:root{--ink:#0f172a;--muted:#526174;--line:#d9e2ec;--blue:#2457d6;--blue-dark:#173da7;--soft:#f4f7fb;--warn:#fff8e7;--green:#eaf8f0}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;color:var(--ink);background:#fff;line-height:1.65}a{color:var(--blue)}a:hover{color:var(--blue-dark)}.site-header{border-bottom:1px solid var(--line);background:#fff;position:sticky;top:0;z-index:5}.header-inner{max-width:1080px;margin:auto;padding:14px 22px;display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{font-size:21px;font-weight:800;text-decoration:none;color:var(--ink)}.nav{display:flex;gap:17px;align-items:center;flex-wrap:wrap}.nav a{font-size:14px;font-weight:650;text-decoration:none;color:#344256}.nav .open-app{color:#fff;background:var(--blue);padding:8px 13px;border-radius:9px}.hero{background:linear-gradient(145deg,#eef4ff 0%,#fff 58%,#f6fbf8 100%);border-bottom:1px solid var(--line)}.hero-inner{max-width:900px;margin:auto;padding:72px 24px 58px}.eyebrow{color:var(--blue);font-weight:800;font-size:12px;letter-spacing:.12em}.hero h1{font-size:clamp(35px,6vw,60px);line-height:1.04;letter-spacing:-.04em;max-width:850px;margin:12px 0 20px}.hero p{font-size:19px;color:var(--muted);max-width:760px;margin:0}.updated{margin-top:18px!important;font-size:13px!important}.layout{max-width:1080px;margin:0 auto;padding:42px 24px 80px;display:grid;grid-template-columns:minmax(0,720px) 250px;gap:54px}.article h2{font-size:29px;line-height:1.2;letter-spacing:-.02em;margin:48px 0 14px}.article h3{font-size:21px;line-height:1.3;margin:30px 0 8px}.article p,.article li{font-size:17px;color:#27364a}.article li{margin-bottom:9px}.article ul,.article ol{padding-left:24px}.quick-answer{font-size:18px!important;background:var(--green);border:1px solid #c7ead5;border-radius:15px;padding:20px 22px;color:#163d29!important}.warning{background:var(--warn);border-left:5px solid #e4aa25;padding:17px 19px;border-radius:0 12px 12px 0}.checklist{list-style:none;padding:0!important}.checklist li{padding:13px 15px 13px 42px;border:1px solid var(--line);border-radius:11px;margin:9px 0;position:relative}.checklist li:before{content:"✓";position:absolute;left:15px;color:#168052;font-weight:800}.steps{counter-reset:step;list-style:none;padding:0!important}.steps li{counter-increment:step;position:relative;padding:0 0 24px 54px}.steps li:before{content:counter(step);position:absolute;left:0;top:0;width:36px;height:36px;border-radius:50%;display:grid;place-items:center;background:var(--blue);color:#fff;font-weight:800}.cta{margin:48px 0 10px;background:#10244b;color:#fff;padding:28px;border-radius:18px}.cta h2{color:#fff;margin:0 0 9px;font-size:27px}.cta p{color:#d9e6ff;margin:0 0 18px}.cta a{display:inline-block;background:#fff;color:#173da7;text-decoration:none;font-weight:800;padding:11px 16px;border-radius:10px}.toc{position:sticky;top:86px;align-self:start;border:1px solid var(--line);border-radius:14px;padding:18px;background:var(--soft)}.toc strong{display:block;margin-bottom:9px}.toc a{display:block;color:#445268;text-decoration:none;font-size:14px;padding:5px 0}.related{border-top:1px solid var(--line);margin-top:45px;padding-top:26px}.related-grid,.guide-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.card{border:1px solid var(--line);border-radius:15px;padding:20px;text-decoration:none;color:inherit;background:#fff}.card:hover{border-color:#9eb7f2;box-shadow:0 8px 24px rgba(31,61,115,.08)}.card span{font-size:12px;color:var(--blue);font-weight:800;letter-spacing:.08em}.card h2,.card h3{font-size:20px;margin:8px 0}.card p{font-size:15px;color:var(--muted);margin:0}.hub{max-width:1080px;margin:auto;padding:50px 24px 90px}.hub-intro{max-width:760px;font-size:18px;color:var(--muted);margin-bottom:32px}.site-footer{border-top:1px solid var(--line);background:var(--soft)}.footer-inner{max-width:1080px;margin:auto;padding:28px 24px;display:flex;justify-content:space-between;gap:22px;flex-wrap:wrap;font-size:14px;color:var(--muted)}.footer-inner nav{display:flex;gap:15px;flex-wrap:wrap}.footer-inner a{color:#41516a}.source-note{font-size:14px!important;color:var(--muted)!important;border-top:1px solid var(--line);padding-top:18px;margin-top:38px}@media(max-width:820px){.site-header{position:static}.header-inner{align-items:flex-start}.nav{justify-content:flex-end}.nav a:not(.open-app){display:none}.hero-inner{padding:48px 20px 42px}.layout{display:block;padding:32px 20px 65px}.toc{position:static;margin-bottom:28px}.related-grid,.guide-grid{grid-template-columns:1fr}.article h2{font-size:26px}.article p,.article li{font-size:16px}.hub{padding:38px 20px 65px}}