/* ---- Documents Two-Column Layout ---- */

.doc-row {
  display: flex;
  gap: 2.5rem;
  padding: 2rem 2.2rem;
  margin-top: 2rem;
  align-items: stretch;
}

/* 左侧：预览 + 下载 */

.doc-left {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.doc-left h2 {
  margin-bottom: 0.9rem;
}

/* PDF 预览框 */
.doc-preview {
  border: 1px solid #e5e7eb;
  border-radius: 0.6rem;
  height: 340px;
  overflow: hidden;
  margin-bottom: 0.8rem;
  background: #111827;
}

.doc-preview iframe {
  width: 100%;
  height: 100%;
  border: none;
}

/* 打开 / 下载操作 */

.doc-actions {
  margin-top: 0.3rem;
}

.doc-actions a {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.92rem;
  font-weight: 500;
  text-decoration: none;
  color: #2563eb;
}

.doc-actions a::after {
  content: "→";
  font-size: 0.9rem;
}

.doc-actions a:hover {
  text-decoration: underline;
}

/* 右侧：介绍内容 */

.doc-right {
  flex: 1.1;
  display: flex;
  flex-direction: column;
}

/* 标题行 + 徽标 */

.doc-right-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-bottom: 0.6rem;
}

.doc-right-header h3 {
  margin: 0;
  font-size: 1.05rem;
}

.doc-badge {
  padding: 0.18rem 0.7rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  background: #eef2ff;
  color: #4338ca;
  white-space: nowrap;
}

/* 概要段落 */

.doc-right-intro {
  margin: 0 0 1rem;
  color: #4b5563;
  line-height: 1.7;
}

/* 小标题 */

.doc-subheading {
  margin: 0 0 0.45rem;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #6b7280;
}

/* 高亮点列表 */

.doc-highlights {
  margin: 0;
  padding-left: 1.2rem;
  color: #4b5563;
  font-size: 0.95rem;
  line-height: 1.6;
}

.doc-highlights li + li {
  margin-top: 0.25rem;
}

/* ---- Responsive ---- */

@media (max-width: 900px) {
  .doc-row {
    flex-direction: column;
  }

  .doc-right-header {
    flex-direction: column;
    align-items: flex-start;
  }
}