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1fr;background:var(--bg-primary);width:100%;height:100dvh;display:grid;overflow:hidden}.app-shell-grid.is-mobile,.app-shell-grid.no-sidebar{grid-template-columns:minmax(0,1fr)}.app-shell-grid.has-floating-topbar{grid-template-rows:0 1fr}.app-shell-grid.has-floating-topbar>.app-shell-sidebar,.app-shell-grid.has-floating-topbar>.app-shell-content{grid-row:2}.app-topbar{--tb-ground:var(--sheet);--tb-ink:var(--bill-night);--tb-ink-2:var(--text-secondary);--tb-rule:var(--border);align-items:center;gap:var(--space-lg);padding:0 var(--space-md);background:var(--tb-ground);color:var(--tb-ink);border-bottom:1px solid var(--tb-rule);z-index:100;height:var(--topbar-h);grid-area:1/1/auto/-1;transition:background .22s,color .22s,border-color .22s;display:flex}@media (prefers-reduced-motion:reduce){.app-topbar{transition:none}}@media (width>=768px){.app-topbar{padding:0 var(--space-xl)}}.app-topbar--floating{background:var(--glass-bg);-webkit-backdrop-filter:blur(12px);opacity:1;transition:transform .42s var(--ease-out-expo), opacity .28s ease;will-change:transform;position:fixed;top:0;left:0;right:0;transform:translateY(0)}.app-topbar--floating.is-hidden{opacity:0;pointer-events:none;transform:translateY(-100%)}@media (prefers-reduced-motion:reduce){.app-topbar--floating{transition:opacity .2s}.app-topbar--floating.is-hidden{visibility:hidden;transform:none}}.app-topbar-brand{align-items:center;gap:var(--space-sm);min-width:0;height:100%;display:flex}.app-topbar-hamburger{width:44px;height:44px;color:var(--tb-ink);cursor:pointer;background:0 0;border:none;flex-shrink:0;justify-content:center;align-items:center;margin-left:-10px;display:flex}@media (width>=768px){.app-topbar-hamburger{display:none}}.app-topbar-brand-logo{--brand-lead:1.75rem;--brand-ratio:.72;min-width:0;color:inherit;cursor:pointer;text-align:left;white-space:nowrap;background:0 0;border:none;align-items:baseline;gap:14px;text-decoration:none;display:flex}.app-topbar-brand-product{font-family:var(--font-bill);font-size:var(--brand-lead);letter-spacing:var(--bill-tracking);text-transform:uppercase;color:var(--tb-ink);font-weight:800;line-height:1}.app-topbar-brand-name{font-family:var(--font-bill);font-size:calc(var(--brand-lead) * var(--brand-ratio));letter-spacing:.02em;text-transform:uppercase;color:var(--tb-ink-2);font-weight:600;line-height:1}@media (width<=1023px){.app-topbar-brand-name{display:none}}.app-topbar-nav{justify-content:space-between;align-items:center;gap:var(--space-md);flex:1;min-width:0;height:100%;display:flex}.app-topbar-tabs{align-items:center;gap:2px;display:none}@media (width>=768px){.app-topbar-tabs{display:flex}}.app-topbar-tab{color:var(--tb-ink);font-family:var(--font-bill);letter-spacing:.02em;text-transform:uppercase;white-space:nowrap;cursor:pointer;background:0 0;border:none;border-radius:4px;padding:6px 14px 5px;font-size:1.1875rem;font-weight:700;line-height:1;text-decoration:none;transition:background .15s,color .15s}.app-topbar-tab:hover{background:var(--accent-dim);color:var(--accent)}.app-topbar-tab.is-active{background:var(--tb-ink);color:var(--tb-ground)}.app-topbar-tab:active{transform:translateY(1px)}.app-topbar-actions{align-items:center;gap:var(--space-md);flex-shrink:0;display:flex}.app-topbar-due{cursor:pointer;border:1.5px solid var(--tb-ink);color:var(--tb-ink);font-family:var(--font-bill);letter-spacing:.02em;text-transform:uppercase;font-variant-numeric:tabular-nums;white-space:nowrap;background:0 0;border-radius:4px;align-items:baseline;gap:6px;padding:5px 12px 4px;font-size:1.0625rem;font-weight:700;line-height:1;text-decoration:none;transition:background .15s,color .15s;display:inline-flex}.app-topbar-due:hover{background:var(--tb-ink);color:var(--tb-ground)}.app-topbar-due b{font-size:1.25rem;font-weight:800}.app-topbar-theme{width:40px;height:40px;color:var(--tb-ink);cursor:pointer;background:0 0;border:none;border-radius:4px;justify-content:center;align-items:center;padding:0;transition:background .15s,color .15s;display:inline-flex}.app-topbar-theme:hover{background:var(--tb-ink);color:var(--tb-ground)}.app-topbar-theme:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.app-topbar-sign-in{border:1.5px solid var(--tb-ink);background:var(--tb-ink);color:var(--tb-ground);font-family:var(--font-bill);letter-spacing:.02em;text-transform:uppercase;cursor:pointer;border-radius:4px;padding:7px 16px 6px;font-size:1.0625rem;font-weight:700;line-height:1;transition:background .15s,color .15s}.app-topbar-sign-in:hover{color:var(--tb-ink);background:0 0}@media (width<=767px){.app-topbar{gap:var(--space-sm)}.app-topbar-brand-logo{--brand-lead:1.5rem}.app-topbar-nav{justify-content:flex-end}.app-topbar-actions{gap:var(--space-sm)}}@media 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var(--space-md);border-radius:var(--card-radius);color:var(--text-secondary);font-size:.9rem;text-decoration:none;transition:background .2s,color 