:root {
            --primary-color: #2c3e50;
            --accent-color: #3498db;
            --success-color: #27ae60;
            --warning-color: #e67e22;
            --danger-color: #e74c3c;
            --light-gray: #f5f7fa;
            --medium-gray: #ddd;
            --dark-gray: #7f8c8d;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            --radius: 8px;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        body {
            background-color: #f9fafb;
            color: var(--primary-color);
            min-height: 100vh;
            padding: 2rem 1rem;
        }

        .container {
            max-width: 800px;
            margin: 0 auto;
            background: white;
            padding: 2.5rem;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
        }

        header {
            text-align: center;
            margin-bottom: 2rem;
        }

        h1 {
            color: var(--primary-color);
            margin-bottom: 0.5rem;
            font-weight: 600;
            font-size: 1.8rem;
        }

        .subtitle {
            color: var(--dark-gray);
            font-size: 1rem;
            max-width: 600px;
            margin: 0 auto;
        }

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

        input,
        button {
            width: 100%;
            padding: 0.9rem 1.2rem;
            border-radius: var(--radius);
            font-size: 1rem;
            transition: all 0.3s ease;
        }

        #githubUrl {
            border: 1px solid var(--medium-gray);
            background-color: var(--light-gray);
            color: var(--primary-color);
        }

        #githubUrl:focus {
            outline: none;
            border-color: var(--accent-color);
            box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
        }

        .button-group {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1rem;
            margin-bottom: 1.5rem;
        }

        button {
            border: none;
            cursor: pointer;
            font-weight: 500;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            position: relative;
            overflow: hidden;
        }

        #convertBtn {
            background-color: var(--accent-color);
            color: white;
        }

        #convertBtn:hover {
            background-color: #2980b9;
        }

        #copyBtn {
            background-color: var(--primary-color);
            color: white;
        }

        #copyBtn:hover {
            background-color: #1a252f;
        }

        #copyBtn.copied {
            background-color: var(--success-color);
        }

        #downloadBtn {
            background-color: var(--success-color);
            color: white;
            width: 100%;
            margin-bottom: 1.5rem;
        }

        #downloadBtn:hover {
            background-color: #219653;
        }

        #downloadBtn:disabled {
            background-color: var(--medium-gray);
            cursor: not-allowed;
        }

        .result-container {
            border-radius: var(--radius);
            border: 1px solid var(--medium-gray);
            overflow: hidden;
            transition: all 0.3s ease;
        }

        .result-header {
            background-color: var(--light-gray);
            padding: 0.8rem 1.2rem;
            font-weight: 500;
            border-bottom: 1px solid var(--medium-gray);
        }

        #result {
            padding: 1.2rem;
            min-height: 60px;
            word-break: break-all;
            line-height: 1.5;
        }

        .status-message {
            padding: 1rem;
            border-radius: var(--radius);
            margin-bottom: 1.5rem;
            display: none;
        }

        .success {
            background-color: rgba(39, 174, 96, 0.1);
            color: var(--success-color);
            display: block;
        }

        .error {
            background-color: rgba(231, 76, 60, 0.1);
            color: var(--danger-color);
            display: block;
        }

        .info {
            background-color: rgba(52, 152, 219, 0.1);
            color: var(--accent-color);
            display: block;
        }

        .progress-container {
            height: 4px;
            background-color: var(--light-gray);
            border-radius: 2px;
            margin-bottom: 1.5rem;
            overflow: hidden;
            display: none;
        }

        .progress-bar {
            height: 100%;
            background-color: var(--accent-color);
            width: 0%;
            transition: width 0.3s ease;
        }

        footer {
            text-align: center;
            margin-top: 2rem;
            color: var(--dark-gray);
            font-size: 0.9rem;
        }

        .open-source {
            margin-top: 0.5rem;
            color: var(--accent-color);
        }

        .open-source a {
            color: var(--accent-color);
            text-decoration: none;
        }

        .open-source a:hover {
            text-decoration: underline;
        }

        .copy-feedback {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: center;
            background-color: var(--success-color);
            color: white;
            transform: translateY(-100%);
            transition: transform 0.3s ease;
        }

        .copy-feedback.show {
            transform: translateY(0);
        }

        @media (max-width: 600px) {
            .container {
                padding: 1.5rem;
            }

            .button-group {
                grid-template-columns: 1fr;
            }

            h1 {
                font-size: 1.5rem;
            }
        }