/* Product-led backtesting composition. Shared brand controls, distinct page layout. */
.bt-page{--bt-ink:#172e38;--bt-line:#dce5e7}
.bt-page .pl-section{padding:76px 0}
.bt-hero{background:linear-gradient(180deg,#fff9f1 0%,#fff9f1 66%,#fff 66%);padding:44px 0 0}
.bt-hero-copy{text-align:center;max-width:860px;margin:auto}
.bt-page .bt-hero h1{font-size:clamp(44px,4.8vw,68px);line-height:1.08;letter-spacing:-2.5px}
.bt-hero h1 span{color:var(--pl-orange)}
.bt-hero-copy>p:not(.ed-kicker):not(.pl-access-note){max-width:690px;margin:24px auto 0;font-size:19px;line-height:1.65}
.bt-hero .pl-actions,.bt-start .pl-actions{justify-content:center}
.bt-workspace{max-width:960px;margin:40px auto 0;border:6px solid #20343e;border-radius:18px;background:#14232c;box-shadow:0 22px 55px -25px #18313b66;overflow:hidden}
.bt-window-bar{display:flex;justify-content:space-between;padding:12px 17px;color:#d5e1e8;font-size:12px;gap:16px}
.bt-window-bar span:last-child{font-size:10px;letter-spacing:1.5px}
.bt-window-bar i{display:inline-block;width:7px;height:7px;background:#ff840d;border-radius:50%;margin-right:8px}
.bt-screen{display:block;position:relative;border:0;padding:0;cursor:zoom-in;width:100%;overflow:hidden;background:#fff}
.bt-main-screen img{display:block;width:100%;height:520px;object-fit:contain;background:#070808}
.bt-zoom{position:absolute;bottom:14px;right:14px;border:1px solid #dce3e6;background:#fff;color:#273e4a;padding:8px 12px;border-radius:24px;font-size:12px;box-shadow:0 3px 18px #0001;transition:transform .2s}
.bt-capabilities{display:flex;justify-content:center;flex-wrap:wrap;gap:18px 34px;padding:28px 0;border-bottom:1px solid var(--bt-line);font-size:14px;color:#47616b}
.bt-decision-grid{display:grid;grid-template-columns:1fr 1fr;align-items:center;gap:70px}
.bt-decision-grid p+p{margin-top:18px}
.bt-page .bt-decision-grid p{font-size:17px}
.bt-heading{text-align:center;max-width:740px;margin:0 auto 32px}
.bt-heading>p:last-child:not(.ed-kicker){margin-top:16px;font-size:17px}
.bt-product{background:#edf3f4}
.bt-gallery{border:1px solid #d5e2e5;background:white;border-radius:20px;overflow:hidden}
.bt-gallery-nav{display:grid;grid-template-columns:repeat(3,1fr);border-bottom:1px solid #dde6e8}
.bt-gallery-nav button{position:relative;background:#f9fbfb;border:0;border-right:1px solid #dde6e8;padding:22px 15px;font-size:18px;color:#61747d;cursor:pointer;transition:background .2s}
.bt-gallery-nav button:last-child{border-right:0}
.bt-gallery-nav button span{font-size:13px;margin-right:10px;color:#7b8a8f}
.bt-gallery-nav button[aria-selected=true]{background:#fff5e9;color:#293b44}
.bt-gallery-nav button[aria-selected=true]:after{content:"";position:absolute;bottom:0;left:0;height:3px;width:100%;background:var(--pl-orange);transform-origin:left}
.bt-gallery.is-autoplay .bt-gallery-nav button[aria-selected=true]:after{transform:scaleX(var(--tour-progress,0))}
.bt-gallery-panel:not([hidden]){display:grid;grid-template-columns:.8fr 1.2fr;align-items:center;gap:36px;padding:36px;min-height:460px;animation:bt-appear .3s ease}
.bt-counter{font-size:12px;letter-spacing:2px;color:#97816a}
.bt-page .bt-gallery-copy h3{font-size:30px;line-height:1.2;margin:18px 0}
.bt-gallery-copy p{font-size:16px;line-height:1.65}
.bt-gallery-copy ul{list-style:none;padding:0;margin:22px 0 0;display:grid;gap:12px;font-size:14px;color:#45606b}
.bt-gallery-copy li:before{content:"✓";color:#f47500;margin-right:10px}
.bt-gallery-screen{border:1px solid #e0e7ea;border-radius:10px;background:#f6f8fa}
.bt-gallery-screen img{width:100%;height:380px;object-fit:contain;display:block}
.bt-gallery-footer{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:16px 28px;border-top:1px solid #e5ecee;color:#637580}
.bt-gallery-footer small{font-size:12px}
