:root{
  --bg:#071321;
  --bg2:#091a2b;
  --panel:#0c2034;
  --panel2:#102a44;
  --line:#244d73;
  --line2:#326b9e;
  --text:#f3f7fc;
  --muted:#9fb9d5;
  --blue:#5ca9ff;
  --blue2:#2f82d8;
  --green:#67d8a3;
  --amber:#f5c66d;
  --red:#ff7d88;
  --shadow:0 18px 50px rgba(0,0,0,.22)
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;background:#a9d2f9}
body{
  margin:0;
  color:var(--text);
  background:
    radial-gradient(
      circle at 18% 12%,
      rgba(235,247,255,.72),
      transparent 31%
    ),
    radial-gradient(
      circle at 82% 72%,
      rgba(119,188,245,.30),
      transparent 34%
    ),
    linear-gradient(
      145deg,
      #b6dcfb 0%,
      #a9d2f9 48%,
      #9ecbf4 100%
    );
  font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  line-height:1.5
}
button,input,select{font:inherit}
button{cursor:pointer}
button:focus-visible,input:focus-visible,select:focus-visible,a:focus-visible{outline:3px solid rgba(92,169,255,.48);outline-offset:2px}
a{color:inherit}
.site-header{
  position:sticky;top:0;z-index:20;
  background:rgba(7,19,33,.9);
  border-bottom:1px solid rgba(50,107,158,.35);
  backdrop-filter:blur(18px)
}
.nav-shell{
  width:min(1180px,calc(100% - 36px));
  margin:0 auto;min-height:68px;
  display:flex;align-items:center;justify-content:space-between;gap:20px
}
.brand{font-weight:900;letter-spacing:-.03em;text-decoration:none;font-size:1.13rem}
.brand span{color:var(--blue)}
.header-actions{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.back-link,.reset-progress{
  border:1px solid var(--line);background:#0a1d30;color:var(--muted);
  border-radius:8px;padding:9px 13px;text-decoration:none;font-size:.82rem;font-weight:800
}
.reset-progress:hover,.back-link:hover{border-color:var(--blue);color:#fff}
main{width:min(1180px,calc(100% - 36px));margin:0 auto}
.hero{
  padding:82px 0 54px;
  display:grid;grid-template-columns:minmax(0,1.5fr) minmax(290px,.75fr);gap:48px;align-items:end
}
.eyebrow,.panel-kicker{
  display:block;color:var(--blue);font-size:.72rem;font-weight:900;letter-spacing:.16em;text-transform:uppercase
}
.hero h1{font-size:clamp(2.6rem,6vw,5.7rem);line-height:.94;letter-spacing:-.055em;margin:14px 0 22px;max-width:850px}
.hero-text{max-width:760px;color:var(--muted);font-size:1.08rem;line-height:1.75;margin:0}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:30px}
.primary-btn,.secondary-btn,.launch-btn,.action-btn,.hint-btn,.reset-lab-btn,.close-lab-btn,.mode-btn{
  min-height:44px;border-radius:8px;padding:10px 16px;font-weight:850;border:1px solid transparent
}
.primary-btn,.launch-btn,.action-btn{background:var(--blue2);border-color:#4c9ce9;color:#fff}
.primary-btn:hover,.launch-btn:hover,.action-btn:hover{background:#3f92e5}
.secondary-btn,.hint-btn,.reset-lab-btn,.close-lab-btn,.mode-btn{
  background:#0b1e31;color:var(--text);border-color:var(--line)
}
.secondary-btn:hover,.hint-btn:hover,.reset-lab-btn:hover,.close-lab-btn:hover,.mode-btn:hover{border-color:var(--blue)}
.compact{padding:9px 14px;min-height:42px}
.progress-panel{
  background:linear-gradient(145deg,rgba(16,42,68,.9),rgba(10,29,48,.94));
  border:1px solid var(--line);border-radius:14px;padding:24px;box-shadow:var(--shadow)
}
.progress-stat{display:flex;justify-content:space-between;align-items:baseline;padding:11px 0;border-bottom:1px solid rgba(50,107,158,.23)}
