/* CoreKnowledge Books: landing, product page, look-inside. Uses site tokens (navy, muted) + quantum buttons from ck-ui.css */
body.books{background:#F4F6FC}
.bk-hero{background:linear-gradient(115deg,#1B2766,#2B3A9A 38%,#5B2F99 72%,#8E2A8F);color:#fff;position:relative;overflow:hidden}
.bk-hero::after{content:"";position:absolute;right:-140px;top:-180px;width:520px;height:520px;border-radius:50%;border:64px solid rgba(255,255,255,.07)}
.bk-hero .wrap{position:relative;z-index:1;padding-top:48px;padding-bottom:56px;display:flex;gap:48px;align-items:center;flex-wrap:wrap}
.bk-hero .bk-txt{flex:1 1 460px;min-width:0}
.bk-kick{display:inline-block;background:rgba(255,255,255,.15);border:1px solid rgba(255,255,255,.3);border-radius:999px;padding:6px 14px;font-size:12px;font-weight:800;letter-spacing:.1em;text-transform:uppercase;color:#fff}
.bk-hero h1{font-family:'Cabin',sans-serif;font-size:clamp(34px,4.4vw,54px);line-height:1.06;margin:16px 0 12px;color:#fff!important}
.bk-hero h1 em{font-style:normal;color:#FDE68A}
.bk-hero p.lead{font-size:18px;color:#EEF0FF!important;max-width:600px;margin:0 0 20px;line-height:1.55}
.bk-hero .bk-meta{display:flex;gap:10px;flex-wrap:wrap;margin:0 0 22px;padding:0;list-style:none}
.bk-hero .bk-meta li{background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.28);border-radius:999px;padding:6px 14px;font-weight:700;font-size:14px;color:#fff}
.bk-btns{display:flex;gap:12px;flex-wrap:wrap}
.bk-trust{margin:16px 0 0;font-size:14px;color:#DCE0F5!important}
/* 3D cover */
.bk-cover{flex:0 0 auto;perspective:1100px;padding:10px 24px 20px}
.bk-book{position:relative;width:min(300px,62vw);aspect-ratio:1240/1754;transform:rotateY(-24deg) rotateX(3deg);transform-style:preserve-3d;transition:transform .6s cubic-bezier(.2,.7,.2,1);margin:0 auto}
.bk-cover:hover .bk-book{transform:rotateY(-8deg) rotateX(1deg)}
.bk-book img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;border-radius:3px 8px 8px 3px;box-shadow:0 30px 50px -14px rgba(0,0,0,.55);-webkit-user-drag:none}
.bk-book::before{content:"";position:absolute;left:0;top:2px;bottom:2px;width:30px;background:linear-gradient(90deg,#fff,#E8EAF4 60%,#C9CEE4);transform:rotateY(-90deg) translateX(-15px);transform-origin:left center;border-radius:2px}
.bk-book::after{content:"";position:absolute;inset:0;border-radius:3px 8px 8px 3px;background:linear-gradient(100deg,rgba(255,255,255,0) 0,rgba(255,255,255,.28) 2.5%,rgba(0,0,0,.18) 4%,rgba(255,255,255,.08) 7%,rgba(255,255,255,0) 30%);pointer-events:none}
.bk-shadow{width:70%;height:22px;margin:12px auto 0;background:radial-gradient(ellipse at center,rgba(0,0,0,.35),rgba(0,0,0,0) 70%)}
/* sections */
.bk-main{max-width:1240px;margin:0 auto;padding:34px 24px 60px}
.bk-sec{margin:0 0 40px}
.bk-sec>h2{font-family:'Cabin',sans-serif;font-size:32px;color:var(--navy);margin:0 0 6px}
.bk-sec>p.sub{margin:0 0 18px;color:var(--muted);font-size:16px}
.bk-band{margin:0 0 30px}
.bk-band h3{font-family:'Cabin',sans-serif;font-size:22px;color:#1B2766;margin:0 0 12px;border-left:5px solid #4A68EA;padding-left:12px;display:flex;gap:10px;align-items:center}
.bk-band h3 small{font-size:12px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;background:#E3E7F5;color:#5A6185;border-radius:999px;padding:3px 10px}
