/* ========================================
   STM32 辅助开发集成平台 - 内容区域样式
   ======================================== */

/* --- 面包屑 --- */
.breadcrumb {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
}

.breadcrumb a {
  color: var(--text-secondary);
  text-decoration: none;
}
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb .sep { margin: 0 6px; color: #ccc; }
.breadcrumb .current { color: var(--text-primary); font-weight: 500; }

/* --- 文章排版 --- */
article h1 {
  font-size: 28px;
  font-weight: 700;
  margin-top: 0;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--primary-light);
  color: var(--text-primary);
}

article h2 {
  font-size: 22px;
  font-weight: 600;
  margin-top: 36px;
  margin-bottom: 14px;
  padding-left: 0;
  color: var(--text-primary);
}

article h3 {
  font-size: 18px;
  font-weight: 600;
  margin-top: 28px;
  margin-bottom: 10px;
  color: var(--text-primary);
}

article h4 {
  font-size: 16px;
  font-weight: 600;
  margin-top: 20px;
  margin-bottom: 8px;
  color: var(--text-primary);
}

article p {
  margin-bottom: 12px;
  line-height: 1.8;
}

article ul, article ol {
  margin-bottom: 12px;
  line-height: 1.8;
}

article li {
  margin-bottom: 4px;
}

article strong {
  font-weight: 600;
  color: var(--text-primary);
}

/* --- 表格 --- */
article table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 14px;
}

article th, article td {
  padding: 10px 14px;
  border: 1px solid var(--border-color);
  text-align: left;
}

article th {
  background: var(--sidebar-bg);
  font-weight: 600;
  color: var(--text-primary);
}

article tr:nth-child(even) { background: #FAFAFA; }
article tr:hover { background: var(--primary-light); }

/* --- 信息提示框 --- */
.callout {
  padding: 14px 18px;
  margin: 16px 0;
  border-radius: var(--radius);
  border-left: 4px solid;
  font-size: 14px;
  line-height: 1.7;
}

.callout--info {
  background: #E3F2FD;
  border-color: #2196F3;
  color: #1565C0;
}

.callout--success {
  background: #E8F5E9;
  border-color: var(--success);
  color: #2E7D32;
}

.callout--warning {
  background: #FFF8E1;
  border-color: var(--warning);
  color: #F57F17;
}

.callout--danger {
  background: #FFEBEE;
  border-color: #F44336;
  color: #C62828;
}

.callout--tip {
  background: var(--primary-light);
  border-color: var(--primary);
  color: #00695C;
}

.callout strong { display: block; margin-bottom: 4px; font-size: 15px; }

/* --- 代码块 --- */
.code-block {
  position: relative;
  margin: 16px 0;
  border: 1px solid var(--code-border);
  border-radius: var(--radius);
  background: var(--code-bg);
  overflow: hidden;
}

.code-block__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 14px;
  background: #ECEFF1;
  border-bottom: 1px solid var(--code-border);
  font-size: 12px;
  color: var(--text-secondary);
}

.code-block__copy-btn {
  background: none;
  border: 1px solid var(--border-color);
  border-radius: 3px;
  padding: 2px 10px;
  font-size: 12px;
  font-family: var(--font-sans);
  color: var(--text-secondary);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.code-block__copy-btn:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.code-block__copy-btn.copied {
  background: var(--success);
  color: #fff;
  border-color: var(--success);
}

.code-block pre {
  margin: 0;
  padding: 14px 18px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.6;
  tab-size: 4;
}

.code-block code {
  font-family: inherit;
  font-size: inherit;
  background: none;
  padding: 0;
  color: inherit;
}

/* 行内代码 */
:not(pre) > code {
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: 3px;
  padding: 2px 6px;
  font-family: var(--font-mono);
  font-size: 13.5px;
  color: #D63384;
  word-break: break-word;
}

/* --- 测验题 --- */
.quiz-item {
  margin: 16px 0;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 12px 18px;
  background: #FAFAFA;
}

.quiz-item summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 15px;
  color: var(--text-primary);
  padding: 4px 0;
  outline: none;
}

.quiz-item summary:hover { color: var(--primary); }

.quiz-answer {
  margin-top: 12px;
  padding: 12px 16px;
  background: #E8F5E9;
  border: 1px solid #C8E6C9;
  border-radius: var(--radius);
  color: #2E7D32;
  font-size: 14px;
  line-height: 1.6;
}

.quiz-answer code {
  background: #C8E6C9;
  border-color: #A5D6A7;
  color: #1B5E20;
}