.progress-stat:last-of-type{border-bottom:0}
.progress-stat strong{font-size:1.12rem}
.stat-label{color:var(--muted);font-size:.8rem;font-weight:800}
.progress-bar{height:8px;background:#071522;border:1px solid #173d5d;border-radius:999px;overflow:hidden;margin-top:17px}
.progress-bar span{display:block;width:0;height:100%;background:linear-gradient(90deg,#3a91e4,#67d8a3);transition:width .35s ease}
.how-panel{
  margin:8px 0 48px;padding:26px;border:1px solid var(--line);border-radius:12px;background:rgba(12,32,52,.72)
}
.how-panel h2,.section-heading h2{margin:6px 0 0;font-size:clamp(1.55rem,3vw,2.25rem)}
.mode-explain-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:15px;margin-top:22px}
.mode-explain-grid article{border-left:2px solid var(--line2);padding:4px 0 4px 16px}
.mode-explain-grid strong{font-size:1rem}
.mode-explain-grid p{color:var(--muted);font-size:.9rem;margin:6px 0 0}
.track-section{padding:42px 0 74px}
.section-heading{display:flex;align-items:end;justify-content:space-between;gap:34px;margin-bottom:25px}
.section-heading>p{max-width:560px;color:var(--muted);margin:0}
.track-tabs{display:flex;gap:8px;flex-wrap:wrap;margin:24px 0}
.track-tab{
  min-height:44px;border:1px solid var(--line);background:#0a1b2c;color:var(--muted);
  border-radius:999px;padding:9px 16px;font-weight:850
}
.track-tab.active{background:#173a5d;color:#fff;border-color:#4388cf}
.activity-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.activity-card{
  display:none;background:linear-gradient(145deg,rgba(16,42,68,.94),rgba(10,29,48,.94));
  border:1px solid var(--line);border-radius:12px;padding:22px;min-height:300px
}
.activity-card.active-track{display:flex;flex-direction:column}
.activity-top{display:flex;justify-content:space-between;gap:12px;align-items:center}
.difficulty,.completion-badge{font-size:.69rem;font-weight:900;letter-spacing:.08em;text-transform:uppercase}
.difficulty.entry{color:var(--green)}
.completion-badge{color:var(--muted);letter-spacing:0;text-transform:none}
.completion-badge.done{color:var(--green)}
.activity-card h3{font-size:1.35rem;margin:25px 0 8px}
.activity-card p{color:var(--muted);margin:0 0 20px}
.skills{display:flex;flex-wrap:wrap;gap:7px;margin-bottom:25px}
.skills span{font-size:.72rem;color:#b9d3ed;border:1px solid #234c72;background:#0a1d30;border-radius:999px;padding:5px 8px}
.launch-btn{margin-top:auto;width:100%}
.roadmap{margin-top:28px;padding:23px;border:1px solid rgba(36,77,115,.75);background:rgba(8,24,39,.72);border-radius:12px}
.roadmap-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:13px;margin-top:16px}
.roadmap-grid>div{display:flex;flex-direction:column;gap:4px;padding:15px;background:#0a1b2c;border:1px solid #183b5a;border-radius:9px}
.roadmap-grid strong{font-size:.9rem}.roadmap-grid span{color:var(--muted);font-size:.8rem}
.lab-shell{padding:18px 0 70px}
.lab-header{
  display:flex;justify-content:space-between;gap:30px;align-items:end;
  padding:26px;background:linear-gradient(135deg,#0e2944,#0a1e32);border:1px solid var(--line);border-radius:14px 14px 0 0
}
.lab-header h2{font-size:clamp(1.7rem,4vw,2.7rem);margin:5px 0}
.lab-header p{margin:0;color:var(--muted)}
.lab-score{min-width:100px;text-align:right}