.bk-band.soon h3{border-left-color:#B8BFDD}
.bk-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(340px,1fr));gap:14px}
.bk-card{display:grid;grid-template-columns:96px 1fr;gap:14px;align-items:center;background:#fff;border:2px solid #DDE2F2;border-radius:18px;padding:14px;text-decoration:none;color:inherit;position:relative;transition:transform .15s,box-shadow .15s,border-color .15s}
.bk-card .th{width:96px;aspect-ratio:1240/1754;border-radius:3px 7px 7px 3px;object-fit:cover;box-shadow:0 10px 20px -8px rgba(27,39,102,.5)}
.bk-card .ph{width:96px;aspect-ratio:1240/1754;border-radius:3px 7px 7px 3px;border:2px dashed #CBD1E8;background:#EEF0F8;display:grid;place-items:center;color:#8A91B6;font-weight:800;font-size:13px;text-align:center}
.bk-card .cd{display:inline-block;background:linear-gradient(135deg,#1F3496,#4A68EA);color:#fff;border-radius:9px;padding:3px 9px;font-weight:800;font-size:12px}
.bk-card h4{font-family:'Cabin',sans-serif;font-size:18px;line-height:1.25;color:var(--navy);margin:6px 0 4px}
.bk-card p{margin:0;font-size:14px;color:var(--muted)}
.bk-card .st{display:inline-block;margin-left:6px;vertical-align:middle;font-size:12px;font-weight:800;letter-spacing:.08em;border-radius:999px;padding:3px 9px;background:#2B3A9A;color:#fff;text-transform:uppercase}
.bk-card.live:hover{border-color:#4A68EA;transform:translateY(-2px);box-shadow:0 12px 26px rgba(40,56,136,.16)}
.bk-card.soon{border-style:dashed;background:#F4F6FC;opacity:.8}.bk-card.soon .st{background:#E3E7F5;color:#5A6185}
.bk-card.soon .cd{background:#8A91B6}
.bk-card .go{display:inline-flex;margin-top:8px;font-weight:800;font-size:14px;color:#2B3A9A}
/* what's inside tiles */
.bk-tiles{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:12px}
.bk-tile{background:#fff;border:2px solid #DDE2F2;border-radius:18px;padding:18px 14px;text-align:center}
.bk-tile svg{color:#2B3A9A;margin-bottom:6px}
.bk-tile b{display:block;font-family:'Cabin',sans-serif;font-size:30px;line-height:1;color:var(--navy)}
.bk-tile span{display:block;margin-top:6px;font-size:14px;font-weight:700;color:var(--muted)}
/* format chooser: reuses .ckp-* */
.bk-fmt .ckp-card.pick{border-color:#2B3A9A;box-shadow:0 14px 30px -12px rgba(43,58,154,.45)}
.bk-price{font-family:'Cabin',sans-serif;font-size:28px;font-weight:700;color:var(--navy);margin:2px 0 0}
.bk-price small{font-size:13px;font-weight:600;color:var(--muted);margin-left:6px}
.bk-ul{list-style:none;margin:6px 0 10px;padding:0;font-size:14px;color:var(--muted);line-height:1.6;flex:1}
.bk-ul li{padding-left:22px;position:relative}.bk-ul li::before{content:"";position:absolute;left:3px;top:.55em;width:9px;height:5px;border-left:2px solid #047857;border-bottom:2px solid #047857;transform:rotate(-45deg)}
.bk-note{margin:12px 0 0;font-size:14px;color:var(--muted)}
.bk-note a,.bk-faq a{color:#2B3A9A;font-weight:700}
/* FAQ */
.bk-faq details{background:#fff;border:2px solid #DDE2F2;border-radius:14px;padding:0;margin:0 0 10px}
.bk-faq summary{cursor:pointer;padding:14px 18px;font-weight:800;color:var(--navy);list-style:none;display:flex;justify-content:space-between;gap:12px}
.bk-faq summary::-webkit-details-marker{display:none}
.bk-faq summary::after{content:"+";font-size:22px;line-height:1;color:#2B3A9A}
