@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Libre+Baskerville:ital,wght@0,400;0,700;1,400&display=swap');

:root{color-scheme:dark;--bg:#071723;--deep:#0b202b;--panel:#102e38;--panel2:#173843;--ink:#f5f4ed;--muted:#b6c7c9;--silver:#d2dedb;--line:rgba(209,225,221,.18);--aqua:#a9d4c8;--mauve:#d1bace;--warm:#e1c5a9;font-family:'DM Sans',system-ui,sans-serif;font-synthesis:none;scroll-behavior:smooth}
*{box-sizing:border-box}body{margin:0;min-width:320px;background:var(--bg);color:var(--ink);font-size:16px;line-height:1.6}button,a{font:inherit}a{color:inherit}button{cursor:pointer}button:focus-visible,a:focus-visible{outline:2px solid var(--warm);outline-offset:4px}.skip-link{position:absolute;top:-60px;left:20px;z-index:20;background:var(--ink);color:var(--bg);padding:10px 16px}.skip-link:focus{top:10px}.page-shell{overflow:hidden}.site-header{height:88px;display:flex;align-items:center;justify-content:space-between;gap:28px;max-width:1520px;padding:0 clamp(24px,5vw,80px);margin:auto;position:relative;z-index:5}.brand{text-decoration:none;display:flex;align-items:center;gap:12px;font-size:10px;font-weight:700;letter-spacing:.17em;line-height:1.4}.brand strong{font-size:13px;letter-spacing:.35em;font-weight:500}.brand-mark{width:42px;height:42px;border:1px solid rgba(225,241,232,.5);border-radius:50%;display:grid;place-items:center;font-size:19px;font-weight:500;letter-spacing:-.12em;padding-right:4px}.brand-mark span{color:var(--warm)}.header-links{display:flex;gap:30px;align-items:center}.header-links a{text-decoration:none;color:#d6e2e0;font-size:14px}.header-links a:hover,.closing a:hover{color:#fff;text-decoration:underline;text-decoration-color:var(--aqua);text-underline-offset:6px}.header-exit{border:1px solid var(--line);border-radius:100px;padding:10px 17px}.header-exit span{padding-left:8px;color:var(--aqua)}
.intro{min-height:630px;position:relative;display:flex;align-items:center;max-width:1600px;margin:0 auto;padding:52px clamp(24px,7vw,110px) 94px;isolation:isolate}.intro::before{content:"";position:absolute;z-index:-3;inset:0;background:radial-gradient(ellipse at 78% 58%,rgba(78,132,126,.24),transparent 39%),radial-gradient(ellipse at 25% 88%,rgba(92,89,119,.15),transparent 52%),linear-gradient(120deg,#071723 20%,#102a34 80%)}.intro::after{content:"";height:1px;position:absolute;left:5%;right:5%;bottom:0;background:linear-gradient(90deg,transparent,rgba(226,236,231,.32),transparent)}.intro-art{position:absolute;z-index:-2;inset:0;background-image:linear-gradient(90deg,#071723 2%,rgba(7,23,35,.92) 29%,rgba(7,23,35,.2) 79%,rgba(7,23,35,.15)),url('vagus-flow.webp');background-size:cover;background-position:center;opacity:.87}.intro-copy{position:relative;max-width:620px;padding-bottom:30px}.eyebrow{font-size:12px;font-weight:700;letter-spacing:.23em;color:var(--aqua);margin:0 0 22px}.eyebrow-line{display:inline-block;width:28px;height:1px;background:var(--aqua);vertical-align:middle;margin-right:12px}.intro h1,.closing h2,.section-heading h2,.chapter-panel h3{font-family:'Libre Baskerville',Georgia,serif;font-weight:400;letter-spacing:-.055em}.intro h1{font-size:clamp(53px,6.5vw,105px);line-height:1.04;margin:0 0 28px;max-width:650px}.intro h1 em,.closing h2 em{font-weight:400;color:#b6d8d1}.intro-lead{font-family:'Libre Baskerville',Georgia,serif;font-size:clamp(20px,2vw,28px);line-height:1.46;color:#f2f2e9;max-width:560px;margin:0 0 17px}.intro-body{color:#c7d3d2;max-width:510px;line-height:1.8;margin:0 0 28px}.primary-link{display:inline-flex;gap:50px;align-items:center;padding:12px 16px 12px 22px;border-radius:100px;background:#d9e7dd;color:#0a242d;text-decoration:none;font-weight:700;font-size:14px;transition:transform .2s,background .2s}.primary-link:hover{transform:translateY(-2px);background:#fff}.primary-link