/* Equal form columns retain their positions when trim and binding change. */
.bn-tool-page #spine-tool .spine-fields{display:grid!important;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px;max-width:700px;margin:0 auto 18px!important;align-items:start}
.bn-tool-page #spine-tool .spine-field-column{display:flex;flex-direction:column;gap:14px;min-width:0;width:100%}
.bn-tool-page #spine-tool .spine-field-column>.mainopt{float:none!important;display:block;width:100%!important;min-width:0;max-width:none;margin:0!important;padding:0!important;box-sizing:border-box}
.bn-tool-page #spine-tool .spine-fields .spine-field-column>.mainopt[hidden]{display:none!important}
.bn-tool-page #spine-tool .spine-fields label{display:block;margin:0 0 5px;line-height:1.35}
.bn-tool-page #spine-tool .spine-fields .mainopt>input,.bn-tool-page #spine-tool .spine-fields .mainopt>select{display:block;box-sizing:border-box;width:100%!important;max-width:none!important;margin:0!important;height:44px;min-height:44px;padding:8px 12px}
.bn-tool-page #spine-tool .spine-fields .mainopt>select{padding-right:32px}
.bn-tool-page #spine-tool #spine-ppi-hint{display:block;margin-top:5px;font-size:12px;line-height:1.3;color:#777}
.bn-tool-page #spine-tool .spine-custom-inputs{display:grid;grid-template-columns:minmax(0,1fr) auto minmax(0,1fr) minmax(0,1.3fr);align-items:center;gap:6px}
.bn-tool-page #spine-tool .spine-custom-inputs input,.bn-tool-page #spine-tool .spine-custom-inputs select{box-sizing:border-box;width:100%!important;min-width:0;height:44px;padding:8px}
.bn-tool-page #spine-tool #spine-to-full{display:block;margin:0 auto 10px!important;background:#cb3340;color:white;border:1px solid #cb3340;min-height:44px;padding:10px 24px}
.bn-tool-page #spine-tool button:disabled,.bn-tool-page #spine-tool button:disabled:hover{background:#e5e5e5!important;border-color:#d2d2d2!important;color:#888!important;cursor:not-allowed}
.bn-tool-page #spine-tool #spine-error{display:block!important;margin:0 0 8px!important;line-height:1.3;text-align:center}
.bn-tool-page #spine-tool #spine-error:empty{display:none!important}
.bn-tool-page #spine-tool #spine-format-switch{text-align:center}
.bn-tool-page #spine-tool .spine-format-segments{display:flex;justify-content:center;align-items:center;gap:24px;margin:0 auto 8px;max-width:100%}
.bn-tool-page #spine-tool .spine-format-segments label{display:inline-flex;align-items:center;gap:7px;min-height:36px;margin:0;color:#555;font:16px/1.3 AvenirMed,Arial,sans-serif;cursor:pointer}
.bn-tool-page #spine-tool .spine-format-segments input{appearance:none!important;accent-color:#24272b;width:16px!important;height:16px!important;min-height:0!important;margin:0!important;padding:0!important;border:1px solid #777!important;border-radius:50%!important;background:#fff!important;box-shadow:none}
.bn-tool-page #spine-tool .spine-format-segments input:checked{background:#24272b!important;box-shadow:inset 0 0 0 3px #fff!important}
.bn-tool-page #spine-tool .spine-format-segments label:has(input:checked){color:#24272b}
.bn-tool-page #spine-tool .spine-format-segments label:has(input:disabled){color:#999;cursor:not-allowed}
.bn-tool-page #spine-tool button:focus-visible,.bn-tool-page #spine-tool .spine-format-segments input:focus-visible{outline:2px solid #172d45;outline-offset:3px}
.bn-tool-page #spine-tool #spine-hardcover-reason:empty{display:none}
.bn-tool-page #spine-tool #spine-pdf,.bn-tool-page #spine-tool #spine-png{min-width:90px;min-height:44px;padding:9px 22px;border:1px solid #cb3340}
.bn-tool-page #spine-tool #spine-pdf{background:#cb3340;color:#fff}
.bn-tool-page #spine-tool #spine-png{background:transparent;color:#cb3340}
/* A measurement is one column: label, inches, millimetres. */
.bn-tool-page .spine-formulas{margin:24px 0;color:#24272b}
.bn-tool-page .spine-formula-group{display:flex;flex-wrap:wrap;justify-content:center;align-items:flex-start;gap:10px;margin:0 0 24px;font-variant-numeric:tabular-nums}
.bn-tool-page .spine-formula-part{display:flex;align-items:flex-start;gap:10px;white-space:nowrap}
.bn-tool-page .spine-formula-number{display:flex;flex-direction:column;text-align:center}
.bn-tool-page .spine-formula-label{font:13px/20px AvenirReg,Arial,sans-serif;color:#555}
.bn-tool-page .spine-formula-number strong{font:700 27px/38px PlayfairSmBold,Georgia,serif;color:#24272b}
.bn-tool-page .spine-formula-mm{font:13px/20px AvenirReg,Arial,sans-serif;color:#777}
.bn-tool-page .spine-formula-prefix{padding-top:20px;font:500 23px/38px PlayfairSmBold,Georgia,serif;white-space:nowrap;color:#24272b}
.bn-tool-page .spine-formula-op{padding-top:20px;font:500 26px/38px PlayfairSmBold,Georgia,serif;color:#555}
.bn-tool-page .spine-formula-note{color:#777;font-size:12px;text-align:center}
@media(max-width:767px){
 .bn-tool-page #spine-tool .spine-fields{grid-template-columns:minmax(0,1fr);gap:14px;max-width:420px}
 .bn-tool-page #spine-tool .spine-format-segments{gap:20px}
 .bn-tool-page .spine-formula-group{gap:10px 8px}
 .bn-tool-page .spine-formula-part{gap:8px}
 .bn-tool-page .spine-formula-number strong{font-size:26px}
}

