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

body {
  width: 100vw;
  height: 100vh;
  background: #ffffff;
  overflow: hidden;
  font-family: "ZCOOL KuaiLe", "PingFang SC", "Microsoft YaHei", sans-serif;
  user-select: none;
  cursor: none;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* 动态背景 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background: transparent;
  z-index: 0;
  pointer-events: none;
}

@keyframes bgDrift {
  0% { opacity: 0.6; transform: scale(1) rotate(0deg); }
  100% { opacity: 1; transform: scale(1.1) rotate(3deg); }
}

/* 标题 */
.header {
  position: absolute;
  top: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  text-align: center;
  pointer-events: none;
}

.title {
  font-size: 38px;
  color: rgba(20, 20, 40, 0.9);
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.08), 0 0 30px rgba(140, 180, 255, 0.2);
  letter-spacing: 8px;
  animation: titleFloat 4s ease-in-out infinite;
}

@keyframes titleFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.subtitle {
  font-size: 13px;
  color: rgba(80, 80, 100, 0.55);
  margin-top: 14px;
  letter-spacing: 5px;
}

/* 状态提示 */
.status-banner {
  position: absolute;
  top: 130px;
  left: 50%;
  transform: translateX(-50%);
  padding: 10px 28px;
  background: rgba(0, 0, 0, 0.04);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(180, 180, 220, 0.18);
  border-radius: 30px;
  color: rgba(60, 60, 80, 0.75);
  font-size: 14px;
  letter-spacing: 2px;
  z-index: 10;
  pointer-events: none;
  animation: statusGlow 3s ease-in-out infinite;
}

@keyframes statusGlow {
  0%, 100% { box-shadow: 0 0 15px rgba(120, 160, 255, 0.06); }
  50% { box-shadow: 0 0 30px rgba(120, 160, 255, 0.15); }
}

/* 三个长方形容器 */
.cards-row {
  display: flex;
  gap: 40px;
  z-index: 5;
  position: relative;
}

.card {
  width: 320px;
  height: 420px;
  background: rgba(0, 0, 0, 0.03);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1.5px solid rgba(180, 180, 220, 0.18);
  border-radius: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  animation: cardFloat 4s ease-in-out infinite;
  cursor: pointer;
  touch-action: manipulation;
}

.card:nth-child(1) { animation-delay: 0s; }
.card:nth-child(2) { animation-delay: 0.5s; }
.card:nth-child(3) { animation-delay: 1s; }

@keyframes cardFloat {
  0%, 100% { transform: translateY(0); }
  30% { transform: translateY(-10px); }
  60% { transform: translateY(6px); }
}

/* 卡片光晕边框 */
.card::before {
  content: "";
  position: absolute;
  inset: -2px;
  border-radius: 22px;
  padding: 2px;
  background: linear-gradient(135deg, rgba(180, 180, 220, 0.2), transparent 60%);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.4s;
}

.card.highlight {
  transform: scale(1.1) translateY(-14px) !important;
  border-color: rgba(140, 180, 255, 0.5) !important;
  background: rgba(255, 255, 255, 0.14) !important;
  box-shadow:
    0 12px 40px rgba(0, 0, 0, 0.2),
    0 0 50px rgba(140, 180, 255, 0.3) !important;
  animation: cardBuzz 0.5s ease-in-out infinite !important;
}

.card.highlight::before {
  opacity: 1;
}

@keyframes cardBuzz {
  0%, 100% { transform: scale(1.1) translateY(-14px) rotate(0deg); }
  50% { transform: scale(1.12) translateY(-16px) rotate(1.5deg); }
}

/* 卡片内部图片 */
.card-image {
  width: 85%;
  height: auto;
  max-height: 65%;
  object-fit: contain;
  pointer-events: none;
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.3));
}

.card.highlight .card-image {
  transform: scale(1.1) rotate(5deg);
}

/* 卡片标签 */
.card-label {
  position: absolute;
  bottom: 24px;
  font-size: 18px;
  color: rgba(80, 80, 100, 0.6);
  letter-spacing: 2px;
  pointer-events: none;
  transition: color 0.4s;
}

.card:nth-child(1) .card-label { color: rgba(140, 200, 255, 0.7); }
.card:nth-child(2) .card-label { color: rgba(200, 160, 255, 0.7); }
.card:nth-child(3) .card-label { color: rgba(255, 200, 140, 0.7); }

