.books-page main,.book-page main{--bk-radius:18px;--bk-cover-radius:6px;--bk-cover-shadow:0 18px 40px #11112838, 0 2px 6px #1111281f}:root[data-theme=dark] .books-page main,:root[data-theme=dark] .book-page main{--bk-cover-shadow:0 18px 44px #0009, 0 0 0 1px #ffffff14}.bk-eyebrow{color:var(--ms-tint);letter-spacing:.07em;text-transform:uppercase;margin-bottom:14px;font-size:13px;font-weight:650;display:block}.bk-hero h1,.bk-section h2{text-wrap:balance;letter-spacing:-.035em}.bk-cover{aspect-ratio:1100/1424;object-fit:cover;border-radius:var(--bk-cover-radius);width:100%;height:auto;box-shadow:var(--bk-cover-shadow);background:#fff;display:block}.bk-cover.bk-a4{aspect-ratio:1100/1556;width:91.52%;margin-inline:auto}.bk-intro{text-align:center;padding-block:clamp(44px,7vw,88px) clamp(20px,3vw,32px)}.bk-intro h1{letter-spacing:-.05em;text-wrap:balance;font-size:clamp(38px,5.6vw,64px);line-height:1.06}.bk-intro .ms-lede{margin-inline:auto}.bk-chips{flex-wrap:wrap;justify-content:center;gap:8px;margin-top:22px;display:flex}.bk-shelf+.bk-shelf{margin-top:clamp(40px,6vw,64px)}.bk-shelf-title{letter-spacing:-.03em;margin:0 0 clamp(16px,2.4vw,24px);font-size:clamp(24px,2.6vw,30px);line-height:1.2}.bk-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:clamp(16px,2.4vw,28px);display:grid}.bk-card{border-radius:var(--bk-radius);background:var(--ms-surface);box-shadow:var(--ms-shadow-card);grid-template-columns:minmax(120px,38%) minmax(0,1fr);align-items:start;gap:clamp(16px,2.4vw,28px);padding:clamp(18px,2.4vw,28px);display:grid}.bk-card-cover{border-radius:var(--bk-cover-radius);display:block}.bk-card-meta{color:var(--ms-ink-3);font-size:13px;font-weight:500;display:block}.bk-card h2,.bk-card h3{letter-spacing:-.02em;margin:8px 0 0;font-size:clamp(20px,2vw,24px);line-height:1.2}.bk-card h2 a,.bk-card h3 a{color:inherit}.bk-card-sub{color:var(--ms-ink);margin:8px 0 0;font-weight:500;line-height:1.45}.bk-card p.bk-card-copy{color:var(--ms-ink-2);margin:10px 0 0;font-size:15px;line-height:1.55}.bk-card-foot{flex-wrap:wrap;align-items:center;gap:10px 16px;margin-top:18px;display:flex}.bk-price{letter-spacing:-.02em;color:var(--ms-ink);font-size:22px;font-weight:700}.bk-price small{color:var(--ms-ink-3);letter-spacing:0;margin-left:6px;font-size:13px;font-weight:500}.books-page .checkout-status,.book-page .checkout-status{min-height:1.4em;color:var(--ms-ink-2);margin:14px 0 0;font-size:14px}.books-page .checkout-status.is-error,.book-page .checkout-status.is-error{color:#d1323b}.bk-section{padding-block:clamp(40px,6vw,72px)}.bk-section h2{font-size:var(--ms-text-title);line-height:1.15}.bk-steps{counter-reset:bk-step;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(14px,2vw,22px);margin:26px 0 0;padding:0;list-style:none;display:grid}.bk-steps li{border-radius:var(--bk-radius);background:var(--ms-surface);box-shadow:var(--ms-shadow-card);counter-increment:bk-step;padding:22px}.bk-steps li:before{content:counter(bk-step, decimal-leading-zero);color:var(--ms-tint);letter-spacing:.06em;margin-bottom:10px;font-size:13px;font-weight:700;display:block}.bk-steps