Build a simple local web app called Catan Clock. Goal: a clean, attractive, phone/tablet-friendly turn timer for in-person Catan. Core features: Setup screen Add player names. Start game button. Default turn length is 60 seconds. Game screen Clearly show whose turn it is. Show a large countdown timer. Big +30 sec button. Big Next Turn button. Pause/resume button. Reset game button. Timer behavior Each turn starts at 60 seconds. Pressing +30 sec adds 30 seconds to the current turn. Pressing Next Turn moves to the next player and resets the timer to 60 seconds. Cycle through players in order. Final countdown audio When the timer reaches 15 seconds, start beeping. Beeps should get faster as the timer approaches 0. At 0, play a more obvious alert sound and visually show that time is up. Use browser audio APIs, no external sound files required. Include a way to mute/unmute sounds. Interface style Make it feel polished, not like a default demo app. Big readable typography. High contrast. Warm board-game aesthetic. Large buttons that are easy to tap across a table. Responsive layout for laptop and phone. Add small Catan-inspired visual touches