tElementById('timeline');
            const totalMinutes = (guideEndTime - guideStartTime) / (1000 * 60);
            const totalSlots = Math.ceil(totalMinutes / 30);
            
            // Add clock in the left space (above stations column) - fixed width
            let timelineHTML = `<div class="timeline-clock" id="current-time-display"></div>`;
            
            // Calculate available width for time slots (full width minus 120px for clock)
            const slotWidth = `calc((100% - 120px) /