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lab,red,red)){.hero-letter:hover{background:color-mix(in oklab,var(--surface-raised) 92%,var(--letter-accent) 3%)}}}.badge{border-radius:var(--radius-full);border:1px solid var(--line);background:var(--surface-raised);color:var(--text-dim);font-size:var(--text-xs);letter-spacing:.06em;text-transform:uppercase;white-space:nowrap;align-items:center;padding:.15rem .6rem;display:inline-flex}.badge.badge-accent{color:var(--accent-3);border-color:var(--accent-3)}@supports (color:color-mix(in lab,red,red)){.badge.badge-accent{border-color:color-mix(in oklab,var(--accent-3) 40%,transparent)}}.list-panel,.panel{background:var(--surface);border:1px solid var(--line-strong);border-radius:var(--radius-lg)}.list-panel{margin:0;padding:0;list-style:none;overflow:hidden}.list-row{align-items:center;gap:var(--space-3);width:100%;padding:var(--space-3) var(--space-4);color:var(--text);transition:background-color var(--motion-fast) var(--ease-out);text-decoration:none;display:flex}.list-panel>.list-row+.list-row,.list-panel>li+li>.list-row{border-top:1px solid var(--line)}a.list-row:hover,button.list-row:hover{background:var(--surface-raised)}@media (pointer:coarse){.list-row{min-height:var(--control-lg)}}.callout{gap:var(--space-2);padding:var(--space-3) var(--space-4);border-left:3px solid var(--callout-tone,var(--line-strong));background:var(--callout-tone,var(--text-dim));flex-direction:column;display:flex}@supports (color:color-mix(in lab,red,red)){.callout{background:color-mix(in oklab,var(--callout-tone,var(--text-dim)) 6%,transparent)}}.callout{color:var(--text)}.callout-label{font-size:var(--text-2xs);font-weight:var(--weight-semibold);letter-spacing:var(--tracking-label);text-transform:uppercase;color:var(--callout-tone,var(--text-dim))}.resume-hero{gap:var(--space-4);padding:var(--space-6);border:1px solid var(--accent-1);flex-direction:column;display:flex}@supports (color:color-mix(in lab,red,red)){.resume-hero{border:1px solid color-mix(in oklab,var(--accent-1) 38%,var(--line-strong))}}.resume-hero{border-radius:var(--radius-lg);background:var(--surface-raised)}@media (min-width:641px){.resume-hero{padding:var(--space-8)}}.lesson-toolbar{justify-content:space-between;align-items:center;gap:var(--space-4);padding-bottom:var(--space-3);border-bottom:1px solid var(--line);flex-wrap:wrap;display:flex}.mode-toggle{gap:var(--space-1);padding:var(--space-1);border:1px solid var(--line);border-radius:var(--radius-md);background:var(--surface);display:inline-flex}.mode-toggle-btn{height:var(--control-sm);padding:0 var(--space-4);border-radius:var(--radius-sm);font-size:var(--text-sm);font-weight:var(--weight-medium);color:var(--text-dim);cursor:pointer;transition:background-color var(--motion-fast) var(--ease-out),color var(--motion-fast) var(--ease-out);background:0 0}.mode-toggle-btn:hover:not(:disabled){color:var(--text)}.mode-toggle-btn[aria-pressed=true]{background:var(--surface-raised);color:var(--text);box-shadow:inset 0 0 0 1px var(--line-strong)}.mode-toggle-btn:disabled{opacity:.4;cursor:not-allowed}@media (pointer:coarse){.mode-toggle-btn{height:var(--control-md)}}.problem-card{gap:var(--space-4);padding:var(--space-6);border:1px solid var(--line-strong);border-radius:var(--radius-lg);background:var(--surface);transition:border-color var(--motion-med) var(--ease-out);flex-direction:column;display:flex}.problem-card[data-correct]{border-color:var(--success)}@supports (color:color-mix(in lab,red,red)){.problem-card[data-correct]{border-color:color-mix(in oklab,var(--success) 55%,var(--line-strong))}}.option-row{align-items:flex-start;gap:var(--space-3);min-height:var(--control-lg);padding:var(--space-3);border:1px solid var(--line);border-radius:var(--radius-md);cursor:pointer;transition:background-color var(--motion-fast) var(--ease-out),border-color var(--motion-fast) var(--ease-out);display:flex}.option-row:hover{background:var(--surface-raised)}.option-row[data-selected]{border-color:var(--accent-1)}@supports (color:color-mix(in lab,red,red)){.option-row[data-selected]{border-color:color-mix(in oklab,var(--accent-1) 55%,var(--line))}}.option-row[data-selected]{background:var(--surface-raised)}.option-row:has(input:disabled){cursor:default}.option-radio{width:1.15rem;height:1.15rem;accent-color:var(--accent-1);flex:none;margin-top:.1rem}.callout[data-hint]{--callout-tone:var(--accent-3)}.section-head{justify-content:space-between;align-items:baseline;gap:var(--space-4);flex-wrap:wrap;display:flex}.data-table{border-collapse:collapse;width:100%;font-size:var(--text-sm)}.data-table