:root{color-scheme:dark;font:16px/1.5 system-ui,sans-serif;background:#07162a;color:#edf7ff}*{box-sizing:border-box}body{max-width:1320px;margin:auto;padding:24px}h1{font-size:clamp(26px,4vw,40px);line-height:1.15;margin:10px 0}h2{font-size:21px;margin:10px 0 16px}h3{font-size:18px}header{display:flex;gap:20px;align-items:center;justify-content:space-between;padding:12px 0 24px}.badge{font-size:12px;letter-spacing:.15em;color:#65d2ff}.panel{background:#0d243d;border:1px solid #2a506e;border-radius:18px;padding:20px;margin-bottom:20px}.grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.6fr);gap:20px}.toolbar,.controls{display:flex;align-items:center;gap:10px;flex-wrap:wrap}label{display:block;font-size:14px;color:#c6d8eb;margin:8px 0}input,select,button{font:inherit;color:inherit;max-width:100%;background:#153b5b;border:1px solid #507791;border-radius:9px;padding:9px;min-height:44px}button,.file-button{cursor:pointer}button:hover{background:#215676}button:disabled{opacity:.5;cursor:default}button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #79deff;outline-offset:3px}label>input:not([type=checkbox]),label>select{display:block;margin-top:5px}input[type=number]{width:105px}input[type=range]{width:100%;min-height:24px;padding:0}input[type=checkbox]{min-height:20px;width:20px;vertical-align:middle;margin-right:6px}p{color:#bfd1e3}.muted,small,.storage-note{font-size:13px;color:#afc7dd}.track,.phase{border:1px solid #315676;padding:14px;margin:12px 0;border-radius:12px}.track{background:#102e49}.track strong{overflow-wrap:anywhere}.track .controls button{font-size:14px}.warning{color:#ffd48a}.missing{border-color:#ca8b48}.file-button{padding:10px;background:#123453;border-radius:10px;border:1px solid #47718e}.file-button input{width:100%;border:0;background:transparent;padding:5px 0}.player strong{font-size:20px}#seek{width:100%}#status{padding:12px 16px;border-left:3px solid #35b7e8;background:#0c2239}dialog{max-width:700px;width:calc(100% - 24px);max-height:90vh;overflow:auto;border:1px solid #57bde7;border-radius:18px;background:#0c253f;color:#edf7ff;padding:24px}dialog::backdrop{background:#000a}#heart-value{font-size:24px}#heart-feedback{min-height:24px}[hidden]{display:none!important}@media(max-width:760px){body{padding:12px}.grid{grid-template-columns:1fr}.panel{padding:14px}header{display:block}header>button{margin-top:10px}button{min-height:46px}.toolbar{gap:8px}.toolbar>label{max-width:100%}}

.phase-heading{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}.phase-heading h3{margin:4px 0}.phase-heading button{font-size:14px;flex-shrink:0}

/* Spinning Energy: shared controls and behavior retain their original IDs. */
:root{font-family:Inter,-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;background:#090c10;color:#f7f7fb;--pink:#ff168e;--orange:#ff641e;--muted:#aab1bf;--line:#29303b;scroll-behavior:smooth;scroll-padding-top:24px}
body{max-width:none;padding:0;margin:0;background:radial-gradient(ellipse at 85% 0,#4a102520,transparent 40%),#090c10}
.pink{color:var(--pink)}
.energy-sidebar{position:fixed;inset:0 auto 0 0;width:222px;padding:30px 17px;display:flex;flex-direction:column;background:linear-gradient(180deg,#0d1118,#090c11);border-right:1px solid #222633;z-index:20;overflow-y:auto}
.energy-brand{display:flex;flex-direction:column;align-items:center;gap:13px;text-decoration:none;color:#f8f8fb;font-size:17px;font-weight:750;padding:0 0 30px}
.energy-brand img{width:76px;height:76px;filter:drop-shadow(0 0 18px #ff168e55)}
.energy-brand strong{font-size:20px;letter-spacing:.22em}
