:root {
  color-scheme: dark;
  --navy-950:#020a10; --navy-900:#041722; --navy-850:#082c34; --navy-800:#0c3a43;
  --cyan:#71e6ff; --cyan-strong:#19cde8; --gold:#f6d47b; --gold-strong:#ffc85e;
  --green:#9edb70; --ink:#f8fbff; --muted:#c2d1d8;
  --surface:rgba(3,18,27,.91); --surface-strong:rgba(2,12,19,.97);
  --border:rgba(246,212,123,.42); --shadow:0 28px 80px rgba(0,0,0,.44);
  --radius-xl:28px; --radius-lg:20px; --radius-md:14px;
  --ease:cubic-bezier(.2,.75,.2,1);
  font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
}
*{box-sizing:border-box} html{min-width:320px;background:var(--navy-950);scroll-behavior:smooth;overflow-x:hidden}
body{margin:0;overflow-x:hidden;color:var(--ink);background:var(--navy-950)} button{font:inherit}
button:focus-visible,[tabindex]:focus-visible{outline:3px solid var(--cyan);outline-offset:3px}[hidden]{display:none!important}
.skip-link{position:fixed;z-index:999;left:1rem;top:-100px;padding:.7rem 1rem;border-radius:999px;color:#04111c;background:#fff;transition:top .2s var(--ease)}
.skip-link:focus{top:1rem}
.app-shell{min-height:100svh;display:grid;grid-template-rows:auto 1fr auto;overflow-x:hidden;background:var(--navy-950)}
.topbar{position:relative;z-index:30;display:grid;grid-template-columns:minmax(210px,.9fr) minmax(320px,1.7fr) minmax(160px,.8fr);align-items:center;gap:1rem;min-height:96px;padding:.65rem clamp(1rem,2.5vw,2.6rem);border-bottom:1px solid rgba(255,255,255,.08);background:rgba(1,10,16,.9);backdrop-filter:blur(18px)}
.brand-lockup{min-width:0;display:flex;align-items:center;gap:.7rem}.brand-logo{width:70px;height:70px;object-fit:cover;object-position:50% 33%;border-radius:14px;border:1px solid rgba(255,255,255,.14)}
.brand-copy{min-width:0;display:grid;gap:.1rem}.brand-copy strong{letter-spacing:.15em;color:#fff}.brand-copy span{color:var(--gold);font-size:.62rem;letter-spacing:.12em;white-space:nowrap}
.lesson-identity{min-width:0;text-align:center}.eyebrow{color:var(--gold);font-size:.65rem;letter-spacing:.14em}.lesson-identity h1{margin:.22rem 0 0;font-size:clamp(1rem,1.55vw,1.45rem);line-height:1.15;letter-spacing:.04em}
.top-actions{justify-self:end;display:flex;gap:.45rem}.icon-button{width:42px;height:42px;border-radius:50%;color:var(--ink);cursor:pointer;border:1px solid rgba(255,255,255,.14);background:rgba(255,255,255,.055)}.icon-button:hover{border-color:rgba(113,230,255,.5);background:rgba(113,230,255,.1)}

