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p{max-width:52ch;margin-top:10px}.ws-band{background:var(--bg-canvas);border-block:1px solid var(--border-subtle)}.ws-stair{position:relative}.ws-stair__row{align-items:flex-end;gap:12px;padding-top:64px;display:flex}.ws-stair__tile{--tile:var(--tile-l);--i:0;min-width:0;height:calc(120px + var(--i) * 16px);border-radius:var(--r-lg);color:#1c1b19;isolation:isolate;transition:transform var(--spring-press-duration) var(--spring-press);flex:1 1 0;position:relative}:where([data-theme=dark],[data-theme=night]) .ws-stair__tile{color:#e6e4df}.ws-stair__face{z-index:1;border-radius:inherit;background:linear-gradient(180deg, #ffffff38, transparent 40%), var(--tile);box-shadow:inset 0 1px 0 #ffffff59, 0 1px 2px rgb(var(--sh-rgb) / .08);transition:box-shadow var(--d-base) var(--ease-standard);flex-direction:column;justify-content:space-between;padding:14px 14px 12px;display:flex;position:absolute;inset:0}:where([data-theme=dark],[data-theme=night]) 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var(--spring-gentle);font-size:11px;position:absolute;bottom:0;left:0;translate:-50% 20px;rotate:none}@media (hover:hover) and (pointer:fine){.ws-stair__tile:hover,.ws-stair__tile:focus-visible{transform:translateY(-8px)}.ws-stair__tile:hover .ws-stair__face,.ws-stair__tile:focus-visible .ws-stair__face{box-shadow:inset 0 1px 0 #ffffff59, 0 14px 30px -12px rgb(var(--sh-rgb) / .35)}.ws-stair__tile:hover .ws-mini,.ws-stair__tile:focus-visible .ws-mini{opacity:1;translate:calc(-50% + var(--fx)) -8px;rotate:var(--fr);transition-delay:calc(var(--k) * 30ms)}}.ws-stages{grid-template-columns:repeat(12,1fr);gap:12px;margin-top:16px;display:grid}.ws-stage{color:var(--ink-3);padding-top:12px;font-size:12px;line-height:1.35;position:relative}.ws-stage:before{content:"";border:1px solid var(--border-strong);border-bottom:0;border-radius:4px 4px 0 0;height:6px;position:absolute;inset:0 2px auto}.ws-stage b{color:var(--ink-1);font-weight:600;display:block}.ws-grid-tiles{display:none}@media (max-width:767px){.ws-stair__row,.ws-stages{display:none}.ws-grid-tiles{gap:20px;display:grid}.ws-grid-tiles__group{grid-template-columns:repeat(3,1fr);gap:10px;display:grid}.ws-grid-tiles__label{grid-column:1/-1;align-items:baseline;gap:8px;display:flex}}.ws-tile{--tile:var(--tile-l);aspect-ratio:1;border-radius:var(--r-xl);background:linear-gradient(180deg, #fff3, transparent 45%), var(--tile);color:#1c1b19;transition:transform var(--spring-press-duration) var(--spring-press);flex-direction:column;justify-content:space-between;padding:12px;display:flex;position:relative}:where([data-theme=dark],[data-theme=night]) .ws-tile{color:#e6e4df;background:linear-gradient(180deg, #ffffff0d, transparent 45%), var(--tile)}.ws-tile:active{transform:scale(.97)}.ws-tile[data-mine]{box-shadow:0 0 0 2px var(--bg-page), 0 0 0 4px var(--ink-1)}.ws-tile__num{letter-spacing:-.05em;font-size:44px;font-weight:650;line-height:.9}.ws-tile__meta{opacity:.72;font-size:11px;font-weight:600}.ws-continue{scroll-snap-type:x mandatory;scrollbar-width:none;grid-auto-columns:minmax(300px,340px);grid-auto-flow:column;gap:16px;margin:-4px -4px 0;padding:4px 4px 16px;display:grid;overflow-x:auto}.ws-continue::-webkit-scrollbar{display:none}.ws-ccard{scroll-snap-align:start;border-radius:var(--r-lg);background:var(--bg-surface);min-height:136px;box-shadow:var(--e1);transition:box-shadow var(--d-base) var(--ease-standard), transform