.invest-calc-wrapper {
    background: #fff;
    padding: 20px;
    border-radius: 10px;
    border: 1px solid #e5e5e5;
    max-width: 520px;
}

.invest-calc-wrapper .input-field {
    width: 100%;
    border: 1px solid #ccc;
    padding: 8px 10px;
    margin-bottom: 12px;
    border-radius: 6px;
}

.btn-calc {
    width: 100%;
    background: #2563eb;
    color: white;
    padding: 10px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
}

.btn-calc:hover {
    background: #1e4fc7;
}

.loading-box {
    display: flex;
    align-items: center;
    gap: 10px;
    background: #f8f8f8;
    border: 1px solid #ddd;
    padding: 12px;
    margin-top: 15px;
    border-radius: 6px;
}

.hidden { display: none; }

.spinner {
    width: 20px;
    height: 20px;
    border: 3px solid #ddd;
    border-top-color: #2563eb;
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.result-box {
    background: #fff;
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 16px;
    margin-top: 15px;
}