:root {
  --fg: #1a1a1a;
  --muted: #767676;
  --bg: #fdfdfc;
  --line: #e8e8e4;
  --accent: #1a1a1a;
  --code-bg: #f4f4f1;
}

@media (prefers-color-scheme: dark) {
  :root {
    --fg: #e6e6e3;
    --muted: #9a9a96;
    --bg: #131313;
    --line: #2a2a2a;
    --accent: #f0f0ec;
    --code-bg: #1d1d1d;
  }
}

* { box-sizing: border-box; }

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

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: 1.78;
  letter-spacing: 0.01em;
}

.wrap {
  max-width: 700px;
  margin: 0 auto;
  padding: 0 22px;
}

/* ---------- 顶部 ---------- */
.site-head {
  padding: 34px 0 22px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--line);
}

.brand {
  font-size: 16px;
  font-weight: 600;
  color: var(--fg);
  text-decoration: none;
  letter-spacing: 0.04em;
}

.nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  margin-left: 20px;
  transition: color 0.15s;
}

.nav a:hover, .nav a.active { color: var(--fg); }

/* ---------- 首页介绍 ---------- */
.intro { padding: 54px 0 40px; }

.intro h1 {
  margin: 0 0 10px;
  font-size: 30px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.intro .tagline {
  color: var(--muted);
  font-size: 15px;
  margin: 0 0 22px;
}

.intro p {
  margin: 0 0 14px;
  font-size: 15.5px;
  color: var(--fg);
}

.intro p.lead { font-size: 16.5px; }

/* ---------- 动态列表 ---------- */
.section-title {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 10px 0 26px;
  font-size: 13px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}

.section-title::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line);
}

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

.posts li { border-bottom: 1px solid var(--line); }

.posts a.post-link {
  display: block;
  padding: 22px 0;
  text-decoration: none;
  color: inherit;
  transition: opacity 0.15s;
}

.posts a.post-link:hover { opacity: 0.62; }

.posts h2 {
  margin: 0 0 6px;
  font-size: 18px;
  font-weight: 600;
  line-height: 1.5;
}

.posts .meta {
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 8px;
  font-variant-numeric: tabular-nums;
}

.posts .summary {
  margin: 0;
  font-size: 14.5px;
  color: var(--muted);
  line-height: 1.7;
}

.empty {
  padding: 40px 0;
  color: var(--muted);
  font-size: 14.5px;
}

/* ---------- 文章 ---------- */
.article { padding: 46px 0 20px; }

.article h1 {
  font-size: 27px;
  font-weight: 600;
  margin: 0 0 12px;
  line-height: 1.45;
}

.article .meta {
  font-size: 13px;
  color: var(--muted);
  padding-bottom: 26px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 30px;
  font-variant-numeric: tabular-nums;
}

.prose h2 { font-size: 21px; margin: 38px 0 14px; font-weight: 600; }
.prose h3 { font-size: 17.5px; margin: 30px 0 12px; font-weight: 600; }
.prose p { margin: 0 0 18px; }
.prose ul, .prose ol { margin: 0 0 18px; padding-left: 22px; }
.prose li { margin-bottom: 8px; }
.prose blockquote {
  margin: 0 0 18px;
  padding: 2px 0 2px 16px;
  border-left: 2px solid var(--line);
  color: var(--muted);
}
.prose code {
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 13.5px;
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
}
.prose pre {
  background: var(--code-bg);
  padding: 16px 18px;
  border-radius: 8px;
  overflow-x: auto;
  margin: 0 0 18px;
}
.prose pre code { background: none; padding: 0; font-size: 13px; line-height: 1.65; }
.prose img { max-width: 100%; border-radius: 6px; }
.prose a,
.intro a,
.section a,
.entry a,
.hint a {
  color: inherit;
  text-decoration: underline;
  text-decoration-color: var(--muted);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color 0.15s;
}

.prose a:hover,
.intro a:hover,
.section a:hover,
.entry a:hover,
.hint a:hover { color: var(--muted); }
.prose hr { border: none; border-top: 1px solid var(--line); margin: 34px 0; }

/* ---------- 关于页 ---------- */
.section { padding: 20px 0 34px; }
.section h2 {
  font-size: 13px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 22px;
  font-weight: 500;
}

.entry { margin-bottom: 30px; }
.entry:last-child { margin-bottom: 0; }

.entry-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 4px;
}

.entry-title { font-weight: 600; font-size: 16px; }
.entry-sub { color: var(--muted); font-size: 14px; }
.entry-date { color: var(--muted); font-size: 13px; font-variant-numeric: tabular-nums; white-space: nowrap; }
.entry ul { margin: 10px 0 0; padding-left: 20px; }
.entry li { margin-bottom: 6px; font-size: 15px; }

.skills { list-style: none; margin: 0; padding: 0; }
.skills li { margin-bottom: 12px; font-size: 15px; }
.skills strong { font-weight: 600; margin-right: 8px; }

/* ---------- 页脚 ---------- */
.site-foot {
  margin-top: 40px;
  padding: 26px 0 46px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 12.5px;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

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

/* ---------- 后台 ---------- */
.admin-wrap { max-width: 860px; }

.admin-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 30px 0 20px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 28px;
}

.admin-head h1 { font-size: 20px; margin: 0; font-weight: 600; }

.field { margin-bottom: 18px; }
.field label {
  display: block;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 7px;
  letter-spacing: 0.05em;
}

input[type="text"], input[type="date"], textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: transparent;
  color: var(--fg);
  font-size: 14.5px;
  font-family: inherit;
}

input:focus, textarea:focus { outline: none; border-color: var(--muted); }

textarea { min-height: 320px; resize: vertical; line-height: 1.7; font-family: ui-monospace, SFMono-Regular, Consolas, monospace; font-size: 13.5px; }

.row { display: flex; gap: 14px; flex-wrap: wrap; }
.row .field { flex: 1; min-width: 200px; }

.btn {
  padding: 9px 18px;
  border: 1px solid var(--fg);
  background: var(--fg);
  color: var(--bg);
  border-radius: 6px;
  font-size: 14px;
  cursor: pointer;
  font-family: inherit;
  transition: opacity 0.15s;
}

.btn:hover { opacity: 0.82; }
.btn.ghost { background: transparent; color: var(--fg); border-color: var(--line); }
.btn.danger { background: transparent; color: #b42318; border-color: #f0cfcb; }

.admin-list { list-style: none; padding: 0; margin: 34px 0 0; }
.admin-list li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}
.admin-list .t { font-size: 15px; }
.admin-list .d { font-size: 12.5px; color: var(--muted); margin-top: 3px; }
.admin-list .ops { display: flex; gap: 8px; flex-shrink: 0; }
.admin-list .ops button { padding: 5px 12px; font-size: 13px; }

.hint { font-size: 13px; color: var(--muted); line-height: 1.7; }
.status { font-size: 13.5px; margin-left: 12px; }
.status.ok { color: #17803d; }
.status.err { color: #b42318; }