var(--spring-gentle-duration) var(--spring-gentle);gap:16px;padding:16px;display:flex}.ws-ccard:hover{box-shadow:var(--e2);transform:translateY(-2px)}.ws-ccard 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var(--spring-gentle);grid-template-columns:108px 1fr;gap:18px;padding:18px;display:grid;position:relative}.ws-feature:hover{box-shadow:var(--e3);transform:translateY(-3px)}.ws-feature__eyebrow{letter-spacing:.08em;text-transform:uppercase;color:var(--subj-ink);font-size:11px;font-weight:650}.ws-feature__title{font-family:var(--font-reading);letter-spacing:-.015em;margin-top:6px;font-size:21px;font-weight:560;line-height:1.2}.ws-feature__dek{color:var(--ink-2);-webkit-line-clamp:2;-webkit-box-orient:vertical;margin-top:6px;font-size:13.5px;line-height:1.45;display:-webkit-box;overflow:hidden}.ws-stats{color:var(--ink-3);flex-wrap:wrap;gap:6px 12px;margin-top:12px;font-size:12px;display:flex}.ws-stats span{align-items:center;gap:5px;display:inline-flex}.ws-stats svg{stroke-width:1.9px;width:14px;height:14px}.ws-how{grid-template-columns:repeat(3,1fr);gap:20px;display:grid}@media (max-width:900px){.ws-how{grid-template-columns:1fr}}.ws-howcard{border-radius:var(--r-2xl);background:var(--bg-surface);box-shadow:var(--e1);flex-direction:column;display:flex;overflow:hidden}.ws-howcard__demo{aspect-ratio:16/10;background:var(--bg-canvas);border-radius:20px;margin:8px 8px 0;position:relative;overflow:hidden}.ws-howcard__body{padding:18px 22px 22px}.ws-howcard__step{background:var(--ink-1);width:24px;height:24px;color:var(--bg-page);vertical-align:2px;border-radius:50%;place-items:center;margin-right:8px;font-size:12px;font-weight:650;display:inline-grid}.ws-howcard p{color:var(--ink-2);margin-top:8px;font-size:14px;line-height:1.55}.ws-mread{font:400 15px/1.7 var(--font-reading);color:var(--ink-1);padding:26px 26px 0;position:absolute;inset:0}.ws-mread p{max-width:34ch}.ws-mread mark{color:inherit;background:0 0;position:relative}.ws-mread mark:before{content:"";z-index:-1;background:var(--hl-yellow);transform-origin:0;animation:ws-sweep 5s var(--ease-standard) infinite;border-radius:3px;position:absolute;inset:.08em -.06em .02em}.ws-mread mark{z-index:0}@keyframes ws-sweep{0%,8%{transform:scaleX(0)}26%,86%{transform:scaleX(1)}96%,to{opacity:0;transform:scaleX(0)}}.ws-mread__pop{border-radius:var(--r-full);background:var(--glass-thick-bg);height:36px;-webkit-backdrop-filter:var(--glass-thick-filter);backdrop-filter:var(--glass-thick-filter);box-shadow:var(--e3);animation:ws-popin 5s var(--ease-snappy) infinite;align-items:center;gap:5px;padding:4px 4px 4px 8px;display:flex;position:absolute;top:62%;left:26px}.ws-mread__pop i{border-radius:50%;width:16px;height:16px}.ws-mread__pop b{border-radius:var(--r-full);background:var(--brand);height:28px;color:var(--brand-on);font:600 12px/1 var(--font-ui);align-items:center;gap:4px;margin-left:4px;padding-inline:10px;display:inline-flex}@keyframes ws-popin{0%,24%{opacity:0;transform:translateY(6px)scale(.94)}32%,84%{opacity:1;transform:none}92%,to{opacity:0}}.ws-mplay{position:absolute;inset:0}.ws-mplay svg{width:100%;height:100%}.ws-mplay .fl{fill:none;stroke:var(--fig-muted);stroke-width:1.5px;stroke-dasharray:4 7;animation:1.6s linear infinite ws-flow}@keyframes ws-flow{to{stroke-dashoffset:-22px}}.ws-mplay .needle{transform-box:fill-box;transform-origin:50%;animation:ws-needle 4s var(--ease-inout) infinite alternate}@keyframes