* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: linear-gradient(135deg, #1a1c2c 0%, #0a0e17 100%);
  color: #e8f0ff;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 10px;
}
#app {
  width: 100%;
  max-width: 420px;
  background: rgba(20, 25, 45, 0.9);
  border-radius: 24px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
  overflow: hidden;
  border: 1px solid rgba(111,139,255,0.2);
}
.screen {
  display: none;
  padding: 28px 20px;
  text-align: center;
}
.screen.active { display: block; }

/* 开始界面 */
.title {
  font-size: 2.2rem;
  font-weight: 800;
  background: linear-gradient(120deg, #4be3ff, #6f8bff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 10px;
}
.subtitle {
  display: block;
  font-size: 1.2rem;
  color: #ffd54a;
  margin-top: 4px;
}
.intro {
  color: #9db0d9;
  margin: 20px 0;
  line-height: 1.6;
}
.rules {
  background: rgba(255,255,255,0.06);
  border-radius: 12px;
  padding: 16px;
  margin: 20px 0;
  text-align: left;
}
.rules p {
  font-weight: 700;
  margin-bottom: 8px;
  color: #dbe5ff;
}
.rules ul {
  list-style: none;
}
.rules li {
  padding: 6px 0;
  color: #9db0d9;
  border-bottom: 1px dashed rgba(255,255,255,0.1);
}
.rules li:last-child { border: none; }

/* 按钮 */
.btn {
  width: 100%;
  padding: 16px 24px;
  border: none;
  border-radius: 14px;
  font-size: 1.1rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
  margin-top: 12px;
}
.btn.primary {
  background: linear-gradient(120deg, #4be3ff, #6f8bff);
  color: #00141d;
  box-shadow: 0 8px 24px rgba(75,227,255,0.3);
}
.btn.primary:active {
  transform: scale(0.96);
}
.btn.secondary {
  background: rgba(255,255,255,0.1);
  color: #dbe5ff;
  border: 1px solid rgba(255,255,255,0.2);
}
.btn:disabled {
  opacity: 0.5;
  pointer-events: none;
}

/* 游戏界面 */
.hud {
  display: flex;
  justify-content: space-around;
  margin-bottom: 20px;
  background: rgba(0,0,0,0.3);
  padding: 12px;
  border-radius: 12px;
}
.hud-item {
  font-size: 0.95rem;
  color: #9db0d9;
}
.hud-item span {
  color: #ffd54a;
  font-weight: 800;
  font-size: 1.1rem;
}
.question {
  margin: 20px 0;
}
#question-text {
  font-size: 1.3rem;
  color: #dbe5ff;
}
.highlight {
  color: #ff5fa2;
  font-weight: 800;
}

.images-container {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin: 24px 0;
}
.image-btn {
  background: none;
  border: 2px solid rgba(111,139,255,0.4);
  border-radius: 16px;
  padding: 8px;
  cursor: pointer;
  transition: all 0.2s;
  position: relative;
}
.image-btn:hover, .image-btn:active {
  border-color: #4be3ff;
  transform: scale(1.02);
}
.image-btn canvas {
  display: block;
  border-radius: 12px;
  background: #0a0e17;
}
.image-btn .label {
  position: absolute;
  top: 8px;
  left: 12px;
  background: rgba(0,0,0,0.6);
  color: #dbe5ff;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.9rem;
}

/* 倒计时条 */
.timer-bar {
  height: 8px;
  background: rgba(255,255,255,0.1);
  border-radius: 4px;
  margin: 20px 0 12px;
  overflow: hidden;
}
.timer-progress {
  height: 100%;
  background: linear-gradient(90deg, #4be3ff, #6f8bff);
  width: 100%;
  transition: width 0.1s linear;
}

/* 反馈 */
.feedback {
  min-height: 40px;
  font-size: 1.1rem;
  font-weight: 700;
  margin-top: 12px;
}
.feedback.correct { color: #4be3ff; }
.feedback.wrong { color: #ff5fa2; }

/* 结算界面 */
#result-screen h2 {
  font-size: 1.8rem;
  margin-bottom: 16px;
  color: #dbe5ff;
}
.result-score {
  background: linear-gradient(120deg, #4be3ff, #6f8bff);
  color: #00141d;
  padding: 20px;
  border-radius: 16px;
  margin: 20px 0;
}
.result-score .label {
  display: block;
  font-size: 0.9rem;
  opacity: 0.8;
}
.result-score .value {
  font-size: 2.5rem;
  font-weight: 800;
}
.result-stats {
  margin: 20px 0;
  color: #9db0d9;
  line-height: 1.8;
}
.title-badge {
  display: inline-block;
  background: #ffd54a;
  color: #241400;
  padding: 4px 12px;
  border-radius: 999px;
  font-weight: 800;
  font-size: 0.95rem;
}
.share-card {
  background: rgba(255,255,255,0.06);
  border-radius: 12px;
  padding: 16px;
  margin: 20px 0;
}
.share-card p {
  font-weight: 700;
  margin-bottom: 10px;
}
.share-text {
  background: rgba(0,0,0,0.3);
  padding: 12px;
  border-radius: 8px;
  margin: 10px 0;
  font-size: 0.9rem;
  color: #dbe5ff;
  line-height: 1.5;
  min-height: 60px;
}

/* 移动端适配 */
@media (max-width: 480px) {
  .title { font-size: 1.8rem; }
  .image-btn canvas { width: 140px; height: 140px; }
  .hud { font-size: 0.85rem; }
}