:root{--ink:#1b2430;--ink-soft:#3d4b5c;--paper:#f3efe6;--card:#fffdf8;--line:#d9d0c1;--copper:#9a4e24;--copper-dark:#6e3416;--pine:#1f4d45;--pine-soft:#e5f0ed;--flag:#8a3b2a;--flag-soft:#f8ebe6;--ok:#1d6b45;--bad:#8d2d2d;--shadow:0 10px 30px rgba(27,36,48,0.06);--max:1080px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);background:radial-gradient(1200px 400px at 10% -10%,#efe4d2 0,transparent 50%),var(--paper);font-family:Segoe UI,Avenir Next,Trebuchet MS,sans-serif;line-height:1.55}a{color:var(--copper-dark)}h1,h2,h3{line-height:1.2;font-weight:650}p{margin:.6rem 0}.skip{position:absolute;left:-999px;top:0}.skip:focus{left:1rem;background:white;padding:.5rem;z-index:5}.site-header{display:flex;justify-content:space-between;gap:1rem;align-items:center;flex-wrap:wrap;padding:.9rem 1.25rem;border-bottom:1px solid var(--line);background:rgba(255,253,248,.92);z-index:4}.brand{text-decoration:none;color:var(--ink)}.brand strong{display:block;letter-spacing:.08em;font-size:.78rem;text-transform:uppercase;color:var(--copper)}.brand span{font-size:.95rem}.header-links{display:flex;gap:1rem;flex-wrap:wrap}.header-links a{text-decoration:none;font-weight:600}.wrap{max-width:var(--max);margin:0 auto;padding:1.25rem}.hero{display:grid;grid-gap:1rem;gap:1rem;padding:1.5rem 0 .5rem}.kicker{color:var(--copper);font-weight:700;letter-spacing:.06em;text-transform:uppercase;font-size:.78rem}.lede{font-size:1.15rem;max-width:46rem}.grid-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));grid-gap:1rem;gap:1rem}.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:1rem 1.1rem;box-shadow:var(--shadow)}.card h2{margin-top:.2rem}.meta{color:var(--ink-soft);font-size:.92rem}.day-list{list-style:none;padding:0;margin:0;display:grid;grid-gap:.75rem;gap:.75rem}.day-list a{display:grid;grid-template-columns:auto 1fr auto;grid-gap:.8rem;gap:.8rem;align-items:center;text-decoration:none;color:inherit;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:.9rem 1rem}.day-num{width:2.4rem;height:2.4rem;border-radius:50%;display:grid;place-items:center;background:var(--pine);color:white}.day-num,.pill{font-weight:700}.pill{display:inline-block;border-radius:999px;padding:.1rem .55rem;font-size:.75rem;background:var(--pine-soft);color:var(--pine)}.pill.l2{background:#f3e6d4;color:var(--copper-dark)}.pill.l3{background:#eceaf4;color:#3d3560}.pill.flag{background:var(--flag-soft);color:var(--flag)}.lesson-layout{display:grid;grid-template-columns:240px 1fr;grid-gap:1.25rem;gap:1.25rem;align-items:start}.rail{position:-webkit-sticky;position:sticky;top:4.5rem;display:grid;grid-gap:.35rem;gap:.35rem;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:.8rem}.rail a{text-decoration:none;color:var(--ink);font-size:.88rem;display:flex;justify-content:space-between;gap:.4rem}.rail .mins{color:var(--ink-soft)}.section{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:1rem 1.1rem 1.2rem;margin-bottom:.9rem}.section header{display:flex;justify-content:space-between;gap:.6rem;align-items:baseline;flex-wrap:wrap}.section ol,.section ul,.steps{padding-left:1.2rem}.callout{border-left:4px solid var(--copper);background:#fbf6ef;padding:.7rem .8rem;border-radius:8px;margin:.8rem 0}.callout.flag{border-color:var(--flag);background:var(--flag-soft)}.callout.pm{border-color:var(--pine);background:var(--pine-soft)}.callout.advanced{border-color:#5c5480;background:#f4f2f8}.formula{font-family:inherit;background:#f7f4ee;border-radius:8px;padding:.7rem .8rem}.formula strong{display:block}.video-frame{margin:.8rem 0 .2rem}.video-aspect{position:relative;width:100%;aspect-ratio:16/9;background:#101820;border-radius:12px;overflow:hidden}.video-aspect iframe{position:absolute;inset:0;width:100%;height:100%;border:0}.video-caption{color:var(--ink-soft);font-size:.92rem}.choices{display:grid;grid-gap:.45rem;gap:.45rem;margin:.6rem 0}.choices label{display:flex;gap:.55rem;align-items:flex-start;border:1px solid var(--line);border-radius:10px;padding:.55rem .65rem;background:white}.choices label.good{border-color:var(--ok);background:#eef8f2}.choices label.bad{border-color:var(--bad);background:#fdeeee}.button,button{background:var(--copper);color:white;border:0;border-radius:999px;padding:.55rem .95rem;font-weight:700;cursor:pointer}button.secondary{background:transparent;color:var(--ink);border:1px solid var(--line)}button:disabled{opacity:.6;cursor:not-allowed}.score{font-weight:700}.explain{color:var(--ink-soft);margin:.2rem 0 .8rem .2rem}.row{display:flex;gap:.5rem;flex-wrap:wrap;align-items:center}input[type=number]{font:inherit;padding:.45rem .55rem;border-radius:8px;border:1px solid var(--line);width:8rem}.progress-track{height:8px;background:#e6e0d4;border-radius:99px;overflow:hidden}.progress-track span{display:block;height:100%;background:var(--pine)}footer.site{color:var(--ink-soft);padding:2rem 1.25rem 3rem;max-width:var(--max);margin:0 auto;font-size:.9rem}.terms{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));grid-gap:.55rem;gap:.55rem;margin:.6rem 0}.terms div{background:var(--pine-soft);border-radius:10px;padding:.55rem .7rem}.terms dt{font-weight:700}.terms dd{margin:.15rem 0 0;color:var(--ink-soft)}.diagram{margin:.6rem 0}.diagram svg{width:100%;height:auto;display:block;background:#f7f4ee;border-radius:12px}.duty-phone text,.symbols-phone text{font-size:22px}.sheet-wrap{overflow-x:auto;margin:.6rem 0}.sheet{width:100%;border-collapse:collapse;background:#f7f4ee;font-size:.95rem}.sheet caption{text-align:left;font-weight:700;padding:.35rem .2rem .5rem}.sheet td,.sheet th{border:1px solid var(--line);padding:.45rem .55rem;text-align:left;vertical-align:top}.sheet th{background:var(--pine-soft)}.lesson-fold,.sources{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:.6rem .8rem;margin:.6rem 0 .9rem}.lesson-fold summary,.sources summary{cursor:pointer;font-weight:700}.phone-only{display:none}.desktop-only{display:block}@media (max-width:800px){.phone-only{display:block}.desktop-only{display:none}.lesson-layout{grid-template-columns:1fr}.rail{position:static}.site-header{flex-direction:column;align-items:flex-start}.day-list a{grid-template-columns:auto 1fr}.day-list a .mins{grid-column:2}}:root{color-scheme:light;--book-paper:#f6f7f9;--book-surface:#ffffff;--book-raised:#f0f3f5;--book-ink:#172124;--book-muted:#59676e;--book-line:#dce3e7;--book-accent:#12664f;--book-accent-hover:#0b4c3c;--book-tint:#eaf4ef;--book-warning:#fbf4e8;--book-warning-ink:#79551b;--book-danger:#faeeee;--book-shadow:0 12px 36px #1423260a;--reader-size:19px;--reader-font:var(--ui-font);--ui-font:-apple-system,BlinkMacSystemFont,system-ui,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;--ink:var(--book-ink);--ink-soft:var(--book-muted);--paper:var(--book-paper);--card:var(--book-surface);--line:var(--book-line);--pine:var(--book-accent);--pine-soft:var(--book-tint);--copper:var(--book-accent);--copper-dark:var(--book-accent)}html[data-theme=dark]{color-scheme:dark;--book-paper:#0f1316;--book-surface:#181e22;--book-raised:#222a2f;--book-ink:#e7edef;--book-muted:#a3b1b8;--book-line:#344047;--book-accent:#8bd4b5;--book-accent-hover:#afe5ce;--book-tint:#20392e;--book-warning:#332b1d;--book-warning-ink:#ebcb8e;--book-danger:#3d2729;--book-shadow:0 12px 36px #0003}html[data-font=literary]{--reader-font:Palatino,"Palatino Linotype","Book Antiqua",Georgia,serif}html[data-font=classic]{--reader-font:Georgia,"Times New Roman",serif}html[data-font=sans]{--reader-font:var(--ui-font)}html[data-font=mono]{--reader-font:"SFMono-Regular",Consolas,"Liberation Mono",monospace}body{color:var(--book-ink);background:var(--book-paper);font-family:var(--ui-font);-webkit-font-smoothing:antialiased;font-optical-sizing:auto}a{color:var(--book-accent);text-underline-offset:4px}button,input,select,textarea{font-family:inherit}button{border-radius:8px}::selection{background:var(--book-accent);color:var(--book-paper)}.skip:focus{background:var(--book-surface);color:var(--book-ink);z-index:100}.site-header{position:-webkit-sticky;position:sticky;top:0;z-index:60;padding:16px