/* ========== products page ========== */
.page-products {
  --color-red: #D32F2F;
  --color-silver: #B0BEC5;
  --color-yellow: #FBC02D;
  --color-blue: #2196F3;
  --bg-dark: #121212;
  --bg-card: #1E1E1E;
  --text-primary: #fff;
  --text-secondary: #B0BEC5;
  --heading-font: 'Bebas Neue','Impact',sans-serif;
  --body-font: 'Inter','Roboto',sans-serif;
  --score-font: 'Fira Mono',monospace;
  --border-thick: 8px;
  --shadow-strong: 0 8px 24px rgba(0,0,0,0.6);
  --container-max: 1280px;

  font-family: var(--body-font);
  color: var(--text-primary);
  background-color: var(--bg-dark);
  padding: 24px 16px 64px;
  max-width: var(--container-max);
  margin: 0 auto;
}

/* 面包屑 */
.page-products .breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 32px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}
.page-products .breadcrumb a {
  color: var(--color-blue);
  text-decoration: none;
}
.page-products .breadcrumb a:hover {
  text-decoration: underline;
}
.page-products .breadcrumb__sep {
  color: var(--text-secondary);
}

/* 主标题 */
.page-products__title {
  font-family: var(--heading-font);
  font-size: 3rem;
  line-height: 1;
  margin: 0 0 8px;
  color: var(--color-red);
  text-transform: uppercase;
}
.page-products__subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin: 0 0 48px;
  letter-spacing: 1px;
}

/* 每个章节 */
.page-products__section {
  margin-bottom: 64px;
}
.page-products__section-heading {
  font-family: var(--heading-font);
  font-size: 2.2rem;
  line-height: 1;
  margin: 0 0 16px;
  color: var(--color-yellow);
  display: flex;
  align-items: center;
  gap: 12px;
}
.page-products__section-desc {
  color: var(--text-secondary);
  margin: 0 0 32px;
  max-width: 600px;
}

/* 设备卡片网格 */
.page-products__devices {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

/* 设备卡片（3D 翻转） */
.device-card {
  perspective: 1000px;
  height: 320px;
}
.device-card__inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.6s;
  transform-style: preserve-3d;
}
.device-card:hover .device-card__inner {
  transform: rotateY(180deg);
}
.device-card__front,
.device-card__back {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--color-silver);
  border-radius: 8px;
  background: var(--bg-card);
  box-shadow: var(--shadow-strong);
  padding: 16px;
  overflow: hidden;
}
.device-card__front {
  z-index: 2;
}
.device-card__back {
  transform: rotateY(180deg);
  font-weight: 600;
  text-align: center;
  gap: 12px;
  color: var(--color-blue);
  background: #1a1a2e;
}
.device-card__img {
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 4px;
}
.device-card__label {
  margin-top: 12px;
  font-family: var(--heading-font);
  font-size: 1.4rem;
  color: var(--color-silver);
  text-transform: uppercase;
}

/* 内地注册 */
.page-products__registration {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 32px;
  padding: 32px;
  border: 2px solid var(--color-silver);
  border-radius: 8px;
  background: var(--bg-card);
}
.page-products__reg-icon {
  flex: 0 0 auto;
}
.page-products__reg-img {
  display: block;
  width: 100px;
  height: 100px;
  object-fit: cover;
  border-radius: 50%;
  border: 3px solid var(--color-yellow);
}
.page-products__reg-info {
  flex: 1;
  min-width: 200px;
}
.page-products__reg-info p {
  margin: 0 0 16px;
  font-size: 1rem;
  color: var(--text-primary);
}
.page-products__btn-download {
  display: inline-block;
  padding: 12px 32px;
  background: var(--color-red);
  color: var(--text-primary);
  font-family: var(--heading-font);
  font-size: 1.2rem;
  text-decoration: none;
  border: 2px solid var(--color-red);
  border-radius: 4px;
  transition: transform 0.2s, box-shadow 0.2s;
  animation: pulse-download 2s infinite;
}
@keyframes pulse-download {
  0% { box-shadow: 0 0 0 0 rgba(211,47,47,0.7); }
  70% { box-shadow: 0 0 0 12px rgba(211,47,47,0); }
  100% { box-shadow: 0 0 0 0 rgba(211,47,47,0); }
}
.page-products__btn-download:hover {
  transform: scale(1.05);
}

/* QR 码弹出 (:target) */
#download-popup {
  display: none;
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  padding: 24px;
  background: var(--bg-card);
  border: 2px solid var(--color-silver);
  border-radius: 8px;
  box-shadow: var(--shadow-strong);
  z-index: 100;
  text-align: center;
}
#download-popup:target {
  display: block;
}
.page-products__qr-img {
  max-width: 200px;
  height: auto;
  display: block;
  margin: 0 auto 16px;
}
.page-products__qr-close {
  display: inline-block;
  padding: 8px 16px;
  background: var(--color-silver);
  color: var(--bg-dark);
  text-decoration: none;
  border-radius: 4px;
  font-size: 0.9rem;
}

/* 同步说明 */
.page-products__sync {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 24px;
  border-left: 4px solid var(--color-blue);
  background: var(--bg-card);
}
.page-products__sync-icon {
  flex: 0 0 auto;
}
.page-products__sync-img {
  width: 80px;
  height: 80px;
  object-fit: cover;
  animation: spin-sync 3s linear infinite;
}
@keyframes spin-sync {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}
.page-products__sync p {
  margin: 0;
  font-size: 1.1rem;
  color: var(--text-primary);
}
.page-products__help {
  margin-top: 24px;
  color: var(--text-secondary);
}
.page-products__help a {
  color: var(--color-yellow);
  text-decoration: underline;
}

/* ========== 桌面 ≥768px ========== */
@media (min-width: 768px) {
  .page-products {
    padding: 40px 24px 80px;
  }
  .page-products__title {
    font-size: 4rem;
  }
  .page-products__devices {
    grid-template-columns: repeat(3, 1fr);
  }
  .device-card {
    height: 400px;
  }
  .device-card__img {
    max-height: 70%;
    object-fit: contain;
  }
  .page-products__registration {
    flex-wrap: nowrap;
  }
  .page-products__sync {
    max-width: 600px;
  }
}