/* Living world */
.lesson-stage{position:relative;min-height:720px;overflow:hidden;isolation:isolate}.world{position:absolute;inset:0;z-index:-3;overflow:hidden;background:#082b34;transition:filter .7s var(--ease)}
.world::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(0,0,0,.35),transparent 25%,transparent 75%,rgba(0,0,0,.34)),linear-gradient(0deg,rgba(0,9,13,.35),transparent 42%);pointer-events:none}
.world-sky{position:absolute;inset:0 0 32%;background:linear-gradient(180deg,#061c2e 0%,#124852 58%,#6a8b66 100%);transition:background 1s var(--ease)}
.sun-or-moon{position:absolute;top:10%;left:53%;width:clamp(74px,7.5vw,118px);aspect-ratio:1;border-radius:50%;transform:translateX(-50%);background:radial-gradient(circle at 40% 35%,#fff9ce,#f7d578 58%,#d99a38);box-shadow:0 0 55px rgba(255,218,119,.45),0 0 160px rgba(255,218,119,.16);transition:top 1s var(--ease),left 1s var(--ease),background 1s var(--ease),box-shadow 1s var(--ease),transform 1s var(--ease)}
.cloud{position:absolute;width:240px;height:54px;border-radius:50%;opacity:.24;filter:blur(1px);background:radial-gradient(ellipse at 25% 70%,#dceef2 0 38%,transparent 40%),radial-gradient(ellipse at 55% 55%,#dceef2 0 45%,transparent 47%),radial-gradient(ellipse at 82% 72%,#dceef2 0 32%,transparent 34%);animation:cloud-drift 28s linear infinite}.cloud-a{top:12%;left:-8%}.cloud-b{top:20%;right:-9%;animation-duration:35s;animation-direction:reverse;transform:scale(.72)}
.far-hills{position:absolute;left:-5%;right:-5%;bottom:35%;height:35%;clip-path:polygon(0 58%,10% 38%,22% 54%,33% 31%,45% 57%,58% 29%,70% 52%,83% 35%,100% 61%,100% 100%,0 100%);background:linear-gradient(180deg,rgba(21,93,87,.75),#0c4a4c);opacity:.76;transition:background 1s var(--ease)}
.village-roofs{position:absolute;left:8%;bottom:35%;width:26%;height:18%;opacity:.58}.village-roofs i{position:absolute;bottom:0;width:72px;height:45px;background:#183632;border-radius:2px}.village-roofs i::before{content:"";position:absolute;left:-11px;top:-24px;border-left:47px solid transparent;border-right:47px solid transparent;border-bottom:30px solid #132b2b}.village-roofs i:nth-child(1){left:0;transform:scale(.8)}.village-roofs i:nth-child(2){left:58px;bottom:5px;transform:scale(.62)}.village-roofs i:nth-child(3){left:110px;transform:scale(.74)}.village-roofs i:nth-child(4){left:165px;bottom:3px;transform:scale(.55)}
.bamboo{position:absolute;bottom:22%;width:190px;height:62%;opacity:.75;filter:drop-shadow(0 20px 20px rgba(0,0,0,.24));transform-origin:bottom}.bamboo-left{left:-35px}.bamboo-right{right:-42px;transform:scaleX(-1)}
.bamboo i{position:absolute;bottom:0;width:10px;height:100%;border-radius:999px;background:linear-gradient(90deg,#315d31,#6ca249 47%,#264b29);box-shadow:inset 0 0 0 1px rgba(255,255,255,.08);transform-origin:bottom}.bamboo i::after{content:"";position:absolute;left:-2px;right:-2px;height:4px;border-radius:999px;background:#a3be66;box-shadow:0 110px #94b25c,0 220px #86a651,0 330px #739544}
.bamboo i:nth-child(1){left:20px;height:92%;transform:rotate(-7deg)}.bamboo i:nth-child(2){left:54px;height:78%;transform:rotate(4deg)}.bamboo i:nth-child(3){left:92px;height:100%;transform:rotate(-2deg)}.bamboo i:nth-child(4){left:128px;height:72%;transform:rotate(8deg)}.bamboo i:nth-child(5){left:158px;height:88%;transform:rotate(3deg)}
.bamboo b{position:absolute;width:74px;height:24px;border-radius:100% 0 100% 0;background:linear-gradient(145deg,#508a42,#214d33);transform-origin:0 50%;animation:leaf-sway 4.8s ease-in-out infinite}.bamboo b:nth-of-type(1){left:62px;top:18%;transform:rotate(-28deg)}.bamboo b:nth-of-type(2){left:96px;top:35%;transform:rotate(24deg)}.bamboo b:nth-of-type(3){left:32px;top:47%;transform:rotate(-18deg)}
.garden-bank{position:absolute;left:-4%;width:108%;transition:background 1s var(--ease)}.bank-back{bottom:19%;height:28%;clip-path:ellipse(62% 60% at 50% 100%);background:linear-gradient(#2d6a43,#113f34)}.bank-front{bottom:-12%;height:39%;clip-path:ellipse(64% 54% at 50% 0);background:linear-gradient(#174d36 0%,#092d28 54%,#061d1d 100%);box-shadow:inset 0 24px 40px rgba(128,206,104,.08)}
.stream{position:absolute;left:-4%;right:-4%;bottom:3%;height:27%;clip-path:polygon(0 26%,18% 0,35% 20%,53% 5%,70% 24%,87% 4%,100% 20%,100% 100%,0 100%);background:linear-gradient(180deg,rgba(55,173,184,.72),rgba(8,72,88,.94) 55%,#031b28);box-shadow:inset 0 12px 30px rgba(151,244,255,.1);overflow:hidden;transition:background 1s var(--ease)}
.stream-glow{position:absolute;inset:-20% 20% 8%;background:radial-gradient(ellipse,rgba(107,228,255,.42),transparent 66%);animation:stream-shimmer 5.5s ease-in-out infinite}.ripple{position:absolute;left:53%;top:33%;width:260px;height:58px;border:2px solid rgba(145,238,255,.32);border-radius:50%;transform:translate(-50%,-50%);animation:ripple-spread 4s ease-out infinite}.ripple-b{animation-delay:-2s}
.stone-bridge{position:absolute;left:42%;bottom:19%;width:22%;height:11%;border-radius:60% 60% 8px 8px;background:linear-gradient(#ad9b74,#655d4f);box-shadow:0 18px 28px rgba(0,0,0,.28);transform:perspective(650px) rotateX(58deg);transform-origin:bottom;opacity:.88}.stone-bridge::after{content:"";position:absolute;left:17%;right:17%;bottom:-34%;height:70%;border-radius:50% 50% 0 0;background:#0a4c55;box-shadow:inset 0 8px 15px rgba(0,0,0,.3)}.stone-bridge span{position:absolute;top:12%;bottom:12%;width:2px;background:rgba(255,255,255,.16)}.stone-bridge span:nth-child(1){left:28%}.stone-bridge span:nth-child(2){left:52%}.stone-bridge span:nth-child(3){left:75%}
.flower-bed{position:absolute;bottom:18%;width:260px;height:100px;opacity:.72}.flowers-left{left:7%}.flowers-right{right:8%;transform:scaleX(-1)}.flower-bed i{position:absolute;bottom:0;width:7px;height:52px;border-radius:999px;background:#367747;transform-origin:bottom;animation:flower-sway 5s ease-in-out infinite}.flower-bed i::before{content:"";position:absolute;left:50%;top:-9px;width:22px;height:22px;border-radius:50%;transform:translateX(-50%);background:radial-gradient(circle,#ffe39a 0 22%,#e993a6 24% 58%,#b94f76 60%);box-shadow:0 0 16px rgba(255,211,141,.25)}.flower-bed i:nth-child(1){left:18px;height:44px}.flower-bed i:nth-child(2){left:65px;height:60px;animation-delay:-1s}.flower-bed i:nth-child(3){left:115px;height:48px;animation-delay:-2s}.flower-bed i:nth-child(4){left:166px;height:69px;animation-delay:-3s}.flower-bed i:nth-child(5){left:215px;height:52px;animation-delay:-4s}
.lantern{position:absolute;bottom:39%;width:18px;height:24px;border-radius:4px;background:#ffd779;box-shadow:0 0 22px rgba(255,203,87,.85),0 0 70px rgba(255,194,69,.3);opacity:0;transition:opacity 1s var(--ease)}.lantern::before{content:"";position:absolute;left:8px;bottom:100%;width:2px;height:82px;background:#68472a}.lantern-left{left:28%}.lantern-right{right:25%}
.light-rays{position:absolute;inset:-10% 10% 30%;background:conic-gradient(from 185deg at 53% 20%,transparent 0 42%,rgba(255,225,151,.09) 44%,transparent 47% 53%,rgba(255,225,151,.07) 55%,transparent 58%);mix-blend-mode:screen;opacity:.7;transition:opacity 1s var(--ease)}
.world-particles{position:absolute;inset:18% 8% 15%;opacity:.5;background-image:radial-gradient(circle,#ffe09b 0 2px,transparent 3px),radial-gradient(circle,#8befff 0 1.5px,transparent 2.5px);background-size:109px 88px,143px 127px;animation:particle-rise 5s ease-in-out infinite alternate}.wind-lines i{position:absolute;width:150px;height:1px;border-radius:999px;background:linear-gradient(90deg,transparent,rgba(211,250,224,.26),transparent);animation:wind-pass 8s linear infinite}.wind-lines i:nth-child(1){left:16%;top:33%}.wind-lines i:nth-child(2){left:70%;top:43%;animation-delay:-3s}.wind-lines i:nth-child(3){left:42%;top:18%;animation-delay:-6s}

/* Scene-specific world continuity */
.app-shell[data-scene-id="1"] .world-sky{background:linear-gradient(180deg,#071d31 0%,#144b54 57%,#6a8d65 100%)}
.app-shell[data-scene-id="1"] .sun-or-moon{top:11%;left:54%;transform:translateX(-50%) scale(.86)}
.app-shell[data-scene-id="2"] .world-sky{background:linear-gradient(180deg,#0a2940 0%,#297271 56%,#99b768 100%)}
.app-shell[data-scene-id="2"] .sun-or-moon{top:7%;left:62%;transform:translateX(-50%) scale(1.02);box-shadow:0 0 70px rgba(255,225,136,.55),0 0 190px rgba(255,221,120,.22)}
.app-shell[data-scene-id="2"] .flower-bed{opacity:1}.app-shell[data-scene-id="2"] .stream{background:linear-gradient(180deg,rgba(83,196,191,.78),rgba(10,93,103,.94) 55%,#042431)}
.app-shell[data-scene-id="3"] .world-sky{background:linear-gradient(180deg,#0b2a42 0%,#4c8077 53%,#d4ad66 100%)}
.app-shell[data-scene-id="3"] .sun-or-moon{top:15%;left:72%;transform:translateX(-50%) scale(1.08);background:radial-gradient(circle at 40% 35%,#fffbe2,#ffd976 55%,#e9a342);box-shadow:0 0 90px rgba(255,217,112,.62),0 0 250px rgba(255,192,80,.25)}
.app-shell[data-scene-id="3"] .light-rays{opacity:1}.app-shell[data-scene-id="3"] .far-hills{background:linear-gradient(180deg,rgba(45,107,93,.72),#1b5650)}
.app-shell[data-scene-id="4"] .world-sky{background:linear-gradient(180deg,#071324 0%,#173d4e 53%,#6e654f 100%)}
.app-shell[data-scene-id="4"] .sun-or-moon{top:8%;left:46%;transform:translateX(-50%) scale(.72);background:radial-gradient(circle at 38% 35%,#fff,#dfeeff 62%,#a7c9e5);box-shadow:0 0 70px rgba(191,226,255,.5),0 0 210px rgba(108,194,255,.2)}
.app-shell[data-scene-id="4"] .lantern{opacity:1}.app-shell[data-scene-id="4"] .world-particles{opacity:.78}.app-shell[data-scene-id="4"] .stream{background:linear-gradient(180deg,rgba(42,129,150,.76),rgba(5,59,78,.96) 58%,#021420)}