span{font-size:24px;font-weight:400}.reading-note{margin:15px 0 0;color:#abbfbe;font-size:13px}.signal-preview{position:absolute;right:clamp(24px,7vw,110px);bottom:30px;width:min(33vw,340px);padding:22px 24px;border:1px solid rgba(230,244,237,.21);border-radius:18px;background:rgba(8,28,36,.7);backdrop-filter:blur(14px);box-shadow:0 15px 45px rgba(0,0,0,.17)}.signal-kicker{color:var(--warm);font-size:11px;font-weight:700;letter-spacing:.2em}.signal-flow{display:flex;align-items:center;gap:10px;margin:13px 0 4px;color:#eff8ef;font-weight:600;font-size:14px}.signal-track{flex:1;height:1px;background:linear-gradient(90deg,#bcd7cf,#d1c6cb);position:relative}.signal-track::before,.signal-track::after{content:"";position:absolute;top:-2.5px;height:6px;width:6px;border-radius:50%;background:#d5e2d9}.signal-track::before{left:0}.signal-track::after{right:0}.signal-track i{position:absolute;left:42%;top:-3px;width:7px;height:7px;background:#e9dccb;border-radius:50%;box-shadow:0 0 14px #e9dccb;animation:signal 4s ease-in-out infinite alternate}@keyframes signal{to{left:73%}}.signal-preview p{margin:9px 0 0;font-size:13px;line-height:1.6;color:#c0d2d0}
.course-section{max-width:1440px;margin:auto;padding:95px clamp(24px,5vw,80px) 120px;scroll-margin-top:20px}.section-heading{display:flex;align-items:end;justify-content:space-between;gap:30px;margin-bottom:36px}.section-heading .eyebrow{margin-bottom:10px}.section-heading h2{font-size:clamp(31px,3.2vw,48px);line-height:1.2;margin:0}.section-heading>p{max-width:295px;color:var(--muted);margin:0 0 4px}.course-layout{display:grid;grid-template-columns:minmax(250px,320px) minmax(0,1fr);gap:24px;align-items:start}.chapter-nav{position:sticky;top:20px;padding:22px 16px 24px;border:1px solid var(--line);border-radius:22px;background:linear-gradient(155deg,rgba(29,67,75,.76),rgba(13,39,50,.74))}.nav-group-label{font-size:11px;font-weight:700;letter-spacing:.19em;color:#a9c0bc;margin:17px 13px 9px}.nav-group-label:first-child{margin-top:0}.chapter-button{display:grid;grid-template-columns:28px 1fr 16px;align-items:center;gap:9px;width:100%;padding:12px 13px;border:1px solid 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Baskerville',Georgia,serif;font-size:19px;color:#f3ebe1;margin:0;line-height:1.55}.signal-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.signal-list details{border:1px solid var(--line);border-radius:13px;background:rgba(230,244,231,.05);padding:0 18px}.signal-list details[open]{background:rgba(230,244,231,.085)}.signal-list summary{list-style:none;padding:19px 0;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-weight:600}.signal-list summary::-webkit-details-marker{display:none}.signal-list summary:after{content:'+';font-size:22px;line-height:1;color:var(--aqua)}.signal-list details[open] summary:after{content:'−'}.signal-list ul{padding-left:19px;margin:0 0 18px;color:#d1dedb;line-height:1.75}.practice-list{display:grid;gap:10px}.practice-item{display:flex;gap:20px;padding:19px 20px;border:1px solid var(--line);border-radius:14px;background:rgba(226,243,230,.04)}.practice-item b{font-size:12px;letter-spacing:.13em;color:var(--warm);min-width:24px}.practice-item strong{font-size:16px}.practice-item p{font-size:14px;margin:5px 0 0}.chapter-bottom{display:flex;justify-content:space-between;align-items:center;gap:20px;border-top:1px solid var(--line);padding-top:25px;margin-top:38px}.chapter-bottom .progress-label{font-size:13px;color:#afc5c0}.next-button{border:1px solid rgba(220,233,222,.4);border-radius:100px;background:rgba(210,232,218,.1);color:#f7f6ee;padding:12px 19px;font-size:14px;font-weight:600;display:inline-flex;align-items:center;gap:22px}.next-button:hover{background:rgba(210,232,218,.2)}.sources{border-top:1px solid var(--line);margin-top:32px;padding-top:20px}.sources summary{color:#b9cfca;cursor:pointer;font-size:14px}.sources ul{padding-left:20px;color:#adc3be;font-size:13px;line-height:1.75}.sources a{color:#d9e8df;text-underline-offset:3px}
