body.ifd-lab-active{overflow:hidden;background:#e7edf3}
body.ifd-lab-active .md-header,body.ifd-lab-active .md-tabs,body.ifd-lab-active .md-sidebar,body.ifd-lab-active .md-footer,body.ifd-lab-active .ifd-modebar{display:none!important}
body.ifd-lab-active .md-main{height:100vh;padding:0}
body.ifd-lab-active .md-main__inner{max-width:none;height:100vh;margin:0;padding:0}
body.ifd-lab-active .md-content{max-width:none;margin:0}
body.ifd-lab-active .md-content__inner{height:100vh;margin:0;padding:0}
body.ifd-lab-active .md-content__inner:before,body.ifd-lab-active .md-content__inner>h1,body.ifd-lab-active .md-content__inner>.headerlink,body.ifd-lab-active .md-content__inner>p{display:none}

.ifd-router-lab{--ifd-blue:#185fa5;--ifd-navy:#0b1220;--router-width:68%;height:100vh;margin:0;color:#1b232e;background:#e7edf3;font-family:Inter,Arial,sans-serif}
.ifd-router-lab *{box-sizing:border-box}
.ifd-router-lab button,.ifd-router-lab input,.ifd-router-lab textarea,.ifd-router-lab select{font:inherit}
.ifd-router-lab button{min-height:2.5rem;padding:.48rem .78rem;color:#fff;border:1px solid #185fa5;border-radius:.32rem;background:#185fa5;cursor:pointer}
.ifd-router-lab button:hover{filter:brightness(.94)}
.ifd-router-lab button:disabled{opacity:.48;cursor:not-allowed}
.ifd-router-lab button:focus-visible,.ifd-router-lab input:focus-visible,.ifd-router-lab textarea:focus-visible,.ifd-router-lab select:focus-visible,.ifd-router-lab a:focus-visible,.ifd-lab-divider:focus-visible{outline:3px solid #f2a900;outline-offset:2px}
.ifd-lab-loading,.ifd-lab-alert{margin:1rem;padding:1rem;border:1px solid #b8c6d8;border-radius:.45rem;background:#fff}

.ifd-lab-topbar{height:4.15rem;display:flex;align-items:center;gap:1rem;padding:.55rem 1rem;color:#fff;background:#0b1220;box-shadow:0 2px 10px rgba(0,0,0,.2)}
.ifd-lab-identity{display:flex;align-items:center;gap:1rem;min-width:0}.ifd-lab-identity>div{display:grid;min-width:0}.ifd-lab-identity span{color:#9fb1c8;font-size:.66rem;font-weight:750;letter-spacing:.08em;text-transform:uppercase}.ifd-lab-identity strong{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:.98rem}.ifd-lab-exit{padding:.45rem .6rem;color:#dce7f3!important;border:1px solid #415269;border-radius:.3rem;text-decoration:none;font-size:.78rem;white-space:nowrap}
.ifd-lab-progress{display:flex;align-items:center;gap:.45rem;margin-left:auto}.ifd-lab-progress span{color:#9fb1c8;font-size:.72rem}.ifd-lab-progress strong{display:grid;place-items:center;width:2.4rem;height:2rem;border-radius:1rem;background:#1f3858}
.ifd-lab-tools{display:flex;gap:.45rem}.ifd-lab-quiet{color:#185fa5!important;background:#fff!important}.ifd-lab-topbar .ifd-lab-quiet{color:#dce7f3!important;border-color:#62738a!important;background:transparent!important}.ifd-lab-danger{color:#fff!important;border-color:#a43f43!important;background:#8d2c31!important}
.ifd-mobile-switch{display:none}
.ifd-lab-workspace{height:calc(100vh - 4.15rem);display:grid;grid-template-columns:minmax(0,var(--router-width)) .6rem minmax(18rem,1fr);overflow:hidden}
.ifd-router-pane,.ifd-task-pane{min-width:0;overflow:auto;overscroll-behavior:contain;scrollbar-gutter:stable}
.ifd-router-pane{padding:1rem;background:#dfe6ed}
.ifd-task-pane{background:#fff;border-left:1px solid #c9d2dc}
