*{box-sizing:border-box}
body{margin:0;font:15px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;background:#0d1117;color:#e6edf3}
a{color:inherit;text-decoration:none}
.wrap{max-width:1180px;margin:0 auto;padding:28px 20px 80px}

/* top bar */
.topbar{display:flex;align-items:center;gap:24px;padding:0 20px;height:56px;background:#161b22;border-bottom:1px solid #21262d;position:sticky;top:0;z-index:50}
.brand{font-weight:700;letter-spacing:.2px;display:flex;align-items:center;gap:8px}
.brand-icon{color:var(--brand);font-size:18px}
.labnav{display:flex;gap:6px;flex:1}
.labnav-item{padding:6px 12px;border-radius:7px;font-size:13px;color:#9198a1}
.labnav-item:hover{background:#21262d;color:#e6edf3}
.userbox{display:flex;align-items:center;gap:12px;font-size:13px}
.team-chip{background:var(--brand);color:#08121a;font-weight:700;padding:3px 9px;border-radius:20px;font-size:11px;text-transform:uppercase;letter-spacing:.6px}
.logout{color:#6e7681}
.broadcast{padding:12px 20px;font-weight:600;text-align:center;background:var(--brand);color:#08121a}
.broadcast.warn{background:#d29922;color:#1c1400}
.broadcast.good{background:#2ea043;color:#03170a}

/* login */
.login-shell{min-height:100vh;display:grid;place-items:center;background:radial-gradient(900px 500px at 50% -10%,#16324a,#0d1117)}
.login-card{width:380px;background:#161b22;border:1px solid #21262d;border-radius:16px;padding:36px;text-align:center}
.login-logo{font-size:34px;color:#58a6ff;margin-bottom:8px}
.login-card h1{margin:0 0 4px;font-size:22px}
.login-card .sub{color:#8b949e;margin:0 0 22px;font-size:14px}
.login-form{display:grid;gap:14px;text-align:left}
.login-form label{font-size:12px;color:#8b949e;display:grid;gap:6px;text-transform:uppercase;letter-spacing:.6px}
input,select{background:#0d1117;border:1px solid #30363d;color:#e6edf3;border-radius:8px;padding:11px 12px;font-size:15px;width:100%}
input:focus,select:focus{outline:none;border-color:#58a6ff}
button{background:#238636;border:0;color:#fff;padding:11px 16px;border-radius:8px;font-size:15px;font-weight:600;cursor:pointer}
button:hover{filter:brightness(1.1)}
.err{background:#3d1418;border:1px solid #8d2b34;color:#ffb4ac;padding:10px;border-radius:8px;font-size:13px;margin-bottom:14px}
.hint{color:#6e7681;font-size:12px;margin-top:18px}

/* team choose */
.choose h1{font-size:30px;margin:30px 0 6px}
.lede{color:#8b949e;font-size:16px;margin:0 0 26px}
.team-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px}
.team-card{background:#161b22;border:1px solid #21262d;border-top:4px solid var(--c);border-radius:14px;padding:26px;transition:.15s}
.team-card:hover{transform:translateY(-3px);border-color:var(--c)}
.team-icon{font-size:34px;color:var(--c)}
.team-card h2{margin:10px 0 4px;font-size:21px}
.team-tag{color:var(--c);font-weight:600;font-size:13px;margin:0 0 12px}
.team-desc{color:#8b949e;font-size:14px;min-height:66px}
.team-regs{list-style:none;padding:0;margin:0 0 18px;display:flex;flex-wrap:wrap;gap:6px}
.team-regs li{background:#21262d;border-radius:5px;padding:3px 8px;font-size:11px;color:#9198a1;font-family:ui-monospace,monospace}
.team-card button{width:100%;background:var(--c);color:#08121a}

/* dashboard */
.hero{display:grid;grid-template-columns:auto 1fr auto;gap:22px;align-items:center;background:linear-gradient(135deg,#161b22,#12222b);border:1px solid #21262d;border-radius:16px;padding:28px;margin-bottom:26px}
.hero-icon{font-size:48px;color:var(--brand)}
.hero h1{margin:0 0 4px;font-size:26px}
.hero-goal{color:#adbac7;font-size:14px;margin:12px 0 0;max-width:620px}
.hero-progress{text-align:center}
.ring{width:86px;height:86px;border-radius:50%;display:grid;place-items:center;font-weight:700;
  background:conic-gradient(var(--brand) calc(var(--pct)*1%),#21262d 0)}
.ring span{width:64px;height:64px;background:#161b22;border-radius:50%;display:grid;place-items:center;font-size:16px}
.hero-progress small{color:#8b949e;font-size:11px}

