:root {
  --bg: #f0f2f5;
  --card-bg: #fff;
  --text: #1a1a2e;
  --card-shadow: rgba(0, 0, 0, 0.08);

  --btn-decrement-bg: #fee2e2;
  --btn-decrement-color: #b91c1c;
  --btn-decrement-hover-bg: #fecaca;
  --btn-decrement-shadow: rgba(185, 28, 28, 0.3);

  --btn-increment-bg: #dcfce7;
  --btn-increment-color: #15803d;
  --btn-increment-hover-bg: #bbf7d0;
  --btn-increment-shadow: rgba(21, 128, 61, 0.3);

  --btn-secondary-border: #cbd5e1;
  --btn-secondary-color: #64748b;
  --btn-secondary-hover-bg: #f1f5f9;
  --btn-secondary-hover-border: #94a3b8;
  --btn-secondary-hover-color: #475569;
}

[data-theme='dark'] {
  --bg: #0a0a0a;
  --card-bg: #1a1a1a;
  --text: #ebebeb;
  --card-shadow: rgba(0, 0, 0, 0.6);

  --btn-decrement-bg: #5c1a1a;
  --btn-decrement-color: #fca5a5;
  --btn-decrement-hover-bg: #7a2020;
  --btn-decrement-shadow: rgba(252, 165, 165, 0.25);

  --btn-increment-bg: #14532d;
  --btn-increment-color: #86efac;
  --btn-increment-hover-bg: #166534;
  --btn-increment-shadow: rgba(134, 239, 172, 0.25);

  --btn-secondary-border: #2e2e2e;
  --btn-secondary-color: #a0a0a0;
  --btn-secondary-hover-bg: #2e2e2e;
  --btn-secondary-hover-border: #555;
  --btn-secondary-hover-color: #c0c0c0;
}

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

body {
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--bg);
  font-family: system-ui, sans-serif;
  transition: background-color 0.3s ease;
}

.counter {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
  background: var(--card-bg);
  padding: 2rem 2.5rem;
  border-radius: 1.5rem;
  box-shadow: 0 4px 32px var(--card-shadow);
  width: min(90vw, 28rem);
  transition:
    background-color 0.3s ease,
    box-shadow 0.3s ease;
}

.counter__value {
  font-size: clamp(4.5rem, 28vw, 8rem);
  font-weight: 700;
  line-height: 1;
  color: var(--text);
  letter-spacing: -0.04em;
  min-width: 3ch;
  text-align: center;
  transition: color 0.3s ease;
}

.counter__controls {
  display: flex;
  gap: 1.25rem;
}

.btn {
  width: 4rem;
  height: 4rem;
  border: none;
  border-radius: 50%;
  font-size: 1.75rem;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  touch-action: manipulation;
  transition:
    transform 0.1s ease,
    box-shadow 0.15s ease,
    background-color 0.3s ease,
    color 0.3s ease,
    border-color 0.3s ease;
}

.counter__actions {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.btn--reset,
.btn--theme {
  width: 2.5rem;
  height: 2.5rem;
  font-size: 1.3rem;
  background: transparent;
  border: 1.5px solid var(--btn-secondary-border);
  color: var(--btn-secondary-color);
}

.theme-icon,
.btn--reset svg {
  width: 1.25rem;
  height: 1.25rem;
}

.theme-icon .sun {
  transform-origin: center center;
}

.theme-icon .sun-beams {
  transform-origin: center center;
}

[data-theme='dark'] .theme-icon .sun {
  transform: scale(1.75);
}

[data-theme='dark'] .theme-icon .sun-beams {
  opacity: 0;
  transform: rotateZ(-25deg);
}

[data-theme='dark'] #moon-circle {
  cx: 17;
}

@media (prefers-reduced-motion: no-preference) {
  .theme-icon .sun {
    transition: transform 500ms cubic-bezier(0.5, 1.25, 0.75, 1.25);
  }

  .theme-icon .sun-beams {
    transition:
      transform 500ms cubic-bezier(0.5, 1.25, 0.75, 1.25),
      opacity 500ms cubic-bezier(0.25, 0, 0.3, 1);
  }

  #moon-circle {
    transition: cx 250ms cubic-bezier(0, 0, 0, 1) 250ms;
  }

  [data-theme='dark'] .theme-icon .sun {
    transition-timing-function: cubic-bezier(0.25, 0, 0.3, 1);
    transition-duration: 250ms;
  }

  [data-theme='dark'] .theme-icon .sun-beams {
    transition-duration: 150ms;
    transition-timing-function: cubic-bezier(0.25, 0, 0.3, 1);
  }

  [data-theme='dark'] #moon-circle {
    transition-delay: 0ms;
    transition-duration: 500ms;
  }
}

@media (hover: hover) {
  .btn--reset:hover,
  .btn--theme:hover {
    background-color: var(--btn-secondary-hover-bg);
    border-color: var(--btn-secondary-hover-border);
    color: var(--btn-secondary-hover-color);
  }
}

.btn--decrement {
  background-color: var(--btn-decrement-bg);
  color: var(--btn-decrement-color);
}

.btn--increment {
  background-color: var(--btn-increment-bg);
  color: var(--btn-increment-color);
}

@media (hover: hover) {
  .btn--decrement:hover {
    background-color: var(--btn-decrement-hover-bg);
    box-shadow: 0 4px 16px var(--btn-decrement-shadow);
  }

  .btn--increment:hover {
    background-color: var(--btn-increment-hover-bg);
    box-shadow: 0 4px 16px var(--btn-increment-shadow);
  }
}

.btn:focus {
  outline: none;
}

.btn:active,
.btn--pressing {
  transform: scale(0.9);
  box-shadow: none;
}

@media (min-width: 480px) {
  .counter {
    gap: 2.5rem;
    padding: 3rem 5rem;
  }

  .counter__controls {
    gap: 1.5rem;
  }

  .counter__controls .btn {
    width: 4.5rem;
    height: 4.5rem;
    font-size: 2rem;
  }
}