.energy-sidebar nav{display:grid;gap:8px}.energy-sidebar nav a{display:flex;align-items:center;gap:12px;min-height:50px;padding:12px;border:1px solid transparent;border-radius:12px;color:#b9bfcb;text-decoration:none;font-size:21px;transition:background .2s,border-color .2s}.energy-sidebar nav a span{font-size:13px;font-weight:650}.energy-sidebar nav a:hover,.energy-sidebar nav a:focus-visible{background:#ff168e16;border-color:#ff168e77;color:#ff58b1}.energy-sidebar nav a:first-child{background:linear-gradient(90deg,#ff168e24,#ff168e07);color:#ff58b1;border-left:3px solid var(--pink)}
.sidebar-motto{margin-top:auto;padding-top:60px;font-size:11px;letter-spacing:.3em;line-height:2;color:#aab0bf}.energy-version{font-size:10px;letter-spacing:.2em;color:#fc429e}
.energy-main{margin-left:222px;padding:0 30px 30px;max-width:1700px}
.energy-hero{position:relative;isolation:isolate;min-height:330px;padding:43px 0 30px;overflow:hidden;margin-bottom:14px;border-bottom:1px solid #ff168e22;display:flex;align-items:center}
.hero-copy{position:relative;z-index:2;max-width:640px}.badge{font-size:10px;letter-spacing:.21em;color:#e199bf;font-weight:750}.energy-hero h1{font-size:clamp(38px,4.5vw,74px);letter-spacing:-.055em;font-weight:850;line-height:1.02;margin:17px 0}.energy-hero h1 span{color:var(--pink);background:linear-gradient(90deg,var(--pink),var(--orange));background-clip:text;-webkit-background-clip:text;-webkit-text-fill-color:transparent}.energy-hero p{font-size:15px;color:#bdc0ce}.hero-art{position:absolute;right:-6%;width:61%;height:100%;top:0;z-index:0;pointer-events:none;background:radial-gradient(ellipse,#ff168e22,transparent 68%)}
.energy-wave{position:absolute;inset:20% 0;display:flex;align-items:center;justify-content:center;gap:4px;transform:rotate(-9deg);opacity:.5;filter:drop-shadow(0 0 10px #ff168e)}.energy-wave i{width:4px;flex:1;max-width:7px;height:var(--h);background:linear-gradient(#ff168e,#ff641e);border-radius:10px}.hero-bike{position:absolute;width:100%;height:100%;right:-5%;filter:drop-shadow(0 0 10px #ff168e88);opacity:.8}
.panel{background:linear-gradient(140deg,#12171ff5,#0c1017f5);border:1px solid #2a303c;border-radius:19px;padding:22px;box-shadow:0 12px 30px #0002;margin-bottom:20px;min-width:0}
h2{font-size:18px;font-weight:700;letter-spacing:-.02em}h3{font-size:16px}p{color:#b8bfcd}.muted,small,.storage-note{color:#a5adbd;line-height:1.65}.storage-note{font-size:11px;max-width:1050px}label{color:#c5c9d5;font-size:12px}
button,input,select{background:#171d28;border-color:#3e4655;color:#f1f2f8;border-radius:10px;font-size:13px;accent-color:var(--pink)}button{padding:10px 14px;font-weight:650;transition:background .2s,border-color .2s}button:hover:not(:disabled){background:#392036;border-color:#fc429e}button:disabled{opacity:.45}button:focus-visible,input:focus-visible,select:focus-visible,a:focus-visible{outline:2px solid #ff70bd;outline-offset:4px}
#guide,#save,#preview,#heart-connect{background:linear-gradient(110deg,#ec087b,#ff239b);border-color:#ff399f;color:#fff;box-shadow:0 5px 22px #ff168e20}#guide{margin-top:10px}#full,#auto-lesson{border-color:#ff6b4180;background:#ff641e14;color:#ffb18c}#apply{border-color:#ff168e66}.file-button{background:#ff168e09;border:1px dashed #9f3974;color:#eab6d4}.file-button input{font-size:12px}input[type=file]::file-selector-button{border:0;border-radius:6px;background:#42223d;color:#ffe7f6;padding:8px;cursor:pointer}
.project-toolbar{gap:12px;align-items:end}.project-toolbar label{margin:0}.project-toolbar input#name{width:180px}.project-toolbar select{max-width:200px}.project-toolbar>.file-button{max-width:210px}.toolbar button{flex-shrink:0}
#status{border-left-color:var(--pink);background:#ff168e09;color:#eac3d9;font-size:13px;border-radius:0 10px 10px 0}
