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0}.stack>*+*{margin-top:16px}.stack-sm>*+*{margin-top:8px}.stack-lg>*+*{margin-top:32px}.row{align-items:center;gap:16px;display:flex}.row-between{justify-content:space-between;align-items:center;gap:16px;display:flex}.row-top{align-items:flex-start}.wrap-row{flex-wrap:wrap}.spacer{flex:1}.grid{gap:20px;display:grid}.g2{grid-template-columns:repeat(2,minmax(0,1fr))}.g3{grid-template-columns:repeat(3,minmax(0,1fr))}.g4{grid-template-columns:repeat(4,minmax(0,1fr))}.g-auto{grid-template-columns:repeat(auto-fill,minmax(260px,1fr))}.sidebar-layout{grid-template-columns:230px 1fr;align-items:start;gap:32px;display:grid}.muted{color:var(--muted)}.small{font-size:.875rem}.xs{font-size:.78rem}.big{font-size:1.125rem}.bold{font-weight:600}.center{text-align:center}.right{text-align:right}.upper{text-transform:uppercase;letter-spacing:.08em}.eyebrow{font-family:var(--font-display);text-transform:uppercase;letter-spacing:.14em;color:var(--accent-2);font-size:.75rem;font-weight:600}.display{font-family:var(--font-display)}.lead{color:var(--muted);max-width:62ch;font-size:1.15rem}.pre-wrap{white-space:pre-wrap}.truncate{text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.nowrap{white-space:nowrap}.prose p+p{margin-top:1em}.prose ul{padding-left:1.3em;list-style:outside}.prose ol{padding-left:1.3em;list-style:decimal}.prose li+li{margin-top:.35em}.prose h2,.prose h3{margin:1.5em 0 .5em}.prose a{color:var(--accent-2);text-underline-offset:3px;text-decoration:underline}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:22px}.card-2{background:var(--surface-2);border-color:#0000}.card-hover{transition:border-color .15s,box-shadow .15s,transform .15s}.card-hover:hover{border-color:var(--border);box-shadow:var(--shadow);transform:translateY(-2px)}.card-tight{padding:14px 16px}.panel-head{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;gap:16px;margin-bottom:18px;padding-bottom:14px;display:flex}.divider{background:var(--border);height:1px;margin:20px 0}.btn{border-radius:var(--pill);font-family:var(--font-display);cursor:pointer;text-align:center;touch-action:manipulation;border:1px solid #0000;justify-content:center;align-items:center;gap:8px;padding:10px 20px;font-size:.92rem;font-weight:600;transition:background .15s,border-color .15s,color .15s,opacity .15s;display:inline-flex}.btn-primary{background:var(--ink);color:var(--ink-contrast)}.btn-primary:hover{background:color-mix(in srgb, var(--ink) 85%, 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#0000001f}.badge-tile.locked{opacity:.35;filter:grayscale(.6)}.badge-glyph{border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:58px;height:58px;display:flex}.bar{background:var(--surface-2);border-radius:999px;height:8px;overflow:hidden}.bar>span{background:var(--accent);border-radius:999px;height:100%;transition:width .4s;display:block}.bar-thin{height:5px}.bar-success>span{background:var(--success)}.ladder{flex-direction:column;gap:10px;display:flex}.rung{border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);grid-template-columns:48px 1fr auto;align-items:start;gap:16px;padding:16px;display:grid}.rung-num{width:40px;height:40px;font-family:var(--font-display);background:color-mix(in srgb, currentColor 14%, transparent);border:1px solid;border-radius:10px;place-items:center;font-size:1rem;font-weight:700;display:grid}.rung.state-EARNED{border-color:var(--success)}.rung.state-READY{border-color:var(--accent)}.rung.state-NEXT{border-color:var(--accent-2)}.rung.state-LOCKED{opacity:.55}.gate-list{flex-direction:column;gap:5px;margin-top:10px;display:flex}.gate{align-items:flex-start;gap:8px;font-size:.86rem;display:flex}.gate .tick{flex-shrink:0;width:16px;font-weight:700}.gate.met{color:var(--success)}.gate.unmet{color:var(--muted)}.topbar{z-index:60;background:var(--bg);border-bottom:1px solid var(--border);position:sticky;top:0}.topbar-inner{align-items:center;gap:22px;height:68px;display:flex}.wordmark{font-family:var(--font-display);letter-spacing:-.02em;align-items:baseline;gap:2px;font-size:1.16rem;font-weight:700;display:inline-flex}.wordmark .mark-a{color:var(--text)}.wordmark .mark-b{color:var(--accent)}.topbar .wordmark{flex:none}.brand-logo{width:auto;height:34px;display:block}.footer 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var(--border);box-shadow:var(--shadow);align-items:flex-start;gap:12px;padding:12px 14px;font-size:.9rem;animation:.2s flash-in;display:flex}@keyframes flash-in{0%{opacity:0;transform:translateY(-6px)}}.flash-success{border-left:3px