.rut-card {
    max-width: 600px;
    margin: 40px auto;
    background: #ffffff;
    padding: 30px;
    border-radius: 18px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

.rut-card h2 { margin-bottom: 10px; font-size: 24px; }
.description { font-size: 14px; color: #666; margin-bottom: 20px; }

.rut-input-group label { font-weight: 600; font-size: 14px; }

.rut-input-group input {
    width: 100%;
    padding: 12px;
    margin-top: 5px;
    border-radius: 10px;
    border: 1px solid #ddd;
    font-size: 14px;
}

.rut-hint { font-size: 12px; color: #888; margin-top: 5px; }

.rut-btn {
    margin-top: 20px;
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 12px;
    background: linear-gradient(135deg, #4f46e5, #9333ea);
    color: white;
    font-weight: 600;
    cursor: pointer;
    transition: 0.3s;
}

.rut-btn:hover { opacity: 0.9; }

.rut-result {
    margin-top: 25px;
    display: none;
    animation: fadeIn 0.5s ease-in-out forwards;
}

.rut-success {
    background: #e6f9f0;
    padding: 12px;
    border-radius: 10px;
    color: #047857;
    font-weight: 600;
    margin-bottom: 15px;
}

.rut-grid {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.rut-info-card {
    flex: 1;
    min-width: 45%;
    background: #f9fafb;
    padding: 15px;
    border-radius: 12px;
    text-align: center;
}

.rut-alert {
    background: #fff8db;
    padding: 12px;
    border-radius: 10px;
    margin-top: 20px;
    font-size: 13px;
    color: #92400e;
}

.rut-reset {
    margin-top: 15px;
    background: #e5e7eb;
    border: none;
    padding: 10px;
    border-radius: 10px;
    cursor: pointer;
}

@media(max-width:600px){
    .rut-grid{ flex-direction: column; }
}

@keyframes fadeIn {
    from {opacity:0; transform: translateY(10px);}
    to {opacity:1; transform: translateY(0);}
}