:root{
  --ink:#111418;
  --muted:#5b6472;
  --line:#e3e7ee;
  --bg:#ffffff;
  --soft:#f6f8fb;
  --brand:#1f5eff;
  --block:#d92d20;
  --warn:#b54708;
  --pass:#067647;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  font:16px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif;
  color:var(--ink);
  background:var(--bg);
}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:860px;margin:0 auto;padding:0 20px}
header.nav{border-bottom:1px solid var(--line);background:#fff;position:sticky;top:0;z-index:9}
.nav-in{display:flex;align-items:center;gap:20px;height:60px}
.logo{font-weight:700;letter-spacing:-.02em}
.nav a{color:var(--muted);font-size:14px}
.nav a:hover{color:var(--ink)}
.spacer{flex:1}
.btn{
  display:inline-block;padding:11px 18px;border-radius:8px;font-weight:600;font-size:15px;
  background:var(--brand);color:#fff;border:1px solid var(--brand);cursor:pointer;
}
.btn:hover{opacity:.92;text-decoration:none}
.btn.ghost{background:#fff;color:var(--ink);border-color:var(--line)}
.hero{padding:64px 0 40px;border-bottom:1px solid var(--line)}
.hero h1{font-size:44px;line-height:1.15;letter-spacing:-.03em;margin:0 0 16px}
.hero p.sub{font-size:19px;color:var(--muted);margin:0 0 28px;max-width:680px}
.trust{font-size:13px;color:var(--muted);margin-top:14px}
section{padding:44px 0;border-bottom:1px solid var(--line)}
h2{font-size:24px;letter-spacing:-.02em;margin:0 0 18px}
h3{font-size:17px;margin:0 0 6px}
p{color:var(--muted)}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.card{border:1px solid var(--line);border-radius:12px;padding:18px;background:#fff}
.card .n{font-size:12px;font-weight:700;color:var(--brand);letter-spacing:.08em;text-transform:uppercase}
table{width:100%;border-collapse:collapse;font-size:15px}
th,td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--line);vertical-align:top}
th{font-size:13px;color:var(--muted);font-weight:600}
code{background:var(--soft);padding:2px 6px;border-radius:4px;font-size:13px}
pre{background:var(--soft);padding:14px;border-radius:10px;overflow:auto;font-size:13px}
details{border:1px solid var(--line);border-radius:10px;padding:12px 14px;margin-bottom:10px}
summary{cursor:pointer;font-weight:600}
footer{padding:36px 0 60px;color:var(--muted);font-size:13px}
.field{margin-bottom:14px}
label{display:block;font-size:13px;font-weight:600;margin-bottom:6px}
input[type=text],textarea,select{
  width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:8px;
  font:inherit;font-size:14px;color:var(--ink);background:#fff;
}
textarea{min-height:110px;resize:vertical}
.row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.counter{font-size:12px;color:var(--muted);text-align:right;margin-top:4px}
#result{margin-top:22px}
.score{display:flex;align-items:baseline;gap:10px;margin-bottom:14px}
.score b{font-size:38px;letter-spacing:-.03em}
.finding{border-left:3px solid var(--line);padding:10px 14px;margin-bottom:8px;background:var(--soft);border-radius:0 8px 8px 0}
.finding.block{border-left-color:var(--block)}
.finding.warn{border-left-color:var(--warn)}
.finding.pass{border-left-color:var(--pass)}
.finding .tag{font-size:11px;font-weight:700;letter-spacing:.06em;text-transform:uppercase}
.finding.block .tag{color:var(--block)}
.finding.warn .tag{color:var(--warn)}
.finding.pass .tag{color:var(--pass)}
.finding p{margin:2px 0 0;font-size:14px}
.note{background:#fffaeb;border:1px solid #fedf89;border-radius:10px;padding:14px 16px;font-size:14px;color:#7a2e0e}
@media (max-width:720px){
  .hero h1{font-size:32px}
  .grid,.row{grid-template-columns:1fr}
  .nav a{display:none}
}