.sidebar{background:linear-gradient(180deg,#c7deed,#a9cadd);color:#173b5f;border-right:1px solid #9dbfd3}.brand-logo{display:block;margin:4px 2px 30px;padding:4px 0;background:transparent;border-radius:0;box-shadow:none}.brand-logo img{display:block;width:100%;height:auto;max-height:105px;object-fit:contain}.nav a{color:#244d70;font-weight:600}.nav a:hover,.nav a.active{background:rgba(255,255,255,.58);color:#102f4b}.letter-logo-image{display:block;width:310px;max-width:55%;height:auto;object-fit:contain}.login-wrap{background:linear-gradient(135deg,#d8eaf4,#8ebbd3)}.login-logo{display:block;width:min(320px,90%);height:auto;margin:0 auto 18px}.login-card{text-align:left}.login-card>p{text-align:center}.login-card .btn{background:#173b5f}@media(max-width:560px){.letter-head{align-items:flex-start;gap:18px;flex-direction:column}.letter-logo-image{max-width:78%;width:280px}.letter-number{text-align:left}}@media print{.letter-logo-image{width:280px;max-width:52%}}