.bk-faq details[open] summary::after{content:"\2013"}
.bk-faq details p{margin:0;padding:0 18px 16px;color:var(--muted);font-size:15px;line-height:1.6}
.bk-pair{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:14px}
.bk-pair a{display:flex;gap:14px;align-items:center;background:#fff;border:2px solid #DDE2F2;border-radius:18px;padding:16px;text-decoration:none;color:inherit}
.bk-pair a:hover{border-color:#4A68EA}.bk-pair b{display:block;color:var(--navy);font-family:'Cabin',sans-serif;font-size:18px}.bk-pair span{font-size:14px;color:var(--muted)}
/* look inside viewer */
.bk-modal{position:fixed;inset:0;z-index:300;background:rgba(18,26,70,.97);display:none;flex-direction:column;align-items:center;padding:14px 12px}
.bk-modal.on{display:flex}
.bk-mtop{width:100%;max-width:1000px;display:flex;justify-content:space-between;align-items:center;color:#fff;margin-bottom:8px;gap:10px}
.bk-mtop b{font-family:'Cabin',sans-serif;font-size:18px}
.bk-x{background:#fff;color:#1B2766;border:0;border-radius:12px;min-height:44px;padding:0 18px;font-weight:800;cursor:pointer}
.bk-stage{flex:1;min-height:0;display:flex;align-items:center;justify-content:center;gap:10px;width:100%;max-width:1000px;perspective:1800px}
.bk-pg{height:100%;max-height:calc(100vh - 190px);aspect-ratio:1/1.414;position:relative;transform-origin:left center}
.bk-pg img{width:100%;height:100%;object-fit:contain;background:#fff;border-radius:4px;box-shadow:0 20px 50px rgba(0,0,0,.5);-webkit-user-drag:none;user-select:none}
.bk-pg.flipn{animation:bkflipn .45s ease both}.bk-pg.flipp{animation:bkflipp .45s ease both}
@keyframes bkflipn{from{transform:rotateY(70deg);opacity:.2}to{transform:none;opacity:1}}
@keyframes bkflipp{from{transform:rotateY(-70deg);opacity:.2}to{transform:none;opacity:1}}
.bk-nv{flex:none;width:52px;height:52px;border-radius:50%;border:0;background:#fff;color:#1B2766;font-size:26px;font-weight:800;cursor:pointer;display:grid;place-items:center}
.bk-nv:disabled{opacity:.35;cursor:default}
.bk-thumbs{display:flex;gap:8px;margin-top:10px;overflow-x:auto;max-width:100%;padding:4px}
.bk-thumbs button{flex:none;border:3px solid transparent;border-radius:6px;padding:0;background:#fff;cursor:pointer;width:54px}
.bk-thumbs button.cur{border-color:#D61F1F}.bk-thumbs img{width:100%;display:block;border-radius:3px}
.bk-cap{color:#fff;font-weight:700;font-size:15px;margin-top:8px;text-align:center}
.bk-cap small{display:block;font-weight:500;color:#C7CCEB}
@media (max-width:900px){.bk-tiles{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media (max-width:640px){.bk-hero .wrap{padding-top:34px;padding-bottom:40px;gap:20px}.bk-tiles{grid-template-columns:repeat(2,minmax(0,1fr))}.bk-sec>h2{font-size:26px}.bk-stage{position:relative}.bk-nv{position:absolute;top:50%;transform:translateY(-50%);z-index:3;width:42px;height:42px;font-size:22px;box-shadow:0 4px 14px rgba(0,0,0,.28)}.bk-prev{left:6px}.bk-next{right:6px}.bk-thumbs button{width:42px}.bk-grid{grid-template-columns:1fr}}
@media (prefers-reduced-motion:reduce){.bk-book,.bk-pg.flipn,.bk-pg.flipp{animation:none;transition:none}}

.bk-ghost{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 22px;border-radius:12px;border:2px solid rgba(255,255,255,.65);color:#fff!important;font-weight:800;text-decoration:none;background:rgba(255,255,255,.08)}.bk-ghost:hover{background:rgba(255,255,255,.2)}

