/* ---------- 基础重置 ---------- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  color: #333;
  max-width: 800px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ---------- 头部 ---------- */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 0;
  border-bottom: 1px solid #eee;
}

header h1 {
  font-size: 1.4rem;
}

nav a {
  margin-left: 16px;
  text-decoration: none;
  color: #555;
}

nav a.active {
  color: #000;
  font-weight: bold;
}

/* ---------- 主体 ---------- */
main {
  min-height: 60vh;
  padding: 30px 0;
}

/* ---------- 文章卡片 ---------- */
.post-card {
  padding: 20px 0;
  border-bottom: 1px solid #f0f0f0;
}

.post-card h2 {
  font-size: 1.2rem;
  margin-bottom: 6px;
  cursor: pointer;
}

.post-card h2:hover {
  color: #0066cc;
}

.post-card .date {
  font-size: 0.85rem;
  color: #999;
}

.post-card .summary {
  margin-top: 8px;
  color: #666;
}

/* ---------- 文章详情 ---------- */
.post-detail .back {
  display: inline-block;
  margin-bottom: 16px;
  color: #0066cc;
  cursor: pointer;
  text-decoration: none;
}

.post-detail h2 {
  font-size: 1.5rem;
  margin-bottom: 8px;
}

.post-detail .date {
  font-size: 0.85rem;
  color: #999;
  margin-bottom: 20px;
}

.post-detail .content {
  line-height: 1.8;
}

/* ---------- 关于页 ---------- */
.about h2 {
  margin-bottom: 12px;
}

/* ---------- 评论区 ---------- */
#comments {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid #eee;
}

/* ---------- 底部 ---------- */
footer {
  padding: 20px 0;
  border-top: 1px solid #eee;
  text-align: center;
  font-size: 0.85rem;
  color: #999;
}