.grid{grid-template-columns:minmax(0,1fr) minmax(270px,330px);align-items:start;gap:20px}.library-panel{grid-column:2;grid-row:1}.timeline-panel{grid-column:1;grid-row:1}.library-panel>h2:not(:first-child){border-top:1px solid var(--line);padding-top:26px;margin-top:28px}.library-panel label>select{width:100%}
.section-heading h2{font-size:23px;margin-top:8px}.phase-strip{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:8px;margin:20px 0}.phase-strip a{display:flex;flex-direction:column;gap:8px;align-items:center;justify-content:center;padding:13px 5px;text-decoration:none;text-align:center;min-width:0;min-height:85px;border-radius:11px;border:1px solid #c02a9380;background:#ff168e0b;color:#f4ddeb;font-size:10px}.phase-strip b{display:grid;place-items:center;border:1px solid currentColor;border-radius:50%;width:24px;height:24px;font-size:10px;color:#ff59b2}.phase-strip a:nth-child(3),.phase-strip a:nth-child(4){border-color:#f7653580;background:#ff641e0b}.phase-strip a:nth-child(3) b,.phase-strip a:nth-child(4) b{color:#ff8b4b}.phase-strip a:nth-child(5){border-color:#dcab4180}.phase-strip a:nth-child(5) b{color:#f5ca65}
.phase{background:#0b1017;border:1px solid #30313e;border-left:3px solid #ce277c;padding:17px;border-radius:13px;margin:16px 0}.phase:nth-child(3),.phase:nth-child(4){border-left-color:#ff641e}.phase:nth-child(5){border-left-color:#ddad50}.phase-heading button{border-radius:30px;color:#ff8bc7;border-color:#bd337984;background:#ff168e0b}.phase>small{font-size:11px}.phase>p{font-size:12px;margin:8px 0}.warning{color:#ffc27d}.track{background:#151a24;border-color:#303747;padding:14px;margin:10px 0;border-radius:11px}.track strong{font-size:14px}.track p{font-size:12px}.track .controls{gap:8px}.track .controls button{font-size:12px}.track input[type=number]{width:88px}.track .controls label{margin:0}.track>button{margin:5px 5px 0 0}.track>select{margin-right:6px}.track small{font-size:10px}
.player{position:relative;border-color:#64304b;background:linear-gradient(110deg,#17121d,#111720);padding:18px 22px}.player strong{display:block;margin-top:14px;font-size:17px}.player .toolbar{gap:10px}.player>p.muted{font-size:11px;margin-bottom:0}.player #clock{color:#ff8bc7;font-size:13px;font-variant-numeric:tabular-nums}.player #volume{width:130px}#heart-value{color:#ff61b3;font-size:25px}#heart-panel{scroll-margin-top:20px}#heart-status{font-size:12px}#heart-feedback{font-size:12px}
.strava-panel{border-top:1px solid var(--line);margin-top:30px;padding-top:24px}.strava-panel h2{color:#ff7b40;letter-spacing:.13em}.strava-panel button{width:100%;background:#ff641e12;border-color:#ff641e55}.strava-panel p{font-size:12px}
dialog{background:#111720;border-color:#f3349580;box-shadow:0 24px 100px #000b;color:#faf6fa}dialog::backdrop{background:#04060bc9;backdrop-filter:blur(8px)}
@media(min-width:1750px){.energy-main{margin-right:auto}}
@media(max-width:1200px){.energy-sidebar{width:185px;padding:25px 12px}.energy-brand{font-size:14px}.energy-main{margin-left:185px;padding:0 20px 25px}.grid{grid-template-columns:minmax(0,1fr) minmax(240px,280px);gap:15px}.phase-strip{grid-template-columns:repeat(3,minmax(0,1fr))}.hero-art{right:-14%;width:67%;opacity:.65}.panel{padding:17px}}
@media(max-width:960px){.grid{grid-template-columns:minmax(0,1fr)}.timeline-panel{grid-column:1;grid-row:1}.library-panel{grid-column:1;grid-row:2}.energy-hero h1{font-size:48px}.energy-hero{min-height:300px}.hero-art{opacity:.35}.energy-sidebar{width:168px}.energy-main{margin-left:168px;padding:0 16px 20px}.energy-brand>span{font-size:12px}.energy-sidebar nav a span{font-size:12px}.energy-brand img{width:62px;height:62px}}
