:root{--btb-navy:#10243d;--btb-blue:#234f78;--btb-gold:#b8914b;--btb-cream:#faf8f3;--btb-text:#172b43}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--btb-text);background:var(--btb-cream);font:16px/1.55 system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}a{color:inherit;text-decoration:none}.books-header{position:sticky;top:0;z-index:40;background:#fff;box-shadow:0 2px 16px #122b4514;display:flex;align-items:center;justify-content:space-between;gap:18px;padding:12px max(20px,calc((100% - 1140px)/2))}.books-header img{display:block;width:205px;max-width:43vw;height:auto}.books-header nav{display:flex;flex-wrap:wrap;gap:18px;font-size:.91rem;font-weight:650}.books-header nav a[aria-current=page]{color:var(--btb-blue)}.books-hero{background:linear-gradient(135deg,#10243d,#17365a 58%,#234f78);color:white;position:relative;overflow:hidden}.books-hero:before{content:"";position:absolute;width:600px;height:600px;right:-250px;top:-260px;border:1px solid #dec18e46;border-radius:50%}.books-hero-inner{position:relative;max-width:1140px;padding:78px 28px 65px;margin:auto}.books-eyebrow{font-size:.75rem;letter-spacing:.21em;font-weight:800;color:var(--btb-gold)}.books-hero .books-eyebrow{color:#e1bd83}.books-hero h1{font:700 clamp(2.45rem,6vw,5rem)/1.1 Georgia,"Times New Roman",serif;letter-spacing:-.025em;margin:22px 0}.books-hero em{color:#e7c88f;font-style:normal}.books-hero p{max-width:690px;color:#dbe5f0;font-size:1.14rem}.books-hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin:27px 0}.books-action{padding:13px 23px;border-radius:12px;font-weight:750;display:inline-flex;align-items:center;min-height:52px}.books-action.primary{background:#f1cf93;color:var(--btb-navy)}.books-action.secondary{border:1px solid #ffffff8a;background:#ffffff12;color:white}.books-hero .books-honest{color:#c8d6e4;font-size:.86rem;margin:16px 0 0}.books-section{max-width:1140px;margin:auto;padding:67px 26px}.books-section-head h2,.books-process h2{font:700 clamp(2rem,4vw,3rem)/1.15 Georgia,serif;margin:10px 0}.books-section-head>p{max-width:720px;color:#52657a;margin-bottom:27px}.books-catalog{display:grid;gap:26px}.books-book{display:grid;grid-template-columns:minmax(210px,330px) 1fr;gap:40px;padding:30px;background:#fff;border:1px solid #e4e7eb;border-radius:26px;box-shadow:0 10px 32px #0d294008}.books-book-cover{min-height:420px;aspect-ratio:2/3;background:linear-gradient(152deg,#10243d,#244b71 69%,#bb924c);border-radius:4px 14px 14px 4px;box-shadow:11px 17px 25px #08192b2a,inset 7px 0 4px #00000043;display:flex;flex-direction:column;justify-content:space-between;padding:29px 25px;position:relative;max-width:340px}.books-book-cover:after{content:"";position:absolute;inset:12px;border:1px solid #e5cc9e70;border-radius:1px 10px 10px 1px;pointer-events:none}.books-cover-brand{font-size:.78rem;letter-spacing:.17em;color:#f3e4ca;font-weight:750}.books-cover-title{font:700 clamp(1.8rem,3vw,2.55rem)/1.12 Georgia,serif;color:#fff;max-width:260px}.books-cover-sub{font-size:.87rem;color:#f3e4ca}.books-book-content{padding:10px 0;display:flex;flex-direction:column;justify-content:center}.books-book h3{font:700 clamp(1.9rem,3vw,2.7rem)/1.13 Georgia,serif;letter-spacing:-.02em;margin:10px 0 3px}.books-book h4{font-weight:600;color:#627386;margin:0 0 15px}.books-book p{line-height:1.65;color:#52657a}.books-book ul{margin:8px 0 18px;padding:0;list-style:none;display:grid;gap:9px}.books-book li{position:relative;padding-left:21px;font-size:.95rem}.books-book li:before{content:"✓";position:absolute;left:0;color:#2f795e;font-weight:800}.books-status{align-self:flex-start;background:#eef2f7;border:1px