* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #e9ecef 100%);
    min-height: 100vh;
    padding: 40px 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
}

.header {
    text-align: center;
    margin-bottom: 50px;
    color: #333;
}

.header h1 {
    font-size: 2.5rem;
    margin-bottom: 15px;
    font-weight: 600;
    color: #2c3e50;
}

.header p {
    font-size: 1.1rem;
    color: #7f8c8d;
}

.tools-grid {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.tool-card {
    background: white;
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    cursor: pointer;
    text-decoration: none;
    color: inherit;
    display: block;
    border: 2px solid transparent;
}

.tool-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.12);
    border-color: #999;
}

.tool-card-header {
    display: flex;
    align-items: center;
    margin-bottom: 15px;
}

.tool-icon {
    font-size: 2.5rem;
    margin-right: 20px;
}

.tool-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: #2c3e50;
}

.tool-description {
    font-size: 1rem;
    color: #666;
    line-height: 1.6;
    margin-bottom: 15px;
}

.tool-link {
    display: inline-flex;
    align-items: center;
    color: #999;
    font-size: 0.9rem;
    font-weight: 500;
}

.tool-link::after {
    content: '→';
    margin-left: 8px;
    transition: transform 0.3s ease;
}

.tool-card:hover .tool-link::after {
    transform: translateX(5px);
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
}

.empty-state-icon {
    font-size: 4rem;
    margin-bottom: 20px;
}

.empty-state p {
    font-size: 1.1rem;
    color: #999;
    margin-bottom: 10px;
}

.empty-state small {
    font-size: 0.9rem;
    color: #bbb;
}

/* 响应式设计 */
@media (max-width: 768px) {
    body {
        padding: 20px 15px;
    }

    .header h1 {
        font-size: 2rem;
    }

    .header p {
        font-size: 1rem;
    }

    .tool-card {
        padding: 20px;
    }

    .tool-icon {
        font-size: 2rem;
        margin-right: 15px;
    }

    .tool-title {
        font-size: 1.2rem;
    }

    .tool-description {
        font-size: 0.9rem;
    }
}