@media(max-width:650px){:root{scroll-padding-top:15px}.energy-sidebar{width:62px;padding:16px 5px}.energy-brand{padding-bottom:20px}.energy-brand img{width:42px;height:42px}.energy-brand>span,.energy-brand>strong,.energy-sidebar nav a span,.sidebar-motto,.energy-version{display:none}.energy-sidebar nav a{justify-content:center;padding:8px 0;font-size:24px;min-height:46px}.energy-main{margin-left:62px;padding:0 12px 20px}.energy-hero{min-height:270px;padding:28px 0 24px}.energy-hero h1{font-size:clamp(30px,7.4vw,48px)}.hero-copy p{font-size:12px;max-width:220px}.hero-art{width:100%;right:-28%;opacity:.3}.badge{font-size:8px}.panel{padding:14px;border-radius:14px}.project-toolbar{display:grid;grid-template-columns:minmax(0,1fr);gap:10px}.project-toolbar>*{width:100%;max-width:none!important}.project-toolbar input#name,.project-toolbar select{width:100%;max-width:100%}.toolbar{align-items:stretch}.toolbar>button{white-space:normal;flex:1 1 110px;min-width:0}.toolbar>label{min-width:0}.phase-strip{gap:6px}.phase-strip a{font-size:9px;padding:10px 3px;min-height:80px}.phase-heading{gap:8px}.phase-heading button{font-size:11px}.section-heading h2{font-size:20px}.controls{align-items:stretch}.controls>button{flex:1 1 90px}.track{padding:11px}.track .controls input{max-width:100%}.player{padding:14px}.player strong{font-size:14px}.player #volume{width:100%}.player .toolbar>label{flex:1 1 100%}.energy-sidebar a:focus-visible{outline-offset:-2px}dialog{padding:18px}}
@media(prefers-reduced-motion:reduce){:root{scroll-behavior:auto}*{transition:none!important}}


/* Photorealistic modern indoor bike, with no changes to lesson controls. */
.hero-art .energy-wave{opacity:.15}
.hero-bike-modern{position:absolute;inset:0;width:100%;height:100%;object-fit:contain;object-position:center right;mix-blend-mode:screen;filter:none}
@media(min-width:961px){.hero-art{right:-2%;width:57%;opacity:1}.energy-hero .hero-copy{max-width:58%}}
@media(max-width:960px) and (min-width:651px){.hero-art{right:-6%;width:64%;opacity:.6}}
@media(max-width:650px){.energy-hero .hero-art{position:relative;right:auto;top:auto;width:100%;height:190px;opacity:1;margin-top:6px}.energy-hero{display:block;padding-bottom:12px}.hero-bike-modern{object-position:center}.hero-copy{max-width:100%}}

/* Approved full-width Energy artwork; retain semantic text and a real guide button. */
.energy-hero.energy-hero-full{display:block;min-height:0;padding:0;margin:18px 0 20px;border:1px solid #ff168e33;border-radius:18px;overflow:hidden}
.energy-banner-image{display:block;width:100%;height:auto}
.energy-hero-full .hero-copy{position:absolute;inset:0;max-width:none!important;z-index:2}
.energy-hero-full .hero-copy>.badge,.energy-hero-full .hero-copy>h1,.energy-hero-full .hero-copy>p{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;margin:0;padding:0}
.energy-hero-full #guide{position:absolute;left:5.25%;top:64.4%;width:24.5%;height:10.6%;min-height:0;margin:0;padding:0;background:transparent;border:0;border-radius:100px;box-shadow:none;color:transparent;font-size:0}
.energy-hero-full #guide:focus-visible{outline:3px solid #fff;outline-offset:4px}
.energy-hero-full #guide:hover{background:#ffffff12}
@media(max-width:650px){.energy-hero.energy-hero-full{padding:0 0 12px;margin-top:12px;border-radius:12px}.energy-hero-full .hero-copy{position:static}.energy-hero-full #guide{position:static;display:block;width:calc(100% - 24px);height:auto;min-height:46px;margin:12px auto 0;padding:10px;background:linear-gradient(110deg,#ec087b,#ff239b);color:#fff;font-size:12px}.energy-hero-full #guide:hover{background:#d71078}}