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var(--c);border-radius:var(--ib-r);background:var(--ib-bg);text-decoration:none;transition:border-color .2s ease,transform .2s ease;}.gr-other:hover{border-color:var(--c);transform:translateY(-2px)}.gr-other--all{--c:var(--ib-amber)}.gr-other__name{font-weight:700;color:var(--ib-heading)}.gr-other__short{font-size:var(--ib-s-1);color:var(--ib-muted)}.gr-switch{margin-bottom:clamp(28px,4vw,44px)}.gr-switch .gr-tiles--small{grid-template-columns:repeat(auto-fill,minmax(112px,150px))}.gr-empty{display:grid;grid-template-columns:auto minmax(0,1fr);gap:clamp(18px,3vw,32px);align-items:center;padding:clamp(22px,4vw,40px);border:1px dashed color-mix(in srgb,var(--c) 60%,var(--ib-line));border-radius:var(--ib-r);background:color-mix(in srgb,var(--c) 5%,var(--ib-surface));}.gr-empty__art{width:clamp(96px,14vw,140px);height:auto;overflow:visible}.gr-empty__thread{fill:none;stroke:var(--c);stroke-width:3;stroke-linecap:round;stroke-dasharray:7 6;animation:gr-thread 1.6s linear infinite;}.gr-empty__needle line{stroke:var(--ib-heading);stroke-width:3.2;stroke-linecap:round}.gr-empty__needle ellipse{fill:var(--ib-bg);stroke:var(--ib-heading);stroke-width:1}.gr-empty__title{margin:0 0 8px;font-size:var(--ib-s2)}.gr-empty p{margin:0 0 18px;color:var(--ib-muted);max-width:40em}.gr-cta{display:inline-flex;align-items:center;gap:10px;padding:11px 20px;border-radius:var(--ib-r);background:var(--ib-amber);color:var(--ib-on-amber);font-weight:700;text-decoration:none;transition:transform .2s ease,box-shadow .2s ease;}.gr-cta .ib-stitch{width:20px;height:20px;color:currentColor}.gr-cta:hover{transform:translateY(-2px);box-shadow:0 14px 24px -18px color-mix(in srgb,var(--ib-amber) 90%,transparent)}.gr-cta:hover .ib-stitch rect{animation:gr-stitch-hover .36s cubic-bezier(.3,1.6,.5,1) var(--d,0ms) both}.gr-pager{display:flex;gap:16px;margin-top:clamp(32px,5vw,48px);padding-top:20px;border-top:1px dashed var(--ib-line);}.gr-pager__link{display:flex;flex-direction:column;gap:2px;max-width:48%;padding:10px 14px;border-radius:var(--ib-r);text-decoration:none;transition:background-color .2s ease;}.gr-pager__link:hover{background:var(--ib-surface)}.gr-pager__next{margin-inline-start:auto;text-align:end}.gr-pager__label{font-size:var(--ib-s-1);color:var(--ib-muted)}.gr-pager__prev .gr-pager__label::before{content:"→ "}.gr-pager__next .gr-pager__label::after{content:" ←"}[dir="ltr"] .gr-pager__prev .gr-pager__label::before{content:"← "}[dir="ltr"] .gr-pager__next .gr-pager__label::after{content:" →"}.gr-pager__name{font-weight:700;color:var(--ib-heading)}.gr-lessons .feed-icon{display:none}.gr-lessons .term{display:none}@keyframes gr-stitch{0%{opacity:0;transform:scale(.15) rotate(-45deg)}60%{opacity:1}100%{opacity:1;transform:none}}@keyframes gr-stitch-hover{0%{opacity:0;transform:scale(.2) rotate(-45deg)}60%{opacity:1}100%{opacity:1;transform:none}}@keyframes gr-thread{to{stroke-dashoffset:-26}}@media (max-width:820px){.gr-hero__inner{grid-template-columns:1fr}.gr-hero__art{order:-1;justify-items:start}.gr-hero .ib-sampler{width:min(100%,380px)}.gr--grade .gr-hero__art{justify-items:center}}@media (max-width:640px){.gr-stairs{grid-template-columns:repeat(2,minmax(0,1fr));align-items:stretch}.gr-stairs__step::after{height:10px}.gr-tile--large .gr-tile__num{height:72px}.gr-tiles{grid-template-columns:repeat(2,minmax(0,1fr))}.gr-tiles--small,.gr-switch .gr-tiles--small{grid-template-columns:repeat(4,minmax(0,1fr))}.gr-tile--small .gr-tile__name{font-size:.75rem}.gr-stage{padding-inline-start:20px}.gr-empty{grid-template-columns:1fr;text-align:center;justify-items:center}}@media (prefers-reduced-motion:reduce){.gr-hero .ib-sampler rect,.gr-patch__x,.gr-patch .gr-patch__icon rect,.gr-tile .ib-num__st rect,.gr-tile.is-sewing .ib-num__st rect,.gr-empty__thread,.gr .ib-stitch rect{animation:none !important}.gr-tile,.gr-other,.gr-cta{transition:none}.gr-tile.is-waiting .ib-num__st rect,.gr-tile.is-waiting .gr-tile__icon rect{opacity:1}}.gr-files{margin-top:clamp(28px,4vw,44px)}.gr-files:first-child{margin-top:0}.gr-files__list{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,300px),1fr));gap:12px}.gr-file{position:relative;display:grid;grid-template-columns:auto minmax(0,1fr) auto;grid-template-areas:"icon text size";align-items:center;gap:6px 14px;height:100%;box-sizing:border-box;padding-block:10px;padding-inline:10px 14px;border:1px solid var(--ib-line);border-radius:var(--ib-r);background:var(--ib-bg);color:var(--ib-heading);text-decoration:none;transition:transform .2s ease,box-shadow .2s ease,border-color .2s ease;}.gr-file__cloth{grid-area:icon;display:grid;place-items:center;width:52px;height:52px;border-radius:3px;background:color-mix(in srgb,var(--c) 9%,var(--ib-surface))}.gr-file .gr-file__icon{width:28px;height:28px;margin:0;color:var(--c);vertical-align:0}.gr-file__text{grid-area:text;display:flex;flex-direction:column;gap:2px;min-width:0}.gr-file__title{font-weight:600;line-height:1.5}.gr-file__meta{font-size:var(--ib-s-1);color:var(--ib-muted)}.gr-file__size{grid-area:size;padding:2px 8px;border-radius:3px;background:var(--ib-surface);color:var(--ib-muted);font-size:var(--ib-s-1);white-space:nowrap}.gr-file::after{content:"";position:absolute;inset-inline:14px;bottom:-2px;height:3px;border-radius:1px;background:repeating-linear-gradient(to left,var(--c) 0 8px,transparent 8px 13px);opacity:0;transition:opacity .2s ease;}.gr-file:hover,.gr-file:focus-visible{border-color:var(--c);transform:translateY(-2px);box-shadow:0 20px 32px -24px color-mix(in srgb,var(--c) 80%,transparent);}.gr-file:hover::after,.gr-file:focus-visible::after{opacity:1}.gr-file:focus-visible{outline:3px solid var(--ib-focus);outline-offset:2px}.gr-file:hover .gr-file__icon rect{animation:gr-stitch-hover .36s cubic-bezier(.3,1.6,.5,1) var(--d,0ms) both}.gr-lessons + .gr-files{margin-top:clamp(32px,5vw,52px)}@media (max-width:640px){.gr-file{grid-template-columns:auto minmax(0,1fr);grid-template-areas:"icon text" "icon size"}.gr-file__size{justify-self:start}}@media (prefers-reduced-motion:reduce){.gr-file{transition:none}}.gr-books{margin-top:clamp(28px,4vw,44px)}.gr-books:first-child{margin-top:0}.gr-lessons + .gr-books{margin-top:clamp(32px,5vw,52px)}.gr-books + .gr-files{margin-top:clamp(32px,5vw,52px)}.gr-shelf{list-style:none;margin:0;padding:8px 0 0;display:grid;grid-template-columns:repeat(auto-fill,minmax(170px,220px));gap:46px 32px;align-items:end;}.gr-shelf__item{position:relative;display:flex;flex-direction:column;align-items:center}.gr-shelf__item::after{content:"";order:1;align-self:stretch;height:12px;margin-inline:-16px;border-radius:2px;background:repeating-linear-gradient(to left,color-mix(in srgb,var(--c) 80%,#FFFFFF) 0 8px,transparent 8px 13px) 0 4px / 100% 2px no-repeat,color-mix(in srgb,var(--c) 22%,var(--ib-surface));box-shadow:0 10px 14px -10px color-mix(in srgb,var(--c) 70%,transparent);}.gr-book{display:block;width:100%;border-radius:16px 4px 4px 16px;text-decoration:none;transform-origin:50% 100%;transition:transform .25s cubic-bezier(.3,1.4,.5,1),filter .25s ease;}.gr-book:hover,.gr-book:focus-visible{transform:translateY(-8px) rotate(-2deg)}.gr-book:focus-visible{outline:3px solid var(--ib-focus);outline-offset:6px}.gr-book__meta{order:2;margin-top:12px;font-size:var(--ib-s-1);color:var(--ib-muted);text-align:center}.gr-books__subject + .gr-books__subject{margin-top:clamp(34px,5vw,50px)}.gr-books__heading{display:flex;align-items:center;gap:10px;margin:0 0 18px;font-family:var(--ib-f-display);font-size:clamp(1.1rem,1vw + .8rem,1.35rem);font-weight:800;color:var(--ib-heading);}.gr-books__heading::before{content:"";flex:none;width:16px;height:16px;border:3px solid #FFFFFF;border-radius:50%;background:var(--book,var(--ib-amber));box-shadow:0 0 0 2px var(--book,var(--ib-amber));}.gr-books__heading::after{content:"";flex:1;height:0;border-top:2px dashed color-mix(in srgb,var(--book,var(--ib-amber)) 45%,transparent);}@media (max-width:640px){.gr-shelf{grid-template-columns:repeat(2,minmax(0,1fr));gap:40px 22px}.gr-shelf__item::after{margin-inline:-11px}}@media (prefers-reduced-motion:reduce){.gr-book{transition:none}.gr-book:hover,.gr-book:focus-visible{transform:none}}.gr--grade .gr-hero__inner{grid-template-columns:auto minmax(0,1fr);gap:clamp(14px,2.4vw,22px);padding-block:clamp(14px,2.2vw,20px);}.gr--grade .gr-hero__art{order:-1;justify-items:start}.gr--grade .gr-patch{width:clamp(72px,8vw,96px);margin:0}.gr--grade .gr-patch__cloth{filter:drop-shadow(0 6px 8px color-mix(in srgb,var(--ib-navy-deep) 20%,transparent))}.gr--grade .gr-title{font-size:clamp(1.45rem,1.05rem + 1.5vw,2.2rem);line-height:1.35}@media (max-width:820px){.gr--grade .gr-hero__inner{grid-template-columns:auto minmax(0,1fr)}.gr--grade .gr-hero__art{order:-1;justify-items:start}}.gr--stage .gr-hero__inner,.gr--all .gr-hero__inner{grid-template-columns:minmax(0,1fr) auto;gap:clamp(14px,2.4vw,24px);padding-block:clamp(14px,2.2vw,20px);}.gr--stage .gr-hero__art,.gr--all .gr-hero__art{order:0;justify-items:end}.gr--stage .gr-hero .ib-sampler,.gr--all .gr-hero .ib-sampler{width:auto;height:clamp(58px,7.5vw,92px);aspect-ratio:2.5}.gr--stage .gr-eyebrow,.gr--all .gr-eyebrow{margin-bottom:2px}.gr--stage .gr-title,.gr--all .gr-title{font-size:clamp(1.45rem,1.05rem + 1.5vw,2.2rem);line-height:1.35}@media (max-width:820px){.gr--stage .gr-hero__inner,.gr--all .gr-hero__inner{grid-template-columns:minmax(0,1fr) auto}.gr--stage .gr-hero__art,.gr--all .gr-hero__art{order:0;justify-items:end}.gr--stage .gr-hero .ib-sampler,.gr--all .gr-hero .ib-sampler{width:auto}}.gr-hero{padding-top:clamp(6px,1vw,10px);border-bottom:0;background:none;}.gr-hero__inner{width:calc(100% - 2 * var(--ib-gutter));max-width:calc(var(--ib-wrap) - 2 * var(--ib-gutter));padding-inline:clamp(16px,3vw,24px);border:1px solid var(--ib-line);border-radius:var(--ib-r);background-color:var(--ib-surface);background-image:radial-gradient(circle,var(--gr-dot) 1.1px,transparent 1.5px);background-size:12px 12px;background-position:6px 6px;}.gr-body{padding-top:clamp(12px,2vw,16px)}
.book-cover{--book:#1E9BD7;--book-deep:#13729F;position:relative;display:flex;flex-direction:column;align-items:center;gap:8px;box-sizing:border-box;width:100%;aspect-ratio:3 / 4;padding:14px 14px 16px;padding-inline-start:24px;overflow:hidden;border-radius:4px 16px 16px 4px;background:radial-gradient(circle,rgb(255 255 255 / .16) 1.2px,transparent 1.6px) 0 0 / 12px 12px,var(--book);color:#FFFFFF;text-align:center;box-shadow:0 2px 0 var(--book-deep),0 18px 30px -16px rgb(18 40 74 / .55);}[dir="rtl"] .book-cover{border-radius:16px 4px 4px 16px}.book-cover::before{content:"";position:absolute;inset-block:0;inset-inline-start:0;width:12px;background:linear-gradient(to left,rgb(0 0 0 / .05),rgb(0 0 0 / .22));box-shadow:inset -1px 0 0 rgb(255 255 255 / .25);}[dir="rtl"] .book-cover::before{background:linear-gradient(to right,rgb(0 0 0 / .05),rgb(0 0 0 / .22));box-shadow:inset 