/* Only the interactive home and lessons use this sheet. Shared navigation stays intact. */
.story-page{--story-cyan:#00d1ff;--story-purple:#c1a0ff;--story-panel:rgba(16,30,47,.86);--story-ink:#f1f7fc;--story-muted:#9cacc0;color:var(--story-ink);background:radial-gradient(ellipse at 75% 5%,rgba(0,164,207,.13),transparent 40%),radial-gradient(ellipse at 0% 40%,rgba(116,74,207,.08),transparent 35%);overflow:hidden}
.story-page .container{max-width:1320px;padding-inline:28px}
.story-page h1,.story-page h2,.story-page h3{letter-spacing:-.045em;line-height:1.1;margin:0;font-weight:750}
.story-page h1{font-size:clamp(2.65rem,4.2vw,4.8rem)}
.story-page h2{font-size:clamp(1.8rem,2.7vw,3rem)}
.story-page h3{font-size:1.35rem}
.story-page em{font-style:normal;color:var(--story-cyan)}
.story-page p{line-height:1.6}
.story-page button,.story-page input,.story-page select{font:inherit}
.story-page button,.story-page a,.story-page input,.story-page select,.story-page summary{touch-action:manipulation}
.story-page :is(a,button,input,select,summary):focus-visible{outline:2px solid var(--story-cyan);outline-offset:5px}
.story-kicker{text-transform:uppercase;letter-spacing:.13em;font-size:.69rem;color:var(--story-cyan);font-weight:700;margin:0 0 22px;display:flex;align-items:center;gap:9px}
.story-kicker>span{width:7px;height:7px;background:#43e7b0;border-radius:50%;box-shadow:0 0 14px #43e7b0}
.story-hero{display:grid;grid-template-columns:.88fr 1.12fr;gap:48px;align-items:center;padding-block:46px 54px}
.story-intro{position:relative}
.story-lead{color:var(--story-muted);font-size:1.05rem;max-width:420px;margin:26px 0}
.story-intro-links{display:flex;align-items:center;flex-wrap:wrap;gap:20px}
.story-button{display:inline-flex;align-items:center;justify-content:center;gap:20px;min-height:46px;padding:12px 20px;border-radius:12px;background:var(--story-cyan);color:#042430;border:1px solid transparent;font-weight:750;font-size:.83rem;cursor:pointer;text-decoration:none;transition:background .18s,transform .18s,box-shadow .18s}
.story-button:hover{background:#7de9ff;transform:translateY(-2px);box-shadow:0 8px 28px rgba(0,209,255,.17)}
.story-text-link{color:var(--story-cyan);font-size:.82rem;font-weight:650;text-decoration:none;line-height:1.5}
.story-text-link:hover{text-decoration:underline;text-underline-offset:4px}
.story-principles{display:flex;flex-wrap:wrap;gap:14px;color:var(--story-muted);font-size:.65rem;margin-top:36px;text-transform:uppercase;letter-spacing:.045em}
.glass{border:1px solid rgba(125,211,252,.19);border-radius:24px;background:var(--story-panel);box-shadow:0 24px 80px rgba(0,0,0,.19);backdrop-filter:blur(16px)}
.experiment{padding:23px 26px;position:relative;scroll-margin-top:calc(var(--header-height) + 16px)}
.experiment::before{content:'';position:absolute;top:-1px;left:24px;width:35%;height:1px;background:linear-gradient(90deg,transparent,var(--story-cyan),transparent)}
.experiment-top,.mini-top{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:18px}
.story-tag{font-size:.61rem;letter-spacing:.08em;text-transform:uppercase;border:1px solid rgba(0,209,255,.22);padding:5px 8px;border-radius:6px;color:var(--story-cyan)}
.motion-control{display:flex;align-items:center;gap:6px;font-size:.65rem;color:var(--story-muted);cursor:pointer}
.story-page input[type=checkbox]{accent-color:var(--story-cyan);width:17px;height:17px}
.experiment h2{font-size:clamp(1.7rem,2.1vw,2.25rem)}
.experiment h2>span{color:var(--story-muted);font-weight:500}