.scene-grid{min-height:720px;display:grid;grid-template-columns:minmax(210px,.78fr) minmax(500px,1.55fr) minmax(330px,1fr);gap:clamp(1rem,2vw,2.2rem);align-items:center;max-width:1640px;margin:0 auto;padding:clamp(1.2rem,2.8vw,3rem)}
.scene-copy{align-self:start;margin-top:clamp(2rem,7vh,6rem);max-width:390px;text-shadow:0 2px 18px rgba(0,0,0,.45)}.scene-kicker{display:flex;align-items:center;gap:.55rem;margin:0 0 .8rem;color:var(--gold);font-size:.69rem;letter-spacing:.14em}.pulse-dot{width:8px;height:8px;border-radius:50%;background:var(--gold);box-shadow:0 0 0 0 rgba(246,212,123,.5);animation:pulse 2.2s infinite}.scene-copy h2{margin:0;max-width:14ch;font-family:Georgia,"Times New Roman",serif;font-size:clamp(2rem,3.1vw,4.25rem);line-height:.98;font-weight:500}.scene-copy>p:nth-of-type(2){margin:1rem 0 0;color:#dbe8ed;font-size:clamp(.95rem,1.15vw,1.15rem);line-height:1.6}.place-label{display:inline-flex!important;align-items:center;gap:.42rem;margin:1.1rem 0 0!important;padding:.42rem .7rem;border:1px solid rgba(255,255,255,.12);border-radius:999px;background:rgba(1,18,25,.42);color:#d8e9de!important;font-size:.7rem!important;letter-spacing:.06em;backdrop-filter:blur(8px)}

/* Characters live inside the world */
.character-field{position:relative;height:min(69vh,660px);min-height:510px;align-self:end;perspective:900px}.scene-props{position:absolute;inset:0;z-index:9;pointer-events:none}.character{position:absolute;margin:0;transition:transform .75s var(--ease),filter .75s var(--ease),opacity .5s var(--ease);transform-origin:50% 90%}.character img{position:relative;z-index:2;display:block;width:100%;height:auto;object-fit:contain;filter:drop-shadow(0 26px 27px rgba(0,0,0,.34))}.contact-shadow{position:absolute;z-index:1;left:15%;right:15%;bottom:0;height:8%;border-radius:50%;background:radial-gradient(ellipse,rgba(0,0,0,.55),transparent 70%);filter:blur(7px);transform:scaleX(.94)}
.character-tag{position:absolute;z-index:12;left:50%;bottom:-4px;transform:translateX(-50%);display:grid;min-width:110px;gap:.08rem;padding:.32rem .55rem;text-align:center;border-radius:999px;background:rgba(1,13,22,.75);border:1px solid rgba(255,255,255,.12);backdrop-filter:blur(8px);white-space:nowrap;opacity:.86;transition:opacity .35s var(--ease)}.character-tag span{font-size:.58rem;letter-spacing:.1em;color:var(--gold)}.character-tag small{color:#d8e7ee;font-size:.61rem}
.professor-owl{width:clamp(112px,11.2vw,178px);left:0;bottom:5%;z-index:3;animation:owl-breathe 5.4s ease-in-out infinite}.sigma{width:clamp(92px,8.7vw,138px);left:20%;top:25%;z-index:5;animation:sigma-float 4.2s ease-in-out infinite}.interaction-cluster{position:absolute;inset:0 0 0 31%}.cricket{width:clamp(126px,13vw,208px);left:2%;bottom:7%;z-index:7;animation:cricket-alive 3.8s ease-in-out infinite}.little-ant{width:clamp(113px,11.5vw,184px);right:0;bottom:4%;z-index:7;animation:ant-think 4.2s ease-in-out infinite}
.knowledge-anchor{position:absolute;left:54%;top:49%;z-index:10;width:98px;height:98px;transform:translate(-50%,-50%);transition:transform .65s var(--ease),filter .65s var(--ease),top .65s var(--ease),left .65s var(--ease)}.shared-seed{position:absolute;z-index:4;inset:24%;display:grid;place-items:center;border-radius:50%;color:#44280b;font-size:1.65rem;background:radial-gradient(circle,#fff9cf 0 14%,#ffc95e 39%,#cc7d20 100%);box-shadow:0 0 20px #ffd36f,0 0 54px rgba(255,203,89,.72);animation:seed-breathe 1.8s ease-in-out infinite}.anchor-ring{position:absolute;inset:5%;border:1px solid rgba(255,221,130,.58);border-radius:50%;animation:ring-expand 3s ease-out infinite}.ring-two{animation-delay:-1.5s}.connection-line{position:absolute;z-index:1;left:50%;top:50%;width:220px;height:2px;transform:translate(-50%,-50%) rotate(-5deg);background:linear-gradient(90deg,transparent,rgba(255,211,109,.95),transparent);box-shadow:0 0 18px rgba(255,211,109,.6);transition:width .6s var(--ease),height .6s var(--ease),transform .6s var(--ease)}.evidence-dot{position:absolute;top:49%;width:10px;height:10px;border-radius:50%;background:#ffe293;box-shadow:0 0 20px #ffe293}.evidence-left{left:-55px}.evidence-right{right:-55px}
.seed-token{position:absolute;z-index:11;display:grid;place-items:center;width:38px;height:38px;border-radius:50%;color:#5f3b0d;background:radial-gradient(circle,#fff7cb,#ffc75c 56%,#b66b16);box-shadow:0 0 18px rgba(255,211,105,.9);opacity:0;transition:opacity .45s var(--ease),transform .8s var(--ease)}.seed-one{left:57%;top:51%}.seed-two{left:66%;top:54%}.kindness-arc{position:absolute;left:48%;top:36%;width:210px;height:120px;border-top:3px solid rgba(255,221,130,.65);border-radius:50%;filter:drop-shadow(0 0 11px rgba(255,212,105,.7));opacity:0;transform:rotate(5deg);transition:opacity .7s var(--ease),transform .7s var(--ease)}.evidence-aura{position:absolute;left:50%;top:42%;width:260px;height:180px;border-radius:50%;background:radial-gradient(ellipse,rgba(255,211,105,.23),transparent 68%);opacity:0;filter:blur(2px);transition:opacity .7s var(--ease)}.path-spark{position:absolute;left:50%;bottom:13%;width:260px;height:32px;border-radius:50%;background:radial-gradient(ellipse,rgba(130,238,255,.48),transparent 68%);opacity:0;transition:opacity .7s var(--ease)}