solid #d4dce7;color:#2d4969;border-radius:999px;padding:6px 14px;font-size:.78rem;font-weight:800}.books-meta{display:flex;flex-wrap:wrap;gap:10px;margin:8px 0 19px;font-size:.85rem;color:#576979}.books-meta span{background:#f5f7fa;border-radius:20px;padding:5px 12px}.books-unavailable{display:inline-block;background:#f0f1f3;border:1px solid #e4e6e9;border-radius:12px;padding:13px 21px;color:#68798c;font-weight:700;align-self:flex-start}.books-after{margin-top:28px;padding:22px 28px;border-radius:18px;background:#eef3f7;display:flex;justify-content:space-between;gap:23px;align-items:center}.books-after p{margin:0;max-width:710px}.books-after a{color:#184d7b;font-weight:800;white-space:nowrap}.books-process{padding:55px 28px 80px;background:#fff;text-align:center}.books-steps{max-width:1100px;margin:30px auto 0;display:grid;grid-template-columns:repeat(3,1fr);gap:19px;text-align:left}.books-steps>div{border:1px solid #e4e8ee;background:#fbfcfe;padding:25px;border-radius:18px}.books-steps span{font-weight:850;color:var(--btb-gold)}.books-steps h3{margin:8px 0;font-size:1.08rem}.books-steps p{margin:0;color:#66768a;font-size:.92rem}.books-footer{display:flex;flex-wrap:wrap;justify-content:space-between;gap:20px;padding:30px max(25px,calc((100% - 1100px)/2));background:var(--btb-navy);color:#d9e3ef;font-size:.84rem}.books-loading{padding:45px 25px;text-align:center;color:#607389}@media(max-width:760px){.books-header{padding:12px 16px}.books-header img{width:178px}.books-header nav{gap:11px;font-size:.75rem}.books-hero-inner{padding:54px 21px}.books-hero h1{font-size:2.7rem}.books-hero p{font-size:1rem}.books-section{padding:48px 18px}.books-book{grid-template-columns:1fr;padding:18px;gap:20px}.books-book-cover{width:min(100%,295px);min-height:375px;justify-self:center}.books-book-content{padding:0 3px 9px}.books-after{flex-direction:column;align-items:flex-start;padding:20px}.books-steps{grid-template-columns:1fr}.books-process{padding:46px 18px 65px}.books-footer{padding:24px 18px}}@media(max-width:420px){.books-header nav a:last-child{display:none}.books-hero h1{font-size:2.35rem}.books-action{width:100%;justify-content:center}}
.books-buy-form{display:grid;gap:11px;margin-top:18px;padding:20px;background:#f6f9fc;border:1px solid #dce3e9;border-radius:17px}
.books-buy-form label{display:grid;gap:5px;font-size:.85rem;font-weight:700}
.books-buy-form input{width:100%;min-width:0;padding:12px;border:1px solid #cad5e1;border-radius:9px;font:inherit;background:#fff}
.books-form-row{display:grid;grid-template-columns:2fr 1fr 1.3fr;gap:9px}
.books-buy-form .primary{border:0;background:#1e527a;color:#fff;justify-content:center;cursor:pointer;min-height:48px}
.books-buy-form button:disabled{opacity:.55;cursor:wait}
.books-checkout-message{margin:0!important;color:#164d71!important}
.books-buy-form small{color:#697e91}
.books-live-price{font-size:1.7rem;font-weight:850;color:#173e62!important;margin-bottom:4px!important}
.books-live-price span{font-weight:500;font-size:.82rem}
.books-myorders{border-top:1px solid #e5eaf0}
.books-myorders .order-btn{background:#183f65;color:white;border:0;cursor:pointer}
.books-myorders #books-order-message{color:#536981;margin:14px 0}
.books-order-card{background:#fff;border:1px solid #e1e7ef;border-radius:15px;padding:18px;margin:12px 0}
.books-order-card p{color:#62758a;margin:5px 0;overflow-wrap:anywhere}
@media(max-width:500px){.books-form-row{grid-template-columns:1fr 1fr}.books-form-row label:first-child{grid-column:1/-1}}

/* BTB BUSINESS BOOK SERIES — shared visual system for six preview-only volumes.