/* ================= v2 (17 Oct 2026): shop v2 - announcement, hook line, gallery, buy box, connected flow, contents, lead form ================= */
.bk-announce{background:#D61F1F;color:#fff;font-size:14px;font-weight:600;text-align:center}
.bk-announce .wrap{padding-top:8px;padding-bottom:8px}
.bk-announce b{color:#FDE68A!important;margin-right:4px}.bk-announce a{color:#fff!important;font-weight:800;margin-left:8px;text-decoration:underline}
.bk-hookline{list-style:none;margin:0 0 14px;padding:0;display:flex;flex-wrap:wrap;gap:6px 16px}
.bk-hookline li{display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:700;color:#FDE68A!important}
.bk-hookline svg{flex:none}
.bk-hero .bk-meta li{display:inline-flex;align-items:center;gap:6px}
.bk-hero .bk-meta li.new{background:#D61F1F;border-color:#D61F1F}
/* product hero: gallery + buy box */
.bk-phero .wrap{align-items:flex-start}
.bk-gal{flex:0 1 400px;min-width:0;max-width:100%}
.bk-gmain{position:relative;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.2);border-radius:18px;padding:18px;display:grid;place-items:center;aspect-ratio:4/5;cursor:zoom-in}
.bk-gmain img{max-width:100%;max-height:100%;object-fit:contain;border-radius:3px 8px 8px 3px;box-shadow:0 26px 44px -16px rgba(0,0,0,.6);-webkit-user-drag:none;user-select:none}
.bk-gmain.spread img{border-radius:6px}
.bk-gzoom{position:absolute;right:12px;bottom:12px;display:inline-flex;align-items:center;gap:6px;min-height:44px;padding:0 14px;border:0;border-radius:12px;background:#fff;color:#1B2766;font-weight:800;font-size:14px;cursor:pointer;box-shadow:0 10px 22px -8px rgba(0,0,0,.5)}
.bk-gzoom:hover{background:#FDE68A}
.bk-gthumbs{display:flex;gap:8px;margin-top:10px;overflow-x:auto;padding:2px}
.bk-gth{flex:none;height:72px;padding:3px;border:2px solid rgba(255,255,255,.3);border-radius:10px;background:rgba(255,255,255,.1);cursor:pointer}
.bk-gth img{height:100%;width:auto;display:block;border-radius:4px;pointer-events:none}
.bk-gth.on{border-color:#FDE68A;background:rgba(253,230,138,.18)}
.bk-gth:focus-visible,.bk-gzoom:focus-visible,.bk-seg button:focus-visible{outline:3px solid #FDE68A;outline-offset:2px}
.bk-buy{background:#fff;color:var(--ink);border-radius:20px;padding:18px;margin-top:18px;box-shadow:0 24px 50px -22px rgba(0,0,0,.55);max-width:620px}
.bk-opt{margin:0 0 12px}
.bk-ol{display:block;font-size:12px;font-weight:800;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin:0 0 6px}
.bk-seg{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:6px}
.bk-seg button{min-height:48px;border:2px solid #DDE2F2;border-radius:12px;background:#fff;color:#1B2766;font:700 14px/1.2 'Public Sans',sans-serif;cursor:pointer;padding:6px 8px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;text-align:center;transition:border-color .15s,background .15s}
.bk-seg button small{font-size:12px;font-weight:800;color:#047857}
.bk-seg button:hover{border-color:#4A68EA}
.bk-seg button[aria-checked="true"]{border-color:#2B3A9A;background:linear-gradient(135deg,#1F3496,#4A68EA);color:#fff;box-shadow:0 8px 18px -10px rgba(43,58,154,.8)}
.bk-seg button[aria-checked="true"] small{color:#FDE68A}