.lab-score span{display:block;color:var(--muted);font-size:.75rem;font-weight:800;text-transform:uppercase;letter-spacing:.12em}
.lab-score strong{font-size:2.2rem}
.mode-bar{
  display:flex;justify-content:space-between;align-items:center;gap:14px;flex-wrap:wrap;
  padding:14px;border:1px solid var(--line);border-top:0;background:#081a2a
}
.mode-buttons,.utility-buttons{display:flex;gap:8px;flex-wrap:wrap}
.mode-btn.active{background:#173a5d;border-color:#4388cf}
.hint-btn{color:var(--amber)}
.close-lab-btn{color:#ffabb2}
.feedback{
  display:flex;gap:10px;align-items:center;flex-wrap:wrap;
  margin:14px 0;padding:14px 16px;border:1px solid #214c72;border-radius:9px;background:#0a2034;color:var(--muted)
}
.feedback strong{color:var(--text)}
.feedback.error{border-color:#753845;background:#271820}.feedback.error strong{color:#ffb2ba}
.feedback.success{border-color:#27664d;background:#10291f}.feedback.success strong{color:#9bedc6}
.feedback.hint{border-color:#715d2f;background:#282313}.feedback.hint strong{color:#ffe3a3}
.guided-panel{margin:14px 0 18px;padding:20px;border:1px solid #3e729f;border-radius:10px;background:#0d2740}
.guided-head{display:flex;align-items:center;justify-content:space-between;gap:18px}
.guided-panel ol{margin:15px 0 0;padding-left:21px;color:#d7e7f5}
.guided-panel li{margin:9px 0;padding-left:4px}
.guided-panel li::marker{color:var(--blue);font-weight:900}
.lab-content{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:16px}
.lab-column{display:flex;flex-direction:column;gap:16px;min-width:0}
.lab-column.wide{grid-column:span 1}
.tool-panel,.terminal-panel,.knowledge-card{
  background:linear-gradient(145deg,#0c2034,#091a2b);border:1px solid var(--line);border-radius:11px;padding:20px
}
.tool-heading{display:flex;justify-content:space-between;gap:15px;align-items:center;margin-bottom:12px}
.tool-heading>div{display:flex;align-items:center;gap:10px}
.tool-heading h3{margin:0;font-size:1.05rem}
.step-number{
  width:27px;height:27px;border-radius:50%;display:grid;place-items:center;background:#173c61;color:#a9d2ff;font-size:.78rem;font-weight:900
}
.tool-status{font-size:.72rem;font-weight:900;color:var(--muted)}
.tool-status.good{color:var(--green)}
.tool-panel>p,.knowledge-card p{color:var(--muted);font-size:.9rem}
.network-stage{display:grid;grid-template-columns:repeat(4,1fr);gap:9px;margin:20px 0 13px}
.device{
  min-height:112px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;
  color:var(--text);background:#0a1a2a;border:1px solid #26547d;border-radius:9px;padding:10px
}
.device:hover{border-color:var(--blue)}
.device.selected{border-color:var(--amber);background:#2a2516}
.device.connected{box-shadow:inset 0 0 0 1px rgba(103,216,163,.45)}
.device-icon{font-size:1.65rem;color:var(--blue)}
.device small{color:var(--muted)}
.connection-list{display:flex;gap:7px;flex-wrap:wrap;min-height:30px;color:var(--muted);font-size:.8rem}
.connection-chip{border:1px solid #2f668f;background:#0c2942;color:#cce5fb;border-radius:999px;padding:6px 9px}
.ip-form{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.ip-form label,.field-label{display:flex;flex-direction:column;gap:6px;color:var(--muted);font-size:.78rem;font-weight:800}
input,select{
  width:100%;min-height:44px;border:1px solid #285679;border-radius:8px;background:#071724;color:#edf6ff;padding:10px 11px
