:root{--navy:#0c2439;--ink:#152d42;--muted:#596b7b;--teal:#087e77;--mint:#56e2d3;--line:#dce5ea;--bg:#f3f6f8}*{box-sizing:border-box}body{margin:0;color:var(--ink);background:var(--bg);font:16px/1.55 system-ui,-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif}button,input,select{font:inherit}button{cursor:pointer}button:disabled{cursor:default;opacity:.4}button,a,input,select,summary{touch-action:manipulation}button:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #168cdd;outline-offset:4px}[hidden]{display:none!important}.skip{position:fixed;top:-80px;left:10px;background:white;padding:10px;z-index:9}.skip:focus{top:10px}.rail{width:250px;background:var(--navy);color:#edf7fa;position:fixed;inset:0 auto 0 0;display:flex;flex-direction:column;padding:36px 20px}.brand{font-size:30px;letter-spacing:-1.3px;font-weight:760;padding:0 14px}.brand span{color:var(--mint)}.brand 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span{font-size:12px;color:var(--muted)}.lesson-layout,.practice-layout{display:grid;grid-template-columns:minmax(0,1.8fr) minmax(230px,1fr);gap:24px}.card{border:1px solid var(--line);background:white;border-radius:12px;padding:28px;box-shadow:0 4px 20px #0c243904}.card-top{display:flex;justify-content:space-between;align-items:center;font-size:11px;color:var(--muted);letter-spacing:1px}.card-top .eyebrow{margin:0}.step-tabs{display:flex;gap:9px;margin:24px 0 28px}.step-tabs button{flex:1;border:0;background:#eaf0f3;border-radius:4px;height:7px;padding:0}.step-tabs button.active{background:var(--teal)}.step-tabs button.done{background:#93cfca}.step-icon{width:50px;height:50px;display:grid;place-items:center;background:#e0f6f2;color:var(--teal);font-size:22px;border-radius:12px;margin-bottom:20px}.step-title{font-size:29px;letter-spacing:-.9px;margin-top:0}.step-body{min-height:200px}.check-points{padding-left:20px;color:var(--muted)}li{margin-bottom:12px}.step-tip{border-left:3px solid var(--teal);padding:10px 14px;background:#f2f9f8;font-size:14px}.lesson-actions{display:flex;justify-content:space-between;gap:16px;margin-top:26px;border-top:1px solid var(--line);padding-top:22px}.button{padding:11px 18px;border-radius:7px;font-weight:650;font-size:14px;min-height:44px}.primary{background:var(--teal);border:1px solid var(--teal);color:white}.primary:hover{background:#05655f}.secondary{border:1px solid #ccd9e1;background:white;color:var(--ink)}.secondary:hover{background:#f1f6f7}.side-note{background:var(--navy);color:#dfebf2;border-radius:12px;padding:30px;align-self:start}.side-note h2{color:white}.side-note p{font-size:15px;color:#c3d4df}.side-note .eyebrow{color:var(--mint)}.pilot-facts{display:flex;gap:40px;margin:28px 0}.pilot-facts strong{display:block;font-size:36px;color:white;font-weight:500;line-height:1.2}.pilot-facts span{font-size:12px;color:#a9bfce}.small{font-size:13px!important;line-height:1.6;color:var(--muted)}.takeaway{border-top:1px solid 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ul{padding-left:20px;font-size:14px;color:#c3d4df}footer{display:flex;justify-content:space-between;gap:20px;padding:30px 0;margin-top:30px;border-top:1px solid var(--line);font-size:12px;color:var(--muted)}@media(min-width:1500px){main{padding-top:36px}.lesson{padding:34px}}@media(max-width:1100px){.rail{width:212px;padding:28px 14px}.brand{font-size:26px}.shell{margin-left:212px}main{padding:24px}.topbar{padding:0 24px}.lesson-layout,.practice-layout{grid-template-columns:1.5fr 1fr}.side-note{padding:24px}.card{padding:24px}.video-card{padding:0}.video-card>div{padding:24px}}@media(max-width:850px){.rail{position:static;width:auto;padding:18px 20px}.brand{font-size:24px;padding:0}.brand small{display:none}.rail-bottom{display:none}nav{display:flex;gap:8px;margin-top:18px;overflow:auto;padding-bottom:4px}.nav{width:auto;min-width:max-content;padding:10px;font-size:13px}.nav span{display:none}.nav.active{box-shadow:inset 0 -2px