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h2{font-size:15px;margin:0;padding:14px 16px;background:#f7f6fc;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;gap:8px}.psm h2 small{color:#57537a;font-weight:500}.psm ul{list-style:none;margin:0;padding:0}.psm a{display:flex;gap:10px;align-items:flex-start;padding:10px 16px;color:var(--ink);text-decoration:none;font-size:14px;border-bottom:1px solid #F1F0F7}.psm a:hover{background:#f7f6fc}.psm a.on{background:#ede9fe;font-weight:700}.tick{width:18px;height:18px;border:2px solid #9CA3AF;border-radius:4px;flex-shrink:0;font-size:12px;line-height:14px;text-align:center;color:#fff}.tick.y{background:#047857;border-color:#047857}.pmain{flex:1;min-width:0;padding:var(--s5) clamp(16px,4vw,48px) var(--s7);max-width:960px}.pmain h1{font-size:clamp(24px,3vw,32px);margin:4px 0 16px}.video{position:relative;aspect-ratio:16/9;background:#000;border-radius:12px;overflow:hidden;margin-bottom:20px}.video iframe{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;height:100%;border:0}.pnav{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;margin:var(--s6) 0 8px;padding-top:var(--s4);border-top:1px solid var(--line)}kbd{background:#f3f0ff;border:1px solid #DDD6FE;border-radius:4px;padding:0 5px;font-size:12px}.ltabs{margin-top:var(--s6)}.note{border:1px solid var(--line);border-radius:10px;padding:12px;margin:10px 0;background:#fff}.note p{margin:4px 0}.answer{background:#ecfdf5;border-radius:8px;padding:10px;margin-top:8px}.quiz fieldset{border:0;padding:0;margin:0 0 16px}.quiz legend{font-weight:700;margin-bottom:6px}.opt{display:flex;gap:8px;align-items:center;font-weight:400;margin:4px 0}.pscrim{display:none}@media (max-width:960px){.pside{position:fixed;top:0;left:0;bottom:0;max-height:none;z-index:60;width:min(86vw,360px);box-shadow:var(--shadow)}.pscrim{display:block;position:fixed;top:0;right:0;bottom:0;left:0;background:#00000073;z-index:55}.pprog .bar{width:70px}.phead{top:64px}}.pmain section{padding:0}.cmain .box,.pmain .box{padding:var(--s5);margin-top:var(--s5)}.buy .f,.pmain .f,.box .f{padding:0;border:0;box-shadow:none;background:none!important;border-radius:0;gap:10px}@media (max-width:960px){.buy .buy-cover{display:none}}.sf p a{display:inline!important}.sf-in nav a{display:inline-block}main#main,.wrap[aria-busy]{min-height:100vh}