/* --- 上一节 / 下一节 --- */
.page-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--border-color);
}

.page-nav__prev, .page-nav__next {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 18px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  font-size: 14px;
  color: var(--text-primary);
  text-decoration: none !important;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}

.page-nav__prev:hover, .page-nav__next:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-light);
}

.page-nav__prev--disabled, .page-nav__next--disabled {
  opacity: 0.35;
  pointer-events: none;
}

/* --- 资源卡片网格 --- */
.resource-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  margin: 16px 0;
}

.resource-card {
  display: block;
  padding: 18px 20px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background: #fff;
  text-decoration: none !important;
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s, transform 0.2s, border-color 0.2s;
}

.resource-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  border-color: var(--primary);
}

.resource-card__title {
  font-size: 16px;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 6px;
}

.resource-card__desc {
  font-size: 13.5px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 8px;
}

.resource-card__meta {
  font-size: 12px;
  color: var(--text-muted);
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.resource-card__tag {
  display: inline-block;
  padding: 1px 8px;
  background: var(--primary-light);
  color: var(--primary-dark);
  border-radius: 10px;
  font-size: 11.5px;
}

/* --- 分类标题（资源页） --- */
.section-title {
  font-size: 20px;
  font-weight: 600;
  margin-top: 32px;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-primary);
}

/* --- 首页英雄区 --- */
.hero {
  text-align: center;
  padding: 48px 20px 36px;
}

.hero h1 {
  font-size: 32px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 12px;
  border-bottom: none;
  padding-bottom: 0;
}

.hero p {
  font-size: 17px;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* --- 首页卡片入口 --- */
.home-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin: 28px 0;
}

.home-card {
  display: block;
  padding: 32px 28px;
  border: 2px solid var(--border-color);
  border-radius: 8px;
  background: #fff;
  text-decoration: none !important;
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.25s, transform 0.25s, border-color 0.25s;
}

.home-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
  border-color: var(--primary);
}

.home-card__icon {
  font-size: 36px;
  margin-bottom: 12px;
}

.home-card__title {
  font-size: 22px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 8px;
}

.home-card__desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* --- 快速链接 --- */
.quick-links {
  margin: 20px 0 32px;
}

.quick-links h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text-secondary);
}

.quick-links__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  padding: 0;
}

.quick-links__list li { margin: 0; }

.quick-links__list a {
  display: inline-block;
  padding: 6px 14px;
  background: var(--primary-light);
  border-radius: 16px;
  font-size: 13px;
  color: var(--primary-dark) !important;
  text-decoration: none !important;
  transition: background 0.2s;
}

.quick-links__list a:hover { background: #B2DFDB; }

/* --- 学习目标框 --- */
.learning-objectives {
  background: #FFF8E1;
  border: 1px solid #FFE082;
  border-radius: var(--radius);
  padding: 16px 20px;
  margin: 16px 0 24px;
}

.learning-objectives strong {
  display: block;
  margin-bottom: 8px;
  color: #F57F17;
  font-size: 15px;
}

.learning-objectives ul {
  margin: 0;
  padding-left: 20px;
}

.learning-objectives li {
  font-size: 14px;
  margin-bottom: 4px;
  color: var(--text-primary);
}

/* --- 小结框 --- */
.summary-box {
  background: var(--primary-light);
  border: 1px solid #B2DFDB;
  border-radius: var(--radius);
  padding: 16px 20px;
  margin: 20px 0;
}

.summary-box strong {
  display: block;
  margin-bottom: 8px;
  color: var(--primary-dark);
  font-size: 15px;
}

.summary-box ul {
  margin: 0;
  padding-left: 20px;
}

.summary-box li {
  font-size: 14px;
  margin-bottom: 4px;
}

/* --- 底部关于区 --- */
.about-section {
  text-align: center;
  padding: 24px 20px 8px;
  color: var(--text-muted);
  font-size: 13px;
  line-height: 1.7;
}

/* --- 响应式 --- */
@media (max-width: 768px) {
  .home-grid { grid-template-columns: 1fr; gap: 16px; }
  .home-card { padding: 24px 20px; }
  .hero h1 { font-size: 26px; }
  .hero { padding: 32px 16px 24px; }
  .resource-grid { grid-template-columns: 1fr; }
  .page-nav { flex-direction: column; gap: 10px; align-items: stretch; }
  article h1 { font-size: 24px; }
  article h2 { font-size: 19px; }
}