/* Character acting and continuity */
.app-shell[data-scene-id="1"] .cricket{transform:translate(-16px,0) rotate(-2deg) scale(.98)}.app-shell[data-scene-id="1"] .little-ant{transform:translate(8px,4px) rotate(1.5deg) scale(.96)}.app-shell[data-scene-id="1"] .seed-one{opacity:1;transform:translate(-68px,-18px)}
.app-shell[data-scene-id="2"] .cricket{transform:translate(24px,-14px) rotate(2.5deg) scale(1.02)}.app-shell[data-scene-id="2"] .little-ant{transform:translate(-18px,-8px) rotate(-2deg) scale(1.01)}.app-shell[data-scene-id="2"] .professor-owl{transform:translate(18px,-9px) rotate(1deg)}.app-shell[data-scene-id="2"] .sigma{transform:translate(13px,-15px) scale(.96)}.app-shell[data-scene-id="2"] .evidence-aura,.app-shell[data-scene-id="2"] .kindness-arc{opacity:1}.app-shell[data-scene-id="2"] .kindness-arc{transform:rotate(-2deg) scale(1.03)}
.app-shell[data-scene-id="3"] .sigma{transform:translate(46px,-22px) scale(1.1)}.app-shell[data-scene-id="3"] .professor-owl{transform:translate(14px,-5px) scale(.97)}.app-shell[data-scene-id="3"] .cricket{transform:translate(31px,-9px) rotate(2deg)}.app-shell[data-scene-id="3"] .little-ant{transform:translate(-27px,-9px) rotate(-2deg)}.app-shell[data-scene-id="3"] .knowledge-anchor{top:41%;left:55%}.app-shell[data-scene-id="3"] .connection-line{width:295px;transform:translate(-50%,-50%) rotate(0)}.app-shell[data-scene-id="3"] .kindness-arc,.app-shell[data-scene-id="3"] .evidence-aura{opacity:1}.app-shell[data-scene-id="3"] .path-spark{opacity:1}
.app-shell[data-scene-id="4"] .little-ant{transform:translate(-50px,-22px) rotate(-2.5deg) scale(1.04)}.app-shell[data-scene-id="4"] .cricket{transform:translate(17px,7px) rotate(1deg) scale(.98)}.app-shell[data-scene-id="4"] .sigma{transform:translate(30px,-12px) scale(1.03)}.app-shell[data-scene-id="4"] .professor-owl{transform:translate(28px,-3px)}.app-shell[data-scene-id="4"] .seed-one{opacity:1;transform:translate(4px,-9px)}.app-shell[data-scene-id="4"] .seed-two{opacity:1;transform:translate(-73px,10px)}.app-shell[data-scene-id="4"] .kindness-arc{opacity:1;transform:rotate(4deg) scale(1.12)}.app-shell[data-scene-id="4"] .path-spark{opacity:1}

/* Quiet learning surface */
.learning-surface{align-self:center;padding:clamp(1.1rem,2vw,1.75rem);border:1px solid var(--border);border-radius:var(--radius-xl);background:linear-gradient(145deg,rgba(3,17,27,.95),rgba(5,40,45,.84));box-shadow:var(--shadow),inset 0 1px 0 rgba(255,255,255,.055);backdrop-filter:blur(18px)}.surface-header{display:flex;justify-content:space-between;align-items:flex-start;gap:1rem}.surface-label{margin:0 0 .45rem;color:var(--gold);font-size:.68rem;letter-spacing:.14em}.surface-header h3{margin:0;font-size:clamp(1.2rem,1.6vw,1.7rem);line-height:1.25}.guide-chip{flex:0 0 auto;display:inline-flex;align-items:center;gap:.38rem;padding:.38rem .58rem;border-radius:999px;color:var(--gold);background:rgba(246,212,123,.08);border:1px solid rgba(246,212,123,.2);font-size:.68rem;letter-spacing:.08em}.choice-grid{display:grid;gap:.65rem;margin-top:1.1rem}.choice{display:flex;align-items:center;gap:.8rem;min-height:58px;padding:.72rem .85rem;text-align:left;color:var(--ink);cursor:pointer;border:1px solid rgba(255,255,255,.12);border-radius:var(--radius-md);background:rgba(255,255,255,.04);transition:transform .18s var(--ease),border-color .18s var(--ease),background .18s var(--ease)}.choice:hover:not(:disabled){transform:translateY(-2px);border-color:rgba(113,230,255,.45);background:rgba(113,230,255,.08)}.choice[aria-pressed="true"]{border-color:var(--gold);background:rgba(246,212,123,.09)}.choice:disabled{cursor:default}.choice-icon{flex:0 0 42px;width:42px;height:42px;display:grid;place-items:center;border-radius:13px;background:rgba(255,255,255,.07);font-size:1.25rem}.feedback{display:flex;gap:.8rem;margin-top:1rem;padding:.85rem;border-left:3px solid var(--cyan);border-radius:0 12px 12px 0;background:rgba(113,230,255,.065)}.feedback-character{font-size:1.55rem}.feedback strong{display:block;color:#fff}.feedback p{margin:.28rem 0 0;color:var(--muted);line-height:1.5}.memory-lock,.completion-panel{display:flex;gap:1rem;align-items:center;margin-top:1.15rem;padding:1rem;border:1px solid rgba(246,212,123,.38);border-radius:18px;background:linear-gradient(135deg,rgba(246,212,123,.11),rgba(113,230,255,.06));animation:memory-in .5s var(--ease)}.memory-symbol,.completion-mark{flex:0 0 56px;width:56px;height:56px;display:grid;place-items:center;border-radius:50%;color:#0a2932;background:linear-gradient(135deg,#fff2b5,#80eaff);font-family:Georgia,serif;font-size:2rem}.memory-lock p,.completion-panel p{margin:0 0 .3rem;color:var(--gold);font-size:.67rem;letter-spacing:.14em}.memory-lock strong,.completion-panel strong{display:block;font-family:Georgia,serif;font-size:1.2rem;line-height:1.35}.completion-panel span:last-child{display:block;margin-top:.45rem;color:var(--muted);line-height:1.45}.surface-actions{display:flex;justify-content:flex-end;gap:.7rem;margin-top:1.15rem}.primary-button,.secondary-button{min-height:46px;padding:.7rem 1rem;border-radius:999px;cursor:pointer}.primary-button{color:#07212a;border:0;background:linear-gradient(135deg,var(--gold),#fff1b2);font-weight:750;box-shadow:0 8px 24px rgba(245,198,78,.18)}.primary-button:disabled{cursor:not-allowed;opacity:.48;box-shadow:none}.secondary-button{color:var(--ink);border:1px solid rgba(255,255,255,.16);background:rgba(255,255,255,.04)}
.footer-bar{position:relative;z-index:20;display:grid;grid-template-columns:minmax(180px,.7fr) minmax(430px,1.4fr) minmax(180px,.7fr);gap:1rem;align-items:center;min-height:62px;padding:.6rem clamp(1rem,2.5vw,2.5rem);background:rgba(1,9,16,.98);border-top:1px solid rgba(255,255,255,.08)}.progress-label{display:block;margin-bottom:.4rem;color:var(--muted);font-size:.64rem;letter-spacing:.13em}.progress-track{width:min(240px,100%);height:5px;overflow:hidden;border-radius:999px;background:rgba(255,255,255,.1)}.progress-track span{display:block;width:6%;height:100%;border-radius:inherit;background:linear-gradient(90deg,var(--cyan),var(--gold));transition:width .55s var(--ease)}.motto{display:flex;justify-content:center;align-items:center;gap:.7rem;margin:0;font-family:Georgia,"Times New Roman",serif;font-size:clamp(.78rem,1vw,1rem)}.motto span:nth-of-type(1){color:var(--cyan)}.motto span:nth-of-type(2){color:var(--gold)}.motto span:nth-of-type(3){color:var(--green)}.motto i{width:1px;height:18px;background:rgba(255,255,255,.18)}.footer-mark{margin:0;text-align:right;color:var(--gold);font-size:.65rem;letter-spacing:.12em}