.bk-sum{display:flex;flex-wrap:wrap;justify-content:space-between;gap:6px 16px;border-top:2px solid #EEF0F8;padding-top:12px}
.bk-sel{display:block;font-weight:800;color:#1B2766;font-size:15px}
.bk-pr{display:flex;align-items:baseline;gap:8px}.bk-pr b{font-family:'Cabin',sans-serif;font-size:28px;color:#1B2766}.bk-pr small{font-size:13px;font-weight:600;color:var(--muted)}
.bk-inc{list-style:none;margin:0;padding:0;font-size:14px;color:var(--muted);line-height:1.6}
.bk-inc li{padding-left:20px;position:relative}.bk-inc li::before{content:"";position:absolute;left:3px;top:.55em;width:9px;height:5px;border-left:2px solid #047857;border-bottom:2px solid #047857;transform:rotate(-45deg)}
.bk-cta{display:flex;flex-wrap:wrap;gap:10px;margin-top:14px}
.bk-cta .btn{flex:1 1 200px;justify-content:center}
.bk-wa{display:inline-flex;align-items:center;gap:8px}
.bk-off{margin:10px 0 0;font-size:13px;color:var(--muted)}
/* connected to live practice */
.bk-eyebrow{display:inline-flex;align-items:center;gap:6px;font-size:12px;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:#D61F1F}
.bk-conn-in{background:linear-gradient(135deg,#F0F3FF,#FFFFFF 55%,#FFF7E0);border:2px solid #C9D2F5;border-radius:24px;padding:28px;box-shadow:0 18px 40px -26px rgba(27,39,102,.45)}
.bk-conn h2{font-family:'Cabin',sans-serif;font-size:32px;color:var(--navy);margin:6px 0 6px}
.bk-conn .sub{color:var(--muted);font-size:16px;margin:0 0 18px;max-width:760px}
.bk-flow{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:1fr 40px 1fr 40px 1fr;align-items:stretch;gap:8px}
.bk-flow li:not(.ar){position:relative;background:#fff;border:2px solid #DDE2F2;border-radius:18px;padding:20px 16px 16px;display:flex;flex-direction:column;gap:6px}
.bk-flow li svg{color:#2B3A9A}
.bk-flow li b{font-family:'Cabin',sans-serif;font-size:19px;color:var(--navy)}
.bk-flow li span:not(.n){font-size:14px;color:var(--muted);line-height:1.5}
.bk-flow .n{position:absolute;top:-12px;left:14px;width:28px;height:28px;border-radius:50%;background:#D61F1F;color:#fff;font-weight:800;display:grid;place-items:center;font-size:14px}
.bk-flow .ar{display:grid;place-items:center;color:#D61F1F}
.bk-match{display:flex;gap:8px;align-items:flex-start;margin:16px 0 18px;font-weight:700;color:#1B2766}
.bk-match svg{color:#047857;flex:none;margin-top:2px}
.bk-ghost2{display:inline-flex;align-items:center;min-height:48px;padding:0 20px;border-radius:12px;border:2px solid #B9C2E6;color:#1B2766!important;font-weight:800;text-decoration:none;background:#fff}
.bk-ghost2:hover{border-color:#4A68EA}
/* what's inside: word tiles + contents */
.bk-tile b.w{font-size:19px;line-height:1.2}
.bk-h3{font-family:'Cabin',sans-serif;font-size:22px;color:var(--navy);margin:26px 0 12px}
.bk-toc{display:grid;grid-template-columns:260px 1fr;gap:14px;align-items:start}
.bk-tocside,.bk-part{background:#fff;border:2px solid #DDE2F2;border-radius:18px;padding:14px 16px}
.bk-tocside h3{font-size:13px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin:0 0 6px}
.bk-tocside ul+h3{margin-top:12px}
.bk-tocside ul,.bk-part ul{list-style:none;margin:0;padding:0;font-size:14px;line-height:1.45}
.bk-tocside li{padding:4px 0;color:var(--ink);border-bottom:1px solid #EEF0F8}