.ifd-lab-divider{position:relative;z-index:4;background:#c3ced9;cursor:col-resize}.ifd-lab-divider:after{content:"";position:absolute;top:50%;left:50%;width:.2rem;height:3.5rem;border-radius:1rem;background:#66788b;transform:translate(-50%,-50%)}

.gateway{max-width:78rem;min-height:100%;margin:0 auto;overflow:hidden;border:1px solid #aebac6;border-radius:.45rem;background:#fff;box-shadow:0 .25rem 1rem rgba(20,36,53,.16);font-family:Arial,sans-serif}
.gateway-header{min-height:4.6rem;display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:.8rem 1.15rem;color:#fff;background:#174c68}
.gateway-brand,.gateway-header-status{display:flex;align-items:center;gap:.75rem}.gateway-brand>div,.gateway-header-status>div{display:grid}.gateway-brand span,.gateway-header-status span{color:#d5e9f1;font-size:.72rem}.gateway-mark{display:grid!important;place-items:center;width:2.5rem;height:2.5rem;color:#174c68!important;border-radius:.35rem;background:#e9f6f9;font-weight:900}.status-dot{width:.7rem;height:.7rem;border-radius:50%;background:#71db9c;box-shadow:0 0 0 3px rgba(113,219,156,.2)}
.gateway-nav{display:flex;gap:0;overflow-x:auto;border-bottom:1px solid #b9c4ce;background:#f0f3f5}.gateway-nav button{min-width:max-content;color:#273948;border:0;border-right:1px solid #c9d2d9;border-radius:0;background:transparent}.gateway-nav button[aria-current=page]{color:#123f58;background:#fff;box-shadow:inset 0 -3px #1c789b}
.gateway-location{display:flex;align-items:center;gap:.8rem;padding:.55rem .85rem;border-bottom:1px solid #d4dce2;background:#fff}.gateway-location>button{min-height:2rem;padding:.25rem .5rem;color:#174c68;border-color:#b6c3cc;background:#fff}.gateway-breadcrumbs{display:flex;flex-wrap:wrap;gap:.35rem;color:#586976;font-size:.78rem}.gateway-breadcrumbs strong{color:#263b4a}
.gateway-screen{padding:clamp(1rem,2.5vw,2rem);background:#fff}.gateway-screen h2,.gateway-screen h3{color:#183b50}.gateway-page-head{display:flex;align-items:flex-start;justify-content:space-between;gap:1rem;margin-bottom:1.2rem}.gateway-page-head span:first-child{color:#547181;font-size:.72rem;font-weight:800;letter-spacing:.06em;text-transform:uppercase}.gateway-page-head h2{margin:.1rem 0 .25rem}.gateway-page-head p{max-width:42rem;margin:0;color:#586873}
.gateway-pill{display:inline-block;padding:.24rem .55rem;color:#4b5962;border:1px solid #bdc7ce;border-radius:1rem;background:#f3f5f6;font-size:.72rem;white-space:nowrap}.gateway-pill.is-good{color:#195a37;border-color:#75ae8e;background:#eef8f2}
.gateway-metrics{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:.7rem;margin-bottom:1rem}.gateway-metrics.is-three{grid-template-columns:repeat(3,minmax(0,1fr))}.gateway-metrics>button,.gateway-metrics>div{display:grid;gap:.25rem;min-height:6.2rem;padding:.85rem;color:#253c4a;text-align:left;border:1px solid #c8d1d8;border-radius:.3rem;background:#f7f9fa}.gateway-metrics>button:hover{border-color:#1c789b;filter:none}.gateway-metrics span{color:#667985;font-size:.72rem}.gateway-metrics strong{color:#183b50;font-size:1rem}.gateway-metrics small{color:#596b77}
.gateway-card{margin:0 0 1rem;padding:1rem;border:1px solid #ced7de;border-radius:.35rem;background:#fafbfc}.gateway-card h3{margin:0 0 .8rem;font-size:1rem}.gateway-facts{margin:0}.gateway-facts>div{display:grid;grid-template-columns:minmax(9rem,.7fr) minmax(0,1fr);gap:1rem;padding:.55rem 0;border-bottom:1px solid #e1e6ea}.gateway-facts>div:last-child{border-bottom:0}.gateway-facts dt{color:#5a6c77}.gateway-facts dd{margin:0;color:#1f303b;font-weight:700;overflow-wrap:anywhere}.gateway-setting-link{display:flex;align-items:center;justify-content:space-between;gap:1rem}.gateway-setting-link p{margin:0}
