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

body {
  font-family: 'Georgia', serif;
  background: linear-gradient(135deg, #1a3a3a 0%, #0f2020 100%);
  color: #ffffff;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  position: relative;
  overflow: hidden;
}

/* snowflake animation */
@keyframes fall {
  to {
    transform: translateY(100vh) translateX(100px);
    opacity: 0;
  }
}

.snowflake {
  position: fixed;
  top: -10px;
  color: #fff;
  font-size: 1.5em;
  opacity: 0.8;
  animation: fall linear infinite;
  pointer-events: none;
  text-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
}

.container {
  width: 100%;
  max-width: 900px;
}

.header {
  text-align: center;
  margin-bottom: 60px;
  z-index: 10;
  position: relative;
}

.header h1 {
  font-size: 3.5rem;
  margin-bottom: 10px;
  color: #c41e3a;
  text-shadow: 0 0 20px rgba(196, 30, 58, 0.5);
  letter-spacing: 2px;
}

.header p {
  font-size: 1.2rem;
  color: #90ee90;
  font-style: italic;
  text-shadow: 0 0 10px rgba(144, 238, 144, 0.3);
}

/* scroll container */
.scroll-container {
  position: relative;
  width: 100%;
  overflow: hidden;
  background: rgba(15, 32, 32, 0.6);
  border-radius: 20px;
  padding: 40px 20px;
  backdrop-filter: blur(10px);
  border: 2px solid rgba(196, 30, 58, 0.3);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

/* columns in the scroll container */
.columns-wrapper {
  display: flex;
  gap: 20px;
  scroll-behavior: smooth;
  overflow-x: auto;
  scrollbar-width: none;
  padding: 20px 0;
}

.columns-wrapper::-webkit-scrollbar {
  display: none;
}

/* column styling */
.column {
  flex: 0 0 250px;
  background: linear-gradient(
    135deg,
    rgba(196, 30, 58, 0.2) 0%,
    rgba(144, 238, 144, 0.2) 100%
  );
  border: 2px solid rgba(196, 30, 58, 0.5);
  border-radius: 15px;
  padding: 30px 20px;
  text-align: center;
  transition: all 0.3s ease;
  cursor: pointer;
  min-height: 300px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.column::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.1),
    transparent
  );
  transition: left 0.5s ease;
}

.column:hover::before {
  left: 100%;
}

.column:hover {
  transform: translateY(-10px) scale(1.05);
  border-color: #c41e3a;
  box-shadow: 0 10px 30px rgba(196, 30, 58, 0.4);
  background: linear-gradient(
    135deg,
    rgba(196, 30, 58, 0.3) 0%,
    rgba(144, 238, 144, 0.3) 100%
  );
}

.column.target-current {
  border-color: #90ee90;
  box-shadow: 0 0 30px rgba(144, 238, 144, 0.6),
    inset 0 0 20px rgba(144, 238, 144, 0.2);
  transform: scale(1.08);
}

.column-icon {
  font-size: 4rem;
  margin-bottom: 15px;
  display: block;
}

.column-title {
  font-size: 1.3rem;
  margin-bottom: 10px;
  color: #90ee90;
  font-weight: bold;
}

.column-text {
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.8);
  line-height: 1.5;
}

/* scroll buttons */
.scroll-button {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: linear-gradient(135deg, #c41e3a 0%, #a01830 100%);
  border: none;
  color: white;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
  z-index: 20;
  box-shadow: 0 4px 15px rgba(196, 30, 58, 0.4);
}

.scroll-button:hover {
  background: linear-gradient(135deg, #e0243f 0%, #c41e3a 100%);
  box-shadow: 0 6px 20px rgba(196, 30, 58, 0.6);
  transform: translateY(-50%) scale(1.1);
}

.scroll-button:active {
  transform: translateY(-50%) scale(0.95);
}

.scroll-button.prev {
  left: 10px;
}

.scroll-button.next {
  right: 10px;
}

.scroll-button:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

/* scroll marker group */
.scroll-marker-group {
  display: flex;
  gap: 10px;
  justify-content: center;
  margin-top: 40px;
  flex-wrap: wrap;
}

/* scroll marker styling */
.scroll-marker {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: rgba(144, 238, 144, 0.3);
  cursor: pointer;
  border: 2px solid rgba(144, 238, 144, 0.5);
  transition: all 0.3s ease;
}

.scroll-marker:hover {
  transform: scale(1.3);
  background: rgba(144, 238, 144, 0.6);
}

.scroll-marker.target-current {
  width: 16px;
  height: 16px;
  background: #90ee90;
  border-color: #c41e3a;
  box-shadow: 0 0 15px rgba(144, 238, 144, 0.8);
  transform: scale(1.2);
}

@media (max-width: 768px) {
  .header h1 {
    font-size: 2.5rem;
  }

  .column {
    flex: 0 0 180px;
    min-height: 250px;
  }

  .scroll-button {
    width: 40px;
    height: 40px;
    font-size: 18px;
  }
}