.experiment-settings{display:grid;grid-template-columns:1fr .7fr;gap:22px;align-items:center;margin:20px 0}
.experiment-settings label{font-size:.7rem;color:var(--story-muted);display:block}
.experiment-settings output{float:right;color:var(--story-ink);font-size:.85rem;font-weight:700;font-variant-numeric:tabular-nums}
.story-page input[type=range]{display:block;width:100%;height:18px;accent-color:var(--story-cyan);margin:9px 0 0;cursor:pointer}
.story-page select{width:100%;display:block;color:var(--story-ink);background:#142436;border:1px solid rgba(125,211,252,.22);border-radius:9px;padding:10px;margin-top:8px;font-size:.75rem}
.offer-duo{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.lesson-offer{border:1px solid rgba(0,209,255,.22);border-radius:14px;padding:13px 15px;background:linear-gradient(135deg,rgba(0,209,255,.08),transparent)}
.lesson-offer.offer-b{border-color:rgba(193,160,255,.25);background:linear-gradient(135deg,rgba(193,160,255,.08),transparent)}
.offer-name{font-size:.72rem;color:var(--story-muted);display:flex;gap:8px;align-items:center}
.offer-name i{font-style:normal;display:grid;place-items:center;border-radius:5px;width:20px;height:20px;background:rgba(0,209,255,.12);color:var(--story-cyan);font-size:.65rem}
.offer-b .offer-name i{background:rgba(193,160,255,.12);color:var(--story-purple)}
.lesson-offer>strong{display:block;font-size:2.3rem;letter-spacing:-.055em;font-variant-numeric:tabular-nums;color:var(--story-cyan);line-height:1.3;margin-top:4px}
.offer-b>strong{color:var(--story-purple)}
.lesson-offer>strong span{font-size:1.15rem;margin-left:3px}
.lesson-offer p{font-size:.69rem;color:var(--story-muted);margin:1px 0 12px}
.lesson-offer output{display:block;font-size:1.15rem;font-weight:700;font-variant-numeric:tabular-nums;letter-spacing:-.02em}
.lesson-offer small{font-size:.6rem;color:var(--story-muted)}
.live-rate{display:block;font-size:.6rem;color:var(--story-cyan);margin:-6px 0 9px}
.income-chart{margin:16px 0 8px;position:relative}
.chart-heading{display:flex;justify-content:space-between;gap:12px;color:var(--story-muted);font-size:.63rem}
.income-chart svg{display:block;width:100%;height:125px;overflow:visible}
.chart-grid{stroke:rgba(135,165,192,.12);stroke-width:1}
.curve{fill:none;stroke-width:3;stroke-linecap:round;stroke-linejoin:round;vector-effect:non-scaling-stroke}
.curve-a{stroke:var(--story-cyan);filter:drop-shadow(0 0 5px rgba(0,209,255,.25))}
.curve-b{stroke:var(--story-purple)}
.dot-a{fill:var(--story-cyan)}.dot-b{fill:var(--story-purple)}
.chart-playhead{stroke:var(--story-muted);stroke-width:1;stroke-dasharray:3 5;opacity:.4}
.chart-legend{display:flex;gap:20px;color:var(--story-muted);font-size:.62rem}
.chart-legend span{display:flex;gap:6px;align-items:center}.chart-legend i{width:12px;height:3px;border-radius:3px;background:var(--story-cyan)}.chart-legend .legend-b{background:var(--story-purple)}
.timeline-controls{display:flex;gap:12px;align-items:center;margin-top:17px;flex-wrap:wrap}
.timeline-controls .story-button{min-height:40px;padding:10px 15px;font-size:.75rem}
.story-quiet{border:0;background:none;color:var(--story-muted);padding:10px 3px;font-size:.7rem;cursor:pointer}
.story-quiet:hover{color:var(--story-ink)}
.time-scrubber{display:block;font-size:.6rem;color:var(--story-muted);margin-top:12px}
.experiment-result{font-size:.78rem;color:var(--story-ink);padding:11px 13px;border-left:2px solid var(--story-cyan);background:rgba(0,209,255,.045);margin:15px 0 8px;min-height:58px}
