:root{--ink:#1a1a22;--muted:#6b7280;--accent:#2f6fed;--bg:#fff;--line:#eef0f5}
*{box-sizing:border-box}body{margin:0;font:17px/1.7 Georgia,'Times New Roman',serif;color:var(--ink);background:var(--bg)}
.wrap{max-width:720px;margin:0 auto;padding:0 20px}
header.site{border-bottom:1px solid var(--line);font-family:-apple-system,'Segoe UI',Roboto,sans-serif}
header.site .wrap{display:flex;align-items:center;justify-content:space-between;padding:16px 20px}
.brand{font-weight:800;font-size:20px;color:var(--ink);text-decoration:none;letter-spacing:-.02em}
nav a{color:var(--muted);text-decoration:none;margin-left:18px;font-size:15px}
nav a:hover{color:var(--accent)}
main{padding:36px 20px 60px}
h1{font-size:34px;line-height:1.2;letter-spacing:-.02em;margin:.2em 0 .4em}
h2{font-size:25px;margin:1.6em 0 .5em}h3{font-size:20px;margin:1.4em 0 .4em}
a{color:var(--accent)}img{max-width:100%;height:auto;border-radius:8px}
table{border-collapse:collapse;width:100%;margin:1em 0;font-size:15px;font-family:-apple-system,'Segoe UI',sans-serif}
th,td{border:1px solid var(--line);padding:8px 10px;text-align:left}th{background:#f7f8fc}
.meta{color:var(--muted);font-size:14px;font-family:-apple-system,'Segoe UI',sans-serif;margin-bottom:24px}
.post-list{list-style:none;padding:0}.post-list li{border-bottom:1px solid var(--line);padding:22px 0}
.post-list h2{margin:0 0 6px;font-size:23px}.post-list h2 a{color:var(--ink);text-decoration:none}
.post-list h2 a:hover{color:var(--accent)}.post-list p{margin:.3em 0;color:#444}
.hero{padding:10px 0 26px;border-bottom:1px solid var(--line);margin-bottom:6px}
.hero h1{font-size:30px}.hero p{color:var(--muted);font-size:18px}
.small{color:var(--muted);font-size:13px}
.cats{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px;font-family:-apple-system,'Segoe UI',sans-serif}
.cat{font-size:13px;padding:6px 12px;border:1px solid var(--line);border-radius:16px;color:var(--ink);text-decoration:none}
.cat:hover{border-color:var(--accent);color:var(--accent)}
.author-box,.related,.toc,.key-takeaways,.breadcrumb,.ad-slot{font-family:-apple-system,'Segoe UI',sans-serif;font-size:15px}
figcaption{font-family:-apple-system,'Segoe UI',sans-serif}