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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f7fa;
}

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

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

h1 {
    color: #2c3e50;
    font-size: 2.2rem;
}

.search-box {
    display: flex;
    align-items: center;
}

#search-input {
    width: 300px;
    padding: 10px 15px;
    border: 1px solid #ddd;
    border-radius: 4px 0 0 4px;
    font-size: 1rem;
}

#search-btn {
    background-color: #3498db;
    color: white;
    border: none;
    padding: 10px 15px;
    border-radius: 0 4px 4px 0;
    cursor: pointer;
    transition: background-color 0.3s;
}

#search-btn:hover {
    background-color: #2980b9;
}

.file-upload {
    background-color: #ecf0f1;
    padding: 15px;
    border-radius: 6px;
    margin-bottom: 30px;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    transition: background-color 0.3s, box-shadow 0.3s;
}

.file-upload.highlight {
    background-color: #d6eaf8;
    box-shadow: 0 0 10px rgba(52, 152, 219, 0.5);
}

.file-upload label {
    font-weight: 600;
    margin-right: 15px;
}

.file-upload input[type="file"] {
    margin-right: 15px;
}

.file-hint {
    color: #7f8c8d;
    font-size: 0.9rem;
}

.guide-link {
    margin-left: 15px;
    color: #3498db;
    text-decoration: none;
    font-size: 0.9rem;
}

.guide-link:hover {
    text-decoration: underline;
}

.category {
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    margin-bottom: 30px;
    overflow: hidden;
}

.category-header {
    background-color: #3498db;
    color: white;
    padding: 15px 20px;
    font-size: 1.2rem;
    font-weight: 600;
    display: flex;
    align-items: center;
}

.category-header i {
    margin-right: 10px;
}

.category-content {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 15px;
    padding: 20px;
}

.bookmark-item {
    display: flex;
    align-items: center;
    padding: 10px;
    border-radius: 4px;
    transition: background-color 0.3s;
    text-decoration: none;
    color: #333;
}

.bookmark-item:hover {
    background-color: #f1f1f1;
}

.bookmark-icon {
    width: 16px;
    height: 16px;
    margin-right: 10px;
    object-fit: contain;
}

.bookmark-name {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

footer {
    text-align: center;
    margin-top: 40px;
    padding: 20px 0;
    color: #7f8c8d;
    font-size: 0.9rem;
}

/* Responsive design */
@media (max-width: 768px) {
    header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .search-box {
        width: 100%;
        margin-top: 15px;
    }
    
    #search-input {
        width: 100%;
    }
    
    .file-upload {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .file-upload label, .file-upload input[type="file"] {
        margin-bottom: 10px;
        margin-right: 0;
    }
    
    .category-content {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    }
}

@media (max-width: 480px) {
    .category-content {
        grid-template-columns: 1fr 1fr;
    }
}