.closing{position:relative;max-width:1440px;margin:0 auto;padding:104px clamp(24px,8vw,120px) 115px;background:radial-gradient(ellipse at 83% 46%,rgba(79,130,126,.18),transparent 45%)}.closing-line{position:absolute;left:clamp(24px,8vw,120px);right:clamp(24px,8vw,120px);top:0;height:1px;background:var(--line)}.closing h2{max-width:780px;font-size:clamp(40px,5.3vw,76px);line-height:1.2;margin:0 0 20px}.closing>p:not(.eyebrow){color:#c7d7d2;max-width:650px;font-size:18px;line-height:1.8}.closing-links{display:flex;flex-wrap:wrap;gap:18px 32px;margin-top:38px}.closing-links a{color:#e3ece6;text-decoration:none;border-bottom:1px solid rgba(210,227,216,.45);padding-bottom:6px;font-weight:600;font-size:14px}.closing-links span{margin-left:8px;color:var(--aqua)}footer{border-top:1px solid var(--line);padding:34px clamp(24px,5vw,80px) 50px;display:flex;flex-wrap:wrap;justify-content:space-between;gap:15px 35px;color:#9db5b3;font-size:12px;max-width:1520px;margin:auto}footer p{margin:0;max-width:560px}.footer-brand{letter-spacing:.13em;color:#c4d3ce;font-weight:700}.footer-brand span{color:var(--warm);margin:0 3px}
@media(max-width:1080px){.intro{min-height:620px}.signal-preview{width:280px}.course-layout{grid-template-columns:260px 1fr}.chapter-nav{padding:18px 10px}.chapter-button{font-size:13px;padding:11px 9px}.intro-art{background-position:58% center}}
@media(max-width:760px){.site-header{height:76px;padding:0 21px}.header-links a:not(.header-exit){display:none}.header-exit{padding:8px 11px;font-size:12px!important}.brand{font-size:9px}.brand-mark{width:37px;height:37px}.intro{min-height:640px;display:block;padding:68px 24px 186px}.intro-art{background-image:linear-gradient(180deg,rgba(7,23,35,.8),rgba(7,23,35,.56) 56%,#071723 96%),url('vagus-flow.webp');background-position:60% center;opacity:.75}.intro h1{font-size:clamp(57px,13vw,84px);max-width:540px}.intro-copy{padding:0}.intro-lead{font-size:22px}.intro-body{font-size:15px;line-height:1.7}.signal-preview{left:24px;right:24px;bottom:25px;width:auto;max-width:420px;padding:17px 19px}.course-section{padding:70px 20px 76px}.section-heading{display:block;margin-bottom:23px}.section-heading>p{max-width:580px;margin:14px 0 0;font-size:15px}.course-layout{display:block}.chapter-nav{position:static;display:flex;overflow-x:auto;gap:8px;padding:11px;margin-bottom:15px;border-radius:15px;scrollbar-color:#4b6c6d transparent}.nav-group-label{display:none}.chapter-button{flex:0 0 auto;display:flex;gap:6px;width:auto;white-space:nowrap;padding:10px 12px}.chapter-arrow{display:none}.chapter-panel{padding:25px 21px;min-height:0;border-radius:18px}.chapter-panel h3{font-size:clamp(34px,8vw,51px)}.chapter-intro{font-size:16px}.closing{padding:79px 24px 87px}.closing-line{left:24px;right:24px}footer{padding:28px 24px 45px;display:block}footer p{margin-top:12px}.route-map{grid-template-columns:1fr;gap:7px}.route-node{min-height:75px;padding:10px}.route-connector{transform:rotate(90deg);line-height:20px}.info-grid,.signal-list{grid-template-columns:1fr}.chapter-bottom{align-items:flex-start}.chapter-bottom .progress-label{display:none}}
@media(max-width:420px){.header-exit{max-width:145px;text-align:center;line-height:1.3}.intro{padding-top:57px}.intro h1{font-size:54px}.eyebrow{font-size:10px}.signal-preview{left:20px;right:20px}.chapter-panel{padding:22px 18px}.course-section{padding-left:14px;padding-right:14px}.chapter-topline{font-size:10px}.chapter-topline .duration{display:none}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;animation:none!important;transition:none!important}}

/* Opening and guided path */
[hidden]{display:none!important}