   The branded book surface is a website mockup, NOT a Lulu/KDP cover master. */
.books-book-cover {
  background: radial-gradient(circle at 90% 5%,#0865d9 0%,transparent 39%),linear-gradient(140deg,#031026 4%,#06326e 65%,#075de8 100%);
  border-radius:8px 16px 16px 8px;
  min-height:430px;
  justify-content:flex-start;
  gap:12px;
  isolation:isolate;
  overflow:hidden;
  box-shadow:9px 16px 28px #04152f38,inset 7px 0 6px #00102588;
}
.books-book-cover:after { inset:0; border:0; border-left:8px solid #03102377; border-radius:0; }
.books-book-cover::before { content:"";position:absolute;z-index:-1; width:158%; height:55%; left:-18%;bottom:-15%;transform:rotate(-27deg);background:linear-gradient(110deg,#0078f7,#f6fbff 47%,#049dff 54%,#002d88 92%);clip-path:polygon(0 100%,70% 12%,70% 0,100% 43%,70% 89%,70% 77%,0 100%);opacity:.93;}
.books-cover-logo{display:block;width:100%;max-height:43px;object-fit:contain;object-position:left center;filter:drop-shadow(0 1px 2px #001033);}
.books-cover-series{font-weight:800;letter-spacing:.19em;font-size:clamp(.54rem,.9vw,.68rem);color:#d7ecff;position:relative;z-index:1;}
.books-cover-title{font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif; font-size:clamp(2.1rem,3.1vw,2.55rem);line-height:1.04;letter-spacing:-.044em;position:relative;z-index:1;overflow-wrap:break-word;max-width:100%;text-shadow:0 2px 3px #02162b44;}
.books-cover-sub{font-size:.92rem;line-height:1.26;color:#f0f8ff;font-weight:730;position:relative;z-index:1;letter-spacing:0;}
.books-cover-benefits{display:flex;gap:10px;flex-wrap:wrap;position:relative;z-index:1;margin-top:6px;}
.books-cover-benefits span{font-size:.67rem;letter-spacing:.11em;color:#e6f8ff;font-weight:850;border:1px solid #3ec9ff77;padding:5px 8px;border-radius:30px;background:#05224cbd;}
.books-cover-arrow{position:absolute;right:-10px;bottom:-4px;width:44%;height:43%;opacity:.3;transform:rotate(-17deg);border-top:9px solid #bdeaff;border-right:9px solid #bdeaff;clip-path:polygon(30% 0,100% 0,100% 100%,65% 100%,65% 45%,30% 45%);}
@media(max-width:760px){
  .books-book-cover{min-height:390px;width:min(100%,310px);padding:26px 24px;}
  .books-cover-title{font-size:clamp(2.06rem,10vw,2.46rem)}
  .books-cover-benefits span{font-size:.63rem}
}

/* Three transparent format previews. Not a checkout or a price guarantee. */
.books-editions{margin:14px 0 20px;padding:16px;border-radius:16px;border:1px solid #d7e3ef;background:#f5f9fe}
.books-editions-head{display:flex;align-items:baseline;justify-content:space-between;flex-wrap:wrap;gap:5px 12px;margin-bottom:12px}
.books-editions-head strong{color:#163b5f;font-size:.96rem}
.books-editions-head small{color:#5f748a;font-size:.76rem}
.books-editions-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:9px}
.books-edition{display:flex;flex-direction:column;gap:3px;border:1px solid #d5e0ee;border-radius:12px;background:#fff;padding:12px;min-width:0}
.books-edition .books-edition-type{font-size:.74rem;font-weight:760;color:#355978}
.books-edition strong{font-size:1.27rem;color:#0d386a}
.books-edition small{color:#637386;font-size:.72rem;line-height:1.35}
@media(max-width:880px){.books-editions-grid{grid-template-columns:1fr}.books-edition{padding:12px 14px}.books-editions{padding:14px}}

/* Authentic chapter samples, linked to the public read-only reader. */
.books-read-sample{display:inline-flex;align-items:center;justify-content:center;gap:6px;align-self:flex-start;
  padding:11px 16px;margin:2px 0 14px;border:1px solid #b5d2ec;border-radius:10px;background:#edf6ff;
  color:#144e86;font-weight:800;text-decoration:none;transition:background .15s ease}
.books-read-sample:hover,.books-read-sample:focus-visible{background:#d8edff}
@media(max-width:760px){.books-read-sample{align-self:stretch;text-align:center}}

/* Public front-cover gallery: branded art, no third-party printer references.
