.view-options{display:grid;grid-template-columns:.8fr 1fr 1fr;gap:30px;margin:0 5% 70px;padding:45px 0;border-top:1px solid var(--line)}.view-options h2{font-size:34px;line-height:1.25;font-weight:400;letter-spacing:-1px}.view-option{background:#e9efec;padding:28px;border-radius:8px}.view-option:hover{text-decoration:none;background:#e1eae7}.view-option h3{font-size:24px;margin:20px 0 10px}.view-option p{font-size:14px;color:var(--muted)}.option-icon{font-size:22px;color:var(--teal)}.reading-chapters{position:sticky;top:88px;z-index:5;display:flex;gap:20px;background:#f7f8f5f5;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:15px 5%;overflow:auto;white-space:nowrap;font-size:12px;color:var(--teal)}.reading-slides{max-width:1400px;margin:auto;padding:10px 5% 70px}.reading-slide{display:grid;grid-template-columns:1.2fr 1fr;gap:50px;padding:55px 0;border-bottom:1px solid var(--line);scroll-margin-top:150px}.reading-figure img{width:100%;border-radius:8px;border:1px solid var(--line);background:#fff;display:block;margin-bottom:16px}.reading-figure{position:sticky;top:165px;align-self:start}.reading-text h2{font-size:29px;line-height:1.25;letter-spacing:-.6px;margin:0 0 20px}.reading-text p:not(.eyebrow){font-size:18px;line-height:1.85;color:#314f5b}.learn-content{max-width:1200px;margin:auto;padding:20px 5% 80px}.book-feature{display:grid;grid-template-columns:240px 1fr;gap:50px;align-items:center;background:#e9efec;padding:42px;border-radius:10px;margin-bottom:55px}.book-feature img{width:100%;box-shadow:0 15px 30px #102c3a24}.book-feature h2{font-size:36px;line-height:1.2;letter-spacing:-.7px}.book-feature p{color:var(--muted)}.video-grid{display:grid;grid-template-columns:1fr 1fr;gap:35px}.video-card iframe{width:100%;aspect-ratio:16/9;border:0;border-radius:8px;background:#e9efec}.video-card h3{font-size:21px;line-height:1.4;margin:16px 0 8px}.video-card p{font-size:14px;color:var(--muted)}.language-tag{display:inline-block;font-size:10px;font-weight:700;letter-spacing:1px;color:var(--teal);background:#e9efec;border-radius:4px;padding:4px 8px}.channel-feature{margin-top:50px;padding:28px 35px;background:#e9efec;border-radius:9px}.channel-feature h2{font-size:25px}.channel-feature p{color:var(--muted)}@media(max-width:760px){.view-options{grid-template-columns:1fr;gap:18px;margin-bottom:40px}.view-options h2{margin:0}.reading-chapters{top:71px;gap:15px}.reading-slide{grid-template-columns:1fr;gap:26px;padding:35px 0}.reading-figure{position:static}.reading-text h2{font-size:25px}.reading-text p:not(.eyebrow){font-size:17px}.book-feature{grid-template-columns:1fr;padding:25px;gap:22px}.book-feature img{width:180px}.book-feature h2{font-size:28px}.video-grid{grid-template-columns:1fr}.site-header nav{gap:12px}.site-header nav a:nth-child(3){display:block}}
.keywords-layout{max-width:1350px;margin:15px auto 80px;padding:0 5%;display:grid;grid-template-columns:240px minmax(0,1fr);gap:60px}.keyword-toc{position:sticky;top:120px;align-self:start;display:flex;flex-direction:column;gap:16px;font-size:13px;color:var(--teal);border-left:2px solid var(--line);padding-left:20px}.keyword-entry{padding:20px 0 45px;border-bottom:1px solid var(--line);margin-bottom:30px;scroll-margin-top:110px}.keyword-entry h2{font-size:33px;line-height:1.2;letter-spacing:-.6px;margin:12px 0 23px}.keyword-entry>p:not(.eyebrow){font-size:18px;line-height:1.85}.equation{margin:28px 0;padding:25px 