max(24px,calc((100vw - 1320px)/2));border-bottom:1px solid var(--book-line);gap:24px;flex-wrap:nowrap}.brand{display:flex;align-items:center;gap:12px;flex-shrink:0;color:var(--book-ink)}.brand .brand-mark{display:grid;place-items:center;width:38px;height:38px;border:1px solid var(--book-line);border-radius:10px;color:var(--book-accent)}.brand-mark svg{width:26px;height:26px}.brand-copy strong{font-size:10px;letter-spacing:.2em;color:var(--book-muted);margin-bottom:2px}.brand .brand-copy>span{font-size:13px;letter-spacing:-.02em;font-weight:650}.header-links{gap:24px;font-size:12px}.header-links a{color:var(--book-muted);font-weight:550}.header-links a:hover{color:var(--book-ink)}.header-actions{display:flex;align-items:center;gap:18px;margin-left:auto}.eyebrow{font-family:var(--ui-font);text-transform:uppercase;letter-spacing:.16em;font-size:10px;font-weight:650;color:var(--book-accent);line-height:1.7}.book-home{max-width:1280px;margin:auto;padding:0 40px}.book-hero{display:grid;grid-template-columns:minmax(0,1.65fr) minmax(310px,1fr);align-items:center;grid-gap:64px;gap:64px;padding:88px 0 72px}.hero-copy h1{font-family:var(--ui-font);font-size:clamp(40px,5.1vw,68px);font-weight:650;letter-spacing:-.065em;line-height:1.08;margin:24px 0}.hero-copy h1 em{font-style:normal;color:var(--book-accent);font-weight:650}.hero-description{max-width:570px;font-size:17px;line-height:1.8;color:var(--book-muted)}.hero-meta{display:flex;flex-wrap:wrap;gap:10px 20px;margin-top:28px;color:var(--book-muted)}.hero-meta span{display:inline-flex;align-items:center;gap:8px}.hero-meta span:before{content:"";width:4px;height:4px;border-radius:50%;background:var(--book-accent)}.start-panel{border:1px solid var(--book-line);position:relative;overflow:hidden}.start-panel:before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:var(--book-accent)}.start-panel h2{font-family:var(--ui-font);font-size:24px;letter-spacing:-.04em;line-height:1.2;font-weight:600;margin:20px 0 32px}.course-progress>div{display:flex;justify-content:space-between;gap:12px;font-size:12px;color:var(--book-muted)}.course-progress progress{display:block;-webkit-appearance:none;-moz-appearance:none;appearance:none;width:100%;height:5px;border:0;border-radius:8px;overflow:hidden;margin:16px 0 28px;background:var(--book-raised);accent-color:var(--book-accent)}.course-progress progress::-webkit-progress-bar{background:var(--book-raised)}.course-progress progress::-webkit-progress-value{background:var(--book-accent);border-radius:8px}.course-progress progress::-moz-progress-bar{background:var(--book-accent);border-radius:8px}.course-progress>.book-primary{width:100%;justify-content:space-between}.course-progress>p{font-size:11px;line-height:1.7;margin:16px 0 0;color:var(--book-muted)}.book-primary,.book-secondary{font-family:var(--ui-font);font-size:12px;font-weight:600;padding:11px 16px;border-radius:8px;display:inline-flex;align-items:center;justify-content:center;gap:18px;text-decoration:none;line-height:1.5;transition:background .15s,border-color .15s}.book-primary{background:var(--book-accent);color:var(--book-surface);border:1px solid var(--book-accent)}.book-primary:hover{background:var(--book-accent-hover);border-color:var(--book-accent-hover)}.book-secondary{background:var(--book-surface);color:var(--book-ink);border:1px solid var(--book-line)}.book-secondary:hover{background:var(--book-raised)}.book-home h2{font-family:var(--ui-font);font-size:30px;line-height:1.22;letter-spacing:-.045em;font-weight:600}.course-orientation{display:grid;grid-template-columns:1fr 1.55fr;grid-gap:72px;gap:72px;border-top:1px solid var(--book-line);padding:52px 0}.course-orientation p:not(.eyebrow){font-size:14px;line-height:1.9;color:var(--book-muted)}.orientation-links{display:flex;flex-wrap:wrap;gap:24px;padding-top:16px}.orientation-links a{font-size:12px;text-decoration:none;font-weight:600}.process-intro{border-top:1px solid var(--book-line);padding:52px 0}.process-intro>p:not(.eyebrow){color:var(--book-muted);max-width:730px;font-size:14px;line-height:1.8}.energy-explorer{margin-top:28px}.energy-tabs{display:grid;grid-template-columns:repeat(5,1fr);border:1px solid var(--book-line);border-radius:12px;overflow:hidden;background:var(--book-surface)}.energy-tabs button{background:transparent;color:var(--book-ink);border-radius:0;border-right:1px solid var(--book-line);padding:24px 18px;text-align:left;font-weight:400}.energy-tabs button:last-child{border-right:0}.energy-tabs button[aria-pressed=true]{background:var(--book-tint);box-shadow:inset 0 -3px var(--book-accent)}.energy-tabs span{display:block;font-size:10px;color:var(--book-muted);margin-bottom:22px}.energy-tabs strong{display:block;font-size:13px;margin-bottom:7px}.energy-tabs small{font-size:11px;color:var(--book-muted)}.energy-detail{display:grid;grid-template-columns:2fr 1fr;align-items:center;grid-gap:32px;gap:32px;padding:24px 0;border-bottom:1px solid var(--book-line);min-height:124px;font-size:14px;line-height:1.8}.energy-detail a{text-align:right;font-size:12px;font-weight:600;text-decoration:none}.energy-caption{font-size:11px;color:var(--book-muted);margin-top:14px}.catalog{padding:52px 0}.catalog-head{display:flex;justify-content:space-between;align-items:flex-end;gap:36px}.catalog-head h2{max-width:540px;margin-bottom:12px}.catalog-search{min-width:280px}.catalog-search label,.setting-label{display:block;font-size:11px;font-weight:600;color:var(--book-muted);margin-bottom:8px}.catalog-search input,.glossary-search{font:inherit;font-size:13px;border:1px solid var(--book-line);border-radius:8px;background:var(--book-surface);color:var(--book-ink);padding:13px 16px;width:100%}.search-count{font-size:11px;color:var(--book-muted);margin-top:18px}.catalog-unit{margin-top:36px}.catalog-unit h3{font-size:11px;text-transform:uppercase;letter-spacing:.13em;color:var(--book-muted);margin:0 0 16px}.catalog-unit ol{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));grid-gap:14px;gap:14px}.catalog-unit li{border:1px solid var(--book-line);background:var(--book-surface);overflow:hidden}.catalog-unit li>a{display:grid;grid-template-columns:38px minmax(0,1fr) 18px;grid-gap:18px;gap:18px;text-decoration:none;align-items:start;height:100%;color:var(--book-ink);transition:background .15s}.catalog-unit li>a:hover{background:var(--book-raised)}.chapter-number{font-size:22px;font-weight:500;letter-spacing:-.05em;color:var(--book-muted);line-height:1.4}.catalog-unit strong{font-size:14px;font-weight:600;line-height:1.5}.chapter-description{display:block;font-size:12px;color:var(--book-muted);line-height:1.8;margin-top:8px}.catalog-card-meta{display:block;font-size:10px;margin-top:20px;font-weight:500}.chapter-open{font-size:18px;line-height:1.6}.catalog-completed .catalog-card-meta,.catalog-completed .chapter-number,.chapter-open{color:var(--book-accent)}.study-plan{padding:36px;background:var(--book-tint);border:1px solid var(--book-line);border-radius:14px;margin:28px 0}.study-plan p:not(.eyebrow){font-size:14px;line-height:1.9;color:var(--book-muted);max-width:850px}.course-reference-links{display:flex;flex-wrap:wrap;gap:24px;padding:28px 0;font-size:11px}.course-reference-links a{text-decoration:none}.book-shell{max-width:1360px;margin:auto;display:grid;grid-template-columns:250px minmax(0,1fr);grid-gap:0 48px;gap:0 48px;padding:28px 32px 64px;align-items:start}.navigation-toggle{grid-column:1/-1;display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:24px}.navigation-toggle .book-secondary{font-size:11px;padding:8px 12px}.reader-breadcrumb{display:flex;align-items:center;color:var(--book-muted)}.reader-breadcrumb a{color:var(--book-muted);text-decoration:none}.book-sidebar{position:-webkit-sticky;position:sticky;max-height:calc(100dvh - 132px);overflow:auto;font-size:12px;scrollbar-width:thin;padding:12px 12px 16px 0}.book-sidebar[hidden]{display:none}.book-sidebar