.bt-gallery-footer button{border:1px solid #ccd7db;border-radius:30px;background:white;padding:7px 13px;font-size:12px;color:#314953;cursor:pointer;flex-shrink:0}
.bt-tool-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:34px}
.bt-tool-grid article{border-top:1px solid #dae2e4;padding-top:24px}
.bt-tool-grid h3{margin:22px 0 12px}
.bt-tool-grid p{font-size:16px}
.bt-tool-visual{height:72px;display:flex;align-items:center;gap:10px}
.bt-tool-visual>span{background:#e8f2f6;color:#245878;border:1px solid #cfe0e8;border-radius:12px;padding:12px 20px;font-size:23px}
.bt-tool-visual>span:nth-child(2){background:#fff0df;color:#cf5c00;border-color:#ffdab1}
.bt-order-types>span{font-size:14px;padding:12px 15px}
.bt-risk-visual>span{font-size:14px;background:#e2f3ed;color:#28664d}
.bt-risk-visual i{height:3px;flex:1;background:linear-gradient(90deg,#69b49c,#ff9d54)}
.bt-practice{background:#fff6eb}
.bt-practice-layout{display:grid;grid-template-columns:.85fr 1.15fr;gap:75px;align-items:center}
.bt-mascot{text-align:center;max-width:370px;margin:auto}
.bt-mascot img{width:100%;height:auto}
.bt-mascot>span{display:inline-block;background:white;padding:10px 18px;border:1px solid #f2ddc7;border-radius:10px;transform:rotate(-3deg);font-size:14px}
.bt-practice h2{margin-bottom:20px}
.bt-practice p{font-size:17px}
.bt-prompts{margin-top:25px;border-top:1px solid #ead9c6}
.bt-prompts details{border-bottom:1px solid #ead9c6;padding:17px 0}
.bt-prompts summary{cursor:pointer;font-size:19px;font-weight:500;list-style:none}
.bt-prompts summary:after{content:"+";float:right;color:#b76625}
.bt-prompts details[open] summary:after{content:"−"}
.bt-prompts summary span{font-size:12px;color:#99683e;margin-right:15px}
.bt-prompts p{font-size:15px;margin:13px 28px 0}
.bt-connect{background:#172e38;color:#fff}
.bt-connect .ed-kicker{color:#ffbd86!important}
.bt-connect-grid{display:grid;grid-template-columns:1fr 1fr;gap:30px}
.bt-connect-grid a{display:block;border:1px solid #49606b;border-radius:16px;padding:27px 27px 0;overflow:hidden;color:white;transition:transform .2s,background .2s}
.bt-connect-grid a>span{font-size:11px;letter-spacing:1.3px;color:#ffc391}
.bt-connect-grid h3{margin:16px 0 12px}
.bt-connect-grid p{font-size:16px;color:#bdcdd4;max-width:400px}
.bt-connect-grid img{width:100%;height:235px;object-fit:cover;object-position:top;margin-top:26px;border-radius:8px 8px 0 0;display:block}
.bt-definition{background:#f6f8fa}
.bt-page .bt-scope-note{font-size:14px;color:#667580}
.bt-start{text-align:center;background:#fff3e3}
.bt-start h2{font-size:clamp(32px,3.6vw,48px)}
.bt-start p{max-width:560px;margin:22px auto 0;font-size:18px}
.bt-start small{display:block;margin-top:24px;font-size:13px;color:#72695f}
@keyframes bt-appear{from{opacity:.6;transform:translateY(5px)}to{opacity:1;transform:none}}
@media(hover:hover){.bt-screen:hover .bt-zoom{transform:translateY(-3px)}.bt-gallery-nav button:hover{background:#fff4e6}.bt-connect-grid a:hover{transform:translateY(-4px);background:#203e49}}
@media(max-width:900px){.bt-gallery-panel:not([hidden]){gap:24px;padding:26px;grid-template-columns:.85fr 1.15fr}.bt-gallery-screen img{height:340px}.bt-practice-layout,.bt-decision-grid{gap:35px}.bt-main-screen img{height:440px}.bt-tool-grid{gap:20px}.bt-tool-visual>span{padding:10px 13px}.bt-order-types>span{padding:10px;font-size:12px}}
