:root {
  --bg: #ffffff;
  --fg: #1f2430;
  --muted: #6b7280;
  --accent: #2563eb;
  --border: #e8eaee;
  --code-bg: #f6f8fa;
  --soft: #f7f9fc;
  --maxw: 860px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 20px;
}

/* 顶部导航 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid var(--border);
  backdrop-filter: saturate(180%) blur(8px);
}

.site-header .inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 62px;
}

.site-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--fg);
}

.site-title:hover {
  text-decoration: none;
}

.site-title i {
  display: inline-block;
  width: 9px;
  height: 9px;
  margin-right: 8px;
  border-radius: 50%;
  background: var(--accent);
  vertical-align: middle;
}

.site-nav a {
  margin-left: 20px;
  font-size: 14px;
  color: var(--muted);
}

.site-nav a.active,
.site-nav a:hover {
  color: var(--accent);
  text-decoration: none;
}

/* 首页头部 */
.hero {
  padding: 52px 0 36px;
  border-bottom: 1px solid var(--border);
}

.hero h1 {
  margin: 0 0 12px;
  font-size: 30px;
  line-height: 1.4;
}

.hero p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

.hero .tags {
  margin-top: 18px;
}

.tags span {
  display: inline-block;
  margin: 0 8px 8px 0;
  padding: 3px 11px;
  font-size: 13px;
  color: var(--muted);
  background: var(--soft);
  border: 1px solid var(--border);
  border-radius: 20px;
}

/* 文章列表 */
.section-title {
  margin: 42px 0 6px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--muted);
  text-transform: uppercase;
}

.post-list {
  padding-bottom: 20px;
}

.post-item {
  padding: 26px 0;
  border-bottom: 1px solid var(--border);
}

.post-item h2 {
  margin: 0 0 8px;
  font-size: 20px;
  line-height: 1.5;
}

.post-item h2 a {
  color: var(--fg);
}

.post-item h2 a:hover {
  color: var(--accent);
  text-decoration: none;
}

.post-meta {
  margin: 0 0 10px;
  font-size: 13px;
  color: var(--muted);
}

.post-meta span::before {
  content: "·";
  margin: 0 8px;
}

.post-excerpt {
  margin: 0 0 10px;
  color: #4b5563;
  font-size: 15px;
}

.read-more {
  font-size: 14px;
}

/* 文章正文 */
.post {
  padding: 44px 0 20px;
}

.post-header {
  padding-bottom: 22px;
  border-bottom: 1px solid var(--border);
}

.post-header h1 {
  margin: 0 0 12px;
  font-size: 28px;
  line-height: 1.45;
}

.post-body {
  padding-top: 8px;
}

.post-body h2 {
  margin: 40px 0 12px;
  font-size: 20px;
  line-height: 1.5;
}

.post-body h3 {
  margin: 28px 0 10px;
  font-size: 17px;
}

.post-body p {
  margin: 0 0 18px;
}

.post-body ul,
.post-body ol {
  margin: 0 0 18px;
  padding-left: 22px;
}

.post-body li {
  margin-bottom: 6px;
}

.post-body code {
  padding: 2px 6px;
  font-size: 0.9em;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  background: var(--code-bg);
  border-radius: 4px;
}

.post-body pre {
  margin: 0 0 20px;
  padding: 16px 18px;
  overflow-x: auto;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.post-body pre code {
  padding: 0;
  font-size: 13.5px;
  line-height: 1.7;
  background: none;
}

.post-body blockquote {
  margin: 0 0 20px;
  padding: 4px 16px;
  color: var(--muted);
  border-left: 3px solid var(--border);
}

.post-body table {
  width: 100%;
  margin: 0 0 22px;
  font-size: 14.5px;
  border-collapse: collapse;
}

.post-body th,
.post-body td {
  padding: 10px 12px;
  text-align: left;
  border: 1px solid var(--border);
}

.post-body th {
  background: var(--soft);
  font-weight: 600;
}

.post-nav {
  margin: 30px 0 40px;
  padding-top: 22px;
  border-top: 1px solid var(--border);
  font-size: 15px;
}

/* 关于页 */
.page {
  padding: 46px 0 30px;
}

.page h1 {
  margin: 0 0 20px;
  font-size: 26px;
}

.page h2 {
  margin: 34px 0 12px;
  font-size: 18px;
}

.page p {
  margin: 0 0 16px;
}

/* 页脚 */
.site-footer {
  margin-top: 30px;
  padding: 30px 0 40px;
  background: var(--soft);
  border-top: 1px solid var(--border);
  font-size: 14px;
  color: var(--muted);
}

.site-footer p {
  margin: 0 0 6px;
}

.site-footer .footer-meta span {
  margin: 0 6px;
}

@media (max-width: 600px) {
  .hero {
    padding: 36px 0 26px;
  }
  .hero h1 {
    font-size: 24px;
  }
  .post-header h1 {
    font-size: 23px;
  }
  .post-body pre {
    padding: 14px;
  }
}