.gateway-table-wrap{overflow-x:auto}.gateway table{width:100%;border-collapse:collapse;font-size:.84rem}.gateway th{padding:.65rem;color:#eaf3f7;text-align:left;background:#214f67}.gateway td{padding:.7rem;border-bottom:1px solid #dce3e8;vertical-align:middle}.gateway td small{display:block;color:#62737f}.gateway code{color:#173e54;background:#edf2f5}.gateway-link{min-height:2rem!important;padding:.25rem .5rem!important;color:#185fa5!important;border-color:#a8bac6!important;background:#fff!important;font-size:.78rem}
.gateway-actions{display:flex;flex-wrap:wrap;gap:.55rem;margin-top:1rem}.gateway-secondary{color:#185fa5!important;background:#fff!important}.gateway-danger{color:#8d2c31!important;border-color:#a43f43!important;background:#fff!important}.gateway-notice,.gateway-alert{margin:0 0 1rem;padding:.7rem .85rem;border-left:4px solid #1c789b;background:#ecf6f9}.gateway-alert{border-left-color:#a43f43;background:#fbefef}
.gateway-rule-flow>div{display:grid;grid-template-columns:minmax(8rem,1fr) auto minmax(8rem,1fr) auto minmax(10rem,1.3fr);align-items:center;gap:.55rem}.gateway-rule-flow span{display:grid;gap:.25rem;padding:.65rem;border:1px solid #b9c9d4;border-radius:.3rem;background:#fff;text-align:center}.gateway-rule-flow b{color:#1c789b;font-size:1.35rem}.gateway-rule-flow code{overflow-wrap:anywhere}.gateway-rule-flow p{margin:.7rem 0 0;color:#586873;font-size:.8rem}
.gateway-form,.gateway-login form{display:grid;gap:.85rem;max-width:34rem}.gateway-form label,.gateway-login label{display:grid;gap:.3rem;color:#304754;font-size:.82rem;font-weight:700}.gateway-form input,.gateway-form select,.gateway-login input{width:100%;padding:.55rem;border:1px solid #889ba7;border-radius:.25rem;background:#fff}.gateway-form-error{min-height:1.2rem;color:#8d2c31;font-weight:700}.gateway-login{max-width:34rem;margin:2rem auto;padding:1.4rem;border:1px solid #c5d0d8;border-radius:.35rem;background:#f8fafb}.gateway-login>span{color:#547181;font-size:.72rem;font-weight:800;text-transform:uppercase}.gateway-login h2{margin:.25rem 0}

.ifd-task-tabs{position:sticky;top:0;z-index:3;display:grid;grid-template-columns:repeat(3,1fr);border-bottom:1px solid #cad4dd;background:#f2f5f8}.ifd-task-tabs button{color:#384c5c;border:0;border-radius:0;background:transparent}.ifd-task-tabs button[aria-selected=true]{color:#185fa5;background:#fff;box-shadow:inset 0 -3px #185fa5}
.ifd-task-content{padding:1rem}.task-mode{display:flex;align-items:center;justify-content:space-between;gap:.7rem;margin-bottom:1rem;color:#5c6d7b;font-size:.78rem}.task-mode label{display:flex;align-items:center;gap:.45rem}.task-mode select{padding:.3rem;border:1px solid #9cabb7;border-radius:.25rem;background:#fff}
.task-card>h2{margin:.2rem 0 .55rem;color:#102f47;font-size:1.25rem}.task-card>p{color:#526472}.task-time,.task-panel-head>span{color:#185fa5;font-size:.7rem;font-weight:850;letter-spacing:.06em;text-transform:uppercase}.task-question{margin:1rem 0;padding:1rem;border:1px solid #d0d9e1;border-radius:.4rem;background:#f7f9fb}.task-question>p{margin:.25rem 0 .8rem}.task-question label,.task-fields label,.notebook-entry label{display:grid;gap:.3rem;margin-top:.65rem;color:#334a59;font-size:.78rem;font-weight:750}.task-question