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24px;cursor:pointer;list-style:none;min-height:112px}.curriculum-track>summary::-webkit-details-marker{display:none}.track-symbol{color:var(--teal);display:flex;align-items:center;justify-content:center;flex:none;width:43px;height:43px;border:1px solid #c6d7cc;background:#eef3eb}.track-summary{display:block;flex:1;min-width:0}.track-summary>small{display:block;font:400 8px/1.5 var(--mono);letter-spacing:1.4px;color:#5d6f65}.track-summary>strong{display:block;font-size:19px;line-height:1.3;margin:5px 0;font-weight:500}.track-summary>span{display:block;font-size:12px;line-height:1.6;color:#5d6e65}.track-status{font:400 9px/1.6 var(--mono);color:#5e6e64;white-space:nowrap}.expand-symbol{flex:none;font:400 24px/1 var(--sans);width:20px;text-align:center;color:var(--teal)}.curriculum-track[open]>summary{background:#eef3eb}.curriculum-track[open] .expand-symbol{font-size:0}.curriculum-track[open] .expand-symbol:before{content:'−';font-size:24px}.track-topics{padding:0 24px 22px 85px;background:#fffef9}.topic-row{display:flex;align-items:center;gap:15px;padding:20px 0;border-top:1px solid #dce2d7;text-decoration:none}.topic-row.available:hover .topic-copy>strong{color:var(--teal);text-decoration:underline;text-underline-offset:5px}.topic-symbol{display:flex;color:#547163;flex:none}.topic-copy{flex:1;min-width:0}.topic-format{display:block;font:400 8px/1.5 var(--mono);letter-spacing:.75px;text-transform:uppercase;color:#606e67}.topic-copy>strong{display:block;font-size:16px;font-weight:500;line-height:1.4;margin:5px 0}.topic-copy>small{display:block;font-size:12px;line-height:1.6;color:#5e6e66}.topic-end{display:flex;align-items:center;gap:18px;flex:none;color:var(--teal)}.availability,.coming-soon{display:inline-block;font:400 8px/1.6 var(--mono);padding:4px 7px;border:1px solid #d0dbc9;background:#eef4e9;white-space:nowrap}.coming-soon{background:#f2f2ec;color:#626d64;border-color:#dce1d6}.topic-row.planned .topic-copy>strong{color:#5f6e65}.topic-row.planned 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var(--line);padding-top:20px;margin-top:24px}.briefing-next-note>b{font-size:14px;font-weight:500}.briefing-next-note>p{font-size:13px;color:#5b6f60;line-height:1.8}.briefing-controls{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:22px 30px;background:#f1f5ea;border-top:1px solid #d2dfc9}.briefing-controls .primary{font-size:13px;min-height:48px;padding:13px 18px}.briefing-controls .outline-button{font-size:13px;min-height:44px}
@media(max-width:1100px){.platform-page #platform,.platform-page #briefing{padding:0 30px}.platform-hero{gap:42px;padding:50px 0}.hero-overview h1>span{font-size:55px}.hero-overview h1>small{font-size:27px}.hero-actions{gap:15px}.curriculum-layout{grid-template-columns:200px minmax(0,1fr);gap:28px}.track-topics{padding-left:24px}.track-status{display:none}.briefing-layout{grid-template-columns:190px minmax(0,1fr);gap:28px}.feature-content h2{font-size:29px}}
@media(max-width:800px){.platform-page #platform,.platform-page #briefing{padding:0 24px}.platform-header{height:auto;min-height:98px;padding:20px 0;gap:20px}.platform-header nav{gap:17px}.platform-header nav a{font-size:12px}.platform-header nav a:last-child>svg{display:none}.platform-hero{grid-template-columns:1fr 1fr;gap:28px}.hero-overview h1>span{font-size:42px;letter-spacing:-1.5px}.hero-overview h1>small{font-size:24px}.hero-description{font-size:14px;line-height:1.8}.hero-actions{flex-direction:column;align-items:flex-start;gap:14px}.hero-footnote{font-size:11px}.feature-content{padding:22px}.feature-content h2{font-size:28px}.feature-label{padding:15px 18px;font-size:7px}.feature-label>span:last-child{display:none}.feature-meta{gap:12px}.curriculum-heading{align-items:flex-start;flex-direction:column;gap:18px;margin-bottom:28px}.curriculum-layout{grid-template-columns:1fr}.track-index{position:static;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 20px;margin-bottom:0}.track-index>.platform-eyebrow{grid-column:1/-1}.library-note{display:none}.track-index a{font-size:12px}.track-topics{padding-left:24px}.learning-approach{gap:20px}.learning-approach>div+div{padding-left:18px}.briefing-heading h1{font-size:36px}.briefing-layout{grid-template-columns:1fr}.briefing-index{position:static;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:6px}.briefing-index button{font-size:11px;padding:9px;gap:10px;min-height:62px}.briefing-index a{display:none}.briefing-format{display:none}}