/* Correct, memory and completion change the world */
.app-shell[data-phase="retry"] .learning-surface{border-color:rgba(113,230,255,.55)}.app-shell[data-phase="correct"] .knowledge-anchor,.app-shell[data-phase="memory"] .knowledge-anchor,.app-shell[data-phase="complete"] .knowledge-anchor{transform:translate(-50%,-50%) scale(1.2);filter:saturate(1.25)}.app-shell[data-phase="correct"] .connection-line,.app-shell[data-phase="memory"] .connection-line,.app-shell[data-phase="complete"] .connection-line{width:300px;height:4px}.app-shell[data-phase="correct"] .cricket,.app-shell[data-phase="memory"] .cricket,.app-shell[data-phase="correct"] .little-ant,.app-shell[data-phase="memory"] .little-ant{filter:drop-shadow(0 25px 35px rgba(246,212,123,.25))}.app-shell[data-phase="correct"] .evidence-aura,.app-shell[data-phase="memory"] .evidence-aura,.app-shell[data-phase="complete"] .evidence-aura{opacity:1}.app-shell[data-phase="memory"] .scene-copy{opacity:.72}.app-shell[data-phase="memory"] .character-tag{opacity:.45}.app-shell[data-phase="complete"] .lantern{opacity:1}.app-shell[data-phase="complete"] .world-particles{opacity:1}.app-shell[data-phase="complete"] .sun-or-moon{box-shadow:0 0 95px rgba(202,233,255,.65),0 0 260px rgba(127,207,255,.3)}
.app-shell.is-transitioning .scene-grid{opacity:.15;transform:translateY(10px)}.scene-grid{transition:opacity .32s var(--ease),transform .32s var(--ease)}
.app-shell[data-motion="reduced"] *, .app-shell[data-motion="reduced"] *::before,.app-shell[data-motion="reduced"] *::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important;scroll-behavior:auto!important}.app-shell[data-contrast="high"]{--ink:#fff;--muted:#eef6f8;--surface:rgba(0,0,0,.98);--border:rgba(255,228,134,.95)}.app-shell[data-contrast="high"] .world{filter:contrast(1.23) saturate(.75)}.app-shell[data-contrast="high"] .learning-surface{background:rgba(0,6,11,.98)}.app-shell[data-contrast="high"] .choice{border-color:rgba(255,255,255,.5)}

@keyframes sigma-float{0%,100%{translate:0 0;rotate:-1deg}50%{translate:0 -12px;rotate:1deg}}@keyframes cricket-alive{0%,100%{translate:0 0;rotate:-1deg}50%{translate:0 -6px;rotate:1deg}}@keyframes ant-think{0%,100%{translate:0 0;rotate:.6deg}50%{translate:-3px 0;rotate:-1.2deg}}@keyframes owl-breathe{0%,100%{scale:1}50%{scale:1.012}}@keyframes seed-breathe{0%,100%{transform:scale(1)}50%{transform:scale(1.1)}}@keyframes ring-expand{0%{transform:scale(.48);opacity:.75}100%{transform:scale(1.2);opacity:0}}@keyframes pulse{70%{box-shadow:0 0 0 12px rgba(246,212,123,0)}100%{box-shadow:0 0 0 0 rgba(246,212,123,0)}}@keyframes memory-in{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}@keyframes cloud-drift{to{translate:140vw 0}}@keyframes leaf-sway{0%,100%{rotate:-2deg}50%{rotate:4deg}}@keyframes flower-sway{0%,100%{rotate:-2deg}50%{rotate:3deg}}@keyframes stream-shimmer{0%,100%{opacity:.45;transform:translateX(-2%)}50%{opacity:.85;transform:translateX(2%)}}@keyframes ripple-spread{0%{transform:translate(-50%,-50%) scale(.35);opacity:.65}100%{transform:translate(-50%,-50%) scale(1.5);opacity:0}}@keyframes particle-rise{from{opacity:.25;transform:translateY(5px)}to{opacity:.7;transform:translateY(-12px)}}@keyframes wind-pass{0%{transform:translateX(-80px);opacity:0}20%{opacity:1}80%{opacity:1}100%{transform:translateX(260px);opacity:0}}

