/* Winter Wonderland Color Palette */
:root {
  --color-white: #ffffff;
  --color-ice-blue: #a8d8e6;
  --color-soft-gray: #b2c2c6;
  --color-medium-blue: #4b8da3;
  --color-dark-navy: #2c3e50;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Arial', sans-serif;
  background: linear-gradient(135deg, #1b2b44 0%, #2e4a6d 50%, #1b2b44 100%);
  min-height: 100vh;
  padding: 2rem;
  position: relative;
  overflow-x: hidden;
}

/* Add subtle animated snow effect */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(
      circle at 50% 50%,
      transparent 0,
      rgba(255, 255, 255, 0.05) 2px,
      transparent 4px
    ),
    radial-gradient(
      circle at 30% 30%,
      transparent 0,
      rgba(255, 255, 255, 0.05) 1px,
      transparent 3px
    );
  background-size: 100px 100px, 60px 60px;
  animation: snow 20s linear infinite;
  pointer-events: none;
}

@keyframes snow {
  0% {
    transform: translateY(0);
  }
  100% {
    transform: translateY(100vh);
  }
}

main {
  max-width: 1000px;
  margin: 0 auto;
}

.header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

h1 {
  color: var(--color-white);
  font-size: 2.5rem;
  text-align: center;
  margin: 1rem 0;
}

h2 {
  color: var(--color-white);
  text-align: center;
  font-size: 1.2rem;
  margin-bottom: 2rem;
  font-weight: normal;
}

.fa-snowflake {
  color: var(--color-ice-blue);
  font-size: 2rem;
}

.calendar-wrapper {
  background-color: var(--color-ice-blue);
  padding: 2rem;
  border-radius: 1rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.calendar-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1rem;
  list-style: none;
}

.calendar-box {
  background-color: var(--color-dark-navy);
  border: 2px solid var(--color-soft-gray);
  border-radius: 0.5rem;
  padding: 1rem;
  aspect-ratio: 1;
  cursor: pointer;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  position: relative;
  perspective: 1000px;
}

/* Front and back faces of the card */
.calendar-box-face {
  position: absolute;
  width: 100%;
  height: 100%;
  left: 0;
  top: 0;
  backface-visibility: hidden;
  transition: transform 0.6s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  border-radius: 0.5rem;
}

.calendar-box-front {
  background-color: var(--color-dark-navy);
  transform: rotateY(0deg);
}

.calendar-box-back {
  background-color: var(--color-medium-blue);
  transform: rotateY(180deg);
  border: 2px solid var(--color-ice-blue);
}

/* Opened state */
.calendar-box.opened .calendar-box-front {
  transform: rotateY(-180deg);
}

.calendar-box.opened .calendar-box-back {
  transform: rotateY(0deg);
}

.calendar-box:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.calendar-box p {
  color: var(--color-white);
  margin: 0.5rem 0;
  text-align: center;
}

.calendar-box .number {
  font-size: 1.8rem;
  font-weight: bold;
}

.calendar-box .description {
  color: var(--color-soft-gray);
  font-size: 0.9rem;
}

.calendar-box i {
  color: var(--color-ice-blue);
  font-size: 1.5rem;
}

.calendar-box.opened .large-snowflake {
  animation: surprise-spin 1s ease-out;
  color: var(--color-white);
  text-shadow: 0 0 10px var(--color-ice-blue);
  font-size: 2.5rem !important;
  margin-bottom: 1rem;
}

@keyframes surprise-spin {
  0% {
    transform: scale(0) rotate(-180deg);
    opacity: 0;
  }
  100% {
    transform: scale(1) rotate(0deg);
    opacity: 1;
  }
}

.reset-button {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
  margin: 1rem 0 0; /* Changed from 2rem to 1rem to match grid gap */
  padding: 1rem;
  background-color: var(--color-dark-navy);
  color: var(--color-soft-gray);
  border: 2px solid var(--color-ice-blue);
  border-radius: 0.5rem;
  cursor: pointer;
  transition: all 0.3s ease;
  font-size: 1rem;
}

.reset-button:hover {
  background-color: var(--color-medium-blue);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.reset-button:active {
  transform: translateY(0);
}