:root {
  --bg: #fdfcfa;
  --surface: #ffffff;
  --ink: #1b1917;
  --muted: #7b7369;
  --line: #e8e2da;
  --accent: #a0522d;
  --accent-soft: #f6efe9;
  --radius: 10px;
  --serif: Georgia, "Times New Roman", "Songti SC", "Noto Serif CJK SC", "Source Han Serif SC", serif;
  --sans: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

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

a:hover {
  text-decoration: underline;
}

img {
  max-width: 100%;
  display: block;
}

.container {
  max-width: 820px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- 页头 ---------- */

.site-header {
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}

.site-header .container {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding-top: 26px;
  padding-bottom: 22px;
  flex-wrap: wrap;
}

.site-title {
  font-family: var(--serif);
  font-size: 27px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--ink);
  margin: 0;
}

.site-title:hover {
  text-decoration: none;
  color: var(--accent);
}

.site-nav {
  display: flex;
  gap: 18px;
  font-size: 14px;
  color: var(--muted);
}

.site-desc {
  color: var(--muted);
  font-size: 15px;
  margin: 4px 0 0;
}

/* ---------- 文章列表 ---------- */

main.container {
  padding-top: 40px;
  padding-bottom: 64px;
  min-height: 60vh;
}

.tag-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 30px;
}

.tag-chip {
  font-size: 13px;
  padding: 4px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--muted);
  cursor: pointer;
}

.tag-chip:hover {
  text-decoration: none;
  border-color: var(--accent);
  color: var(--accent);
}

.tag-chip.is-active {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
}

.post-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.post-item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  padding: 26px 0;
  border-bottom: 1px solid var(--line);
}

.post-item.has-cover {
  grid-template-columns: 1fr 150px;
  gap: 24px;
  align-items: start;
}

.post-title {
  font-family: var(--serif);
  font-size: 21px;
  font-weight: 600;
  margin: 0 0 6px;
  line-height: 1.4;
}

.post-title a {
  color: var(--ink);
}

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

.post-summary {
  color: var(--muted);
  font-size: 15px;
  margin: 0 0 10px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.post-meta {
  font-size: 13px;
  color: #9a9188;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.post-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.post-tags span {
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: 4px;
  padding: 1px 8px;
  font-size: 12px;
}

.post-cover {
  width: 150px;
  height: 100px;
  object-fit: cover;
  border-radius: var(--radius);
  background: var(--accent-soft);
}

.empty {
  color: var(--muted);
  text-align: center;
  padding: 80px 0;
}

/* ---------- 文章详情 ---------- */

.article-head {
  padding: 44px 0 24px;
  border-bottom: 1px solid var(--line);
}

.article-title {
  font-family: var(--serif);
  font-size: 32px;
  line-height: 1.35;
  margin: 0 0 12px;
}

.article-cover {
  width: 100%;
  border-radius: var(--radius);
  margin: 28px 0 8px;
}

.article-body {
  padding: 28px 0 60px;
  font-size: 16.5px;
}

.article-body h1,
.article-body h2,
.article-body h3 {
  font-family: var(--serif);
  line-height: 1.4;
  margin: 34px 0 12px;
}

.article-body h1 {
  font-size: 26px;
}
.article-body h2 {
  font-size: 22px;
}
.article-body h3 {
  font-size: 18px;
}

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

.article-body blockquote {
  margin: 20px 0;
  padding: 2px 0 2px 18px;
  border-left: 3px solid var(--accent);
  color: var(--muted);
}

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

.article-body code {
  background: var(--accent-soft);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 14px;
  font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
}

.article-body pre {
  background: #1f1d1c;
  color: #f2efe9;
  padding: 16px 18px;
  border-radius: var(--radius);
  overflow-x: auto;
  margin: 0 0 20px;
}

.article-body pre code {
  background: none;
  padding: 0;
  color: inherit;
}

.article-body img {
  border-radius: var(--radius);
  margin: 8px 0;
}

.article-body table {
  border-collapse: collapse;
  width: 100%;
  margin: 0 0 20px;
}

.article-body th,
.article-body td {
  border: 1px solid var(--line);
  padding: 8px 12px;
}

.article-body hr {
  border: none;
  border-top: 1px solid var(--line);
  margin: 32px 0;
}

.back-link {
  display: inline-block;
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 20px;
}

/* ---------- 页脚 ---------- */

.site-footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
  padding: 24px 0 40px;
  text-align: center;
}

@media (max-width: 560px) {
  .post-item.has-cover {
    grid-template-columns: 1fr;
  }
  .post-cover {
    width: 100%;
    height: auto;
    aspect-ratio: 3 / 2;
    order: -1;
  }
  .article-title {
    font-size: 26px;
  }
}