:root{--brand:#1652f0;--brand6:#0c4fe4;--ink:#0e0f11;--muted:#707684;--subtle:#9aa0ab;--line:#e8e9ec;--canvas:#fbfbfc}
*{box-sizing:border-box}body{margin:0;font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;color:var(--ink);background:var(--canvas);line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:var(--brand);text-decoration:none}a:hover{text-decoration:underline}
.wrap{max-width:720px;margin:0 auto;padding:0 20px}
header.site{border-bottom:1px solid var(--line);background:#fff}header.site .wrap{display:flex;align-items:center;height:56px;max-width:1080px}
.logo{font-weight:800;font-size:17px;letter-spacing:-.02em;color:var(--ink)}.logo span{color:var(--brand)}
h1.post{font-size:32px;line-height:1.15;font-weight:800;letter-spacing:-.02em;margin:24px 0 8px}
.meta{color:var(--subtle);font-size:13px;margin-bottom:22px}
article h2{font-size:23px;font-weight:800;margin:34px 0 12px;line-height:1.2}article h3{font-size:18px;font-weight:700;margin:26px 0 8px}
article p{margin:16px 0;font-size:16px;color:#26282c}article ul,article ol{margin:16px 0;padding-left:22px}article li{margin:6px 0;font-size:16px;color:#26282c}
article strong{color:var(--ink)}blockquote{border-left:3px solid rgba(22,82,240,.4);margin:18px 0;padding:4px 0 4px 16px;color:var(--muted);font-style:italic}
code{background:#f1f2f4;border-radius:5px;padding:2px 6px;font-size:14px}
.cta{margin:32px 0;padding:26px;border:1px solid rgba(22,82,240,.2);background:rgba(22,82,240,.05);border-radius:18px;text-align:center}
.cta .h{font-size:19px;font-weight:800}.cta p{color:var(--muted);font-size:14px;margin:6px 0 16px}
.btn{display:inline-block;background:var(--brand);color:#fff;font-weight:700;font-size:16px;padding:14px 28px;border-radius:12px;border:0;cursor:pointer;box-shadow:0 6px 16px rgba(22,82,240,.25)}
.btn:hover{background:var(--brand6);text-decoration:none}.btn:disabled{opacity:.6}
.trust{font-size:12px;color:var(--subtle);margin-top:8px}
.faq{margin-top:36px;border-top:1px solid var(--line);padding-top:24px}.faq h2{font-size:22px}.faq .q{font-weight:700;margin-top:18px}.faq .a{color:var(--muted);font-size:15px;margin-top:4px}
.related{margin-top:36px;border-top:1px solid var(--line);padding-top:24px}.related a{display:block;font-weight:700;margin:10px 0}
footer.site{border-top:1px solid var(--line);margin-top:48px;padding:24px 0;color:var(--subtle);font-size:13px}
.idx-hero{padding:40px 0 8px}.idx-hero h1{font-size:34px;font-weight:800;letter-spacing:-.02em;margin:0 0 10px}.idx-hero p{color:var(--muted);font-size:17px;max-width:560px}
.cluster{margin-top:36px}.cluster h2{font-size:13px;text-transform:uppercase;letter-spacing:.06em;color:var(--subtle);margin-bottom:12px}
.card{display:block;border:1px solid var(--line);background:#fff;border-radius:12px;padding:18px;margin:10px 0}.card:hover{box-shadow:0 4px 16px rgba(0,0,0,.06);text-decoration:none}
.card .t{font-weight:800;font-size:16px;color:var(--ink)}.card .e{color:var(--muted);font-size:14px;margin-top:6px}
.sticky{position:fixed;left:0;right:0;bottom:0;background:rgba(255,255,255,.96);border-top:1px solid var(--line);padding:12px 16px;backdrop-filter:blur(8px);display:none}
@media(max-width:640px){.sticky{display:block}.sticky .btn{width:100%;display:block;text-align:center}h1.post{font-size:27px}}