caption{padding-bottom:var(--space-3);font-size:var(--text-xs)}.data-table caption,.data-table th{color:var(--text-dim);text-align:left}.data-table th{padding:var(--space-2) var(--space-4);border-bottom:1px solid var(--line-strong);font-size:var(--text-2xs);font-weight:var(--weight-semibold);letter-spacing:var(--tracking-label);text-transform:uppercase;white-space:nowrap}.data-table td{padding:var(--space-3) var(--space-4);border-bottom:1px solid var(--line);vertical-align:baseline}.data-table tbody tr:last-child td{border-bottom:0}.data-table .num{text-align:right;font-variant-numeric:tabular-nums}.table-scroll{overflow-x:auto}.settings-row{justify-content:space-between;align-items:center;gap:var(--space-4);padding:var(--space-4);flex-wrap:wrap;display:flex}.settings-row+.settings-row{border-top:1px solid var(--line)}.settings-row-copy{gap:var(--space-1);flex-direction:column;flex:16rem;min-width:0;display:flex}.lesson-nav{justify-content:space-between;align-items:stretch;gap:var(--space-4);margin-top:var(--space-8);padding-top:var(--space-6);border-top:1px solid var(--line-strong);display:flex}.lesson-nav-link{gap:var(--space-1);max-width:22rem;color:var(--text);flex-direction:column;text-decoration:none;display:flex}.lesson-nav-link:hover .lesson-nav-title{color:var(--accent-3)}.lesson-nav-next{text-align:right;align-items:flex-end;margin-left:auto}.lesson-nav-title{transition:color var(--motion-fast) var(--ease-out)}.lesson-nav-title,.skip-link{font-size:var(--text-sm);font-weight:var(--weight-medium)}.skip-link{left:var(--space-2);top:var(--space-2);z-index:var(--z-toast);padding:var(--space-2) var(--space-4);border-radius:var(--radius-md);background:var(--surface-raised);border:1px solid var(--line-strong);color:var(--text);text-decoration:none;position:absolute;transform:translateY(-200%)}.skip-link:focus-visible{transform:translateY(0)}.facet-chip{border-radius:var(--radius-full);border:1px solid var(--line);color:var(--text-dim);font-size:var(--text-sm);padding:.3rem .85rem;text-decoration:none;display:inline-flex}.facet-chip.is-active{color:var(--base);background:var(--accent-3);border-color:var(--accent-3);font-weight:var(--weight-semibold)}.course-card{color:var(--text);flex-direction:column;gap:.6rem;padding:1.1rem 1.25rem;text-decoration:none;display:flex}@media (prefers-reduced-motion:no-preference){.course-card{transition:border-color .14s,transform .14s}.course-card:hover{border-color:var(--accent-2)}@supports (color:color-mix(in lab,red,red)){.course-card:hover{border-color:color-mix(in oklab,var(--accent-2) 55%,transparent)}}}.progress-track{background:var(--line);height:4px;overflow:hidden}.progress-fill,.progress-track{border-radius:var(--radius-full)}.progress-fill{background:var(--accent-1);height:100%}.accordion-section{border:1px solid var(--line);border-radius:var(--radius-md);background:var(--surface)}.accordion-section>summary{cursor:pointer;font-weight:var(--weight-semibold);justify-content:space-between;align-items:center;gap:1rem;padding:.9rem 1.2rem;list-style:none;display:flex}.accordion-section>summary::-webkit-details-marker{display:none}.accordion-section>summary:after{content:"+";color:var(--text-dim);font-weight:var(--weight-normal)}.accordion-section[open]>summary:after{content:"–"}.lesson-row{border-top:1px solid var(--line);color:var(--text-dim);font-size:var(--text-sm);align-items:center;gap:.75rem;padding:.65rem 1.2rem;display:flex}.lesson-status-dot{border-radius:var(--radius-full);border:1px solid var(--text-dim);flex-shrink:0;width:.55rem;height:.55rem}.learning-path-nav{border-bottom:1px solid var(--line);padding-bottom:1rem}.learning-path-header{padding:.35rem 0 .5rem}@media (max-width:640px){.brand-wordmark{gap:.7rem;min-height:5.2rem}.brand-logo{width:min(8.25rem,48vw)}.brand-side-tagline{display:none}.home-header{flex-direction:column;align-items:flex-start}.home-content{gap:2.5rem;padding-top:2.5rem}}@media (prefers-reduced-motion:reduce){*,:after,:before{scroll-behavior:auto!important;transition-duration:.001ms!important;animation-duration:.001ms!important;animation-iteration-count:1!important}}:root[data-reduce-motion] *,:root[data-reduce-motion] :after,:root[data-reduce-motion] :before{scroll-behavior:auto!important;transition-duration:.001ms!important;animation-duration:.001ms!important;animation-iteration-count:1!important}:root[data-saver] [data-testid=glow-layer],:root[data-saver] [data-testid=math-texture]{display:none!important}.home-ai-card{border:1px solid var(--accent-3);align-items:center;gap:1rem;padding:1.25rem 1.35rem;display:flex}@supports (color:color-mix(in lab,red,red)){.home-ai-card{border:1px solid color-mix(in oklab,var(--accent-3) 32%,var(--line))}}.home-ai-card{border-radius:var(--radius-md);background:var(--surface)}@supports (color:color-mix(in lab,red,red)){.home-ai-card{background:color-mix(in oklab,var(--surface) 90%,var(--accent-3) 5%)}}.home-ai-card{color:var(--text);text-decoration:none}.home-ai-mark{border-radius:var(--radius-md);background:var(--accent-3);flex:none;justify-content:center;align-items:center;width:3rem;height:3rem;display:inline-flex}@supports (color:color-mix(in lab,red,red)){.home-ai-mark{background:color-mix(in oklab,var(--accent-3) 16%,transparent)}}.home-ai-mark{color:var(--accent-3);font-size:var(--text-sm);font-weight:var(--weight-bold);letter-spacing:.04em}.home-ai-copy{flex-direction:column;flex:1;gap:.3rem;min-width:0;display:flex}.home-ai-copy strong{font-size:var(--text-base);font-weight:var(--weight-semibold)}.home-ai-copy span{color:var(--text-dim);font-size:var(--text-sm);line-height:1.5}.home-ai-action{color:var(--accent-3);font-size:var(--text-sm);font-weight:var(--weight-semibold);flex:none}@media (max-width:640px){.home-ai-card{flex-wrap:wrap;align-items:flex-start}.home-ai-action{width:100%}}@media (prefers-reduced-motion:no-preference){.home-ai-card{transition:border-color .16s,background-color .16s}.home-ai-card:hover{border-color:var(--accent-3)}@supports (color:color-mix(in lab,red,red)){.home-ai-card:hover{border-color:color-mix(in oklab,var(--accent-3) 62%,var(--line))}}.home-ai-card:hover{background:var(--surface-raised)}@supports (color:color-mix(in lab,red,red)){.home-ai-card:hover{background:color-mix(in oklab,var(--surface-raised) 90%,var(--accent-3) 6%)}}}@property --tw-rotate-x{syntax:"*";inherits:false}@property --tw-rotate-y{syntax:"*";inherits:false}@property --tw-rotate-z{syntax:"*";inherits:false}@property --tw-skew-x{syntax:"*";inherits:false}@property --tw-skew-y{syntax:"*";inherits:false}@property --tw-border-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-leading{syntax:"*";inherits:false}@property --tw-font-weight{syntax:"*";inherits:false}@property --tw-tracking{syntax:"*";inherits:false}@property --tw-ordinal{syntax:"*";inherits:false}@property --tw-slashed-zero{syntax:"*";inherits:false}@property --tw-numeric-figure{syntax:"*";inherits:false}@property --tw-numeric-spacing{syntax:"*";inherits:false}@property --tw-numeric-fraction{syntax:"*";inherits:false}@property --tw-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-shadow-color{syntax:"*";inherits:false}@property --tw-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-inset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-shadow-color{syntax:"*";inherits:false}@property --tw-inset-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-ring-color{syntax:"*";inherits:false}@property --tw-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-ring-color{syntax:"*";inherits:false}@property --tw-inset-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-ring-inset{syntax:"*";inherits:false}@property --tw-ring-offset-width{syntax:"<length>";inherits:false;initial-value:0}@property --tw-ring-offset-color{syntax:"*";inherits:false;initial-value:#fff}@property --tw-ring-offset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-outline-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-blur{syntax:"*";inherits:false}@property --tw-brightness{syntax:"*";inherits:false}@property --tw-contrast{syntax:"*";inherits:false}@property --tw-grayscale{syntax:"*";inherits:false}@property --tw-hue-rotate{syntax:"*";inherits:false}@property --tw-invert{syntax:"*";inherits:false}@property --tw-opacity{syntax:"*";inherits:false}@property --tw-saturate{syntax:"*";inherits:false}@property --tw-sepia{syntax:"*";inherits:false}@property --tw-drop-shadow{syntax:"*";inherits:false}@property --tw-drop-shadow-color{syntax:"*";inherits:false}@property --tw-drop-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-drop-shadow-size{syntax:"*";inherits:false}