.iol-container{display:flex;flex-direction:column;align-items:center;padding:20px;font-family:Poppins,sans-serif;background:linear-gradient(180deg,#f8faff,#eef2f7);min-height:100vh}.iol-header{text-align:center;margin-bottom:10px}.iol-header h1{color:#1a2b4b;font-size:2.2rem;font-weight:600}.iol-header p{color:#64748b;font-size:1rem}.iol-card{background:#fff;padding:40px;border-radius:10px;box-shadow:0 20px 50px rgba(0,0,0,.04);width:100%;max-width:440px;border:1px solid #e2e8f0}.input-group{margin-bottom:24px;display:flex;flex-direction:column}.input-group label{font-weight:600;margin-bottom:8px;font-size:.9rem;color:#334155}.input-group input{padding:14px 16px;border-radius:12px;border:2px solid #f1f5f9;background:#f8fafc;font-size:1rem;transition:all .2s ease;color:#1e293b}.input-group input:focus{outline:none;border-color:#3b82f6;background:#fff;box-shadow:0 0 0 4px rgba(59,130,246,.1)}.input-err{border-color:#ef4444!important;background:#fff1f2!important}.err-msg{color:#ef4444;font-size:.8rem;margin-top:6px;font-weight:500}.calculate-btn{width:100%;padding:16px;background:#1e293b;color:#fff;border:none;border-radius:8px;cursor:pointer;font-weight:500;font-size:1rem;margin-top:10px;transition:all .3s ease;font-family:Poppins,sans-serif}.calculate-btn:hover{background:#334155;transform:translateY(-2px)}.result-box{margin-top:30px;padding:24px;background:#eff6ff;border:2px solid #dbeafe;border-radius:10px;text-align:center}.result-box small{text-transform:uppercase;letter-spacing:1px;color:#3b82f6;font-weight:700;font-size:.75rem}.result-value{font-size:32px;font-weight:800;color:#1e3a8a;margin-top:5px}.result-value span{font-size:1.2rem;color:#64748b}.pulse{animation:fadeIn .5s ease-in-out}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}