.bk-parts{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.bk-part h3{display:flex;gap:10px;align-items:center;font-family:'Cabin',sans-serif;font-size:17px;line-height:1.25;color:var(--navy);margin:0 0 8px}
.bk-part h3 span{flex:none;width:30px;height:30px;border-radius:9px;background:linear-gradient(135deg,#1F3496,#4A68EA);color:#fff;display:grid;place-items:center;font-size:15px}
.bk-part li{display:grid;grid-template-columns:24px 1fr auto;gap:8px;padding:5px 0;border-top:1px solid #EEF0F8}
.bk-part .c{font-weight:800;color:#2B3A9A}.bk-part .t{color:var(--ink)}
.bk-toc .p{font-size:12px;font-weight:700;color:var(--muted);white-space:nowrap}
.bk-mt{margin-top:16px}
.bk-mt .btn{display:inline-flex;align-items:center;gap:8px}
/* who + law */
.bk-two{display:grid;grid-template-columns:1.2fr 1fr;gap:16px;align-items:start}
.bk-who h2{font-family:'Cabin',sans-serif;font-size:32px;color:var(--navy);margin:0 0 10px}
.bk-who .bk-ul{font-size:16px;color:var(--ink)}
.bk-who a{color:#2B3A9A;font-weight:700}
.bk-law{background:#1B2766;color:#fff;border-radius:20px;padding:20px 22px;border-top:6px solid #FDE68A}
.bk-law h3{display:flex;align-items:center;gap:8px;font-family:'Cabin',sans-serif;font-size:20px;margin:0 0 10px;color:#fff!important}
.bk-law dl{margin:0;display:grid;grid-template-columns:96px 1fr;gap:8px 12px;font-size:14px;line-height:1.5}
.bk-law dt{font-weight:800;color:#FDE68A}.bk-law dd{margin:0;color:#EEF0FF}.bk-law b{color:#fff!important}
/* lead form */
.bk-lead-in{display:grid;grid-template-columns:1fr 1.15fr;gap:22px;background:#fff;border:2px solid #DDE2F2;border-radius:24px;padding:26px;box-shadow:0 18px 40px -28px rgba(27,39,102,.5)}
.bk-lead h2{font-family:'Cabin',sans-serif;font-size:28px;color:var(--navy);margin:6px 0 8px}
.bk-lead-txt p{color:var(--muted);margin:0 0 10px}
.bk-form{display:flex;flex-direction:column;gap:12px;min-width:0}
.bk-f2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.bk-form label{display:flex;flex-direction:column;gap:5px;font-size:14px;font-weight:700;color:#1B2766;min-width:0}
.bk-form label small{font-weight:500;color:var(--muted)}
.bk-form input:not([type=checkbox]),.bk-form select{min-height:46px;border:2px solid #DDE2F2;border-radius:11px;padding:0 12px;font:500 16px 'Public Sans',sans-serif;color:var(--ink);background:#fff;width:100%;box-sizing:border-box}
.bk-form input:focus,.bk-form select:focus{outline:3px solid #9DB4FF;outline-offset:1px;border-color:#4A68EA}
.bk-form fieldset{border:0;margin:0;padding:0;min-width:0}
.bk-form legend{font-size:14px;font-weight:700;color:#1B2766;margin:0 0 6px;padding:0}
.bk-chks{display:flex;flex-wrap:wrap;gap:8px}
.bk-form .bk-chk{flex-direction:row;align-items:center;gap:8px;border:2px solid #DDE2F2;border-radius:11px;padding:8px 12px;min-height:44px;font-weight:600;cursor:pointer}
.bk-form .bk-chk:has(input:checked){border-color:#2B3A9A;background:#EEF1FF}
.bk-form input[type=checkbox]{width:20px;height:20px;accent-color:#2B3A9A;flex:none;margin:0}
.bk-form .bk-consent{flex-direction:row;align-items:flex-start;gap:10px;font-weight:500;font-size:13px;color:var(--muted);line-height:1.5}
.bk-consent a{color:#2B3A9A;font-weight:700}
.bk-form .btn{align-self:flex-start}
.bk-msg{margin:0;padding:10px 12px;border-radius:10px;font-weight:700;font-size:14px}
