:root{
  color-scheme:dark;
  --bg:#07110f;--bg-elev:#0b1714;--panel:#10201c;--panel-2:#142824;--text:#f0f7f4;--muted:#9db1aa;
  --line:#26413a;--accent:#62d7b3;--accent-2:#d7b96b;--danger:#ff8b8b;--warn:#f2cb72;--good:#73df9d;
  --shadow:0 20px 60px rgba(0,0,0,.28);--radius:18px;--radius-sm:12px;--focus:#d7b96b;
  --topbar:rgba(7,17,15,.92);--scrim:rgba(2,7,6,.76);--chip:#17302a;--input:#0c1b17;
}
html[data-theme="light"]{
  color-scheme:light;
  --bg:#f4f7f3;--bg-elev:#eef3ee;--panel:#ffffff;--panel-2:#f8fbf8;--text:#17221e;--muted:#5e7069;
  --line:#d8e2dc;--accent:#087f66;--accent-2:#8b6c20;--danger:#b83a3a;--warn:#8b641c;--good:#1f7f4d;
  --shadow:0 18px 46px rgba(30,56,46,.10);--focus:#7a5a10;--topbar:rgba(244,247,243,.94);--scrim:rgba(15,28,23,.44);
  --chip:#e8f3ee;--input:#ffffff;
}
*{box-sizing:border-box}
html,body{margin:0;min-height:100%;background:var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
body{font-size:16px;line-height:1.5}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
a{color:var(--accent)}
a:hover{text-decoration-thickness:2px}
:focus-visible{outline:3px solid var(--focus);outline-offset:3px}
.skip-link{position:fixed;left:16px;top:-80px;z-index:9999;background:var(--accent);color:#062019;padding:10px 14px;border-radius:10px;font-weight:800}
.skip-link:focus{top:12px}
.topbar{position:sticky;top:0;z-index:70;height:68px;display:flex;align-items:center;gap:14px;padding:0 18px;border-bottom:1px solid var(--line);background:var(--topbar);backdrop-filter:blur(14px)}
.brand{display:flex;align-items:center;gap:11px;min-width:0}
.brand-mark{width:38px;height:38px;border-radius:12px;background:linear-gradient(145deg,var(--accent),#2d8f79);display:grid;place-items:center;color:#05201a;font-weight:950;letter-spacing:-1px;box-shadow:inset 0 0 0 1px rgba(255,255,255,.18)}
.brand-copy{display:flex;flex-direction:column;line-height:1.1}
.brand-name{font-size:15px;font-weight:850;white-space:nowrap}
.brand-version{font-size:11px;color:var(--muted);letter-spacing:.05em;text-transform:uppercase;margin-top:4px}
.top-actions{margin-left:auto;display:flex;align-items:center;gap:8px}
.icon-btn,.button,.secondary,.ghost,.danger-btn{min-height:42px;border-radius:12px;border:1px solid var(--line);padding:9px 13px;background:var(--panel);color:var(--text);font-weight:760}
.button{background:var(--accent);color:#062019;border-color:transparent}
.button:hover{filter:brightness(1.05)}
.secondary{background:var(--panel-2)}
.ghost{background:transparent}
.danger-btn{border-color:color-mix(in srgb,var(--danger) 45%,var(--line));color:var(--danger);background:transparent}
.icon-btn{width:44px;padding:0;display:grid;place-items:center}
.app{display:grid;grid-template-columns:250px minmax(0,1fr);min-height:calc(100vh - 68px)}
.sidebar{border-right:1px solid var(--line);padding:18px 14px 28px;background:var(--bg-elev);position:sticky;top:68px;height:calc(100vh - 68px);overflow:auto;z-index:50}
.nav-section-label{font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);padding:10px 12px 6px;font-weight:850}
.nav-btn{width:100%;min-height:44px;border:0;background:transparent;color:var(--muted);text-align:left;border-radius:12px;padding:10px 12px;font-weight:720;display:flex;align-items:center;gap:10px}
.nav-btn:hover{background:var(--panel);color:var(--text)}
.nav-btn[aria-current="page"]{background:var(--chip);color:var(--text);box-shadow:inset 3px 0 0 var(--accent)}
.nav-meta{margin-top:18px;border-top:1px solid var(--line);padding:14px 12px;color:var(--muted);font-size:12px}
.main{min-width:0;padding:28px clamp(18px,3vw,46px) 60px}
.page{max-width:1240px;margin:0 auto}
.page-head{display:flex;align-items:flex-end;justify-content:space-between;gap:18px;margin-bottom:22px}
.eyebrow{font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--accent);font-weight:900}
h1,h2,h3{line-height:1.12;margin:0;color:var(--text)}
h1{font-size:clamp(28px,4vw,46px);letter-spacing:-.035em}
h2{font-size:clamp(21px,2.4vw,30px);letter-spacing:-.02em}
h3{font-size:18px}
.subhead{color:var(--muted);margin:8px 0 0;max-width:820px}