@media(max-width:600px){.platform-page #platform,.platform-page #briefing{padding:0 20px}.platform-header{min-height:94px;flex-wrap:wrap;gap:8px;padding:20px 0 14px}.platform-header .assurance-brand-copy>b{font-size:16px}.platform-header .assurance-brand-copy>small{font-size:7px}.platform-header .assurance-brand>svg{width:27px}.platform-header nav{width:100%;justify-content:space-between;padding-top:8px;border-top:1px solid #dce1d5;margin-top:12px}.platform-header nav a{min-height:36px}.platform-hero{grid-template-columns:1fr;gap:38px;padding:38px 0 45px}.platform-eyebrow{font-size:8px}.hero-overview h1{margin:20px 0 24px}.hero-overview h1>span{font-size:48px;letter-spacing:-1.8px}.hero-overview h1>small{font-size:26px;margin-top:12px;line-height:1.25}.hero-description{font-size:15px}.hero-actions{gap:16px;margin-top:24px}.hero-actions .platform-primary{width:100%}.hero-footnote{margin-top:18px}.feature-art{aspect-ratio:2.7}.feature-label{font-size:8px}.feature-content h2{font-size:32px}.feature-meta{gap:22px}.curriculum-heading h2{font-size:28px;letter-spacing:-.4px}.curriculum-heading p{font-size:12px}.track-index{display:none}.curriculum-track>summary{gap:12px;padding:20px 16px;min-height:111px}.track-symbol{width:32px;height:36px}.track-symbol svg{width:20px}.track-summary>strong{font-size:17px}.track-summary>span{font-size:11px;line-height:1.7}.track-topics{padding:0 17px 8px}.topic-row{gap:10px;padding:20px 0;align-items:flex-start;position:relative}.topic-symbol{padding-top:22px}.topic-copy>strong{font-size:15px;padding-right:20px}.topic-copy>small{font-size:11px;padding-right:4px}.topic-format{font-size:7px;letter-spacing:.5px}.topic-end{display:block;position:absolute;top:20px;right:0}.topic-end .availability{display:none}.topic-end>svg{margin-top:20px;width:17px}.topic-end .coming-soon{font-size:7px;padding:2px 4px}.planned .topic-format{padding-right:86px}.planned .topic-copy>strong{padding-right:0}.learning-approach{grid-template-columns:1fr;gap:20px;margin-top:38px;padding:24px 0}.learning-approach>div+div{border-left:0;border-top:1px solid #d2ddcb;padding:20px 0 0}.learning-approach p{max-width:none}.platform-footer{flex-direction:column;gap:8px;font-size:9px}.briefing-main{padding-top:22px}.briefing-heading{margin:20px 0 26px}.briefing-heading h1{font-size:34px}.briefing-layout{gap:20px}.briefing-index{grid-template-columns:repeat(2,minmax(0,1fr))}.briefing-index button{font-size:11px;min-height:54px}.briefing-progress{padding:17px 20px;gap:18px}.briefing-progress>span{font-size:8px}.briefing-body{padding:25px 20px}.briefing-body h2{font-size:23px}.briefing-lead{font-size:15px}.briefing-support{font-size:13px}.briefing-compare{gap:10px}.briefing-compare>div{padding:18px 12px;gap:13px}.briefing-compare b{font-size:13px}.briefing-compare p{font-size:10px}.briefing-flow{flex-direction:column;gap:10px}.briefing-flow>div{width:100%;padding:15px;flex-direction:row;flex-wrap:wrap;gap:12px;text-align:left;justify-content:flex-start}.briefing-flow>div small{width:100%;padding-left:40px}.briefing-flow>span{transform:rotate(90deg);line-height:16px}.briefing-flow b{font-size:14px}.answer-illustration{gap:10px;padding:20px 8px}.answer-illustration b{font-size:12px}.answer-illustration span{font-size:10px}.answer-illustration>span{font-size:26px}.trust-illustration{padding:22px 17px;gap:17px}.trust-illustration b{font-size:15px}.briefing-takeaway{padding:17px 15px}.briefing-takeaway b{font-size:13px}.briefing-controls{padding:20px;gap:16px}.briefing-controls .platform-primary{font-size:12px;padding:12px;gap:12px;min-height:48px}.trust-list{grid-template-columns:1fr}}