.bk-msg.ok{background:#DCFCE7;color:#166534}.bk-msg.err{background:#FEE2E2;color:#991B1B}
.books .hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
/* pairs */
.bk-pair2{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
.bk-pairbook{display:flex;gap:14px;align-items:center;background:#fff;border:2px solid #DDE2F2;border-radius:18px;padding:14px;text-decoration:none;color:inherit;transition:border-color .15s,transform .15s;min-width:0}
.bk-pairbook:hover{border-color:#4A68EA;transform:translateY(-2px)}
.bk-pairbook>img{width:70px;height:auto;flex:none;border-radius:2px 6px 6px 2px;box-shadow:0 10px 18px -8px rgba(27,39,102,.5)}
.bk-pairbook b{display:block;font-family:'Cabin',sans-serif;font-size:17px;color:var(--navy);line-height:1.25}
.bk-pairbook span{display:block;font-size:14px;color:var(--muted);margin-top:3px}
.bk-pairbook em{display:block;font-style:normal;font-weight:800;font-size:14px;color:#2B3A9A;margin-top:6px}
.bk-pi{flex:none;width:70px;height:70px;border-radius:16px;background:#EEF1FF;color:#2B3A9A;display:grid!important;place-items:center;margin:0!important}
.bk-stack{position:relative;flex:none;width:96px;height:110px;display:block!important;margin:0!important}
.bk-stack img{position:absolute;width:62px;height:auto;border-radius:2px 5px 5px 2px;box-shadow:0 8px 16px -6px rgba(27,39,102,.55)}
.bk-stack img:first-child{left:0;top:10px;transform:rotate(-6deg)}.bk-stack img:last-child{left:32px;top:0;transform:rotate(5deg)}
.bk-pairbar{display:flex;align-items:center;gap:14px;background:#FFF7E0;border:2px solid #F4D77A;border-radius:16px;padding:10px 16px;margin:0 0 30px;text-decoration:none;color:#1B2766}
.bk-pairbar img{flex:none;border-radius:2px 5px 5px 2px;box-shadow:0 6px 12px -6px rgba(0,0,0,.5)}
.bk-pairbar span{flex:1;font-size:15px;min-width:0}.bk-pairbar b{display:block;font-family:'Cabin',sans-serif;font-size:18px}
.bk-pairbar em{font-style:normal;font-weight:800;color:#D61F1F;white-space:nowrap}
.bk-disc{display:flex;gap:8px;align-items:flex-start;margin:10px 0 0;font-size:13px;color:var(--muted)}
.bk-disc svg{flex:none;margin-top:1px}
/* books home v2: cover stack, cards, system strip */
.bk-covers{position:relative;flex:0 0 auto;width:min(380px,80vw);height:360px;perspective:1100px}
.bk-covers .bk-book{position:absolute;width:210px;top:10px}
.bk-covers .b2{left:20px;transform:rotateY(-24deg) rotateZ(-4deg)}
.bk-covers .b1{left:150px;top:30px;transform:rotateY(-24deg) rotateZ(3deg)}
.bk-covers .bk-shadow{position:absolute;bottom:0;left:15%;width:70%}
.bk-grid2{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
.bk-card2{display:grid;grid-template-columns:96px 1fr;gap:14px;background:#fff;border:2px solid #DDE2F2;border-radius:18px;padding:16px;position:relative;transition:border-color .15s,box-shadow .15s,transform .15s;min-width:0}
.bk-card2:hover{border-color:#4A68EA;transform:translateY(-2px);box-shadow:0 12px 26px rgba(40,56,136,.16)}
.bk-card2 .th{width:96px;height:auto;border-radius:3px 7px 7px 3px;box-shadow:0 10px 20px -8px rgba(27,39,102,.5)}
.bk-card2 .bk-stack{width:96px;height:120px}
.bk-cb{min-width:0;display:flex;flex-direction:column;gap:5px}
.bk-cb .cd{display:inline-block;background:linear-gradient(135deg,#1F3496,#4A68EA);color:#fff;border-radius:9px;padding:3px 9px;font-weight:800;font-size:12px}
