:root{--brand:#1A5FD8;--ink:#14171f;--muted:#5b6170;--line:#e3e6ee;--soft:#f3f6fd;--bg:#ffffff}
*{box-sizing:border-box}
body{margin:0;font-family:Inter,system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;color:var(--ink);background:var(--bg);
line-height:1.6;font-size:17px}
a{color:var(--brand)}
.top{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:14px 20px;border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:20px;color:var(--ink);text-decoration:none}
.mark{display:inline-grid;place-items:center;width:32px;height:32px;border-radius:10px;background:var(--brand)}
.top nav{display:flex;align-items:center;gap:16px;font-weight:600}
.top nav a{text-decoration:none}
main{max-width:760px;margin:0 auto;padding:24px 20px 48px}
h1{font-size:clamp(28px,5vw,40px);line-height:1.15;margin:16px 0 4px}
h2{font-size:24px;margin:36px 0 10px}
h3{font-size:19px;margin:24px 0 8px}
.updated{color:var(--muted);font-size:14px;margin:0 0 20px}
.answer{background:var(--soft);border-left:4px solid var(--brand);padding:16px 18px;border-radius:8px}
table{width:100%;border-collapse:collapse;margin:8px 0 12px;font-size:16px}
th,td{text-align:left;padding:9px 10px;border-bottom:1px solid var(--line)}
th{background:var(--soft);font-weight:700}
.cta{display:flex;gap:18px;align-items:center;justify-content:space-between;background:var(--brand);color:#fff;
padding:22px;border-radius:16px;margin:32px 0}
.cta p{margin:6px 0 0;opacity:.92;font-size:15px}
.cta strong{font-size:19px}
.button{display:inline-block;background:var(--brand);color:#fff;text-decoration:none;font-weight:700;padding:13px 20px;
border-radius:12px;white-space:nowrap}
.cta .button{background:#fff;color:var(--brand)}
.button.small{padding:8px 14px;font-size:15px}
details{border:1px solid var(--line);border-radius:10px;padding:12px 16px;margin:8px 0}
summary{font-weight:700;cursor:pointer}
details p{margin:10px 0 0}
.source{color:var(--muted);font-size:14px;margin-top:28px}
.related{border-top:1px solid var(--line);margin-top:40px;padding-top:8px}
.guide-list{list-style:none;padding:0}
.guide-list li{margin:12px 0}
.guide-list a{display:block;border:1px solid var(--line);border-radius:12px;padding:16px 18px;text-decoration:none;color:var(--ink)}
.guide-list a:hover{border-color:var(--brand)}
.guide-list span{display:block;color:var(--muted);font-size:15px;margin-top:4px}
footer{border-top:1px solid var(--line);color:var(--muted);font-size:14px;text-align:center;padding:20px}
@media (max-width:600px){.cta{flex-direction:column;align-items:stretch;text-align:left}.top nav a:first-child{display:none}
table{font-size:14px}th,td{padding:7px 6px}}