-size:9px;letter-spacing:1.4px;border:1px solid #414840;color:#bdc8b5;border-radius:4px;padding:3px 7px;margin-left:15px}.top-actions{display:flex;gap:18px;align-items:center}.live{font-size:12px;color:#c0c8bf;display:flex;gap:8px;align-items:center}.live i,.status-dot{display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--green)}main{max-width:1550px;margin:auto;padding:0 4.5vw}.eyebrow,.small-label{font-size:10px;font-weight:650;letter-spacing:1.9px;color:var(--muted)}.eyebrow{margin-bottom:10px}.page-heading{display:flex;justify-content:space-between;align-items:center;padding:38px 0 28px}h1,h2,h3,p{margin:0}h1{font-size:36px;letter-spacing:-1.4px;font-weight:600;line-height:1.25}.page-heading p{color:var(--muted);margin-top:10px;font-size:13px}.green{color:var(--green)}.muted{color:var(--muted)}.primary{display:inline-flex;align-items:center;justify-content:center;gap:25px;min-height:42px;border:1px solid var(--green);background:var(--green);color:#17200c;border-radius:7px;padding:9px 17px;font-size:12px;font-weight:700}.primary:hover{background:#d9ffa0}.secondary{background:var(--surface);border:1px solid #41463f;border-radius:7px;padding:10px 16px;font-size:12px;min-height:44px}.secondary:hover{border-color:var(--green)}.quiet{background:transparent;border:0;color:#b7bec1;font-size:12px;min-height:40px;padding:7px 10px;border-radius:5px}.quiet:hover{background:#282d30;color:var(--text)}.danger{color:#dca6a0}.workspace-grid{display:grid;grid-template-columns:minmax(0,1fr) 295px;gap:22px}.terminal-card{border:1px solid #363c3b;border-radius:12px;overflow:hidden;background:var(--terminal);min-width:0}.terminal-bar{height:51px;padding:0 17px;background:#1b1e21;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between}.terminal-title{display:flex;gap:14px;align-items:center;font:12px ui-monospace,monospace}.terminal-dots{display:flex;gap:6px;margin-right:6px}.terminal-dots i{display:block;height:8px;width:8px;background:#f07d70;border-radius:50%}.terminal-dots i:nth-child(2){background:#dfbb65}.terminal-dots i:nth-child(3){background:#8bc67d}.version{font-size:10px;color:#838d92;border-left:1px solid #41464a;padding-left:13px}.toolbar{display:flex;gap:7px}.terminal-scroll{height:310px;overflow:auto;padding:26px 25px 12px;font:12px/1.85 ui-monospace,SFMono-Regular,Consolas,monospace;scrollbar-color:#414841 transparent}.ascii{font:700 25px ui-monospace,monospace;color:var(--green);letter-spacing:-1px;margin:0 0 15px}.welcome{color:#e0e7df}.output-block{margin:14px 0 24px;overflow-wrap:anywhere}.output-command{color:var(--green);white-space:pre-wrap}.output-text{white-space:pre-wrap;margin:5px 0 0;font:inherit;color:#d7dce0;overflow-wrap:anywhere}.output-exit{font-size:10px;color:var(--red)}.command-area{margin:0 16px 15px;border:1px solid #333b35;border-radius:8px;background:#131719;padding:12px 14px}.prompt{font:11px ui-monospace,monospace;color:var(--green);overflow-wrap:anywhere}textarea{background:transparent;color:#e6ece2;border:0;resize:vertical;width:100%;min-height:54px;max-height:240px;padding:9px 0;font:13px/1.7 ui-monospace,monospace}textarea:focus{outline:none}textarea::placeholder{color:#75807d}.command-bottom{display:flex;align-items:center;justify-content:space-between;gap:10px}.keyboard-hint{color:#8c9696;font-size:9px;display:flex;align-items:center;gap:5px;flex-wrap:wrap}kbd{font:9px ui-monospace,monospace;color:#b5bfbb;background:#22292a;padding:1px 5px;border:1px solid #3a4343;border-radius:3px}.terminal-status{display:flex;justify-content:space-between;gap:8px;padding:10px 18px;border-top:1px solid #272e2b;font-size:9px;color:#969f9c;background:#141917}.terminal-status .status-dot{margin-right:5px}.sidebar{display:flex;flex-direction:column;gap:17px}.panel{border:1px solid var(--line);border-radius:10px;background:var(--surface);overflow:hidden}.panel-heading{display:flex;align-items:center;justify-content:space-between;padding:9px 16px;border-bottom:1px solid var(--line)}.panel-heading h2{font-size:12px;font-weight:600}.icon-button{background:none;border:0;color:var(--muted);font-size:22px;width:40px;height:40px;border-radius:5px}.icon-button:hover{background:#2e3435;color:var(--green)}.home-path{font:10px ui-monospace,monospace;display:flex;align-items:center;gap:8px;padding:14px 16px;background:#202527;color:#bcc8bd}.tag{font:8px system-ui,sans-serif;color:var(--green);border:1px solid #50613d;border-radius:3px;padding:1px 