}
.action-btn{margin-top:13px}
.terminal-panel{padding:0;overflow:hidden}
.terminal-top{height:42px;background:#0b2237;border-bottom:1px solid #244d73;display:flex;align-items:center;gap:6px;padding:0 12px}
.terminal-top>span{width:9px;height:9px;border-radius:50%;background:#49657d}.terminal-top strong{margin-left:5px;font-size:.78rem;color:#b8d3eb}
.terminal-output{
  min-height:250px;max-height:350px;overflow:auto;background:#050b10;color:#cfe2d5;padding:17px;
  font:13px/1.55 "SFMono-Regular",Consolas,"Liberation Mono",monospace;white-space:pre-wrap
}
.terminal-form{display:flex;align-items:center;gap:8px;background:#07131d;padding:10px}
.terminal-form span{font:12px Consolas,monospace;color:#8eb6d6}
.terminal-form input{font-family:Consolas,monospace;min-width:0;flex:1}
.terminal-form button{min-height:44px;background:#173c61;color:#fff;border:1px solid #3475ad;border-radius:7px;padding:8px 12px;font-weight:800}
.knowledge-card{border-left:3px solid #397eb9}
.knowledge-card h3{margin:6px 0}.knowledge-card p{margin-bottom:0}
.access-result{margin-top:14px;padding:12px;background:#071724;border:1px solid #1c4566;border-radius:8px;color:var(--muted);font-size:.85rem}
.log-table-wrap{overflow-x:auto}
.log-table{width:100%;border-collapse:collapse;min-width:620px;font-size:.83rem}
.log-table th,.log-table td{text-align:left;padding:10px;border-bottom:1px solid #183b5b}
.log-table th{color:#9fc5e7;font-size:.72rem;text-transform:uppercase;letter-spacing:.08em}
.suspicious-row{background:rgba(255,125,136,.035)}
.ok-text{color:var(--green)}.bad-text{color:#ff9ba4}
.mission-complete{text-align:center;margin-top:18px;padding:38px 22px;border:1px solid #2e7355;border-radius:13px;background:linear-gradient(145deg,#0d2b22,#0b2130)}
.complete-icon{width:66px;height:66px;display:grid;place-items:center;margin:0 auto 15px;border-radius:50%;background:#164c38;border:1px solid #409f77;color:#9ff0c9;font-size:2rem;font-weight:900}
.mission-complete h2{font-size:2rem;margin:7px 0}.mission-complete>p{color:var(--muted);max-width:650px;margin:0 auto}
.complete-stats{display:flex;justify-content:center;gap:12px;flex-wrap:wrap;margin:24px 0}
.complete-stats>div{min-width:150px;padding:13px;border:1px solid #2b6850;border-radius:8px;background:#0a2019}
.complete-stats span{display:block;color:#91b7a5;font-size:.72rem;font-weight:800}.complete-stats strong{font-size:1.35rem}
.complete-actions{display:flex;justify-content:center;gap:9px;flex-wrap:wrap}
.hidden{display:none!important}
footer{border-top:1px solid #16344f;color:#7895af;text-align:center;padding:28px 18px;font-size:.78rem}
@media (min-width:760px){
  .activity-grid .activity-card.active-track{grid-column:span 1}
  .activity-grid:has(.activity-card.active-track) .activity-card.active-track{display:flex}
}
@media (max-width:900px){
  .hero{grid-template-columns:1fr;padding-top:58px}
  .mode-explain-grid,.activity-grid,.roadmap-grid,.lab-content{grid-template-columns:1fr}
  .activity-card.active-track{display:flex}
  .section-heading{align-items:flex-start;flex-direction:column}
  .ip-form{grid-template-columns:1fr}
  .network-stage{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:600px){
  main,.nav-shell{width:min(100% - 24px,1180px)}
  .nav-shell{min-height:72px}
