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

:root {
  --primary-color: #4f46e5;
  --error-color: #ff5a5f;
  --text-color: #2d3748;
  --secondary-text: #718096;
  --disabled-text: #cbd5e0;
  --background-hover: #edf2f7;
  --range-background: #ebf8ff;
  --range-hover: #bee3f8;
  --today-border: #68d391;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1),
    0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.calendar-container {
  margin: 30px auto;
  background: white;
  border-radius: 16px;
  box-shadow: var(--shadow);
  max-width: 340px;
  width: 100%;
  font-family: Fira Code, monospace;
}

.calendar-header {
  padding: 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.calendar-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-color);
  letter-spacing: 0.025em;
}

.calendar-title::first-letter {
  text-transform: uppercase;
}

.calendar-nav {
  display: flex;
  gap: 12px;
}

.calendar-nav-button {
  background: none;
  border: none;
  padding: 6px;
  cursor: pointer;
  color: var(--secondary-text);
  border-radius: 8px;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
}

.calendar-nav-button:hover {
  background-color: var(--background-hover);
  color: var(--primary-color);
  transform: scale(1.1);
}

.calendar-grid {
  padding: 0 10px;
  display: grid;
  grid-template-columns: repeat(7, 1fr);

}

.calendar-day-header {
  text-align: center;
  font-size: 13px;
  color: var(--secondary-text);
  padding: 8px 0;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.calendar-day {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  cursor: pointer;
  border-radius: 50%;
  transition: var(--transition);
  width: 100%;
  aspect-ratio: 1 / 1; 
  margin: 2px auto;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-color);
  transition: 
    all 0.3s cubic-bezier(0.4, 0, 0.2, 1),
    border-radius 0.3s ease,
    background-color 0.3s ease;
  transform-origin: center;
  will-change: transform, border-radius, background-color; 
}

.calendar-day:hover {
  background-color: var(--background-hover);

}

.calendar-day.selected {
  background-color: var(--primary-color);
  color: white;
  font-weight: 600;

}

.calendar-day.in-range {
  border-radius: 0;
  background-color: var(--range-background);
  color: var(--primary-color);
    transition: 
    background-color 0.3s ease,
    border-radius 0.3s ease,
    color 0.3s ease;
  animation: scaleIn 0.3s ease-out forwards;
}

.calendar-day.in-range:hover {
  background-color: var(--range-hover);
}

.calendar-day.range-start {
  background-color: var(--primary-color);
  color: white;
  border-radius: 25% 0 0 25%;
    animation: scaleStart 0.3s ease-out forwards;
}

.calendar-day.range-end {
  background-color: var(--primary-color);
  color: white;
  border-radius: 0 25% 25% 0;
    animation: scaleEnd 0.3s ease-out forwards;
}

.calendar-day.weekend {
  color: var(--error-color);
}

.calendar-day.weekend:hover {
  background-color: rgba(255, 90, 95, 0.1);
}

.calendar-day.weekend.selected,
.calendar-day.weekend.range-start,
.calendar-day.weekend.range-end {
  background-color: var(--error-color);
  color: white;
}

.calendar-day.weekend.in-range {
  background-color: rgba(255, 90, 95, 0.1);
  color: var(--error-color);
}

.calendar-day.today {
  border: 2px solid var(--primary-color);
  font-weight: 600;
}

.calendar-day.today.weekend {
  border-color: var(--error-color);
}

.calendar-day.today.in-range {
  border-color: var(--primary-color);
}

.calendar-day.other-month {
  color: var(--disabled-text);
  opacity: 0.7;
}

.calendar-day.other-month.weekend {
  color: rgba(255, 90, 95, 0.4);
}

.calendar-day.other-month.in-range {
  background-color: rgba(59, 130, 246, 0.1);
  color: var(--disabled-text);
}

.calendar-day.other-month.weekend.in-range {
  background-color: rgba(255, 90, 95, 0.1);
}

.event-indicators {
  position: absolute;
  bottom: 16%;
  left: 0;
  right: 0;
  display: flex;
  justify-content: center;
  gap: 2px;
}

.event-dot {
  width: 3px;
  height: 3px;
  background-color: var(--primary-color);
  border-radius: 50%;
  opacity: 0.8;
}

.event-more {
  font-size: 9px;
  color: var(--primary-color);
  font-weight: 600;
  margin-top: 1px;
}

.calendar-day.selected .event-dot,
.calendar-day.range-start .event-dot,
.calendar-day.range-end .event-dot,
.calendar-day.in-range .event-dot {
  background-color: white;
}

.calendar-day.weekend .event-dot,
.calendar-day.weekend.in-range .event-dot {
  background-color: var(--error-color);
}

.calendar-day.other-month .event-dot {
  background-color: var(--disabled-text);
}

.calendar-day.other-month.weekend .event-dot {
  background-color: rgba(255, 90, 95, 0.4);
}

.calendar-day.selected.in-range.weekend .event-dot {
  background: var(--error-color);
}
.calendar-day.selected.in-range .event-dot {
  background: var(--primary-color);
}

.calendar-day.in-range {
  animation: scaleIn 0.3s ease-out forwards;
}

.calendar-day:not(.in-range):not(.range-start):not(.range-end) {
  animation: scaleOut 0.3s ease-in forwards;
}

.calendar-day.range-start {
  animation: scaleStart 0.3s ease-out forwards;
}

.calendar-day.range-end {
  animation: scaleEnd 0.3s ease-out forwards;
}

@keyframes scaleIn {
  0% {
    border-radius: 50%;
    transform: scale(0.95);
  }
  100% {
    border-radius: 0;
    transform: scale(1);
  }
}

@keyframes scaleOut {
  0% {
    border-radius: 0;
    transform: scale(1);
  }
  100% {
    border-radius: 50%;
    transform: scale(0.95);
  }
}

@keyframes scaleStart {
  0% {
    border-radius: 50%;
    transform: scale(0.95);
  }
  50% {
    border-radius: 0;
    transform: scale(1.05);
  }
  100% {
    border-radius: 25% 0 0 25%;
    transform: scale(1);
  }
}

@keyframes scaleEnd {
  0% {
    border-radius: 50%;
    transform: scale(0.95);
  }
  50% {
    border-radius: 0;
    transform: scale(1.05);
  }
  100% {
    border-radius: 0 25% 25% 0;
    transform: scale(1);
  }
}

.event-dot {
  transition: all 0.3s ease;
}

.calendar-day:hover {
  transform: scale(1.05);
  transition: all 0.2s ease;
}