body {
    font-family: 'Poppins', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

.rtse-card {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2);
    padding: 40px;
    margin-top: 50px;
    border: none;
}

.form-header {
    text-align: center;
    margin-bottom: 30px;
    color: #4a4a4a;
}

.form-header h2 {
    font-weight: 700;
    color: #764ba2;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.form-label {
    font-weight: 500;
    color: #555;
    font-size: 0.9rem;
}

.input-group-text {
    background-color: #f0f2f5;
    border: 1px solid #ced4da;
    border-right: none;
    color: #764ba2;
}

.form-control,
.form-select {
    height: 48px;
    border-left: none;
    background-color: #fcfcfc;
    box-shadow: none !important;
    border-color: #ced4da;
}

.form-control:focus,
.form-select:focus {
    background-color: #fff;
    border-color: #764ba2;
}

.input-group:focus-within .input-group-text {
    border-color: #764ba2;
    background-color: #fff;
}

.section-title {
    border-bottom: 2px solid #eee;
    padding-bottom: 10px;
    margin: 20px 0;
    color: #764ba2;
    font-size: 1.1rem;
    font-weight: 600;
}

.btn-submit {
    background: linear-gradient(to right, #667eea, #764ba2);
    border: none;
    color: white;
    padding: 12px 40px;
    border-radius: 50px;
    font-size: 18px;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(118, 75, 162, 0.4);
}

.btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(118, 75, 162, 0.6);
    color: #fff;
}

.payment-card {
    background: #fff;
    border-radius: 15px;
    padding: 20px;
    text-align: center;
    margin-top: 30px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

/* Mobile adjustments */
@media (max-width: 768px) {
    .rtse-card {
        padding: 20px;
    }
}