:root{--teal:#087f83;--deep:#063f47;--ink:#172033;--muted:#64748b;--line:#dce7ea;--bg:#f4f8f8;--white:#fff}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:Inter,"Segoe UI",sans-serif}.top{position:sticky;top:0;z-index:30;height:64px;padding:0 max(18px,calc((100vw - 1240px)/2));display:flex;align-items:center;gap:14px;background:rgba(255,255,255,.92);backdrop-filter:blur(16px);border-bottom:1px solid rgba(203,219,224,.85)}.logo{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--deep);font-weight:900}.logo img{width:34px;height:34px;object-fit:contain}.top-title{flex:1;font-weight:900}.top-title small{display:block;color:var(--muted);font-size:10px}.top-link{color:var(--teal);font-size:13px;font-weight:850;text-decoration:none;padding:10px 13px;border-radius:12px;background:#eaf6f6}.shell{max-width:1240px;margin:auto;padding:24px 20px 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.lead{font-size:17px;line-height:1.55;color:#4c6173}.video{max-width:300px;margin:20px auto}.video video{width:100%;aspect-ratio:9/16;object-fit:cover;border-radius:24px;background:#10242c;box-shadow:0 18px 40px rgba(0,0,0,.16)}.bodycopy{white-space:pre-wrap;font-size:15px;line-height:1.75}.article h2{font-size:19px;margin:28px 0 10px}.steps{padding:0;list-style:none;counter-reset:steps}.steps li{counter-increment:steps;display:grid;grid-template-columns:34px 1fr;gap:11px;padding:11px 0;border-bottom:1px solid #edf1f3;font-size:14px;line-height:1.55}.steps li:before{content:counter(steps);display:grid;place-items:center;width:32px;height:32px;border-radius:11px;background:#e7f6f5;color:var(--teal);font-weight:900}.notice{padding:15px;border-radius:16px;background:#f0f8f7;border:1px solid #cce8e5;font-size:14px;line-height:1.55}.notice.warn{background:#fff8e8;border-color:#f5deb0}.cta{display:flex;gap:10px;margin:24px 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