:root {
            --primary-color: #e74c3c;
            --primary-hover: #c0392b;
            --secondary-color: #3498db;
            --secondary-hover: #2980b9;
            --text-color: #333;
            --light-text: #777;
            --border-color: #e0e0e0;
            --bg-color: #f8f9fa;
            --card-bg: #ffffff;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            --radius: 10px;
            --transition: all 0.3s ease;
        }

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

        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
            line-height: 1.6;
            color: var(--text-color);
            background-color: var(--bg-color);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
           
        }

        .container {
            background-color: var(--card-bg);
            padding: 2rem;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            max-width: 800px;
            margin: 20px auto;
            width: 100%;
            transition: var(--transition);
        }

        h1 {
            color: var(--primary-color);
            text-align: center;
            margin-bottom: 1.5rem;
            font-size: clamp(1.75rem, 4vw, 2.25rem);
            font-weight: 600;
            letter-spacing: 1px;
        }

        .input-group {
            margin-bottom: 1.5rem;
        }

        label {
            display: block;
            margin-bottom: 0.75rem;
            font-weight: 500;
            font-size: clamp(0.95rem, 3vw, 1.05rem);
            color: var(--text-color);
        }

        input[type="number"] {
            width: 100%;
            padding: 0.875rem 1rem;
            border: 2px solid var(--border-color);
            border-radius: var(--radius);
            font-size: clamp(0.95rem, 3vw, 1.05rem);
            transition: var(--transition);
            background-color: var(--card-bg);
        }

        input[type="number"]:focus {
            border-color: var(--primary-color);
            outline: none;
            box-shadow: 0 0 0 3px rgba(231, 76, 60, 0.2);
        }

        .button-group {
            display: flex;
            flex-wrap: wrap;
            gap: 1rem;
            justify-content: center;
            margin: 1.5rem auto;
        }

        button {
            color: white;
            border: none;
            padding: 0.875rem 1.5rem;
            font-size: clamp(0.95rem, 3vw, 1.05rem);
            border-radius: var(--radius);
            cursor: pointer;
            transition: var(--transition);
            font-weight: 500;
            letter-spacing: 0.5px;
            flex: 1;
            min-width: 150px;
            max-width: 220px;
        }

        .convert-btn {
            background-color: var(--primary-color);
        }

        .convert-btn:hover {
            background-color: var(--primary-hover);
            transform: translateY(-2px);
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
        }

        .copy-btn {
            background-color: var(--secondary-color);
            display: none;
        }

        .copy-btn:hover {
            background-color: var(--secondary-hover);
            transform: translateY(-2px);
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
        }

        button:active {
            transform: translateY(0);
        }

        .result-container {
            margin-top: 1.5rem;
            opacity: 0;
            height: 0;
            overflow: hidden;
            transition: all 0.4s ease;
        }

        .result-container.show {
            opacity: 1;
            height: auto;
        }

        .result {
            padding: 1.25rem;
            background-color: var(--bg-color);
            border-radius: var(--radius);
            border-left: 4px solid var(--primary-color);
            position: relative;
        }

        .result-title {
            font-weight: 500;
            margin-bottom: 0.75rem;
            font-size: clamp(0.95rem, 3vw, 1.05rem);
            color: var(--primary-color);
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .result-content {
            font-size: clamp(1.1rem, 3.5vw, 1.3rem);
            color: var(--text-color);
            word-break: break-word;
            line-height: 1.7;
            padding-right: 30px;
        }

        .copy-icon {
            cursor: pointer;
            color: var(--secondary-color);
            font-size: 1.2rem;
            transition: var(--transition);
        }

        .copy-icon:hover {
            color: var(--secondary-hover);
            transform: scale(1.1);
        }

        .copy-success {
            position: absolute;
            top: 10px;
            right: 10px;
            background-color: rgba(46, 204, 113, 0.9);
            color: white;
            padding: 5px 10px;
            border-radius: 4px;
            font-size: 0.8rem;
            opacity: 0;
            transition: opacity 0.3s;
        }

        .copy-success.show {
            opacity: 1;
        }

        .tips {
            margin-top: 2rem;
            font-size: clamp(0.85rem, 2.5vw, 0.95rem);
            color: var(--light-text);
            border-top: 1px solid var(--border-color);
            padding-top: 1.25rem;
        }

        .tips p {
            margin: 0.5rem 0;
        }

        .tips strong {
            color: var(--text-color);
        }

        /* 动画效果 */
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(10px); }
            to { opacity: 1; transform: translateY(0); }
        }

        .fade-in {
            animation: fadeIn 0.5s ease forwards;
        }

        /* 针对小屏幕的调整 */
        @media (max-width: 600px) {
            body {
                padding: 15px;
            }
            
            .container {
                padding: 1.5rem;
            }
            
            .button-group {
                flex-direction: column;
                gap: 0.75rem;
            }
            
            button {
                max-width: 100%;
                width: 100%;
            }
            
            .result {
                padding: 1rem;
            }
        }

        @media (max-width: 400px) {
            .container {
                padding: 1.25rem;
            }
            
            h1 {
                font-size: 1.5rem;
            }
        }