22px;background:#e9efec;border-radius:8px;overflow-x:auto;font-size:16px}.notation-note{font-size:13px!important;color:var(--muted)!important;line-height:1.8!important}.keyword-links{display:flex;flex-wrap:wrap;gap:18px;font-size:12px;color:var(--teal);margin-top:22px}.site-header nav{gap:20px}.site-header nav a:nth-last-child(2){display:none}@media(max-width:1100px){.site-header nav{gap:13px;font-size:12px}.site-header nav a:last-child{display:none}.keywords-layout{gap:35px;grid-template-columns:190px minmax(0,1fr)}}@media(max-width:760px){.site-header nav a:nth-child(3){display:none}.site-header nav a:nth-child(4),.site-header nav a:nth-child(5){display:none}.site-header{position:relative}.keywords-layout{grid-template-columns:1fr;gap:25px}.keyword-toc{position:static;flex-direction:row;flex-wrap:wrap;gap:12px;font-size:12px}.keyword-entry h2{font-size:28px}.keyword-entry>p:not(.eyebrow){font-size:17px}.equation{padding:18px 12px;font-size:13px}.reading-chapters{top:0}body:has(.keyword-toc) .site-header nav a:nth-child(3){display:block}}
.section-heading h1{font-size:38px;line-height:1.15;letter-spacing:-1px;margin:0 0 12px}.mobile-menu{display:none}.slide-stage video{width:100%;height:100%;object-fit:contain;background:#fff}.slide-stage [hidden]{display:none!important}@media(max-width:760px){.site-header nav{display:none!important}.mobile-menu{display:block;position:relative;font-size:13px;color:var(--teal)}.mobile-menu summary{cursor:pointer;padding:7px 12px;border:1px solid var(--line);border-radius:5px;list-style:none}.mobile-menu>div{position:absolute;right:0;top:42px;width:200px;padding:14px 18px;background:var(--paper);border:1px solid var(--line);box-shadow:0 8px 24px #102c3a20;z-index:20;border-radius:6px;display:flex;flex-direction:column;gap:13px}.section-heading h1{font-size:34px}}
.reading-demo{display:block;width:100%;aspect-ratio:4/3;background:#fff;border:1px solid var(--line);border-radius:8px;margin-top:18px}
.reading-figure img{aspect-ratio:1.414/1;object-fit:contain}
.timeline-controls{display:flex;align-items:center;gap:10px;margin-top:12px;flex-wrap:wrap}.timeline-controls button,#retry-audio{border:1px solid #bfcecf;background:white;border-radius:5px;padding:6px 10px;color:var(--teal);font-size:13px}.timeline-controls input{flex:1;min-width:100px;accent-color:var(--teal)}.timeline-controls output{font-size:12px;color:var(--muted);font-variant-numeric:tabular-nums}.timeline-controls button:disabled{opacity:.45}
audio[hidden]{display:none!important}

.channel-thumbnail{display:block;float:right;width:min(360px,40%);margin:0 0 20px 32px;text-decoration:none}.channel-thumbnail img{display:block;width:100%;aspect-ratio:16/9;object-fit:cover;border-radius:12px}.channel-thumbnail span{display:block;margin-top:10px;font-weight:700;color:var(--teal,#125d59)}.channel-feature{display:flow-root}.book-feature .eyebrow a{color:inherit;text-decoration:underline;text-underline-offset:3px}.video-card .text-link{display:inline-block;margin-top:16px}@media(max-width:650px){.channel-thumbnail{float:none;width:100%;max-width:360px;margin:0 0 24px}}

.cpc-ms-figure{margin:28px 0}.cpc-ms-illustration{aspect-ratio:1.95;overflow:hidden;background:white;border-radius:12px}.cpc-ms-illustration img{display:block;width:100%;height:auto}.cpc-ms-figure figcaption{font-size:14px;color:#546568;margin-top:12px}

@media(min-width:761px){.keyword-toc{max-height:calc(100vh - 145px);overflow-y:auto;padding-bottom:12px;gap:13px}}