/* r7: four half-width fields; the card is the only horizontal inset. */
.bn-tool-page #spine-tool .spine-fields{max-width:none!important;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px 24px;margin:0 0 18px!important}
.bn-tool-page #spine-tool .spine-fields>.mainopt{float:none;width:100%;min-width:0;margin:0!important;padding:0!important}
.bn-tool-page #spine-tool #spine-results{min-height:164px;transition:opacity .25s ease}
.bn-tool-page #spine-tool #spine-results[data-ready=false]{opacity:.42}
.bn-tool-page #spine-tool #spine-error{display:block!important;min-height:22px;height:22px;overflow:auto;font-size:12px;margin:0!important}
.bn-tool-page #spine-tool #spine-hardcover-reason{display:block!important;min-height:20px;font-size:12px}
.bn-tool-page #spine-tool #spine-text{display:block!important;min-height:20px}
.bn-tool-page #spine-tool .spine-reveal{display:grid;grid-template-rows:0fr;opacity:0;transition:grid-template-rows .25s ease,opacity .25s ease}
.bn-tool-page #spine-tool .spine-reveal.is-open{grid-template-rows:1fr;opacity:1}
.spine-reveal-inner{overflow:hidden;min-height:0}
.bn-tool-page #spine-tool #spine-cover-result[aria-disabled=true]{opacity:.4}
.bn-tool-page #spine-tool .spine-download{display:block;text-align:center;margin:24px 0 12px}
.spine-download>strong{display:block;margin-bottom:10px}
.spine-legend{display:grid;gap:8px;font-size:13px;line-height:1.5;margin:16px 0}
.spine-legend>div{display:flex;align-items:baseline;gap:9px}
.spine-legend i{display:inline-block;flex:0 0 15px;height:15px;border:1px solid #ccc;align-self:center}
.spine-legend i.spine-dashed{border:1px dashed #cb3340}
.spine-guide-origin{display:block;color:#777;font-size:12px;font-weight:normal}
@media(max-width:767px){
 .bn-tool-page #spine-tool .spine-fields{grid-template-columns:1fr}
 .bn-tool-page .spine-formula-group{display:flex;flex-direction:column;align-items:stretch;width:100%;max-width:330px;margin:0 auto 24px;gap:4px}
 .bn-tool-page .spine-formula-prefix{padding:0;text-align:center;font-size:21px;line-height:32px}
 .bn-tool-page .spine-formula-part{display:grid;grid-template-columns:18px minmax(0,1fr);align-items:center;gap:8px}
 .bn-tool-page .spine-formula-part:first-of-type:before{content:'+'}
 .bn-tool-page .spine-formula-op{padding:0;font:18px/30px AvenirReg,Arial,sans-serif}
 .bn-tool-page .spine-formula-part:nth-child(2){padding-left:26px;display:block}
 .bn-tool-page .spine-formula-number{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:baseline;gap:0 8px;text-align:right}
 .bn-tool-page .spine-formula-label{grid-column:1;grid-row:1 / 3;text-align:left;line-height:1.35}
 .bn-tool-page .spine-formula-number strong{font:700 22px/30px PlayfairSmBold,Georgia,serif}
 .bn-tool-page .spine-formula-mm{grid-column:2;font-size:12px;line-height:18px}
 .bn-tool-page .spine-formula-part:last-child{border-top:1px solid #ccc;margin-top:6px;padding-top:6px}
}

