:root {
  --bg: #ffffff;
  --bg-soft: #f6f7f9;
  --fg: #1b1f24;
  --fg-muted: #5b6472;
  --border: #e3e6ea;
  --accent: #0b6bcb;
  --accent-soft: #eaf2fc;
  --code-bg: #f2f3f5;
  --maxw: 44rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14171b;
    --bg-soft: #1b1f25;
    --fg: #e6e9ed;
    --fg-muted: #9aa4b2;
    --border: #2a3038;
    --accent: #6cb0f5;
    --accent-soft: #1c2735;
    --code-bg: #22262d;
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.75 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* ---------- header ---------- */
.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}

.site-header .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 1.25rem;
  padding-top: 1.6rem;
  padding-bottom: 1.6rem;
}

.site-title {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--fg);
  text-decoration: none;
}

.site-title span {
  color: var(--accent);
}

.site-nav {
  margin-left: auto;
  display: flex;
  gap: 1rem;
  font-size: 0.92rem;
}

.site-nav a {
  color: var(--fg-muted);
  text-decoration: none;
}

.site-nav a:hover { color: var(--accent); }

/* ---------- main ---------- */
main { padding: 2.5rem 0 1rem; }

h1 {
  font-size: 1.9rem;
  line-height: 1.3;
  letter-spacing: -0.02em;
  margin: 0 0 0.5rem;
}

.lead {
  color: var(--fg-muted);
  font-size: 1.05rem;
  margin: 0 0 2.25rem;
}

h2 {
  font-size: 1.25rem;
  margin: 2.25rem 0 0.75rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border);
}

h3 { font-size: 1.05rem; margin: 1.75rem 0 0.5rem; }

p { margin: 0 0 1.1rem; }

a { color: var(--accent); }

code {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.88em;
  background: var(--code-bg);
  padding: 0.12em 0.38em;
  border-radius: 4px;
}

pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.9rem 1rem;
  overflow-x: auto;
  font-size: 0.86rem;
  line-height: 1.6;
}

pre code { background: none; padding: 0; font-size: inherit; }

blockquote {
  margin: 1.4rem 0;
  padding: 0.2rem 0 0.2rem 1rem;
  border-left: 3px solid var(--accent);
  color: var(--fg-muted);
}

ul, ol { padding-left: 1.35rem; margin: 0 0 1.1rem; }

li { margin: 0.3rem 0; }

hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 2.5rem 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.4rem 0;
  font-size: 0.94rem;
}

th, td {
  border: 1px solid var(--border);
  padding: 0.5rem 0.7rem;
  text-align: left;
}

th { background: var(--bg-soft); font-weight: 600; }

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

.post-list > li {
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--border);
}

.post-list > li:last-child { border-bottom: 0; }

.post-list h2 {
  margin: 0 0 0.35rem;
  padding: 0;
  border: 0;
  font-size: 1.12rem;
}

.post-list p {
  margin: 0 0 0.5rem;
  color: var(--fg-muted);
  font-size: 0.95rem;
}

.post-meta {
  font-size: 0.84rem;
  color: var(--fg-muted);
  font-variant-numeric: tabular-nums;
}

.tag {
  display: inline-block;
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: 999px;
  padding: 0.05rem 0.55rem;
  font-size: 0.76rem;
  margin-left: 0.4rem;
}

/* ---------- article ---------- */
.article-meta {
  color: var(--fg-muted);
  font-size: 0.88rem;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.back {
  display: inline-block;
  margin-bottom: 1.5rem;
  font-size: 0.9rem;
  color: var(--fg-muted);
  text-decoration: none;
}

.back:hover { color: var(--accent); }

/* ---------- footer ---------- */
.site-footer {
  margin-top: 3.5rem;
  border-top: 1px solid var(--border);
  background: var(--bg-soft);
  font-size: 0.86rem;
  color: var(--fg-muted);
}

.site-footer .wrap { padding-top: 1.6rem; padding-bottom: 1.8rem; }

.site-footer p { margin: 0 0 0.4rem; }

.site-footer a { color: var(--fg-muted); }

.site-footer a:hover { color: var(--accent); }

/* ICP 备案号:合规审计要求,每页页脚必须展示 */
.icp {
  color: var(--fg-muted);
}

.icp a {
  color: var(--fg-muted);
  text-decoration: none;
  border-bottom: 1px dotted var(--fg-muted);
}

.icp a:hover { color: var(--accent); border-bottom-color: var(--accent); }