@media(prefers-reduced-motion:reduce){.platform-page *{scroll-behavior:auto!important;animation:none!important;transition:none!important}.platform-primary:hover,.platform-primary:active{transform:none}}
.exam-locked{opacity:.55;cursor:not-allowed}
.exam-locked-badge{display:inline-flex;align-items:center;gap:.5rem;opacity:.6;font-family:var(--mono,monospace);letter-spacing:.08em;text-transform:uppercase;font-size:.8rem}

/* Keep Back/Continue visible while reading a briefing section. */
.check-context-illustrated{display:grid;grid-template-columns:minmax(0,1fr) 224px;gap:24px;align-items:center}
.check-context-copy{min-width:0}
.check-scene{margin:0;padding-left:20px;border-left:1px solid var(--line);color:var(--ink)}
.check-scene ol{list-style:none;margin:0;padding:0;display:grid;gap:22px}
.check-scene li{position:relative;display:flex;align-items:center;gap:10px;min-height:42px;min-width:0}
.check-scene li+li:before{content:'↓';position:absolute;top:-23px;left:14px;font-size:16px;line-height:22px;color:var(--muted)}
.check-scene-symbol{display:grid;place-items:center;width:40px;height:40px;flex:none;border:1px solid var(--line);background:var(--white);color:var(--teal);border-radius:4px}
.check-scene-copy{min-width:0}
.check-scene b{display:block;font-size:12px;line-height:1.4;font-weight:500}
.check-scene small{display:block;font-size:11px;line-height:1.4;color:var(--muted);margin-top:3px}
@media(max-width:800px){
 .check-context-illustrated{grid-template-columns:minmax(0,1fr);gap:16px}
 .check-scene{border-left:0;border-top:1px solid var(--line);padding:14px 0 0}
 .check-scene ol{grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
 .check-scene li{flex-direction:column;gap:7px;text-align:center;align-items:center}
 .check-scene li+li:before{content:'→';top:9px;left:-17px}
}
.briefing-controls{position:sticky;bottom:0;z-index:5;box-shadow:0 -6px 14px rgba(18,46,61,.06)}
.check-intro{max-width:720px;margin:-18px 0 26px}.check-theme{font:400 9px/1.5 var(--mono);letter-spacing:1px;color:var(--teal);text-transform:uppercase;display:block;margin-bottom:10px}.check-context{background:#f1f4e9;border:1px solid #ccd9c5;padding:20px 22px;margin:0 0 24px}.check-context p{margin:6px 0 14px;font-size:14px;line-height:1.7;color:#375c57}.check-context p:last-child{margin-bottom:0}.check-context blockquote{margin:0 0 14px;padding:14px 18px;border-left:3px solid var(--navy);background:#fffef9;font:400 15px/1.6 Georgia,serif;color:var(--ink)}.check-prompt{font-size:17px;font-weight:500;line-height:1.5;margin:0 0 16px}.check-options{display:flex;flex-direction:column;gap:10px;margin-bottom:22px}.check-option{display:flex;justify-content:flex-start;width:100%;gap:14px;align-items:flex-start;text-align:left;padding:14px 16px;border:1px solid #c6d7c2;background:#fffef9;font:inherit;font-size:14px;line-height:1.55;color:var(--ink);cursor:pointer;min-height:48px}.check-option .mono{font-size:12px;color:var(--teal);flex:none;margin-top:2px}.check-option:hover:not(:disabled){border-color:var(--teal)}.check-option.selected{border-color:var(--teal);background:#e9f0e6;box-shadow:inset 3px 0 0 var(--teal)}.check-option.correct{border-color:var(--teal);background:#e3efe4}.check-option.incorrect{border-color:var(--red);background:#f8ebe6}.check-option:disabled{cursor:default}.check-feedback{padding:16px 20px;margin-bottom:16px;border-left:3px solid var(--teal);background:#eef4ec}.check-feedback.is-incorrect{border-left-color:var(--red);background:#f8efe9}.check-feedback b{font-size:14px;font-weight:600}.check-feedback p{margin:6px 0 0;font-size:13px;line-height:1.7;color:#4c6660}.check-references{margin-top:16px;font-size:12px;color:#596f64}.check-references summary{cursor:pointer;min-height:36px;display:flex;align-items:center;color:var(--teal)}.check-references li{margin:6px 0;line-height:1.6}.check-done{padding:40px 30px}.check-done h2{margin-top:10px}