  .header-actions{justify-content:flex-end}.reset-progress{display:none}
  .hero{padding-top:44px}.hero h1{font-size:2.85rem}
  .hero-actions>*{width:100%}
  .track-tabs{display:grid;grid-template-columns:1fr}
  .track-tab{border-radius:8px}
  .lab-header{align-items:flex-start;flex-direction:column}.lab-score{text-align:left}
  .mode-bar{align-items:stretch}.mode-buttons,.utility-buttons{display:grid;grid-template-columns:1fr 1fr;width:100%}
  .utility-buttons .close-lab-btn{grid-column:span 2}
  .network-stage{grid-template-columns:1fr 1fr}
  .device{min-height:96px}
}

/* CLOUD SAVE / PLAYER ACCOUNT */
.account-btn{
  border:1px solid var(--line);background:#0a1d30;color:var(--text);
  border-radius:8px;padding:9px 13px;font-size:.82rem;font-weight:850
}
.account-btn:hover{border-color:var(--blue)}
.account-overlay{
  position:fixed;inset:0;z-index:100000;
  display:grid;place-items:center;padding:20px;
  background:rgba(2,10,18,.74);backdrop-filter:blur(8px)
}
.account-dialog{
  width:min(540px,100%);max-height:calc(100vh - 40px);overflow:auto;
  background:linear-gradient(145deg,#0c2034,#091a2b);
  border:1px solid var(--line2);border-radius:14px;padding:24px;
  box-shadow:0 26px 80px rgba(0,0,0,.42)
}
.account-dialog-head{display:flex;align-items:flex-start;justify-content:space-between;gap:18px}
.account-dialog h2{margin:6px 0 0;font-size:1.55rem}
.account-close{
  width:42px;height:42px;flex:0 0 42px;border-radius:8px;
  border:1px solid var(--line);background:#0a1d30;color:var(--muted);font-size:1.45rem
}
.account-close:hover{border-color:var(--blue);color:#fff}
.account-copy{color:var(--muted);font-size:.92rem;line-height:1.65;margin:18px 0}
.auth-mode-tabs{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:18px 0}
.auth-mode{
  min-height:44px;border:1px solid var(--line);border-radius:8px;background:#0a1d30;color:var(--muted);font-weight:850
}
.auth-mode.active{background:#173a5d;border-color:#4388cf;color:#fff}
.account-form{display:grid;gap:12px}
.account-form label{display:grid;gap:6px;color:var(--muted);font-size:.78rem;font-weight:800}
.account-form .primary-btn{width:100%;margin-top:4px}
.account-message{min-height:22px;margin:12px 0 0;color:var(--muted);font-size:.84rem}
.account-message.error{color:#ffabb2}.account-message.success{color:#9bedc6}
.account-note{margin:10px 0 0;color:#7895af;font-size:.76rem}
.signed-in-card{
  display:flex;align-items:center;gap:12px;margin-top:20px;padding:14px;
  border:1px solid #27664d;border-radius:9px;background:#10291f
}
.sync-dot{width:10px;height:10px;border-radius:50%;background:var(--green);box-shadow:0 0 12px rgba(103,216,163,.55)}
.account-mini-label{display:block;color:#87bfa4;font-size:.68rem;font-weight:900;letter-spacing:.1em}
.signed-in-card strong{display:block;margin-top:2px;word-break:break-word}
.cloud-actions{display:grid;grid-template-columns:1fr 1fr;gap:9px}
.danger-outline{color:#ffabb2!important;border-color:#753845!important}
.danger-outline:hover{border-color:#ff7d88!important}
@media (max-width:600px){
  .account-dialog{padding:19px}
  .cloud-actions{grid-template-columns:1fr}
}


/* UNLOCKED DIFFICULTY LEVEL SELECTOR */
.level-selector-panel{padding:24px}
.level-selector-head{display:flex;align-items:flex-end;justify-content:space-between;gap:18px;margin-bottom:18px}
