:root {
  --ink: #2c3340;
  --muted: #6b7380;
  --soft: #8b939e;
  --line: #e6e9ee;
  --paper: #f7f5f1;
  --card: #ffffff;
  --accent: #3d6b8c;
  --accent-soft: #e8f0f5;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(180deg, #faf8f5 0%, var(--paper) 40%, #f3f1ec 100%);
  font-family: "Source Han Serif SC", "Noto Serif SC", "Songti SC", "SimSun", Georgia, serif;
  line-height: 1.75;
  min-height: 100vh;
}

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

.wrap {
  width: min(720px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  padding: 28px 0 8px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 40px;
}

.site-header .wrap {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.brand {
  font-size: 22px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: 0.06em;
  text-decoration: none;
}
.brand:hover { text-decoration: none; color: var(--accent); }

.brand small {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  font-weight: 400;
  color: var(--soft);
  letter-spacing: 0.12em;
  font-family: ui-sans-serif, system-ui, sans-serif;
}

nav {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  font-family: ui-sans-serif, system-ui, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 14px;
}

nav a {
  color: var(--muted);
  text-decoration: none;
}
nav a:hover,
nav a.active {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--ink);
}

main { padding-bottom: 64px; }

h1 {
  font-size: clamp(28px, 5vw, 36px);
  font-weight: 700;
  line-height: 1.35;
  margin: 0 0 18px;
}

h2 {
  font-size: 22px;
  margin: 36px 0 14px;
  font-weight: 700;
}

.lead {
  font-size: 17px;
  color: var(--muted);
  margin: 0 0 28px;
}

.meta {
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-size: 13px;
  color: var(--soft);
  margin-bottom: 24px;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 22px 24px;
  margin-bottom: 16px;
}

.card h3 {
  margin: 0 0 8px;
  font-size: 18px;
}

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

.card .date {
  display: block;
  margin-top: 12px;
  font-family: ui-sans-serif, system-ui, sans-serif;
  font-size: 12px;
  color: var(--soft);
}

.note {
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  padding: 14px 16px;
  border-radius: 0 10px 10px 0;
  color: var(--muted);
  font-size: 14px;
  font-family: ui-sans-serif, system-ui, "PingFang SC", "Microsoft YaHei", sans-serif;
}

.prose p { margin: 0 0 16px; color: var(--ink); }
.prose ul {
  margin: 0 0 16px;
  padding-left: 1.2em;
  color: var(--muted);
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 28px 0 40px;
  color: var(--soft);
  font-size: 12px;
  font-family: ui-sans-serif, system-ui, "PingFang SC", "Microsoft YaHei", sans-serif;
  text-align: center;
  line-height: 1.8;
}

.site-footer strong {
  font-weight: 600;
  color: var(--muted);
}

@media (max-width: 560px) {
  .site-header { padding-top: 20px; margin-bottom: 28px; }
  .card { padding: 18px; }
}