:root{
  --paper:#faf8f1;
  --ink:#26221c;
  --muted:#8a8272;
  --line:#e8e0d0;
  --accent:#9a6b23;
  --accent-dark:#7c5518;
  --navy:#1f3a5f;
  --card:#fffdf8;
}
*{margin:0;padding:0;box-sizing:border-box}
body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  background:var(--paper);
  color:var(--ink);
  line-height:1.7;
}
.wrap{max-width:760px;margin:0 auto;padding:0 20px}

/* 页眉 */
.site-header{
  border-bottom:1px solid var(--line);
  background:rgba(250,248,241,.92);
  position:sticky;top:0;z-index:10;
  backdrop-filter:blur(6px);
}
.site-header .wrap{
  display:flex;justify-content:space-between;align-items:center;height:64px;
}
.brand{
  font-family:"Songti SC","Noto Serif SC",serif;
  font-size:22px;font-weight:700;color:var(--ink);
  text-decoration:none;letter-spacing:2px;
}
.brand-sub{font-size:13px;color:var(--accent);letter-spacing:4px;margin-left:8px;font-weight:400}
nav a{margin-left:20px;color:var(--muted);text-decoration:none;font-size:15px}
nav a.active,nav a:hover{color:var(--ink)}

/* 首页大标题 */
.hero{padding:56px 0 36px;text-align:center}
.hero h1{
  font-family:"Songti SC","Noto Serif SC",serif;
  font-size:34px;letter-spacing:8px;margin-bottom:14px;
}
.hero p{color:var(--muted);font-size:15px;max-width:540px;margin:0 auto}

/* 标签筛选 */
.tags{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-bottom:28px}
.tag-btn{
  border:1px solid var(--line);background:transparent;border-radius:999px;
  padding:5px 16px;font-size:13px;color:var(--muted);cursor:pointer;
}
.tag-btn.on{background:var(--navy);border-color:var(--navy);color:#fff}

/* 文章卡片 */
.posts{display:grid;gap:18px;padding-bottom:20px}
.card{
  display:block;background:var(--card);border:1px solid var(--line);
  border-radius:12px;padding:24px;text-decoration:none;color:inherit;
  transition:transform .15s,box-shadow .15s;
}
.card:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(31,58,95,.08)}
.card-date{font-size:12px;color:var(--muted);letter-spacing:1px;margin-bottom:8px}
.card-title{
  font-family:"Songti SC","Noto Serif SC",serif;
  font-size:21px;margin-bottom:10px;color:var(--ink);
}
.card-excerpt{font-size:14px;color:var(--muted);margin-bottom:12px}
.tag{
  display:inline-block;font-size:12px;color:var(--accent-dark);
  background:#f3e9d2;border-radius:4px;padding:2px 8px;margin-right:6px;
}

/* 页脚 */
.site-footer{
  border-top:1px solid var(--line);margin-top:40px;
  padding:28px 0;text-align:center;color:var(--muted);font-size:13px;
}
.disclaimer{font-size:12px;margin-top:6px}

/* 文章页 */
.article{padding:40px 0}
.article-date{color:var(--muted);font-size:13px;letter-spacing:1px}
.article-title{
  font-family:"Songti SC","Noto Serif SC",serif;
  font-size:30px;margin:10px 0 14px;line-height:1.4;
}
.article-tags{margin-bottom:28px}
.article-content p{margin-bottom:1.2em;font-size:16px;line-height:1.95}
.article-content h2{
  font-size:20px;margin:1.6em 0 .8em;
  font-family:"Songti SC","Noto Serif SC",serif;
}
.article-content blockquote{
  border-left:3px solid var(--accent);padding:6px 16px;
  color:var(--muted);margin:1.2em 0;background:#f6efe0;
  border-radius:0 8px 8px 0;font-size:15px;
}
.back{display:inline-block;margin-top:32px;color:var(--navy);text-decoration:none}

/* 关于页 */
.about{padding:48px 0}
.about h1{
  font-family:"Songti SC","Noto Serif SC",serif;
  font-size:28px;margin-bottom:18px;letter-spacing:6px;
}
.about p{margin-bottom:1em;color:#444;line-height:1.9}

@media(max-width:600px){
  .hero h1{font-size:26px;letter-spacing:4px}
  .article-title{font-size:24px}
  .card{padding:20px}
}