.level-selector-head h3{margin:5px 0 0;font-size:1.25rem}
.unlocked-pill,.level-unlocked-status{
  display:inline-flex;align-items:center;justify-content:center;
  border:1px solid #2f7b5b;background:#10291f;color:#9bedc6;
  border-radius:999px;padding:6px 10px;font-size:.72rem;font-weight:900
}
.level-buttons{display:grid;grid-template-columns:repeat(2,1fr);gap:9px}
.level-btn{
  min-height:82px;text-align:left;border:1px solid #234c72;border-radius:9px;
  background:#0a1b2c;color:var(--muted);padding:12px
}
.level-btn span{display:block;color:var(--blue);font-size:.68rem;font-weight:900;letter-spacing:.08em;text-transform:uppercase}
.level-btn strong{display:block;color:var(--text);font-size:.86rem;margin-top:4px;line-height:1.25}
.level-btn:hover{border-color:var(--blue)}
.level-btn.active{background:#173a5d;border-color:#4388cf;box-shadow:inset 0 0 0 1px rgba(92,169,255,.16)}
.level-detail{margin-top:16px;padding:19px;border:1px solid #214c72;border-radius:10px;background:#0a2034}
.level-detail-top{display:flex;justify-content:space-between;align-items:flex-start;gap:18px}
.difficulty-level-label{color:var(--blue);font-size:.7rem;font-weight:900;letter-spacing:.11em}
.level-detail h3{margin:5px 0 5px;font-size:1.15rem}
.level-detail p{margin:0;color:var(--muted);font-size:.88rem}
.level-topic-grid{display:flex;flex-wrap:wrap;gap:7px;margin:16px 0}
.level-topic-grid span{font-size:.74rem;color:#c9e4fb;border:1px solid #285b83;background:#0b1e31;border-radius:999px;padding:6px 9px}
.level-jump-btn{margin-top:2px}
@media(max-width:900px){.level-buttons{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){
  .level-selector-head,.level-detail-top{align-items:flex-start;flex-direction:column}
  .level-buttons{grid-template-columns:1fr}
}


/* INDEPENDENT TRACKS + INTEGRATED IT CHALLENGE */
.difficulty.integrated{color:#b8a8ff}
.integrated-tab.active{border-color:#7e6ee8;background:#312d61}
.integrated-card{border-color:#4c4585!important}
.integrated-card .launch-btn{background:#4f56b8;border-color:#737ce1}
.integrated-card .launch-btn:hover{background:#6068ca}
.integrated-lab{display:block}
.scenario-brief{
  grid-column:1/-1;margin-bottom:16px;padding:22px;
  border:1px solid #4b5f8c;border-radius:11px;
  background:linear-gradient(145deg,#162744,#111f38)
}
.scenario-brief h3{margin:7px 0 8px;font-size:1.2rem}
.scenario-brief p{margin:0;color:var(--muted)}
.integrated-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.phase-panel{min-width:0}
.mini-log{
  display:grid;gap:5px;margin:12px 0 16px;padding:12px;
  background:#050b10;border:1px solid #263f57;border-radius:8px;
  color:#ffc4ca;font:12px/1.45 "SFMono-Regular",Consolas,monospace
}
.integrated-knowledge{margin-top:16px}
@media(max-width:950px){.integrated-grid{grid-template-columns:1fr}}


/* LIGHT PAGE CONTRAST */
.hero h1,
.section-heading h2{
  color:#0a2942
}
.hero-text,
.section-heading>p{
  color:#35556f
}
.track-section>.section-heading .panel-kicker{
  color:#1268ae
}
footer{
  color:#35556f;
  border-top-color:rgba(10,41,66,.22)
}

/* CONTEXTUAL LEARNING HELP */
.command-help-strip,
.concept-help-row{
  display:flex;align-items:center;gap:7px;flex-wrap:wrap
}
.command-help-strip{
  padding:9px 12px;background:#081724;border-bottom:1px solid #244d73
}
.command-help-strip>span{