input,.task-question textarea,.task-question select,.notebook-entry textarea{width:100%;padding:.55rem;color:#1b232e;border:1px solid #93a4b2;border-radius:.25rem;background:#fff}.task-fields{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.6rem}.task-guidance{margin:.8rem 0}.task-hint{margin-top:.6rem;padding:.8rem;border-left:4px solid #26a3b6;background:#ecf9fb}.task-hint p{margin-top:0}.task-hint small{display:block;margin-top:.5rem;color:#596b78}.task-stage{width:100%;margin:.4rem 0 .7rem;background:#28576f!important}.task-record{width:100%}.task-result{margin-top:.8rem;padding:.75rem;border-left:4px solid #c98b27;background:#fff7e8}.task-result.is-correct{border-left-color:#3b8d5a;background:#eef8f1}.task-result p{margin:.35rem 0 0}.task-pager{display:flex;justify-content:space-between;gap:.7rem;margin-top:1rem}
.task-exhibit{margin:.9rem 0;padding:.85rem;border:1px solid #9fb7c8;border-radius:.35rem;background:#edf5f8}.task-exhibit>span{color:#185fa5;font-size:.7rem;font-weight:850;letter-spacing:.06em;text-transform:uppercase}.task-exhibit h3{margin:.25rem 0}.task-exhibit a,.task-next-lab{display:inline-block;margin-top:.35rem;font-weight:800}.task-router-check{margin:.6rem 0;padding:.55rem .7rem;border-left:4px solid #26a3b6;background:#ecf9fb}.task-router-check p{margin:0}.task-choices{margin:.6rem 0;border:0;padding:0}.task-choices legend{margin-bottom:.35rem;font-weight:750}.task-choices label{display:flex;align-items:flex-start;gap:.5rem;margin:.35rem 0}.task-choices input{width:auto;margin-top:.2rem}
.task-panel-head h2{margin:.2rem 0}.task-panel-head p{color:#5c6d78}.evidence-list{display:grid;gap:.6rem}.evidence-item{border:1px solid #ccd7df;border-radius:.35rem;background:#fafcfd}.evidence-item summary{display:grid;gap:.15rem;padding:.8rem;cursor:pointer;font-weight:750}.evidence-item summary small{color:#637480;font-weight:400}.evidence-item>dl,.evidence-item>p,.evidence-item>a{margin:.75rem}.evidence-item dl{display:grid;grid-template-columns:4rem 1fr;gap:.3rem;font-size:.78rem}.evidence-item dt{font-weight:800}.evidence-item dd{margin:0}.notebook-actions{display:flex;flex-wrap:wrap;gap:.45rem;margin-bottom:1rem}.notebook-list{display:grid;gap:.75rem}.notebook-entry{padding:.8rem;border:1px solid #ccd6df;border-radius:.35rem;background:#fafcfd}.notebook-entry header{display:flex;align-items:center;justify-content:space-between}.notebook-entry header button{min-height:1.8rem;padding:.2rem .45rem;font-size:.72rem}.notebook-empty{padding:1.5rem;text-align:center;color:#60717e;border:1px dashed #9baab6}

@media(max-width:1050px){.ifd-lab-tools .ifd-lab-quiet{display:none}.gateway-metrics{grid-template-columns:repeat(2,minmax(0,1fr))}.gateway-header-status span:last-child{display:none}.task-fields{grid-template-columns:1fr}}
@media(max-width:760px){body.ifd-lab-active{overflow:auto}.ifd-router-lab{height:auto;min-height:100vh}.ifd-lab-topbar{height:auto;min-height:4.2rem;flex-wrap:wrap}.ifd-lab-identity{flex:1}.ifd-lab-progress{margin-left:0}.ifd-lab-tools{margin-left:auto}.ifd-mobile-switch{display:grid;grid-template-columns:1fr 1fr;position:sticky;top:0;z-index:8;padding:.4rem;background:#dce4eb}.ifd-mobile-switch button{color:#314656;border-color:transparent;background:transparent}.ifd-mobile-switch button[aria-pressed=true]{color:#fff;background:#185fa5}.ifd-lab-workspace{display:block;height:calc(100vh - 8.2rem);overflow:hidden}.ifd-router-pane,.ifd-task-pane{display:none;height:100%;border:0}.ifd-router-pane.is-mobile-active,.ifd-task-pane.is-mobile-active{display:block}.ifd-router-pane{padding:.5rem}.ifd-lab-divider{display:none}.gateway{min-height:100%}.gateway-nav{position:sticky;top:0;z-index:3}.gateway-screen{padding:.9rem}.gateway-metrics,.gateway-metrics.is-three{grid-template-columns:1fr 1fr}.gateway-page-head{display:block}.gateway-page-head>button,.gateway-page-head>.gateway-pill{margin-top:.6rem}.gateway-facts>div{grid-template-columns:1fr;gap:.2rem}.gateway-rule-flow>div{grid-template-columns:1fr}.gateway-rule-flow b{transform:rotate(90deg);text-align:center}.ifd-task-tabs{top:0}}
@media(max-width:430px){.ifd-lab-exit{font-size:0}.ifd-lab-exit:after{content:"← Exit";font-size:.78rem}.ifd-lab-progress span{display:none}.ifd-lab-tools .ifd-lab-danger{padding:.4rem;font-size:.72rem}.gateway-header{align-items:flex-start}.gateway-header-status{display:none}.gateway-metrics,.gateway-metrics.is-three{grid-template-columns:1fr}.gateway-setting-link{display:block}.gateway-setting-link button{margin-top:.7rem}}
@media(prefers-reduced-motion:reduce){.ifd-router-lab *{scroll-behavior:auto!important}}

/* Issue 162: compact router workspace and persistent task controls. */
.ifd-lab-topbar{position:relative;z-index:30;height:3.55rem;gap:.75rem;padding:.4rem .75rem}
.ifd-lab-controls{position:relative}.ifd-lab-controls summary{min-height:2.35rem;display:flex;align-items:center;padding:.42rem .7rem;color:#dce7f3;border:1px solid #62738a;border-radius:.32rem;cursor:pointer;list-style:none;font-size:.78rem;font-weight:750}.ifd-lab-controls summary::-webkit-details-marker{display:none}.ifd-lab-controls summary:after{content:"▾";margin-left:.5rem}.ifd-lab-controls[open] summary:after{content:"▴"}.ifd-lab-controls-menu{position:absolute;right:0;top:calc(100% + .35rem);z-index:20;display:grid;gap:.45rem;width:min(22rem,88vw);padding:.55rem;border:1px solid #aebac6;border-radius:.4rem;background:#fff;box-shadow:0 .5rem 1.5rem rgba(15,32,48,.24)}.ifd-lab-controls-menu button{display:grid;gap:.18rem;text-align:left}.ifd-lab-controls-menu button span{font-size:.72rem;font-weight:400}.ifd-lab-topbar .ifd-lab-quiet{color:#185fa5!important;border-color:#9db2c0!important;background:#f8fbfd!important}
.ifd-lab-controls{z-index:31}
.ifd-lab-controls-menu{position:fixed;right:.75rem;top:3.25rem;z-index:50}
.ifd-lab-workspace{height:calc(100vh - 3.55rem);grid-template-columns:minmax(0,var(--router-width)) .5rem minmax(18rem,1fr)}.ifd-router-pane{padding:.55rem}.ifd-task-pane{overflow:hidden}
.gateway-header{min-height:3.55rem;gap:.75rem;padding:.5rem .8rem}.gateway-mark{width:2.1rem;height:2.1rem}
.gateway-nav{display:block;overflow-x:auto}.gateway-nav-primary,.gateway-subnav{display:flex;min-width:max-content}.gateway-subnav{border-top:1px solid #d4dce2;background:#e6edf2}.gateway-nav button{min-height:2.25rem;padding:.36rem .65rem;font-size:.82rem}.gateway-subnav button{font-size:.76rem}
.gateway-location{gap:.65rem;padding:.38rem .65rem}.gateway-location>button{min-height:1.85rem;padding:.18rem .42rem}.gateway-breadcrumbs{align-items:center;gap:.25rem;font-size:.76rem}.gateway-crumb{min-height:auto!important;padding:.1rem!important;color:#185fa5!important;border:0!important;background:transparent!important;font-size:inherit}
