.ff-estimator-wrapper {
    max-width: 720px;
    margin: 0 auto;
    padding: 24px;
    background: #ffffff;
    border-radius: 12px;
    box-shadow: 0 14px 40px rgba(0, 0, 0, 0.06);
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.ff-estimator-title {
    margin-top: 0;
    margin-bottom: 18px;
    font-size: 1.4rem;
    font-weight: 600;
    color: #111827;
    text-align: center;
}

.ff-field {
    margin-bottom: 14px;
}

.ff-field label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 4px;
    color: #4b5563;
}

.ff-field input {
    width: 100%;
    padding: 10px 12px;
    border-radius: 8px;
    border: 1px solid #d1d5db;
    font-size: 0.95rem;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.ff-field input:focus {
    outline: none;
    border-color: #2563eb;
    box-shadow: 0 0 0 1px rgba(37, 99, 235, 0.25);
}

.ff-field.ff-half {
    display: flex;
    gap: 10px;
}

.ff-field.ff-half > div {
    flex: 1;
}

.ff-btn {
    width: 100%;
    margin-top: 6px;
    padding: 11px 16px;
    border-radius: 999px;
    border: none;
    background: linear-gradient(135deg, #19cd01, #1d4ed8);
    color: #19cd01;
    font-weight: 600;
    font-size: 0.98rem;
    cursor: pointer;
    transition: transform 0.1s ease, box-shadow 0.1s ease, opacity 0.1s ease;
}

.ff-btn:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 10px 25px rgba(37, 99, 235, 0.35);
}

.ff-btn:disabled {
    opacity: 0.7;
    cursor: default;
    box-shadow: none;
}

.ff-message {
    margin-top: 10px;
    padding: 8px 10px;
    border-radius: 8px;
    font-size: 0.85rem;
}

.ff-message--hidden {
    display: none;
}

.ff-message--success {
    background: #ecfdf3;
    color: #166534;
    border: 1px solid #bbf7d0;
}

.ff-message--error {
    background: #fef2f2;
    color: #b91c1c;
    border: 1px solid #fecaca;
}

.ff-estimate-result {
    margin-top: 18px;
    padding-top: 14px;
    border-top: 1px solid #e5e7eb;
    text-align: center;
}

.ff-estimate-result--hidden {
    display: none;
}

.ff-estimate-number {
    font-size: 1.6rem;
    font-weight: 700;
    color: #111827;
    margin: 6px 0 4px;
}

.ff-estimate-note {
    font-size: 0.8rem;
    color: #6b7280;
}