.check-landing .check-tutorial-button{display:flex;align-items:center;justify-content:space-between;gap:16px;width:100%;max-width:520px;margin-top:24px;padding:18px 22px}
.check-landing .check-tutorial-button span{flex:1;text-align:center;font-weight:600}
.check-landing-note{margin-top:10px;color:var(--muted,#5b6b66)}
.check-tutorial-table{overflow-x:auto;margin-top:18px}
.check-tutorial-table table{width:100%;border-collapse:collapse;font-size:15px}
.check-tutorial-table th,.check-tutorial-table td{text-align:left;vertical-align:top;padding:10px 12px;border-bottom:1px solid var(--line,#d7ddd8)}
.check-tutorial-table thead th{font-family:var(--mono,monospace);font-size:12px;letter-spacing:.08em;text-transform:uppercase}
.check-context code{display:block;margin:8px 0;padding:10px 12px;border-left:3px solid var(--danger,#c8462f);background:rgba(200,70,47,.06);font-size:13px;white-space:normal;word-break:break-word}
.pi-context{margin:6px 0 16px;color:var(--ink);font-size:17px}
.pi-tag{display:flex;align-items:center;gap:6px;font-family:var(--mono);font-size:11px;letter-spacing:.1em;color:var(--teal);margin-bottom:6px}
.pi-tag-red{color:var(--red)}
.pi-flow{display:grid;grid-template-columns:minmax(0,1.6fr) auto minmax(0,.6fr) auto minmax(0,1fr);gap:12px;align-items:center;margin:0 0 22px}
.pi-arrow{color:var(--muted);font-size:22px}
.pi-source{border:1px solid var(--line);background:var(--white);box-shadow:0 2px 0 var(--line)}
.pi-source-bar{display:flex;align-items:center;gap:8px;padding:8px 12px;border-bottom:1px solid var(--line);background:var(--teal-soft);font-size:12px}
.pi-source-bar .mono{font-size:11px;letter-spacing:.08em;color:var(--teal)}
.pi-source-bar small{color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.pi-visible{padding:12px 14px 6px}.pi-visible p{margin:2px 0;font-size:14px;color:var(--muted)}.pi-visible .pi-strong{color:var(--ink);font-weight:600}
.pi-hidden{margin:8px 12px 12px;padding:10px 12px;border:1px dashed var(--red);background:var(--red-soft)}
.pi-hidden .pi-tag{color:var(--red);text-transform:uppercase}
.pi-hidden code,.pi-tv code{display:block;font-family:var(--mono);font-size:12.5px;line-height:1.5;color:var(--ink);white-space:normal}
.pi-ai{display:flex;flex-direction:column;align-items:center;text-align:center;gap:4px}
.pi-ai-symbol{display:grid;place-items:center;width:52px;height:52px;border:1px solid var(--line);background:var(--white);color:var(--teal)}
.pi-ai small{color:var(--muted);font-size:12px}
.pi-output{border:1px solid var(--line);border-left:3px solid var(--red);background:var(--white);padding:12px 14px}
.pi-output p{margin:0 0 12px;font-weight:600;color:var(--ink)}
.pi-action{display:flex;align-items:center;gap:6px;margin-top:6px;padding:6px 8px;background:var(--red-soft);color:var(--red);font-size:13px;font-weight:600}
.pi-tv{margin:20px 0 4px}
.pi-tv-row{display:flex;flex-wrap:wrap;align-items:center;gap:10px}.pi-tv-row>span{color:var(--muted)}
.pi-chip{padding:10px 14px;border:1px solid var(--line);background:var(--white);font-size:14px;font-weight:600;color:var(--ink)}
.pi-chip-red{border-color:var(--red);background:var(--red-soft);color:var(--red)}
.pi-tv-cols{display:grid;grid-template-columns:1fr 1fr;gap:18px}.pi-tv-cols>div{border:1px solid var(--line);padding:14px;background:var(--white)}
.pi-tv-cols code{margin-top:12px;color:var(--muted)}
.pi-tv-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.pi-carrier{display:flex;flex-direction:column;align-items:center;gap:10px;padding:18px 10px;border:1px solid var(--line);background:var(--white);color:var(--teal);text-align:center}.pi-carrier b{color:var(--ink);font-size:14px}
.pi-window-box{display:flex;flex-direction:column;gap:8px;padding:14px;border:2px solid var(--ink);background:var(--white);max-width:560px}
.pi-window small{display:block;margin-top:8px;color:var(--muted)}