strong{color:var(--ms-ink);font-size:17px;display:block}.bk-steps p{color:var(--ms-ink-2);margin:8px 0 0;font-size:15px;line-height:1.55}.bk-section .ms-faq{max-width:820px;margin:22px 0 0}.bk-hero{padding-block:clamp(28px,5vw,64px) clamp(36px,5vw,64px)}.bk-hero-grid{grid-template-columns:minmax(0,.82fr) minmax(0,1.18fr);align-items:center;gap:clamp(28px,5vw,72px);display:grid}.bk-hero-cover{justify-self:center;width:100%;max-width:400px;margin:0}.bk-hero h1{font-size:clamp(36px,5vw,58px);line-height:1.05}.bk-subtitle{color:var(--ms-ink);margin:14px 0 0;font-size:clamp(18px,2vw,22px);font-weight:500;line-height:1.4}.bk-hero .ms-lede{font-size:17px;line-height:1.6}.bk-buy-row{flex-wrap:wrap;align-items:center;gap:12px 18px;margin-top:26px;display:flex}.bk-buy-row .bk-price{font-size:30px}.bk-facts{grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;margin:26px 0 0;display:grid}.bk-facts div{background:var(--ms-surface);border:1px solid var(--ms-line-soft);border-radius:12px;padding:12px 14px}.bk-facts dt{letter-spacing:.04em;text-transform:uppercase;color:var(--ms-ink-3);font-size:12px;font-weight:600}.bk-facts dd{color:var(--ms-ink);margin:4px 0 0;font-size:15px;font-weight:600}.bk-two{grid-template-columns:minmax(0,1.1fr) minmax(0,.9fr);align-items:start;gap:clamp(24px,4vw,56px);display:grid}.bk-prose h2{letter-spacing:-.025em;font-size:clamp(24px,2.6vw,32px);line-height:1.2}.bk-lessons-title{margin-top:clamp(40px,6vw,64px)}.bk-prose p{color:var(--ms-ink-2);margin:14px 0 0;font-size:17px;line-height:1.65}.bk-checks{border-radius:var(--bk-radius);background:var(--ms-surface);box-shadow:var(--ms-shadow-card);margin:0;padding:22px 24px;list-style:none}.bk-checks li{color:var(--ms-ink);border-bottom:1px solid var(--ms-line-soft);padding:10px 0 10px 30px;font-size:15.5px;line-height:1.5;position:relative}.bk-checks li:last-child{border-bottom:0}.bk-checks li:before{content:"✓";color:var(--ms-tint);font-weight:700;position:absolute;top:10px;left:2px}.bk-quote{border-left:3px solid var(--ms-tint);color:var(--ms-ink);margin:26px 0 0;padding:4px 0 4px 18px;font-size:18px;line-height:1.5}.bk-previews{scroll-snap-type:x mandatory;overscroll-behavior-x:contain;scrollbar-width:thin;grid-auto-columns:minmax(220px,260px);grid-auto-flow:column;gap:18px;margin:24px 0 0;padding:4px 4px 16px;display:grid;overflow-x:auto}.bk-previews figure{scroll-snap-align:start;margin:0}.bk-previews a{border-radius:8px;display:block}.bk-previews img{aspect-ratio:1200/1553;width:100%;height:auto;display:block}.bk-previews.bk-a4 img{aspect-ratio:1200/1697}.bk-previews img{border:1px solid var(--ms-line);box-shadow:var(--ms-shadow-card);background:#fff;border-radius:8px}.bk-previews figcaption{color:var(--ms-ink-2);margin-top:12px;font-size:14px;line-height:1.5}.bk-previews figcaption strong{color:var(--ms-ink);font-size:15px;display:block}.bk-note{color:var(--ms-ink-3);margin:10px 0 0;font-size:14px}.bk-study{gap:14px;display:grid}.bk-study