a{color:var(--book-muted);text-decoration:none}.book-back{display:block;margin:0 0 28px;font-size:11px}.book-sidebar summary{cursor:pointer;letter-spacing:.08em;text-transform:uppercase}.book-sidebar ol{list-style:none;padding:0;margin:16px 0 24px}.book-sidebar li a{display:grid;grid-template-columns:24px 1fr;grid-gap:10px;gap:10px;border-radius:7px;line-height:1.55;margin:3px 0}.book-sidebar li a>span:first-child{font-size:10px;color:var(--book-muted)}.book-sidebar li a:hover{background:var(--book-raised);color:var(--book-ink)}.book-sidebar li a[aria-current=page]{background:var(--book-surface);color:var(--book-ink);font-weight:600;box-shadow:inset 3px 0 var(--book-accent)}.book-sidebar li a.chapter-done{color:var(--book-accent)}.book-sidebar li a.chapter-done>span:first-child{color:var(--book-accent);font-weight:700;font-size:14px}.book-sidebar li a.chapter-done[aria-current=page]{background:var(--book-tint)}.book-sidebar>a:not(.book-back){display:block;padding:10px;font-size:11px}.book-reader{min-width:0;background:var(--book-surface);border:1px solid var(--book-line);border-radius:14px;padding:40px 44px}.book-shell.navigation-collapsed{max-width:1100px}.book-shell.navigation-collapsed .book-reader{width:100%}.chapter-header{padding:0 0 28px;border-bottom:1px solid var(--book-line)}.chapter-counter{font-size:11px;margin:20px 0}.chapter-header h1{font-family:var(--ui-font);font-size:clamp(32px,3.2vw,46px);letter-spacing:-.05em;font-weight:600;line-height:1.16;max-width:750px;margin:18px 0}.chapter-header>.chapter-description{font-size:15px;line-height:1.8;max-width:660px}.chapter-question{font-family:var(--reader-font);font-size:calc(var(--reader-size) + 2px);line-height:1.6;color:var(--book-accent);margin:28px 0}.reading-tools{display:flex;gap:8px;align-items:center;flex-wrap:wrap}.reading-tools button{padding:9px 12px}.reading-tools span{width:100%;font-size:10px;color:var(--book-muted);margin-top:4px}.chapter-roadmap{border:1px solid var(--book-line);border-radius:8px;background:var(--book-raised);padding:16px 20px;margin:24px 0 40px;font-size:13px;line-height:1.8}.chapter-roadmap summary{cursor:pointer;font-weight:600}.chapter-roadmap nav{display:grid;grid-gap:8px;gap:8px;padding:12px 0}.reading-section{scroll-margin-top:112px;margin:48px 0 56px}.section-number{font-family:var(--ui-font);font-size:10px;letter-spacing:.15em;color:var(--book-accent)}.book-reader h2,.reading-section h2{font-family:var(--reader-font);font-size:calc(var(--reader-size) * 1.5);line-height:1.32;font-weight:500;letter-spacing:-.025em;margin:12px 0 24px}.reading-section>p:not(.section-number){color:var(--book-ink);margin:24px 0;max-width:76ch}.reading-section>ol,.reading-section>p:not(.section-number),.reading-section>ul{font-family:var(--reader-font);font-size:var(--reader-size);line-height:1.9}.book-reader h3{font-size:calc(var(--reader-size) * .9);line-height:1.5}.book-note{margin:28px 0;padding:22px 24px;border-left:3px solid var(--book-accent);border-radius:0 8px 8px 0;background:var(--book-tint)}.book-note h3{font-family:var(--ui-font);font-size:13px;margin:0 0 10px;font-weight:600}.book-note p{font-family:var(--reader-font);font-size:calc(var(--reader-size) * .93);line-height:1.85;margin:0}.book-note.advanced{background:var(--book-warning);border-color:var(--book-warning-ink)}.book-formula{margin:28px 0;padding:24px;border:1px solid var(--book-line);border-radius:8px;background:var(--book-raised)}.book-formula figcaption{font-size:10px;font-weight:600;text-transform:uppercase;letter-spacing:.1em;color:var(--book-muted)}.book-formula>div{font-family:var(--reader-font);font-size:calc(var(--reader-size) * 1.2);margin:16px 0;overflow-wrap:anywhere}.book-formula>p{font-family:var(--reader-font);font-size:calc(var(--reader-size) * .86);line-height:1.8;color:var(--book-muted)}.book-table-scroll{overflow-x:auto;margin:28px 0}.book-table{width:100%;border-collapse:collapse;font-size:calc(var(--reader-size) * .8);line-height:1.7}.book-table caption{text-align:left;font-weight:600;margin-bottom:14px}.book-table th{background:var(--book-raised);font-weight:600}.book-table td,.book-table th{border:1px solid var(--book-line);padding:14px;text-align:left;vertical-align:top}.book-video{margin:36px 0;border:1px solid var(--book-line);border-radius:12px;background:var(--book-surface);overflow:hidden}.video-heading{padding:22px 24px 0}.video-heading h3{font-family:var(--ui-font);font-size:15px;line-height:1.5;margin:8px 0;font-weight:600}.video-heading>span:last-child{font-size:11px;color:var(--book-muted)}.video-inner{padding:0 24px 24px}.video-inner p{font-size:13px;line-height:1.85;margin:16px 0}.video-aspect{border-radius:8px}.video-correction{padding:14px 16px;border-left:3px solid var(--book-warning-ink);background:var(--book-warning)}.video-context{color:var(--book-muted)}.video-check{margin:20px 0;padding:18px;background:var(--book-tint);border-radius:8px}.video-check>p{margin-top:0}.video-check summary{padding:4px 0;cursor:pointer;font-size:12px;color:var(--book-accent);font-weight:600}.chapter-summary{padding:28px;margin:48px 0;background:var(--book-tint);border:1px solid var(--book-line);border-radius:10px;scroll-margin-top:112px}.chapter-summary li{font-family:var(--reader-font);font-size:calc(var(--reader-size) * .93);line-height:1.8;margin:12px 0}.chapter-summary dl{border-top:1px solid var(--book-line);margin-top:24px}.chapter-summary dl>div{display:grid;grid-template-columns:1fr 2fr;grid-gap:16px;gap:16px;padding:14px 0;border-bottom:1px solid var(--book-line);font-family:var(--reader-font);font-size:calc(var(--reader-size) * .86);line-height:1.75}.chapter-summary dt{font-weight:600}.chapter-summary dd{margin:0;color:var(--book-muted)}.notebook{padding:32px 0;margin:48px 0;border-top:1px solid var(--book-line);scroll-margin-top:112px}.notebook>p:not(.eyebrow){font-family:var(--reader-font);font-size:var(--reader-size);line-height:1.85}.notebook label{display:block;font-size:12px;font-weight:600;margin:24px 0 10px}.notebook textarea{display:block;resize:vertical;width:100%;font-family:var(--reader-font);font-size:var(--reader-size);line-height:1.8;color:var(--book-ink);background:var(--book-paper);border:1px solid var(--book-line);border-radius:8px;padding:18px}.notebook-actions{display:flex;align-items:center;flex-wrap:wrap;gap:16px;margin:16px 0}.notebook-actions span{font-size:11px;color:var(--book-muted)}.notebook details{margin:24px 0;font-size:calc(var(--reader-size) * .9);line-height:1.8}.notebook summary{cursor:pointer;font-size:13px;color:var(--book-accent);font-weight:600}.book-review{padding:32px 0;border-top:1px solid var(--book-line);scroll-margin-top:112px}.book-review>p:not(.eyebrow){color:var(--book-muted);font-size:13px;line-height:1.85}.book-review fieldset{min-width:0;padding:0;border:0;margin:32px 0}.book-review legend{font-size:var(--reader-size);font-weight:600;margin-bottom:12px}.book-review label,.book-review legend{font-family:var(--reader-font);line-height:1.7}.book-review label{display:flex;gap:12px;border:1px solid var(--book-line);border-radius:8px;padding:16px;margin:8px 0;background:var(--book-surface);font-size:calc(var(--reader-size) * .9);cursor:pointer}.book-review input{flex-shrink:0;margin-top:6px;accent-color:var(--book-accent)}.book-review label.review-correct{background:var(--book-tint);border-color:var(--book-accent)}.book-review label.review-incorrect{background:var(--book-danger);border-color:#b36f6f}.review-explanation{padding:18px;background:var(--book-raised);border-radius:8px;font-family:var(--reader-font);font-size:calc(var(--reader-size) * .88);line-height:1.8}.review-explanation a{display:block;margin-top:10px}.review-actions{display:flex;gap:10px;flex-wrap:wrap}.chapter-sources{margin:28px 0;border:1px solid var(--book-line);border-radius:8px;padding:18px 20px;font-size:12px;line-height:1.8}.chapter-sources summary{cursor:pointer;font-weight:600}.chapter-sources li{margin:16px 0}.chapter-sources li p{color:var(--book-muted)}.chapter-completion{padding:24px 