.lab-grid{display:grid;gap:14px;margin-bottom:26px}
.lab-card{display:grid;grid-template-columns:auto 1fr auto;gap:20px;align-items:center;background:#161b22;border:1px solid #21262d;border-radius:12px;padding:20px 24px;transition:.15s}
.lab-card:hover{border-color:var(--brand);transform:translateX(3px)}
.lab-icon{font-size:30px}
.lab-meta h3{margin:0;font-size:17px}
.lab-meta p{margin:2px 0 10px;color:#8b949e;font-size:13px}
.bar{height:5px;background:#21262d;border-radius:3px;overflow:hidden;max-width:380px}
.bar span{display:block;height:100%;background:var(--brand)}
.lab-meta small{color:#6e7681;font-size:11px}
.lab-go{color:var(--brand);font-weight:600;font-size:14px}

.panel{background:#161b22;border:1px solid #21262d;border-radius:12px;padding:24px}
.panel h2{margin:0 0 14px;font-size:17px}
.qlist{margin:0;padding-left:18px;color:#adbac7}
.qlist li{margin-bottom:7px}
.fine{color:#6e7681;font-size:12px;margin-top:16px}

/* lab shell */
.lab-shell{display:grid;grid-template-columns:250px 1fr;gap:32px;align-items:start}
.side{background:#161b22;border:1px solid #21262d;border-radius:12px;padding:14px;position:sticky;top:80px}
.side-head{font-weight:700;font-size:14px;padding:6px 8px 12px;border-bottom:1px solid #21262d;margin-bottom:8px}
.side-step{display:grid;grid-template-columns:auto 1fr auto;gap:9px;align-items:center;padding:9px 8px;border-radius:7px;font-size:13px;color:#8b949e}
.side-step:hover{background:#21262d}
.side-step .dot{width:8px;height:8px;border-radius:50%;background:#30363d}
.side-step.done .dot{background:#2ea043}
.side-step.cur{background:#21262d;color:#e6edf3;font-weight:600}
.side-step.cur .dot{background:var(--brand);box-shadow:0 0 0 3px color-mix(in srgb,var(--brand) 25%,transparent)}
.side-step small{color:#4d5560;font-size:10px}

.content{min-width:0}
.crumb{color:#6e7681;font-size:12px;text-transform:uppercase;letter-spacing:.7px}
.content h1{margin:6px 0 20px;font-size:28px}
.content h2{font-size:19px;margin-top:30px}
.content p,.content li{color:#adbac7}
.content code{background:#21262d;padding:2px 6px;border-radius:4px;font-size:13px;font-family:ui-monospace,monospace;color:#79c0ff}
.content pre{background:#161b22;border:1px solid #21262d;border-radius:10px;padding:16px;overflow:auto}
.content pre code{background:none;padding:0}
.content blockquote{border-left:3px solid var(--brand);margin:18px 0;padding:2px 16px;color:#8b949e;background:#161b22;border-radius:0 8px 8px 0}
.content table{border-collapse:collapse;width:100%;margin:16px 0;font-size:14px}
.content th,.content td{border:1px solid #21262d;padding:9px 12px;text-align:left}
.content th{background:#161b22}
.todo{color:#d29922}

