:root{--midnight:#0f172a;--midnight-2:#1e1b4b;--violet:#7c3aed;--violet-dark:#6d28d9;--lilac:#a78bfa;--cyan:#22d3ee;--cyan-dark:#0891b2;--lavender:#ede9fe;--bg:#f5f3ff;--paper:#fff;--rose:#f43f5e;--rose-soft:#fff1f2;--cyan-soft:#ecfeff;--violet-soft:#f3efff;--slate:#94a3b8;--line:#e4defb;--text:#0f172a;--muted:#64748b;--radius:18px;--shadow:0 1px 2px #0f172a0a, 0 6px 20px #7c3aed14;--shadow-hover:0 10px 30px #7c3aed29;--glow:linear-gradient(135deg, var(--violet), var(--cyan));--font:"Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;--navy:var(--midnight);--navy-2:var(--midnight-2);--cream:var(--bg);--amber:var(--violet);--amber-dark:var(--violet-dark);--amber-soft:var(--violet-soft);--teal:var(--cyan-dark);--teal-soft:var(--cyan-soft);--coral:var(--rose);--coral-soft:var(--rose-soft);--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}html,body{margin:0}body{background:var(--bg);color:var(--text);font-family:var(--font);-webkit-font-smoothing:antialiased;font-size:17px;line-height:1.6}a{color:inherit}img{max-width:100%;display:block}h1,h2,h3{font-family:var(--font);letter-spacing:-.02em;margin:0 0 .5em;font-weight:800;line-height:1.2}h1{font-size:1.65rem}h2{font-size:1.25rem}h3{font-size:1.05rem}p{margin:0 0 1em}strong,b{font-weight:700}button{font:inherit;cursor:pointer}.app{max-width:600px;min-height:100vh;margin:0 auto;padding-bottom:96px}.page{padding:20px 16px 32px}.muted{color:var(--muted)}.small{font-size:.9rem}.eyebrow{letter-spacing:.08em;text-transform:uppercase;color:var(--violet);font-size:.74rem;font-weight:800}.row{align-items:center;gap:12px;display:flex}.spread{justify-content:space-between}.stack>*+*{margin-top:12px}.grid2{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;display:grid}.center{text-align:center}.big-number{font-size:2rem;font-weight:800;line-height:1.1}.gradient-text{background:var(--glow);color:#0000;-webkit-background-clip:text;background-clip:text}.topbar{z-index:10;background:var(--midnight);color:#fff;border-bottom:1px solid #a78bfa2e;align-items:center;gap:10px;padding:12px 16px;display:flex;position:sticky;top:0}.topbar .brand{letter-spacing:-.02em;font-size:1.05rem;font-weight:800}.topbar .brand span{color:var(--cyan)}.topbar .right{color:var(--cyan);margin-left:10px;font-size:.9rem;font-weight:800}.btn{background:linear-gradient(135deg, var(--violet), var(--violet-dark));color:#fff;border:0;border-radius:14px;justify-content:center;align-items:center;gap:8px;min-height:52px;padding:12px 22px;font-size:1rem;font-weight:800;text-decoration:none;transition:transform 80ms,box-shadow .15s;display:inline-flex;box-shadow:0 6px 18px #7c3aed59}.btn:active{transform:translateY(1px);box-shadow:0 2px 8px #7c3aed4d}.btn:disabled{opacity:.45;cursor:not-allowed;box-shadow:none}.btn.amber{background:linear-gradient(135deg, var(--violet), var(--violet-dark));color:#fff}.btn.navy{background:var(--midnight);color:#fff;box-shadow:0 6px 18px #0f172a40}.btn.ghost{color:var(--violet);border:2px solid var(--lavender);box-shadow:none;background:#fff}.btn.block{width:100%}.link-btn{color:var(--violet);background:0 0;border:0;padding:0;font-weight:700;text-decoration:underline}.card{background:var(--paper);border-radius:var(--radius);box-shadow:var(--shadow);padding:16px}.card.amber,.card.teal,.card.coral{border-left:5px solid