.existing-container {
    max-width: 600px;
    margin: 2rem auto;
    background: #fff;
    border-radius: 32px;
    padding: 2.5rem 2rem;
    box-shadow: 0 25px 45px rgba(0,0,0,0.08);
    text-align: center;
}
.existing-container h1 {
    font-size: 1.8rem;
    color: #1e3c72;
    margin-bottom: 1rem;
}
.existing-container p {
    color: #1e4663;
    line-height: 1.7;
    margin-bottom: 1.5rem;
}
.form-group {
    margin-bottom: 1.5rem;
    text-align: left;
}
.form-group label {
    font-weight: 600;
    color: #1e4663;
    display: block;
    margin-bottom: 0.5rem;
}
.form-group input,
.form-group select {
    width: 100%;
    padding: 12px;
    border: 1.5px solid #e2e9f2;
    border-radius: 12px;
    font-size: 1rem;
}
.error-message {
    background: #fee2e2;
    color: #b91c1c;
    padding: 10px;
    border-radius: 12px;
    margin-bottom: 1rem;
    font-size: 0.9rem;
}
.btn-group {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
    margin-top: 1.5rem;
}
.btn-primary {
    background: linear-gradient(105deg, #146b9e, #0f5883);
    color: white;
    border: none;
    padding: 0.9rem 2rem;
    border-radius: 40px;
    font-weight: 700;
    cursor: pointer;
    text-decoration: none;
    transition: 0.2s;
    font-size: 1rem;
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 14px rgba(20,107,158,0.3);
}
.btn-secondary {
    background: #e2e8f0;
    color: #1e4663;
    padding: 0.9rem 2rem;
    border-radius: 40px;
    font-weight: 600;
    text-decoration: none;
    transition: 0.2s;
    font-size: 1rem;
}
.btn-secondary:hover {
    background: #cbd5e1;
}
@media (max-width: 600px) {
    .existing-container {
        padding: 1.5rem;
        margin: 1rem;
    }
    .btn-group {
        flex-direction: column;
        align-items: center;
    }
}