  color:#85a9c8;font-size:.7rem;font-weight:900;text-transform:uppercase;letter-spacing:.08em;margin-right:2px
}
.concept-help-row{margin:10px 0 12px}
.explain-btn{
  min-height:30px;border:1px solid #3a739f;border-radius:999px;
  background:#102c45;color:#cbe6fb;padding:5px 9px;
  font-size:.72rem;font-weight:850;line-height:1.15
}
.explain-btn:hover{border-color:#6db7f0;background:#173b5c;color:#fff}
.explain-overlay{
  position:fixed;inset:0;z-index:95;display:grid;place-items:center;padding:20px;
  background:rgba(2,10,18,.76);backdrop-filter:blur(8px)
}
.explain-dialog{
  width:min(720px,100%);max-height:calc(100vh - 40px);overflow:auto;
  background:linear-gradient(145deg,#0c2034,#091a2b);
  border:1px solid #3978aa;border-radius:14px;padding:24px;
  box-shadow:0 28px 90px rgba(0,0,0,.46);color:var(--text)
}
.explain-dialog-head{display:flex;align-items:flex-start;justify-content:space-between;gap:20px}
.explain-dialog h2{margin:6px 0 0;font-size:1.7rem}
.explain-close{
  width:42px;height:42px;flex:0 0 42px;border:1px solid var(--line);
  border-radius:8px;background:#0a1d30;color:var(--muted);font-size:1.45rem
}
.explain-close:hover{border-color:var(--blue);color:#fff}
.explain-summary{color:#bdd4e8;line-height:1.65;margin:18px 0}
.explain-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.explain-grid article{
  padding:15px;border:1px solid #224c70;border-radius:9px;background:#0a1d30
}
.explain-grid span,.explain-example>span{
  display:block;color:var(--blue);font-size:.67rem;font-weight:900;letter-spacing:.1em;margin-bottom:7px
}
.explain-grid p{margin:0;color:#bdd4e8;font-size:.86rem;line-height:1.55}
.explain-example{
  margin-top:14px;padding:14px;border:1px solid #2c5d85;border-radius:9px;background:#06111b
}
.explain-example code{display:block;color:#b9ebce;font:13px/1.5 "SFMono-Regular",Consolas,monospace;white-space:pre-wrap}
@media(max-width:720px){
  .explain-grid{grid-template-columns:1fr}
  .explain-dialog{padding:18px}
  .command-help-strip{align-items:flex-start}
}


/* ALWAYS-VISIBLE SIMULATOR SITE NAVIGATION */
.site-header{
  position:fixed!important;
  top:0;left:0;right:0;
  width:100%;
  z-index:1000!important;
  background:#071321!important;
  border-bottom:1px solid #2f6694!important;
  box-shadow:0 8px 24px rgba(0,0,0,.18);
}
body{
  padding-top:68px;
}
.site-header .brand{
  color:#ffffff!important;
  font-size:1.22rem!important;
  font-weight:950!important;
  letter-spacing:-.03em;
}
.site-header .brand span{
  color:#5ca9ff!important;
}
.site-header .back-link{
  color:#ffffff!important;
  background:#12304d!important;
  border-color:#3e78aa!important;
}
.site-header .back-link:hover{
  background:#19446d!important;
  border-color:#6db7f0!important;
}
@media(max-width:700px){
  body{padding-top:78px}
  .nav-shell{
    width:min(100% - 20px,1180px);
    min-height:78px;
    gap:10px;
  }
  .site-header .brand{font-size:1.05rem!important}
  .site-header .back-link{
    padding:8px 10px;
    font-size:.74rem;
  }
}

#foundationPicker{display:block;margin:16px 0;color:var(--text)}
#foundationPicker[hidden]{display:none}
#foundationAssignment{display:block;max-width:100%;width:100%;margin-top:8px;padding:12px;border:1px solid #587087;border-radius:8px;background:#132334;color:#f1f5f9;font:inherit}