0 0;border-top:1px solid var(--book-line);margin-top:32px}.chapter-completion p,.chapter-completion span{color:var(--book-muted);font-size:12px;line-height:1.8}.chapter-completion button{margin:12px 0}.chapter-completion span{display:block}.chapter-pagination{display:grid;grid-template-columns:1fr 1fr;grid-gap:20px;gap:20px;border-top:1px solid var(--book-line);padding-top:28px;margin-top:36px}.chapter-pagination a{text-decoration:none;border:1px solid var(--book-line);border-radius:10px;padding:20px;background:var(--book-raised)}.chapter-pagination a:hover{background:var(--book-tint)}.chapter-pagination span{display:block;font-size:10px;color:var(--book-muted);margin-bottom:10px}.chapter-pagination strong{display:block;font-size:14px;font-weight:600;line-height:1.5}.chapter-pagination a:last-child{text-align:right}.book-resource{max-width:960px;margin:auto;padding:56px 32px;color:var(--book-ink)}.book-resource>h1{font-family:var(--ui-font);font-size:44px;line-height:1.2;letter-spacing:-.05em;font-weight:600}.book-resource>h2{font-size:26px;letter-spacing:-.03em;margin-top:40px}.book-resource>p{font-size:15px;line-height:1.9;color:var(--book-muted)}.book-resource>.eyebrow{font-size:10px;margin-top:28px}.glossary-search{margin-top:12px}.glossary-list{margin-top:28px}.glossary-list>div{border-bottom:1px solid var(--book-line);padding:24px 0}.glossary-list dt{font-family:var(--reader-font);font-size:calc(var(--reader-size) * 1.2);margin-bottom:8px}.glossary-list dd{margin:0;line-height:1.8;font-size:var(--reader-size);font-family:var(--reader-font)}.glossary-list dd a{font-family:var(--ui-font);font-size:12px}.evidence-videos section{border-bottom:1px solid var(--book-line);padding:24px 0}.evidence-videos h3{font-size:15px}.evidence-videos p{font-size:13px;line-height:1.85}.reference-list li{margin:24px 0;line-height:1.85;font-size:14px}.process-diagram{margin:32px 0}.book-reader .diagram svg,.process-diagram svg{display:block;width:100%;height:auto;background:#f4f6ef;border:1px solid var(--book-line);border-radius:8px}.book-reader .diagram{overflow-x:auto;margin:28px 0}.book-reader .diagram svg{min-width:600px}.book-reader .diagram figcaption,.process-diagram figcaption{font-size:12px;line-height:1.8;color:var(--book-muted);margin:14px 0}.process-diagram details{font-family:var(--reader-font);font-size:calc(var(--reader-size) * .9);line-height:1.85}.process-diagram summary{cursor:pointer;font-family:var(--ui-font);font-size:12px}.process-diagram li{margin:10px 0}.profile-controls{display:flex;align-items:center;gap:10px;font-size:12px;position:relative}.profile-controls>a{text-decoration:none;border:1px solid var(--book-line);border-radius:8px;padding:9px 14px}.profile-controls>a,.profile-name{font-weight:600;color:var(--book-ink)}.profile-menu summary{cursor:pointer;color:var(--book-muted);font-size:11px}.profile-menu>div{position:absolute;right:0;top:38px;width:290px;padding:20px;background:var(--book-surface);border:1px solid var(--book-line);border-radius:12px;box-shadow:var(--book-shadow);z-index:80}.profile-menu p{line-height:1.8;font-size:12px}.profile-menu button{display:block;width:100%;margin:10px 0;text-align:left}.save-status{font-size:11px;line-height:1.8;color:var(--book-muted);flex-basis:100%}.login-page{max-width:700px}.login-form{display:grid;grid-gap:12px;gap:12px;max-width:400px;margin:32px 0;padding:28px;border:1px solid var(--book-line);background:var(--book-surface);border-radius:14px}.login-form input,.login-form select{font:inherit;font-size:14px;color:var(--book-ink);background:var(--book-paper);padding:12px;border:1px solid var(--book-line);border-radius:8px;width:100%}.login-form label{font-size:12px;font-weight:600}.login-form button{margin-top:8px}.login-form [role=alert]{font-size:12px}.appearance-menu{position:relative;font-size:12px}.appearance-menu>summary{display:flex;align-items:center;gap:7px;cursor:pointer;list-style:none;color:var(--book-ink);padding:9px 10px;border-radius:8px}.appearance-menu>summary::-webkit-details-marker{display:none}.appearance-menu>summary:hover{background:var(--book-raised)}.appearance-glyph{font-family:Georgia,serif;font-size:17px;letter-spacing:-.08em}.appearance-panel{max-height:calc(100dvh - 112px);overflow:auto;position:absolute;right:0;top:42px;width:320px;padding:24px;border:1px solid var(--book-line);border-radius:14px;background:var(--book-surface);box-shadow:0 20px 64px #0002;z-index:90}.appearance-heading{padding-bottom:20px;border-bottom:1px solid var(--book-line)}.appearance-heading strong{display:block;font-size:16px;font-weight:600;letter-spacing:-.03em}.appearance-heading>span{display:block;font-size:11px;color:var(--book-muted);margin-top:4px}.appearance-panel fieldset{border:0;padding:0;margin:20px 0}.appearance-panel legend{font-size:11px;font-weight:600;color:var(--book-muted);margin-bottom:8px}.segmented{display:flex;border:1px solid var(--book-line);padding:4px;border-radius:8px;background:var(--book-paper);gap:4px}.segmented button{flex:1 1;color:var(--book-muted);background:transparent;border-radius:5px;padding:9px;font-size:12px;font-weight:500}.segmented button[aria-pressed=true]{background:var(--book-surface);color:var(--book-ink);box-shadow:0 1px 4px #0001}.reading-mode-switch{display:flex;align-items:center;justify-content:space-between;gap:12px;width:100%;background:transparent;color:var(--book-ink);padding:0;margin:20px 0;text-align:left}.reading-mode-switch strong{display:block;font-size:12px;font-weight:600}.reading-mode-switch small{display:block;font-size:10px;font-weight:400;color:var(--book-muted);margin-top:4px}.switch-track{width:34px;height:20px;border-radius:12px;background:var(--book-line);padding:3px;flex-shrink:0}.switch-track>span{display:block;width:14px;height:14px;border-radius:50%;background:var(--book-surface);transition:transform .15s}.reading-mode-switch[aria-pressed=true] .switch-track{background:var(--book-accent)}.reading-mode-switch[aria-pressed=true] .switch-track>span{transform:translateX(14px)}.appearance-panel select{width:100%;font:inherit;font-size:12px;color:var(--book-ink);background:var(--book-paper);border:1px solid var(--book-line);border-radius:7px;padding:11px}.font-size-heading{display:flex;align-items:center;justify-content:space-between;margin-top:20px}.font-size-heading .setting-label{margin-bottom:0}.font-size-heading output{font-size:11px;color:var(--book-muted);font-feature-settings:"tnum";font-variant-numeric:tabular-nums}.font-size-control{display:flex;align-items:center;gap:12px;margin-top:12px}.font-size-control button{background:var(--book-raised);color:var(--book-ink);font-size:12px;padding:8px;min-width:34px}.font-size-control input{width:100%;min-width:0;accent-color:var(--book-accent)}.font-preview{padding:16px;background:var(--book-paper);border-radius:8px;font-family:var(--reader-font);font-size:var(--reader-size);line-height:1.65;margin:20px 0}.appearance-footer{display:flex;align-items:center;justify-content:space-between;gap:10px;font-size:10px;color:var(--book-muted)}.appearance-footer button{background:transparent;color:var(--book-accent);font-size:10px;padding:0;font-weight:600}.appearance-error{color:var(--book-warning-ink);font-size:11px}html[data-reading=true] .book-shell{grid-template-columns:minmax(0,1fr);max-width:930px}html[data-reading=true] .book-reader{border-color:transparent;padding:44px 50px;box-shadow:0 4px 24px #00000004}html[data-reading=true] .book-sidebar{display:none}html[data-reading=true] .reading-section>p:not(.section-number){line-height:1.95;max-width:70ch}html[data-reading=true] .chapter-header h1{font-family:var(--reader-font);font-weight:500;letter-spacing:-.03em}html[data-reading=true] .book-home,html[data-reading=true] .book-resource{max-width:1080px}footer.site{max-width:1280px;margin:auto;padding:36px 40px 48px;border-top:1px solid