/* The same seven covers, hierarchy and card treatment form one learning library. */
.bt-library{box-sizing:border-box;width:min(1280px,calc(100% - 96px));margin:64px auto;color:#193a35;scroll-margin-top:110px}
.bt-library *{box-sizing:border-box}
.bt-library-head{display:flex;align-items:end;justify-content:space-between;gap:24px;margin:0 0 34px}
.bt-library-head h2{font-size:clamp(32px,4vw,52px);font-weight:500;letter-spacing:-.035em;line-height:1.08;margin:0}
.bt-library-head p{max-width:360px;margin:0;font-size:17px;line-height:1.6}
.bt-library .bt-edu-kicker{margin-bottom:10px}
.bt-library-group{margin:0 0 36px}
.bt-library-group h3{display:flex;align-items:center;gap:12px;font-size:17px;font-weight:600;margin:0 0 17px;letter-spacing:0}
.bt-library-group h3>span{display:inline-flex;align-items:center;justify-content:center;width:28px;height:28px;border:1px solid #193a3540;border-radius:50%;font-size:12px}
.bt-library-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.bt-library-card{display:flex;flex-direction:column;color:inherit;text-decoration:none;border:1px solid #193a352b;border-radius:18px;overflow:hidden;background:#faf9f5;transition:box-shadow .15s,transform .15s}
.bt-library-card:hover{box-shadow:0 12px 28px #193a3510;transform:translateY(-3px)}
.bt-library-card:focus-visible{outline:3px solid #985330;outline-offset:5px}
.bt-library-cover{display:block;position:relative;background:#f3f2ec;border-bottom:1px solid #193a351a;aspect-ratio:1.25}
.bt-library-cover img{display:block;width:100%;height:100%;object-fit:contain;mix-blend-mode:multiply}
.bt-library-number{position:absolute;top:17px;left:17px;display:flex;align-items:center;justify-content:center;width:32px;height:32px;border-radius:50%;background:#fffdf7;color:#193a35;border:1px solid #193a352b;font-size:12px;font-weight:700}
.bt-library-copy{display:flex;flex-direction:column;flex:1;padding:22px 23px 18px}
.bt-library-format{font-size:11px;letter-spacing:.07em;text-transform:uppercase;font-weight:600;color:#49615a;margin:0 0 10px;line-height:1.5}
.bt-library-copy h4{font-size:24px;line-height:1.13;letter-spacing:-.025em;font-weight:500;margin:0 0 10px}
.bt-library-description{font-size:14px;line-height:1.55;color:#49615a;margin:0 0 15px}
.bt-library-open{display:flex;justify-content:space-between;align-items:center;gap:12px;min-height:44px;padding-top:9px;border-top:1px solid #193a351c;margin-top:auto;font-size:13px;font-weight:600}
.bt-library-card:hover .bt-library-open{text-decoration:underline;text-underline-offset:4px}
@media(max-width:900px){.bt-library-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.bt-library{width:calc(100% - 40px);margin:42px auto}.bt-library-head{align-items:start;flex-direction:column;gap:15px}.bt-library-head p{max-width:570px}}
@media(max-width:560px){.bt-library-grid{grid-template-columns:1fr}.bt-library-head h2{font-size:36px}.bt-library-head p{font-size:16px}.bt-library-copy{padding:21px}.bt-library-copy h4{font-size:26px}.bt-library-group h3{font-size:16px}.bt-library-cover{aspect-ratio:1.3}}
@media(prefers-reduced-motion:reduce){.bt-library-card{transition:none}.bt-library-card:hover{transform:none}}