.spine-reveal:not(.is-open){visibility:hidden}
.spine-reveal.is-open{visibility:visible}
/* r8: keep every validation and result slot in place while typing. */
.bn-tool-page #spine-tool #spine-error:empty{display:block!important}
.bn-tool-page #spine-tool #spine-page-range{font:12px/1.35 AvenirReg,Arial,sans-serif;color:rgba(0,0,0,.6);white-space:nowrap}
.bn-tool-page #spine-tool .spine-page-invalid label,.bn-tool-page #spine-tool .spine-page-invalid #spine-page-range{color:#cb3340}
.bn-tool-page #spine-tool #spine-pages[aria-invalid=true]{border:1px solid #cb3340!important}
.bn-tool-page #spine-tool .spine-cover-cta{display:flex;align-items:center;justify-content:space-between;gap:18px;margin:16px 0}
.bn-tool-page #spine-tool .spine-cover-cta p{margin:0!important;font-size:14px;line-height:1.5}
.bn-tool-page #spine-tool #spine-to-full{flex:0 0 auto;display:inline-block;min-width:188px;margin:0!important;padding:10px 14px;font-size:14px;line-height:22px}
.bn-tool-page #spine-tool #spine-to-full:disabled,.bn-tool-page #spine-tool #spine-to-full:disabled:hover{background:transparent!important;border-color:#b9a8aa!important;color:#8c686c!important}
.bn-tool-page #spine-tool #spine-results{min-height:164px}
.bn-tool-page #spine-tool .spine-numbers>div{min-height:97px}
.bn-tool-page #spine-tool .spine-numbers strong{min-height:42px;white-space:nowrap}
.bn-tool-page #spine-tool #spine-text{height:20px;overflow:hidden;margin:0!important}
.bn-tool-page #spine-tool #spine-export-status{min-height:20px;font-size:12px;margin:0!important}
.bn-tool-page #spine-tool .spine-template-note{text-align:center}
.bn-tool-page #spine-tool .spine-guides-heading{margin-top:30px!important}
.bn-tool-page #spine-tool #spine-copy{background:transparent;color:#cb3340;border:1px solid #cb3340;min-height:32px;min-width:104px;padding:5px 10px;font-size:12px;line-height:20px}
.bn-tool-page #spine-tool .spine-board-note{color:#666;padding-left:24px}
.bn-tool-page #spine-tool #spine-diagram{aspect-ratio:1.44;display:grid;align-items:center}
.bn-tool-page #spine-tool #spine-diagram>div{width:100%;height:100%;min-height:0}
.bn-tool-page #spine-tool #spine-diagram svg{display:block;width:100%;height:100%}
@media(max-width:767px){
 .bn-tool-page #spine-tool .spine-cover-cta{align-items:stretch;flex-direction:column;gap:12px}
 .bn-tool-page #spine-tool #spine-to-full{align-self:flex-end}
 .bn-tool-page #spine-tool #spine-details>div{display:grid;gap:5px;line-height:1.45}
 .bn-tool-page #spine-tool #spine-details>div>span{display:block}
 .bn-tool-page #spine-tool #spine-diagram{aspect-ratio:1.25}
 .bn-tool-page #spine-tool .spine-numbers strong{min-height:42px}
}

.bn-tool-page #spine-tool .spine-numbers+p[data-spine-kdp][hidden]{display:block!important;visibility:hidden}

.bn-tool-page #spine-tool #spine-hardcover-reason{height:20px;overflow:hidden;white-space:nowrap;text-overflow:ellipsis}
.bn-tool-page #spine-tool .spine-formula-note{height:36px;line-height:18px;margin:0!important;overflow:hidden}
.bn-tool-page #spine-tool #spine-details>div{min-height:44px;box-sizing:border-box}
.bn-tool-page #spine-tool .spine-guides li>strong{display:block;white-space:nowrap}
.bn-tool-page #spine-tool .spine-guides li>span{display:block;min-height:20px}
.bn-tool-page #spine-tool .spine-guide-origin{height:36px;line-height:18px;overflow:auto}
@media(max-width:767px){
 .bn-tool-page #spine-tool .spine-guides li>span{min-height:40px}
 .bn-tool-page #spine-tool .spine-guide-origin{height:54px}
 .bn-tool-page #spine-tool #spine-details>div{min-height:76px}
}

