Countdown Timer

A simple and stylish countdown timer made using HTML, CSS, and JavaScript. Enter a time in seconds, and watch the countdown in action! 🛠 Features -> ✅ Input validation (no negative or empty values) -> ⏳ Smooth countdown with real-time updates -> 🔊 Ticking sound while timer runs, alert sound when time is up -> 🎯 Stylish circular timer display -> 📱 Fully responsive layout -> ⚠️ Clear error messages for invalid input