@media(max-width:1180px){.topbar{grid-template-columns:auto 1fr auto}.brand-copy span{display:none}.scene-grid{grid-template-columns:minmax(200px,.7fr) minmax(440px,1.45fr) minmax(300px,.9fr);padding-inline:1.4rem}.character-field{min-height:520px}}
@media(max-width:960px){.app-shell{overflow:visible}.topbar{position:sticky;top:0;z-index:50;min-height:70px}.brand-copy{display:none}.lesson-identity{text-align:left}.lesson-stage{min-height:auto;overflow:visible}.world{position:fixed;z-index:-3}.scene-grid{min-height:calc(100svh - 132px);grid-template-columns:1fr;grid-template-rows:auto minmax(400px,55vh) auto;gap:1rem;padding:1.15rem}.scene-copy{margin:.4rem 0 0;max-width:680px}.scene-copy h2{max-width:18ch;font-size:clamp(1.8rem,5vw,3rem)}.character-field{height:53vh;min-height:400px}.learning-surface{width:min(760px,100%);justify-self:center}.footer-bar{grid-template-columns:1fr;gap:.55rem;text-align:center}.progress-track{margin-inline:auto}.footer-mark{display:none}.bamboo{opacity:.48}.village-roofs{opacity:.38}.flower-bed{opacity:.55}.stone-bridge{left:39%;width:28%}}
@media(max-width:640px){.topbar{min-height:70px;padding:.4rem .65rem;gap:.55rem}.brand-logo{width:54px;height:54px;border-radius:12px}.lesson-identity h1{font-size:.92rem}.eyebrow{font-size:.54rem}.top-actions{gap:.3rem}.icon-button{width:38px;height:38px}.scene-grid{grid-template-rows:auto minmax(340px,50vh) auto;padding:.85rem .72rem 1.1rem}.scene-copy{margin-top:.1rem}.scene-copy h2{max-width:15ch;font-size:clamp(1.62rem,8vw,2.3rem)}.scene-copy>p:nth-of-type(2){margin-top:.65rem;font-size:.94rem}.place-label{font-size:.62rem!important}.character-field{height:48vh;min-height:340px}.professor-owl{width:clamp(82px,23vw,122px);left:-2%;bottom:4%}.sigma{width:clamp(72px,19vw,104px);left:18%;top:22%}.interaction-cluster{left:25%}.cricket{width:clamp(98px,29vw,142px);left:0;bottom:8%}.little-ant{width:clamp(92px,25vw,130px);right:-1%;bottom:5%}.knowledge-anchor{width:76px;height:76px;left:54%;top:48%}.connection-line{width:155px}.evidence-left{left:-36px}.evidence-right{right:-36px}.seed-token{width:29px;height:29px;font-size:.78rem}.kindness-arc{left:43%;top:35%;width:150px;height:85px}.evidence-aura{left:42%;top:40%;width:190px;height:135px}.character-tag{min-width:80px;padding:.24rem .4rem}.character-tag span{font-size:.48rem}.character-tag small{font-size:.52rem}.learning-surface{padding:1rem;border-radius:22px}.surface-header{gap:.6rem}.surface-header h3{font-size:1.12rem}.guide-chip{padding:.32rem .48rem;font-size:.62rem}.choice{min-height:54px;padding:.62rem .7rem}.choice-icon{flex-basis:36px;width:36px;height:36px}.feedback{align-items:flex-start}.surface-actions{position:sticky;bottom:0;z-index:4;margin:1rem -.3rem -.25rem;padding:.75rem .3rem .25rem;background:linear-gradient(transparent,rgba(3,17,29,.98) 34%)}.surface-actions button{flex:1 1 auto}.footer-bar{padding:.65rem .75rem calc(.65rem + env(safe-area-inset-bottom))}.motto{flex-wrap:wrap;gap:.35rem .55rem;font-size:.76rem}.motto i{height:14px}.bamboo{width:130px}.bamboo-right{display:none}.village-roofs{left:3%;width:38%;transform:scale(.75);transform-origin:left bottom}.stone-bridge{left:34%;width:38%;bottom:18%}.flower-bed{transform:scale(.7);transform-origin:bottom}.flowers-left{left:-5%}.flowers-right{right:-8%}.sun-or-moon{left:68%}.app-shell[data-scene-id="4"] .sun-or-moon{left:52%}}
@media(max-width:420px){.brand-logo{width:50px;height:50px}.lesson-identity h1{font-size:.82rem}.top-actions .icon-button:nth-child(3){display:none}.scene-grid{grid-template-rows:auto minmax(310px,46vh) auto}.character-field{min-height:310px}.scene-copy h2{font-size:1.52rem}.professor-owl{width:84px}.sigma{width:72px}.cricket{width:103px}.little-ant{width:94px}.character-tag small{display:none}.learning-surface{padding:.9rem}.surface-actions{flex-direction:column-reverse}.bamboo{opacity:.34}.village-roofs{display:none}.flower-bed{opacity:.34}.seed-one{left:56%;top:51%}.seed-two{left:64%;top:54%}}

/* Soft environmental matting for canonical source renders that include studio halos. */
.sigma img{
  -webkit-mask-image:radial-gradient(ellipse 58% 59% at 50% 50%,#000 0 71%,rgba(0,0,0,.98) 80%,transparent 100%);
  mask-image:radial-gradient(ellipse 58% 59% at 50% 50%,#000 0 71%,rgba(0,0,0,.98) 80%,transparent 100%);
}
.little-ant img{
  -webkit-mask-image:radial-gradient(ellipse 60% 58% at 50% 51%,#000 0 73%,rgba(0,0,0,.98) 82%,transparent 100%);
  mask-image:radial-gradient(ellipse 60% 58% at 50% 51%,#000 0 73%,rgba(0,0,0,.98) 82%,transparent 100%);
}