.gateway-screen{padding:clamp(.65rem,1.4vw,1rem)}.gateway-page-head{gap:.75rem;margin-bottom:.7rem}.gateway-page-head h2{margin:.06rem 0 .18rem;font-size:1.35rem}.gateway-page-head p{font-size:.86rem}
.gateway-metrics{gap:.55rem;margin-bottom:.7rem}.gateway-metrics.is-two{grid-template-columns:repeat(2,minmax(0,1fr))}.gateway-metrics>button,.gateway-metrics>div{gap:.18rem;min-height:4.65rem;padding:.6rem}.gateway-metrics span{font-size:.7rem}.gateway-metrics strong{font-size:.95rem}
.gateway-card{margin-bottom:.7rem;padding:.72rem}.gateway-card h3{margin-bottom:.5rem;font-size:.96rem}.gateway-facts>div{gap:.75rem;padding:.36rem 0}.gateway td{padding:.5rem}.gateway-name-link{min-height:auto!important;padding:0!important;color:#185fa5!important;border:0!important;background:transparent!important;font-weight:750;text-align:left;text-decoration:underline;text-underline-offset:.16em}
.ifd-task-shell{height:100%;display:flex;min-height:0;flex-direction:column}.ifd-task-tabs{position:static;flex:0 0 auto}.ifd-task-tabs button{min-height:2.35rem;padding:.36rem}.ifd-task-content{min-height:0;flex:1;overflow:auto;padding:.75rem}.ifd-task-content.is-task-view{overflow:hidden;padding:0}.task-view-task{height:100%;display:flex;min-height:0;flex-direction:column}.task-context{z-index:2;flex:0 0 auto;padding:.65rem .75rem;border-bottom:1px solid #d2dbe2;background:#fff}.task-context h2{margin:.12rem 0 .28rem;color:#102f47;font-size:1.15rem}.task-context>p{margin:.2rem 0;color:#526472;font-size:.82rem}.task-access-note{padding:.4rem .5rem;border-left:3px solid #26a3b6;background:#ecf9fb}.task-scroll{min-height:0;flex:1;overflow:auto;padding:.75rem}.task-mode{margin-bottom:.4rem;font-size:.76rem}.task-mode select{padding:.25rem}.task-question{margin:0 0 .75rem;padding:.75rem}.task-fields{grid-template-columns:1fr;gap:.35rem}.task-pager{z-index:2;flex:0 0 auto;margin:0;padding:.55rem .75rem;border-top:1px solid #cad4dd;background:#fff}
@media(max-width:1050px){.ifd-lab-controls{margin-left:auto}.gateway-metrics.is-two{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:760px){.ifd-lab-topbar{min-height:3.8rem}.ifd-lab-workspace{height:calc(100vh - 7.8rem)}.ifd-router-pane{padding:.35rem}.gateway-screen{padding:.65rem}.ifd-task-pane{overflow:hidden}.ifd-task-content{padding:.65rem}.ifd-task-content.is-task-view{padding:0}.gateway-metrics.is-two{grid-template-columns:1fr 1fr}}
@media(max-width:430px){.ifd-lab-controls summary{padding:.35rem .5rem;font-size:.72rem}.gateway-metrics.is-two{grid-template-columns:1fr}}

/* Issue 164: simulated browser access and guided teaching journey. */
.lab-browser{max-width:78rem;min-height:100%;margin:0 auto;overflow:hidden;border:1px solid #aebac6;border-radius:.45rem;background:#fff;box-shadow:0 .25rem 1rem rgba(20,36,53,.16)}
.lab-browser-toolbar{display:flex;align-items:center;gap:.3rem;padding:.38rem;background:#d7dfe6;border-bottom:1px solid #aebac6}.lab-browser-toolbar .browser-icon{flex:0 0 auto;width:2.2rem;min-height:2.05rem;padding:.2rem;color:#263b4a;border-color:#a8b5bf;background:#f7f9fa}.lab-browser-toolbar form{display:flex;min-width:0;flex:1;gap:.3rem}.lab-browser-toolbar input{min-width:0;flex:1;padding:.42rem .6rem;border:1px solid #8798a5;border-radius:.25rem;background:#fff;font-family:ui-monospace,SFMono-Regular,Consolas,monospace}.lab-browser-toolbar form button{min-height:2.05rem;padding:.25rem .65rem}