.page-shell{min-height:100svh;display:flex;flex-direction:column}
main{flex:1}
body:not([data-scene="closing"]) footer{display:none}
.scene:not([hidden]){animation:scene-in .32s ease both}
@keyframes scene-in{from{opacity:.4}to{opacity:1}}
.intro{min-height:calc(100svh - 88px);padding-top:30px;padding-bottom:58px}
.intro-copy{padding-bottom:0}
.signal-preview{bottom:20px}
.course-section{min-height:calc(100svh - 88px);padding:30px clamp(24px,5vw,80px) 40px;display:flex;flex-direction:column}
.course-section{position:relative;isolation:isolate}
.course-section::before{content:"";position:absolute;z-index:-1;inset:0;background-image:linear-gradient(100deg,rgba(7,23,35,.95),rgba(7,23,35,.63) 56%,rgba(7,23,35,.8)),url('vagus-flow.webp');background-size:cover;background-position:center;opacity:.44;pointer-events:none}
.journey-header{display:flex;align-items:center;justify-content:space-between;gap:24px;margin-bottom:22px}
.return-link{font-size:14px;text-decoration:none;color:#cbdcd7;border-bottom:1px solid rgba(203,220,215,.4);padding:4px 0}
.return-link:hover{color:#fff}
.return-link span{margin-right:9px;color:var(--aqua)}
.journey-progress{display:grid;grid-template-columns:auto auto;gap:3px 18px;align-items:center;color:#bcd1ca;font-size:12px;font-weight:700;letter-spacing:.16em;text-transform:uppercase;min-width:175px}
.journey-progress span:nth-child(2){text-align:right;color:#eeeae0}
.progress-track{grid-column:1/-1;height:3px;background:rgba(200,225,213,.18);border-radius:4px;overflow:hidden}
.progress-track i{display:block;width:14%;height:100%;background:linear-gradient(90deg,var(--aqua),var(--warm));transition:width .3s ease}
.course-layout{flex:1;min-height:0;align-items:start}
.mobile-jump{display:none}
.chapter-nav{position:sticky;top:22px}
.chapter-button{text-decoration:none}
.chapter-panel{min-height:0;max-height:calc(100svh - 255px);overflow-y:auto;border:1px solid rgba(228,238,229,.24);border-radius:24px;background:linear-gradient(145deg,rgba(36,77,82,.78),rgba(11,39,50,.85) 58%,rgba(11,35,44,.91));backdrop-filter:blur(18px);box-shadow:0 32px 80px rgba(0,0,0,.18);scrollbar-color:#698e88 transparent;scrollbar-width:thin}
.chapter-inner{animation:scene-in .3s ease both}
.chapter-panel{--chapter-pad:clamp(27px,4vw,58px)}
.chapter-inner{position:relative;isolation:isolate}
.chapter-inner.has-motion>:not(.chapter-motion){position:relative;z-index:1}
.chapter-inner.has-motion h3{text-shadow:0 3px 28px rgba(5,20,29,.75)}
.chapter-motion{position:absolute;z-index:0;top:calc(0px - var(--chapter-pad));left:calc(0px - var(--chapter-pad));right:calc(0px - var(--chapter-pad));height:320px;overflow:hidden;border-radius:24px 24px 0 0;background-size:cover;background-position:center;filter:brightness(.53) saturate(.83);mask-image:linear-gradient(to bottom,#000 0%,#000 36%,transparent 100%);pointer-events:none}
.chapter-motion-action{filter:brightness(.33) saturate(.76)}
.chapter-motion-integration{filter:brightness(.46) saturate(.8)}
.chapter-motion video{display:block;width:100%;height:100%;object-fit:cover}
.next-button,.previous-button{text-decoration:none}
.previous-button{color:#bad0c8;font-size:14px;font-weight:600;padding:12px 0;white-space:nowrap}
.previous-button:hover{color:#fff}
.previous-button span{margin-right:6px}
.journey-controls{position:relative;z-index:3;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:15px;margin-top:18px;padding:12px 18px;border:1px solid rgba(222,239,230,.2);border-radius:17px;background:rgba(9,31,39,.88);backdrop-filter:blur(18px);box-shadow:0 12px 32px rgba(0,0,0,.2)}
.journey-controls .next-button{justify-self:end;background:#dce9de;color:#0b2730;border:0}
.journey-controls .next-button:hover{background:#fff}
.journey-step{color:#b5cbc5;font-size:12px;letter-spacing:.15em;text-transform:uppercase;font-weight:700}
