:root{--ink:#1d2733;--muted:#5b6672;--accent:#d97706;--accent2:#1f618d;--bg:#fbfaf7;--card:#fff;--line:#e6e2d8}
*{box-sizing:border-box}
body{margin:0;font:17px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI",Helvetica,Arial,sans-serif;color:var(--ink);background:var(--bg);display:flex}
#side{width:300px;flex:0 0 300px;height:100vh;position:sticky;top:0;overflow-y:auto;background:#1d2733;color:#dfe6ee;padding:16px 14px;font-size:14px;line-height:1.4}
#side a{color:#dfe6ee;text-decoration:none;display:block;padding:3px 6px;border-radius:5px}
#side a:hover{background:#2c3a4a}#side a.cur{background:var(--accent);color:#fff}
#side .home{font-size:18px;font-weight:700;margin-bottom:12px;color:#f7c948}
#side ol,#side ul{margin:4px 0 10px 0;padding-left:22px}#side li{margin:1px 0}
#side .navcourse{margin-bottom:14px}#side .navlabs{margin:4px 0 0 6px;color:#f7c948;font-size:12px;text-transform:uppercase;letter-spacing:.05em}
#side .navextra{margin-top:6px}
main{flex:1;min-width:0;padding:28px 48px 60px}
article{max-width:900px;margin:0 auto}
h1{font-size:2.0em;line-height:1.2;margin:.3em 0 .4em;color:#13202e}
h2{font-size:1.45em;margin:1.8em 0 .5em;padding-top:.3em;border-top:2px solid var(--line);color:#13202e}
h3{font-size:1.15em;margin:1.4em 0 .4em}
a{color:var(--accent2)}
.crumb{color:var(--muted);font-size:14px}
.media{background:#fff7e6;border:1px solid #f3d9a4;border-radius:10px;padding:10px 14px;margin:10px 0 18px;font-size:14px}
.media audio{vertical-align:middle;height:36px;width:340px;max-width:100%}
figure.fig{margin:22px 0;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px;text-align:center}
figure.fig img{max-width:100%;height:auto}
figcaption{font-size:14.5px;color:var(--muted);text-align:left;margin-top:8px}
table{border-collapse:collapse;margin:14px 0;font-size:15px;width:100%}
th,td{border:1px solid var(--line);padding:6px 9px;text-align:left;vertical-align:top}th{background:#f3efe6}
code{background:#f1ede4;padding:1px 4px;border-radius:4px;font-size:.92em}
pre{background:#1d2733;color:#e8eef5;padding:12px 14px;border-radius:8px;overflow-x:auto}pre code{background:none;color:inherit}
.admonition,details{border-left:5px solid var(--accent2);background:#fff;border-radius:8px;padding:8px 16px;margin:16px 0;box-shadow:0 1px 2px rgba(0,0,0,.05)}
.admonition-title,details summary{font-weight:700;margin:6px 0}
.admonition.note{border-color:#1f618d;background:#f2f7fb}
.admonition.example{border-color:#7d3c98;background:#f8f3fb}
.admonition.warning{border-color:#c0392b;background:#fdf3f2}
.admonition.tip{border-color:#1e8449;background:#f1f9f4}
.admonition.danger{border-color:#922b21;background:#fbeeee}
.admonition.info{border-color:#d97706;background:#fff8ec}
details.question{border-color:#d97706}details summary{cursor:pointer}
.katex-display{overflow-x:auto;overflow-y:hidden;padding:4px 0}
.prevnext{display:flex;justify-content:space-between;margin-top:40px;font-weight:600}.prevnext .next{margin-left:auto}
footer{max-width:900px;margin:50px auto 0;color:var(--muted);font-size:13px;border-top:1px solid var(--line);padding-top:12px}
.focus{outline:4px solid rgba(217,119,6,.85);outline-offset:6px;border-radius:10px;transition:outline-color .3s}
/* recording mode: no sidebar, larger type, page content centred for 1280x720 capture */
body.rec #side,body.rec .media,body.rec .prevnext,body.rec footer,body.rec .crumb{display:none}
body.rec main{padding:20px 60px}body.rec{font-size:19px}
body.rec details{open:true}
@media print{#side{display:none}}
.scene{margin:1.1em 0;padding-left:12px;border-left:3px solid #e5e7eb}.scene p{margin:.3em 0}
.cue{display:inline-block;font:12px/1.6 ui-monospace,Menlo,monospace;color:#6b7280;background:#f3f4f6;border-radius:4px;padding:0 6px;text-decoration:none}
td audio{width:220px;height:32px}

/* phone layout */
#navtoggle{display:none}
body.rec #navtoggle{display:none!important}
article{overflow-wrap:break-word}
img,video,svg{max-width:100%;height:auto}
@media (max-width:900px){
  body{display:block;font-size:16.5px}
  #side{position:static;width:auto;height:auto;padding:12px 14px}
  html.js #side{display:none}html.js body.navopen #side{display:block}
  #navtoggle{display:block;position:sticky;top:0;z-index:10;width:100%;border:0;background:#1d2733;color:#f7c948;font:600 16px/1 inherit;font-family:inherit;padding:14px 16px;text-align:left}
  #side a{padding:8px 6px}
  main{padding:14px 16px 50px}
  h1{font-size:1.6em}h2{font-size:1.3em}
  table{display:block;overflow-x:auto;-webkit-overflow-scrolling:touch}
  .media audio{display:block;width:100%;margin-bottom:8px}
  .media a{display:inline-block;padding:4px 0}
  table.lec,table.lec tbody,table.lec tr,table.lec td,table.lec th{display:block;width:100%}
  table.lec tr:first-child{display:none}
  table.lec tr{border:1px solid var(--line);border-radius:10px;background:#fff;margin:10px 0;padding:8px 10px}
  table.lec td{border:0;padding:3px 0}
  table.lec td audio{width:100%;height:40px}
  .prevnext a{padding:10px 0}
  pre{font-size:13px}
}