:root {
            --primary-color: #2563eb;
            --secondary-color: #1e40af;
            --background-color: #f8fafc;
            --card-background: #ffffff;
            --text-primary: #1e293b;
            --text-secondary: #64748b;
            --danger-color: #ef4444;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background-color: var(--background-color);
            color: var(--text-primary);
            line-height: 1.6;
            margin: 0;
            padding: 20px;
            min-height: 100vh;
        }

        #app {
            max-width: 800px;
            margin: 0 auto;
            background: var(--card-background);
            padding: 2rem;
            border-radius: 10px;
            box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
            animation: fadeIn 0.5s ease-out;
        }

        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }

        .header {
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 12px;
            margin-bottom: 2rem;
        }

        .header img {
            width: 40px;
            height: 40px;
            transition: transform 0.3s ease;
        }

        .header img:hover {
            transform: scale(1.1);
        }

        h1 {
            font-size: 2rem;
            color: var(--text-primary);
            margin: 0;
        }

        h2 {
            font-size: 1.5rem;
            color: #000000;
            margin: 2rem 0 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #e2e8f0;
        }

        h3 {
            text-align: center;
            color: var(--danger-color);
            margin: 1rem 0;
        }

        .source-link-container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 1rem;
            margin: 1rem 0;
        }

        .source-link {
            background: #f8fafc;
            padding: 1rem;
            border-radius: 8px;
            flex: 1;
            display: block;
            transition: all 0.3s ease;
            word-break: break-all;
        }

        .source-link:hover {
            background: #f1f5f9;
            transform: translateX(8px);
        }

        .copy-btn {
            background: var(--primary-color);
            color: white;
            border: none;
            padding: 0.75rem 1.5rem;
            border-radius: 6px;
            cursor: pointer;
            font-size: 0.95rem;
            font-weight: 600;
            transition: all 0.3s ease;
            white-space: nowrap;
            flex-shrink: 0;
        }

        .copy-btn:hover {
            background: var(--secondary-color);
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
        }

        .copy-btn:active {
            transform: translateY(0);
        }

        .copy-btn.copied {
            background: #10b981;
        }

        a {
            color: var(--primary-color);
            text-decoration: none;
            transition: color 0.3s ease;
            word-break: break-all;
        }

        a:hover {
            color: var(--secondary-color);
        }

        .source-item {
            display: flex;
            align-items: center;
            gap: 1rem;
            padding: 0.75rem;
            border-radius: 8px;
            margin: 0.5rem 0;
            background: #f8fafc;
            transition: all 0.3s ease;
        }

        .source-item:hover {
            background: #f1f5f9;
            transform: translateX(8px);
        }

        .source-item span {
            color: var(--text-secondary);
            font-size: 0.9rem;
            white-space: nowrap;
        }

        .disclaimer {
            margin-top: 2rem;
            padding: 1rem;
            background: #fee2e2;
            border-radius: 8px;
            color: var(--danger-color);
        }

        .search-section {
            background: #f8fafc;
            padding: 1.5rem;
            border-radius: 8px;
            margin: 1.5rem 0;
        }

        .search-section h4 {
            color: var(--text-secondary);
            margin-bottom: 1rem;
        }

        @media (max-width: 640px) {
            body {
                padding: 10px;
            }

            #app {
                padding: 1rem;
            }

            .source-item {
                flex-direction: column;
                align-items: flex-start;
                gap: 0.5rem;
            }

            .source-link-container {
                flex-direction: column;
                align-items: stretch;
            }

            .copy-btn {
                width: 100%;
            }
        }