div{border-radius:var(--bk-radius);background:var(--ms-surface);box-shadow:var(--ms-shadow-card);padding:20px 22px}.bk-study h3{letter-spacing:.06em;text-transform:uppercase;color:var(--ms-tint);margin:0;font-size:13px;font-weight:650}.bk-study p{color:var(--ms-ink-2);margin:8px 0 0;font-size:15.5px;line-height:1.6}.bk-lessons{grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(12px,1.8vw,20px);margin:26px 0 0;padding:0;list-style:none;display:grid}.bk-lessons li{border-radius:var(--bk-radius);background:var(--ms-surface);box-shadow:var(--ms-shadow-card);padding:20px 22px}.bk-lessons span{color:var(--ms-tint);letter-spacing:.06em;font-size:13px;font-weight:700;display:block}.bk-lessons h3{margin:8px 0 0;font-size:17px}.bk-lessons p{color:var(--ms-ink-2);margin:6px 0 0;font-size:15px;line-height:1.55}.bk-topics{flex-wrap:wrap;gap:8px;margin-top:20px;display:flex}.bk-topics .ms-chip{padding:5px 12px;font-size:13px}.bk-buy{border-radius:var(--ms-radius-lg);background:var(--ms-surface);box-shadow:var(--ms-shadow-card);grid-template-columns:minmax(0,1fr) minmax(0,1fr);align-items:center;gap:clamp(22px,4vw,48px);padding:clamp(24px,4vw,48px);display:grid}.bk-buy h2{margin:0}.bk-buy .bk-price{margin-top:14px;font-size:34px;display:block}.bk-buy .ms-btn{margin-top:18px}.bk-buy ul{margin:0;padding:0;list-style:none}.bk-buy li{color:var(--ms-ink-2);padding:9px 0 9px 28px;font-size:15.5px;line-height:1.5;position:relative}.bk-buy li:before{content:"✓";color:var(--ms-tint);font-weight:700;position:absolute;top:9px;left:2px}.bk-more-head{flex-wrap:wrap;justify-content:space-between;align-items:baseline;gap:8px 20px;display:flex}.bk-more{grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(14px,2vw,24px);margin-top:24px;display:grid}.bk-more .bk-card{grid-template-columns:minmax(90px,36%) minmax(0,1fr);padding:18px}.bk-more .bk-card h3{font-size:18px}@media (width<=960px){.bk-more{grid-template-columns:1fr}.bk-facts,.bk-lessons{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (width<=760px){.bk-grid,.bk-hero-grid,.bk-two,.bk-buy,.bk-steps,.bk-lessons{grid-template-columns:1fr}.bk-hero-cover{max-width:260px}.bk-intro{text-align:left}.bk-chips{justify-content:flex-start}}@media (width<=420px){.bk-card{grid-template-columns:minmax(96px,34%) minmax(0,1fr);gap:14px;padding:16px}.bk-card h2,.bk-card h3{font-size:18px}}.bk-cover-type{box-sizing:border-box;aspect-ratio:1100/1424;color:#1d1d1f;text-align:left;background:linear-gradient(160deg,#fff 0%,#f3f3fb 100%);border:1px solid #00000014;flex-direction:column;gap:.6em;padding:13% 11%;display:flex;overflow:hidden;container-type:inline-size}.bk-cover-type.bk-a4{aspect-ratio:1100/1556}.bk-cover-kicker{letter-spacing:.12em;text-transform:uppercase;color:#4645e0;font-size:5.2cqi;font-weight:650}.bk-cover-title{letter-spacing:-.03em;font-size:13cqi;font-weight:700;line-height:1.04}.bk-cover-sub{color:#4a4a52;font-size:5.6cqi;line-height:1.4}.bk-cover-brand{color:#6e6e73;margin-top:auto;font-size:4.6cqi}