.bt-mail-rel{background:#fff;border:1px solid #dce8f1;border-radius:24px;padding:clamp(22px,3.2vw,38px);margin:20px 0;box-shadow:0 10px 36px rgba(20,55,83,.045)}.bt-mail-rel__eyebrow{font-size:.7rem;letter-spacing:.16em;color:#3476a6;font-weight:750;margin:0 0 10px}.bt-mail-rel__head h2{font-size:clamp(1.35rem,2.5vw,1.9rem);letter-spacing:-.025em;color:#183b57;margin:0 0 8px}.bt-mail-rel__head>p:last-child{color:#5b7286;line-height:1.6;max-width:790px;margin:0 0 24px}.bt-mail-rel__grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}.bt-mail-rel__card{border:1px solid #e0eaf2;background:linear-gradient(150deg,#fff,#f7fafc);border-radius:17px;padding:19px;min-width:0;display:flex;flex-direction:column;transition:border-color .2s,transform .2s,box-shadow .2s}.bt-mail-rel__card:hover{border-color:#a7cbe2;transform:translateY(-2px);box-shadow:0 8px 20px rgba(23,65,98,.06)}.bt-mail-rel__number{font-size:.73rem;letter-spacing:.09em;font-weight:750;color:#6d93ad}.bt-mail-rel__card h3{color:#1b547c;font-size:1.22rem;margin:9px 0 7px}.bt-mail-rel__card p{font-size:.86rem;line-height:1.55;color:#586f82;flex:1;margin:0 0 17px}.bt-mail-rel__card strong{font-size:.83rem;color:#234d68;margin-bottom:13px}.bt-mail-rel__card a{font-size:.81rem;color:#17689d;text-decoration:none;font-weight:700}.bt-mail-rel__card a:hover{text-decoration:underline}.bt-mail-rel__card--message{background:linear-gradient(150deg,#f5faff,#fff)}.bt-mail-rel__note{font-size:.8rem;line-height:1.6;color:#64798a;margin:17px 0 0}.bt-mail-rel__note strong{color:#244b68}@media(max-width:900px){.bt-mail-rel__grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:540px){.bt-mail-rel__grid{grid-template-columns:1fr}.bt-mail-rel__card{padding:16px}}@media(prefers-reduced-motion:reduce){.bt-mail-rel__card{transition:none}.bt-mail-rel__card:hover{transform:none}}