var(--mint)}.shell{margin-left:0}.topbar{height:60px}.lesson-layout,.practice-layout,.launch-layout,.help-layout{grid-template-columns:1fr}.side-note{display:block}.pilot-facts{margin:20px 0}.step-body{min-height:0}.pagehead br{display:none}.video-card{grid-template-columns:1fr 1fr}.result-layout{grid-template-columns:1fr 1.2fr}.duration{display:none}}@media(max-width:600px){main{padding:18px 16px 0}.topbar{padding:0 16px;font-size:12px}.topbar .badge{font-size:9px}.slash{padding:0 5px}.notice{font-size:12px;margin-bottom:24px}.pagehead{margin-bottom:24px}h1{font-size:35px;letter-spacing:-1.3px}.lead{font-size:15px}.card,.side-note{padding:23px}.video-card{padding:0;grid-template-columns:1fr}.video-card video{min-height:0;aspect-ratio:16/9}.three-grid,.result-layout{grid-template-columns:1fr}.section-heading{align-items:start;gap:20px}.section-heading .muted{display:none}.card-top{font-size:10px}.step-title{font-size:26px}.quiz 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.video-card video{height:420px;min-height:0;max-height:420px}.brand small{font-size:12px;letter-spacing:1.3px}.nav{font-size:14px}.card-top,.card-top .eyebrow{font-size:12px}.eyebrow{font-size:12px}.rail-bottom .eyebrow{font-size:12px;letter-spacing:1px}@media(max-width:600px){.video-card video{height:420px;aspect-ratio:auto}.nav{font-size:14px}}
.portal-review-note{border:1px solid #dfc478;background:#fff8e5;border-radius:8px;padding:16px 20px;font-size:14px;margin-bottom:24px;color:#614c17}.portal-review-note strong{display:block;margin-bottom:4px}.portal-task-nav{display:flex;gap:8px;flex-wrap:wrap;margin:24px 0 28px}.portal-task-nav button{border:1px solid var(--line);border-radius:6px;background:#f3f6f8;padding:9px 12px;font-size:14px;color:var(--muted)}.portal-task-nav button[aria-current="step"]{background:var(--teal);border-color:var(--teal);color:white}.portal-task-layout{display:grid;grid-template-columns:minmax(220px,.9fr) minmax(0,1.5fr);gap:28px;align-items:start}.portal-task-layout h2{margin-top:0;font-size:27px}.portal-task-layout p,.portal-task-layout li{font-size:15px}.portal-task-layout ol{padding-left:22px;color:var(--muted)}.portal-figure{margin:0}.portal-figure button{display:block;width:100%;padding:0;border:1px solid #bccdd8;border-radius:8px;overflow:hidden;background:#fff;cursor:zoom-in}.portal-figure img{display:block;width:100%;height:auto}.portal-figure figcaption{font-size:12px;line-height:1.5;color:var(--muted);margin-top:10px}.portal-video-grid{display:grid;grid-template-columns:minmax(0,2fr) minmax(240px,1fr);gap:24px}.portal-player{padding:0;overflow:hidden}.portal-player video{display:block;width:100%;aspect-ratio:1610/760;background:#091f30}.portal-player p{padding:0 20px;margin-top:16px}.chapter-card{padding:24px}.chapter-card button{display:flex;width:100%;gap:15px;text-align:left;background:white;border:0;border-bottom:1px solid var(--line);padding:13px 0;font-size:14px;color:var(--ink)}.chapter-card button:hover{color:var(--teal)}.chapter-card button span{color:var(--teal);font-variant-numeric:tabular-nums}.chapter-card .small{margin-top:20px}.lightbox-top{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:15px}.lightbox-top h2{margin:0;font-size:20px}#portal-lightbox{width:min(96vw,1500px);max-height:95vh;border:1px solid var(--line);padding:20px;border-radius:12px;color:var(--ink)}#portal-lightbox::backdrop{background:#05182cdc}#portal-large-image{width:100%;height:auto;display:block}#portal-lightbox p{margin:12px 0 0}@media(max-width:1100px){.portal-task-layout{grid-template-columns:1fr}.portal-video-grid{grid-template-columns:1fr}.portal-task-nav{gap:6px}.portal-task-nav button{padding:8px 10px}.chapter-card{display:block}}@media(max-width:600px){.portal-review-note{font-size:13px;padding:14px}.portal-task-layout h2{font-size:24px}.portal-task-nav button{font-size:13px}.portal-tour{padding:20px}.lightbox-top h2{font-size:16px}#portal-lightbox{padding:12px}.portal-figure figcaption{font-size:12px}}

