* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Microsoft YaHei', sans-serif;
}

body {
    background-color: #f5f7fa;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 30px;
    padding: 20px 0;
    background: linear-gradient(135deg, #6e8efb, #a777e3);
    color: white;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
}

.tabs {
    display: flex;
    flex-wrap: nowrap;
    gap: 5px;
    margin-bottom: 20px;
    justify-content: center;
    overflow-x: auto;
    padding-bottom: 5px;
}

.tab-btn {
    padding: 8px 12px;
    background-color: #fff;
    border: 1px solid #ddd;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: bold;
    font-size: 0.9rem;
    white-space: nowrap;
}

.tab-btn:hover {
    background-color: #f0f0f0;
    transform: translateY(-2px);
}

.tab-btn.active {
    background-color: #6e8efb;
    color: white;
    border-color: #6e8efb;
    box-shadow: 0 4px 8px rgba(110, 142, 251, 0.3);
}

.tab-content {
    display: none;
    animation: fadeIn 0.5s ease;
}

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

.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.tool-card {
    background-color: white;
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border-top: 3px solid #6e8efb;
}

.tool-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.tool-name {
    font-size: 1.2rem;
    font-weight: bold;
    margin-bottom: 10px;
    color: #333;
}

.tool-url {
    color: #6e8efb;
    text-decoration: none;
    word-break: break-all;
    display: block;
    margin: 5px 0;
    font-size: 0.9rem;
}

.tool-url:hover {
    text-decoration: underline;
}

.tool-desc {
    font-size: 0.9rem;
    color: #666;
    margin-top: 10px;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.counter {
    display: none;
}

footer {
    text-align: center;
    margin-top: 40px;
    padding: 20px;
    color: #666;
    font-size: 0.9rem;
    border-top: 1px solid #eee;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .tool-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    }
    
    .tabs {
        justify-content: flex-start;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .tab-btn {
        padding: 6px 10px;
        font-size: 0.85rem;
    }
}

@media (max-width: 480px) {
    .tool-grid {
        grid-template-columns: 1fr;
    }
    
    .tab-btn {
        padding: 8px 12px;
        font-size: 0.9rem;
    }
}

/* 搜索框样式 */
.search-container {
    margin-bottom: 20px;
    display: flex;
    justify-content: center;
}

.search-input {
    width: 100%;
    max-width: 500px;
    padding: 10px 15px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
    outline: none;
    transition: all 0.3s ease;
}

.search-input:focus {
    border-color: #6e8efb;
    box-shadow: 0 0 0 2px rgba(110, 142, 251, 0.2);
}

/* 回到顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 40px;
    height: 40px;
    background-color: #6e8efb;
    color: white;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.3s ease;
    box-shadow: 0 2px 10px rgba(0,0,0,0.2);
}

.back-to-top.visible {
    opacity: 1;
}