4px;margin-left:auto;letter-spacing:1px}.file-list{height:165px;overflow:auto;padding:9px 6px}.file-row{display:flex;align-items:center;gap:8px;text-align:left;border:0;width:100%;padding:5px 10px;background:transparent;font:11px/1.7 ui-monospace,monospace;border-radius:4px}.file-row:hover{background:#29302d}.file-row .file-icon{color:#8aa77a}.file-name{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.file-size{font-size:9px;color:#8d9894;margin-left:auto;white-space:nowrap}.panel-footer{display:flex;justify-content:space-between;padding:10px 14px;border-top:1px solid var(--line);font-size:9px;color:var(--muted)}.text-link{color:var(--green)}.tip-panel{padding:18px;background:linear-gradient(130deg,#20271e,#191e1b)}.tip-panel .small-label{color:#a8bb99;font-size:9px}.tip-panel h3{font-size:16px;margin:9px 0 8px;font-weight:550}.tip-panel p{font-size:11px;color:#b0bcae;line-height:1.85}.tip-command{background:#141a13;display:flex;align-items:center;justify-content:space-between;border:1px solid #35422d;border-radius:5px;margin-top:16px;padding-left:9px;gap:3px}.tip-command code{font-size:9px;color:#c3d1b8}.tip-command button{min-height:36px;min-width:32px;border:0;background:transparent;color:var(--green);font-size:18px}.help-link{border:0;background:none;display:flex;justify-content:space-between;text-align:left;color:var(--muted);font-size:11px;min-height:30px;padding:0 3px}.help-link:hover{color:var(--green)}.exercises{margin-top:31px}.section-title{display:flex;align-items:end;justify-content:space-between;gap:15px;margin-bottom:18px}.section-title h2{font-size:20px;letter-spacing:-.5px;margin-top:5px;font-weight:550}.section-title>.muted{font-size:10px}.exercise-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:15px}.exercise{background:var(--surface);border:1px solid var(--line);border-radius:9px;padding:18px;text-align:left}.exercise:hover{border-color:#839c63;background:#20271f}.exercise-number{font:11px ui-monospace,monospace;color:var(--green);display:flex;gap:12px;align-items:center}.exercise-number span{color:#8d9992;font:8px system-ui,sans-serif;letter-spacing:1.8px}.exercise h3{display:flex;justify-content:space-between;font-size:13px;font-weight:550;margin:15px 0 8px;gap:6px}.exercise h3 span{color:#a7b49c}.exercise p{font-size:11px;color:var(--muted);min-height:36px}.exercise code{font-size:10px;color:#b2bfa9;display:block;margin-top:15px}footer{border-top:1px solid var(--line);display:flex;justify-content:space-between;margin:32px 0 0;padding:20px 0 25px;color:#9ca4a0;font-size:10px}.auth-layout{display:grid;grid-template-columns:1.1fr 1fr;max-width:1060px;margin:65px auto 45px;gap:95px;align-items:center}.auth-intro h1{font-size:58px;font-weight:500;letter-spacing:-2.6px;line-height:1.12;margin:20px 0 24px}.auth-intro h1>span{color:var(--green)}.auth-intro>p{font-size:14px;line-height:1.9;color:var(--muted)}.intro-terminal{font:12px/2.2 ui-monospace,monospace;margin:35px 0;padding:19px;border-left:2px solid #71894f;background:linear-gradient(90deg,#1c2219,transparent)}.intro-foot{display:flex;gap:16px;font-size:9px;color:#abb5a5}.auth-card{background:#1a1e20;padding:32px;border:1px solid #363c38;border-radius:14px;box-shadow:0 30px 80px #0003}.auth-card h2{font-size:28px;font-weight:550;letter-spacing:-.8px;margin:9px 0}.auth-card>p{color:var(--muted);font-size:12px}.auth-tabs{display:flex;border-bottom:1px solid var(--line);margin:25px 0;gap:20px}.auth-tabs button{border:0;border-bottom:2px solid transparent;background:none;color:var(--muted);padding:10px 0;font-size:11px;min-height:44px}.auth-tabs .selected{color:var(--green);border-color:var(--green)}label{display:flex;flex-direction:column;gap:7px;font-size:12px;margin-bottom:17px;color:#d2d9d2}input{min-height:44px;border:1px solid #414a44;border-radius:6px;padding:10px 12px;background:#111616;color:var(--text);width:100%;font-size:13px}input::placeholder{color:#85908a}.error{font-size:12px;color:var(--red);margin:10px 0;min-height:8px}.wide{width:100%;justify-content:space-between;min-height:47px}.auth-note{font-size:10px;color:#a2ada6;line-height:1.9;margin-top:22px;padding-top:17px;border-top:1px solid var(--line)}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}dialog{background:#1b2021;color:var(--text);border:1px solid #465044;border-radius:12px;padding:22px;width:min(760px,94vw);max-height:85vh}dialog::backdrop{background:#000a;backdrop-filter:blur(4px)}.modal-head{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line);padding-bottom:10px;margin-bottom:20px}.modal-head