   SVG files are conceptual front covers, NOT print-bleed or wraparound PDFs. */
.books-search-wrap{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:end;gap:7px 16px;background:#f4f8fd;border:1px solid #dce8f3;border-radius:17px;padding:17px 19px;margin:2px 0 23px}
.books-search-wrap label{grid-column:1/-1;font-size:13px;font-weight:850;color:#204971}
.books-search-wrap input{min-width:0;width:100%;padding:12px 15px;font:inherit;border:1px solid #b9cee4;border-radius:10px;background:#fff}
.books-search-wrap input:focus-visible{outline:3px solid #3e87db80;outline-offset:2px}
.books-search-wrap span{font-size:12px;color:#54728f;white-space:nowrap}
.books-book[hidden]{display:none!important}
.books-book-cover-art{padding:0;overflow:hidden;aspect-ratio:2/3;min-height:0;height:auto;display:block;position:relative;isolation:isolate;border-radius:7px 13px 13px 7px;background:#10243d;max-width:310px;width:100%;box-shadow:11px 17px 25px #08192b2a,inset 7px 0 4px #00000043}
.books-book-cover-art::before,.books-book-cover-art::after{display:none!important}
.books-book-cover-art img{width:100%;height:100%;aspect-ratio:2/3;display:block;object-fit:cover;transition:transform .28s ease}
.books-book-cover-art:hover img,.books-book-cover-art:focus-visible img{transform:scale(1.03)}
.books-cover-preview-note{position:absolute;left:8px;right:8px;bottom:7px;border-radius:7px;padding:6px 8px;background:#061323de;color:#f7fafc;text-align:center;font-weight:750;font-size:10px;line-height:1.35}
@media(max-width:760px){.books-book-cover-art{min-height:0;max-width:295px}.books-search-wrap{grid-template-columns:1fr}.books-search-wrap span{white-space:normal}}

/* BTB Book Series V3: readable premium illustrated editions, compact mobile cards. */
.books-hero{background:radial-gradient(ellipse at 75% 35%,#205c99 0,#17355b 44%,#081a31 88%)}
.books-hero:after{content:"";position:absolute;right:4%;top:8%;width:min(34vw,370px);height:min(34vw,370px);border:1px solid #eecf8c22;border-radius:50%;pointer-events:none}
.books-hero h1{max-width:800px;font-family:system-ui,-apple-system,"Segoe UI",sans-serif;font-weight:850;letter-spacing:-.052em;line-height:1.06}
.books-section-head h2,.books-process h2{font-family:system-ui,-apple-system,"Segoe UI",sans-serif;letter-spacing:-.045em;font-weight:820}
.books-catalog{grid-template-columns:repeat(2,minmax(0,1fr));gap:17px}
.books-book{grid-template-columns:minmax(105px,154px) minmax(0,1fr);gap:17px;padding:18px;border-radius:20px;align-items:start}
.books-book-cover-art{max-width:154px;min-width:0;justify-self:start;box-shadow:5px 12px 24px #0d24402b}
.books-book h3{font-family:system-ui,-apple-system,"Segoe UI",sans-serif;font-size:clamp(1.17rem,2vw,1.5rem);font-weight:830;line-height:1.16;letter-spacing:-.042em;margin:7px 0 4px}
.books-book h4{font-size:.85rem;margin-bottom:10px;line-height:1.35}
.books-book p{font-size:.84rem;line-height:1.5;margin:0 0 10px}
.books-book-content{padding:0;min-width:0}
.books-status{font-size:.64rem;line-height:1.3;padding:5px 9px}
.books-meta{font-size:.71rem;gap:5px;margin:6px 0 12px}
.books-meta span{padding:3px 7px}
.books-inside{margin:0 0 11px;border-top:1px solid #e5ebf3}
.books-inside summary{cursor:pointer;font-size:.78rem;color:#1c4c77;font-weight:800;padding:9px 0}
.books-inside ul{margin:4px 0 12px}
.books-inside li{font-size:.8rem;line-height:1.45}
.books-editions{margin:7px 0 10px;padding:12px;border-radius:12px}
.books-editions summary{cursor:pointer;list-style:revert}
.books-editions-head{font-size:.77rem;align-items:start;margin:0}
.books-editions-head strong{font-size:.8rem}