.grid{display:grid;gap:16px}
.grid.cards-4{grid-template-columns:repeat(4,minmax(0,1fr))}
.grid.cards-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid.cards-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:18px;box-shadow:0 1px 0 rgba(255,255,255,.02)}
.card.hero{padding:26px;background:linear-gradient(160deg,var(--panel),color-mix(in srgb,var(--panel-2) 86%,var(--accent) 14%));box-shadow:var(--shadow)}
.metric-label{font-size:12px;color:var(--muted);font-weight:800;letter-spacing:.05em;text-transform:uppercase}
.metric{font-size:30px;font-weight:900;letter-spacing:-.03em;margin-top:6px}
.metric.small{font-size:23px}
.muted{color:var(--muted)}
.status-line{display:flex;align-items:center;gap:8px;font-weight:800;margin-top:8px}
.status-dot{width:10px;height:10px;border-radius:999px;background:var(--muted)}
.status-dot.good{background:var(--good)}.status-dot.warn{background:var(--warn)}.status-dot.bad{background:var(--danger)}
.progress{height:10px;background:var(--bg-elev);border-radius:999px;overflow:hidden;border:1px solid var(--line)}
.progress>span{display:block;height:100%;background:var(--accent);width:0}
.section{margin-top:24px}
.section-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:12px}
.action-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}
.action{min-height:105px;text-align:left;padding:16px;border:1px solid var(--line);border-radius:16px;background:var(--panel);color:var(--text)}
.action:hover{border-color:color-mix(in srgb,var(--accent) 55%,var(--line));transform:translateY(-1px)}
.action strong{display:block;font-size:16px}.action span{display:block;color:var(--muted);font-size:13px;margin-top:5px}
.domain-row,.objective-row{display:grid;grid-template-columns:minmax(170px,1fr) minmax(180px,2fr) 72px;gap:12px;align-items:center;padding:10px 0;border-bottom:1px solid var(--line)}
.domain-row:last-child,.objective-row:last-child{border-bottom:0}
.pill,.chip{display:inline-flex;align-items:center;min-height:28px;padding:4px 9px;border-radius:999px;border:1px solid var(--line);background:var(--chip);font-size:12px;font-weight:780;color:var(--text)}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.toolbar{display:flex;flex-wrap:wrap;gap:10px;align-items:end}
.field{display:flex;flex-direction:column;gap:6px;min-width:140px}
.field label{font-size:12px;font-weight:800;color:var(--muted)}
input,select,textarea{background:var(--input);border:1px solid var(--line);color:var(--text);border-radius:11px;padding:10px 11px;min-height:42px}
textarea{min-height:110px;resize:vertical}
.session-shell{max-width:1000px;margin:0 auto}
.session-top{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:14px}
.session-top .spacer{margin-left:auto}
.timer{font-variant-numeric:tabular-nums;font-weight:900}
.question-card{padding:22px}
.question-meta{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:14px}
.question-text{font-size:clamp(19px,2.2vw,25px);font-weight:780;line-height:1.45;margin:8px 0 20px}
.case-intro{padding:14px;border:1px solid var(--line);border-radius:12px;background:var(--bg-elev);color:var(--muted);margin-bottom:16px}
.answers{display:grid;gap:10px}
.answer{width:100%;display:grid;grid-template-columns:36px minmax(0,1fr);gap:12px;align-items:start;text-align:left;border:1px solid var(--line);background:var(--panel-2);color:var(--text);border-radius:14px;padding:13px 14px;min-height:58px}
.answer:hover{border-color:color-mix(in srgb,var(--accent) 55%,var(--line))}
.answer.selected{box-shadow:inset 0 0 0 2px var(--accent);border-color:var(--accent)}
.answer.correct{border-color:var(--good);background:color-mix(in srgb,var(--panel) 84%,var(--good) 16%)}
.answer.incorrect{border-color:var(--danger);background:color-mix(in srgb,var(--panel) 84%,var(--danger) 16%)}
.answer-key{width:30px;height:30px;border-radius:9px;border:1px solid var(--line);display:grid;place-items:center;font-weight:900;background:var(--bg-elev)}
.feedback{margin-top:16px;padding:16px;border:1px solid var(--line);background:var(--bg-elev);border-radius:14px}