.story-page .lesson-assumption{font-size:.62rem;color:var(--story-muted);line-height:1.5;margin:10px 0 0}
.story-chapter{padding-block:48px;border-top:1px solid rgba(125,211,252,.11)}
.chapter-heading{margin-bottom:28px;max-width:720px}
.chapter-heading .story-kicker{margin-bottom:12px}
.chapter-heading>p:last-child{color:var(--story-muted);font-size:.9rem;max-width:520px;margin-top:16px}
.chapter-heading.horizontal{display:flex;max-width:none;align-items:end;justify-content:space-between;gap:20px}
.mechanics-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.mechanics-grid>section{padding:24px}
.mini-top>span:last-child{font-size:1.5rem;color:var(--story-cyan)}
.rate-equation{display:flex;align-items:center;gap:18px;min-height:85px;font-size:2rem;letter-spacing:-.04em;font-variant-numeric:tabular-nums}
.rate-equation>span:nth-child(2){font-size:1rem;color:var(--story-cyan)}
.rate-equation>strong{margin-left:auto;font-size:3rem;color:var(--story-cyan);transition:color .2s}
.story-switch{display:flex;align-items:center;gap:9px;flex-wrap:wrap;font-size:.78rem;cursor:pointer;padding:12px 0;border-block:1px solid rgba(125,211,252,.12)}
.story-switch small{color:var(--story-muted);margin-left:auto;font-size:.68rem}
.mechanics-grid p{font-size:.82rem;color:var(--story-muted);min-height:42px;margin:14px 0}
.balance-visual{display:flex;gap:8px;align-items:end;min-height:85px;margin-bottom:8px}
.balance-visual>div{width:50%;border-radius:8px;padding:10px;background:rgba(0,209,255,.14);transition:height .4s ease,background .4s;height:75px}
.balance-visual span{display:block;font-size:.62rem;color:var(--story-muted)}.balance-visual b{font-size:1.25rem;font-variant-numeric:tabular-nums}
.mini-balance.is-withdrawn .balance-after{height:46px;background:rgba(193,160,255,.16)}
.lesson-entrances{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.lesson-entrances>a{position:relative;text-decoration:none;color:var(--story-ink);border:1px solid rgba(125,211,252,.15);border-radius:18px;padding:22px;background:linear-gradient(150deg,rgba(17,39,57,.8),rgba(10,20,35,.6));transition:border-color .2s,transform .2s;overflow:hidden}
.lesson-entrances>a:hover{border-color:var(--story-cyan);transform:translateY(-4px)}
.lesson-number{font-family:var(--font-mono);font-size:.75rem;color:var(--story-muted)}
.entrance-art{height:76px;display:flex;align-items:end;gap:7px;padding:14px 0;margin:3px 0 10px}
.entrance-art i{height:16px;width:22%;border-radius:5px 5px 0 0;background:linear-gradient(0deg,rgba(0,209,255,.1),rgba(0,209,255,.7));transition:height .35s}
.art-rate i:nth-child(2){height:26px}.art-rate i:nth-child(3){height:36px}.art-rate i:nth-child(4){height:46px}
.art-time i:nth-child(2){height:32px}.art-time i:nth-child(3){height:40px}.art-time i:nth-child(4){height:44px}
.art-withdraw i:nth-child(-n+2){height:45px}.art-withdraw i:nth-child(n+3){height:15px;background:linear-gradient(0deg,rgba(193,160,255,.1),rgba(193,160,255,.7))}
.lesson-entrances>a:hover .art-rate i{height:45px}
.lesson-entrances p{font-size:.81rem;color:var(--story-muted);margin:12px 0 24px}
.entrance-action{font-size:.73rem;color:var(--story-cyan);font-weight:650}
.period-entrances{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.period-entrances>a{padding:22px;border-radius:16px;border:1px solid rgba(125,211,252,.15);text-decoration:none;color:var(--story-ink);background:var(--story-panel);transition:border-color .2s}