var(--violet)}.card.teal{border-left-color:var(--cyan)}.card.coral{border-left-color:var(--rose)}.card.amber .eyebrow{color:var(--violet)}.card.teal .eyebrow{color:var(--cyan-dark)}.card.coral .eyebrow{color:var(--rose)}.card.navy{background:radial-gradient(circle at 100% 0%, #7c3aed73, transparent 55%), var(--midnight);color:#fff;border:0}.card.navy .muted{color:#cbd5e1}.card.navy .eyebrow{color:var(--cyan)}.card-link{text-decoration:none;display:block}.tile{background:var(--paper);border-radius:var(--radius);box-shadow:var(--shadow);text-decoration:none;display:block;overflow:hidden}.tile .tile-body{padding:14px 16px}.list-row{background:var(--paper);border-radius:var(--radius);box-shadow:var(--shadow);color:inherit;text-align:left;border:0;align-items:center;gap:14px;width:100%;padding:14px 16px;text-decoration:none;transition:box-shadow .15s,transform .15s;display:flex}.list-row .icon{background:var(--lavender);width:48px;height:48px;color:var(--violet);border-radius:14px;flex-shrink:0;justify-content:center;align-items:center;font-size:1.45rem;font-weight:800;display:flex}.list-row .icon.done{background:var(--cyan);color:var(--midnight)}.list-row .icon.navy{background:var(--midnight);color:var(--cyan)}.list-row .grow{flex:1;min-width:0}.list-row .title{font-weight:800;line-height:1.3}.list-row .chev{color:var(--lilac);font-size:1.4rem;font-weight:700}.step{background:var(--paper);border-radius:var(--radius);box-shadow:var(--shadow);color:inherit;align-items:flex-start;gap:14px;padding:16px;text-decoration:none;display:flex}.step .num{background:var(--glow);color:#fff;border-radius:12px;flex-shrink:0;justify-content:center;align-items:center;width:40px;height:40px;font-size:1.1rem;font-weight:800;display:flex}.step.done .num{background:var(--cyan);color:var(--midnight)}.step.done{opacity:.7}.step 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var(--midnight);color:#fff;text-align:center;flex-direction:column;justify-content:center;align-items:center;padding:12px;display:flex;position:absolute;inset:0}.placeholder .ph-id{letter-spacing:.1em;opacity:.6;font-size:.7rem}.placeholder .ph-label{margin-top:4px;font-size:1rem;font-weight:800}.tabs{z-index:10;-webkit-backdrop-filter:blur(12px);border-top:1px solid var(--line);padding-bottom:env(safe-area-inset-bottom);background:#ffffffeb;position:fixed;bottom:0;left:0;right:0}.tabs nav{grid-template-columns:repeat(5,1fr);max-width:600px;margin:0 auto;padding:6px 4px;display:grid}.tabs a{color:var(--slate);border-radius:12px;flex-direction:column;align-items:center;gap:2px;padding:6px 0;font-size:.75rem;font-weight:700;text-decoration:none;display:flex}.tabs a.active{color:var(--violet);background:var(--lavender)}.tabs a.active svg{color:var(--violet)}.bar{background:var(--lavender);border-radius:999px;height:10px;overflow:hidden}.bar>div{background:var(--glow);border-radius:999px;height:100%;transition:width .3s}.pill{background:var(--lavender);color:var(--violet-dark);border-radius:999px;padding:3px 12px;font-size:.8rem;font-weight:700;display:inline-block}.pill.done{background:var(--cyan-soft);color:var(--cyan-dark)}.pill.amber{background:var(--violet);color:#fff}.lesson-body{font-size:1.05rem}.lesson-body h3{margin-top:1.5em;font-size:1.12rem}.lesson-body table{border-collapse:collapse;width:100%;margin:0 