:root{color-scheme:light;--paper: #f3efe7;--surface: #fffdf8;--surface-2: #ebe6dc;--ink: #11233f;--ink-soft: #334258;--muted: #707681;--line: rgba(17, 35, 63, .14);--line-strong: rgba(17, 35, 63, .25);--accent: #e76f51;--accent-soft: #f7d9cf;--teal: #438f82;--shadow: 0 16px 45px rgba(24, 31, 44, .07);--font-sans: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--font-serif: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Palatino, Georgia, serif;--text-scale: 1;font-family:var(--font-sans);font-synthesis:none;text-rendering:optimizeLegibility}:root[data-theme=dark]{color-scheme:dark;--paper: #0d1625;--surface: #142136;--surface-2: #1a2940;--ink: #f3eee4;--ink-soft: #ccd3db;--muted: #9aa7b6;--line: rgba(235, 240, 246, .13);--line-strong: rgba(235, 240, 246, .24);--accent: #f18b6f;--accent-soft: #4b2c2b;--teal: #67b3a5;--shadow: 0 18px 55px rgba(0, 0, 0, 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8px}.part-label>span{display:grid;place-items:center;width:25px;height:25px;border-radius:8px;color:#fff;font-family:var(--font-serif);font-size:13px}.part-label div{display:flex;flex-direction:column}.part-label small{color:var(--muted);font-size:8px;letter-spacing:.12em;text-transform:uppercase}.part-label b{font-size:12px}.lecture-links{display:grid;gap:2px}.lecture-links button{appearance:none;border:0;background:transparent;width:100%;display:grid;grid-template-columns:23px 1fr;align-items:center;gap:8px;padding:7px;border-radius:8px;color:var(--muted);text-align:left;font-size:11px;line-height:1.25;transition:background .15s,color .15s}.lecture-links button:hover{color:var(--ink);background:var(--surface-2)}.lecture-links button.active{color:var(--ink);background:var(--accent-soft);font-weight:700}.lecture-links button i{display:grid;place-items:center;width:21px;height:21px;border:1px solid var(--line);border-radius:50%;font-size:8px;font-style:normal}.lecture-links button 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div{display:flex;align-items:baseline;gap:7px}.hero-facts strong{font-family:var(--font-serif);font-size:25px}.hero-facts span{color:var(--muted);font-size:10px;text-transform:uppercase;letter-spacing:.08em}.hero-graph{position:relative;aspect-ratio:1/1.03;max-width:570px;width:100%;margin:auto;border:1px solid var(--line);border-radius:50%;background:radial-gradient(circle at 50% 50%,color-mix(in srgb,var(--surface) 65%,transparent),transparent 60%),repeating-radial-gradient(circle,transparent 0 48px,var(--line) 49px 50px)}.hero-graph:before,.hero-graph:after{content:"";position:absolute;inset:13%;border:1px dashed var(--line-strong);border-radius:50%}.hero-graph:after{inset:29%;border-style:solid}.orbit{position:absolute;border-radius:50%;border:1px solid var(--line)}.orbit.one{inset:7% 18%;transform:rotate(31deg)}.orbit.two{inset:20% 5%;transform:rotate(-28deg)}.hero-graph .node{position:absolute;z-index:2;display:grid;place-items:center;width:82px;height:82px;border-radius:50%;background:var(--surface);border:2px solid var(--ink);box-shadow:0 9px 25px #11233f1c}.hero-graph .node b{font-family:var(--font-serif);font-size:25px;line-height:.9}.hero-graph .node small{color:var(--muted);font-size:8px;letter-spacing:.08em;text-transform:uppercase}.hero-graph .n1{left:4%;top:47%}.hero-graph .n2{left:40%;top:7%;border-color:var(--accent)}.hero-graph .n3{right:3%;top:42%;border-color:#8d6aa8}.hero-graph .n4{left:42%;bottom:3%;border-color:var(--teal)}.hero-graph .edge{position:absolute;height:2px;background:var(--ink);opacity:.5;transform-origin:left}.hero-graph .e1{width:41%;left:17%;top:48%;transform:rotate(-49deg)}.hero-graph .e2{width:42%;left:49%;top:23%;transform:rotate(37deg)}.hero-graph .e3{width:41%;right:8%;top:54%;transform:rotate(128deg);transform-origin:right}.hero-graph .e4{width:42%;left:18%;bottom:39%;transform:rotate(46deg)}.hero-graph-caption{position:absolute;left:11%;right:7%;bottom:-38px;display:flex;justify-content:space-between;color:var(--muted);font-size:8px;text-transform:uppercase;letter-spacing:.08em}.continue-band{margin:0 clamp(28px,6vw,90px);padding:30px 34px;display:grid;grid-template-columns:minmax(0,1fr) auto auto;gap:35px;align-items:center;color:#f8f4ec;background:#11233f;border-radius:16px;box-shadow:var(--shadow)}:root[data-theme=dark] .continue-band{background:#080f1b}.continue-band .eyebrow{color:#f19a82}.continue-copy h2{margin:8px 0 5px;font-family:var(--font-serif);font-size:26px;font-weight:500}.continue-copy p{margin:0;max-width:650px;color:#f8f4eca3;font-size:11px;line-height:1.5}.continue-meta{display:flex;align-items:center;gap:13px}.continue-meta>div:last-child{display:flex;flex-direction:column;white-space:nowrap}.continue-meta b{font-size:11px}.continue-meta span{margin-top:4px;color:#f8f4ec99;font-size:9px}.ring{--value: 0deg;display:grid;place-items:center;width:54px;height:54px;border-radius:50%;background:conic-gradient(var(--accent) var(--value),rgba(255,255,255,.14) 0)}.ring:before{content:"";grid-area:1/1;width:42px;height:42px;border-radius:50%;background:#11233f}.ring span{grid-area:1/1;z-index:1;color:#fff;font-family:var(--font-serif);font-size:16px}.ring small{font-size:8px}.round-button{width:47px;height:47px;border:0;border-radius:50%;background:var(--accent);color:#fff;font-size:20px}.page-section{padding:110px clamp(28px,6vw,90px)}.section-heading{display:flex;justify-content:space-between;align-items:end;gap:30px;margin-bottom:42px}.section-heading h2{margin:10px 0 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span{color:var(--part);font-size:14px}.modes-section{background:var(--surface-2)}.mode-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:16px;overflow:hidden}.mode-grid article{min-height:260px;padding:30px;background:var(--surface)}.mode-grid span{color:var(--accent);font-family:var(--font-serif);font-size:20px}.mode-grid h3{margin:65px 0 12px;font-family:var(--font-serif);font-size:30px;font-weight:500}.mode-grid p{color:var(--muted);font-size:11px;line-height:1.6}.quote-section{position:relative;min-height:360px;display:grid;place-items:center;text-align:center;overflow:hidden}.giant-quote{position:absolute;top:35px;left:50%;transform:translate(-50%);color:var(--accent-soft);font-family:var(--font-serif);font-size:240px;line-height:1}.quote-section blockquote{position:relative;max-width:800px;margin:0;font-family:var(--font-serif);font-size:clamp(35px,4.5vw,60px);line-height:1.05;letter-spacing:-.025em}.quote-section p{color:var(--muted);font-size:9px;text-transform:uppercase;letter-spacing:.12em}.lecture-progress-line{position:fixed;top:66px;z-index:21;height:3px;transition:width .4s}.lecture-hero{--part: var(--accent);position:relative;padding:78px clamp(28px,7vw,110px) 56px;overflow:hidden;border-bottom:1px solid var(--line)}.lecture-hero:after{content:"";position:absolute;right:-65px;top:-95px;width:330px;height:330px;border:1px solid color-mix(in srgb,var(--part) 32%,transparent);border-radius:50%;box-shadow:0 0 0 55px color-mix(in srgb,var(--part) 8%,transparent),0 0 0 110px color-mix(in srgb,var(--part) 5%,transparent)}.lecture-breadcrumb{position:relative;z-index:2;color:var(--part);font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.13em}.lecture-breadcrumb span{margin:0 8px}.lecture-index{margin-top:36px;color:var(--part);font-family:var(--font-serif);font-size:22px}.lecture-hero h1{position:relative;z-index:2;max-width:960px;margin:9px 0 8px;font-family:var(--font-serif);font-size:clamp(54px,7vw,92px);line-height:.9;letter-spacing:-.045em;font-weight:500}.lecture-subtitle{position:relative;z-index:2;color:var(--ink-soft);font-family:var(--font-serif);font-size:20px}.lecture-tags{display:flex;flex-wrap:wrap;gap:7px;margin-top:25px}.pill{display:inline-flex;padding:6px 9px;border:1px solid var(--line);border-radius:999px;color:var(--muted);background:color-mix(in