.feedback-title{font-weight:900;font-size:18px}
.feedback.correct .feedback-title{color:var(--good)}
.feedback.incorrect .feedback-title{color:var(--danger)}
.lesson{margin-top:12px;padding:14px;border-left:4px solid var(--accent-2);background:color-mix(in srgb,var(--panel) 90%,var(--accent-2) 10%);border-radius:0 12px 12px 0}
.remediation-actions{display:flex;flex-wrap:wrap;gap:9px;margin-top:14px}
.video-card{margin-top:14px;padding:14px;border:1px solid var(--line);border-radius:14px;background:var(--panel)}
.video-wrap{position:relative;padding-top:56.25%;overflow:hidden;border-radius:12px;background:#000;margin-top:10px}
.video-wrap iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.navigator{display:grid;grid-template-columns:repeat(10,1fr);gap:6px;margin-top:14px}
.nav-q{min-width:0;height:38px;border:1px solid var(--line);background:var(--panel-2);color:var(--text);border-radius:9px;font-size:12px;font-weight:800}
.nav-q.answered{box-shadow:inset 0 -3px 0 var(--accent)}
.nav-q.flagged::after{content:"•";color:var(--warn);margin-left:2px}
.nav-q.current{outline:2px solid var(--accent);outline-offset:1px}
.exam-lock{padding:10px 12px;border:1px solid var(--line);border-radius:12px;background:var(--bg-elev);color:var(--muted);font-size:13px}
.result-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.flashcard-stage{max-width:780px;margin:20px auto}
.flashcard{min-height:360px;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;padding:34px;border:1px solid var(--line);background:linear-gradient(160deg,var(--panel),var(--panel-2));border-radius:24px;box-shadow:var(--shadow)}
.flash-front{font-size:clamp(22px,3vw,34px);font-weight:850;line-height:1.3}
.flash-back{margin-top:22px;padding-top:20px;border-top:1px solid var(--line);font-size:18px}
.flash-actions{display:flex;justify-content:center;gap:10px;flex-wrap:wrap;margin-top:14px}
.lab-card{margin-bottom:14px}
.lab-item{padding:14px 0;border-bottom:1px solid var(--line)}
.lab-item:last-child{border-bottom:0}
.lab-options{display:grid;gap:8px;margin-top:9px}
.radio-row{display:flex;gap:10px;align-items:flex-start;padding:10px;border:1px solid var(--line);border-radius:11px;background:var(--panel-2)}
.radio-row input{min-height:auto;margin-top:4px}
.glossary-list{display:grid;gap:10px;margin-top:14px}
.glossary-entry{padding:13px;border:1px solid var(--line);border-radius:12px;background:var(--panel-2)}
.glossary-term{font-weight:900;font-size:16px}
.glossary-exp{color:var(--accent);font-weight:760}
.table-wrap{overflow:auto;border:1px solid var(--line);border-radius:14px}
table{width:100%;border-collapse:collapse;min-width:650px}
th,td{text-align:left;padding:11px 12px;border-bottom:1px solid var(--line);vertical-align:top}
th{font-size:12px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);background:var(--bg-elev)}
tr:last-child td{border-bottom:0}
.empty{padding:26px;text-align:center;color:var(--muted);border:1px dashed var(--line);border-radius:14px}
.callout{padding:14px 16px;border:1px solid var(--line);border-radius:14px;background:var(--bg-elev)}
.kbd{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;border:1px solid var(--line);border-bottom-width:2px;border-radius:6px;padding:1px 5px;background:var(--panel);font-size:12px}
.dialog{position:fixed;inset:0;z-index:200;display:none;align-items:center;justify-content:center;padding:18px;background:var(--scrim)}
.dialog.show{display:flex}
.dialog-panel{width:min(920px,100%);max-height:min(90vh,900px);overflow:auto;background:var(--panel);border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow);position:relative}
.dialog-head{position:sticky;top:0;z-index:2;display:flex;align-items:center;gap:12px;padding:14px 16px;border-bottom:1px solid var(--line);background:var(--panel)}
.dialog-head .spacer{margin-left:auto}
.dialog-body{padding:16px}
.account-panel{width:min(720px,100%)}
.account-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.account-form{display:grid;gap:12px}
.account-form .field{min-width:0}
.account-status{padding:12px;border-radius:12px;background:var(--bg-elev);color:var(--muted);margin:12px 0}