.period-entrances>a:hover{border-color:var(--story-cyan)}
.period-entrances>a>span{font-size:.68rem;color:var(--story-muted)}
.period-entrances strong{font-size:3rem;display:block;letter-spacing:-.06em;color:var(--story-cyan);margin-top:5px}.period-entrances small{font-size:.9rem;letter-spacing:0;color:var(--story-ink)}
.period-entrances p{font-size:.73rem;color:var(--story-muted);margin:5px 0 18px}.period-entrances b{font-size:.72rem;font-weight:650}
.tool-ribbon{display:flex;gap:20px;align-items:center;justify-content:space-between;padding:24px;border:1px solid rgba(0,209,255,.24);border-radius:16px;margin-top:20px;background:linear-gradient(90deg,rgba(0,209,255,.07),rgba(193,160,255,.03))}
.tool-ribbon strong{font-size:1rem}.tool-ribbon p{color:var(--story-muted);font-size:.8rem;margin:5px 0 0}
.catalog-inline{display:flex;flex-wrap:wrap;gap:26px;margin-top:18px;font-size:.78rem}.catalog-inline a{color:var(--story-muted);text-decoration:none}.catalog-inline a:hover{color:var(--story-cyan)}
.story-proof{display:grid;grid-template-columns:1fr 1fr;gap:42px;padding-bottom:64px}.story-proof h2{margin-bottom:24px}
.proof-list>div{display:flex;gap:18px;padding:18px 0;border-bottom:1px solid rgba(125,211,252,.12)}.proof-list b{color:var(--story-cyan);font-size:.7rem;font-family:var(--font-mono);padding-top:4px}.proof-list p{margin:0}.proof-list strong{display:block;font-size:.9rem}.proof-list span{display:block;color:var(--story-muted);font-size:.8rem;margin-top:4px}
.learn-header{padding-block:40px 28px;max-width:850px}.learn-header h1{font-size:clamp(2.3rem,4vw,4rem)}.learn-header>p{color:var(--story-muted);max-width:640px;font-size:.95rem}.learn-breadcrumbs{display:flex;gap:10px;color:var(--story-muted);font-size:.72rem;margin-bottom:24px}.learn-breadcrumbs a{color:var(--story-muted)}
.lesson-tabs{display:flex;gap:8px;flex-wrap:wrap;margin:0 0 28px}.lesson-tabs a{padding:12px 16px;border:1px solid rgba(125,211,252,.17);border-radius:10px;color:var(--story-muted);font-size:.78rem;text-decoration:none}.lesson-tabs a[aria-current=true]{color:var(--story-cyan);border-color:var(--story-cyan);background:rgba(0,209,255,.07)}
.learn-settings{display:flex;align-items:center;flex-wrap:wrap;gap:22px;padding:16px 22px;margin-bottom:28px}.learn-settings>label:first-child{flex:1;min-width:180px}.learn-settings label{font-size:.75rem;color:var(--story-muted)}.learn-settings output{margin-left:12px;color:var(--story-ink);font-weight:700}.learn-settings select{min-width:180px}
.lesson-panel{scroll-margin-top:calc(var(--header-height) + 18px);padding:28px;margin-bottom:30px}.lesson-panel h2{margin-bottom:10px}.lesson-panel>.lesson-intro{color:var(--story-muted);font-size:.9rem;max-width:670px}.lesson-workspace{display:grid;grid-template-columns:.8fr 1.2fr;gap:32px;margin-top:24px}.lesson-rule-controls .story-switch{padding:16px 0}.lesson-rule-controls .story-switch small{display:block;width:100%;margin-left:26px}.rate-tower{display:flex;gap:7px;align-items:end;height:110px;margin-bottom:20px}.rate-tower>div{flex:1;border-radius:8px 8px 0 0;display:flex;flex-direction:column;justify-content:end;padding:9px;background:rgba(0,209,255,.15);border:1px solid rgba(0,209,255,.2);font-size:.75rem;transition:height .3s,opacity .3s}.rate-tower>div:not(:first-child){background:rgba(193,160,255,.12);border-color:rgba(193,160,255,.2)}.rate-tower small{font-size:.58rem;color:var(--story-muted);margin-top:4px}.rate-tower .inactive{opacity:.3}
