/* hero 区暗色粒子背景（与 env-check 同源，粒子为蓝色） */
.hero-card {
  position: relative;
  z-index: 1;
  overflow: hidden;
  isolation: isolate;
  border: none;
  border-bottom: 1px solid #08090c;
  background: #0a0b0f;
}

.hero-card__content {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  gap: 0;
  padding:
    calc(1.15rem + env(safe-area-inset-top, 0px))
    1.15rem
    1rem;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
  contain: layout paint;
}

.hero-bg__depth {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 55% 45% at 50% 38%, rgba(64, 150, 255, 0.08), transparent 62%),
    radial-gradient(ellipse 90% 75% at 50% 32%, rgba(22, 119, 255, 0.04), transparent 70%),
    linear-gradient(180deg, #0a0b0f 0%, #08090c 100%);
}

.hero-bg__layer {
  position: absolute;
  inset: 0;
  overflow: hidden;
  filter: blur(var(--layer-shape-blur, 0px));
}

.hero-bg__layer--far {
  --layer-shape-blur: 2.5px;
  z-index: 1;
  animation: hero-layer-drift-far 11s ease-in-out infinite;
}

.hero-bg__layer--mid {
  --layer-shape-blur: 1px;
  z-index: 2;
  animation: hero-layer-drift-mid 8s ease-in-out infinite;
}

.hero-bg__layer--near {
  --layer-shape-blur: 0px;
  z-index: 3;
  animation: hero-layer-drift-near 5.5s ease-in-out infinite;
}

@keyframes hero-layer-drift-far {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(1.5%, -1%) scale(1.02); }
}

@keyframes hero-layer-drift-mid {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-1.2%, 1.4%) scale(1.015); }
}

@keyframes hero-layer-drift-near {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(0.8%, -1.6%) scale(1.01); }
}

.hero-bg .float-shape {
  position: absolute;
  left: var(--x);
  top: var(--y);
  background: var(--fill);
  transform: translate(-50%, -50%);
  animation: hero-float-orbit var(--dur, 60s) ease-in-out infinite;
  animation-delay: var(--delay, 0s);
}

.hero-bg .float-shape--circle {
  width: var(--size);
  height: var(--size);
  border-radius: 50%;
}

@keyframes hero-float-orbit {
  0%, 100% {
    transform: translate(-50%, -50%) scale(1);
    opacity: 1;
  }
  50% {
    transform: translate(calc(-50% + var(--ox, 0px)), calc(-50% + var(--oy, 0px))) scale(1.08);
    opacity: 0.72;
  }
}

.hero-bg.is-static .hero-bg__layer,
.hero-bg.is-static .float-shape {
  animation: none;
}

/* 离屏 / 后台：暂停动画，不改成静态点 */
.hero-bg.is-paused .hero-bg__layer,
.hero-bg.is-paused .float-shape {
  animation-play-state: paused;
}

/* 手机：关掉昂贵模糊，保留粒子缓动；仅滚动时再暂停 */
@media (max-width: 768px), (pointer: coarse) {
  .hero-bg__layer {
    filter: none !important;
  }

  .hero-bg.is-lite .hero-bg__layer--far {
    animation-duration: 12s;
    opacity: 0.78;
  }

  .hero-bg.is-lite .hero-bg__layer--mid {
    animation-duration: 9s;
    opacity: 0.88;
  }

  .hero-bg.is-lite .hero-bg__layer--near {
    animation-duration: 6s;
  }
}

/* 滚动中：暂停粒子/图层；金光暂停见 main.css（需压过其 !important） */
html.is-scrolling .hero-bg__layer,
html.is-scrolling .hero-bg .float-shape {
  animation-play-state: paused !important;
}

@supports not ((filter: blur(1px))) {
  .hero-bg__layer--far { opacity: 0.55; }
  .hero-bg__layer--mid { opacity: 0.72; }
  .hero-bg__layer--near { opacity: 0.88; }
}

@media (prefers-reduced-motion: reduce) {
  .hero-bg__layer,
  .hero-bg .float-shape {
    animation: none !important;
  }
}