@media(max-width:860px){.pi-flow{grid-template-columns:1fr}.pi-arrow{transform:rotate(90deg);justify-self:center}.pi-ai{flex-direction:row}.pi-tv-cols,.pi-tv-grid{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.pi-tv-cols{grid-template-columns:1fr}}
.check-tutorial-list{margin:16px 0 0;padding-left:22px;font-size:15px;line-height:1.7;color:#375c57}.check-tutorial-list li{margin:6px 0}.check-sources{margin:18px 0 0}.check-sources ul{padding-left:18px}.check-sources li{margin:12px 0;line-height:1.55}.check-sources li p{margin:4px 0 0;font-size:13px;color:#596f64}
.hv-tv{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin:18px 0 0}
.briefing-card>.check-sources{margin:14px 30px}
.check-tutorial-image{margin:22px 0 6px;border:1px solid var(--line);overflow:hidden;background:var(--navy,#10263b)}.check-tutorial-image img{display:block;width:100%;height:auto;aspect-ratio:2/1;max-height:400px;object-fit:cover}

/* Full-width briefing artwork, without cropping the learning concepts. */
.briefing-illustration{margin:24px 0;border:1px solid var(--line);background:var(--white)}
.briefing-illustration img{display:block;width:100%;height:auto;aspect-ratio:2/1;object-fit:contain}
.briefing-illustration figcaption{padding:12px 16px;border-top:1px solid var(--line);font-size:13px;line-height:1.6;color:var(--muted);background:var(--teal-soft)}

/* Host-owned learner audience control. */
.learner-track-switch{display:flex;flex-wrap:wrap;gap:0;margin:28px 0 0;padding:0;border:0;max-width:570px}.learner-track-switch legend{font:400 10px/1.5 var(--mono);color:var(--teal);margin-bottom:10px;letter-spacing:0}.learner-track-switch label{display:flex;align-items:center;gap:9px;padding:12px 14px;min-height:48px;border:1px solid var(--line);background:var(--white);font-size:13px;cursor:pointer}.learner-track-switch label:has(input:checked){background:var(--teal-soft);border-color:var(--teal);color:var(--teal);font-weight:600}.learner-track-switch input{accent-color:var(--teal);width:16px;height:16px;flex:none}.learner-track-switch label:focus-within{outline:2px solid var(--teal);outline-offset:3px}@media(max-width:600px){.learner-track-switch{display:grid;grid-template-columns:1fr;width:100%}}
/* Track 01 case-study walkthrough */
.case-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:14px 0}
.case-block{border:1px solid var(--line);border-radius:6px;padding:14px 16px;background:var(--white)}
.case-block p{margin:6px 0 0}
.case-cause{border-left:3px solid var(--red,#b42318)}
.case-flow{margin:8px 0 18px}
.case-flow ol{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}
.case-node{position:relative;display:flex;flex-direction:column;align-items:center;text-align:center;gap:6px;padding:14px 8px;border:1px solid var(--line);border-radius:6px;background:var(--white)}
.case-node+.case-node:before{content:'→';position:absolute;left:-13px;top:50%;transform:translateY(-50%);color:var(--muted);font-size:14px}
.case-node-symbol{display:grid;place-items:center;width:44px;height:44px;border-radius:50%;border:1px solid var(--line);color:var(--teal)}
.case-node b{font-size:12px;font-weight:600;line-height:1.3}
.case-node small{font-size:11px;color:var(--muted);line-height:1.3}
.case-node.is-risk{border-color:var(--red,#b42318)}
.case-node.is-risk .case-node-symbol{color:var(--red,#b42318);border-color:var(--red,#b42318)}
.case-node.is-safe{border-color:var(--teal);border-style:dashed}
.case-node.is-safe .case-node-symbol{background:var(--teal);color:var(--white);border-color:var(--teal)}
@media (max-width:720px){.case-grid{grid-template-columns:1fr}.case-flow ol{grid-template-columns:1fr 1fr}.case-node+.case-node:before{display:none}}
.case-grid>.briefing-audio{grid-column:1/-1}
.early-access-badge{display:inline-block;margin-left:.5em;padding:.15em .55em;border:1px solid currentColor;border-radius:999px;font-size:.6em;letter-spacing:.08em;font-weight:700;vertical-align:middle;opacity:.85}