0 1em;font-size:.92rem;display:block;overflow-x:auto}.lesson-body th,.lesson-body td{border-bottom:1px solid var(--line);text-align:left;vertical-align:top;padding:8px}.lesson-body th{font-weight:800}.lesson-body blockquote{background:var(--paper);border-left:5px solid var(--lilac);box-shadow:var(--shadow);border-radius:0 14px 14px 0;margin:0 0 1em;padding:14px 16px}.lesson-body blockquote p:last-child{margin:0}.lesson-body ul,.lesson-body ol{padding-left:1.25em}.lesson-body li::marker{color:var(--violet);font-weight:800}.lesson-body figure{margin:0 0 1em}.hook{border-left:5px solid var(--cyan);color:var(--midnight);padding:4px 0 4px 16px;font-size:1.2rem;font-weight:800;line-height:1.4}.sticky-cta{padding:12px 0 0}.option{text-align:left;border:2px solid var(--line);width:100%;min-height:56px;color:var(--text);background:#fff;border-radius:14px;margin-bottom:10px;padding:16px;font-weight:600;transition:border-color .15s;display:block}.option.correct{border-color:var(--cyan-dark);background:var(--cyan-soft)}.option.wrong{border-color:var(--rose);background:var(--rose-soft)}.option.correct:after,.option.wrong:after{float:right;margin-left:8px;font-weight:800}.option.correct:after{content:"✓";color:var(--cyan-dark)}.option.wrong:after{content:"✗";color:var(--rose)}.verdict{margin-bottom:4px;font-size:1.05rem;display:block}.option:disabled{cursor:default}.spot{position:relative}.spot-grid{grid-template-rows:repeat(3,1fr);grid-template-columns:repeat(3,1fr);display:grid;position:absolute;inset:0}.spot-grid button{background:0 0;border:1px dashed #ffffff26}.spot-grid button.hit{box-shadow:inset 0 0 0 4px var(--cyan), 0 0 28px #22d3eecc;border-radius:50%}.spot-grid button.miss{background:#f43f5e4d}.bubble{box-shadow:var(--shadow);background:#fff;border-radius:18px 18px 18px 4px;max-width:90%;padding:12px 16px;display:inline-block}.bubble.me{background:var(--violet);color:#fff;border-radius:18px 18px 4px}.word{color:inherit;background:0 0;border:0;border-radius:6px;padding:2px;font-weight:600}.word:hover{background:var(--lavender)}.word.hit{background:var(--cyan);color:var(--midnight)}.word.miss{background:var(--rose-soft);text-decoration:line-through}.avatar{background:var(--glow);background-repeat:no-repeat;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:64px;height:64px;font-size:1.8rem;display:flex;overflow:hidden}.badge{text-align:center;font-weight:700}.badge .img{aspect-ratio:1;border-radius:50%}.badge.locked .img{filter:grayscale();opacity:.35}.auth-hero{background:radial-gradient(circle at 90% 10%, #22d3ee4d, transparent 45%), radial-gradient(circle at 0% 100%, #7c3aed8c, transparent 55%), var(--midnight);color:#fff;padding:32px 20px 28px}.auth-hero h1{font-size:2rem}.auth-hero p{color:#cbd5e1;margin:0}.checkbox-row{border:2px solid var(--line);background:#fff;border-radius:14px;align-items:center;gap:12px;min-height:56px;margin-bottom:8px;padding:14px;font-weight:600;display:flex}.checkbox-row input{width:22px;height:22px;accent-color:var(--violet)}.checkbox-row.correct{border-color:var(--cyan);background:var(--cyan-soft)}.checkbox-row.wrong{border-color:var(--rose);background:var(--rose-soft)}.segmented{box-shadow:var(--shadow);background:#fff;border-radius:14px;grid-template-columns:1fr 1fr;gap:6px;padding:6px;display:grid}.segmented