.tool-period-calculator {
    background-color: var(--background-color);
}

.tool-period-calculator .period-calculator-wrapper {
    border: none;
    border-radius: 1rem;
    background: #ffffff;
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.05);
}

.period-calculator-header {
    text-align: center;
    padding-bottom: 1rem;
    border-bottom: 2px solid #e5e7eb;
}

.period-calculator-form .form-label {
    color: var(--text-color);
    margin-bottom: 0.5rem;
}

.period-calculator-form .form-control-lg {
    font-size: 1.25rem;
    padding: 0.75rem 1rem;
    border: 2px solid #e5e7eb;
    border-radius: 0.5rem;
    transition: all 0.2s ease-in-out;
}

.period-calculator-form .form-control-lg:focus {
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 0.2rem rgba(59, 130, 246, 0.1);
}

.btn-accent {
    background-color: var(--accent-color);
    color: #ffffff;
    border: none;
    font-weight: 600;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    transition: all 0.2s ease-in-out;
}

.btn-accent:hover {
    background-color: #16a34a;
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(34, 197, 94, 0.3);
}

.btn-accent:active {
    transform: translateY(0);
}

.period-calculator-result {
    margin-top: 2rem;
}

.result-card {
    background: linear-gradient(135deg, #f9fafb 0%, #f3f4f6 100%);
    border: 2px solid #e5e7eb;
    border-radius: 0.75rem;
    padding: 2rem;
    transition: all 0.2s ease-in-out;
}

.result-card:hover {
    border-color: var(--secondary-color);
    box-shadow: 0 4px 8px rgba(59, 130, 246, 0.1);
}

.result-details {
    text-align: left;
    background: #ffffff;
    padding: 1.5rem;
    border-radius: 0.5rem;
    border: 1px solid #e5e7eb;
}

.detail-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 0;
    border-bottom: 1px solid #e5e7eb;
}

.detail-item:last-child {
    border-bottom: none;
}

.detail-label {
    font-weight: 600;
    color: #6b7280;
    display: flex;
    align-items: center;
}

.detail-label i {
    color: var(--secondary-color);
    width: 20px;
}

.detail-value {
    font-weight: 500;
    color: var(--text-color);
    text-align: right;
}

.alert-info {
    background-color: #e0f2fe;
    border-color: #bae6fd;
    color: #0369a1;
}

@media (max-width: 767.98px) {
    .period-calculator-form .form-control-lg {
        font-size: 1.1rem;
    }
    
    .detail-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
    
    .detail-value {
        text-align: left;
    }
}