:root{color-scheme:light dark;--bg:#f5f7fc;--card:#fff;--ink:#15213a;--muted:#52617a;--line:#dce3ef;--accent:#315fd8;--soft:#eaf0ff}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.7 system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}a{color:var(--accent);text-underline-offset:4px}a:focus-visible,button:focus-visible{outline:3px solid var(--accent);outline-offset:4px;border-radius:4px}.wrap{max-width:1020px;margin:auto;padding:0 24px}.top{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:22px 0}.brand{font-size:23px;font-weight:750;letter-spacing:-.7px;color:var(--ink);text-decoration:none}.mark{display:inline-grid;place-items:center;width:38px;height:38px;border-radius:12px;background:var(--accent);color:white;margin-right:9px;font-size:22px}.lang{display:flex;gap:12px;font-size:14px}.notice{background:var(--soft);border-bottom:1px solid var(--line);font-size:14px}.notice p{margin:0;padding:12px 0}header{background:var(--card);border-bottom:1px solid var(--line)}nav{display:flex;flex-wrap:wrap;gap:6px;padding:0 0 18px}nav a{border-radius:12px;padding:8px 14px;text-decoration:none;color:var(--muted);font-size:15px}nav a[aria-current]{background:var(--soft);color:var(--accent);font-weight:650}.intro{padding:44px 0 26px}.eyebrow{font-size:13px;text-transform:uppercase;letter-spacing:1.8px;color:var(--accent);font-weight:700}h1{font-size:clamp(30px,6vw,46px);line-height:1.15;letter-spacing:-1.5px;margin:12px 0 18px}h2{font-size:23px;line-height:1.3;letter-spacing:-.4px;margin:0 0 12px}.lead{max-width:720px;color:var(--muted);font-size:19px}.layout{display:grid;grid-template-columns:220px 1fr;gap:26px;align-items:start}aside{position:sticky;top:20px;font-size:14px;padding:12px 0}aside a{display:block;text-decoration:none;color:var(--muted);padding:5px 0}section{background:var(--card);border:1px solid var(--line);border-radius:20px;padding:28px;margin-bottom:18px;scroll-margin-top:20px}section p{margin:10px 0}section p:last-child{margin-bottom:0}.links{display:flex;flex-wrap:wrap;gap:10px}.links a{display:inline-flex;padding:9px 15px;border:1px solid var(--line);border-radius:12px;text-decoration:none}footer{padding:32px 0 44px;font-size:14px;color:var(--muted)}.skip{position:absolute;left:-9999px}.skip:focus{left:20px;top:10px;background:var(--card);padding:12px;z-index:10}@media(max-width:700px){.wrap{padding:0 18px}.top{padding:18px 0}.layout{display:block}aside{position:static;display:flex;gap:8px;overflow:auto;margin-bottom:18px;padding:0 0 10px}aside a{white-space:nowrap;border:1px solid var(--line);border-radius:20px;padding:5px 12px}section{padding:22px;border-radius:18px}.intro{padding-top:30px}.lead{font-size:17px}}@media(prefers-color-scheme:dark){:root{--bg:#0c1322;--card:#131e31;--ink:#eef3ff;--muted:#b2bfd6;--line:#2a3850;--accent:#9ab7ff;--soft:#202f4e}.mark{background:#416ee2;color:white}}