:root {
    --primary-color: #2E7D32;
    --secondary-color: #4CAF50;
    --background-color: #f5f5f5;
    --border-color: #ddd;
}

body {
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
    line-height: 1.6;
    background-color: var(--background-color);
}

header {
    background-color: var(--primary-color);
    color: white;
    padding: 1rem 2rem;
}

.logo {
    margin-bottom: 0.5rem;
}

.logo a {
    text-decoration: none;
    color: white;
}

.logo-text {
    font-size: 1.8rem;
    font-weight: bold;
}

.logo-text .highlight {
    color: #90EE90; /* 亮荧光绿色 */
}

.breadcrumb {
    font-size: 0.9rem;
}

.breadcrumb a {
    color: white;
    text-decoration: none;
}

.converter-tool {
    background: #f5f5f5;
    padding: 2rem;
    margin: 2rem auto;
    max-width: 800px;
    border-radius: 4px;
}

.result {
    background: white;
    padding: 1rem;
    margin-bottom: 2rem;
    border-radius: 4px;
}

.result span {
    color: #ff0000;
    font-weight: bold;
}

.converter-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.input-group {
    background: white;
    padding: 1rem;
    border-radius: 4px;
}

.input-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: bold;
}

.input-group input {
    width: 100%;
    padding: 0.5rem;
    margin-bottom: 1rem;
    border: 1px solid #ccc;
    border-radius: 4px;
}

.unit-list {
    height: 300px;
    overflow-y: auto;
    border: 1px solid #ccc;
}

.unit-item {
    padding: 0.5rem;
    cursor: pointer;
}

.unit-item:hover {
    background-color: #f0f0f0;
}

.unit-item.selected {
    background-color: #e0e0e0;
}

/* 滚动条样式 */
.unit-list::-webkit-scrollbar {
    width: 8px;
}

.unit-list::-webkit-scrollbar-track {
    background: #f1f1f1;
}

.unit-list::-webkit-scrollbar-thumb {
    background: #888;
    border-radius: 4px;
}

.unit-list::-webkit-scrollbar-thumb:hover {
    background: #555;
}

.tools-navigation {
    max-width: 800px;
    margin: 2rem auto;
    background: white;
    padding: 2rem;
    border-radius: 8px;
    text-align: center;
}

.converter-categories {
    display: flex;
    justify-content: center; /* 水平居中 */
    align-items: center; /* 垂直居中 */
}

.converter-categories ul {
    list-style: none;
    padding: 0;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0;
    border: 1px solid #ccc;
    width: 400px; /* 固定宽度 */
    margin: 0 auto;
}

.converter-categories li {
    padding: 0.5rem;
    border: 1px solid #ccc;
}

.converter-categories a {
    text-decoration: underline;
    color: #333;
    display: block;
}

.converter-categories a:hover {
    text-decoration: none;
}

/* 移动端适配 */
@media screen and (max-width: 768px) {
    .converter-categories ul {
        width: 90%; /* 移动端使用百分比宽度 */
    }
}
.converter-categories a.active {
    color: var(--primary-color);
    font-weight: bold;
}
.seo-content {
    max-width: 800px;
    margin: 2rem auto;
    padding: 2rem;
    background: white;
    border-radius: 8px;
}

/* 主标题样式 */
.seo-content h2 {
    color: #2E7D32;
    padding: 1.5rem 0 1rem;
    margin-top: 2.5rem;
    border-bottom: 2px solid #4CAF50;
}

/* 第一个 h2 不需要顶部边距 */
.seo-content h2:first-child {
    margin-top: 0;
}

/* 子标题样式 */
.seo-content h3 {
    color: #333;
    margin: 1.5rem 0 1rem;
}

.seo-content h4 {
    color: #555;
    margin: 1.2rem 0 0.8rem;
}

/* 内容块样式 */
.seo-content p {
    line-height: 1.6;
    color: #444;
    margin-bottom: 1rem;
}

/* 列表样式 */
.seo-content ul,
.seo-content ol {
    padding-left: 1.5rem;
    margin: 1rem 0;
}

.seo-content li {
    margin-bottom: 0.5rem;
    line-height: 1.5;
    color: #444;
}

/* 内容模块样式 */
.seo-content section {
    background: #f9f9f9;
    padding: 1.5rem;
    margin: 1.5rem 0;
    border-radius: 4px;
    border: 1px solid #eee;
}

/* 响应式调整 */
@media screen and (max-width: 768px) {
    .seo-content {
        padding: 1rem;
        margin: 1rem;
    }
    
    .seo-content h2 {
        padding: 1rem 0 0.8rem;
        margin-top: 2rem;
    }
}

footer {
    text-align: center;
    padding: 2rem;
    background: var(--primary-color);
    color: white;
    margin-top: 2rem;
}

.result-display {
    background-color: #f8f9fa;
    padding: 1rem;
    margin-bottom: 2rem;
    border-radius: 4px;
    border: 1px solid var(--border-color);
}

.result-display span:first-child {
    color: #dc3545;
    font-weight: bold;
    margin-right: 0.5rem;
}

.unit-select {
    width: 250px !important;
    height: 200px !important;
}

.input-group select {
    width: 250px;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
}

.input-group input {
    width: 200px;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
}

/* 添加媒体查询，在小屏幕上改为单列布局 */
@media screen and (max-width: 768px) {
    .converter-container {
        grid-template-columns: 1fr; /* 改为单列 */
        gap: 1rem;
    }

    .converter-tool {
        padding: 1rem;
        margin: 1rem;
    }

    .input-group {
        width: 100%;
        box-sizing: border-box;
    }

    .unit-list {
        width: 100%;
        box-sizing: border-box;
    }
}

/* 确保所有元素都使用 border-box */
* {
    box-sizing: border-box;
}