:root {
  --courier-game-blue: #0055a4;
  --courier-game-yellow: #ffd900;
  --courier-game-bg: linear-gradient(to bottom, #e0f0ff, #ffffff);
  --courier-game-surface: #ffffff;
  --courier-game-overlay: rgba(0, 85, 164, 0.88);
  --courier-game-shadow: rgba(0, 0, 0, 0.12);
  --courier-game-text: #333333;
  --courier-game-height: 100vh;
}

body.courier-game-active {
  overflow: hidden;
}

.courier-game-overlay {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: none;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.35);
  padding: 16px;
  box-sizing: border-box;
}

.courier-game-overlay.is-visible {
  display: flex;
}

.courier-game {
  width: min(100%, 500px);
  height: var(--courier-game-height);
  max-height: 820px;
  background: var(--courier-game-surface);
  border: 2px solid var(--courier-game-blue);
  border-radius: 16px;
  box-shadow: 0 18px 34px var(--courier-game-shadow);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  touch-action: none;
  user-select: none;
}

.courier-game__ui {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(6px);
  z-index: 2;
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  flex-shrink: 0;
}

.courier-game__score {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--courier-game-text);
}

.courier-game__score span {
  color: var(--courier-game-blue);
}

.courier-game__lives {
  display: flex;
  gap: 6px;
}

.courier-game__life {
  width: 26px;
  height: 26px;
  background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="%230055A4"><path d="M20 6h-4V4c0-1.11-.89-2-2-2h-4c-1.11 0-2 .89-2 2v2H4c-1.11 0-1.99.89-1.99 2L2 19c0 1.11.89 2 2 2h16c1.11 0 2-.89 2-2V8c0-1.11-.89-2-2-2zm-6 0h-4V4h4v2z"/></svg>');
  background-size: contain;
  background-repeat: no-repeat;
  transition: transform 0.28s ease, opacity 0.28s ease;
}

.courier-game__life.is-lost {
  transform: scale(0);
  opacity: 0;
}

.courier-game__close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: none;
  background: rgba(0, 0, 0, 0.05);
  color: var(--courier-game-text);
  font-size: 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s ease;
}

.courier-game__close:hover,
.courier-game__close:focus-visible {
  background: rgba(0, 0, 0, 0.12);
  outline: none;
}

.courier-game__area {
  position: relative;
  flex: 1;
  background: var(--courier-game-bg);
  overflow: hidden;
}

.courier-game__player {
  position: absolute;
  width: 82px;
  height: 52px;
  background: var(--courier-game-blue);
  border-radius: 10px;
  border: 3px solid var(--courier-game-yellow);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.4rem;
  bottom: 18px;
  left: calc(50% - 41px);
  color: var(--courier-game-yellow);
  box-shadow: 0 4px 10px rgba(0, 85, 164, 0.25);
}

.courier-game__player::before {
  content: 'M';
}

.courier-game__box {
  position: absolute;
  width: 52px;
  height: 52px;
  border-radius: 6px;
  background-color: #c5a880;
  background-image:
    linear-gradient(var(--courier-game-blue), var(--courier-game-blue)),
    linear-gradient(var(--courier-game-yellow), var(--courier-game-yellow));
  background-size: 100% 12px, 12px 100%;
  background-repeat: no-repeat;
  background-position: center, center;
  will-change: transform;
  box-shadow: 0 6px 10px rgba(0, 0, 0, 0.12);
}

.courier-game__message {
  position: absolute;
  inset: 0;
  background: var(--courier-game-overlay);
  color: #ffffff;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px;
  text-align: center;
  gap: 16px;
  z-index: 3;
  transition: opacity 0.3s ease;
}

.courier-game__message.is-hidden {
  opacity: 0;
  pointer-events: none;
}

.courier-game__message h2 {
  margin: 0;
  font-size: 2.4rem;
  text-shadow: 2px 2px 6px rgba(0, 0, 0, 0.35);
}

.courier-game__message p {
  margin: 0;
  font-size: 1.1rem;
  line-height: 1.4;
}

.courier-game__start {
  padding: 14px 30px;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--courier-game-blue);
  background: var(--courier-game-yellow);
  border-radius: 10px;
  border: none;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.courier-game__start:hover,
.courier-game__start:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 10px 18px rgba(255, 217, 0, 0.32);
  outline: none;
}

@media (max-width: 480px) {
  .courier-game__ui {
    padding: 12px;
  }

  .courier-game__score {
    font-size: 1.05rem;
  }

  .courier-game__player {
    width: 70px;
    height: 46px;
    left: calc(50% - 35px);
    font-size: 1.25rem;
  }

  .courier-game__box {
    width: 46px;
    height: 46px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .courier-game__life,
  .courier-game__start {
    transition: none;
  }
}