:root{font-family:Inter,ui-sans-serif,system-ui,sans-serif;color:#183743;background:#f3f5f2}*{box-sizing:border-box}body{margin:0}header{height:76px;background:#fff;border-bottom:1px solid #dae2df;display:flex;justify-content:space-between;align-items:center;padding:0 4vw}.brand{font-size:27px;font-weight:800;letter-spacing:-1px;text-decoration:none;color:#123d4c}.brand span{font-size:17px;font-weight:400;color:#68808a;letter-spacing:0}.pill{font-size:13px;border:1px solid #c8dcd7;border-radius:20px;padding:8px 14px;background:#edf6f2}main{max-width:1600px;margin:auto;padding:30px 4vw}.intro{display:flex;align-items:center;justify-content:space-between;margin-bottom:24px}.eyebrow{font-size:11px;font-weight:800;letter-spacing:2px;color:#437b75}h1{font-size:30px;letter-spacing:-.8px;margin:8px 0}p{line-height:1.6;margin:8px 0;font-size:14px}button{cursor:pointer;font:inherit;font-size:13px;border:1px solid #c9d7d8;border-radius:6px;background:#fff;color:#254551;padding:9px 13px}button:hover{background:#e6f1ed}button:focus-visible,input:focus-visible{outline:3px solid #d1a534;outline-offset:2px}.workspace{display:grid;grid-template-columns:290px minmax(0,1fr);gap:22px}.card{background:#fff;border:1px solid #dae3df;border-radius:10px;padding:20px;margin-bottom:16px}h2{font-size:15px;margin:0 0 12px}svg{width:100%;height:auto}.muted{font-size:12px;color:#58707a}ol{padding-left:19px;font-size:13px;line-height:1.7}li{margin:9px 0}.console-card{border-radius:10px;overflow:hidden;background:#101e28;min-width:0;align-self:start;box-shadow:0 10px 25px #17364013}.console-head{background:#19303b;display:flex;justify-content:space-between;padding:12px;gap:12px}nav{display:flex;gap:6px}nav button{border:0;background:transparent;color:#acbec5;padding:10px 16px}nav button[aria-selected=true]{color:#fff;background:#31505b}nav i{display:inline-block;height:6px;width:6px;border-radius:50%;background:#718088;margin-left:7px}nav .online i{background:#73d7a2}.actions{display:flex;gap:6px}.actions button{background:#24444e;color:#e3f1ef;border-color:#45626c}#status{color:#a7bbc5;font-size:12px;min-height:36px;padding:10px 20px;background:#152731}#terminals{padding:15px 16px;height:540px}.terminal-pane{height:100%;display:none}.terminal-pane.active{display:block}.xterm{height:100%}footer{display:flex;justify-content:space-between;align-items:center;color:#96aeb7;font-size:12px;padding:12px 18px;background:#152731}footer button{padding:5px 8px;background:transparent;color:#bcd2d9;border-color:#35515c}#signin{display:flex;align-items:center;gap:12px;flex-wrap:wrap;border:1px solid #b6d3ce;padding:16px;border-radius:8px;background:#e6f1ed;margin-bottom:20px}#signin small{width:100%;color:#516d76}input{padding:10px;border:1px solid #adcbc8;border-radius:5px;min-width:280px}body.expanded aside,body.expanded .intro,body.expanded header{display:none}body.expanded main{padding:12px;max-width:none}body.expanded .workspace{grid-template-columns:1fr}body.expanded #terminals{height:calc(100dvh - 165px)}@media(max-width:800px){main{padding:20px 12px}.workspace{grid-template-columns:1fr}aside{display:grid;grid-template-columns:1fr 1fr;gap:10px}.card{padding:14px}.intro h1{font-size:23px}.pill{display:none}#terminals{height:480px}.console-head{flex-wrap:wrap}input{min-width:0;width:100%}.intro button{white-space:nowrap}}@media(max-width:480px){aside{grid-template-columns:1fr}aside .card:nth-child(2){display:none}.card svg{height:190px}.intro{align-items:flex-start;gap:8px}nav button{padding:9px 13px}}