.bk-cb .st{display:inline-block;margin-left:6px;font-size:12px;font-weight:800;letter-spacing:.08em;border-radius:999px;padding:3px 9px;background:#2B3A9A;color:#fff;text-transform:uppercase}
.bk-cb .st.new{background:#D61F1F}.bk-cb .st.save{background:#047857}
.bk-cb h4{font-family:'Cabin',sans-serif;font-size:18px;line-height:1.25;margin:2px 0 0}
.bk-cb h4 a{color:var(--navy);text-decoration:none}.bk-cb h4 a:hover{text-decoration:underline}
.bk-win{display:flex;align-items:center;gap:6px;margin:0;font-size:13px;font-weight:800;color:#D61F1F}
.bk-ed{margin:0;font-size:13px;color:var(--muted)}
.bk-chips{list-style:none;margin:2px 0;padding:0;display:flex;flex-wrap:wrap;gap:5px}
.bk-chips li{font-size:12px;font-weight:700;border:1.5px solid #C9D2F5;color:#2B3A9A;border-radius:999px;padding:2px 9px;background:#F4F6FF}
.bk-cf{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:6px;margin-top:4px}
.bk-from{font-size:14px;color:var(--muted)}.bk-from b{font-family:'Cabin',sans-serif;font-size:18px;color:var(--navy)}
.bk-lookbtn,.bk-looks button{display:inline-flex;align-items:center;gap:5px;border:0;background:none;padding:6px 0;min-height:32px;font:800 14px 'Public Sans',sans-serif;color:#D61F1F;cursor:pointer}
.bk-looks{font-size:13px;color:var(--muted)}.bk-looks button{padding:4px 2px;font-size:13px}
.bk-lookbtn:hover,.bk-looks button:hover{text-decoration:underline}
.bk-view{font-weight:800;font-size:14px;color:#2B3A9A;text-decoration:none}
.bk-sys{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;background:#1B2766;color:#fff;border-radius:20px;padding:16px 20px;margin:0 0 30px}
.bk-sys ol{list-style:none;margin:0;padding:0;display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.bk-sys li{display:flex;align-items:center;gap:8px}
.bk-sys li b{color:#FDE68A!important;font-size:15px}.bk-sys li span{color:#EEF0FF;font-size:14px}
.bk-sys li.ar{color:#9DB4FF}
.bk-sys a{color:#fff!important;font-weight:800}
button.bk-ghost{cursor:pointer;font:inherit;font-weight:800}
@media (max-width:1100px){.bk-grid2{grid-template-columns:1fr 1fr}.bk-pair2{grid-template-columns:1fr 1fr}}
@media (max-width:900px){.bk-flow{grid-template-columns:1fr}.bk-flow .ar{transform:rotate(90deg);height:28px}.bk-toc{grid-template-columns:1fr}.bk-two,.bk-lead-in{grid-template-columns:1fr}.bk-gal{flex:1 1 100%}.bk-gmain{aspect-ratio:auto;max-height:520px}.bk-gmain img{max-height:480px}}
@media (max-width:640px){
 .bk-grid2,.bk-pair2,.bk-parts,.bk-f2{grid-template-columns:1fr}
 .bk-seg button{font-size:13px;padding:6px 4px}
 .bk-buy{padding:14px}
 .bk-conn-in,.bk-lead-in{padding:18px}
 .bk-conn h2,.bk-who h2{font-size:26px}
 .bk-covers{height:280px}.bk-covers .bk-book{width:160px}.bk-covers .b1{left:120px}
 .bk-pairbar{flex-wrap:wrap}.bk-pairbar em{width:100%}
 .bk-sys{flex-direction:column;align-items:flex-start}
 .bk-law dl{grid-template-columns:1fr}.bk-law dt{margin-top:4px}
 .bk-hookline li{font-size:13px}
}
@media print{.bk-gal,.bk-gthumbs{display:none!important}}
.books p.sub{text-transform:none;letter-spacing:0;font-weight:500;font-size:16px;color:var(--muted);margin:0 0 18px}
.bk-phero .bk-hookline{flex-basis:100%;margin:0 0 -26px}
@media (max-width:640px){.bk-phero .bk-hookline{margin:0 0 -8px}}