:root {
    --primary-color: #7e57c2;
    --primary-gradient: linear-gradient(135deg, #5e35b1, #7e57c2);
    --secondary-color: #ff9800;
    --accent-color: #7c4dff;
    --text-dark: #333;
    --text-light: #777;
    --bg-light: #f8f9fa;
    --border-color: #e0e0e0;
    --card-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
    --hover-shadow: 0 15px 35px rgba(0, 0, 0, 0.15);
}

body {
    font-family: 'Inter', sans-serif;
    color: var(--text-dark);
    line-height: 1.6;
    background-color: #f5f7fa;
    margin: 0;
    padding: 0;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}

/* 头部样式 */
header {
    background-color: white;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    position: sticky;
    top: 0;
    z-index: 100;
}

/* 应用包装器样式 */
.app-wrapper {
    padding: 30px 0 60px;
}

.app-header {
    text-align: center;
    margin-bottom: 40px;
}

.app-header h1 {
    font-size: 36px;
    color: var(--text-dark);
    margin-bottom: 10px;
    font-weight: 700;
}

.app-subtitle {
    font-size: 18px;
    color: var(--text-light);
    margin: 0;
}

/* 计算器内容区域 */
.calculator-content {
    background-color: white;
    border-radius: 16px;
    box-shadow: var(--card-shadow);
    overflow: hidden;
}

/* 选项卡样式 */
.calculator-tabs {
    display: flex;
    background-color: #f5f7fa;
    border-bottom: 1px solid var(--border-color);
    overflow-x: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.calculator-tabs::-webkit-scrollbar {
    display: none;
}

.tab-btn {
    padding: 16px 24px;
    font-size: 15px;
    font-weight: 600;
    color: var(--text-light);
    background: none;
    border: none;
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.3s ease;
    position: relative;
    display: flex;
    align-items: center;
    gap: 8px;
}

.tab-btn:hover {
    color: var(--text-dark);
}

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

.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background-color: var(--primary-color);
}

.tab-btn i {
    font-size: 16px;
}

/* 计算器面板 */
.calculator-panels {
    padding: 30px;
}

.calculator-panel {
    display: none;
}

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

.calculator-card {
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.card-header {
    background-color: #f8f9fa;
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 15px;
}

.card-header i {
    font-size: 24px;
    color: var(--primary-color);
    background-color: rgba(126, 87, 194, 0.1);
    width: 50px;
    height: 50px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.card-title {
    margin: 0 0 5px;
    font-size: 20px;
    font-weight: 600;
    color: var(--text-dark);
}

.section-subtitle {
    font-size: 14px;
    color: var(--text-light);
}

.card-body {
    padding: 25px;
}

/* 输入组样式 */
.input-group {
    margin-bottom: 20px;
}

.input-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-dark);
}

.converter-input {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 16px;
    transition: all 0.3s ease;
}

.converter-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(126, 87, 194, 0.1);
}

.converter-select {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 16px;
    background-color: white;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='6' fill='none'%3E%3Cpath fill='%23666' d='M6 6 0 0h12L6 6Z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 15px center;
    transition: all 0.3s ease;
}

.converter-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(126, 87, 194, 0.1);
}

/* 标准计算器样式 */
.calculator-display {
    width: 100%;
    padding: 15px;
    font-size: 18px;
    text-align: right;
    background-color: var(--bg-light);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 15px;
}

.calculator-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
}

.calc-btn {
    background-color: white;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 15px;
    font-size: 18px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.calc-btn:hover {
    background-color: var(--bg-light);
}

.calc-btn.number {
    background-color: #f5f7fa;
}

.calc-btn.operator {
    background-color: #eef1f6;
    color: var(--primary-color);
    font-weight: 600;
}

.calc-btn.equal {
    background-color: var(--primary-color);
    color: white;
    grid-column: span 2;
}

/* 语音控制样式 */
.voice-control {
    background-color: var(--bg-light);
    border-radius: 8px;
    padding: 15px;
    margin-bottom: 20px;
}

.voice-control-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
}

.voice-control-row:last-child {
    margin-bottom: 0;
}

.voice-toggle {
    display: flex;
    align-items: center;
    gap: 10px;
}

.toggle-switch {
    position: relative;
    display: inline-block;
    width: 46px;
    height: 24px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: .4s;
    border-radius: 24px;
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

input:checked + .toggle-slider {
    background-color: var(--primary-color);
}

input:checked + .toggle-slider:before {
    transform: translateX(22px);
}

/* 体积计算器样式 */
.dimension-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    margin-bottom: 20px;
}

.shape-input {
    margin-top: 20px;
    margin-bottom: 20px;
}

.btn {
    padding: 12px 25px;
    border-radius: 8px;
    font-weight: 500;
    font-size: 15px;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

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

.btn-primary:hover {
    background-color: #6c42b8;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(126, 87, 194, 0.2);
}

.volume-results {
    margin-top: 25px;
    background-color: var(--bg-light);
    border-radius: 8px;
    padding: 20px;
}

.result-item {
    display: flex;
    justify-content: space-between;
    padding: 10px 0;
    border-bottom: 1px solid var(--border-color);
}

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

.result-label {
    font-weight: 500;
    color: var(--text-dark);
}

.result-value {
    font-weight: 600;
    color: var(--primary-color);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .card-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    
    .calculator-panels {
        padding: 20px;
    }
    
    .card-body {
        padding: 20px;
    }
}

@media (max-width: 480px) {
    .tab-btn {
        padding: 12px 16px;
        font-size: 14px;
    }
    
    .card-header i {
        width: 40px;
        height: 40px;
        font-size: 18px;
    }
    
    .card-title {
        font-size: 18px;
    }
    
    .calculator-panels {
        padding: 15px;
    }
    
    .card-body {
        padding: 15px;
    }
}