:root{
  --bg:#f6f7f9; --card:#ffffff; --ink:#1f2329; --sub:#5b6573;
  --line:#e8eaed; --accent:#3b6fed; --accent-soft:#eef3ff;
}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--ink);line-height:1.7;-webkit-font-smoothing:antialiased}
.wrap{max-width:760px;margin:0 auto;padding:0 20px}
header{position:sticky;top:0;z-index:10;background:rgba(246,247,249,.86);backdrop-filter:saturate(180%) blur(8px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;gap:10px;height:58px}
.logo{width:26px;height:26px;border-radius:7px;background:var(--accent);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:14px}
.brand{font-weight:600;font-size:17px;letter-spacing:.5px}
.hero{padding:64px 0 40px;text-align:center}
.hero h1{font-size:34px;font-weight:700;letter-spacing:1px}
.hero p{margin-top:14px;color:var(--sub);font-size:16px}
.intro{padding:8px 0 36px}
.intro p{color:var(--sub);font-size:15.5px}
.section-title{font-size:15px;color:var(--sub);font-weight:600;margin:8px 0 16px;display:flex;align-items:center;gap:8px}
.section-title::before{content:"";width:4px;height:15px;background:var(--accent);border-radius:2px}
.notes{display:grid;grid-template-columns:1fr;gap:14px;margin-bottom:40px}
.note{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:18px 20px;transition:.18s;display:block;text-decoration:none;color:inherit}
.note:hover{border-color:var(--accent);box-shadow:0 6px 20px rgba(59,111,237,.08);transform:translateY(-2px)}
.note h3{font-size:16.5px;font-weight:600}
.note .meta{color:#9aa2ad;font-size:13px;margin:6px 0 8px}
.note p{color:var(--sub);font-size:14.5px}
.about{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:22px 22px;margin-bottom:48px}
.about p{color:var(--sub);font-size:15px}
footer{border-top:1px solid var(--line);padding:26px 0 40px;text-align:center;color:#9aa2ad;font-size:13.5px}
footer a{color:#9aa2ad;text-decoration:none}
/* article */
.article-wrap{max-width:760px;margin:0 auto;padding:28px 20px 10px}
.article h1{font-size:27px;font-weight:700;line-height:1.35}
.article .meta{color:#9aa2ad;font-size:13px;margin:10px 0 22px}
.article .content p{color:var(--ink);font-size:16px;margin:14px 0}
.article .content h2{font-size:19px;font-weight:600;margin:26px 0 6px}
.article .content ul{margin:10px 0 10px 22px;color:var(--sub);font-size:15.5px}
.article .content li{margin:6px 0}
.back{display:inline-block;margin:8px 0 0;color:var(--accent);text-decoration:none;font-size:14.5px}
.back:hover{text-decoration:underline}
.divider{height:1px;background:var(--line);margin:34px 0 28px}
@media(max-width:600px){.hero{padding:44px 0 28px}.hero h1{font-size:27px}.article h1{font-size:23px}}