1px 0 0 rgb(255 255 255 / .25)}:is(.book-cover,.book-tint).is-sky{--book:#1E9BD7;--book-deep:#13729F}:is(.book-cover,.book-tint).is-rose{--book:#D9487F;--book-deep:#A62F5E}:is(.book-cover,.book-tint).is-green{--book:#2E8B47;--book-deep:#1F6533}:is(.book-cover,.book-tint).is-amber{--book:#E8930C;--book-deep:#B06B00}:is(.book-cover,.book-tint).is-violet{--book:#7A4FD0;--book-deep:#5A35A6}:is(.book-cover,.book-tint).is-teal{--book:#0F8A83;--book-deep:#0A645F}:is(.book-cover,.book-tint).is-coral{--book:#E2603F;--book-deep:#B2432A}:is(.book-cover,.book-tint).is-indigo{--book:#3F51B5;--book-deep:#2C3A8C}.book-cover__art{display:block;width:100%;aspect-ratio:4 / 3;padding:5px;box-sizing:border-box;border-radius:12px;background:#FFFFFF;outline:2px dashed rgb(255 255 255 / .85);outline-offset:3px;}.book-cover__art img{display:block;width:100%;height:100%;object-fit:cover;border-radius:8px}.book-cover__title{margin-top:6px;font-family:var(--ib-f-display);font-size:clamp(1.05rem,1.6vw + .4rem,1.45rem);font-weight:800;line-height:1.35;text-shadow:0 2px 0 var(--book-deep);}.book-cover__part{padding:3px 14px 4px;border-radius:99px;background:#FFFFFF;color:var(--book-deep);font-size:.85rem;font-weight:700;}.book-cover__badge{position:absolute;top:10px;inset-inline-end:10px;display:grid;place-items:center;width:40px;height:40px;border:3px solid #FFFFFF;border-radius:50%;background:var(--ib-amber);color:var(--ib-navy-deep);font-family:var(--ib-f-display);font-size:1.2rem;font-weight:800;line-height:1;transform:rotate(-8deg);box-shadow:0 6px 12px -6px rgb(18 40 74 / .6);}.book-cover.is-amber .book-cover__badge{background:#FFFFFF}.book-cover--large{padding:18px 18px 22px;padding-inline-start:30px;gap:12px}.book-cover--large .book-cover__title{font-size:clamp(1.3rem,2vw + .6rem,1.8rem)}.book-cover--large .book-cover__part{font-size:.95rem}.book-cover--large .book-cover__badge{width:52px;height:52px;font-size:1.5rem}
@media (prefers-color-scheme:dark){:root{--ib-navy-fill:#1A365D;--ib-navy-fill-line:color-mix(in srgb,#8FB3E6 22%,transparent);--ib-navy-hover:color-mix(in srgb,var(--ib-navy) 82%,#FFFFFF);}.qb-hero,.oer-card,.qb-review-head,.qb-cta__badge{background:var(--ib-navy-fill);outline:1px solid var(--ib-navy-fill-line);outline-offset:-1px;}.qb-btn--navy,.qb-chip.is-active,.qb-chip[aria-pressed="true"],.qb-tab.is-active,.qb-seg button[aria-pressed="true"],.qb-qnum,.qb-choice.is-selected .qb-choice__letter,.oer .oer-btn--primary,.oer-tab.is-active,.ihub-btn--primary,.ihub .ihub-btn--primary,.ihub-seg__btn[aria-pressed="true"],.ihub-row__go,.ihub-switch button[aria-selected="true"],.ihub-cta .ihub-btn,.ihub-sent__steps span,.ihub-auth__tab[aria-selected="true"] .ihub-auth__ic,.ihub-tab[aria-selected="true"] .ihub-tab__mark,.ihub-pl[aria-current="true"] .ihub-pl__n{color:var(--ib-bg);}.qb-tab.is-active small{color:color-mix(in srgb,var(--ib-bg) 72%,transparent);}.oer-tab.is-active .oer-dot{background:var(--ib-bg);}.oer .oer-btn--primary:hover,.ihub-btn--primary:hover,.ihub .ihub-btn--primary:hover,.ihub-row__go:hover,.ihub-cta .ihub-btn:hover{background:var(--ib-navy-hover);border-color:var(--ib-navy-hover);color:var(--ib-bg);}.oer.oer-card .oer-btn--primary,.oer.oer-card .oer-btn--primary:hover{background:var(--oer-amber);border-color:var(--oer-amber);color:var(--ib-on-amber);}.button--danger,.vl-poster__btn,.oer-lesson__vid:hover,.oer-done[aria-pressed="true"],.oer-tick[aria-pressed="true"],.vl-item.is-seen .vl-item__seen{color:var(--ib-bg);}.qb-steps li::before,.qb-cta .qb-btn,.qb-tocbadge:hover{color:var(--ib-on-amber);}.qb-cta__units a{background:var(--ib-bg);}.qb-ai__box{background:var(--ib-surface);}}