.lesson-stat-row{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-bottom:18px}.lesson-stat-row>div{padding:12px;border-radius:10px;border:1px solid rgba(125,211,252,.13)}.lesson-stat-row span{display:block;font-size:.61rem;color:var(--story-muted)}.lesson-stat-row strong{display:block;font-size:1.25rem;font-variant-numeric:tabular-nums;margin-top:5px}
.rate-tower{height:145px;padding-bottom:24px}.rate-tower>div{position:relative;padding:0;border-width:0;min-height:0}.rate-tower strong{position:absolute;top:-23px;left:5px;font-size:.75rem;white-space:nowrap}.rate-tower small{position:absolute;bottom:-22px;left:5px;white-space:nowrap}
.lesson-details{margin-top:22px;border-top:1px solid rgba(125,211,252,.15);padding-top:15px;font-size:.8rem;color:var(--story-muted)}.lesson-details summary{color:var(--story-ink);cursor:pointer;padding:5px 0}.lesson-details p{margin-top:14px}.lesson-details a{color:var(--story-cyan)}
.lesson-table{width:100%;border-collapse:collapse;font-size:.78rem;margin-top:14px}.lesson-table th,.lesson-table td{padding:10px;text-align:left;border-bottom:1px solid rgba(125,211,252,.15)}.lesson-table th{color:var(--story-muted);font-weight:500}.lesson-table-wrap{overflow-x:auto}
.withdraw-controls label{display:block;color:var(--story-muted);font-size:.8rem;margin:18px 0}.withdraw-controls output{color:var(--story-ink);float:right}.withdraw-event{padding:16px;border:1px solid rgba(193,160,255,.2);border-radius:12px;font-size:.8rem;margin-top:18px}.withdraw-event strong{color:var(--story-purple)}
[data-story-only]{display:none}.story-ready [data-story-only]{display:block}.story-ready .lesson-fallback{display:none}
:root[data-theme=light] .story-page{--story-panel:rgba(239,248,252,.9);--story-ink:#133146;--story-muted:#4e687c;--story-cyan:#007a9f;--story-purple:#7955ba}
:root[data-theme=light] .story-page select{background:#f4fbff}:root[data-theme=light] .glass{box-shadow:0 20px 60px rgba(32,75,105,.08)}:root[data-theme=light] .lesson-entrances>a{background:linear-gradient(150deg,#edf8fd,#f7faff)}
@media(min-width:1500px){.story-hero{gap:70px;padding-block:56px 60px}}
@media(max-width:1000px){.story-hero{gap:24px;grid-template-columns:.8fr 1.2fr}.story-intro-links{gap:15px}.story-principles{flex-direction:column;gap:8px}.experiment{padding:20px}.lesson-workspace{gap:20px}}
@media(max-width:760px){.story-page .container{padding-inline:18px}.story-hero{grid-template-columns:1fr;padding-block:28px 32px;gap:25px}.story-lead{max-width:550px;margin:17px 0}.story-intro h1 br{display:none}.story-principles{display:none}.story-chapter{padding-block:32px}.mechanics-grid,.story-proof,.lesson-workspace{grid-template-columns:1fr}.chapter-heading.horizontal{align-items:start;flex-direction:column;gap:12px}.lesson-entrances{grid-template-columns:1fr}.lesson-entrances>a{padding:18px 18px 18px 96px;min-height:158px}.lesson-number{position:absolute;left:20px;top:20px}.entrance-art{position:absolute;left:18px;top:45px;width:60px;height:60px}.lesson-entrances h3{font-size:1.2rem}.lesson-entrances p{margin:8px 0 12px}.period-entrances{gap:8px}.period-entrances>a{padding:14px 10px}.period-entrances strong{font-size:2.2rem}.period-entrances small{display:block;font-size:.72rem}.period-entrances>a>span{font-size:.58rem}.period-entrances p{font-size:.6rem}.period-entrances b{font-size:.62rem}.tool-ribbon{align-items:start;flex-direction:column;padding:18px}.story-proof{gap:14px}.learn-header{padding-block:28px 20px}.lesson-panel{padding:20px}.lesson-tabs{gap:6px}.lesson-tabs a{flex:1;padding:11px 9px;font-size:.69rem;text-align:center}.lesson-stat-row{gap:6px}.lesson-stat-row>div{padding:9px}.lesson-stat-row strong{font-size:1rem}.learn-settings{gap:14px;padding:16px}.learn-settings>label{width:100%}.learn-settings .motion-control{width:auto}}
