:root{--ink:#11162f;--dim:#5b5f7b;--faint:#8b8fa8;--line:#e9e9f0;--brand:#4f47fd;--brand2:#8f5ffd}
*{box-sizing:border-box}
body{margin:0;background:#fff;color:var(--ink);
 font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
 font-size:17px;line-height:1.85;-webkit-font-smoothing:antialiased}
a{color:var(--brand);text-decoration:none}
.wrap{max-width:900px;margin:0 auto;padding:0 22px}
nav.top{display:flex;justify-content:space-between;align-items:center;
 max-width:900px;margin:0 auto;padding:18px 22px;font-size:15px}
nav.top .logo{font-weight:900;letter-spacing:.5px;color:var(--ink);font-size:17px}
nav.top .logo i{font-style:normal;background:linear-gradient(90deg,#4f47fd,#8f5ffd 55%,#c187fc);
 -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
nav.top a{color:var(--dim);margin-left:18px}
nav.top a:hover{color:var(--ink)}
header.hero{padding:26px 0 6px}
.crumb{font-size:13.5px;color:var(--faint);margin-bottom:14px}
.crumb a{color:var(--faint)}
h1{font-size:34px;line-height:1.35;font-weight:900;margin:0 0 10px}
.sub{color:var(--dim);font-size:17px;margin:0 0 18px}
.lede{background:#f7f7fd;border-left:4px solid var(--brand);border-radius:10px;
 padding:16px 20px;font-size:17px;color:#2a2d46;margin:0 0 22px}
.lede b{color:var(--ink)}
.params{display:flex;flex-wrap:wrap;gap:10px;margin:0 0 26px;padding:0;list-style:none}
.params li{background:#fff;border:1px solid var(--line);border-radius:999px;
 padding:6px 15px;font-size:14px;color:var(--dim)}
.params li b{color:var(--ink);font-weight:700}
h2{font-size:22px;font-weight:800;margin:34px 0 12px;padding-left:11px;border-left:4px solid var(--brand)}
h3{font-size:17.5px;font-weight:700;margin:20px 0 8px}
p{margin:0 0 12px}
.grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:14px 0}
.grid img{width:100%;height:auto;border-radius:12px;border:1px solid var(--line);display:block}
video{width:100%;max-height:520px;border-radius:12px;border:1px solid var(--line);background:#000}
pre{background:#f6f7fb;border:1px solid var(--line);border-radius:12px;padding:16px 18px;
 white-space:pre-wrap;word-break:break-word;font-size:14.5px;line-height:1.8;
 font-family:"SF Mono",Menlo,Consolas,monospace;color:#232640;margin:10px 0 18px}
ol.howto{padding-left:0;list-style:none;counter-reset:s;margin:12px 0}
ol.howto li{counter-increment:s;position:relative;padding:0 0 16px 46px;border-bottom:1px dashed var(--line);margin-bottom:14px}
ol.howto li:last-child{border-bottom:0}
ol.howto li::before{content:counter(s);position:absolute;left:0;top:3px;width:30px;height:30px;
 border-radius:50%;background:linear-gradient(135deg,#4f47fd,#8f5ffd);color:#fff;
 font-size:15px;font-weight:800;display:flex;align-items:center;justify-content:center}
ol.howto li b{display:block;font-size:17px;margin-bottom:3px}
ul.tips{padding-left:0;list-style:none;margin:12px 0}
ul.tips li{position:relative;padding-left:22px;margin-bottom:9px;color:#33364f}
ul.tips li::before{content:"✓";position:absolute;left:0;color:var(--brand);font-weight:800}
.cta{margin:34px 0 40px;padding:20px 22px;border:1px solid var(--line);border-radius:14px;background:#fbfbff}
.cta a{font-weight:700}
footer{border-top:1px solid var(--line);margin-top:38px;padding:22px 0 40px;
 font-size:13.5px;color:var(--faint);line-height:1.9}
footer a{color:var(--faint)}
/* 索引页 */
.cards{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin:26px 0 10px}
.card{border:1px solid var(--line);border-radius:14px;overflow:hidden;background:#fff;display:block;color:inherit}
.card:hover{border-color:#c9c6f8}
.card img{width:100%;height:170px;object-fit:cover;display:block;background:#f3f3f8}
.card .bd{padding:14px 16px 16px}
.card .tag{display:inline-block;font-size:12.5px;color:var(--brand);background:#f2f1ff;
 border-radius:999px;padding:3px 11px;margin-bottom:8px}
.card h3{margin:0 0 6px;font-size:16.5px;font-weight:800;line-height:1.45}
.card p{margin:0;font-size:13.5px;color:var(--dim);line-height:1.7}
@media(max-width:640px){
 .cards{grid-template-columns:1fr}.grid{grid-template-columns:1fr}
 h1{font-size:26px}body{font-size:16px}
}