.lab-browser-viewport{min-height:calc(100vh - 9rem);background:#fff}.lab-browser-viewport>.gateway{max-width:none;min-height:0;border:0;border-radius:0;box-shadow:none}.browser-message,.lab-resume{max-width:38rem;margin:clamp(2rem,8vh,5rem) auto;padding:1.4rem;border:1px solid #c5d0d8;border-radius:.4rem;background:#f8fafb}.browser-message>span,.lab-resume>span{color:#547181;font-size:.72rem;font-weight:800;letter-spacing:.06em;text-transform:uppercase}.browser-message h2,.lab-resume h2{margin:.3rem 0;color:#183b50}.lab-resume small{display:block;margin-top:1rem;color:#596b77}.sr-only{position:absolute!important;width:1px!important;height:1px!important;padding:0!important;margin:-1px!important;overflow:hidden!important;clip:rect(0,0,0,0)!important;white-space:nowrap!important;border:0!important}
.password-row{display:flex;align-items:stretch;gap:.4rem}.password-row input{min-width:0;flex:1}.password-row button{flex:0 0 auto}
.task-access-card{margin:0 0 .75rem;border:1px solid #9fb7c8;border-radius:.35rem;background:#edf5f8}.task-access-card summary{padding:.65rem .75rem;color:#173e54;cursor:pointer;font-weight:800}.task-access-card dl{margin:0;padding:0 .75rem .45rem}.task-access-card dl>div{display:grid;grid-template-columns:1fr 1.35fr;gap:.5rem;padding:.28rem 0}.task-access-card dt{color:#526978}.task-access-card dd{margin:0;font-weight:800;overflow-wrap:anywhere}.task-access-card p{margin:.2rem .75rem .7rem;color:#526978;font-size:.78rem}.task-teaching h3{margin:.8rem 0 .2rem;color:#173e54;font-size:.9rem}.task-teaching>p{margin:.15rem 0 .6rem;color:#435765;line-height:1.45}.task-interpret{margin:.8rem 0;padding:.7rem;border-left:4px solid #267b91;background:#edf7f9}.task-interpret p{margin:.25rem 0 0}.task-explain{margin:.7rem 0;border:1px solid #ced9e0;border-radius:.3rem;background:#fafcfd}.task-explain summary{padding:.6rem;cursor:pointer;font-weight:800}.task-explain p{margin:0;padding:0 .6rem .7rem;color:#435765}.task-more{display:grid;gap:.45rem;margin:.8rem 0;padding:.7rem;border-top:1px solid #c7d4dc;border-bottom:1px solid #c7d4dc}.task-more>strong{color:#173e54}.task-more a{display:grid;gap:.12rem;padding:.5rem;color:#185fa5;border:1px solid #c9d6df;border-radius:.3rem;background:#f8fbfd;text-decoration:none}.task-more a:hover{text-decoration:underline}.task-more a small{font-weight:400}.task-more em{color:#526978;font-size:.75rem;font-style:normal}
@media(max-width:760px){.lab-browser-toolbar{gap:.2rem;padding:.3rem}.lab-browser-toolbar .browser-icon{width:1.9rem;padding:.1rem}.lab-browser-toolbar form button{padding:.2rem .45rem}.lab-browser-viewport{min-height:calc(100vh - 11rem)}.browser-message,.lab-resume{margin:1rem;padding:1rem}.task-access-card dl>div{grid-template-columns:1fr}}

/* Issue 166: viewport-safe teaching experience. */
body.ifd-lab-active{overflow:hidden}
.ifd-router-lab{position:fixed;inset:0;z-index:40;display:flex;height:100vh;height:100dvh;min-height:0;flex-direction:column;overflow:hidden}
.ifd-lab-topbar,.ifd-mobile-switch{flex:0 0 auto}
.ifd-lab-workspace{height:auto!important;min-height:0;flex:1}
.task-inline-link{font-weight:750;text-underline-offset:.14em}
.task-card>p,.task-checkpoint>p,.task-practice>p{color:#435765;line-height:1.5}
.task-card>h3,.task-checkpoint>h3,.task-practice>h3{margin:.95rem 0 .35rem;color:#173e54;font-size:.92rem}
.task-introduction:first-child{margin-top:0}
