:root{--bg:#f7f8fc;--card:#fff;--ink:#0d1330;--muted:#5a6383;--line:#e3e7f2;--brand:#4f46e5;--soft:#eceaff}
@media (prefers-color-scheme:dark){:root{--bg:#080c1c;--card:#111936;--ink:#e9edfb;--muted:#9aa4c3;--line:#1e2850;--brand:#8b84ff;--soft:#1c2150}}
*{box-sizing:border-box}body{font-family:"Plus Jakarta Sans",system-ui,sans-serif;background:var(--bg);color:var(--ink);line-height:1.75;margin:0}
main{max-width:800px;margin:0 auto;padding:40px 20px 64px}
.back{display:inline-block;color:var(--brand);font-weight:700;text-decoration:none;margin-bottom:24px}
h1{font-size:clamp(1.9rem,4vw,2.4rem);letter-spacing:-.03em;margin:0 0 6px;line-height:1.15}h2{font-size:1.2rem;margin:36px 0 8px;scroll-margin-top:20px}
p,li{color:var(--muted)}a{color:var(--brand)}ul,ol{padding-left:20px}
.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:18px 22px;margin-top:26px}
.hl{background:var(--soft);border:1px solid var(--brand);border-radius:16px;padding:6px 22px 18px;margin-top:30px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px;margin-top:16px}
.grid div{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:16px}
.grid b{display:block}
.links{margin-top:30px;font-size:.9rem}
.btn{display:inline-block;background:var(--brand);color:#fff;padding:12px 22px;border-radius:12px;font-weight:700;text-decoration:none;margin-top:10px}