:root {
  --background: #f8f6f7;
  --text: #2d2930;
  --subtext: #77727a;
  --pink: #ff4f8b;
  --pink-dark: #e93d77;
  --line: #ded9de;
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  display: grid;
  place-items: center;
  padding: 24px;
  background-color: var(--background);
  color: var(--text);
  font-family: Arial, sans-serif;
}

.game-box {
  width: min(100%, 440px);
  padding: 42px 40px;
  text-align: center;
  background: #fff;
  border-radius: 20px;
  box-shadow: 0 8px 30px rgba(45, 41, 48, 0.08);
}

.game-box.game-lost {
  animation: shake 0.45s ease-in-out;
}

.game-box.game-lost input {
  border-color: #e85b71;
}

.game-box.game-lost #message {
  color: #d9435d;
}

@keyframes shake {
  0%, 100% {
    transform: translateX(0);
  }

  20%, 60% {
    transform: translateX(-8px);
  }

  40%, 80% {
    transform: translateX(8px);
  }
}

h1 {
  margin: 0 0 10px;
  font-size: clamp(1.5rem, 5vw, 1.8rem);
  letter-spacing: 0.03em;
}

.description {
  margin: 0 0 28px;
  color: var(--subtext);
}

input {
  display: block;
  width: 126px;
  margin: 0 auto;
  padding: 13px;
  border: 2px solid var(--line);
  border-radius: 10px;
  outline: none;
  color: var(--text);
  font-size: 1.35rem;
  text-align: center;
}

/* 숫자 입력창의 위·아래 화살표를 숨깁니다. */
input::-webkit-outer-spin-button,
input::-webkit-inner-spin-button {
  margin: 0;
  -webkit-appearance: none;
}

input[type="number"] {
  -moz-appearance: textfield;
  appearance: textfield;
}

input:focus {
  border-color: var(--pink);
}

button {
  margin: 15px 0 0;
  padding: 13px 24px;
  border: 0;
  border-radius: 10px;
  background-color: var(--pink);
  color: #fff;
  font-size: 1rem;
  cursor: pointer;
  transition: background-color 0.2s, transform 0.2s;
}

button:hover:not(:disabled) {
  background-color: var(--pink-dark);
  transform: translateY(-1px);
}

button:focus-visible {
  outline: 3px solid rgba(255, 79, 139, 0.3);
  outline-offset: 3px;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

#message {
  min-height: 52px;
  margin: 27px 0 10px;
  color: var(--pink);
  font-size: 1.1rem;
  font-weight: bold;
  line-height: 1.45;
}

#chances {
  margin: 8px 0;
  color: var(--subtext);
  font-size: 0.9rem;
  line-height: 1.5;
}

.restart {
  display: none;
  background-color: var(--text);
}

.restart:hover:not(:disabled) {
  background-color: #4a444c;
}

#confettiContainer {
  position: fixed;
  inset: 0;
  z-index: 10;
  pointer-events: none;
  overflow: hidden;
}

.confetti {
  position: absolute;
  top: 42%;
  left: 50%;
  width: 5px;
  height: 8px;
  background-color: var(--confetti-color);
  animation: confetti-pop 1.5s ease-out forwards;
}

@keyframes confetti-pop {
  from {
    opacity: 1;
    transform: translate(-50%, -50%) rotate(0deg);
  }

  to {
    opacity: 0;
    transform: translate(calc(-50% + var(--move-x)), calc(-50% + var(--move-y))) rotate(var(--rotate));
  }
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 480px) {
  body {
    padding: 16px;
  }

  .game-box {
    padding: 34px 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .confetti,
  .game-box.game-lost {
    animation-duration: 0.01ms;
  }
}