.books-editions-head small{font-size:.66rem}
.books-editions[open] .books-editions-head{margin-bottom:9px}
.books-editions-grid{grid-template-columns:1fr}
.books-edition{padding:9px 12px}
.books-edition strong{font-size:1rem}
.books-unavailable{font-size:.77rem;padding:9px 12px;align-self:flex-start}
.books-read-sample{font-size:.79rem;min-height:41px;margin-bottom:9px;padding:9px 11px}
.books-book-cover-art img{object-fit:cover}
.books-cover-preview-note{font-size:9px;padding:5px}
@media(max-width:990px){.books-catalog{grid-template-columns:1fr}.books-book{grid-template-columns:minmax(120px,180px) minmax(0,1fr)}.books-book-cover-art{max-width:180px}}
@media(max-width:760px){.books-hero-inner{padding:46px 21px}.books-catalog{gap:12px}.books-book{grid-template-columns:minmax(112px,135px) minmax(0,1fr);gap:12px;padding:13px;border-radius:16px}.books-book-cover-art{width:100%;max-width:135px;margin:0;min-height:0;height:auto}.books-book h3{font-size:clamp(1.05rem,4.6vw,1.3rem)}.books-book h4{font-size:.76rem}.books-book p{font-size:.77rem}.books-meta span{font-size:.68rem}.books-status{font-size:.6rem}.books-editions{padding:10px}.books-read-sample{align-self:stretch;text-align:center}.books-section{padding:42px 14px}}
@media(max-width:390px){.books-book{grid-template-columns:100px minmax(0,1fr)}.books-book-cover-art{max-width:100px}.books-book h3{font-size:1.07rem}}


/* BTB books: consistent cards without changing the book-cover artwork. */
.books-book{border-radius:12px;min-width:0;align-items:stretch}
.books-book-content{min-width:0}
.books-book h3{
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;
  overflow:hidden;line-height:1.16;min-width:0;
}
.books-editions-grid{align-items:stretch}
.books-edition{border-radius:12px;min-width:0;height:100%}
.books-edition-type{
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;
  overflow:hidden;min-height:2.5em;line-height:1.25;
}
.books-action,.books-read-sample,.books-unavailable{
  border-radius:12px;font-weight:700;
  transition:opacity .2s ease,background-color .2s ease,border-color .2s ease;
}
.books-action{padding:10px 16px;min-height:44px;justify-content:center}
.books-action:hover,.books-read-sample:hover{opacity:.9}
.books-section :is(a,button,input,select):focus-visible,
.books-hero :is(a,button):focus-visible{outline:3px solid #3978bb;outline-offset:3px}
@media(prefers-reduced-motion:reduce){
  .books-action,.books-read-sample,.books-unavailable{transition:none}
}

/* Books showroom: preserve each book's real 2:3 cover and individual artwork. */
.books-book{height:100%;min-width:0}
.books-book-content{display:flex;flex-direction:column;min-width:0}
.books-book h3,.books-hero h1{letter-spacing:-.035em;text-wrap:balance}
.books-book-cover-art,.books-book-cover-art img{aspect-ratio:2/3}
.books-book-cover-art{align-self:start}
.books-book .books-editions{min-width:0}
.books-book .books-action,.books-book .books-read-sample,.books-hero :is(a,button),.books-editions summary{
 min-height:44px;touch-action:manipulation;
}
.books-book .books-action,.books-book .books-read-sample{display:inline-flex;align-items:center;justify-content:center}
.books-book :is(a,button,summary):focus-visible{outline:3px solid #3273b5;outline-offset:3px}
.books-action,.books-read-sample{transition:transform .16s ease,background-color .2s ease,opacity .2s ease}
.books-action:active,.books-read-sample:active{transform:scale(.985)}
@media(prefers-reduced-motion:reduce){
 .books-action,.books-read-sample{transition:none}
 .books-action:active,.books-read-sample:active{transform:none}
}