/* 全局样式 */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* 工具类 */
.hidden {
    display: none !important;
}

/* 分类标题样式 */
.category-title {
    color: #2c3e50;
    margin: 2rem 0 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid #3498db;
    font-size: 1.2rem;
}

/* 分类组容器 */
.category-group {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

/* 工具容器响应式布局 */
.tool-container {
    padding: 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
    box-sizing: border-box;
}

@media (max-width: 600px) {
    .category-group {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }
}

@media (max-width: 400px) {
    .category-group {
        grid-template-columns: 1fr;
    }
}

/* 基础卡片样式 */
.tool-card {
    background-color: white;
    border-radius: 10px;
    padding: 1rem;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    transition: all 0.3s ease;
    text-align: center;
    position: relative;
    overflow: hidden;
    height: 200px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

/* 卡片内部元素 */
.card-icon {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: #3498db;
}

.tool-card h3 {
    color: #2c3e50;
    margin: 0.25rem 0;
    font-size: 0.9rem;
}

.tool-card p {
    color: #7f8c8d;
    margin: 0.25rem 0 0.75rem;
    font-size: 0.7rem;
}

.use-btn {
    padding: 0.5rem 1rem;
}

.tool-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px rgba(0,0,0,0.12);
}

.card-icon {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: #3498db;
}

.tool-card h3 {
    color: #2c3e50;
    margin: 0.25rem 0;
    font-size: 0.9rem;
}

.tool-card p {
    color: #7f8c8d;
    margin: 0.25rem 0 0.75rem;
    font-size: 0.7rem;
}

/* 按钮样式 */
.use-btn {
    display: inline-block;
    background-color: #3498db;
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    text-align: center;
    margin-top: 0.5rem;
}

.use-btn:hover {
    background-color: #2980b9;
    transform: translateY(-2px);
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}

/* 返回按钮样式 */
.back-btn {
    display: inline-block;
    background-color: #3498db;
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    text-align: center;
    margin-bottom: 1.5rem;
    font-size: 1rem;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.back-btn:hover {
    background-color: #2980b9;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

/* 工具页面通用样式 */
.tool-page {
    padding: 2rem;
    flex: 1;
}

.tool-content {
    width: 100%;
    max-width: 100%;
    margin: 0 auto;
    padding: 2rem;
    box-sizing: border-box;
}

.info-card {
    background-color: #f8f9fa;
    padding: 1.5rem;
    border-radius: 6px;
    margin: 1.5rem 0;
}

.info-card p {
    margin: 0.75rem 0;
    font-size: 1.05rem;
}

.info-card strong {
    color: #2c3e50;
}