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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background: linear-gradient(135deg, #0f0c29, #302b63, #24243e);
  color: #fff;
  overflow: hidden;
}

#app {
  width: 100%;
  max-width: 480px;
  padding: 20px;
  position: relative;
}

.screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  animation: fadeIn 0.4s ease;
}

.hidden {
  display: none !important;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* 开始界面 */
#start-screen h1 {
  font-size: 3em;
  margin-bottom: 10px;
  text-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

.subtitle {
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 30px;
  font-size: 1.1em;
}

.rules {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 16px;
  padding: 20px 28px;
  margin-bottom: 30px;
  text-align: left;
}

.rules p {
  padding: 6px 0;
  font-size: 1.05em;
  color: rgba(255, 255, 255, 0.85);
}

button {
  padding: 14px 48px;
  font-size: 1.15em;
  font-weight: 700;
  border: none;
  border-radius: 14px;
  background: linear-gradient(135deg, #f7971e, #ffd200);
  color: #1a1a2e;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: 0 6px 20px rgba(247, 151, 30, 0.35);
}

button:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 28px rgba(247, 151, 30, 0.5);
}

button:active {
  transform: translateY(0);
}

/* 游戏界面 */
.top-bar {
  display: flex;
  gap: 16px;
  margin-bottom: 20px;
  width: 100%;
  justify-content: center;
}

.stat {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.15);
  padding: 8px 18px;
  border-radius: 12px;
  font-size: 0.95em;
  font-weight: 600;
}

.stat span {
  color: #ffd200;
}

.prompt {
  font-size: 1.4em;
  font-weight: 700;
  margin-bottom: 28px;
  min-height: 42px;
  text-align: center;
}

/* 盒子 */
.boxes {
  display: flex;
  gap: 32px;
  margin-bottom: 32px;
}

.box {
  width: 140px;
  height: 160px;
  perspective: 600px;
  cursor: pointer;
}

.box.disabled {
  pointer-events: none;
}

.box-front,
.box-back {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  border-radius: 20px;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 4.5em;
  backface-visibility: hidden;
  transition: transform 0.5s ease;
}

.box {
  position: relative;
}

.box-front {
  background: linear-gradient(145deg, #4a3f8a, #6c5ce7);
  border: 3px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 8px 24px rgba(108, 92, 231, 0.4);
  transform: rotateY(0deg);
  z-index: 2;
}

.box:not(.disabled):hover .box-front {
  box-shadow: 0 12px 32px rgba(108, 92, 231, 0.6);
  border-color: rgba(255, 255, 255, 0.4);
}

.box:not(.disabled):active .box-front {
  transform: scale(0.95);
}

.box-back {
  background: linear-gradient(145deg, #2d2d5e, #3d3d7e);
  border: 3px solid rgba(255, 255, 255, 0.15);
  transform: rotateY(180deg);
  z-index: 1;
}

.box.flipped .box-front {
  transform: rotateY(-180deg);
  z-index: 1;
}

.box.flipped .box-back {
  transform: rotateY(0deg);
  z-index: 2;
}

/* 炸弹盒子 */
.box.bomb .box-back {
  background: linear-gradient(145deg, #c0392b, #e74c3c);
  border-color: #ff6b6b;
  box-shadow: 0 0 30px rgba(231, 76, 60, 0.5);
}

/* 安全盒子 */
.box.safe .box-back {
  background: linear-gradient(145deg, #1a5c3a, #27ae60);
  border-color: #6bff9e;
  box-shadow: 0 0 30px rgba(39, 174, 96, 0.4);
}

/* 抖动动画 */
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  10%, 30%, 50%, 70%, 90% { transform: translateX(-6px); }
  20%, 40%, 60%, 80% { transform: translateX(6px); }
}

.box.shake {
  animation: shake 0.5s ease;
}

/* 弹跳动画 */
@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  40% { transform: translateY(-16px); }
  60% { transform: translateY(-8px); }
}

.box.bounce {
  animation: bounce 0.5s ease;
}

/* 历史记录 */
.history {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  max-width: 100%;
}

.history-dot {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 1.2em;
  animation: popIn 0.3s ease;
}

@keyframes popIn {
  from { transform: scale(0); }
  to { transform: scale(1); }
}

.history-dot.bomb {
  background: rgba(231, 76, 60, 0.25);
  border: 2px solid rgba(231, 76, 60, 0.5);
}

.history-dot.safe {
  background: rgba(39, 174, 96, 0.2);
  border: 2px solid rgba(39, 174, 96, 0.4);
}

/* 结算界面 */
#result-screen {
  text-align: center;
}

#result-icon {
  font-size: 5em;
  margin-bottom: 16px;
}

#result-title {
  font-size: 1.8em;
  margin-bottom: 16px;
}

#result-detail {
  color: rgba(255, 255, 255, 0.7);
  font-size: 1.05em;
  line-height: 1.8;
  margin-bottom: 28px;
}

#result-detail .round-line {
  padding: 4px 0;
}

#result-detail .round-line span {
  color: #ffd200;
  font-weight: 700;
}

/* 响应式 */
@media (max-width: 400px) {
  .box {
    width: 120px;
    height: 140px;
  }

  .box-front, .box-back {
    font-size: 3.5em;
  }

  .boxes {
    gap: 20px;
  }

  #start-screen h1 {
    font-size: 2.4em;
  }
}