/* simulator */
.sim{margin:26px 0;border:1px solid #30363d;border-radius:12px;overflow:hidden;background:#0b0f14}
.sim-chrome{display:flex;align-items:center;gap:8px;padding:9px 12px;background:#1c2129;border-bottom:1px solid #30363d}
.sim-dots{display:flex;gap:6px}
.sim-dots i{width:11px;height:11px;border-radius:50%;background:#30363d;display:block}
.sim-url{flex:1;background:#0d1117;border-radius:6px;padding:5px 12px;font-size:12px;color:#8b949e;font-family:ui-monospace,monospace}
.sim-stage{position:relative;min-height:380px;background:#f6f8fa}
.sim-shot{width:100%;display:block}
.sim-fallback{padding:60px 30px;text-align:center;color:#57606a;background:#f6f8fa}
.sim-hot{position:absolute;border:2px solid #0969da;border-radius:6px;background:rgba(9,105,218,.14);cursor:pointer;animation:pulse 1.6s infinite}
@keyframes pulse{0%,100%{box-shadow:0 0 0 0 rgba(9,105,218,.5)}50%{box-shadow:0 0 0 9px rgba(9,105,218,0)}}
.sim-tip{position:absolute;background:#0969da;color:#fff;padding:7px 12px;border-radius:7px;font-size:12.5px;font-weight:600;max-width:280px;pointer-events:none;box-shadow:0 4px 14px rgba(0,0,0,.35)}
.sim-bar{display:flex;align-items:center;gap:14px;padding:11px 14px;background:#1c2129;border-top:1px solid #30363d;font-size:13px}
.sim-bar .steps{flex:1;color:#8b949e}
.sim-bar button{background:#30363d;padding:6px 13px;font-size:13px}
.sim-bar button.go{background:var(--brand);color:#08121a}
.sim-caption{padding:12px 16px;background:#161b22;border-top:1px solid #21262d;color:#adbac7;font-size:14px}
.sim-placeholder{margin:26px 0;padding:40px;text-align:center;border:1px dashed #30363d;border-radius:12px;color:#6e7681}
.sim-done{padding:40px;text-align:center;color:#2ea043;font-weight:600;background:#f6f8fa}

/* chat */
.chatbox{margin:26px 0;background:#161b22;border:1px solid #21262d;border-radius:12px;overflow:hidden}
.chat-log{padding:18px;min-height:180px;max-height:460px;overflow:auto;display:grid;gap:14px}
.msg{padding:12px 15px;border-radius:11px;font-size:14px;max-width:82%}
.msg.you{background:var(--brand);color:#08121a;justify-self:end;font-weight:500}
.msg.bot{background:#21262d;justify-self:start}
.msg.bot strong{color:#fff}
.msg .cites{margin-top:10px;padding-top:9px;border-top:1px solid #30363d;font-size:11.5px;color:#8b949e}
.msg .cites b{color:#adbac7;display:block;margin-bottom:4px;text-transform:uppercase;letter-spacing:.5px;font-size:10px}
.chat-suggest{display:flex;gap:8px;flex-wrap:wrap;padding:0 18px 12px}
.sug{background:#21262d;color:#8b949e;font-size:12px;font-weight:400;padding:6px 11px;border-radius:16px;text-align:left}
.sug:hover{background:#30363d;color:#e6edf3}
.chat-form{display:flex;gap:10px;padding:14px 18px;border-top:1px solid #21262d}
.chat-form input{flex:1}
.chat-form button{background:var(--brand);color:#08121a}
.typing{color:#6e7681;font-style:italic;font-size:13px}

/* deploy */
.deploy{margin:26px 0}
button.big{font-size:16px;padding:15px 28px;background:var(--brand);color:#08121a}
.stepper{display:grid;gap:9px;margin-top:20px}
.dstep{display:grid;grid-template-columns:22px 1fr auto;gap:12px;align-items:center;padding:11px 14px;background:#161b22;border:1px solid #21262d;border-radius:9px;font-size:14px;color:#6e7681}
.dstep.active{border-color:var(--brand);color:#e6edf3}
.dstep.done{color:#adbac7}
.dstep .mark{text-align:center}
.dstep.done .mark{color:#2ea043}
.spin{display:inline-block;animation:spin 1s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.deploylog{background:#0b0f14;border:1px solid #21262d;border-radius:9px;padding:14px;font-size:12px;color:#8b949e;max-height:220px;overflow:auto;margin-top:14px}

/* nav */
.stepnav{display:flex;justify-content:space-between;align-items:center;gap:14px;margin-top:44px;padding-top:24px;border-top:1px solid #21262d}
.btn{padding:11px 18px;border-radius:8px;font-size:14px;font-weight:600;cursor:pointer;border:0;display:inline-block}
.btn.ghost{background:#21262d;color:#adbac7}
.btn.primary{background:var(--brand);color:#08121a}
.btn.stuck{background:transparent;color:#6e7681;font-weight:400;font-size:13px}
.btn.stuck:hover{color:#d29922}
.btn.stuck.on{color:#d29922}