.local-echo{position:absolute;z-index:4;pointer-events:none;white-space:pre;color:#71d4b3;background:#101e28;font:15px Consolas,"Liberation Mono",monospace;letter-spacing:0}.echo-control{white-space:nowrap;margin-right:10px}.echo-control input{min-width:0;width:auto;padding:0;vertical-align:middle}footer>div{display:flex;align-items:center;gap:5px;flex-wrap:wrap}
.actions{flex-wrap:wrap}.actions select{font:inherit;font-size:13px;max-width:100%;border:1px solid #45626c;border-radius:6px;background:#24444e;color:#e3f1ef;padding:8px}select:focus-visible{outline:3px solid #d1a534;outline-offset:2px}
/* Course workbench */
header>a:last-child{font-size:14px;color:#27655f}.workspace{grid-template-columns:minmax(330px, .85fr) minmax(0,1.45fr);gap:20px}.lab-picker{display:flex;align-items:end;gap:12px;flex-wrap:wrap;background:#fff;border:1px solid #dae3df;padding:18px;border-radius:12px}.lab-picker>div{flex:1;min-width:250px}.lab-picker label{display:block;font-size:12px;font-weight:700;margin-bottom:7px}.lab-picker select{font:inherit;width:100%;padding:10px;border:1px solid #bad0c9;border-radius:6px;color:#183743;background:#f9fbfa}.lab-picker button{padding:12px 16px}#load-lab{background:#1a6859;color:white;border-color:#1a6859}button:disabled{opacity:.5;cursor:not-allowed}#current-lab{flex-basis:100%;font-size:12px;color:#58707a}.workspace-note{font-size:12px;margin:12px 2px 20px}.guide-card{display:block;background:#fff;border:1px solid #dae3df;border-radius:10px;overflow:hidden;align-self:start;min-width:0}.doc-tabs{padding:8px;background:#edf3f0;gap:2px}.doc-tabs button{padding:10px;color:#4b6969;flex:1}.doc-tabs button[aria-selected=true]{background:white;color:#145e51;box-shadow:0 2px 4px #123b3210}.guide-body{padding:20px;max-height:640px;overflow:auto}.guide-body h2{font-size:21px;line-height:1.3}.guide-body h3{font-size:15px}.guide-body p{font-size:14px}.guide-body ol{font-size:14px;line-height:1.65}.guide-body details{border:1px solid #dce5df;border-radius:8px;margin:12px 0;padding:13px}.guide-body summary{cursor:pointer;font-weight:650;font-size:14px}.guide-body pre{white-space:pre-wrap;overflow-wrap:anywhere;background:#172e38;color:#e1efe9;padding:14px;border-radius:6px;font:12px/1.7 Consolas,monospace}.guide-body .use-device{font-size:11px;padding:5px 9px;margin-top:8px}.guide-footer{padding:14px 20px;border-top:1px solid #dce5df}.guide-footer a{font-size:13px;color:#176b5b;font-weight:700}.guide-footer p{font-size:11px;color:#58707a}.console-head{flex-direction:column}#device-tabs{flex-wrap:wrap}#device-tabs button{padding:9px 12px}.actions{justify-content:flex-end}#terminals{height:530px}.results{margin-top:24px;background:white;padding:20px;border:1px solid #dce5df;border-radius:10px}.results details{border-bottom:1px solid #dce5df;padding:12px}.results pre{white-space:pre-wrap;overflow-wrap:anywhere;font-size:12px}.pass{color:#146e50}.fail{color:#a32c36}#operation{padding:16px;background:#e4f1ea;border-left:4px solid #327e64;margin:16px 0;border-radius:4px}#operation.error{background:#fff0ed;border-color:#ad4736}.topology-image{width:100%;display:block;border:1px solid #e1e8e4;border-radius:6px}.address-table{border-collapse:collapse;width:100%;font-size:12px;margin:16px 0}.address-table th,.address-table td{padding:8px;border-bottom:1px solid #e1e8e4;text-align:left}.source-note{font-size:12px!important;color:#58707a}body.expanded .lab-picker,body.expanded .workspace-note,body.expanded #operation,body.expanded .results{display:none}body.expanded #terminals{height:calc(100dvh - 215px)}@media(max-width:1050px){.workspace{grid-template-columns:minmax(290px,.8fr) minmax(0,1fr)}.console-head nav{gap:1px}#device-tabs button{padding:8px}.guide-body{padding:15px}footer{flex-wrap:wrap;gap:10px}}@media(max-width:800px){.workspace{grid-template-columns:1fr}.guide-card{display:block}.guide-body{max-height:460px}.lab-picker{padding:14px}.intro{gap:10px}.lab-picker button{flex:1}#terminals{height:480px}}@media(max-width:480px){.guide-body .topology-image{height:auto}.doc-tabs button{font-size:12px;padding:9px 5px}.intro h1{font-size:23px}header{height:64px}header>a:last-child{font-size:11px}.guide-body{max-height:440px}}
/* Shared appearance and explicit selected/loaded lab context. */
:root{--bg:#f7f6f2;--paper:#fff;--soft:#f1efe9;--ink:#1c1b19;--muted:#5e5b55;--line:#e4e0d8;--border:#8c877d;--accent:#0b6e78;--tint:#e3f1f2;--ok:#1a7a3a;--bad:#b3261e;--button-ink:#fff;--warning:#775312;--warning-bg:#fff7e2;color-scheme:light;background:var(--bg);color:var(--ink)}
:root[data-theme=dark]{--bg:#121311;--paper:#1b1c19;--soft:#23241f;--ink:#eceae4;--muted:#a6a39b;--line:#383a33;--border:#868278;--accent:#5fc4c9;--tint:#163538;--ok:#6ccb7f;--bad:#f28b82;--button-ink:#07262a;--warning:#f0cc80;--warning-bg:#342b19;color-scheme:dark}
a{color:var(--accent)}button{background:var(--paper);color:var(--accent);border-color:var(--border)}button:hover{background:var(--tint)}
.eyebrow,.guide-footer a{color:var(--accent)}.muted,.source-note,.guide-footer p,#current-lab{color:var(--muted)}
.lab-picker,.guide-card,.results,.card{background:var(--paper);border-color:var(--line)}.lab-picker select{background:var(--paper);color:var(--ink);border-color:var(--border)}
#load-lab,#load-preview{background:var(--accent);border-color:var(--accent);color:var(--button-ink)}
.doc-tabs{background:var(--soft)}.doc-tabs button{color:var(--muted)}.doc-tabs button[aria-selected=true]{background:var(--tint);color:var(--accent)}
.guide-body details,.guide-footer,.address-table th,.address-table td,.results details{border-color:var(--line)}
#signin,#operation{background:var(--tint);border-color:var(--accent)}#operation.error{background:var(--warning-bg);border-color:var(--bad)}
.pass{color:var(--ok)}.fail{color:var(--bad)}.topology-image{background:#f7fafc;border-color:var(--line)}
.lab-context{display:flex;align-items:center;justify-content:space-between;gap:16px;margin:16px 0 0;padding:16px 18px;border:1px solid var(--line);border-left:5px solid var(--accent);border-radius:8px;background:var(--paper)}
.lab-context .context-label{font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.07em;color:var(--muted);margin:0 0 4px}.lab-context strong{font-size:17px}.lab-context p{margin:5px 0 0}.lab-context.mismatch{border-left-color:var(--warning);background:var(--warning-bg)}.lab-context.mismatch #context-message{color:var(--warning)}
.context-actions{display:flex;gap:8px;flex-shrink:0;flex-wrap:wrap}.console-network{padding:12px 18px;color:#cee9e3;background:#193e40;font-size:13px;line-height:1.5}.console-network.mismatch{background:#49391e;color:#ffe0a0}
body.expanded .lab-context{display:none}
@media(max-width:1050px){.lab-context{align-items:flex-start;flex-direction:column}.context-actions{flex-shrink:1}}

