class Style:
    @staticmethod
    def get_css():
        """返回應用程式的 CSS 樣式"""
        css = """
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
            background: linear-gradient(135deg, #e0f7fa, #b2ebf2);
            margin: 0;
            padding: 0;
            display: flex;
            justify-content: center;
            min-height: 100vh;
        }
        
        .gradio-container {
            max-width: 1200px !important;
            margin: 0 auto; /* 確保容器居中 */
            padding: 1rem;
            width: 100%;
        }
        
        .app-header {
            text-align: center;
            margin-bottom: 2rem;
            background: rgba(255, 255, 255, 0.8);
            padding: 1.5rem;
            border-radius: 10px;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            width: 100%;
        }
        
        .app-title {
            color: #2D3748;
            font-size: 2.5rem;
            margin-bottom: 0.5rem;
            background: linear-gradient(90deg, #38b2ac, #4299e1);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        
        .app-subtitle {
            color: #4A5568;
            font-size: 1.2rem;
            font-weight: normal;
            margin-top: 0.25rem;
        }
        
        .app-divider {
            width: 80px;
            height: 3px;
            background: linear-gradient(90deg, #38b2ac, #4299e1);
            margin: 1rem auto;
        }
        
        .input-panel, .output-panel {
            background: white;
            border-radius: 10px;
            padding: 1.5rem;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
            margin: 0 auto 1rem auto; /* 確保面板居中 */
        }
        
        /* 改變灰色背景為更好看的漸變色 */
        .how-to-use {
            background: linear-gradient(135deg, #f6f9fc, #edf2f7);
            border-radius: 10px;
            padding: 1.5rem;
            margin-top: 1rem;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
            color: #2d3748;
        }
        
        .detect-btn {
            background: linear-gradient(90deg, #38b2ac, #4299e1) !important;
            color: white !important;
            border: none !important;
            border-radius: 8px !important;
            transition: transform 0.3s, box-shadow 0.3s !important;
            font-weight: bold !important;
            letter-spacing: 0.5px !important;
            padding: 0.75rem 1.5rem !important;
            width: 100%;
            margin: 1rem auto !important;
        }
        
        .detect-btn:hover {
            transform: translateY(-2px) !important;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2) !important;
        }
        
        .detect-btn:active {
            transform: translateY(1px) !important;
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2) !important;
        }
        
        /* 確保標籤和內容都置中 */
        .gr-form, .gr-box, .gr-panel {
            display: flex;
            flex-direction: column;
            align-items: center; 
            width: 100%;
            margin: 0 auto;
        }
        
        /* 確保圖像上傳界面居中 */
        .upload-box {
            margin: 0 auto;
            text-align: center;
            max-width: 500px;
        }
        
        .footer {
            text-align: center;
            margin-top: 2rem;
            font-size: 0.9rem;
            color: #4A5568;
            padding: 1rem;
            background: rgba(255, 255, 255, 0.5);
            border-radius: 10px;
            width: 100%;
        }
        
        /* 中央對齊所有容器 */
        .container, .gr-container, .gr-row, .gr-col {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            width: 100%;
        }
        
        /* 改善標籤頁樣式 */
        .tabs {
            width: 100%;
            display: flex;
            justify-content: center;
        }
        
        /* 改善表單和控制項置中 */
        label, button, select, .gr-input, .gr-button, .gr-checkbox, .gr-radio, .gr-slider {
            margin-left: auto;
            margin-right: auto;
        }
        
        /* 響應式調整 */
        @media (max-width: 768px) {
            .app-title {
                font-size: 2rem;
            }
            
            .app-subtitle {
                font-size: 1rem;
            }
            
            .gradio-container {
                padding: 0.5rem;
            }
        }
        """
        return css