srgb,var(--surface) 55%,transparent);font-size:9px}.lecture-actions{position:absolute;z-index:3;right:clamp(28px,7vw,110px);bottom:55px;display:flex;gap:8px}.action-button{height:35px;padding:0 12px;border:1px solid var(--line);border-radius:9px;background:var(--surface);color:var(--muted);font-size:10px}.action-button.active{color:var(--accent);border-color:var(--accent);background:var(--accent-soft)}.listen-bar{margin:22px clamp(28px,7vw,110px) 0;padding:13px 16px;display:flex;align-items:center;gap:15px;border:1px solid var(--line);border-radius:12px;background:var(--surface);box-shadow:var(--shadow)}.listen-main{padding:0;border:0;background:transparent;display:flex;align-items:center;gap:12px;text-align:left}.listen-main>span{display:grid;place-items:center;width:36px;height:36px;border-radius:50%;background:var(--ink);color:var(--surface);font-size:11px}.listen-main div{display:flex;flex-direction:column}.listen-main b{font-size:11px}.listen-main small{margin-top:2px;color:var(--muted);font-size:9px}.listen-bar label{margin-left:auto;display:flex;align-items:center;gap:7px;color:var(--muted);font-size:9px;text-transform:uppercase;letter-spacing:.08em}.listen-bar select{padding:6px 25px 6px 8px;border:1px solid var(--line);border-radius:7px;background:var(--paper);color:var(--ink);font-size:10px}.stop-button{border:0;background:transparent;color:var(--accent);font-size:10px}.lecture-layout{display:grid;grid-template-columns:minmax(0,730px) 230px;justify-content:center;gap:80px;padding:75px clamp(28px,6vw,90px) 95px}.lecture-content{font-size:calc(1rem * var(--text-scale))}.standfirst{margin-bottom:36px;font-family:var(--font-serif);font-size:calc(29px * var(--text-scale));line-height:1.35;color:var(--ink-soft)}.objectives{padding:25px 28px;background:var(--surface-2);border-left:3px solid var(--accent);border-radius:0 12px 12px 0}.objectives ol{margin:18px 0 0;padding-left:23px;display:grid;gap:9px}.objectives li{padding-left:7px;color:var(--ink-soft);font-family:var(--font-serif);font-size:calc(16px * var(--text-scale));line-height:1.45}.prose-section{position:relative;padding-top:66px}.section-number{display:block;color:var(--accent);font-family:var(--font-serif);font-size:16px}.prose-section h2{margin:10px 0 22px;font-family:var(--font-serif);font-size:calc(41px * var(--text-scale));line-height:1;letter-spacing:-.025em;font-weight:500}.prose-section p{color:var(--ink-soft);font-family:var(--font-serif);font-size:calc(19px * var(--text-scale));line-height:1.72}.prose-section p:first-letter{font-size:1.05em}.worked-example{margin-top:70px;padding:32px;border-radius:14px;background:#11233f;color:#f8f4ec}:root[data-theme=dark] .worked-example{background:#090f1a}.example-label{display:flex;justify-content:space-between;color:#f18b6f;font-size:9px;font-weight:700;text-transform:uppercase;letter-spacing:.1em}.example-label i{color:#f8f4ec80;font-style:normal}.worked-example h2{margin:24px 0 12px;font-family:var(--font-serif);font-size:calc(33px * var(--text-scale));font-weight:500}.worked-example p,.worked-example li{color:#f8f4ecc2;font-family:var(--font-serif);font-size:calc(16px * var(--text-scale));line-height:1.55}.worked-example ol{padding-left:22px;display:grid;gap:8px}.example-conclusion{margin:20px 0 0;padding-top:18px;border-top:1px solid rgba(255,255,255,.14)}.reflection{margin:70px 0;padding:0 10%;text-align:center}.reflection span{color:var(--accent);font-size:9px;font-weight:700;text-transform:uppercase;letter-spacing:.13em}.reflection blockquote{margin:18px 0 0;font-family:var(--font-serif);font-size:calc(29px * var(--text-scale));line-height:1.22;font-style:italic}.quiz{margin-top:70px;padding:30px}.quiz-head{display:flex;justify-content:space-between;align-items:start;padding-bottom:22px;border-bottom:1px solid var(--line)}.quiz-head h2{margin:8px 0 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