solid var(--success)}.flash-error{border-left:3px solid var(--danger)}.flash-warning{border-left:3px solid var(--warning)}.flash-info{border-left:3px solid var(--accent-2)}.banner{text-align:center;background:var(--surface-2);border-bottom:1px solid var(--border);color:var(--muted);padding:9px 0;font-size:.82rem}.banner strong{color:var(--text)}.banner-warn{background:color-mix(in srgb, var(--warning) 14%, var(--bg));color:var(--text)}.hero{padding:84px 0 68px;position:relative;overflow:hidden}.hero:before{content:"";background:radial-gradient(closest-side, color-mix(in srgb, var(--accent) 12%, transparent), transparent);pointer-events:none;z-index:0;height:620px;position:absolute;inset:-55% 40% auto 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th{background:var(--surface-2);text-transform:uppercase;letter-spacing:.07em;color:var(--muted);border-bottom:1px solid var(--border);padding:11px 14px;font-size:.74rem;font-weight:600}table.data td{border-bottom:1px solid var(--border);vertical-align:middle;padding:11px 14px}table.data tr:last-child td{border-bottom:0}table.data tbody tr:hover{background:var(--surface-2)}.tabs{flex-wrap:wrap;gap:8px;margin-bottom:26px;display:flex}.tabs a{color:var(--text);border-radius:var(--pill);background:var(--surface-2);padding:8px 16px;font-size:.88rem;font-weight:500}.tabs a:hover{background:color-mix(in srgb, var(--surface-2) 70%, var(--border))}.tabs a.active{background:var(--ink);color:var(--ink-contrast)}.lesson-layout{grid-template-columns:280px 1fr;align-items:start;gap:32px;display:grid}.lesson-nav{overscroll-behavior:contain;max-height:calc(100vh - 110px);position:sticky;top:84px;overflow-y:auto}.lesson-nav 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var(--border);border-radius:var(--radius);background:var(--surface);width:100%;height:auto;display:block}.lesson-video{margin-bottom:22px}.lesson-layout>article{min-width:0}.lesson-body table{border-collapse:collapse;max-width:100%;font-size:.95rem;display:block;overflow-x:auto}.lesson-body th,.lesson-body td{border:1px solid var(--border);text-align:left;padding:7px 10px}.lesson-body pre{background:var(--surface-2);border-radius:var(--radius);padding:12px 14px;overflow-x:auto}.brief{border-left:3px solid var(--accent);background:var(--surface-2);border-radius:0 var(--radius) var(--radius) 0;padding:16px 18px}.verified-tick{vertical-align:middle;background:#1a9aef;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:16px;height:16px;margin-left:4px;display:inline-flex;position:relative;top:-1px}.verified-tick svg{width:10px;height:10px}.verified-tick-lg{width:22px;height:22px}.verified-tick-lg svg{width:14px;height:14px}.xp-overlay{z-index:9999;background:#0009;justify-content:center;align-items:center;padding:20px;display:none;position:fixed;inset:0}.xp-card{background:var(--surface);text-align:center;opacity:0;border-radius:20px;width:100%;max-width:340px;padding:44px 64px;transition:transform .25s cubic-bezier(.34,1.56,.64,1),opacity .2s;transform:scale(.7);box-shadow:0 24px 60px #0006}.xp-num{color:var(--accent);font-size:3.6rem;font-weight:900;line-height:1}.xp-unit{color:var(--accent);letter-spacing:.05em;font-size:1.1rem;font-weight:700}.xp-label{color:var(--fg);margin-top:14px;font-size:1rem;font-weight:600}.xp-promo{color:var(--accent-2);margin-top:10px;font-size:.95rem;font-weight:700;display:none}.xp-bar{background:var(--border);border-radius:2px;height:4px;margin-top:20px;overflow:hidden}.xp-progress{background:var(--accent);width:0%;height:100%;transition:width 1.4s}.quiz-q{border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);padding:18px}.quiz-q+.quiz-q{margin-top:14px}.choice{border:1px solid var(--border);cursor:pointer;border-radius:8px;align-items:flex-start;gap:10px;margin-top:8px;padding:9px 11px;display:flex}.choice:hover{border-color:var(--accent-2)}.choice input{accent-color:var(--accent);margin-top:3px}.choice.correct{border-color:var(--success);background:color-mix(in srgb, var(--success) 10%, transparent)}.choice.wrong{border-color:var(--danger);background:color-mix(in srgb, var(--danger) 10%, transparent)}.wb-layout{grid-template-columns:1fr 340px;align-items:start;gap:24px;display:grid}.wb-editor{border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);grid-template-columns:56px 1fr;gap:0;display:grid;overflow:hidden}.wb-gutter{background:var(--surface-2);border-right:1px solid var(--border);color:var(--muted);text-align:center;padding:14px 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