:root{--ink:#0b1728;--muted:#617086;--blue:#2167f2;--cyan:#23d5c5;--navy:#07111f;--line:#e1e7ef}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:#f6f8fb;color:var(--ink);font-family:Inter,"PingFang SC","Microsoft YaHei",system-ui,sans-serif;line-height:1.85}a{color:inherit;text-decoration:none}.wrap{width:min(1120px,calc(100% - 36px));margin:auto}.topbar{height:70px;background:rgba(7,17,31,.96);color:#fff;display:flex;align-items:center;position:sticky;top:0;z-index:10}.nav{display:flex;justify-content:space-between;align-items:center}.brand{display:flex;align-items:center;gap:10px;font-weight:800}.mark{display:grid;place-items:center;width:34px;height:34px;border-radius:11px;background:linear-gradient(135deg,var(--cyan),var(--blue))}.navlinks{display:flex;gap:25px;font-size:13px;color:#b8c4d4}.hero{background:var(--navy);color:#fff;padding:78px 0 70px}.crumbs{font-size:12px;color:#8191a8;margin-bottom:25px}.crumbs a{color:#a9b8cb}.tag{color:var(--cyan);font-size:12px;font-weight:800;letter-spacing:.12em}.hero h1{font-size:clamp(36px,5vw,58px);max-width:900px;line-height:1.18;letter-spacing:-.035em;margin:13px 0 22px}.lead{max-width:790px;color:#b2c0d2;font-size:18px}.meta{display:flex;gap:20px;color:#71839b;font-size:12px;margin-top:25px}.layout{display:grid;grid-template-columns:minmax(0,760px) 280px;gap:54px;align-items:start;padding:65px 0 90px}.content{background:#fff;border:1px solid var(--line);border-radius:20px;padding:48px 54px;box-shadow:0 18px 50px rgba(14,32,60,.06)}.answer{background:#edf5ff;border-left:4px solid var(--blue);border-radius:0 12px 12px 0;padding:20px 24px;margin:0 0 38px}.answer strong{display:block;color:var(--blue);margin-bottom:5px}.content h2{font-size:29px;line-height:1.35;margin:48px 0 16px;scroll-margin-top:95px}.content h3{font-size:20px;margin:30px 0 10px}.content p{color:#34445a;margin:0 0 18px}.content ul,.content ol{color:#34445a;padding-left:24px}.content li{margin:9px 0}.note{background:#f7f9fc;border:1px solid var(--line);border-radius:12px;padding:18px 20px;margin:25px 0}.toc,.side-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:24px;position:sticky;top:95px}.toc h2,.side-card h2{font-size:16px;margin:0 0 15px}.toc ol{padding-left:20px;margin:0;color:#58687d;font-size:13px}.toc li{margin:9px 0}.side-cta{display:block;background:linear-gradient(135deg,#2873ff,#1554ce);color:#fff;text-align:center;padding:12px;border-radius:10px;font-weight:750;margin-top:18px}.faq h3{font-size:18px}.related{background:#eef3f9;padding:70px 0}.related h2{text-align:center;font-size:34px}.related-grid,.hub-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.related-card,.hub-card{background:#fff;border:1px solid var(--line);border-radius:15px;padding:24px}.related-card span,.hub-card span{font-size:11px;color:var(--blue);font-weight:800}.related-card h3,.hub-card h2{font-size:18px;line-height:1.5;margin:9px 0}.related-card a,.hub-card a{color:var(--blue);font-size:13px;font-weight:700}.hub-hero{text-align:center}.hub-hero .lead{margin:auto}.hub{padding:70px 0}.hub-card{min-height:230px;display:flex;flex-direction:column}.hub-card p{color:var(--muted);font-size:14px}.hub-card a{margin-top:auto}.footer{background:#050c16;color:#78879a;padding:35px 0;font-size:12px}.footer .wrap{display:flex;justify-content:space-between}.legal{font-size:12px;color:#738298;border-top:1px solid var(--line);padding-top:25px;margin-top:45px}@media(max-width:850px){.layout{grid-template-columns:1fr}.toc{position:static}.content{padding:35px 30px}.related-grid,.hub-grid{grid-template-columns:1fr 1fr}.navlinks{display:none}}@media(max-width:560px){.hero{padding:55px 0}.hero h1{font-size:36px}.lead{font-size:16px}.layout{padding-top:30px}.content{padding:28px 20px}.content h2{font-size:25px}.related-grid,.hub-grid{grid-template-columns:1fr}.meta{flex-wrap:wrap}.footer .wrap{flex-direction:column;gap:8px}}