.auth-page{min-height:100vh;display:grid;place-items:center;padding:20px}
.auth-card{width:min(480px,100%);display:grid;gap:16px}
.auth-card .account-form,.auth-card form{display:grid;gap:12px}
.glossary-dialog .dialog-panel{width:min(760px,100%);height:min(82vh,820px);display:flex;flex-direction:column}
.glossary-dialog .dialog-body{display:flex;flex-direction:column;min-height:0;flex:1}
.glossary-results{overflow:auto;min-height:0;flex:1;margin-top:12px}
.source-dialog .dialog-panel{width:min(1120px,100%);height:min(92vh,960px);display:flex;flex-direction:column}
.source-controls{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.source-stage{flex:1;min-height:0;overflow:auto;background:#5e625f;display:grid;place-items:start center;padding:14px}
.source-stage img{display:block;max-width:none;width:100%;height:auto;box-shadow:0 8px 30px rgba(0,0,0,.3)}
.source-stage iframe{width:100%;height:100%;min-height:620px;border:0;background:white}
.source-meta{font-size:12px;color:var(--muted)}
.toast{position:fixed;left:50%;bottom:24px;z-index:400;transform:translate(-50%,20px);opacity:0;pointer-events:none;background:var(--text);color:var(--bg);padding:10px 14px;border-radius:999px;font-weight:800;transition:.2s}
.toast.show{opacity:1;transform:translate(-50%,0)}
.scrim{display:none}
.mobile-menu{display:none}
.hidden{display:none!important}
hr{border:0;border-top:1px solid var(--line);margin:18px 0}
body.exam-active #glossaryBtn,body.exam-active .nav-btn[data-view="glossary"]{display:none!important}
@media(max-width:1024px){
  .grid.cards-4,.action-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid.cards-3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .domain-row,.objective-row{grid-template-columns:minmax(120px,1fr) minmax(100px,2fr) 72px}
}
@media(max-width:768px){
  .topbar{height:62px;padding:0 10px}.brand-name{font-size:14px}.brand-version{font-size:10px}
  .mobile-menu{display:grid}
  .app{grid-template-columns:1fr;min-height:calc(100vh - 62px)}
  .sidebar{position:fixed;top:62px;left:0;bottom:0;width:min(84vw,310px);height:auto;transform:translateX(-105%);transition:transform .2s ease;box-shadow:var(--shadow)}
  body.nav-open .sidebar{transform:translateX(0)}
  .scrim{position:fixed;inset:62px 0 0;z-index:45;background:var(--scrim)}
  body.nav-open .scrim{display:block}
  .main{padding:20px 14px 48px}
  .page-head{align-items:flex-start;flex-direction:column}
  .grid.cards-4,.grid.cards-3,.grid.cards-2,.action-grid,.result-grid{grid-template-columns:1fr}
  .domain-row,.objective-row{grid-template-columns:1fr;gap:7px}
  .navigator{grid-template-columns:repeat(6,1fr)}
  .question-card{padding:16px}
  .question-text{font-size:20px}
  .dialog{padding:0}
  .dialog-panel{border-radius:0;width:100%;height:100%;max-height:none}
  .glossary-dialog .dialog-panel,.source-dialog .dialog-panel{width:100%;height:100%;max-height:none}
  .source-stage{padding:8px}
  .source-stage iframe{min-height:calc(100vh - 180px)}
  .top-actions .hide-mobile{display:none}
  .account-grid{grid-template-columns:1fr}
}
@media(max-width:430px){
  .brand-copy{max-width:178px}.brand-name{overflow:hidden;text-overflow:ellipsis}
  .top-actions{gap:5px}.icon-btn{width:40px}.topbar{gap:8px}
  .main{padding-left:10px;padding-right:10px}
  .card{padding:14px;border-radius:15px}
  .action-grid{gap:9px}
  .action{min-height:90px;padding:13px}
  .answer{padding:11px;grid-template-columns:32px minmax(0,1fr)}
  .navigator{grid-template-columns:repeat(5,1fr)}
  .session-top{position:sticky;top:62px;z-index:35;background:var(--bg);padding:8px 0;margin-top:-8px}
  .remediation-actions .button,.remediation-actions .secondary,.flash-actions button{flex:1 1 46%}
  .toolbar>.field{min-width:0;flex:1 1 45%}
  .account-button{padding-left:9px;padding-right:9px}
}
@media(max-width:340px){
  .brand-copy{display:none}
  .navigator{grid-template-columns:repeat(4,1fr)}
  .main{padding:14px 8px 40px}
  .topbar{padding:0 8px}
  .toolbar>.field{flex-basis:100%}
}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}