/* finish */
.finish{text-align:center;padding:50px 0}
.finish h1{font-size:32px;max-width:720px;margin:0 auto 10px}
.finish .btn{margin:8px}
.next{text-align:left;max-width:620px;margin:20px auto;color:#adbac7}
.next li{margin-bottom:9px}

/* facilitator */
.fac h1{font-size:26px}
.fac-stats{display:flex;gap:14px;margin:18px 0}
.fstat{background:#161b22;border:1px solid #21262d;border-radius:11px;padding:16px 22px;min-width:120px}
.fstat b{display:block;font-size:26px}
.fstat small{color:#8b949e;font-size:11px;text-transform:uppercase;letter-spacing:.6px}
.bcast{display:flex;gap:10px;margin:18px 0}
.bcast input{flex:1}
.bcast .ghost{background:#21262d}
.fac-table{width:100%;border-collapse:collapse;font-size:13.5px}
.fac-table th{text-align:left;padding:10px;color:#8b949e;font-size:11px;text-transform:uppercase;letter-spacing:.6px;border-bottom:1px solid #21262d}
.fac-table td{padding:11px 10px;border-bottom:1px solid #161b22}
.fac-table tr.warn td{background:#2a2210}
.fac-table tr.bad td{background:#33161a}
.pill{padding:2px 9px;border-radius:12px;font-size:11px;font-weight:700}
.pill.nuclear{background:#00A3A1;color:#04211f}
.pill.gas{background:#E8820C;color:#241200}
.minibar{height:6px;background:#21262d;border-radius:3px;width:130px;display:inline-block;vertical-align:middle;overflow:hidden}
.minibar span{display:block;height:100%;background:#2ea043}

/* board */
.board{padding:30px}
.board h1{text-align:center;font-size:38px;margin:0 0 26px}
.board-cols{display:grid;grid-template-columns:1fr 1fr;gap:30px}
.board-col{background:#161b22;border-radius:16px;padding:24px}
.board-col h2{margin:0 0 16px;font-size:24px}
.board-col.nuc h2{color:#00A3A1}
.board-col.gas h2{color:#E8820C}
.board-col ol{margin:0;padding-left:30px;font-size:20px;line-height:2}
.board-col li span{float:right;color:#8b949e;font-size:16px}

@media(max-width:900px){
  .lab-shell{grid-template-columns:1fr}
  .side{position:static}
  .hero{grid-template-columns:1fr}
  .team-grid{grid-template-columns:1fr}
  .labnav{display:none}
}

/* quiz */
.quiz{margin:26px 0;display:grid;gap:16px}
.qcard{background:#161b22;border:1px solid #21262d;border-radius:12px;padding:20px 22px}
.qnum{color:#6e7681;font-size:11px;text-transform:uppercase;letter-spacing:.7px;margin-bottom:8px}
.qtext{margin:0 0 16px;font-size:15.5px;color:#e6edf3;font-weight:500}
.qopts{display:grid;gap:8px}
.qopt{background:#0d1117;border:1px solid #30363d;color:#adbac7;text-align:left;padding:12px 15px;font-size:14px;font-weight:400;border-radius:8px;cursor:pointer}
.qopt:hover:not(:disabled){border-color:var(--brand);color:#e6edf3;filter:none}
.qopt:disabled{cursor:default;opacity:.75}
.qopt.right{border-color:#2ea043;background:#0f2417;color:#7ee2a8;opacity:1}
.qopt.wrong{border-color:#8d2b34;background:#2a1417;color:#ffb4ac;opacity:1}
.qwhy{margin-top:14px;padding:12px 14px;border-radius:8px;font-size:13.5px;line-height:1.6}
.qwhy.ok{background:#0f2417;color:#9fdfb8;border-left:3px solid #2ea043}
.qwhy.no{background:#241618;color:#e5b3ae;border-left:3px solid #d29922}
.qscore{text-align:center;padding:18px;background:#161b22;border:1px solid #21262d;border-radius:12px;font-size:16px}
.qscore b{color:var(--brand)}