.tool-container {
    max-width: 1200px;
    margin: 30px auto;
    padding: 0 20px;
}
.tool-title {
    font-size: 26px;
    text-align: center;
    font-weight: bold;
    margin-bottom: 20px;
    color: #333;
}
.tool-desc {
    background: #f9f9f9;
    padding: 20px 24px;
    border-radius: 12px;
    margin-bottom: 24px;
    line-height: 1.8;
    font-size: 15px;
    color: #444;
}
.tool-desc h2 {
    font-size: 20px;
    margin-bottom: 12px;
    color: #222;
}
.tool-desc p {
    text-indent: 2em;
    margin-bottom: 10px;
}

/* 外层Tab */
.tab-wrap {
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.08);
    overflow: hidden;
}
.tab-nav {
    display: flex;
    background: #f5f7fa;
    border-bottom: 1px solid #eee;
}
.tab-item {
    padding: 14px 20px;
    cursor: pointer;
    font-size: 15px;
    color: #666;
    border-bottom: 3px solid transparent;
}
.tab-item.active {
    color: #409eff;
    border-bottom-color: #409eff;
    font-weight: 500;
}
.tab-content {
    padding: 24px;
    display: none;
}
.tab-content.active {
    display: block;
}

/* 子Tab */
.sub-tab {
    display: flex;
    gap: 15px;
    margin-bottom: 20px;
}
.sub-tab-item {
    padding: 6px 16px;
    border: 1px solid #ddd;
    border-radius: 20px;
    cursor: pointer;
    font-size: 14px;
}
.sub-tab-item.active {
    background: #409eff;
    color: #fff;
    border-color: #409eff;
}
.sub-content {
    display: none;
}
.sub-content.active {
    display: block;
}

/* 表单区域 */
.calc-box {
    margin-bottom: 20px;
}
.form-item {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}
.form-item label {
    width: 120px;
    font-weight: 500;
    font-size: 14px;
}
.input-text {
    padding: 8px 12px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 14px;
}
.short-input {
    width: 100px;
}
.select-unit {
    padding: 8px 10px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 14px;
}
.tip-text {
    color: #999;
    margin: 0 0 15px 0;
}

/* 按钮 */
.btn {
    padding: 8px 18px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
}
.btn-blue {
    background: #409eff;
    color: #fff;
}
.btn-green {
    background: #67c23a;
    color: #fff;
}
.btn-red {
    background: #f56c6c;
    color: #fff;
}
.btn-default {
    background: #f0f0f0;
    color: #333;
}

/* 结果表格 */
.result-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 20px;
    font-size: 14px;
}
.result-table td, .result-table th {
    border: 1px solid #eee;
    padding: 12px;
}
.result-table td:first-child {
    background: #f8f9fa;
    width: 140px;
    font-weight: 500;
}
.compare-table th {
    background: #f0f7ff;
    font-weight: 500;
}
.btn-group {
    display: flex;
    gap: 12px;
}