body[data-phase="action"] .chapter-topline{color:var(--warm)}
body[data-phase="integration"] .chapter-topline{color:var(--mauve)}
.closing{min-height:calc(100svh - 88px);display:flex;flex-direction:column;justify-content:center}

@media(max-width:760px){.intro{min-height:calc(100svh - 76px);padding:56px 24px 175px}.course-section{min-height:calc(100svh - 76px);padding:22px 20px 95px}.journey-header{margin-bottom:16px}.mobile-jump{display:grid;gap:6px;margin-bottom:14px}.mobile-jump label{font-size:12px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--aqua)}.mobile-jump select{width:100%;min-height:44px;padding:9px 14px;color:#edf4ed;background:#173843;border:1px solid rgba(220,235,225,.35);border-radius:12px;font:inherit}.chapter-nav{display:none}.chapter-panel{max-height:none;overflow:visible}.journey-controls{position:fixed;bottom:0;left:0;right:0;margin:0;padding:10px 13px;border-radius:0;background:rgba(9,31,39,.97)}.closing{min-height:calc(100svh - 76px)}}
@media(max-width:760px){.chapter-panel{--chapter-pad:21px}.chapter-motion{height:290px;border-radius:18px 18px 0 0}}
@media(max-width:420px){.intro{padding-top:48px;padding-bottom:176px}.journey-progress{min-width:145px;gap:3px 10px;font-size:10px}.course-section{padding-left:14px;padding-right:14px}.journey-controls{gap:7px}.journey-controls .next-button{gap:10px;padding:10px 13px}.previous-button,.next-button{font-size:13px}}
@media(max-width:420px){.chapter-panel{--chapter-pad:18px}}
@media(prefers-reduced-motion:reduce){.chapter-motion video{display:none}}

/* Visual learning inside the path */
.icon-sprite{position:absolute;width:0;height:0;overflow:hidden}
.chapter-icon{display:grid;place-items:center;color:var(--aqua)}
.chapter-icon svg,.learning-visual svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.journey-progress{grid-template-columns:1fr;width:180px;min-width:0}
.chapter-panel h3{margin-bottom:24px}
.chapter-intro{font-size:17px;margin-top:0;margin-bottom:25px}
.learning-visual{margin:0 0 27px;padding:22px 24px;border:1px solid rgba(191,222,211,.25);border-radius:18px;background:radial-gradient(circle at 78% 20%,rgba(155,199,186,.13),transparent 48%),rgba(206,231,216,.055)}
.learning-visual figcaption{margin-bottom:16px;color:#dcebe3;font-size:15px;font-weight:600;line-height:1.5}
.visual-steps{display:grid;gap:10px;align-items:stretch}
.visual-flow .visual-steps{grid-template-columns:minmax(0,1fr) 22px minmax(0,1fr) 22px minmax(0,1fr)}
.visual-paired .visual-steps{grid-template-columns:repeat(2,minmax(0,1fr))}
.visual-grid .visual-steps,.visual-layers .visual-steps{grid-template-columns:repeat(4,minmax(0,1fr))}
.visual-step{min-height:104px;padding:14px 10px;border:1px solid rgba(210,235,223,.22);border-radius:13px;background:rgba(7,27,35,.38);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:9px;text-align:center;color:#f2f4ec;font-size:14px;font-weight:600;line-height:1.4}
.visual-step svg{width:29px;height:29px;color:var(--aqua)}
.visual-connector{display:grid;place-items:center;color:var(--warm);font-size:22px}
.visual-layers .visual-step:nth-child(3) svg{color:var(--mauve)}
.visual-layers .visual-step:nth-child(4) svg{color:var(--warm)}
@media(max-width:760px){.learning-visual{padding:18px}.visual-flow .visual-steps{grid-template-columns:1fr;gap:4px}.visual-flow .visual-step{min-height:62px;flex-direction:row;justify-content:flex-start;text-align:left;padding:11px 14px;gap:13px}.visual-flow .visual-step svg{width:23px;height:23px;flex:none}.visual-flow .visual-connector{transform:rotate(90deg);font-size:18px;line-height:18px}.visual-grid .visual-steps,.visual-layers .visual-steps{grid-template-columns:repeat(2,minmax(0,1fr))}.visual-grid .visual-step,.visual-layers .visual-step,.visual-paired .visual-step{min-height:90px}.chapter-intro{font-size:16px}}