*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:#fff;color:#1a1f2e;
  font:16px/1.75 -apple-system,BlinkMacSystemFont,"Segoe UI","Hiragino Sans GB","PingFang SC","Microsoft YaHei",sans-serif;
  -webkit-font-smoothing:antialiased}
a{color:#1a56db;text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:860px;margin:0 auto;padding:0 24px}

header.top{border-bottom:1px solid #eceef1;background:#fff;position:sticky;top:0;z-index:10}
header.top .wrap{display:flex;align-items:center;gap:20px;height:60px}
header.top .brand{font-weight:600;font-size:15px;letter-spacing:.02em;color:#1a1f2e}
header.top nav{margin-left:auto;display:flex;gap:18px;font-size:14px}
header.top nav a{color:#5b6472}
header.top nav a:hover{color:#1a56db}

.hero{padding:64px 0 44px;border-bottom:1px solid #eceef1}
.hero h1{font-size:clamp(26px,4vw,38px);line-height:1.32;margin:0 0 18px;letter-spacing:-.01em;font-weight:700}
.hero p.lede{font-size:17px;color:#495362;margin:0;max-width:70ch}
.hero .eyebrow{display:inline-block;font-size:13px;letter-spacing:.08em;color:#8a93a0;
  text-transform:uppercase;margin-bottom:18px}

section{padding:44px 0;border-bottom:1px solid #eceef1}
section:last-of-type{border-bottom:0}
h2{font-size:20px;margin:0 0 20px;letter-spacing:-.01em;font-weight:650}
h3{font-size:15px;margin:0 0 6px;font-weight:650}

ul.pain{margin:0;padding-left:0;list-style:none}
ul.pain li{position:relative;padding-left:22px;margin-bottom:12px;color:#495362}
ul.pain li::before{content:"";position:absolute;left:4px;top:11px;width:5px;height:5px;
  border-radius:50%;background:#c9403a}

ol.how{margin:0;padding-left:0;list-style:none;counter-reset:h}
ol.how li{counter-increment:h;position:relative;padding-left:40px;margin-bottom:22px}
ol.how li::before{content:counter(h);position:absolute;left:0;top:1px;width:26px;height:26px;
  border-radius:8px;background:#f4f5f7;color:#5b6472;font-size:13px;font-weight:600;
  display:flex;align-items:center;justify-content:center}
ol.how p{margin:0;color:#495362}

pre{background:#f7f8fa;border:1px solid #eceef1;border-radius:10px;padding:18px 20px;
  overflow-x:auto;margin:0;font-size:13.5px;line-height:1.65}
code{font-family:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,monospace}
p code,li code,td code{background:#f4f5f7;padding:2px 6px;border-radius:5px;font-size:13px}

table{width:100%;border-collapse:collapse;font-size:14.5px}
th,td{text-align:left;padding:11px 14px;border-bottom:1px solid #eceef1;vertical-align:top}
th{font-weight:600;color:#5b6472;font-size:13px;letter-spacing:.03em;text-transform:uppercase}
td:first-child{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13.5px;white-space:nowrap}
td:nth-child(2){color:#8a93a0;white-space:nowrap}

.callout{background:#fbfbfc;border:1px solid #eceef1;border-left:3px solid var(--accent,#1a56db);
  border-radius:0 8px 8px 0;padding:16px 20px;font-size:14.5px;color:#495362;margin-top:24px}

.btnrow{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.btn{display:inline-block;padding:11px 20px;border-radius:8px;font-size:14.5px;font-weight:500;
  border:1px solid #d8dce3;color:#1a1f2e;background:#fff}
.btn:hover{text-decoration:none;border-color:#1a56db;color:#1a56db}
.btn.primary{background:#1a1f2e;border-color:#1a1f2e;color:#fff}
.btn.primary:hover{background:#2b3244;color:#fff;border-color:#2b3244}

.cards{display:grid;gap:16px}
.card{display:block;border:1px solid #eceef1;border-radius:12px;padding:24px 26px;
  transition:border-color .15s,box-shadow .15s}
.card:hover{border-color:#d8dce3;box-shadow:0 2px 12px rgba(20,30,50,.05);text-decoration:none}
.card .t{font-size:16.5px;font-weight:650;color:#1a1f2e;margin-bottom:4px}
.card .s{font-size:14px;color:#8a93a0;margin-bottom:12px}
.card .d{font-size:14.5px;color:#495362;margin:0}
.card .tags{margin-top:14px;display:flex;flex-wrap:wrap;gap:8px}
.card .tags span{font-size:12.5px;color:#5b6472;background:#f4f5f7;padding:3px 10px;border-radius:999px}

footer{padding:40px 0 56px;font-size:13.5px;color:#8a93a0}
footer a{color:#5b6472}

.backlink{font-size:14px;display:inline-block;margin-bottom:26px;color:#8a93a0}
@media(max-width:640px){
  .hero{padding:40px 0 32px}
  section{padding:34px 0}
  header.top nav{display:none}
  th,td{padding:9px 10px}
}

.bc{font-size:14px;color:#8a93a0;padding-top:28px}
.bc a{color:#8a93a0}
.bc span{margin:0 8px}
.bc b{color:#1a1f2e;font-weight:600}
.aliases{display:flex;flex-wrap:wrap;gap:8px}
.aliases .al{font-size:13px;color:#5b6472;background:#f4f5f7;padding:5px 12px;border-radius:999px}
.faq details{border-bottom:1px solid #eceef1;padding:14px 0}
.faq details:last-child{border-bottom:0}
.faq summary{cursor:pointer;font-weight:600;font-size:15.5px;color:#1a1f2e;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::before{content:"›";display:inline-block;margin-right:10px;color:#8a93a0;
  transition:transform .15s;transform:rotate(0deg)}
.faq details[open] summary::before{transform:rotate(90deg)}
.faq p{margin:12px 0 0 22px;color:#495362;font-size:14.5px}