var(--book-line);color:var(--book-muted);font-size:11px;line-height:1.9}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}[tabindex]:focus-visible,a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible,textarea:focus-visible{outline:2px solid var(--book-accent);outline-offset:4px}button:disabled,textarea:disabled{opacity:.55;cursor:not-allowed}.card,.lesson-fold,.rail,.section,.sources{background:var(--book-surface);border-color:var(--book-line)}.callout,.choices label,.formula,.sheet{background:var(--book-raised);color:var(--book-ink)}.callout.pm,.sheet th,.terms div{background:var(--book-tint)}.callout.advanced{background:var(--book-warning)}.choices label.good{background:var(--book-tint)}.choices label.bad{background:var(--book-danger)}@media(max-width:1100px){.book-hero{gap:36px;grid-template-columns:1.4fr 1fr}.book-shell{grid-template-columns:220px minmax(0,1fr);gap:0 28px}.book-reader{padding:32px}.header-links{gap:16px}.header-actions{gap:12px}.course-orientation{gap:40px}}@media(max-width:900px){.site-header{flex-direction:row;flex-wrap:wrap;gap:12px 20px;padding:14px 24px}.header-links{order:3;flex-basis:100%;font-size:11px;gap:24px}.book-sidebar{top:140px;max-height:calc(100dvh - 164px)}.book-hero{gap:28px}.start-panel{padding:26px}.catalog-unit li>a{padding:20px;gap:12px}.energy-tabs{grid-template-columns:repeat(3,1fr)}.energy-tabs button{border-bottom:1px solid var(--book-line)}.book-review,.chapter-summary,.notebook,.reading-section{scroll-margin-top:144px}}@media(max-width:760px){.book-home{padding:0 22px}.book-hero{grid-template-columns:1fr;padding:48px 0 36px;gap:32px}.hero-copy h1{font-size:44px}.hero-description{font-size:15px}.hero-meta{font-size:10px;gap:8px 14px}.start-panel{padding:28px}.course-orientation{grid-template-columns:1fr;gap:8px;padding:36px 0}.book-home h2{font-size:26px}.catalog,.process-intro{padding:36px 0}.energy-tabs{grid-template-columns:repeat(2,1fr)}.energy-tabs button{padding:18px 14px}.energy-detail{grid-template-columns:1fr;gap:8px}.energy-detail a{text-align:left}.catalog-head{display:block}.catalog-search{margin-top:24px;min-width:0}.catalog-unit ol{grid-template-columns:1fr}.catalog-unit li>a{padding:22px}.study-plan{padding:26px}.book-shell,.book-shell.navigation-collapsed{display:block;padding:20px 16px 36px}.book-sidebar,.navigation-toggle{margin-bottom:20px}.book-sidebar{position:static;max-height:none;padding:20px;background:var(--book-surface);border:1px solid var(--book-line);border-radius:10px}.book-back{margin-bottom:20px}.book-sidebar ol{max-height:240px;overflow:auto}.book-sidebar>a:not(.book-back){display:inline-block}.book-reader{padding:26px 22px;border-radius:10px}.chapter-header h1{font-size:32px}.chapter-counter{font-size:10px}.chapter-header>.chapter-description{font-size:14px}.book-reader h2,.reading-section h2{font-size:calc(var(--reader-size) * 1.35)}.reading-section{margin:36px 0 44px}.chapter-summary{padding:22px}.chapter-summary dl>div{grid-template-columns:1fr;gap:4px}.book-formula,.book-note{padding:20px}.video-heading{padding:20px 18px 0}.video-inner{padding:0 18px 18px}.book-table td,.book-table th{padding:10px}.chapter-pagination{gap:12px}.chapter-pagination a{padding:14px}.chapter-pagination strong{font-size:12px}.book-resource{padding:36px 22px}.book-resource>h1{font-size:34px}html[data-reading=true] .book-reader{padding:26px 20px}footer.site{padding:28px 22px}}@media(max-width:540px){.site-header{padding:12px 18px;gap:12px}.brand .brand-mark{width:30px;height:30px;border-radius:8px}.brand-mark svg{width:22px;height:22px}.brand{gap:8px}.brand .brand-copy>span{font-size:11px}.brand-copy strong{font-size:8px}.header-actions{gap:6px}.appearance-menu>summary{padding:8px;font-size:11px}.appearance-menu>summary>span:last-child{display:none}.profile-name{font-size:11px}.profile-menu summary{font-size:10px}.profile-controls>a{font-size:11px;padding:7px 10px}.appearance-panel{max-height:calc(100dvh - 120px);overflow:auto}.appearance-panel,.profile-menu>div{position:fixed;left:16px;right:16px;top:100px;width:auto}.process-diagram svg{display:none}.process-diagram details{border-left:2px solid var(--book-accent);padding-left:16px}.process-diagram details>summary{display:none}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,:after,:before{transition:none!important}}@media print{:root,html[data-reading=true][data-theme=dark],html[data-theme=dark]{--book-paper:white;--book-surface:white;--book-ink:black;--book-muted:#333;--book-line:#ccc;--book-accent:#222;--book-tint:#f5f5f5;--book-raised:#f5f5f5;--book-warning:#f5f5f5}body{background:white;color:black}.book-sidebar,.book-video,.chapter-completion,.chapter-pagination,.chapter-roadmap,.chapter-sources,.course-reference-links,.navigation-toggle,.reading-tools,.site-header,footer.site{display:none!important}.book-resource,.book-shell,.book-shell.navigation-collapsed,html[data-reading=true] .book-shell{display:block;max-width:none;padding:0;margin:0}.book-reader,html[data-reading=true] .book-reader{width:100%;border:0;padding:0;box-shadow:none}.reading-section{margin:24px 0}.reading-section>p:not(.section-number),html[data-reading=true] .reading-section>p:not(.section-number){font-size:11pt;line-height:1.6}.chapter-header h1{font-size:26pt}.book-formula,.book-note,.book-review fieldset,.chapter-summary{page-break-inside:avoid;break-inside:avoid}.book-reader .diagram svg{min-width:0}.process-diagram svg{display:block}.process-diagram details>summary{display:none}}@media(max-width:360px){.profile-controls{gap:6px}.profile-menu summary{max-width:54px;line-height:1.3}.brand .brand-copy>span{max-width:110px;line-height:1.35;display:block}}:root{--neuro-action:#18212b;--neuro-action-text:#fff;--neuro-action-hover:#2c3947;--book-paper:#fcfdff;--book-surface:#fff;--book-raised:#f3f6fa;--book-ink:#121924;--book-muted:#626f82;--book-line:#e3e9f0;--book-accent:#326895;--book-accent-hover:#234f76;--book-tint:#eef4fa;--book-shadow:0 8px 28px #172e4805}html[data-theme=dark]{--neuro-action:#f5f5f7;--neuro-action-text:#111;--neuro-action-hover:#d1d1d6;--book-paper:#000;--book-surface:#1c1c1e;--book-raised:#2c2c2e;--book-ink:#f5f5f7;--book-muted:#aeaeb2;--book-line:#38383a;--book-accent:#d1d1d6;--book-accent-hover:#fff;--book-tint:#28282a}html[data-reading=true][data-theme=light]{--neuro-action:#353b2f;--neuro-action-hover:#4b5543}html[data-reading=true][data-theme=dark]{--neuro-action:#dadccc;--neuro-action-text:#20251c;--neuro-action-hover:#e6e9da}html[data-reading=true][data-theme=light]{--book-paper:#eee9df;--book-surface:#f8f3e9;--book-raised:#ede6d9;--book-ink:#292720;--book-muted:#696356;--book-line:#d9d0bf;--book-accent:#4c5d42;--book-accent-hover:#35462d;--book-tint:#e9eadc}html[data-reading=true][data-theme=dark]{--book-paper:#141411;--book-surface:#1c1d18;--book-raised:#292a23;--book-ink:#dddacf;--book-muted:#b0ad9e;--book-line:#3c3d32;--book-accent:#b5c4a0;--book-accent-hover:#d2ddc1;--book-tint:#2d3327}.neuro-wordmark{display:block;width:172px;height:auto;aspect-ratio:1565/280;flex-shrink:0}.neuro-wordmark-large{width:240px}html[data-theme=dark] .neuro-wordmark{filter:grayscale(1) invert(1)}.site-header{min-height:80px;max-width:none;padding:18px clamp(24px,3.25vw,64px);gap:48px;background:var(--book-surface);box-shadow:none}.brand{min-height:40px;gap:0}.header-links{align-self:stretch;gap:32px;align-items:center;font-size:13px}.header-links a{height:100%;display:flex;align-items:center;border-bottom:2px solid transparent;padding:8px 0;font-weight:500}.header-links a[aria-current=page]{border-bottom-color:var(--book-accent);color:var(--book-ink)}.header-actions{gap:20px}.profile-avatar{width:32px;height:32px;display:grid;place-items:center;background:var(--book-tint);color:var(--book-accent);border:1px solid var(--book-line);border-radius:50%;font-size:9px;font-weight:700}.profile-controls{gap:8px}.profile-name{font-size:12px}.appearance-panel,.profile-menu>div{box-shadow:0 12px 40px #15335412}.book-primary{background:var(--neuro-action);border-color:var(--neuro-action);color:var(--neuro-action-text);box-shadow:0 3px 10px #00000008}.book-primary:hover{background:var(--neuro-action-hover);border-color:var(--neuro-action-hover)}.book-secondary{box-shadow:none}.book-home{max-width:1360px;padding:0 clamp(24px,4vw,56px)}.book-hero{padding:80px 0 64px;gap:72px}.hero-copy h1{font-size:clamp(38px,4.4vw,60px);letter-spacing:-.05em;line-height:1.14}.hero-copy h1 em{color:var(--book-ink)}.hero-meta{font-size:11px}.start-panel{border-radius:16px;border-color:var(--book-line);background:var(--book-surface);box-shadow:var(--book-shadow);padding:32px}.start-panel:before{display:none}.start-panel h2{font-size:23px}.course-orientation{gap:64px}.book-home h2{font-size:28px}.catalog-unit li{border-radius:12px;box-shadow:none}.catalog-unit li>a{padding:24px}.catalog-unit strong{font-size:15px}.catalog-unit li>a:hover{background:var(--book-tint)}.catalog-card-meta{color:var(--book-muted)}.study-plan{background:var(--book-raised);border-color:var(--book-line)}.book-shell{max-width:1760px;grid-template-columns:270px minmax(0,900px);gap:0 44px;padding:28px clamp(24px,3vw,56px) 64px;justify-content:center}.navigation-toggle{margin-bottom:28px}.reader-breadcrumb{gap:12px;font-size:11px}.book-reader{background:transparent;border:0;border-radius:0;box-shadow:none;padding:12px 0 0}.book-sidebar{padding:8px 24px 16px 0;border-right:1px solid var(--book-line);top:108px}.sidebar-course{margin-bottom:32px}.sidebar-course h2{font-family:var(--ui-font);font-size:16px;letter-spacing:-.025em;line-height:1.5;font-weight:600;margin:16px 0 8px}.sidebar-course p{font-size:12px;line-height:1.8;color:var(--book-muted)}.learning-rail progress,.sidebar-course progress{display:block;-webkit-appearance:none;-moz-appearance:none;appearance:none;width:100%;height:6px;border:0;border-radius:8px;overflow:hidden;margin:22px 0 10px;background:var(--book-raised);accent-color:var(--book-accent)}.learning-rail progress::-webkit-progress-bar,.sidebar-course progress::-webkit-progress-bar{background:var(--book-raised)}.learning-rail progress::-webkit-progress-value,.sidebar-course progress::-webkit-progress-value{background:var(--book-accent);border-radius:8px}.learning-rail progress::-moz-progress-bar,.sidebar-course progress::-moz-progress-bar{background:var(--book-accent);border-radius:8px}.sidebar-course>div{display:flex;justify-content:space-between;gap:8px;font-size:10px;color:var(--book-muted)}.sidebar-course .book-back{font-size:10px;margin-bottom:14px}.book-sidebar summary{font-size:10px;letter-spacing:.07em;color:var(--book-muted)}.book-sidebar li a{padding:12px 10px;gap:12px;align-items:start;border-radius:9px}.book-sidebar li a>span:first-child{border:1px solid var(--book-line);border-radius:50%;width:22px;height:22px;display:grid;place-items:center;font-size:9px;line-height:1}.book-sidebar li a.chapter-done>span:first-child{background:var(--book-accent);color:var(--book-surface);border-color:var(--book-accent);font-size:12px}.book-sidebar li a.chapter-done[aria-current=page],.book-sidebar li a[aria-current=page]{color:var(--book-accent);background:var(--book-tint);box-shadow:none}.navigation-title small{display:block;font-weight:400;font-size:10px;color:var(--book-muted);margin-top:5px}.chapter-header{padding-bottom:28px}.chapter-header h1{font-size:clamp(30px,3.1vw,44px);letter-spacing:-.04em;line-height:1.2}.chapter-header>.chapter-description{font-size:16px;max-width:760px}.chapter-counter{font-size:10px;color:var(--book-muted);letter-spacing:.03em}.chapter-question{font-size:calc(var(--reader-size) + 1px);margin:24px 0}.reading-tools button{font-size:11px}.chapter-roadmap{background:var(--book-surface);border-radius:12px;border-color:var(--book-line);padding:18px 20px}.book-video{border-radius:14px;box-shadow:var(--book-shadow)}.video-aspect{border-radius:10px}.book-formula,.book-note,.chapter-pagination a,.chapter-summary{box-shadow:none}.chapter-pagination strong{font-size:13px}.learning-rail{display:none;position:-webkit-sticky;position:sticky;top:108px;min-width:0}.learning-rail>section{background:var(--book-surface);border:1px solid var(--book-line);border-radius:14px;padding:24px;box-shadow:var(--book-shadow)}.learning-progress-title{display:flex;align-items:center;justify-content:space-between;gap:16px;font-size:12px}.learning-progress-title h2{font-family:var(--ui-font);font-size:13px;font-weight:600;letter-spacing:0;margin:0}.learning-rail p{font-size:10px;color:var(--book-muted);line-height:1.8}.learning-goals{margin-top:24px;padding-top:24px;border-top:1px solid var(--book-line)}.learning-goals summary{cursor:pointer;font-size:12px;font-weight:600;line-height:1.5}.learning-goals ul{list-style:none;margin:18px 0 0;padding:0}.learning-goals li{display:flex;gap:10px;align-items:flex-start;font-size:11px;line-height:1.85;color:var(--book-muted);margin:16px 0}.goal-dot{width:12px;height:12px;border-radius:50%;border:1px solid var(--book-line);flex-shrink:0;margin-top:4px}.book-shell.navigation-collapsed{max-width:1200px;grid-template-columns:minmax(0,1fr)}.book-shell.navigation-collapsed .learning-rail{display:none}.neuro-login{max-width:1160px;min-height:calc(100dvh - 190px);margin:auto;padding:80px 40px;display:grid;grid-template-columns:1fr 1fr;align-items:center;grid-gap:100px;gap:100px}.login-introduction>.neuro-wordmark{margin-bottom:48px}.login-introduction .eyebrow{font-size:10px}.login-introduction h1{font-family:var(--ui-font);font-weight:600;letter-spacing:-.05em;line-height:1.16;font-size:clamp(34px,3.6vw,46px);margin:22px 0}.login-introduction>p:not(.eyebrow){max-width:430px;font-size:15px;line-height:1.9;color:var(--book-muted)}.login-course{display:flex;align-items:flex-start;gap:14px;margin-top:44px}.login-course-line{display:block;width:3px;height:40px;background:var(--book-accent);border-radius:2px;flex-shrink:0}.login-course strong{display:block;font-size:12px;font-weight:600;margin:0 0 6px}.login-course div>span{font-size:11px;color:var(--book-muted)}.login-card{padding:36px;border:1px solid var(--book-line);border-radius:18px;background:var(--book-surface);box-shadow:0 12px 50px #15335408}.login-card h2{font-family:var(--ui-font);font-size:24px;font-weight:600;line-height:1.4;letter-spacing:-.035em;margin:12px 0}.login-card>p:not(.eyebrow){font-size:12px;line-height:1.8;color:var(--book-muted)}.login-card .login-form{background:transparent;border:0;border-radius:0;max-width:none;padding:0;margin:28px 0 12px;gap:10px}.login-card .login-form label{font-size:11px;margin-top:8px}.login-card .login-form input,.login-card .login-form select{min-height:46px;background:var(--book-paper);border-radius:9px;font-size:13px}.login-card .login-form>.book-primary{margin-top:18px;min-height:46px;width:100%}.password-field{position:relative}.password-field input{padding-right:65px}.password-visibility{position:absolute;right:12px;top:50%;transform:translateY(-50%);padding:6px 4px;background:transparent;color:var(--book-muted);font-size:10px;font-weight:500;border-radius:4px}.login-card .login-storage-note{font-size:10px!important;padding-top:14px;border-top:1px solid var(--book-line)}.login-card .login-guest{margin-top:22px;text-align:center;font-size:11px!important}.login-guest a{font-weight:600;text-decoration:none}html[data-reading=true] .learning-rail{display:none!important}html[data-reading=true] .book-reader{background:var(--book-surface);border-radius:2px}@media(min-width:1440px){.book-shell{grid-template-columns:270px minmax(0,900px) 230px;gap:0 36px}.learning-rail{display:block}}@media(max-width:1199px){.site-header{gap:30px;padding-inline:28px}.book-shell{grid-template-columns:235px minmax(0,1fr);gap:0 30px;padding-inline:28px}.book-sidebar{padding-right:18px}.neuro-login{gap:60px;padding:60px 36px}.header-links{gap:24px}.neuro-wordmark{width:154px}.neuro-wordmark-large{width:220px}}@media(max-width:1023px){.site-header{min-height:74px;gap:24px;padding:16px 24px;flex-wrap:wrap}.book-shell,.book-shell.navigation-collapsed{display:flex;flex-direction:column;padding:22px 28px 