/* ── 製品紹介 PDF 查看页（product_intro.html） ── */
body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg, #f4f6f9);
}

.product-intro-header {
  flex-shrink: 0;
  background: var(--primary, #1e3a5f);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.18);
}

.product-intro-header-inner {
  max-width: 1200px;
  margin: 0 auto;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  gap: 16px;
}

.product-intro-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: #fff;
}

.product-intro-logo-icon {
  width: 32px;
  height: 32px;
  background: var(--accent, #e8a838);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 900;
  color: #fff;
  flex-shrink: 0;
}

.product-intro-title {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.2px;
}

.product-intro-back {
  color: rgba(255, 255, 255, 0.85);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  padding: 6px 14px;
  border-radius: 7px;
  transition: background 0.18s, color 0.18s;
}

.product-intro-back:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.12);
}

.product-intro-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.product-intro-frame {
  flex: 1;
  width: 100%;
  min-height: calc(100vh - 56px);
  border: none;
  background: #525659;
}

.product-intro-missing {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 48px 24px;
  font-size: 16px;
  color: var(--text-muted, #64748b);
  text-align: center;
}