/* r9: compact, fixed result slots; only hardcover formula typography changes. */
.bn-tool-page #spine-tool .spine-fields{margin-bottom:6px!important}
.bn-tool-page #spine-tool #spine-results{margin-top:6px;min-height:0;margin-bottom:12px}
.bn-tool-page #spine-tool .spine-cover-cta{margin:8px 0 0}
.bn-tool-page #spine-tool #spine-copy{background:#222;color:#fff;border-color:#222}
@media(min-width:768px){
 .bn-tool-page .spine-hardcover-formula{flex-wrap:nowrap;gap:5px}
 .bn-tool-page .spine-hardcover-formula .spine-formula-part{gap:5px}
 .bn-tool-page .spine-hardcover-formula .spine-formula-number strong{font-size:21px;line-height:34px}
 .bn-tool-page .spine-hardcover-formula .spine-formula-label,.bn-tool-page .spine-hardcover-formula .spine-formula-mm{font-size:11px;line-height:18px}
 .bn-tool-page .spine-hardcover-formula .spine-formula-prefix,.bn-tool-page .spine-hardcover-formula .spine-formula-op{padding-top:18px;font-size:20px;line-height:34px}
}
@media(min-width:768px) and (max-width:991px){
 .bn-tool-page .spine-hardcover-formula,.bn-tool-page .spine-hardcover-formula .spine-formula-part{gap:3px}
 .bn-tool-page .spine-hardcover-formula .spine-formula-number strong{font-size:17px}
 .bn-tool-page .spine-hardcover-formula .spine-formula-label,.bn-tool-page .spine-hardcover-formula .spine-formula-mm{font-size:10px}
 .bn-tool-page .spine-hardcover-formula .spine-formula-prefix,.bn-tool-page .spine-hardcover-formula .spine-formula-op{font-size:18px}
}

/* r10: toggle shares the note rows, above the design-service line. */
.bn-tool-page #spine-tool .spine-notes-row{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:12px;align-items:center}
.bn-tool-page #spine-tool .spine-notes p{display:block!important;height:20px;line-height:20px;font-size:12px;margin:0!important;overflow:hidden}
.bn-tool-page #spine-tool .spine-notes p[hidden]{visibility:hidden}
.bn-tool-page #spine-tool #spine-to-full{height:44px;min-height:44px;box-sizing:border-box}
.bn-tool-page #spine-tool .spine-cover-cta{display:block;margin-top:8px}
@media(max-width:767px){
 .bn-tool-page #spine-tool .spine-notes-row{gap:8px;grid-template-columns:minmax(0,1fr) 132px}
 .bn-tool-page #spine-tool #spine-to-full{min-width:0;width:132px;padding:5px 7px;font-size:12px;line-height:16px;height:44px}
 .bn-tool-page #spine-tool .spine-notes p{font-size:11px;line-height:16px;height:32px;white-space:normal}
}
.bn-tool-page #spine-tool #spine-to-full{align-self:center}
@media(max-width:767px){.bn-tool-page #spine-tool .spine-notes #spine-text{height:48px;min-height:48px}}

