.pp4-calculator {
    max-width: 620px;
    padding: 24px;
    border: 1px solid #e5e7eb;
    border-radius: 14px;
    background: #ffffff;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
    font-family: inherit;
}

.pp4-title {
    margin: 0 0 10px;
    font-size: 1.45rem;
    line-height: 1.25;
}

.pp4-intro,
.pp4-note {
    margin: 0 0 16px;
    line-height: 1.55;
}

.pp4-note {
    margin-top: 14px;
    font-size: 0.95rem;
    opacity: 0.82;
}

.pp4-form {
    display: flex;
    gap: 10px;
    align-items: flex-end;
    flex-wrap: wrap;
    margin: 18px 0;
}

.pp4-label {
    width: 100%;
    font-weight: 700;
}

.pp4-input {
    flex: 1 1 220px;
    min-height: 44px;
    padding: 10px 12px;
    border: 1px solid #cbd5e1;
    border-radius: 10px;
    font-size: 1rem;
}

.pp4-button {
    min-height: 44px;
    padding: 10px 18px;
    border: 0;
    border-radius: 10px;
    cursor: pointer;
    font-weight: 700;
    font-size: 1rem;
    background: #111827;
    color: #ffffff;
}

.pp4-button:hover,
.pp4-button:focus {
    opacity: 0.9;
}

.pp4-result {
    display: none;
    padding: 14px 16px;
    border-radius: 10px;
    line-height: 1.5;
}

.pp4-result--success,
.pp4-result--fail,
.pp4-result--error {
    display: block;
}

.pp4-result--success {
    background: #ecfdf3;
    border: 1px solid #bbf7d0;
}

.pp4-result--fail {
    background: #fff7ed;
    border: 1px solid #fed7aa;
}

.pp4-result--error {
    background: #fef2f2;
    border: 1px solid #fecaca;
}