/* ============================================================
   博客样式
   ------------------------------------------------------------
   想换颜色？改下面 --accent 那一行的色号就行（比如 #e0523f）。
   想换字体大小？改 body 里的 font-size。
   ============================================================ */

:root {
  --bg: #fbfbfa;
  --fg: #24292f;
  --muted: #6b7280;
  --accent: #2f6feb;
  --border: #e7e8ea;
  --card: #ffffff;
  --code-bg: #f4f5f7;
  --quote-bg: #f7f8fa;
  --max: 720px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
          "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC",
          "Noto Sans CJK SC", sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16181d;
    --fg: #e3e6ea;
    --muted: #98a1ae;
    --accent: #7aa7ff;
    --border: #2b2f36;
    --card: #1c1f25;
    --code-bg: #23272e;
    --quote-bg: #1f232a;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.85;
  letter-spacing: 0.01em;
  word-wrap: break-word;
}

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 22px;
}

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

/* ---------------- 顶部 ---------------- */

.site-header {
  border-bottom: 1px solid var(--border);
  padding: 34px 0 22px;
  margin-bottom: 44px;
}

.site-title {
  display: inline-block;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--fg);
  letter-spacing: 0.02em;
}
.site-title:hover { text-decoration: none; color: var(--accent); }

.site-sub {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.site-nav { margin-top: 16px; }

.site-nav a {
  display: inline-block;
  margin-right: 18px;
  color: var(--muted);
  font-size: 0.95rem;
}
.site-nav a:hover { color: var(--accent); }

/* ---------------- 首页文章列表 ---------------- */

.post-list { margin: 0 0 40px; }

.post-item {
  padding: 26px 0;
  border-bottom: 1px solid var(--border);
}
.post-item:first-child { padding-top: 0; }
.post-item:last-child { border-bottom: none; }

.post-date {
  display: block;
  color: var(--muted);
  font-size: 0.82rem;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
}

.post-item .post-title {
  margin: 6px 0 0;
  font-size: 1.28rem;
  line-height: 1.5;
}
.post-item .post-title a { color: var(--fg); }
.post-item .post-title a:hover { color: var(--accent); text-decoration: none; }

.post-summary {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.75;
}

.post-tags { margin: 10px 0 0; }

/* ---------------- 标签 ---------------- */

.tags { display: inline; }

.tag {
  display: inline-block;
  padding: 1px 10px;
  margin: 2px 6px 2px 0;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--card);
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.7;
}
.tag:hover { color: var(--accent); border-color: var(--accent); text-decoration: none; }

.tag-cloud { margin: 18px 0 34px; }
.tag-count { opacity: 0.6; }

.tag-section { margin-bottom: 30px; }
.tag-section h2 {
  font-size: 1.05rem;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border);
}

.plain-list { list-style: none; padding: 0; margin: 0; }
.plain-list li {
  padding: 7px 0;
  border-bottom: 1px dashed var(--border);
  font-size: 0.95rem;
}
.plain-list time {
  color: var(--muted);
  font-size: 0.82rem;
  font-variant-numeric: tabular-nums;
  margin-right: 10px;
}

/* ---------------- 文章正文 ---------------- */

.post-header { margin-bottom: 30px; }

.post-header .post-title {
  margin: 0 0 10px;
  font-size: 1.75rem;
  line-height: 1.45;
}

.post-meta {
  margin: 0;
  color: var(--muted);
  font-size: 0.85rem;
}

.post-body h1, .post-body h2, .post-body h3,
.post-body h4, .post-body h5, .post-body h6 {
  line-height: 1.5;
  margin: 2em 0 0.7em;
  font-weight: 700;
}
.post-body h2 {
  font-size: 1.3rem;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border);
}
.post-body h3 { font-size: 1.12rem; }
.post-body h4 { font-size: 1rem; }

.post-body p { margin: 1.15em 0; }

.post-body img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  display: block;
  margin: 1.5em auto;
}

.post-body ul, .post-body ol { padding-left: 1.5em; margin: 1.1em 0; }
.post-body li { margin: 0.4em 0; }

.post-body blockquote {
  margin: 1.4em 0;
  padding: 2px 18px;
  border-left: 3px solid var(--accent);
  background: var(--quote-bg);
  border-radius: 0 6px 6px 0;
  color: var(--muted);
}
.post-body blockquote p { margin: 0.7em 0; }

.post-body code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--code-bg);
  padding: 0.15em 0.42em;
  border-radius: 4px;
}

.post-body pre {
  background: var(--code-bg);
  padding: 15px 17px;
  border-radius: 8px;
  overflow-x: auto;
  line-height: 1.65;
  font-size: 0.88rem;
  border: 1px solid var(--border);
}
.post-body pre code {
  background: none;
  padding: 0;
  font-size: inherit;
}

.post-body hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2.4em 0;
}

.post-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.4em 0;
  font-size: 0.92rem;
}
.post-body th, .post-body td {
  border: 1px solid var(--border);
  padding: 8px 12px;
  text-align: left;
}
.post-body th { background: var(--code-bg); }

/* ---------------- 上下篇 / 返回 ---------------- */

.post-nav {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  margin: 52px 0 0;
  padding-top: 22px;
  border-top: 1px solid var(--border);
  font-size: 0.92rem;
}
.post-nav a { max-width: 48%; }
.post-nav .next { margin-left: auto; text-align: right; }

.back-home {
  margin: 26px 0 0;
  font-size: 0.92rem;
}

/* ---------------- 其他 ---------------- */

.empty, .not-found {
  color: var(--muted);
  text-align: center;
}
.not-found { padding: 60px 0; }
.not-found h1 { font-size: 3.4rem; margin: 0; color: var(--border); }

.site-footer {
  margin-top: 70px;
  padding: 26px 0 40px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.84rem;
}
.site-footer p { margin: 4px 0; }

/* ---------------- 手机 ---------------- */

@media (max-width: 560px) {
  body { font-size: 16px; }
  .wrap { padding: 0 18px; }
  .site-header { padding: 26px 0 18px; margin-bottom: 30px; }
  .site-title { font-size: 1.3rem; }
  .post-item { padding: 22px 0; }
  .post-item .post-title { font-size: 1.15rem; }
  .post-header .post-title { font-size: 1.4rem; }
  .post-nav { flex-direction: column; }
  .post-nav a { max-width: 100%; }
  .post-nav .next { margin-left: 0; text-align: left; }
}