/* ==========================================================
   SIGMA CHARACTER LIVELINESS v1.4
   Subtle acting, intentional orientation, environmental contact.
   v1.3 scene layout remains intact.
   ========================================================== */
.sr-only{position:absolute!important;width:1px!important;height:1px!important;padding:0!important;margin:-1px!important;overflow:hidden!important;clip:rect(0,0,0,0)!important;white-space:nowrap!important;border:0!important}
.character{--reaction-lift:0px;--reaction-scale:1;--reaction-tilt:0deg}
.character-body{position:relative;z-index:3;transform-origin:50% 88%;transform:translate3d(var(--pose-x,0px),var(--pose-y,0px),0) rotate(var(--pose-tilt,0deg)) scale(calc(var(--pose-scale,1) * var(--reaction-scale,1)));transition:transform .72s var(--ease),filter .65s var(--ease)}
.character-body img{position:relative;z-index:2;transform-origin:50% 84%;will-change:transform;animation:living-breath 6.8s ease-in-out infinite}
.character:nth-of-type(2) .character-body img{animation-duration:7.4s;animation-delay:-1.9s}
.cricket .character-body img{animation-name:living-alert;animation-duration:6.2s;animation-delay:-2.7s}
.little-ant .character-body img{animation-name:living-consider;animation-duration:7.1s;animation-delay:-3.2s}
.professor-owl .character-body img{animation-name:living-listen;animation-duration:8.4s;animation-delay:-4.1s}
.character-aura{position:absolute;z-index:0;left:17%;right:17%;top:18%;bottom:12%;border-radius:48%;opacity:0;background:radial-gradient(ellipse,rgba(255,221,140,.24),rgba(91,223,255,.1) 44%,transparent 70%);filter:blur(15px);transition:opacity .6s var(--ease),transform .7s var(--ease)}
.environment-contact{position:absolute;z-index:0;left:10%;right:10%;bottom:-1%;height:17%;transform-origin:50% 70%;transition:transform .7s var(--ease),filter .7s var(--ease),opacity .7s var(--ease)}
.professor-owl .environment-contact{left:8%;right:7%;height:19%;bottom:-1%;border-radius:50% 50% 36% 38%;background:linear-gradient(170deg,#70816f 0%,#3a5144 48%,#18332e 100%);box-shadow:inset 0 7px 9px rgba(255,255,255,.12),0 12px 22px rgba(0,0,0,.26);opacity:.88}
.sigma .environment-contact{left:5%;right:5%;bottom:0;height:12%;border:2px solid rgba(105,232,255,.34);border-radius:50%;background:radial-gradient(ellipse,rgba(70,205,232,.19),transparent 66%);box-shadow:0 0 25px rgba(64,211,239,.13);animation:sigma-ground-ripple 6.8s ease-out infinite}
.cricket .environment-contact{left:3%;right:1%;bottom:-2%;height:18%;border-radius:70% 24% 72% 25%;background:linear-gradient(155deg,#72a94c 0%,#315f37 54%,#173b2f 100%);box-shadow:inset 0 5px 8px rgba(225,255,186,.18),0 14px 20px rgba(0,0,0,.26);transform:rotate(-4deg)}
.cricket .environment-contact::after{content:"";position:absolute;left:12%;right:10%;top:47%;height:2px;background:rgba(213,242,165,.26);transform:rotate(-6deg);box-shadow:31px -4px 0 -1px rgba(213,242,165,.17)}
.little-ant .environment-contact{left:5%;right:5%;bottom:-2%;height:17%;border-radius:48% 58% 43% 52%;background:linear-gradient(165deg,#7d7657 0%,#4a523d 44%,#20352d 100%);box-shadow:inset 0 6px 8px rgba(255,239,186,.1),0 13px 21px rgba(0,0,0,.28);opacity:.9}
.little-ant .environment-contact::after{content:"";position:absolute;right:8%;top:10%;width:26%;height:23%;border-radius:50%;background:rgba(87,139,70,.68);filter:blur(.3px)}
.character[data-gaze="ant"] .character-body{--gaze-bias:1}
.character[data-gaze="cricket"] .character-body{--gaze-bias:-1}
.character[data-gaze="learner"] .character-aura{background:radial-gradient(ellipse,rgba(113,230,255,.2),transparent 68%)}
.character[data-mood="delighted"] .character-aura,.character[data-mood="kind"] .character-aura,.character[data-mood="hopeful"] .character-aura{opacity:.48}
.character[data-mood="focused"] .character-aura,.character[data-mood="encouraged"] .character-aura{opacity:.34}
.app-shell[data-active-character="owl"] .professor-owl .character-tag,.app-shell[data-active-character="sigma"] .sigma .character-tag,.app-shell[data-active-character="cricket"] .cricket .character-tag,.app-shell[data-active-character="ant"] .little-ant .character-tag{opacity:1;border-color:rgba(246,212,123,.46);box-shadow:0 0 22px rgba(246,212,123,.1)}
.app-shell[data-phase="retry"] .character-body{--reaction-scale:.985}
.app-shell[data-phase="retry"] .character-aura{opacity:.08}
.app-shell[data-phase="retry"] .knowledge-anchor{filter:saturate(.82) brightness(.92)}
.app-shell[data-phase="retry"] .professor-owl .character-body{transform:translate3d(var(--pose-x,0px),calc(var(--pose-y,0px) - 2px),0) rotate(calc(var(--pose-tilt,0deg) + 1deg)) scale(calc(var(--pose-scale,1) * .995))}
.app-shell[data-phase="retry"] .sigma .character-body{transform:translate3d(calc(var(--pose-x,0px) + 2px),var(--pose-y,0px),0) rotate(var(--pose-tilt,0deg)) scale(calc(var(--pose-scale,1) * .99))}
.app-shell[data-phase="correct"] .character-aura{opacity:.62;transform:scale(1.08)}
.app-shell[data-phase="correct"] .cricket .character-body,.app-shell[data-phase="correct"] .little-ant .character-body{--reaction-scale:1.025}
.app-shell[data-phase="correct"] .cricket .environment-contact{transform:rotate(-2deg) scaleY(.94)}
.app-shell[data-phase="correct"] .little-ant .environment-contact{transform:scaleX(1.04)}
.app-shell[data-phase="memory"] .character-body{--reaction-scale:.995}
.app-shell[data-phase="memory"] .character-aura{opacity:.24;transform:scale(.98)}
.app-shell[data-phase="memory"] .character-body img{animation-duration:10s}
.app-shell[data-phase="complete"] .character-aura{opacity:.5;transform:scale(1.12)}
.app-shell[data-phase="complete"] .character-body img{animation-name:living-complete;animation-duration:7.8s}
.app-shell.is-transitioning .character-body{filter:brightness(1.06);transform:translate3d(var(--pose-x,0px),calc(var(--pose-y,0px) - 5px),0) rotate(var(--pose-tilt,0deg)) scale(calc(var(--pose-scale,1) * .99))}
.app-shell.is-transitioning .path-spark{opacity:1;filter:brightness(1.35)}
.app-shell[data-scene-id="1"] .cricket .environment-contact{transform:rotate(-6deg) scaleX(1.03)}
.app-shell[data-scene-id="2"] .cricket .environment-contact{transform:rotate(-1deg) scaleX(1.06)}
.app-shell[data-scene-id="2"] .little-ant .environment-contact{transform:translateX(-3px) scaleX(1.02)}
.app-shell[data-scene-id="3"] .sigma .environment-contact{transform:scale(1.16)}
.app-shell[data-scene-id="3"] .professor-owl .environment-contact{filter:brightness(1.05)}
.app-shell[data-scene-id="4"] .little-ant .environment-contact{transform:translateX(-7px) scaleX(1.08)}
.app-shell[data-scene-id="4"] .cricket .environment-contact{transform:rotate(1deg) scaleX(1.03)}
@keyframes living-breath{0%,100%{transform:translate3d(0,0,0) rotate(-.15deg) scale(1)}48%{transform:translate3d(0,-2px,0) rotate(.25deg) scale(1.004)}52%{transform:translate3d(0,-2px,0) rotate(.18deg) scale(1.004)}}
@keyframes living-alert{0%,100%{transform:translate3d(0,0,0) rotate(-.25deg)}44%{transform:translate3d(1px,-2px,0) rotate(.35deg)}52%{transform:translate3d(2px,-3px,0) rotate(.55deg)}60%{transform:translate3d(0,-1px,0) rotate(.1deg)}}
@keyframes living-consider{0%,100%{transform:translate3d(0,0,0) rotate(.15deg)}46%{transform:translate3d(-1px,-1px,0) rotate(-.35deg)}54%{transform:translate3d(-2px,-1px,0) rotate(-.55deg)}62%{transform:translate3d(0,0,0) rotate(0)}}
@keyframes living-listen{0%,100%{transform:translate3d(0,0,0) scale(1)}47%{transform:translate3d(0,-1px,0) scale(1.003)}54%{transform:translate3d(1px,-1px,0) rotate(.18deg) scale(1.003)}}
@keyframes living-complete{0%,100%{transform:translate3d(0,0,0) scale(1)}50%{transform:translate3d(0,-3px,0) scale(1.006)}}
@keyframes sigma-ground-ripple{0%,100%{opacity:.25;transform:scale(.84)}50%{opacity:.55;transform:scale(1.05)}}
@media(max-width:640px){.character-aura{filter:blur(10px)}.environment-contact{height:15%}.professor-owl .environment-contact{height:17%}.brand-logo{object-position:50% 30%}}
@media(prefers-reduced-motion:reduce){.character-body img,.sigma .environment-contact{animation:none!important}}
.app-shell[data-motion="reduced"] .character-body img,.app-shell[data-motion="reduced"] .sigma .environment-contact{animation:none!important}
.app-shell[data-motion="reduced"] .character-body{transition:none!important}
.app-shell[data-contrast="high"] .character-aura{opacity:.12!important}.app-shell[data-contrast="high"] .environment-contact{filter:contrast(1.3)}

