/* blog.css — 长尾文章共享样式（与官网苹果式基调同源） */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
:root{--bg:#fff;--bg-alt:#f5f5f7;--dark:#1d1d1f;--muted:#6e6e73;--red:#c41e3a;--blue:#1a3a6b;
  --font:-apple-system,BlinkMacSystemFont,system-ui,"Noto Sans SC",sans-serif;}
body{font-family:var(--font);background:var(--bg);color:var(--dark);-webkit-font-smoothing:antialiased;}
nav{position:sticky;top:0;z-index:100;display:flex;align-items:center;justify-content:space-between;
  padding:0 6%;height:52px;background:rgba(255,255,255,.92);
  backdrop-filter:saturate(180%) blur(20px);-webkit-backdrop-filter:saturate(180%) blur(20px);
  border-bottom:1px solid rgba(0,0,0,.06);}
.nav-logo{text-decoration:none;display:flex;align-items:center;gap:8px;}
.nav-logo img{height:26px;}
.nav-logo-text{font-size:17px;font-weight:700;}
.nav-logo-text .red{color:var(--red);}
.nav-right a{color:var(--dark);text-decoration:none;font-size:14px;margin-left:18px;}
article{max-width:720px;margin:0 auto;padding:64px 20px 40px;}
.eyebrow{color:var(--red);font-size:13px;font-weight:600;text-transform:uppercase;letter-spacing:.06em;}
h1{font-size:34px;line-height:1.2;font-weight:800;margin:10px 0 8px;letter-spacing:-.01em;}
.byline{color:var(--muted);font-size:14px;margin-bottom:28px;}
h2{font-size:23px;font-weight:700;margin:36px 0 12px;letter-spacing:-.01em;}
p{font-size:17px;line-height:1.65;color:#2d2d2f;margin-bottom:14px;}
ul{margin:0 0 16px 22px;}
li{font-size:17px;line-height:1.65;margin-bottom:8px;}
.formula{background:var(--bg-alt);border-radius:12px;padding:16px 20px;font-size:18px;
  font-family:ui-monospace,SFMono-Regular,Menlo,monospace;text-align:center;margin:16px 0;}
.tbl-wrap{overflow-x:auto;margin:16px 0;}
table{border-collapse:collapse;width:100%;font-size:15px;}
th{background:var(--bg-alt);font-weight:600;text-align:left;}
th,td{padding:9px 14px;border-bottom:1px solid rgba(0,0,0,.08);}
.note{color:var(--muted);font-size:14px !important;margin-top:-6px;}
.prod-card{display:flex;gap:16px;align-items:flex-start;background:var(--bg-alt);
  border-radius:16px;padding:20px;margin-top:40px;}
.prod-card img{width:64px;height:64px;border-radius:14px;}
.prod-card h3{font-size:18px;margin-bottom:6px;}
.prod-card p{font-size:14px !important;color:var(--muted);margin-bottom:10px;}
.dl{display:inline-block;background:var(--dark);color:#fff;text-decoration:none;
  border-radius:20px;padding:8px 18px;font-size:14px;}
footer{background:var(--dark);color:rgba(255,255,255,.5);text-align:center;
  padding:22px 6%;font-size:13px;margin-top:40px;}
@media(max-width:600px){h1{font-size:26px}p,li{font-size:16px}}

.list{max-width:720px;margin:0 auto;padding:64px 20px 40px;}
.list h1{font-size:34px;font-weight:800;margin:10px 0 8px;}
.list .sub{color:var(--muted);font-size:17px;margin-bottom:28px;}
.post{display:block;text-decoration:none;color:inherit;border-bottom:1px solid rgba(0,0,0,.08);padding:22px 0;}
.post:hover h2{color:var(--red);}
.post h2{font-size:20px;font-weight:700;margin:6px 0;}
.post p{font-size:15px;color:var(--muted);}