48px;gap:0}.navigation-toggle{width:100%;order:0;margin-bottom:20px}.book-sidebar{display:none;position:static;max-height:none;width:100%;order:1;border:1px solid var(--book-line);border-radius:12px;background:var(--book-surface);padding:20px;margin-bottom:20px}.navigation-open-mobile .book-sidebar:not([hidden]){display:block}.book-sidebar ol{max-height:260px;overflow:auto}.sidebar-course{margin-bottom:20px}.sidebar-course p{display:none}.sidebar-course h2{margin:12px 0}.sidebar-course progress{margin-top:14px}.learning-rail{display:block;order:2;position:static;width:100%;margin:0 0 28px}.book-shell.navigation-collapsed .learning-rail{display:block}.learning-rail>section{padding:18px 22px;display:grid;grid-template-columns:1fr 1fr;grid-gap:0 32px;gap:0 32px;align-items:start}.learning-progress-title,.learning-rail progress,.learning-rail>section>p{grid-column:1}.learning-rail progress{margin:14px 0 8px}.learning-goals{grid-column:2;grid-row:1/span 3;border:0;border-left:1px solid var(--book-line);margin:0;padding:0 0 0 24px}.learning-goals ul{margin-top:12px}.book-reader{width:100%;order:3;padding:0}.book-shell.navigation-collapsed .book-reader{width:100%}.book-hero{gap:40px;padding:58px 0}.book-hero .hero-copy h1{font-size:44px}.header-links{order:0;flex-basis:auto}.header-actions{gap:12px}.neuro-login{gap:40px;padding:52px 28px}.login-card{padding:28px}.login-introduction h1{font-size:36px}}@media(max-width:767px){.site-header{padding:12px 20px;gap:12px 20px;min-height:72px}.header-links{order:3;flex-basis:100%;gap:26px;font-size:11px}.header-links a{padding:6px 0 9px}.neuro-wordmark{width:142px}.neuro-wordmark-large{width:200px}.header-actions{margin-left:auto;gap:10px}.book-home{padding:0 24px}.book-hero{padding:42px 0;grid-template-columns:1fr;gap:30px}.book-hero .hero-copy h1,.hero-copy h1{font-size:40px}.book-shell,.book-shell.navigation-collapsed{padding:20px 24px 40px}.reader-breadcrumb{font-size:10px;gap:8px}.reader-breadcrumb>span:last-child{max-width:170px;line-height:1.5}.learning-rail>section{padding:18px}.learning-goals{padding-left:18px}.chapter-header h1{font-size:32px}.chapter-header>.chapter-description{font-size:15px}.neuro-login{grid-template-columns:1fr;gap:32px;max-width:580px;padding:40px 24px;min-height:0}.login-introduction>.neuro-wordmark{margin-bottom:30px}.login-introduction h1{font-size:36px;margin:16px 0}.login-introduction>p:not(.eyebrow){font-size:14px}.login-course{margin-top:24px}.login-card{padding:28px}.login-card h2{font-size:23px}.catalog-unit li>a{padding:22px}}@media(max-width:540px){.site-header{padding:12px 18px;gap:10px 14px}.neuro-wordmark{width:122px}.neuro-wordmark-large{width:188px}.profile-avatar{width:28px;height:28px;font-size:8px}.profile-name{display:none}.profile-menu summary{font-size:10px;max-width:64px;line-height:1.4}.profile-controls{gap:6px}.appearance-menu>summary>span:last-child{display:none}.appearance-panel,.profile-menu>div{top:106px}.book-home{padding:0 20px}.book-shell,.book-shell.navigation-collapsed{padding:18px 20px 36px}.navigation-toggle{gap:12px}.navigation-toggle .book-secondary{padding:8px 10px;font-size:10px;white-space:nowrap}.reader-breadcrumb>span:last-child{max-width:150px}.learning-rail>section{display:block;padding:18px}.learning-rail{margin-bottom:24px}.learning-goals{border-left:0;border-top:1px solid var(--book-line);margin-top:14px;padding:14px 0 0}.learning-rail progress{margin:12px 0 6px}.chapter-header h1{font-size:30px}.reading-tools button{padding:8px 10px}.login-card{padding:24px}.login-introduction h1{font-size:33px}.neuro-login{padding:32px 20px 44px}.chapter-pagination{grid-template-columns:1fr;gap:10px}.chapter-pagination a:last-child{text-align:left}}@media print{.learning-rail,.neuro-wordmark{display:none!important}.book-reader{padding:0!important}:root,html[data-theme=dark]{--book-paper:white;--book-surface:white;--book-ink:black;--book-muted:#333;--book-accent:#222;--book-line:#ccc}}.login-scene{position:relative;isolation:isolate;min-height:calc(100dvh - 110px);background:var(--book-paper)}.login-neural-background{position:absolute;inset:0;overflow:hidden;pointer-events:none;z-index:-1;color:var(--book-ink)}.login-neural-background svg{display:block;width:100%;height:100%}.neural-connections{opacity:.055}.neural-nodes{opacity:.1}html[data-theme=dark] .neural-connections{opacity:.07}html[data-theme=dark] .neural-nodes{opacity:.12}.login-display-controls{position:absolute;top:22px;right:clamp(20px,3.25vw,64px);z-index:100}.login-scene .neuro-login{padding-top:96px;min-height:calc(100dvh - 110px)}.login-scene .login-card{box-shadow:0 12px 50px #00000006}@media (max-width:767px){.login-scene .neuro-login{min-height:0;padding-top:80px}.login-neural-background svg{width:180%;max-width:none;margin-left:-40%}.neural-connections{opacity:.04}.neural-nodes{opacity:.075}.login-display-controls .appearance-panel{top:64px;max-height:calc(100dvh - 84px)}}.book-reader,.font-preview,.glossary-list dd{font-weight:var(--reader-weight,400)}.appearance-embedded>summary,.mobile-navigation{display:none}.appearance-embedded .appearance-panel{position:static;width:auto;max-height:none;overflow:visible;padding:0;border:0;border-radius:0;box-shadow:none;background:transparent}.appearance-embedded .appearance-heading{display:none}@media (max-width:1023px){.site-header{position:-webkit-sticky;position:sticky;top:0;z-index:70;display:block;min-height:0;padding:env(safe-area-inset-top,0) 16px 0;border-bottom:1px solid var(--book-line);background:var(--book-surface)}.site-header>.desktop-brand,.site-header>.header-actions,.site-header>.header-links{display:none}.mobile-navigation{display:block}.mobile-header-row{display:grid;grid-template-columns:44px minmax(0,1fr) 44px;align-items:center;grid-gap:12px;gap:12px;height:64px}.mobile-brand{justify-self:center;line-height:0}.mobile-brand .neuro-wordmark{width:140px}.mobile-icon-button{display:grid;place-items:center;width:44px;height:44px;padding:10px;border:0;border-radius:12px;background:transparent;color:var(--book-ink);cursor:pointer}.mobile-icon-button:active,.mobile-icon-button:hover{background:var(--book-raised)}.mobile-icon-button:focus-visible{outline:2px solid var(--book-accent);outline-offset:2px}.mobile-icon-button svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}.mobile-display-button{font-size:16px;font-weight:500;letter-spacing:-.05em}.mobile-drawer{position:fixed;inset:0 auto 0 0;margin:0;padding:0;width:min(88vw,360px);max-width:none;height:100dvh;max-height:100dvh;border:0;border-right:1px solid var(--book-line);background:var(--book-surface);color:var(--book-ink);box-shadow:12px 0 64px #0002;overflow:hidden}.mobile-drawer[open]{display:flex;flex-direction:column;animation:mobile-drawer-in .18s ease-out}.mobile-drawer::-webkit-backdrop{background:#111b2b66}.mobile-drawer::backdrop{background:#111b2b66}html[data-theme=dark] .mobile-drawer::-webkit-backdrop{background:#0009}html[data-theme=dark] .mobile-drawer::backdrop{background:#0009}.mobile-drawer-heading{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:calc(12px + env(safe-area-inset-top,0px)) 16px 12px 22px;flex-shrink:0;border-bottom:1px solid var(--book-line)}.mobile-drawer-heading .neuro-wordmark{width:144px}.mobile-drawer-content{min-height:0;flex:1 1;overflow-y:auto;overscroll-behavior:contain;padding:16px 14px 24px;scrollbar-width:thin}.mobile-destination-links{display:grid;grid-gap:4px;gap:4px}.mobile-destination-links a{display:flex;align-items:center;justify-content:space-between;min-height:46px;padding:12px;border-radius:10px;font-size:14px;font-weight:500;text-decoration:none;color:var(--book-ink)}.mobile-destination-links a:hover,.mobile-destination-links a[aria-current=page]{background:var(--book-raised)}.mobile-settings{margin:14px 0 22px;border-block:1px solid var(--book-line)}.mobile-settings>summary{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:52px;padding:14px 