button{min-height:44px;color:var(--muted);background:0 0;border:0;border-radius:10px;font-weight:800}.segmented button.on{background:var(--midnight);color:#fff}@media print{.tabs,.topbar,.no-print{display:none!important}body{background:#fff}}.listen{flex-wrap:wrap;align-items:center;gap:8px;margin:0 0 16px;display:flex}.listen-main{background:var(--midnight);color:#fff;text-align:left;border:0;border-radius:14px;flex:1;align-items:center;gap:10px;min-height:52px;padding:8px 16px 8px 8px;font-weight:800;display:flex}.listen-icon{background:var(--glow);color:#fff;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:36px;height:36px;font-size:.85rem;display:inline-flex}.listen-chip{border:2px solid var(--line);min-width:52px;min-height:52px;color:var(--midnight);background:#fff;border-radius:14px;font-weight:800}.listen-bar{background:var(--lavender);border-radius:999px;flex-basis:100%;height:6px;overflow:hidden}.listen-bar>div{background:var(--glow);height:100%;transition:width .3s}.lang-switch{background:#ffffff1a;border-radius:999px;margin-left:auto;padding:3px;display:flex}.lang-switch button{color:#cbd5e1;background:0 0;border:0;border-radius:999px;min-height:32px;padding:6px 10px;font-size:.78rem;font-weight:800}.lang-switch button.on{background:var(--violet);color:#fff}.cards,.steps{grid-template-columns:minmax(0,1fr);gap:12px;display:grid}.stack>.cards,.stack>.steps{margin-top:12px}@media (width>=960px){h1{font-size:2.1rem}.app{max-width:none;padding-bottom:0}.topbar{height:64px;padding:12px 28px}.topbar .brand{font-size:1.2rem}.tabs{border-top:0;border-right:1px solid var(--line);background:#fff;width:240px;padding:0;top:64px;bottom:0;right:auto}.tabs nav{flex-direction:column;gap:4px;max-width:none;padding:20px 14px;display:flex}.tabs a{border-radius:12px;flex-direction:row;justify-content:flex-start;gap:14px;padding:12px 16px;font-size:1rem}.tabs a:hover{background:var(--bg);color:var(--midnight)}.main{min-height:calc(100vh - 64px);margin-left:240px}.main .page{max-width:1080px;margin:0 auto;padding:36px 40px 64px}.main .page.reading,.main .reading{max-width:780px}.cards{grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.cards.three{grid-template-columns:repeat(3,minmax(0,1fr))}.steps{grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.steps .step{flex-direction:column;height:100%}.list-row:hover,.step:hover,.tile:hover,.card-link:hover{box-shadow:var(--shadow-hover);transform:translateY(-1px)}.hero-wrap{box-sizing:content-box;max-width:780px;margin:32px auto 0;padding:0 40px}.img.flat.hero{border-radius:var(--radius);max-height:380px}.main>div>.img.flat{max-height:260px}.app>:not(.topbar):not(.main):not(.tabs):not(.auth){max-width:680px;margin:0 auto}.app>:not(.topbar):not(.main):not(.tabs):not(.auth) .img.flat{border-radius:0 0 var(--radius) var(--radius)}.auth{grid-template-columns:1fr 1fr;min-height:100vh;display:grid}.auth-hero{flex-direction:column;justify-content:center;padding:64px 8%;display:flex}.auth-hero h1{font-size:2.8rem}.auth-hero p{max-width:460px;font-size:1.15rem}.auth-form{align-self:center;width:100%;max-width:460px;margin:0 auto;padding:48px 32px}.option:hover:not(:disabled),.listen-chip:hover{border-color:var(--lilac)}}.signal-card .signal-img{border-radius:var(--radius) var(--radius) 0 0;width:calc(100% + 32px);margin:-16px -16px 12px}.summary-card{margin-top:4px}.summary-list{margin:10px 0 0;padding-left:1.3em;font-size:1.05rem;font-weight:700}.summary-list li+li{margin-top:6px}.summary-list li::marker{color:var(--cyan);font-weight:800}.summary-img{max-width:360px;margin:10px 0}.small-seg{box-shadow:none;background:var(--bg);grid-template-columns:repeat(3,1fr)}.small-seg button{min-height:40px;font-size:.9rem}.say-line{justify-content:space-between;align-items:flex-start;gap:10px;font-weight:600;display:flex}.say-copy{background:var(--lavender);color:var(--violet-dark);border:0;border-radius:999px;flex-shrink:0;min-height:32px;padding:6px 12px;font-size:.8rem;font-weight:800}.quiz-card .option{margin-bottom:8px}.say-note{color:var(--muted);font-weight:500}@media (width<=640px){.lesson-body table,.lesson-body tbody,.lesson-body tr,.lesson-body td{width:100%;display:block}.lesson-body thead{display:none}.lesson-body tr{box-shadow:var(--shadow);background:#fff;border-radius:14px;margin-bottom:10px;padding:10px 14px}.lesson-body td{border:0;padding:4px 0}.lesson-body td:first-child{padding-bottom:6px;font-size:1.05rem;font-weight:800}.lesson-body td:not(:first-child):before{content:attr(data-label);letter-spacing:.05em;text-transform:uppercase;color:var(--violet);font-size:.72rem;font-weight:800;display:block}}.img.flat.missing{height:64px;max-height:none;aspect-ratio:auto!important}.img.flat.missing .ph-id{display:none}.img.flat.missing .ph-label{opacity:.9;margin:0;font-size:.85rem}@media (width>=960px){.img.flat.hero.missing{height:72px}}.science h1{font-size:1.65rem}.science h3{border-top:1px solid var(--line);margin-top:1.6em;padding-top:1em}.science h3+p strong:first-child{color:var(--violet)}.science p em{color:var(--muted)}.page-head h1{margin-bottom:4px}.page-head p{color:var(--muted);margin:0}.lesson-map{gap:8px;margin:0 0 14px;display:flex}.lesson-map a{text-align:center;box-shadow:var(--shadow);color:var(--violet-dark);background:#fff;border-radius:999px;flex:1;padding:8px 6px;font-size:.85rem;font-weight:800;text-decoration:none}[id=read],[id=use],[id=quiz]{scroll-margin-top:80px}.img-caption{z-index:1;color:#fff;flex-direction:column;justify-content:flex-end;gap:4px;padding:16px 20px;display:flex;position:absolute}.img-caption h1,.img-caption h2,.img-caption h3{color:#fff;text-wrap:balance;margin:0;line-height:1.15}.img-caption h1{font-size:clamp(1.35rem,5.2vw,2.1rem)}.img-caption h2,.img-caption h3{font-size:clamp(1.1rem,4.4vw,1.6rem)}.img-caption .eyebrow{color:var(--cyan);margin:0}.img-caption p{margin:0}.img-caption.bottom{background:linear-gradient(#0000,#0f172a99 45%,#0f172aeb);padding-top:56px;bottom:0;left:0;right:0}.img-caption.right,.img-caption.left{justify-content:center;width:46%;top:0;bottom:0}.img-caption.right{background:linear-gradient(270deg,#0f172ae6 55%,#0000);padding-left:32px;right:0}.img-caption.left{background:linear-gradient(90deg,#0f172ae6 55%,#0000);padding-right:32px;left:0}.img-caption.center{text-align:center;color:var(--midnight);justify-content:center;align-items:center;inset:0}.img-caption.center h1{color:var(--midnight);font-size:clamp(2.6rem,13vw,4.5rem)}.img-caption.center .eyebrow{color:var(--violet)}@media (width<=420px){.img-caption{padding:12px 14px}.img-caption.right{padding-left:22px}.img-caption.left{padding-right:22px}}