ws-needle{0%{transform:rotate(-35deg)}to{transform:rotate(35deg)}}.ws-mask{align-content:center;gap:8px;padding:18px 22px;display:grid;position:absolute;inset:0}.ws-mask__q{font:600 13px/1.4 var(--font-ui)}.ws-mask__opt{border:1px solid var(--border);background:var(--bg-surface);height:32px;color:var(--ink-2);border-radius:10px;align-items:center;gap:8px;padding-inline:10px;font-size:13px;display:flex}.ws-mask__opt[data-ok]{animation:ws-ok 5s var(--ease-standard) infinite}.ws-mask__opt i{border:1.5px solid var(--border-strong);border-radius:50%;width:14px;height:14px}@keyframes ws-ok{0%,30%{border-color:var(--border);background:var(--bg-surface);color:var(--ink-2)}38%,92%{border-color:color-mix(in oklab, var(--success) 55%, transparent);background:var(--success-soft);color:var(--ink-1)}}.ws-mask__ai{background:var(--brand-soft);max-width:80%;color:var(--ink-1);animation:ws-bubble 5s var(--ease-enter) infinite;border-radius:14px 14px 4px;justify-self:end;padding:8px 12px;font-size:12.5px;line-height:1.4}@keyframes ws-bubble{0%,45%{opacity:0;transform:translateY(6px)}55%,92%{opacity:1;transform:none}to{opacity:0}}:root[data-motion=off] :is(.ws-mread__pop,.ws-mplay .fl,.ws-mplay .needle,.ws-mask__opt,.ws-mask__ai),:root[data-motion=reduced] :is(.ws-mplay .fl,.ws-mplay .needle){animation:none}:root[data-motion=off] .ws-mread mark:before{animation:none;transform:none}@media (prefers-reduced-motion:reduce){:root:not([data-motion=full]) :is(.ws-mread__pop,.ws-mplay .fl,.ws-mplay .needle,.ws-mask__opt,.ws-mask__ai){animation:none}}.ws-subjects{flex-wrap:wrap;gap:8px;display:flex}.ws-trust{grid-template-columns:repeat(3,1fr);gap:20px;display:grid}@media (max-width:900px){.ws-trust{grid-template-columns:1fr}}.ws-trust__item{border-radius:var(--r-lg);border:1px solid var(--border-subtle);background:var(--bg-page);gap:14px;padding:20px;display:flex}.ws-trust__icon{background:var(--brand-soft);width:40px;height:40px;color:var(--brand);border-radius:12px;flex:none;place-items:center;display:grid}.ws-trust__icon svg{width:20px;height:20px}.ws-trust__item h3{font-size:15px;font-weight:600}.ws-trust__item p{color:var(--ink-2);margin-top:4px;font-size:14px;line-height:1.5}.ws-classband{--tile:var(--tile-l);margin-top:calc(-1 * var(--ws-nav-h));padding-top:calc(var(--ws-nav-h) + 48px);background:linear-gradient(180deg, var(--tile) 0%, var(--bg-page) 100%);padding-bottom:36px;position:relative}@supports (color:color-mix(in lab, red, red)){.ws-classband{background:linear-gradient(180deg, color-mix(in oklab, var(--tile) 42%, var(--bg-canvas)) 0%, var(--bg-page) 100%)}}.ws-classband__title{letter-spacing:-.035em;align-items:baseline;gap:.18em;margin-top:10px;font-size:clamp(2.5rem,1.6rem + 3vw,3.75rem);font-weight:650;line-height:1;display:flex}.ws-classband__title em{font-family:var(--font-reading);font-variation-settings:"opsz" 72;letter-spacing:-.03em;font-size:1.4em;font-style:italic;font-weight:400}[data-stage=junior] .ws-classband__title{font-family:var(--font-junior-display);letter-spacing:-.02em}.ws-classband__meta{color:var(--ink-2);margin-top:14px;font-size:15px}.ws-classband__bar{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;margin-top:28px;display:flex}.ws-classnav{flex-wrap:wrap;gap:4px;display:flex}.ws-classnav a{width:30px;height:30px;color:var(--ink-2);font-variant-numeric:tabular-nums;border-radius:9px;place-items:center;font-size:13px;font-weight:600;display:inline-grid}.ws-classnav