(function(){
      const timerEl = document.getElementById('timer');
      const daysEl = document.getElementById('days');
      const hoursEl = document.getElementById('hours');
      const minutesEl = document.getElementById('minutes');
      const secondsEl = document.getElementById('seconds');

      function nowCST() {
        const now = new Date();
        return new Date(now.toLocaleString('en-US', { timeZone: 'America/Chicago' }));
      }

      function nextEvent(dayOfWeek) {
        const cst = nowCST();
        const target = new Date(cst);
        target.setDate(target.getDate() + ((dayOfWeek - target.getDay() + 7) % 7));
        target.setHours(11,0,0,0);
        return target;
      }

      function getModeAndTarget() {
        const cstNow = nowCST();
        const satStart = nextEvent(6);
        const sunStart = nextEvent(0);
        const satEnd = new Date(satStart); satEnd.setHours(18,0,0,0);
        const sunEnd = new Date(sunStart); sunEnd.setHours(18,0,0,0);

        if (cstNow >= satStart && cstNow < satEnd) return { mode: 'event', target: satEnd };
        if (cstNow >= sunStart && cstNow < sunEnd) return { mode: 'event', target: sunEnd };

        const candidates = [satStart, sunStart].filter(t => t > cstNow);
        if (candidates.length === 0) { satStart.setDate(satStart.getDate()+7); candidates.push(satStart); }
        candidates.sort((a,b)=>a-b);
        return { mode: 'countdown', target: candidates[0] };
      }

      function pad(n, digits = 2) { return String(n).padStart(digits,'0'); }

      function update() {
        const { mode, target } = getModeAndTarget();
        const cstNow = nowCST();
        let diff = target - cstNow;
        if (diff < 0) diff = 0;

        const seconds = Math.floor((diff / 1000) % 60);
        const minutes = Math.floor((diff / (1000*60)) % 60);
        const hours = Math.floor((diff / (1000*60*60)) % 24);
        const days = Math.floor(diff / (1000*60*60*24));

        daysEl.textContent = String(days);
        hoursEl.textContent = pad(hours);
        minutesEl.textContent = pad(minutes);
        secondsEl.textContent = pad(seconds);

        if (mode === 'event') timerEl.classList.add('rainbow');
        else timerEl.classList.remove('rainbow');
      }

      update();
      setTimeout(function(){ update(); setInterval(update,1000); }, 1000 - (Date.now()%1000));
    })();