*{box-sizing:border-box;margin:0;padding:0}
:root{--accent:#5B6BE8;--dark:#111827;--light:#f8f9fb;--gray:#6b7280}
body{font-family:'Inter',system-ui,sans-serif;color:var(--dark);line-height:1.7;background:#fff}
a{color:var(--accent)}
.lg-nav{display:flex;align-items:center;justify-content:space-between;padding:1rem 2rem;border-bottom:1px solid #e5e7eb;position:sticky;top:0;background:#fff;z-index:10}
.lg-logo{display:flex;align-items:center;gap:.6rem;text-decoration:none;color:var(--dark);font-weight:700;font-size:.95rem}
.lg-logo img{height:32px;width:auto}
.lg-back{font-size:.875rem;font-weight:600;text-decoration:none}
.lg-wrap{max-width:780px;margin:0 auto;padding:3rem 1.5rem 4rem}
.lg-wrap h1{font-size:2.2rem;line-height:1.2;font-weight:800;margin-bottom:.5rem}
.lg-updated{color:var(--gray);font-size:.9rem;margin-bottom:2rem}
.lg-toc{background:var(--light);border-radius:12px;padding:1.25rem 1.5rem;margin-bottom:2.5rem}
.lg-toc h2{font-size:.8rem;letter-spacing:.08em;text-transform:uppercase;color:var(--gray);margin-bottom:.6rem}
.lg-toc ol{padding-left:1.25rem;columns:2;column-gap:2rem;font-size:.92rem}
.lg-toc li{margin-bottom:.25rem}
section.lg-sec{margin-bottom:2rem;scroll-margin-top:5rem}
section.lg-sec h2{font-size:1.25rem;font-weight:700;margin-bottom:.6rem}
section.lg-sec p{margin-bottom:.9rem;color:#374151}
section.lg-sec ul{margin:0 0 .9rem 1.25rem;color:#374151}
section.lg-sec li{margin-bottom:.45rem}
.lg-foot{background:var(--dark);color:rgba(255,255,255,.75);text-align:center;padding:2rem 1.5rem;font-size:.85rem}
.lg-foot a{color:#fff;margin:0 .6rem}
@media(max-width:640px){.lg-toc ol{columns:1}.lg-nav{padding:1rem}.lg-wrap h1{font-size:1.8rem}}