.brand img{display:block;width:100%;max-width:210px;height:auto}.quick-links{display:grid;grid-template-columns:1.3fr 1fr;gap:16px;margin:0 0 32px}.quick-link{display:flex;flex-direction:column;gap:3px;background:white;border:1px solid var(--line);border-radius:10px;padding:18px 22px;color:var(--ink);text-decoration:none;overflow-wrap:anywhere}.quick-link:hover{border-color:var(--teal);background:#f2f9f8}.quick-link .eyebrow{margin:0 0 3px;font-size:10px}.quick-link strong{font-size:18px}.quick-link>span:last-child{font-size:13px;color:var(--muted)}a:focus-visible{outline:3px solid #168cdd;outline-offset:4px}#portal-copy a{color:var(--teal);overflow-wrap:anywhere}@media(max-width:850px){.brand img{width:180px}}@media(max-width:600px){.quick-links{grid-template-columns:1fr;gap:10px;margin-bottom:24px}.quick-link{padding:15px 18px}}@media print{.quick-links{display:none}}

/* Brand header: preserve the supplied artwork and its natural proportions. */
.topbar{height:auto;min-height:112px;padding:20px 32px 20px 24px;gap:28px;background:linear-gradient(100deg,#000 0%,#000 36%,#0c2439 78%);color:#fff;border-bottom:3px solid #0099c4}.brand-masthead{flex:0 1 280px;min-width:190px}.brand-masthead img{display:block;width:100%;height:auto;max-width:280px}.header-title{display:flex;flex-direction:column;gap:3px;margin-right:auto}.header-title strong{font-size:20px;font-weight:650;letter-spacing:-.3px}.header-title span{font-size:14px;color:#c0d0da}.topbar .badge{background:#ffffff0d;color:#d5e8f1;border-color:#ffffff35;font-size:11px}.brand{padding:0 12px;letter-spacing:0}.brand>strong{font-size:28px;letter-spacing:1px;font-weight:700}.brand small{font-size:11px;letter-spacing:1.5px;line-height:1.5;margin-top:5px}.rail nav{margin-top:36px}@media(max-width:1100px){.topbar{gap:20px;padding:20px 24px}.brand-masthead{flex-basis:240px}.header-title span{max-width:170px}}@media(max-width:850px){.rail{padding:16px 20px}.brand{display:flex;align-items:baseline;gap:12px;padding:0}.brand>strong{font-size:20px}.brand small{display:block;margin:0}.rail nav{margin-top:14px}.topbar{min-height:100px}.brand-masthead{flex-basis:250px}.header-title span{max-width:none}}@media(max-width:600px){.topbar{display:grid;grid-template-columns:1fr auto;gap:12px 16px;padding:20px;background:linear-gradient(120deg,#000 0%,#000 45%,#0c2439 100%)}.brand-masthead{grid-column:1/-1;min-width:0;width:260px;max-width:100%}.header-title strong{font-size:18px}.header-title span{font-size:12px}.topbar .badge{font-size:10px}.brand small{font-size:10px}}

/* Supplied high-resolution AutoSonix wordmark. */
.topbar{background:#fff;color:var(--ink);border-bottom:1px solid var(--line);padding:24px 32px;gap:32px;min-height:124px}.brand-masthead{flex-basis:330px;min-width:220px}.brand-masthead img{max-width:330px}.header-title{border-left:1px solid var(--line);padding-left:28px}.header-title span{color:var(--muted)}.topbar .badge{background:#edf5f9;color:#416075;border-color:#d8e5ed}@media(max-width:1100px){.topbar{gap:20px;padding:24px}.brand-masthead{flex-basis:280px;min-width:200px}.header-title{padding-left:20px}.topbar .badge{font-size:10px}}@media(max-width:600px){.topbar{background:white;padding:22px 20px;gap:18px}.brand-masthead{width:310px;min-width:0;max-width:100%}.header-title{border:0;padding:0}.topbar .badge{font-size:10px}}

.quick-links{grid-template-columns:1.3fr 1fr 1fr}@media(max-width:1100px){.quick-links{grid-template-columns:1fr 1fr}.quick-links .quick-link:first-child{grid-column:1/-1}}@media(max-width:600px){.quick-links{grid-template-columns:1fr}}

.video-card{grid-template-columns:minmax(0,1.5fr) minmax(260px,1fr);align-items:center}.video-card video{display:block;align-self:center;width:100%;height:auto;min-height:0;max-height:none;aspect-ratio:16/9;object-fit:contain}.video-card>div{min-width:0;padding:24px 28px}@media(max-width:800px){.video-card{grid-template-columns:minmax(0,1fr)}.video-card video{height:auto;min-height:0;max-height:none;aspect-ratio:16/9}.video-card>div{padding:22px}}