.tool-title-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--primary-light);
}

.tool-title-wrapper i {
    font-size: 2rem;
    color: var(--primary-color);
}

.tool-title-wrapper .tool-title {
    margin-bottom: 0;
    border-bottom: none;
}

.calc-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
}

.calc-tab {
    flex: 1;
    min-width: 140px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 14px;
    background: var(--bg-light);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 13px;
    cursor: pointer;
    transition: var(--transition-fast);
}

.calc-tab:hover {
    background: var(--primary-light);
    color: var(--primary-color);
    border-color: #d6e8ff;
}

.calc-tab.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.calc-panels-wrapper {
    position: relative;
}

.calc-panel {
    display: none;
}

.calc-panel.active {
    display: block;
}

.calc-formula {
    padding: 10px 14px;
    background: var(--primary-light);
    border-radius: var(--radius-md);
    font-size: 13px;
    color: var(--primary-color);
    font-family: 'Consolas', 'Monaco', monospace;
    margin-bottom: 16px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
    margin-bottom: 16px;
}

.calc-result {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
    border-radius: var(--radius-md);
    color: white;
    margin-bottom: 12px;
}

.result-label {
    font-size: 15px;
    color: rgba(255, 255, 255, 0.8);
}

.result-value {
    font-size: 28px;
    font-weight: 700;
    font-family: 'Consolas', 'Monaco', monospace;
}

.calc-detail {
    padding: 12px 14px;
    background: var(--bg-light);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 13px;
    color: var(--text-secondary);
    font-family: 'Consolas', 'Monaco', monospace;
    text-align: center;
}

.discount-quick {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
    margin-bottom: 16px;
    font-size: 13px;
    color: var(--text-secondary);
}

.quick-btn {
    padding: 6px 12px;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 13px;
    cursor: pointer;
    transition: var(--transition-fast);
}

.quick-btn:hover {
    background: var(--primary-light);
    color: var(--primary-color);
    border-color: #d6e8ff;
}

@media (max-width: 768px) {
    .calc-tabs {
        flex-direction: column;
    }

    .calc-tab {
        width: 100%;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .calc-result {
        flex-direction: column;
        gap: 8px;
        text-align: center;
    }

    .result-value {
        font-size: 24px;
    }
}