:root{
  --ink:#1a1a1a; --sub:#666; --line:#e8e8e8; --brand:#1a3a5c; --bg:#fff; --soft:#f7f7f5;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.8;font-size:16px;-webkit-font-smoothing:antialiased}
.serif{font-family:"Songti SC","STSong","SimSun","Noto Serif SC",serif}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:1080px;margin:0 auto;padding:0 24px}

/* 顶栏 */
header.site{border-bottom:1px solid var(--line);position:sticky;top:0;background:rgba(255,255,255,.95);backdrop-filter:blur(6px);z-index:10}
header.site .wrap{display:flex;justify-content:space-between;align-items:center;height:64px}
.brand{font-weight:700;font-size:18px;letter-spacing:.02em}
nav a{margin-left:28px;color:var(--ink);font-size:15px}
nav a:hover{color:var(--brand);text-decoration:none}

/* Hero */
.hero{padding:88px 0 72px}
.hero .wrap{display:grid;grid-template-columns:1fr 320px;gap:64px;align-items:center}
.kicker{font-size:14px;color:var(--brand);letter-spacing:.15em;margin-bottom:14px}
.hero h1{font-size:46px;line-height:1.3;margin-bottom:6px}
.hero .role{font-size:17px;color:var(--sub);margin-bottom:22px}
.hero .role b{color:var(--ink)}
.hero p.bio{font-size:16px;color:#333;margin-bottom:32px;max-width:560px}
.btn{display:inline-block;padding:12px 26px;border:1px solid var(--ink);color:var(--ink);font-size:15px;margin-right:14px;transition:.2s}
.btn:hover{background:var(--ink);color:#fff;text-decoration:none}
.btn.primary{background:var(--brand);border-color:var(--brand);color:#fff}
.btn.primary:hover{background:#122b45;border-color:#122b45}
.hero img{width:320px;border-radius:6px;display:block}

/* 区块 */
section{padding:64px 0;border-top:1px solid var(--line)}
section h2{font-size:28px;margin-bottom:8px}
section .lead{color:var(--sub);margin-bottom:40px;font-size:15px}

/* 领域 */
.fields{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}
.field{background:var(--bg);padding:26px 24px;transition:.2s}
.field:hover{background:var(--soft)}
.field h3{font-size:17px;margin-bottom:6px}
.field p{font-size:13.5px;color:var(--sub);line-height:1.7}
.field.hl{background:var(--brand);color:#fff}
.field.hl p{color:#c9d6e4}
.field.hl:hover{background:#15304e}

/* 文章 */
.posts{max-width:760px}
.post{display:block;padding:26px 0;border-bottom:1px solid var(--line);color:var(--ink)}
.post:hover{text-decoration:none;background:var(--soft);margin:0 -16px;padding-left:16px;padding-right:16px;border-radius:4px}
.post .date{font-size:13px;color:var(--sub);letter-spacing:.05em}
.post h3{font-size:20px;margin:6px 0 8px}
.post p{font-size:14.5px;color:var(--sub)}
.post .soon{display:inline-block;font-size:12px;color:var(--brand);border:1px solid var(--brand);border-radius:3px;padding:1px 8px;margin-left:10px;vertical-align:2px}

/* 关于 */
.about{display:grid;grid-template-columns:220px 1fr;gap:56px;align-items:start}
.about img{width:220px;border-radius:6px}
.about h2{margin-bottom:16px}
.about p{margin-bottom:14px;font-size:15px;color:#333}
.about .cred{font-size:14px;color:var(--sub)}
.about .cred li{list-style:none;padding:5px 0;border-bottom:1px dashed var(--line)}
.about .cred b{display:inline-block;width:88px;color:var(--ink);font-weight:600}

/* 联系 */
.contact{padding:72px 0;text-align:center;background:var(--soft)}
.contact h2{font-size:30px;margin-bottom:10px}
.contact p{color:var(--sub);margin-bottom:26px}
.contact .mail{font-size:20px;border-bottom:2px solid var(--brand);padding-bottom:2px}

footer.site{border-top:1px solid var(--line);padding:28px 0;font-size:13px;color:var(--sub)}
footer.site .wrap{display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px}

/* 文章页 */
.article{max-width:720px;margin:0 auto;padding:64px 24px 80px}
.article .date{font-size:13.5px;color:var(--sub);margin-bottom:12px}
.article h1{font-size:34px;line-height:1.4;margin-bottom:14px}
.article .meta{padding:14px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);font-size:14px;color:var(--sub);margin-bottom:40px}
.article .meta b{color:var(--ink)}
.article h2{font-size:24px;margin:44px 0 16px}
.article h3{font-size:19px;margin:32px 0 12px}
.article p{margin-bottom:18px;font-size:16.5px}
.article ul,.article ol{margin:0 0 18px 22px}
.article li{margin-bottom:8px;font-size:16px}
.article blockquote{border-left:3px solid var(--brand);padding:4px 0 4px 18px;color:#444;margin:0 0 18px;background:var(--soft)}
.faq{border:1px solid var(--line);border-radius:6px;padding:24px 28px;margin:48px 0 24px;background:var(--soft)}
.faq h2{margin-top:0}
.faq dl{margin:0}
.faq dt{font-weight:600;margin-top:16px;font-size:15.5px}
.faq dd{margin:4px 0 0;color:#444;font-size:15px}
.author-card{margin-top:48px;padding:28px;border:1px solid var(--line);border-radius:6px;display:flex;gap:22px;align-items:center}
.author-card img{width:84px;border-radius:4px}
.author-card .n{font-size:17px;font-weight:700;margin-bottom:4px}
.author-card .d{font-size:13.5px;color:var(--sub);line-height:1.7}

@media (max-width:860px){
  .hero{padding:56px 0}
  .hero .wrap{grid-template-columns:1fr;gap:36px}
  .hero img{width:240px}
  .hero h1{font-size:34px}
  .fields{grid-template-columns:1fr 1fr}
  .about{grid-template-columns:1fr;gap:28px}
  .about img{width:180px}
  nav a{margin-left:16px;font-size:14px}
  .article h1{font-size:27px}
  .hide-m{display:none}
}