[role=tab]:focus-visible,[role=tabpanel]:focus-visible{outline:3px solid var(--accent);outline-offset:-3px}

.slot-list,.reservation-actions{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin:12px 0}.slot{padding:10px 14px;border:1px solid var(--line);border-radius:8px;background:var(--soft)}.slot.mine{border-color:var(--accent);background:var(--tint)}.reservation-actions select{font:inherit;padding:8px;background:var(--paper);color:var(--ink);border:1px solid var(--border);border-radius:6px}.guide-body table{max-width:100%;font-size:12px;border-collapse:collapse}.guide-body td,.guide-body th{padding:5px;border:1px solid var(--line);overflow-wrap:anywhere}.guide-body{overflow-wrap:anywhere}.guide-body a{color:var(--accent)}[hidden]{display:none!important}

.console-card .actions button:disabled{background:#24444e;color:#b7cbd0;opacity:1;border-color:#45626c}.console-card .actions button:hover{background:#31545e}.console-card .actions select:disabled{opacity:1;color:#b7cbd0}body.expanded #reservations{display:none}

.preparation{padding:18px 20px;margin:16px 0;border:1px solid var(--line);border-left:4px solid var(--accent);border-radius:8px;background:var(--tint);color:var(--ink)}#preparation-time{font-size:24px;font-weight:700;font-variant-numeric:tabular-nums;white-space:nowrap}body.expanded #preparation{display:none}

.terminal-key-hint{padding:8px 18px;color:#bcd2d9;background:#152731;font-size:12px;line-height:1.4}
.console-card:fullscreen{display:flex;flex-direction:column;width:100%;height:100%;border-radius:0;overflow:auto}
.console-card:fullscreen #terminals{flex:1;min-height:100px;height:0}
.console-card:fullscreen .console-head,.console-card:fullscreen footer,.console-card:fullscreen .terminal-key-hint{flex-shrink:0}

/* Persistent lab practice tracker. Uses existing theme variables. */
.attempt-form{margin-top:1.5rem;padding-top:1rem;border-top:1px solid var(--line,#9aa9b5)}
.assistance-label{display:flex;align-items:center;gap:.65rem;font-weight:600}
.assistance-label input{width:1.25rem;min-width:0;height:1.25rem;flex-shrink:0;margin:0}
.lab-progress{margin-top:1.5rem;scroll-margin-top:1rem}
.progress-overview{display:flex;flex-wrap:wrap;gap:1rem;margin:1rem 0}
.progress-overview p{padding:.6rem .8rem;border:1px solid var(--line,#9aa9b5);border-radius:8px;margin:0}
#lab-progress-list ul{list-style:none;padding:0}#lab-progress-list li{padding:.65rem 0;border-bottom:1px solid var(--line,#9aa9b5)}
#lab-progress-list strong,#lab-progress-list span{display:block}
.attempt-row{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:.8rem 0;border-top:1px solid var(--line,#9aa9b5)}
.attempt-row p{margin:.35rem 0}.attempt-row button{flex-shrink:0}
@media(max-width:600px){.attempt-row{align-items:flex-start;flex-direction:column}.progress-overview{flex-direction:column}}