:root{--bg:#fafaf7;--fg:#1f2328;--muted:#6b7280;--card:#fff;--line:#e5e7eb;--accent:#2563eb;--soft:#eff6ff}
@media (prefers-color-scheme:dark){:root{--bg:#111418;--fg:#e6e6e6;--muted:#9aa3ae;--card:#1a1f25;--line:#2c333b;--accent:#6ea8ff;--soft:#16233a}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--fg);font:17px/1.75 -apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC","Segoe UI",Roboto,Helvetica,Arial,sans-serif}
a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}
.top{position:sticky;top:0;z-index:5;background:var(--card);border-bottom:1px solid var(--line);padding:.6rem 1rem}
.brand{font-weight:700;color:var(--fg)}
main{max-width:760px;margin:0 auto;padding:1rem 1.1rem 3rem}
footer{text-align:center;color:var(--muted);font-size:.8rem;padding:2rem 1rem}
h1{font-size:1.6rem;line-height:1.35;margin:.6rem 0 .3rem}
h2{font-size:1.25rem;margin:1.6rem 0 .6rem}
h3{font-size:1.08rem;margin:1.2rem 0 .4rem}
.crumbs{font-size:.85rem;color:var(--muted)}
.meta,.muted,small{color:var(--muted)}.meta{margin:.1rem 0 .8rem;font-size:.92rem}
.lead{font-size:1.05rem;background:var(--soft);border-radius:10px;padding:.7rem .9rem}
.current{background:var(--card);border:2px solid var(--accent);border-radius:14px;padding:.4rem 1rem 1rem;margin:1rem 0}
.current h2{margin-top:.2rem}.tag{display:inline-block;margin:.6rem 0 0;background:var(--accent);color:#fff;border-radius:99px;padding:0 .7rem;font-size:.8rem}
.cards{list-style:none;padding:0;margin:.5rem 0;display:grid;gap:.6rem}
.cards a{display:block;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:.7rem .9rem;color:var(--fg)}
.cards a:hover{border-color:var(--accent);text-decoration:none}
.cards b{display:block}.cards small{display:block;font-size:.85rem}.cards span{display:block;color:var(--muted);font-size:.92rem}
.weeks{padding-left:1.2rem}.weeks li.on>a{font-weight:700}
.toc{display:flex;flex-wrap:wrap;gap:.4rem;margin:.8rem 0}
.toc a{background:var(--card);border:1px solid var(--line);border-radius:99px;padding:.15rem .75rem;font-size:.9rem}
.lsec{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:.2rem 1rem .8rem;margin:1rem 0;scroll-margin-top:3.5rem}
.lsec>h2{margin:.8rem 0 .5rem;padding-bottom:.4rem;border-bottom:1px solid var(--line)}
.media{margin:.7rem 0}.media figcaption{font-size:.9rem;color:var(--muted);margin-bottom:.25rem}
audio{width:100%}video{width:100%;max-height:70vh;background:#000;border-radius:10px}
.pdf a{display:inline-block;border:1px solid var(--line);border-radius:10px;padding:.35rem .8rem;background:var(--soft)}
blockquote{margin:.8rem 0;padding:.3rem .9rem;border-left:4px solid var(--accent);background:var(--soft);border-radius:0 8px 8px 0}
table{border-collapse:collapse;width:100%;display:block;overflow-x:auto;font-size:.95rem}
th,td{border:1px solid var(--line);padding:.35rem .6rem;text-align:left}th{background:var(--soft)}
code{background:var(--soft);padding:.05rem .3rem;border-radius:4px;font-size:.92em}
pre{overflow-x:auto;background:var(--soft);padding:.7rem;border-radius:8px}
img{max-width:100%;height:auto}
.pager{display:flex;justify-content:space-between;gap:.5rem;margin:2rem 0 0;font-size:.95rem}
@media print{.top,.toc,.pager,footer,audio,video{display:none}.lsec{border:0;padding:0}body{background:#fff;color:#000}}