*, *::before, *::after {
  box-sizing: border-box;
}

body {
  font-family: system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  margin: 0;
  background: linear-gradient(135deg, #1e1b4b, #312e81);
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 40px 20px;
}

.calendar-scene {
  display: flex;
  align-items: center;
  gap: 40px;
  perspective: 1200px;
  width: 100%;
  max-width: 1000px;
}

.calendar-board {
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 24px;
  padding: 30px;
  flex-grow: 1;
  box-shadow: 0 30px 60px rgba(0, 0, 0, 0.4);
  transform: rotateY(15deg) rotateX(5deg);
  transition: transform 0.5s ease;
}

.calendar-board:hover {
  transform: rotateY(0deg) rotateX(0deg);
}

.board-header h2 {
  color: #ffffff;
  margin: 0 0 20px 0;
  font-size: 2rem;
  letter-spacing: 1px;
}

.weekdays {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  text-align: center;
  color: #818cf8;
  font-weight: 600;
  margin-bottom: 16px;
}

.days-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 12px;
}

.cal-day {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.05);
  aspect-ratio: 1 / 1;
  border-radius: 12px;
  display: flex;
  justify-content: center;
  align-items: center;
  color: #ffffff;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.cal-day:hover {
  background: rgba(99, 102, 241, 0.8);
  transform: scale(1.1) translateZ(20px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.3);
}

.cal-day.active {
  background: #ffffff;
  color: #312e81;
  font-weight: 800;
  transform: scale(1.1) translateZ(20px);
}

.event-panel {
  width: 320px;
  background: #ffffff;
  border-radius: 24px;
  padding: 30px;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.3);
}

.event-panel h3 {
  margin: 0 0 5px 0;
  color: #1e1b4b;
  font-size: 1.5rem;
}

#selected-date-text {
  color: #6366f1;
  font-weight: 600;
  margin-top: 0;
  margin-bottom: 30px;
}

.event-card {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  padding: 16px;
  border-radius: 12px;
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 16px;
  transition: transform 0.2s;
}

.event-card:hover {
  transform: translateX(5px);
  border-color: #cbd5e1;
}

.event-dot {
  width: 12px;
  height: 12px;
  background: #6366f1;
  border-radius: 50%;
  margin-top: 4px;
}

.event-dot.green {
  background: #10b981;
}

.event-card h4 {
  margin: 0 0 4px 0;
  color: #1e293b;
  font-size: 1.05rem;
}

.time {
  margin: 0;
  color: #64748b;
  font-size: 0.85rem;
}

@media (max-width: 900px) {
  .calendar-scene {
    flex-direction: column;
    perspective: none;
  }
  .calendar-board {
    transform: none;
  }
  .calendar-board:hover {
    transform: none;
  }
  .event-panel {
    width: 100%;
  }
}

const grid = document.getElementById("days-grid");
const dateText = document.getElementById("selected-date-text");

/* Total days to generate */
const daysInMonth = 31;

/* Create an active tracking variable to manage state safely */
let currentlyActive = null;

for (let i = 1; i <= daysInMonth; i++) {
  const dayBtn = document.createElement("div");
  dayBtn.className = "cal-day";
  dayBtn.innerText = i;
  
  dayBtn.addEventListener("click", function() {
    /* Clear previously active class */
    if (currentlyActive !== null) {
      currentlyActive.classList.remove("active");
    }
    
    /* Set new active class */
    dayBtn.classList.add("active");
    currentlyActive = dayBtn;
    
    /* Update Panel Text */
    dateText.innerText = "October " + i + ", 2026";
  });
  
  grid.appendChild(dayBtn);
}

/* Simulate clicking the 15th to show initial state */
setTimeout(function() {
  const day15 = grid.children.item(14);
  if (day15) {
    day15.click();
  }
}, 500);