a:hover{background:var(--bg-surface)}@supports (color:color-mix(in lab, red, red)){.ws-classnav a:hover{background:color-mix(in oklab, var(--bg-surface) 70%, transparent)}}.ws-classnav a:hover{color:var(--ink-1)}.ws-classnav a[aria-current=page]{background:var(--ink-1);color:var(--bg-page)}.ws-filterbar{top:var(--ws-nav-h);z-index:calc(var(--z-header) - 1);transition:background-color var(--d-base) var(--ease-standard), box-shadow var(--d-base) var(--ease-standard);padding-block:10px;position:sticky}.ws-filterbar[data-stuck]{background:var(--glass-chrome-bg);-webkit-backdrop-filter:var(--glass-chrome-filter);backdrop-filter:var(--glass-chrome-filter);box-shadow:0 .5px 0 var(--border)}@supports (color:color-mix(in lab, red, red)){.ws-filterbar[data-stuck]{box-shadow:0 .5px 0 color-mix(in oklab, var(--border) 90%, transparent)}}.ws-filterbar__row{scrollbar-width:none;gap:8px;min-width:0;display:flex;overflow-x:auto}.ws-filterbar__row::-webkit-scrollbar{display:none}.ws-shelf{padding-top:40px}.ws-shelf__head{border-bottom:1px solid var(--border-subtle);align-items:center;gap:8px;margin-bottom:16px;padding-bottom:12px;display:flex}.ws-shelf__dot{background:var(--subj-solid);border-radius:50%;width:10px;height:10px}.ws-shelf__count{color:var(--ink-3);font-size:12px;font-weight:600}.ws-shelf__dot{width:8px!important;height:8px!important}.ws-books{grid-template-columns:repeat(auto-fill,minmax(168px,1fr));gap:32px 24px;display:grid}.ws-book{perspective:900px;flex-direction:column;gap:12px;display:flex}.ws-book__title{letter-spacing:-.01em;-webkit-line-clamp:2;-webkit-box-orient:vertical;font-size:15px;font-weight:600;line-height:1.3;display:-webkit-box;overflow:hidden}.ws-book__sub{color:var(--ink-3);margin-top:2px;font-size:12px}.ws-book__foot{align-items:center;gap:8px;min-height:22px;margin-top:8px;display:flex}@media (max-width:767px){.ws-books{scroll-snap-type:x mandatory;margin-inline:calc(-1 * var(--ws-gutter));padding-inline:var(--ws-gutter);scroll-padding-inline:var(--ws-gutter);scrollbar-width:none;grid-template-columns:none;grid-auto-columns:132px;grid-auto-flow:column;gap:16px;padding-bottom:8px;display:grid;overflow-x:auto}.ws-books::-webkit-scrollbar{display:none}.ws-book{scroll-snap-align:start}.ws-book__title{font-size:14px}}.ws-empty{border-radius:var(--r-2xl);border:1px dashed var(--border-strong);text-align:center;color:var(--ink-2);justify-items:center;gap:12px;padding:56px 24px;display:grid}.ws-empty svg.ws-empty__art{width:160px;height:auto;color:var(--ink-3)}.ws-empty h2,.ws-empty h3{color:var(--ink-1);font-size:18px;font-weight:600}.ws-empty p{max-width:44ch;font-size:14px;line-height:1.55}.ws-bookhero{padding-block:56px 40px;position:relative;overflow:clip}.ws-bookhero:before{content:"";z-index:-1;background:radial-gradient(60% 80% at 20% 0%, var(--subj-soft), transparent 70%);position:absolute;inset:0}@supports (color:color-mix(in lab, red, red)){.ws-bookhero:before{background:radial-gradient(60% 80% at 20% 0%, color-mix(in oklab, var(--subj-soft) 90%, transparent), transparent 70%)}}.ws-bookhero__grid{grid-template-columns:280px 1fr;align-items:center;gap:56px;max-width:1120px;display:grid}.ws-bookhero__cover{width:280px}.ws-bookhero__cover .ws-cover{box-shadow:var(--e-cover), 0 40px 60px -30px rgb(var(--sh-rgb) / .45)}.ws-bookhero__eyebrow{letter-spacing:.09em;text-transform:uppercase;color:var(--subj-ink);font-size:12px;font-weight:650}.ws-bookhero h1{letter-spacing:-.035em;margin-top:10px;font-size:clamp(2.25rem,1.6rem + 2.2vw,3.5rem);font-weight:650;line-height:1.02}.ws-bookhero__sub{font-family:var(--font-reading);color:var(--ink-2);margin-top:8px;font-size:20px;font-style:italic;line-height:1.4}.ws-bookhero__desc{max-width:58ch;color:var(--ink-2);margin-top:16px;font-size:15px;line-height:1.6}.ws-metarow{color:var(--ink-2);font-variant-numeric:tabular-nums;flex-wrap:wrap;gap:4px 0;margin-top:18px;font-size:14px;display:flex}.ws-metarow span+span:before{content:"·";color:var(--ink-3);margin-inline:8px}.ws-provenance{color:var(--ink-3);align-items:flex-start;gap:8px;margin-top:14px;font-size:13px;line-height:18px;display:flex}.ws-provenance svg{flex:none;width:15px;height:15px;margin-top:2px}.ws-provenance a{color:var(--brand);text-decoration:underline;-webkit-text-decoration-color:var(--brand);-webkit-text-decoration-color:var(--brand);-webkit-text-decoration-color:var(--brand);text-decoration-color:var(--brand)}@supports (color:color-mix(in lab, red, red)){.ws-provenance a{-webkit-text-decoration-color:color-mix(in oklab, var(--brand) 35%, transparent);-webkit-text-decoration-color:color-mix(in oklab, var(--brand) 35%, transparent);-webkit-text-decoration-color:color-mix(in oklab, var(--brand) 35%, transparent);text-decoration-color:color-mix(in oklab, var(--brand) 35%, transparent)}}.ws-provenance a{text-underline-offset:3px}.ws-bookhero__actions{flex-wrap:wrap;align-items:center;gap:12px 16px;margin-top:28px;display:flex}.ws-ring{color:var(--ink-2);align-items:center;gap:10px;font-size:13px;display:inline-flex}.ws-ring svg{width:40px;height:40px;rotate:-90deg}.ws-ring circle{fill:none;stroke-width:3px}.ws-ring .t{stroke:var(--bg-muted)}.ws-ring .v{stroke:var(--subj-solid);stroke-linecap:round;transition:stroke-dashoffset var(--d-deliberate) var(--ease-enter)}@media (max-width:767px){.ws-bookhero{text-align:center;padding-top:28px}.ws-bookhero__grid{grid-template-columns:1fr;justify-items:center;gap:28px}.ws-bookhero__cover{width:180px;position:relative}.ws-bookhero__blur{z-index:-1;filter:blur(40px)saturate(1.4);opacity:.3;pointer-events:none;position:absolute;inset:-30% -60%}.ws-metarow,.ws-bookhero__actions,.ws-provenance{justify-content:center}.ws-provenance{text-align:left}.ws-bookhero__desc{margin-inline:auto}}@media (min-width:768px){.ws-bookhero__blur{display:none}}.ws-tabs{top:var(--ws-nav-h);z-index:calc(var(--z-header) - 1);border-bottom:1px solid var(--border);background:var(--glass-chrome-bg);-webkit-backdrop-filter:var(--glass-chrome-filter);backdrop-filter:var(--glass-chrome-filter);position:sticky}.ws-tabs__row{scrollbar-width:none;gap:24px;display:flex;overflow-x:auto}.ws-tabs__row::-webkit-scrollbar{display:none}.ws-tab{height:48px;color:var(--ink-3);white-space:nowrap;transition:color var(--d-fast) var(--ease-standard);align-items:center;gap:6px;font-size:14px;font-weight:500;display:inline-flex;position:relative}.ws-tab:hover,.ws-tab[aria-selected=true]{color:var(--ink-1)}.ws-tab[aria-selected=true]:after{content:"";background:var(--ink-1);border-radius:2px;height:2px;position:absolute;bottom:-1px;left:0;right:0}.ws-tab__n{background:var(--bg-subtle);min-width:20px;color:var(--ink-3);text-align:center;border-radius:99px;padding:1px 6px;font-size:11px;font-weight:600}.ws-chapters{max-width:880px;padding-top:8px}.ws-chrow{border-radius:var(--r-md);min-height:72px;transition:background-color var(--d-fast) 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