* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: #f5f5f5;
  color: #222;
  font-family: "Noto Sans TC", "Microsoft JhengHei", sans-serif;
}

.product-page {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 0 80px;
}

/* 列表頁（我的商品／收藏／訊息／聊天） */
.product-page--list {
  padding: 64px 16px 80px;
}

.product-page--list .list-title {
  margin: 0 0 12px;
  color: #111;
  font-size: 22px;
  font-weight: 700;
}

.list-hint {
  margin: -4px 0 16px;
  color: #888;
  font-size: 13px;
  line-height: 1.5;
}

.product-page--list .product-status {
  margin: 0 0 16px;
  padding: 0;
  text-align: left;
}

/* App 風格返回鍵 */
.product-back-btn {
  position: fixed;
  top: 14px;
  left: 14px;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.22);
  color: #111;
  font-size: 22px;
  line-height: 1;
  text-decoration: none;
  -webkit-tap-highlight-color: transparent;
}

.product-back-btn:hover {
  background: #fff;
  color: #111;
}

.product-status {
  margin: 0;
  padding: 72px 24px 24px;
  color: #777;
  font-size: 15px;
  text-align: center;
}

.product-status.hidden {
  display: none;
}

.product-detail {
  overflow: hidden;
  background: #fff;
}

.product-detail-media {
  width: 100%;
  height: min(62vh, 560px);
  background: #f0f0f0;
}

.product-detail-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  background: #f0f0f0;
}

.product-detail-info {
  padding: 20px 20px 28px;
}

.product-detail-info h1 {
  margin: 0 0 12px;
  color: #111;
  font-size: 22px;
}

.product-detail-info .product-price {
  margin: 0 0 16px;
  color: #d32f2f;
  font-size: 22px;
  font-weight: 700;
}

.seller-link {
  color: #111;
  text-decoration: underline;
}

.seller-link:hover {
  color: #555;
}

.product-meta {
  margin: 0 0 8px;
  color: #555;
  font-size: 14px;
}

.product-desc {
  margin: 16px 0 0;
  color: #333;
  font-size: 15px;
  line-height: 1.6;
  overflow-wrap: anywhere;
  white-space: pre-wrap;
}

.contact-btn {
  display: inline-block;
  margin-top: 20px;
  padding: 12px 18px;
  border: none;
  border-radius: 4px;
  background: #111;
  color: #fff;
  font-size: 15px;
  cursor: pointer;
}

.contact-btn:hover {
  background: #333;
}

.contact-btn:disabled {
  opacity: 0.7;
  cursor: default;
}

.hidden {
  display: none;
}

@media (max-width: 720px) {
  .product-page {
    max-width: none;
  }

  .product-detail-media {
    height: min(58vh, 480px);
  }

  .product-detail-info {
    padding: 18px 16px 32px;
  }

  .product-detail-info h1 {
    font-size: 20px;
  }
}