:root{
  --bg:#ffffff; --fg:#111827; --muted:#5b6472; --line:#e5e7eb;
  --brand:#0057b8; --brand2:#0f172a; --soft:#f6f8fb;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:Inter,Segoe UI,Roboto,Arial,sans-serif;color:var(--fg);background:var(--bg);line-height:1.62;font-size:17px}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
.site-header{position:sticky;top:0;background:rgba(255,255,255,.94);backdrop-filter:blur(10px);border-bottom:1px solid var(--line);z-index:10}
.header-inner{max-width:1180px;margin:auto;display:flex;align-items:center;justify-content:space-between;gap:24px;padding:14px 22px}
.logo{display:flex;align-items:center;gap:12px;font-weight:800;font-size:20px;color:var(--brand2)}
.logo img{height:42px;max-width:190px;object-fit:contain}
.nav{display:flex;gap:18px;align-items:center;flex-wrap:wrap;font-size:14px}
.nav a{color:#1f2937;font-weight:600}
.hero{background:linear-gradient(135deg,#f7faff 0%,#eef4ff 55%,#fff 100%);border-bottom:1px solid var(--line)}
.hero-inner{max-width:1180px;margin:auto;padding:58px 22px 46px}
.hero h1{font-size:clamp(34px,5vw,62px);line-height:1.05;margin:0 0 16px;color:#0b1220;letter-spacing:-.04em}
.hero p{max-width:760px;font-size:20px;color:var(--muted);margin:0}
main{max-width:1040px;margin:0 auto;padding:42px 22px 64px}
.content h1,.content h2,.content h3,.content h4{line-height:1.18;color:#0b1220;letter-spacing:-.02em;margin-top:1.55em;margin-bottom:.55em}
.content h2{font-size:clamp(28px,3vw,42px)}
.content h3{font-size:26px}
.content h4{font-size:21px}
.content p{margin:0 0 1em}
.content ul,.content ol{padding-left:1.35em;margin:0 0 1.1em}
.content li{margin:.32em 0}
.content img{max-width:100%;height:auto;border-radius:18px;box-shadow:0 10px 30px rgba(15,23,42,.08);margin:18px 0}
.content figure{margin:24px 0}
.content figcaption{font-size:14px;color:var(--muted);text-align:center}
.content table{border-collapse:collapse;width:100%;overflow:auto}
.content td,.content th{border:1px solid var(--line);padding:10px;text-align:left}
.content blockquote{border-left:4px solid var(--brand);padding-left:18px;color:var(--muted);margin:24px 0}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:18px;margin:28px 0}
.card{border:1px solid var(--line);border-radius:20px;background:#fff;padding:22px;box-shadow:0 10px 25px rgba(15,23,42,.05)}
.site-footer{border-top:1px solid var(--line);background:#0f172a;color:#d1d5db}
.footer-inner{max-width:1180px;margin:auto;padding:30px 22px;display:flex;justify-content:space-between;gap:18px;flex-wrap:wrap;font-size:14px}
.site-footer a{color:#fff}
.notice{background:#fff7ed;border:1px solid #fed7aa;color:#7c2d12;border-radius:14px;padding:14px 16px;margin:20px 0;font-size:15px}
svg{width:24px;height:24px;vertical-align:middle;fill:currentColor}
@media(max-width:760px){
  .header-inner{align-items:flex-start;flex-direction:column}
  .nav{gap:12px}
  main{padding-top:28px}
}