h2{font-size:20px}.modal-body p{color:var(--muted)}#modalBody pre{white-space:pre-wrap;overflow-wrap:anywhere;font:12px/1.8 ui-monospace,monospace}#modalBody h3{margin:18px 0 10px;font-size:14px}#modalBody .secondary{margin:8px 0}#modalBody table{border-collapse:collapse;width:100%;font-size:12px}#modalBody td,#modalBody th{padding:11px 7px;text-align:left;border-bottom:1px solid var(--line)}#modalBody td button{font-size:10px}.invite-box{display:flex;gap:15px;align-items:center;flex-wrap:wrap;margin:14px 0}.invite-code{font:24px ui-monospace,monospace;color:var(--green);letter-spacing:3px}#toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%);padding:12px 20px;border-radius:7px;background:var(--green);color:#18200f;font-size:12px;max-width:90vw;z-index:20}.account-form{max-width:400px}.form-note{font-size:12px;color:var(--muted);margin-bottom:20px}.empty-state{font-size:12px;color:var(--muted);padding:20px}.table-wrap{overflow-x:auto}@media(min-width:1550px){main{padding-left:65px;padding-right:65px}}@media(max-width:1050px){.workspace-grid{grid-template-columns:minmax(0,1fr) 250px;gap:15px}.exercise-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.auth-layout{gap:40px}.auth-intro h1{font-size:48px}.keyboard-hint{font-size:8px;max-width:240px}.topbar{padding:0 4vw}main{padding:0 4vw}}@media(max-width:760px){.topbar{height:67px}.brand{font-size:22px}.pill,.live{display:none}.top-actions{gap:3px}.top-actions .quiet{font-size:11px;max-width:115px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.brand-mark{width:35px;height:35px;line-height:35px}.page-heading{padding:26px 0 21px;gap:10px;align-items:start}.page-heading h1{font-size:29px}.page-heading p{font-size:11px}.page-heading .secondary{font-size:10px;padding:7px 9px}.workspace-grid{grid-template-columns:1fr}.sidebar{display:grid;grid-template-columns:1fr 1fr;gap:12px}.file-list{height:145px}.tip-panel{padding:15px}.tip-command code{font-size:8px}.help-link{grid-column:1/-1}.terminal-scroll{height:300px;padding:22px 17px}.terminal-bar{padding:0 10px}.version{display:none}.terminal-status{font-size:8px;padding:10px}.section-title{align-items:start}.section-title>.muted{display:none}.exercise{padding:15px}.exercise h3{font-size:12px}footer{gap:15px;font-size:9px}.auth-layout{grid-template-columns:1fr;margin:30px auto;gap:30px;max-width:460px}.auth-intro h1{font-size:38px}.auth-intro h1 br{display:none}.auth-intro h1{margin:12px 0}.auth-intro>p{font-size:12px}.intro-terminal,.intro-foot{display:none}.auth-card{padding:25px}.auth-intro .eyebrow{font-size:8px}}@media(max-width:420px){.sidebar{grid-template-columns:1fr}.exercise-grid{gap:9px}.keyboard-hint{max-width:180px}.exercise-number span{font-size:7px;letter-spacing:1px}.terminal-title{gap:8px}.terminal-dots{gap:4px}.terminal-status{flex-wrap:wrap}.tip-panel{display:none}footer>span:last-child{display:none}}@media(prefers-reduced-motion:reduce){*,*::before,*::after{transition:none!important;scroll-behavior:auto!important}}
.terminal-scroll{height:385px;padding:13px 8px 8px 17px}.terminal-scroll #liveTerminal{height:100%;width:100%}.terminal-shortcuts{display:flex;align-items:center;gap:8px;border-top:1px solid #252b28;padding:2px 10px;flex-wrap:wrap}.terminal-shortcuts>span{font-size:9px;color:var(--muted);margin-left:auto}.terminal-shortcuts .quiet{font-size:10px;min-height:32px}.extra-exercises{margin-top:15px}.command-area{margin-top:8px}.command-area textarea{min-height:40px;font-size:12px}.file-list{height:200px}.xterm .xterm-viewport{scrollbar-color:#414841 transparent}.terminal-scroll{overflow:hidden}.terminal-status{font-size:9px}@media(max-width:760px){.terminal-scroll{height:360px;padding-left:10px}.terminal-shortcuts>span{width:100%;margin-left:5px;margin-bottom:5px}.file-list{height:145px}}
.course-recap{border:1px solid #46593b;background:#232e20;padding:15px;border-radius:7px;font-size:12px;margin-bottom:20px}.course-module{border:1px solid var(--line);padding:13px 15px;border-radius:7px;margin:10px 0}.course-module summary{cursor:pointer;font-size:14px;min-height:32px}.course-number{color:var(--green);font:12px ui-monospace,monospace;margin-right:12px}.course-env{color:var(--green);font-size:11px;margin:9px 0}.course-body{font-size:12px;color:#d2dbd0;line-height:1.9}.course-note{font-size:11px;color:#b6c9a9;background:#222a20;padding:12px;border-left:2px solid #83a657;margin:14px 0}