/* r12: intrinsic stacked variants reserve exactly the space their current width needs. */
.bn-tool-page #spine-tool .spine-result-columns{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;align-items:start}
.bn-tool-page #spine-tool .spine-result-number{min-width:0}
.bn-tool-page #spine-tool .spine-result-number h3{white-space:nowrap}
.bn-tool-page #spine-tool .spine-value-stack,.bn-tool-page #spine-tool .spine-text-stack{display:grid}
.bn-tool-page #spine-tool .spine-value-stack>*,.bn-tool-page #spine-tool .spine-text-stack>*{grid-area:1 / 1}
.bn-tool-page #spine-tool .spine-value-stack>strong{display:block;white-space:nowrap;color:#cb3340;font:32px/1.15 Playfair,Georgia,serif;min-height:42px}
.bn-tool-page #spine-tool .spine-value-stack>p{display:-webkit-box!important;-webkit-box-orient:vertical;-webkit-line-clamp:2;overflow:hidden;font:12px/20px AvenirReg,Arial,sans-serif;margin:0!important;height:auto!important;min-height:0!important;align-self:start}
.bn-tool-page #spine-tool .spine-reserve{visibility:hidden!important;pointer-events:none}
.bn-tool-page #spine-tool .spine-result-service{min-width:0}
.bn-tool-page #spine-tool #spine-to-full{align-self:start;width:100%;min-width:0;height:44px;padding:10px 14px;font-size:14px;line-height:22px;margin:0!important;white-space:nowrap;transform:translateY(var(--spine-button-offset,0px));transition:background-color .3s ease-out,border-color .3s ease-out,color .3s ease-out}
.bn-tool-page #spine-tool .spine-notes{margin-top:12px;text-align:center}
.bn-tool-page #spine-tool .spine-notes p,.bn-tool-page #spine-tool .spine-notes #spine-text{display:block!important;height:auto;min-height:0;margin:0!important;font-size:12px;line-height:20px;white-space:normal;overflow:visible}
.bn-tool-page #spine-tool .spine-notes p[hidden]{visibility:hidden}
.bn-tool-page #spine-tool #spine-format-switch{padding-top:12px}
.bn-tool-page #spine-tool #spine-hardcover-reason{display:none!important}
.bn-tool-page #spine-tool #spine-to-full:disabled{pointer-events:none}
.bn-tool-page #spine-tool .spine-needs-value{border-color:#cb3340!important;box-shadow:0 0 0 3px rgba(203,51,64,.18)!important}
.bn-tool-page #spine-tool label.spine-needs-value{color:#cb3340;box-shadow:none!important}
@keyframes analyzer-type-alert{0%,100%{transform:none}15%{transform:translateX(-7px)}30%{transform:translateX(6px)}45%{transform:translateX(-4px)}60%{transform:translateX(3px)}75%{transform:translateX(-1px)}}
.bn-tool-page #spine-tool .spine-shake{animation:analyzer-type-alert .5s ease}
.bn-tool-page #spine-tool .spine-guides-header{display:grid;grid-template-columns:minmax(0,1fr) auto;column-gap:20px;margin-top:30px;align-items:center}
.bn-tool-page #spine-tool .spine-guides-header .spine-guides-heading{grid-column:1;grid-row:1;margin:0!important}
.bn-tool-page #spine-tool .spine-guides-header>p{grid-column:1;grid-row:2;margin:0!important}
.bn-tool-page #spine-tool #spine-copy{grid-column:2;grid-row:1 / 3;display:grid;align-items:center;justify-items:center}
.bn-tool-page #spine-tool #spine-copy>span,.bn-tool-page #spine-tool #spine-copy:after{grid-area:1 / 1}
.bn-tool-page #spine-tool #spine-copy:after{content:'✓ Copied';visibility:hidden}
@media(max-width:991px){
 .bn-tool-page #spine-tool .spine-result-columns{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px 20px}
 .bn-tool-page #spine-tool .spine-result-service{grid-column:1 / -1}
 .bn-tool-page #spine-tool #spine-to-full{transform:none}
}
@media(max-width:600px){
 .bn-tool-page #spine-tool .spine-result-columns{grid-template-columns:minmax(0,1fr);gap:12px}
 .bn-tool-page #spine-tool .spine-guides-header{column-gap:12px}
 .bn-tool-page #spine-tool #spine-copy{grid-row:1}
 .bn-tool-page #spine-tool .spine-guides-header>p{grid-column:1 / -1}
 .bn-tool-page #spine-tool .spine-notes{margin-top:10px}
 .bn-tool-page #spine-tool #spine-format-switch{padding-top:10px}
}
@media(prefers-reduced-motion:reduce){.bn-tool-page #spine-tool .spine-shake{animation:none}}

/* r13 section 2: main-site .btn-default.btn5 appearance; r12 validation stays. */
.bn-tool-page #spine-tool #spine-to-full{display:inline-block;color:#fff;line-height:38px;padding:5px 25px;text-decoration:none;border-radius:3px;background:#cb3340;border:1px solid #cb3340;text-align:center;transition:background-color .3s ease-out,border-color .3s ease-out,color .3s ease-out;height:50px;min-height:50px;font-size:16px;font-family:AvenirReg,"sans-serif";font-weight:400;text-transform:uppercase}
.bn-tool-page #spine-tool #spine-to-full:hover{background:none;border:1px solid #cb3340;color:#cb3340}
/* Stack whole sentences so wrapping reserves the tallest complete variant. */
.bn-tool-page #spine-tool .spine-notes #spine-text{display:inline!important}
.bn-tool-page #spine-tool .spine-notes [data-spine-kdp][hidden]{display:none!important}
/* Retain the r12 narrow-screen inset where the main button's 25px cannot fit. */
@media(max-width:360px){.bn-tool-page #spine-tool #spine-to-full{padding-left:14px;padding-right:14px}}

/* Reserve the tallest printer form so the result action retains its document position. */
.bn-tool-page #spine-tool .spine-fields{align-content:start}