:root{--ground:#EEF2F8;--paper:#fff;--ink:#12212E;--muted:#54677A;--line:#DBE3EE;--head:#0F3A5F;--accent:#1D69C9;--primary:#0F3A5F}
:root:not([data-theme="light"]){@media(prefers-color-scheme:dark){--ground:#0A141E;--paper:#101F2C;--ink:#E4EDF5;--muted:#9DAFBF;--line:#213241;--head:#CFE3F5;--accent:#62A6F0;--primary:#13456B}}
:root[data-theme="dark"]{--ground:#0A141E;--paper:#101F2C;--ink:#E4EDF5;--muted:#9DAFBF;--line:#213241;--head:#CFE3F5;--accent:#62A6F0;--primary:#13456B}
*{box-sizing:border-box}
img{max-width:100%;height:auto}
body{margin:0;background:var(--ground);color:var(--ink);font-family:"IBM Plex Sans",system-ui,-apple-system,Segoe UI,Roboto,sans-serif;font-size:16px;line-height:1.62;-webkit-font-smoothing:antialiased}
.lwrap{max-width:820px;margin:0 auto;padding:0 22px}
header.lhead{border-bottom:1px solid var(--line);background:var(--paper);position:sticky;top:0;z-index:10}
header.lhead .lwrap{display:flex;align-items:center;justify-content:space-between;height:66px;gap:16px}
.lhead img{height:34px;width:auto;display:block}
.lhead .logo-dark{display:none}
:root:not([data-theme="light"]){@media(prefers-color-scheme:dark){.lhead .logo-light{display:none}.lhead .logo-dark{display:block}}}
:root[data-theme="dark"] .lhead .logo-light{display:none}
:root[data-theme="dark"] .lhead .logo-dark{display:block}
.lhead a.back{color:var(--accent);text-decoration:none;font-size:14px;font-weight:600;white-space:nowrap}
.lhead a.back:hover{text-decoration:underline}
.lright{display:flex;align-items:center;gap:14px}
.themebtn{background:transparent;border:1px solid var(--line);border-radius:50%;width:36px;height:36px;cursor:pointer;color:var(--muted);display:grid;place-items:center;font-size:15px;line-height:1;flex:none}
.themebtn:hover{color:var(--accent);border-color:var(--accent)}
.themebtn:focus-visible{outline:2.5px solid var(--accent);outline-offset:3px}
main{padding:40px 0 64px}
h1{font-family:"Spectral",Georgia,serif;color:var(--head);font-size:2rem;letter-spacing:-.01em;margin:0 0 6px;line-height:1.1}
.updated{color:var(--muted);font-size:13px;margin:0 0 8px}
h2{font-family:"Spectral",serif;color:var(--head);font-size:1.35rem;margin:30px 0 10px}
h3{font-size:1rem;color:var(--head);margin:20px 0 6px}
p,li{color:var(--muted)}
p{margin:0 0 .9em}
ul{padding-left:1.1em;margin:0 0 1em}
li{margin:.3em 0}
li::marker{color:var(--accent)}
strong{color:var(--ink);font-weight:600}
.lang-sep{margin:44px 0;border:none;border-top:2px solid var(--line)}
.note{background:var(--paper);border:1px solid var(--line);border-left:3px solid var(--accent);border-radius:0 10px 10px 0;padding:14px 18px;font-size:14px;margin:20px 0;color:var(--muted)}
footer.lfoot{border-top:1px solid var(--line);background:var(--paper);padding:26px 0;color:var(--muted);font-size:13px;line-height:1.6}
footer.lfoot a{color:var(--accent);text-decoration:none}