:root{--bg:#fbfaf7;--ink:#1d2433;--muted:#5d6678;--line:#e4e1d8;--card:#fff;--accent:#8a1c2b;--accent2:#f3e9e4;--max:1120px}
@media (prefers-color-scheme:dark){:root{--bg:#14171d;--ink:#e8e6e1;--muted:#a2a9b6;--line:#2a2f39;--card:#1b1f27;--accent:#e0717f;--accent2:#2a1d21}}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.6 Georgia,"Times New Roman",serif}
h1,h2,h3,.logo,nav,.btn,.tag,.chip,input,dt,.stats{font-family:-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif}
a{color:var(--accent)}img{max-width:100%;display:block}
.wrap{max-width:var(--max);margin:0 auto;padding:0 16px}
.top{border-bottom:1px solid var(--line);background:var(--bg);position:sticky;top:0;z-index:5}
.bar{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:64px;flex-wrap:wrap}
.logo{font-weight:700;text-decoration:none;color:var(--ink);display:flex;align-items:center;gap:10px}
.mark{background:var(--accent);color:#fff;font-size:12px;padding:4px 6px;border-radius:4px;letter-spacing:.05em}
nav{display:flex;gap:18px;flex-wrap:wrap}nav a{color:var(--muted);text-decoration:none;font-size:15px}nav a.on,nav a:hover{color:var(--ink)}
.hero{background:var(--accent2);padding:72px 0 64px;margin-bottom:40px}
.hero h1{font-size:clamp(30px,5vw,48px);line-height:1.15;margin:0 0 16px}.hero p{max-width:640px;font-size:18px;color:var(--muted)}
.btn{display:inline-block;background:var(--accent);color:#fff;text-decoration:none;padding:11px 20px;border-radius:6px;font-weight:600;margin:8px 8px 0 0}
.btn.ghost{background:transparent;color:var(--accent);border:1px solid var(--accent)}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:20px;margin:16px 0 40px}
.card{background:var(--card);border:1px solid var(--line);border-radius:10px;overflow:hidden;text-decoration:none;color:var(--ink);transition:transform .15s}
.card:hover{transform:translateY(-2px)}.thumb{aspect-ratio:16/9;background:var(--line);overflow:hidden}.thumb img{width:100%;height:100%;object-fit:cover}
.cbody{padding:12px 14px 16px}.cbody h3{font-size:16px;margin:6px 0 4px;line-height:1.3}.cbody p{margin:0;color:var(--muted);font-size:14px}
.tag{font-size:11px;text-transform:uppercase;letter-spacing:.08em;color:var(--accent);font-weight:700}
.page{padding:32px 16px 56px}.page h1{font-size:clamp(26px,4vw,38px);line-height:1.2}.lead{font-size:19px;color:var(--muted)}
.small{font-size:13px;color:var(--muted)}.crumbs{font-size:13px;color:var(--muted)}.crumbs a{color:var(--muted)}
.lecture{padding:24px 16px 56px}.lgrid{display:grid;grid-template-columns:1.4fr 1fr;gap:32px;align-items:start}
.shot img{border-radius:10px;border:1px solid var(--line)}.linfo h1{font-size:28px;line-height:1.2;margin:6px 0 12px}
dl{display:grid;grid-template-columns:110px 1fr;gap:4px 12px;margin:0 0 16px}dt{color:var(--muted);font-size:14px}dd{margin:0}
.about-l{max-width:760px;margin-top:32px}.pn{display:flex;justify-content:space-between;gap:16px;margin:32px 0;border-top:1px solid var(--line);padding-top:16px}.pn .r{margin-left:auto;text-align:right}
.tools{display:flex;gap:16px;flex-wrap:wrap;align-items:center;margin:16px 0}
input[type=search]{flex:1;min-width:220px;padding:10px 14px;border:1px solid var(--line);border-radius:6px;background:var(--card);color:var(--ink);font-size:16px}
.chips{display:flex;gap:8px;flex-wrap:wrap}.chip{border:1px solid var(--line);background:var(--card);color:var(--ink);padding:7px 14px;border-radius:20px;cursor:pointer;font-size:14px}.chip.on{background:var(--accent);color:#fff;border-color:var(--accent)}
.clist2{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px;margin:16px 0 40px}
.crow{display:block;background:var(--card);border:1px solid var(--line);border-radius:10px;padding:18px;text-decoration:none;color:var(--ink)}.crow h3{margin:4px 0 6px;font-size:18px}.crow p{margin:0;color:var(--muted)}
.clist li{margin:4px 0}.split{display:grid;grid-template-columns:1.3fr 1fr;gap:40px;align-items:center;margin:24px auto 48px}
.stats{display:grid;grid-template-columns:1fr 1fr;gap:16px}.stats div{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:18px}.stats b{display:block;font-size:32px;color:var(--accent)}.stats span{color:var(--muted)}
.steps li{margin:12px 0}details{border-bottom:1px solid var(--line);padding:12px 0}summary{cursor:pointer;font-weight:600}
.post p{max-width:720px}
.foot{border-top:1px solid var(--line);margin-top:40px;padding:40px 0 24px;font-size:14px}
.foot .cols{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:24px}.foot a{display:block;color:var(--muted);text-decoration:none;margin:4px 0}.foot p{color:var(--muted)}.copy{margin-top:24px}
@media (max-width:760px){.lgrid,.split{grid-template-columns:1fr}.foot .cols{grid-template-columns:1fr 1fr}nav{gap:12px}.hero{padding:48px 0}}
.lgrid>*,.split>*{min-width:0}.pn{flex-wrap:wrap}.pn a{overflow-wrap:anywhere}h1,h3{overflow-wrap:anywhere}
.auth{display:flex;gap:8px;align-items:center;font-family:-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;font-size:14px}
.hbtn{display:inline-block;background:var(--accent);color:#fff;text-decoration:none;padding:7px 14px;border-radius:6px;font-weight:600;font-size:14px;border:1px solid var(--accent);cursor:pointer}
.hbtn.ghost{background:transparent;color:var(--accent)}.auth .hi{color:var(--muted)}
.authform{max-width:420px;display:grid;gap:14px;margin:24px 0;font-family:-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif}
.authform label{display:grid;gap:6px;font-size:14px;color:var(--muted)}.authform label.check{display:flex;gap:8px;align-items:flex-start}
.authform input:not([type=checkbox]){padding:10px 12px;border:1px solid var(--line);border-radius:6px;background:var(--card);color:var(--ink);font-size:16px}
.authform button{border:0;cursor:pointer;font-size:16px;justify-self:start}.err{color:#c0392b;margin:0;font-size:14px}