:root{--ink:#16171a;--muted:#666a73;--line:#e2e3e7;--paper:#f5f5f7;--blue:#1677ff}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Inter,Arial,sans-serif;letter-spacing:-.018em}.preview{background:#111216;color:#fff;text-align:center;padding:10px 16px;font-size:12px;letter-spacing:.04em}.top{background:rgba(255,255,255,.86);backdrop-filter:blur(20px);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5}.nav{max-width:1140px;margin:auto;min-height:70px;padding:10px 24px;display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{display:inline-flex;gap:10px;align-items:center;font-weight:700;font-size:14px;letter-spacing:-.04em;text-decoration:none;color:inherit}.brand img{width:34px;height:34px;border-radius:50%}.navlinks{display:flex;align-items:center;gap:20px;flex-wrap:wrap}.navlinks a{font-size:12px;color:#555;text-decoration:none}.navright{display:flex;align-items:center;gap:12px}.lang{display:flex;gap:2px}.lang button{background:transparent;border:0;padding:8px;color:#777;cursor:pointer;font-weight:600}.lang button.active{color:#111}.back{font-size:12px;text-decoration:none;color:#555}.wrap{width:min(900px,calc(100% - 40px));margin:auto}.intro{padding:76px 0 42px}.eyebrow{font-size:11px;text-transform:uppercase;letter-spacing:.16em;color:#777;font-weight:700}.intro h1{font-size:clamp(42px,8vw,78px);line-height:.98;letter-spacing:-.075em;margin:18px 0 20px;max-width:790px}.lead{font-size:19px;line-height:1.55;color:#595c64;max-width:720px}.updated{color:#858891;font-size:12px;margin-top:22px}.layout{display:grid;grid-template-columns:205px minmax(0,1fr);gap:42px;padding-bottom:90px}.toc{position:sticky;top:92px;align-self:start;background:#fff;border:1px solid var(--line);border-radius:18px;padding:20px}.toc strong{display:block;font-size:12px;margin-bottom:12px}.toc a{display:block;padding:8px 0;color:#686b72;text-decoration:none;font-size:12px;line-height:1.35}.toc a:hover{color:#1677ff}.content{background:#fff;border:1px solid var(--line);border-radius:22px;padding:clamp(24px,5vw,54px)}.content h2{font-size:24px;letter-spacing:-.045em;margin:34px 0 12px}.content h2:first-child{margin-top:0}.content h3{font-size:16px;margin:24px 0 8px}.content p,.content li{font-size:15px;line-height:1.72;color:#4e5159}.content ul,.content ol{padding-left:22px}.content a{color:#176bd1;text-decoration:underline;text-underline-offset:3px}.callout{background:#f5f6f8;border:1px solid var(--line);border-radius:14px;padding:18px 20px;font-size:13px;line-height:1.65;color:#50535a;margin:24px 0}.links{display:flex;gap:10px;flex-wrap:wrap;margin:28px 0}.links a,.button{display:inline-flex;align-items:center;justify-content:center;border-radius:999px;padding:12px 17px;background:#16171a;color:white;text-decoration:none!important;font-size:13px;font-weight:600}.links a.secondary{background:#f0f1f4;color:#333}.cards{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:22px 0}.card{background:#f6f6f8;border:1px solid var(--line);border-radius:16px;padding:20px}.card h3{margin:0 0 8px}.card p{font-size:14px;margin:0}.footer{background:white;border-top:1px solid var(--line);padding:30px 20px}.foot{max-width:1140px;margin:auto;display:flex;justify-content:space-between;align-items:center;gap:24px;color:#858891;font-size:11px}.footlinks{display:flex;gap:16px;flex-wrap:wrap}.foot a{color:#666;text-decoration:none}.social{display:flex;gap:12px}.social a{font-size:11px}.hidden{display:none!important}:focus-visible{outline:3px solid #1677ff;outline-offset:3px}@media(max-width:760px){.nav{padding:10px 18px;min-height:64px}.navlinks{display:none}.layout{grid-template-columns:1fr;gap:16px}.toc{position:static;display:grid;grid-template-columns:1fr 1fr;gap:0 16px}.toc strong{grid-column:1/-1}.intro{padding:56px 0 30px}.content{padding:24px;border-radius:18px}.cards{grid-template-columns:1fr}.foot{align-items:flex-start;flex-direction:column}.wrap{width:calc(100% - 32px)}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}