.calculator-panel {
    background: var(--card-bg);
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    margin: 2rem auto;
    max-width: 400px;
    padding: 2rem;
}

.calculator-tabs {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

.tab-btn {
    padding: 0.75rem 1.5rem;
    border: none;
    background: none;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    color: var(--text-color);
    transition: all 0.3s;
}

.tab-btn.active {
    border-bottom-color: var(--primary-color);
    color: var(--primary-color);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* 标准计算器样式 */
.calc-display {
    background: var(--bg-color);
    padding: 1rem;
    border-radius: 4px;
    margin-bottom: 1rem;
}

.calc-history {
    min-height: 20px;
    color: var(--text-color);
    opacity: 0.7;
    font-size: 0.875rem;
    text-align: right;
}

#calc-input {
    width: 100%;
    border: none;
    background: none;
    font-size: 1.5rem;
    text-align: right;
    color: var(--text-color);
}

.calc-buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.5rem;
}

.calc-btn {
    padding: 1rem;
    border: none;
    border-radius: 4px;
    background: var(--bg-color);
    color: var(--text-color);
    font-size: 1.25rem;
    cursor: pointer;
    transition: all 0.2s;
}

.calc-btn:hover {
    background: var(--primary-color);
    color: white;
}

.calc-btn.operator {
    background: rgba(37, 99, 235, 0.1);
    color: var(--primary-color);
}

/* 单位换算样式 */
.unit-converter {
    display: grid;
    gap: 1rem;
}

.converter-inputs {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 1rem;
    align-items: center;
}

.input-group {
    display: grid;
    gap: 0.5rem;
}

.input-group input,
.input-group select,
#unitType {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #e5e7eb;
    border-radius: 4px;
    background: var(--bg-color);
    color: var(--text-color);
}

.fa-exchange-alt {
    color: var(--primary-color);
}