.card.highlight .card-label {
  color: rgba(20, 20, 40, 0.9) !important;
}

/* 卡片编号角标 */
.card-number {
  position: absolute;
  top: 18px;
  left: 22px;
  font-size: 15px;
  color: rgba(100, 100, 120, 0.35);
  letter-spacing: 1px;
  pointer-events: none;
}

/* 占位图标（第二、三个卡片） */
.placeholder-icon {
  font-size: 60px;
  opacity: 0.3;
  pointer-events: none;
  transition: opacity 0.4s;
}

.card.highlight .placeholder-icon {
  opacity: 0.55;
}

/* 手势光标 */
#handCursor {
  position: fixed;
  width: 26px;
  height: 26px;
  background: radial-gradient(circle at 40% 40%, rgba(140, 180, 255, 0.85), rgba(120, 140, 255, 0.55));
  border: 2px solid rgba(255, 255, 255, 0.8);
  border-radius: 50%;
  pointer-events: none;
  z-index: 9999;
  transform: translate(-50%, -50%);
  box-shadow: 0 0 18px rgba(140, 180, 255, 0.4), 0 0 36px rgba(120, 140, 255, 0.2);
  transition: width 0.2s, height 0.2s, background 0.2s, box-shadow 0.2s;
}

#handCursor.grabbing {
  width: 14px;
  height: 14px;
  background: radial-gradient(circle at 40% 40%, #6b9dff, #3b6dff);
  border-color: rgba(255, 255, 255, 0.95);
  box-shadow: 0 0 28px rgba(59, 109, 255, 0.6), 0 0 56px rgba(107, 157, 255, 0.35);
}

/* 摄像头 */
.webcam-container {
  display: none;
}

/* Toast */
.toast-container {
  position: fixed;
  top: 24px;
  right: 24px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 10px;
  pointer-events: none;
}

.toast {
  padding: 12px 24px;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(180, 180, 220, 0.2);
  border-radius: 14px;
  color: #3d3d50;
  font-size: 14px;
  letter-spacing: 1px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  animation:
    toastIn 0.4s cubic-bezier(0.34, 1.56, 0.64, 1) forwards,
    toastOut 0.35s ease-in 2.2s forwards;
}

@keyframes toastIn {
  0% { opacity: 0; transform: translateX(60px) scale(0.8); }
  100% { opacity: 1; transform: translateX(0) scale(1); }
}

@keyframes toastOut {
  0% { opacity: 1; transform: translateX(0) scale(1); }
  100% { opacity: 0; transform: translateY(-20px) scale(0.9); }
}

/* 粒子画布 */
#particleCanvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

/* ==================== 移动端适配 ==================== */
@media only screen and (max-width: 768px) {
  body {
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
    flex-direction: column;
    justify-content: flex-start;
    cursor: auto;
    height: auto;
    min-height: 100vh;
  }

  .header {
    position: relative;
    top: auto;
    left: auto;
    transform: none;
    margin-top: 24px;
    padding: 0 16px;
  }

  .title {
    font-size: 24px;
    letter-spacing: 4px;
  }

  .subtitle {
    font-size: 11px;
    letter-spacing: 3px;
    margin-top: 8px;
  }

  .status-banner {
    position: relative;
    top: auto;
    left: auto;
    transform: none;
    margin: 16px auto 0;
    padding: 8px 18px;
    font-size: 12px;
    letter-spacing: 1px;
    white-space: normal;
    text-align: center;
    max-width: 90vw;
  }

  .cards-row {
    flex-direction: column;
    gap: 20px;
    margin-top: 28px;
    padding-bottom: 40px;
  }

  .card {
    width: 85vw;
    max-width: 320px;
    height: 340px;
    border-radius: 16px;
  }

  .card::before {
    border-radius: 18px;
  }

  .card-image {
    max-height: 55%;
  }

  .card-label {
    font-size: 16px;
    bottom: 20px;
  }

  .card-number {
    font-size: 13px;
    top: 14px;
    left: 18px;
  }

  #handCursor {
    display: none !important;
  }

  .toast-container {
    top: 12px;
    right: 12px;
  }

  .toast {
    padding: 10px 18px;
    font-size: 12px;
  }

  .webcam-container {
    display: none !important;
  }
}