:root{
  --bg:#ffffff; --fg:#1a1d24; --muted:#5b6472; --line:#e6e9ef;
  --brand:#2f6df6; --brand-d:#1f4bc4; --soft:#f5f7fb; --accent:#0e9f6e;
  --radius:14px; --wrap:1080px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font:16px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Inter,Arial,sans-serif;color:var(--fg);background:var(--bg)}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 20px}
.narrow{max-width:800px}
img{max-width:100%}

header.site{border-bottom:1px solid var(--line);position:sticky;top:0;background:rgba(255,255,255,.92);backdrop-filter:saturate(180%) blur(8px);z-index:10}
.nav{display:flex;align-items:center;justify-content:space-between;gap:16px;height:62px}
.brand{font-weight:700;font-size:17px;letter-spacing:.2px;white-space:nowrap}
.brand a{color:var(--fg)}
.brand a:hover{text-decoration:none}
.brand span{color:var(--brand)}
.menu{display:flex;gap:18px;flex-wrap:wrap}
.menu a{color:var(--muted);font-size:14.5px}
.menu a:hover{color:var(--fg);text-decoration:none}

.hero{padding:60px 0 40px;background:linear-gradient(180deg,var(--soft),#fff)}
.hero h1{font-size:clamp(27px,4.4vw,42px);line-height:1.15;margin:0 0 18px;letter-spacing:-.5px}
.hero .lead{font-size:clamp(17px,2.2vw,20px);color:#333b48;max-width:780px;margin:0 0 26px}
.pill{display:inline-block;background:#e8f0ff;color:var(--brand-d);font-size:13px;font-weight:600;padding:6px 12px;border-radius:999px;margin-bottom:20px}

.btn{display:inline-block;background:var(--brand);color:#fff;font-weight:600;padding:13px 22px;border-radius:10px}
.btn:hover{background:var(--brand-d);text-decoration:none}
.btn.ghost{background:#fff;color:var(--brand-d);border:1px solid #cdd8ee;margin-left:10px}

section{padding:44px 0;border-top:1px solid var(--line)}
h2{font-size:clamp(22px,3vw,30px);margin:0 0 8px;letter-spacing:-.3px}
h3{font-size:20px;margin:26px 0 8px}
.sub{color:var(--muted);margin:0 0 26px;max-width:740px}

.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:18px}
.card{border:1px solid var(--line);border-radius:var(--radius);padding:22px;background:#fff;transition:box-shadow .15s,transform .15s}
.card:hover{box-shadow:0 8px 30px rgba(20,40,90,.08);transform:translateY(-2px)}
.card h3{margin:0 0 8px;font-size:19px}
.card p{margin:0;color:#48505d;font-size:15px}
.card .k{font-size:12.5px;color:var(--accent);font-weight:600;text-transform:uppercase;letter-spacing:.5px;margin-bottom:10px}
a.card{display:block;color:inherit}
a.card:hover{text-decoration:none}
a.card .more{color:var(--brand);font-weight:600;font-size:14px;margin-top:12px;display:inline-block}

.bridge{background:var(--soft);border:1px solid var(--line);border-radius:var(--radius);padding:24px 26px;font-size:18px;line-height:1.6}
.bridge b{color:var(--brand-d)}

.crumbs{font-size:13.5px;color:var(--muted);padding:16px 0 0}
.crumbs a{color:var(--muted)}
.article{padding:20px 0 10px}
.article h1{font-size:clamp(26px,4vw,38px);line-height:1.18;letter-spacing:-.5px;margin:14px 0 16px}
.prose{font-size:16.5px;line-height:1.75}
.prose p{margin:0 0 16px}
.prose ul,.prose ol{margin:0 0 18px;padding-left:22px}
.prose li{margin:6px 0}
.prose h2{margin:34px 0 6px}
.prose h3{margin:24px 0 6px}
.prose strong{color:#232a35}
.lead-p{font-size:19px;line-height:1.6;color:#2b323d;background:var(--soft);border-left:3px solid var(--brand);border-radius:0 10px 10px 0;padding:16px 20px;margin:0 0 24px}
.tbl{width:100%;border-collapse:collapse;margin:8px 0 22px;font-size:15px;overflow-x:auto;display:block}
.tbl th,.tbl td{border:1px solid var(--line);padding:10px 12px;text-align:left;vertical-align:top}
.tbl th{background:var(--soft);font-weight:600}
.note{border:1px solid #d7e3ff;background:#f2f7ff;border-radius:10px;padding:14px 18px;margin:0 0 22px;font-size:15.5px;color:#2b3547}
.related{border:1px solid var(--line);border-radius:var(--radius);padding:20px 22px;background:#fff;margin:26px 0}
.related h3{margin:0 0 10px;font-size:16px}
.related ul{margin:0;padding-left:20px}

.cta{background:linear-gradient(135deg,#1f4bc4,#2f6df6);color:#fff;border-radius:18px;padding:36px 30px;text-align:center;margin:30px 0}
.cta h2{color:#fff;margin-bottom:8px}
.cta p{color:#dce6ff;max-width:640px;margin:0 auto 22px}
.cta .btn{background:#fff;color:var(--brand-d)}
.cta .btn:hover{background:#eef3ff}

.faq details{border:1px solid var(--line);border-radius:12px;padding:6px 18px;margin-bottom:12px;background:#fff}
.faq summary{cursor:pointer;font-weight:600;padding:12px 0;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";float:right;color:var(--brand);font-weight:700}
.faq details[open] summary::after{content:"–"}
.faq p{margin:0 0 14px;color:#48505d}

footer{border-top:1px solid var(--line);padding:34px 0;color:var(--muted);font-size:14px;background:var(--soft)}
footer .row{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}
footer a{color:var(--muted)}
footer .fmenu{display:flex;gap:16px;flex-wrap:wrap;margin-top:6px}