@media(max-width:600px){.bt-page .pl-section{padding:48px 0}.bt-hero{padding-top:28px}.bt-page .bt-hero h1{font-size:41px;letter-spacing:-1.6px}.bt-hero-copy>p:not(.ed-kicker):not(.pl-access-note){font-size:17px}.bt-workspace{margin-top:30px;border-width:4px;border-radius:12px}.bt-window-bar{font-size:10px;padding:9px}.bt-window-bar span:last-child{display:none}.bt-main-screen img{height:auto}.bt-zoom{font-size:10px;padding:6px 10px;bottom:8px;right:8px}.bt-capabilities{display:grid;grid-template-columns:1fr 1fr;gap:15px;font-size:12px}.bt-decision-grid,.bt-practice-layout,.bt-tool-grid,.bt-connect-grid{grid-template-columns:1fr;gap:28px}.bt-gallery-nav button{font-size:13px;padding:15px 8px;line-height:1.4}.bt-gallery-nav button span{display:block;margin:0 0 5px}.bt-gallery-panel:not([hidden]){grid-template-columns:1fr;padding:22px;min-height:0;gap:24px}.bt-page .bt-gallery-copy h3{font-size:25px;margin:10px 0}.bt-gallery-copy ul{gap:8px;margin-top:15px}.bt-gallery-screen img{height:290px}.bt-gallery-footer{padding:12px 16px}.bt-gallery-footer small{font-size:10px}.bt-mascot{max-width:260px;order:2}.bt-connect-grid a{padding:22px 22px 0}.bt-connect-grid img{height:190px}.bt-tool-grid article{display:block}.bt-tool-visual{height:55px}.bt-practice h2 br{display:none}.bt-page .ed-subnav>div{gap:12px;flex-wrap:wrap;justify-content:flex-end}.bt-page .ed-subnav{font-size:12px}.bt-start .pl-actions{flex-direction:column}}
@media(prefers-reduced-motion:reduce){.bt-gallery-panel:not([hidden]){animation:none}.bt-connect-grid a:hover,.bt-screen:hover .bt-zoom{transform:none}}
.bt-page .bt-connect h2,.bt-page .bt-connect h3{color:#fff}
/* Readability and conversion pass: body copy stays comfortable at every width. */
.bt-page .bt-gallery-copy p,.bt-page .bt-tool-grid p,.bt-page .bt-connect-grid p,.bt-page .bt-prompts p{font-size:17px;line-height:1.7}
.bt-page .bt-gallery-copy ul{font-size:16px;line-height:1.5}
.bt-page .bt-scope-note{font-size:16px;line-height:1.65}
.bt-page .pl-access-note{font-size:16px!important;max-width:620px;margin-left:auto!important;margin-right:auto!important}
.bt-page .bt-capabilities{font-size:15px}
.bt-page .bt-gallery-footer small,.bt-page .bt-start>.pl-wrap>small{font-size:14px;line-height:1.6}
.bt-page .bt-gallery-footer button{font-size:14px;min-height:44px;padding:9px 16px}
.bt-page .bt-zoom{font-size:14px;line-height:1.4}
.bt-inline-cta{display:flex;align-items:center;justify-content:space-between;gap:30px;margin-top:30px;padding:26px 0 0}
.bt-inline-cta h3{margin:0 0 9px;font-size:23px}
.bt-inline-cta p{font-size:16px;max-width:570px}
.bt-inline-cta .pl-button{flex-shrink:0}
.bt-start-steps{display:grid;grid-template-columns:repeat(3,1fr);gap:25px;max-width:840px;padding:0;margin:34px auto;list-style:none;text-align:left}
.bt-start-steps li{display:grid;grid-template-columns:32px 1fr;gap:6px 12px;align-content:start}
.bt-start-steps li>span{grid-row:span 2;display:grid;place-items:center;width:32px;height:32px;border-radius:50%;background:#fff;color:#a74700;border:1px solid #f3d4b1;font-size:15px}
.bt-start-steps strong{font-size:17px;font-weight:500}
.bt-page .bt-start-steps small{margin:0;font-size:15px;line-height:1.6}
@media(max-width:900px){.bt-inline-cta{align-items:flex-start}.bt-inline-cta .pl-button{font-size:16px;padding:16px 22px}}
@media(max-width:600px){
 .bt-page .bt-hero h1{font-size:clamp(34px,9.5vw,46px)}
 .bt-page .bt-gallery-nav button{font-size:15px;min-height:80px}
 .bt-page .bt-capabilities{font-size:14px;line-height:1.5}
 .bt-page .bt-gallery-footer{align-items:center;gap:15px}
 .bt-page .bt-gallery-footer small{font-size:14px}
 .bt-page .bt-zoom{position:static;display:block;border:0;border-top:1px solid #dce3e6;border-radius:0;box-shadow:none;padding:12px;min-height:44px}
 .bt-page .bt-gallery-screen img{height:250px}
 .bt-page .bt-prompts summary{padding:6px 0;min-height:44px}
 .bt-page .bt-prompts p{margin-left:0;margin-right:0}
 .bt-inline-cta{flex-direction:column;gap:20px;padding-top:15px}
 .bt-inline-cta .pl-button{align-self:flex-start}
 .bt-start-steps{grid-template-columns:1fr;gap:20px;max-width:320px}
 .bt-page .ed-subnav>div{gap:6px 12px}
 .bt-page .ed-subnav a{display:inline-flex;align-items:center;min-height:44px}
 .bt-page .pl-questions details p{font-size:17px;line-height:1.7}
}