@media(max-width:400px){.story-page .container{padding-inline:14px}.experiment{padding:17px 14px}.experiment-settings{gap:12px}.lesson-offer{padding:12px 10px}.offer-name{font-size:.67rem}.lesson-offer p{font-size:.61rem;min-height:30px}.lesson-offer output{font-size:1rem}.story-tag{font-size:.55rem}.motion-control{font-size:.59rem}.timeline-controls{gap:9px}.timeline-controls .story-button{padding-inline:11px}.story-page h1{font-size:2.55rem}}
@media(prefers-reduced-motion:reduce){.story-page *{scroll-behavior:auto!important;animation:none!important;transition:none!important}.story-page .curve{filter:none}}
.story-page.motion-off *{animation:none!important;transition:none!important}

/* Owner-supplied paired glass artwork. Scoped to home; other pages keep their backgrounds. */
.story-home{--hero-art:url('../img/backgrounds/story-glass-dark.webp');--hero-ground:#0b1220;--hero-veil:rgba(6,14,29,.13);position:relative;isolation:isolate}
.story-home::before{content:'';position:absolute;z-index:-1;inset:0 0 auto;height:1120px;pointer-events:none;background-image:linear-gradient(180deg,var(--hero-veil) 0%,transparent 45%,var(--hero-ground) 100%),var(--hero-art);background-size:cover;background-position:center top;background-repeat:no-repeat}
.story-home .experiment{--story-muted:#b4c6d8;background:linear-gradient(135deg,rgba(166,220,255,.08),rgba(97,143,208,.025)),rgba(11,25,43,.56);border-color:rgba(193,223,255,.32);box-shadow:inset 0 1px 0 rgba(230,246,255,.17),inset 1px 0 0 rgba(206,233,255,.08),0 28px 70px rgba(2,9,22,.28);backdrop-filter:blur(24px) saturate(120%);-webkit-backdrop-filter:blur(24px) saturate(120%)}
.story-home .lesson-offer{background:linear-gradient(135deg,rgba(0,209,255,.08),rgba(8,24,42,.16))}
.story-home .lesson-offer.offer-b{background:linear-gradient(135deg,rgba(193,160,255,.09),rgba(8,24,42,.16))}
.story-home .story-lead{color:#c2d1e1}
:root[data-theme=light] .story-home{--hero-art:url('../img/backgrounds/story-glass-light.webp');--hero-ground:#edf3fa;--hero-veil:rgba(244,249,255,.06);background:linear-gradient(180deg,#edf3fa,#f4f8fc)}
:root[data-theme=light] .story-home .experiment{--story-muted:#405873;background:linear-gradient(135deg,rgba(255,255,255,.35),rgba(239,246,255,.06)),rgba(242,248,255,.52);border-color:rgba(255,255,255,.85);box-shadow:inset 0 1px 0 rgba(255,255,255,.92),inset 1px 0 0 rgba(255,255,255,.6),0 24px 65px rgba(34,67,114,.14)}
:root[data-theme=light] .story-home .lesson-offer{background:rgba(246,252,255,.32);border-color:rgba(0,111,157,.22)}
:root[data-theme=light] .story-home .lesson-offer.offer-b{background:rgba(248,245,255,.32);border-color:rgba(108,79,172,.23)}
:root[data-theme=light] .story-home .story-button{color:#fff}
:root[data-theme=light] .story-home .story-button:hover{background:#006b90;color:#fff}
:root[data-theme=light] .story-home .story-lead{color:#405873}
@media(max-width:760px){.story-home::before{height:1450px;background-position:50% top}.story-home .experiment{backdrop-filter:blur(18px) saturate(115%);-webkit-backdrop-filter:blur(18px) saturate(115%);background-color:rgba(11,25,43,.66)}:root[data-theme=light] .story-home .experiment{background-color:rgba(242,248,255,.65)}}