:root{
  --ink:#13294B; --blue:#2E5FCC; --blue-bright:#3B7DE0; --blue-wash:#EEF3FB;
  --red:#E03127; --paper:#FFFFFF; --paper-2:#F6F8FB; --line:#D5DEEA;
  --ink-text:#13233B; --muted:#5A6B82;
  --sans:"Inter",ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;
}
*{box-sizing:border-box}
body{margin:0;font-family:var(--sans);color:var(--ink-text);background:var(--paper);
  -webkit-font-smoothing:antialiased;line-height:1.62;font-size:17px}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:760px;margin:0 auto;padding:0 22px}
header.nav{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.9);backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--line)}
.nav-in{display:flex;align-items:center;justify-content:space-between;height:62px;max-width:760px;margin:0 auto;padding:0 22px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:19px;letter-spacing:-.02em;color:var(--ink)}
.brand .lb{color:var(--blue)}
main{padding:44px 0 20px}
.doc h1{font-size:clamp(28px,4.5vw,40px);color:var(--ink);letter-spacing:-.02em;line-height:1.1;margin:0 0 6px}
.doc .eff{font-size:14.5px;color:var(--muted);margin:0 0 30px;padding-bottom:22px;border-bottom:1px solid var(--line)}
.doc h2{font-size:21px;color:var(--ink);letter-spacing:-.01em;margin:34px 0 10px}
.doc h3{font-size:17px;color:var(--ink);margin:24px 0 6px}
.doc p{margin:12px 0}
.doc ul{margin:12px 0;padding-left:22px}
.doc li{margin:7px 0}
.doc strong{color:var(--ink-text)}
.doc .callout{background:var(--blue-wash);border:1px solid var(--line);border-left:3px solid var(--red);border-radius:12px;padding:16px 20px;margin:20px 0}
footer{padding:40px 0;color:var(--muted);font-size:14px;border-top:1px solid var(--line);margin-top:40px}
.foot-in{display:flex;justify-content:space-between;align-items:center;gap:18px;flex-wrap:wrap;max-width:760px;margin:0 auto;padding:0 22px}
footer a{color:var(--muted)}
footer a:hover{color:var(--blue)}
@media (max-width:640px){ .foot-in{flex-direction:column;align-items:flex-start;gap:12px} }