12px;font-size:13px;font-weight:500;cursor:pointer;list-style:none}.mobile-settings>summary::-webkit-details-marker{display:none}.mobile-settings>summary>span{font-size:15px;color:var(--book-muted)}.mobile-settings .appearance-embedded{padding:0 12px 12px}.mobile-settings select{min-height:46px;font-size:16px}.mobile-settings button{min-height:44px}.mobile-settings .font-size-control{gap:8px}.mobile-settings .appearance-footer{flex-wrap:wrap;gap:12px}.mobile-course-progress{padding:0 12px 18px}.mobile-course-progress>p{display:flex;justify-content:space-between;gap:12px;font-size:12px;font-weight:600;line-height:1.6;margin:0 0 12px}.mobile-course-progress strong{font-feature-settings:"tnum";font-variant-numeric:tabular-nums;color:var(--book-accent)}.mobile-course-progress progress{display:block;width:100%;height:4px;accent-color:var(--book-accent);margin-bottom:10px}.mobile-course-progress small{font-size:11px;color:var(--book-muted)}.mobile-chapter-list ol{list-style:none;padding:0;margin:0;display:grid;grid-gap:4px;gap:4px}.mobile-chapter-list a{display:flex;gap:12px;align-items:flex-start;min-height:52px;padding:14px 12px;border:1px solid transparent;border-radius:10px;color:var(--book-muted);font-size:13px;line-height:1.65;text-decoration:none;overflow-wrap:anywhere}.mobile-chapter-list a[aria-current=page]{background:var(--book-tint);border-color:var(--book-line);color:var(--book-ink);font-weight:600}.mobile-chapter-list a.chapter-done{color:var(--book-accent)}.mobile-chapter-number{flex:0 0 22px;font-size:11px;line-height:1.95;font-feature-settings:"tnum";font-variant-numeric:tabular-nums}.mobile-profile{position:relative;flex-shrink:0;padding:14px 22px calc(14px + env(safe-area-inset-bottom,0px));border-top:1px solid var(--book-line)}.mobile-profile .profile-controls{position:static;gap:10px;min-height:40px}.mobile-profile .profile-avatar{width:32px;height:32px;font-size:10px}.mobile-profile .profile-name{display:block;font-size:13px}.mobile-profile .profile-menu{position:static;margin-left:auto}.mobile-profile .profile-menu summary{max-width:none;min-height:44px;display:flex;align-items:center;font-size:12px}.mobile-profile .profile-menu>div{position:absolute;inset:auto 12px calc(100% + 8px);width:auto;max-height:60dvh;overflow:auto;overscroll-behavior:contain;box-shadow:var(--book-shadow)}.mobile-profile .profile-menu button{min-height:44px}.book-shell,.book-shell.navigation-collapsed{padding:20px clamp(20px,4vw,32px) 40px}.book-shell.navigation-collapsed .learning-rail,.book-sidebar,.learning-rail,.navigation-open-mobile .book-sidebar:not([hidden]){display:none!important}.navigation-toggle{margin-bottom:18px}.navigation-toggle>.book-secondary{display:none}.reader-breadcrumb{font-size:11px}.reader-breadcrumb>span:last-child{max-width:none}.chapter-header h1{font-size:clamp(28px,5vw,36px);line-height:1.18;letter-spacing:-.035em}.chapter-header>.chapter-description{font-size:16px;line-height:1.75}.chapter-counter{font-size:11px;line-height:1.7}.reading-tools{gap:8px}.reading-tools button{min-height:44px;padding:10px 13px;font-size:11px}.login-form input,.login-form select,.notebook textarea{font-size:max(16px,var(--reader-size))}.book-review label{min-height:52px}.chapter-roadmap summary,.chapter-sources summary{min-height:44px;display:flex;align-items:center}.reading-section{scroll-margin-top:90px}}@keyframes mobile-drawer-in{0%{opacity:.8;transform:translateX(-20px)}to{opacity:1;transform:translateX(0)}}@media (prefers-reduced-motion:reduce){.mobile-drawer[open]{animation:none}}@media print{.mobile-navigation{display:none!important}}.settings-icon,.theme-toggle svg{display:block;width:19px;height:19px;fill:none;stroke:currentColor;stroke-width:1.65;stroke-linecap:round;stroke-linejoin:round}.theme-toggle{display:grid;place-items:center;flex-shrink:0;width:40px;height:40px;padding:10px;background:transparent;border:0;border-radius:10px;color:var(--book-ink);cursor:pointer}.theme-toggle:hover{background:var(--book-raised)}.theme-toggle:focus-visible{outline:2px solid var(--book-accent);outline-offset:2px}.login-profile-choice{padding:0;margin:0;border:0;min-width:0}.login-profile-choice legend{padding:0;margin:8px 0 10px;font-size:11px;color:var(--book-ink)}.login-profile-choice>div{display:grid;grid-template-columns:1fr 1fr;grid-gap:8px;gap:8px}.login-card .login-form .login-profile-choice label{position:relative;margin:0;cursor:pointer}.login-profile-choice input{position:absolute;opacity:0;width:1px;height:1px;min-height:0!important;padding:0}.login-profile-choice label>span{display:grid;place-items:center;min-height:46px;border:1px solid var(--book-line);border-radius:9px;background:var(--book-paper);font-size:13px;color:var(--book-muted)}.login-profile-choice input:checked+span{background:var(--book-tint);border-color:var(--book-accent);color:var(--book-ink);font-weight:600}.login-profile-choice input:focus-visible+span{outline:2px solid var(--book-accent);outline-offset:3px}.login-profile-choice:disabled label{opacity:.6;cursor:default}@media(max-width:1023px){.mobile-header-row{grid-template-columns:44px minmax(0,1fr) auto;gap:8px}.mobile-quick-controls{display:flex;align-items:center;gap:0}.mobile-quick-controls .theme-toggle{width:44px;height:44px}.mobile-settings>summary>.settings-icon{width:18px;height:18px;color:var(--book-muted)}}@media(max-width:360px){.mobile-brand .neuro-wordmark{width:116px}}@media(max-width:1023px){.mobile-settings-dialog{inset:0 0 0 auto;border-right:0;border-left:1px solid var(--book-line);box-shadow:-12px 0 64px #0002}.mobile-settings-dialog[open]{animation:mobile-settings-in .18s ease-out}.mobile-settings-dialog .mobile-drawer-heading h2{margin:0;font-size:18px;line-height:1.4;font-weight:600;letter-spacing:-.025em}.mobile-settings-content{padding:4px 24px 28px}.mobile-settings-content select{min-height:46px;font-size:16px}.mobile-settings-content button{min-height:44px}.mobile-settings-content .font-size-control{gap:8px}.mobile-settings-content .appearance-footer{flex-wrap:wrap;gap:12px}}@keyframes mobile-settings-in{0%{opacity:.8;transform:translateX(20px)}to{opacity:1;transform:translateX(0)}}@media(prefers-reduced-motion:reduce){.mobile-settings-dialog[open]{animation:none}}.login-neural-background .neural-portrait{display:none}@media(max-width:1023px){body:has(.login-scene) footer.site{display:none}.login-scene{min-height:100dvh}.login-scene .neuro-login{grid-template-columns:1fr;width:100%;max-width:460px;min-height:100dvh;padding:calc(90px + env(safe-area-inset-top,0px)) 24px calc(40px + env(safe-area-inset-bottom,0px));gap:48px;align-content:center;align-items:start}.login-introduction{display:flex;justify-content:center}.login-introduction>:not(.neuro-wordmark){display:none}.login-introduction>.neuro-wordmark{width:min(330px,84vw);margin:0}.login-card{position:relative;padding:28px;border-radius:20px}.login-card>p{display:none}.login-card>h2{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.login-card .login-form{margin:0;gap:14px}.login-profile-choice legend{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}.login-card .login-form>label{font-size:12px}.login-profile-choice label>span{font-size:14px;min-height:48px}.login-card .login-form>.book-primary{min-height:48px;margin-top:10px;font-size:14px}.login-card .login-form>p:empty,.login-display-controls .appearance-menu>summary>span{display:none}.login-display-controls .appearance-menu>summary{min-width:44px;min-height:44px;display:grid;place-items:center;padding:10px}.login-display-controls{top:calc(18px + env(safe-area-inset-top,0px));right:20px}.login-neural-background .neural-landscape{display:none}.login-neural-background .neural-portrait{display:block;width:100%;height:100%;margin:0}.login-scene .neural-connections{opacity:.14;stroke-width:1}.login-scene .neural-nodes{opacity:.2}html[data-theme=dark] .login-scene .neural-connections{opacity:.16}html[data-theme=dark] .login-scene .neural-nodes{opacity:.24}}@media(max-width:360px){.login-scene .neuro-login{padding-inline:20px;gap:36px}.login-scene .login-card{padding:24px}}