.task-checkpoint,.task-practice{margin-top:1rem;padding-top:.85rem;border-top:1px solid #d4dde4}
.task-checkpoint.is-complete{padding:.75rem;border:1px solid #c8ddd0;border-radius:.35rem;background:#f7fbf8}
.task-fields{margin:.65rem 0}
.task-inline-fields{display:flex;align-items:center;flex-wrap:wrap;gap:.4rem;margin:.65rem 0;color:#334a59}
.task-inline-fields label{display:inline-flex;align-items:center;margin:0}
.task-inline-fields label input{width:5rem}
.task-choices{display:grid;gap:.45rem;margin:.65rem 0;padding:0;border:0}
.task-choices legend{margin-bottom:.25rem;color:#334a59;font-size:.78rem;font-weight:750}
.task-choices label{display:flex;align-items:flex-start;gap:.55rem;margin:0;padding:.55rem;border:1px solid #b8c6d0;border-radius:.3rem;background:#fff;cursor:pointer;font-size:.84rem;font-weight:650}
.task-choices input{flex:0 0 auto;width:auto;margin:.15rem 0 0}
.task-finish-choice{display:grid;grid-template-columns:1fr 1.5fr;gap:.55rem;margin-top:1rem}
.task-result code,.task-card code{overflow-wrap:anywhere}
@media(max-width:480px){.task-finish-choice{grid-template-columns:1fr}}
@media(max-width:760px){body.ifd-lab-active{overflow:hidden}.ifd-router-lab{height:100vh;height:100dvh;min-height:0}.ifd-lab-workspace{height:auto!important;min-height:0;flex:1}}

/* Standalone device explorer shares the Home Gateway renderer with the labs. */
body.ifd-device-active .md-content__inner>h1,body.ifd-device-active .md-content__inner:before{display:none}
.ifd-router-lab.ifd-device-explorer{position:relative;inset:auto;z-index:auto;display:block;height:auto;min-height:80vh;overflow:visible;background:#e7edf3}
.ifd-device-topbar{display:flex;align-items:center;gap:1rem;flex-wrap:wrap;padding:.8rem 1rem;color:#fff;background:#0b1220}
.ifd-device-topbar a{color:#fff;text-decoration:underline}
.ifd-device-topbar>div{display:grid;line-height:1.3}
.ifd-device-topbar>div span{font-size:.8rem;color:#d4e0eb}
.ifd-device-topbar [role=status]{margin-left:auto;font-size:.85rem}
.ifd-device-access-card{display:flex;align-items:center;gap:1rem;flex-wrap:wrap;max-width:78rem;margin:1rem auto 0;padding:.8rem 1rem;border:1px solid #9fb7c8;border-radius:.4rem;background:#edf5f8}
.ifd-device-access-card>div{display:grid;gap:.2rem;min-width:min(100%,18rem);flex:1}.ifd-device-access-card>div span,.ifd-device-access-card>p{color:#526978;font-size:.8rem}.ifd-device-access-card dl{display:flex;gap:.7rem;flex-wrap:wrap;margin:0}.ifd-device-access-card dl>div{display:grid;gap:.1rem;padding:.35rem .55rem;border:1px solid #bdcbd5;border-radius:.3rem;background:#fff}.ifd-device-access-card dt{color:#526978;font-size:.7rem}.ifd-device-access-card dd{margin:0}.ifd-device-access-card>p{flex-basis:100%;margin:0}
.ifd-device-main{max-width:80rem;margin:0 auto;padding:1rem}
.ifd-device-explorer .gateway{min-height:65vh}
.gateway-empty-state{margin:.8rem 0 0;padding:.75rem;border-left:4px solid #718695;background:#eef2f4;color:#40535f}
@media(max-width:760px){.ifd-device-main{padding:.4rem}.ifd-device-access-card{margin:.4rem}.ifd-device-topbar [role=status]{margin-left:0}.ifd-device-explorer .gateway-nav{position:static}}

body.ifd-device-active .md-main__inner,body.ifd-device-active .md-content,body.ifd-device-active .md-content__inner{max-width:none;margin:0;padding:0}
body.ifd-device-active{overflow:auto}
body.ifd-device-active .md-content__inner>.headerlink,body.ifd-device-active .md-content__inner>p{display:none}