* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            padding: 40px 20px;
        }
        .container {
            max-width: 1000px;
            margin: 0 auto;
            background: white;
            border-radius: 20px;
            padding: 40px;
            box-shadow: 0 20px 60px rgba(0,0,0,0.3);
        }
        h1 {
            text-align: center;
            color: #333;
            margin-bottom: 30px;
            font-size: 2em;
        }
        .input-group {
            margin-bottom: 20px;
        }
        label {
            display: block;
            margin-bottom: 8px;
            color: #555;
            font-weight: 600;
        }
        input[type="text"], textarea {
            width: 100%;
            padding: 12px;
            border: 2px solid #e0e0e0;
            border-radius: 8px;
            font-size: 14px;
            font-family: 'Courier New', monospace;
            transition: border-color 0.3s;
        }
        input:focus, textarea:focus {
            outline: none;
            border-color: #667eea;
        }
        textarea {
            min-height: 150px;
            resize: vertical;
        }
        .flags {
            display: flex;
            gap: 15px;
            flex-wrap: wrap;
        }
        .flag-item {
            display: flex;
            align-items: center;
            gap: 5px;
        }
        .flag-item input[type="checkbox"] {
            width: 18px;
            height: 18px;
            cursor: pointer;
        }
        .results {
            background: #f9f9f9;
            padding: 20px;
            border-radius: 12px;
            margin: 20px 0;
        }
        .match-info {
            background: white;
            padding: 15px;
            border-radius: 8px;
            margin-bottom: 15px;
        }
        .match-count {
            font-size: 1.2em;
            font-weight: bold;
            color: #667eea;
            margin-bottom: 10px;
        }
        .match-item {
            background: #e7f3ff;
            padding: 10px;
            border-left: 4px solid #667eea;
            margin-bottom: 10px;
            border-radius: 4px;
        }
        .match-text {
            font-family: 'Courier New', monospace;
            font-weight: bold;
            color: #333;
        }
        .match-position {
            font-size: 0.9em;
            color: #666;
            margin-top: 5px;
        }
        .highlighted-text {
            background: white;
            padding: 15px;
            border-radius: 8px;
            font-family: 'Courier New', monospace;
            line-height: 1.8;
            white-space: pre-wrap;
            word-break: break-word;
        }
        .highlight {
            background: #ffeb3b;
            padding: 2px 4px;
            border-radius: 3px;
            font-weight: bold;
        }
        .error {
            background: #f8d7da;
            color: #721c24;
            padding: 15px;
            border-radius: 8px;
            border-left: 4px solid #f5c6cb;
        }
        button {
            width: 100%;
            padding: 14px;
            background: linear-gradient(135deg, #95a5a6 0%, #7f8c8d 100%);
            color: white;
            border: none;
            border-radius: 8px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: transform 0.2s;
            margin-top: 20px;
        }
        button:hover {
            transform: translateY(-2px);
        }