/* 首屏 3D 好物雷达：雷达居中，商品与粒子环绕公转
   配色：青蓝 = 技术/数据，品牌橙点缀 */
.radar {
  --scan: #38bdf8;
  --scan-light: #bae6fd;
  position: absolute; inset: 0; overflow: hidden; perspective: 1100px;
}
.radar-particles { position: absolute; inset: 0; width: 100%; height: 100%; }

/* 雷达盘：正圆按透视比例压扁成椭圆，与环绕轨道一致 */
.radar-disk {
  position: absolute; left: 50%; top: 50%; border-radius: 50%;
  width: calc(var(--R) * 2); height: calc(var(--R) * 2);
  margin: calc(var(--R) * -1) 0 0 calc(var(--R) * -1);
  transform: scaleY(var(--k));
  background:
    radial-gradient(circle, transparent 0 24%, rgba(56,189,248,.5) 24.3% 24.7%, transparent 25% 49%,
      rgba(56,189,248,.35) 49.3% 49.7%, transparent 50% 74%, rgba(56,189,248,.25) 74.3% 74.7%, transparent 75% 99%,
      rgba(56,189,248,.6) 99.3% 100%),
    repeating-conic-gradient(from 0deg, rgba(186,230,253,.1) 0 .6deg, transparent .6deg 30deg),
    radial-gradient(circle, rgba(56,189,248,.18), transparent 70%);
}
.radar-disk::before {
  content: ""; position: absolute; inset: 0; border-radius: 50%;
  background: conic-gradient(from 0deg, rgba(56,189,248,.65), rgba(56,189,248,0) 75deg, transparent 360deg);
  animation: radar-spin 5s linear infinite;
}
.radar-disk::after {
  content: ""; position: absolute; left: 50%; top: 50%; width: 18px; height: 18px; margin: -9px;
  border-radius: 50%; background: var(--scan-light); box-shadow: 0 0 30px 10px rgba(56,189,248,.75);
}
@keyframes radar-spin { to { transform: rotate(360deg); } }

/* 环绕的商品卡片（位置由 JS 每帧计算） */
.radar-slot {
  position: absolute; left: 50%; top: 50%; width: 116px; height: 148px; margin: -74px 0 0 -58px;
  will-change: transform, opacity;
}
.radar-card {
  position: relative; width: 100%; height: 100%; border-radius: 16px; padding: 18px 12px 12px;
  display: flex; flex-direction: column; align-items: center; justify-content: space-between;
  background: linear-gradient(155deg, rgba(186,230,253,.16), rgba(56,189,248,.04) 60%, rgba(255,255,255,.03));
  border: 1px solid rgba(186,230,253,.22);
  box-shadow: 0 20px 40px rgba(0,0,0,.28), inset 0 1px 0 rgba(255,255,255,.22);
  animation: radar-float var(--dur, 6s) ease-in-out var(--delay, 0s) infinite;
}
@keyframes radar-float {
  0%, 100% { transform: translateY(0) rotateY(-8deg) rotateX(3deg); }
  50% { transform: translateY(-12px) rotateY(8deg) rotateX(-3deg); }
}
.radar-card svg { width: 52px; height: 52px; fill: none; stroke: #e0f2fe; stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; }
.radar-card .name { font-size: 13px; color: #cbd9e6; letter-spacing: 1px; }
.radar-card .bar { width: 70%; height: 4px; border-radius: 4px; background: rgba(255,255,255,.1); overflow: hidden; }
.radar-card .bar i { display: block; height: 100%; width: var(--score, 60%); background: linear-gradient(90deg, rgba(56,189,248,.5), var(--scan)); }

@media (prefers-reduced-motion: reduce) {
  .radar-disk::before, .radar-card { animation: none; }
}