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0;border:none;border-radius:4px;place-content:center;display:grid}.mobile-sidebar-close:hover{background:var(--accent-dim);color:var(--accent)}.mobile-nav{gap:var(--space-xs);padding:var(--space-md);border-bottom:1px solid var(--border);flex-direction:column;flex-shrink:0;display:flex}.mobile-nav-link{text-align:left;padding:var(--space-sm) var(--space-md);color:var(--bill-night);font-family:var(--font-bill);letter-spacing:.02em;text-transform:uppercase;cursor:pointer;background:0 0;border-radius:4px;align-items:center;font-size:1.375rem;font-weight:700;text-decoration:none;transition:background .15s,color .15s;display:flex}.mobile-nav-link:hover{background:var(--accent-dim);color:var(--accent)}.mobile-nav-link.is-active{background:var(--bill-night);color:var(--sheet)}.mobile-nav-link{min-height:44px}.mobile-nav--account 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var(--accent)}.soft-panel{background:var(--surface-soft);border:1px solid var(--border);border-radius:var(--card-radius)}.value-card{background:var(--surface-soft);border:1px solid var(--border);border-radius:var(--card-radius);padding:var(--space-md)}.value-label{font-family:var(--font-mono);font-size:var(--text-2xs);letter-spacing:var(--tracking-eyebrow);text-transform:uppercase;color:var(--accent);margin-bottom:8px;font-weight:600;display:block}.badge{letter-spacing:.08em;text-transform:uppercase;background:var(--surface-muted);color:var(--text-muted);border:1px solid var(--border);border-radius:4px;align-items:center;padding:3px 8px;font-size:10px;font-weight:700;display:inline-flex}@media 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(width>=1024px){.app-shell-content-scroll:has(.lesson-layout[data-has-rail=true]){overflow:hidden}}.open-questions-list{gap:var(--space-md);flex-direction:column;list-style:none;display:flex}.open-question-item{gap:var(--space-md);color:var(--text-secondary);line-height:var(--leading-read);align-items:flex-start;display:flex}.open-question-index{font-size:var(--text-2xs);font-family:var(--font-mono);font-variant-numeric:tabular-nums;color:var(--_section-color,var(--section-research));flex-shrink:0;margin-top:6px;font-weight:600}.pillar-title{color:var(--text-primary);font-size:1.25rem;font-weight:700}.cta-title{color:var(--text-primary);margin-bottom:var(--space-lg);font-size:clamp(1.5rem,3vw,1.875rem);font-weight:700}.btn-primary,.btn-cta,.btn-secondary,.btn-quiet,.btn-danger{justify-content:center;align-items:center;gap:var(--space-sm);min-height:40px;font-family:var(--font-sans);font-size:var(--text-sm);white-space:nowrap;cursor:pointer;border:1.5px solid 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0}.btn-danger:hover{background:var(--danger-soft);border-color:var(--danger)}.btn-primary:active,.btn-cta:active,.btn-secondary:active,.btn-quiet:active,.btn-danger:active{transform:translateY(1px)}.btn-primary:disabled,.btn-cta:disabled,.btn-secondary:disabled,.btn-quiet:disabled,.btn-danger:disabled,.btn-primary[aria-disabled=true],.btn-cta[aria-disabled=true],.btn-secondary[aria-disabled=true]{opacity:.5;cursor:not-allowed;transform:none}.btn-sm{min-height:32px;font-size:var(--text-xs);padding:5px 12px}.btn-lg{min-height:48px;font-size:var(--text-base);padding:12px 22px}.route-fallback{max-width:48rem;padding:var(--space-xl) 0}.error-fallback{max-width:36rem;padding:0 var(--space-lg);color:var(--text-primary);margin:15vh auto 0}.error-fallback h1{font-family:var(--font-bill);font-size:var(--bill-3);text-transform:uppercase;margin-bottom:var(--space-md);font-weight:800;line-height:1}.error-fallback p{color:var(--text-secondary);line-height:var(--leading-body);margin-bottom:var(--space-lg)}.error-fallback-actions{gap:var(--space-sm);flex-wrap:wrap;display:flex}.status-message{align-items:center;gap:var(--space-sm) var(--space-md);padding:var(--space-md) 0;border-top:1px solid var(--rule);border-bottom:1px solid var(--rule);color:var(--text-secondary);font-size:var(--text-sm);line-height:var(--leading-body);flex-wrap:wrap;display:flex}.status-message p{max-width:60ch;margin:0}.status-message-title{color:var(--text-primary);font-weight:600;display:block}.status-message.is-error{color:var(--danger);border-color:var(--danger-border)}.status-message.is-error .status-message-title{color:var(--danger)}.status-message-icon{flex-shrink:0}::selection{background:var(--selection)}input,textarea,[contenteditable]{caret-color:var(--accent)}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--scrollbar-thumb);border-radius:10px;transition:background .16s}::-webkit-scrollbar-thumb:hover{background:var(--scrollbar-thumb)}@supports (color:color-mix(in lab, red, red)){::-webkit-scrollbar-thumb:hover{background:color-mix(in srgb, var(--scrollbar-thumb) 65%, var(--text-primary))}}@keyframes shimmer{0%{background-position:-400px 0}to{background-position:400px 0}}.skeleton-line{background:linear-gradient(90deg, var(--surface-soft) 25%, var(--surface-muted) 50%, var(--surface-soft) 75%);background-size:800px 100%;border-radius:6px;animation:1.5s ease-in-out infinite 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