/* ==========================================================
   SIGMA MULTI-LESSON ENGINE v1.5
   Reusable lesson catalog, world presets, and multi-domain theming.
   ========================================================== */
.lesson-picker-button{min-height:42px;padding:0 .9rem;border-radius:999px;border:1px solid rgba(246,212,123,.35);color:var(--gold);background:rgba(246,212,123,.07);font-size:.72rem;font-weight:750;letter-spacing:.1em;cursor:pointer;transition:border-color .2s var(--ease),background .2s var(--ease),transform .2s var(--ease)}
.lesson-picker-button:hover{border-color:rgba(246,212,123,.72);background:rgba(246,212,123,.13);transform:translateY(-1px)}
.lesson-catalog{width:min(860px,calc(100% - 2rem));max-height:min(760px,calc(100svh - 2rem));padding:0;border:1px solid rgba(246,212,123,.35);border-radius:28px;color:var(--ink);background:rgba(2,12,19,.98);box-shadow:0 36px 110px rgba(0,0,0,.66);overflow:auto}
.lesson-catalog::backdrop{background:rgba(0,7,12,.78);backdrop-filter:blur(8px)}
.catalog-shell{padding:clamp(1rem,3vw,2rem)}.catalog-header{display:flex;align-items:flex-start;justify-content:space-between;gap:1rem}.catalog-kicker{margin:0 0 .35rem;color:var(--gold);font-size:.68rem;letter-spacing:.16em}.catalog-header h2{margin:0;font-size:clamp(1.5rem,3vw,2.3rem)}.catalog-intro{margin:.65rem 0 1.35rem;color:var(--muted)}
.catalog-close{width:42px;height:42px;border-radius:50%;border:1px solid rgba(255,255,255,.14);color:var(--ink);background:rgba(255,255,255,.06);font-size:1.45rem;cursor:pointer}
.catalog-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1rem}.lesson-card{min-height:190px;padding:1.15rem;border-radius:22px;border:1px solid rgba(255,255,255,.1);color:var(--ink);background:linear-gradient(145deg,rgba(16,54,63,.75),rgba(3,18,27,.95));text-align:left;cursor:pointer;display:grid;grid-template-columns:auto 1fr auto;gap:.9rem;align-items:start;transition:transform .25s var(--ease),border-color .25s var(--ease),background .25s var(--ease)}.lesson-card:hover{transform:translateY(-4px);border-color:rgba(113,230,255,.48);background:linear-gradient(145deg,rgba(22,77,87,.82),rgba(4,25,36,.98))}.lesson-card[data-current="true"]{border-color:rgba(246,212,123,.66);box-shadow:inset 0 0 0 1px rgba(246,212,123,.18)}
.lesson-card-icon{display:grid;place-items:center;width:48px;height:48px;border-radius:16px;background:rgba(113,230,255,.1);font-size:1.45rem}.lesson-card-copy{display:grid;gap:.42rem}.lesson-card-copy strong{font-size:1.02rem;line-height:1.25}.lesson-card-copy small{color:var(--muted);font-style:normal}.lesson-card-copy em{margin-top:.25rem;color:var(--gold);font-style:normal;font-size:.68rem;letter-spacing:.08em}.lesson-card-arrow{align-self:end;color:var(--cyan);font-size:1.35rem}

/* World preset: Healing Garden */
.app-shell[data-world="healing-garden"] .world-sky{background:linear-gradient(180deg,#08273d 0%,#2f6d71 56%,#a9b67a 100%)}
.app-shell[data-world="healing-garden"] .far-hills{background:linear-gradient(180deg,rgba(46,119,78,.84),#1f664f)}
.app-shell[data-world="healing-garden"] .bank-back{background:linear-gradient(#4f985b,#205f48)}
.app-shell[data-world="healing-garden"] .bank-front{background:linear-gradient(#2f7549 0%,#154a39 54%,#092d28 100%)}
.app-shell[data-world="healing-garden"] .stream{background:linear-gradient(180deg,rgba(94,197,191,.66),rgba(14,98,102,.92) 55%,#052b35)}
.app-shell[data-world="healing-garden"] .village-roofs{opacity:.18;filter:hue-rotate(35deg)}
.app-shell[data-world="healing-garden"] .flower-bed{opacity:.95;filter:saturate(1.15)}
.app-shell[data-world="healing-garden"] .sun-or-moon{background:radial-gradient(circle at 40% 35%,#fffbd4,#ffe88f 58%,#e8ad4b);box-shadow:0 0 65px rgba(255,232,143,.55),0 0 180px rgba(214,243,160,.18)}
.app-shell[data-world="healing-garden"] .knowledge-anchor{--anchor-color:#b9f78a}

/* World preset: Fraction Harbor */
.app-shell[data-world="fraction-harbor"] .world-sky{background:linear-gradient(180deg,#061b3b 0%,#163f67 57%,#6c8495 100%)}
.app-shell[data-world="fraction-harbor"] .far-hills{background:linear-gradient(180deg,rgba(39,82,106,.82),#173f55);clip-path:polygon(0 72%,12% 42%,23% 58%,36% 34%,49% 61%,63% 39%,77% 58%,89% 45%,100% 70%,100% 100%,0 100%)}
.app-shell[data-world="fraction-harbor"] .village-roofs{opacity:.12}.app-shell[data-world="fraction-harbor"] .bamboo{opacity:.26;filter:hue-rotate(120deg) saturate(.55)}
.app-shell[data-world="fraction-harbor"] .bank-back{background:linear-gradient(#395f66,#1b4656)}.app-shell[data-world="fraction-harbor"] .bank-front{background:linear-gradient(#294f5f 0%,#123847 54%,#071f2d 100%)}
.app-shell[data-world="fraction-harbor"] .stream{background:linear-gradient(180deg,rgba(83,165,213,.76),rgba(21,83,139,.94) 55%,#061a35)}
.app-shell[data-world="fraction-harbor"] .stone-bridge{background:linear-gradient(#d2c49b,#80745c);box-shadow:0 18px 28px rgba(0,0,0,.35),0 0 28px rgba(113,230,255,.08)}
.app-shell[data-world="fraction-harbor"] .flower-bed{opacity:.25;filter:hue-rotate(140deg)}
.app-shell[data-world="fraction-harbor"] .sun-or-moon{background:radial-gradient(circle at 40% 35%,#f8fbff,#a4d9ff 58%,#4f89c3);box-shadow:0 0 60px rgba(164,217,255,.5),0 0 170px rgba(87,154,220,.2)}
.app-shell[data-world="fraction-harbor"] .knowledge-anchor{--anchor-color:#f6d47b}
.app-shell[data-world="fraction-harbor"] .shared-seed{font-family:Georgia,serif;font-size:clamp(1.6rem,3vw,2.55rem);font-weight:700}

/* Subtle world-specific knowledge material */
.app-shell[data-world="healing-garden"] .shared-seed{color:#d7ffae;text-shadow:0 0 20px rgba(182,255,118,.65)}
.app-shell[data-world="fraction-harbor"] .shared-seed{color:#fff0b2;text-shadow:0 0 22px rgba(246,212,123,.64)}
.app-shell[data-world="healing-garden"][data-phase="correct"] .world-particles{filter:hue-rotate(55deg);opacity:.72}
.app-shell[data-world="fraction-harbor"][data-phase="correct"] .ripple{border-color:rgba(246,212,123,.55)}

@media(max-width:980px){.topbar{grid-template-columns:minmax(180px,.8fr) minmax(240px,1.5fr) auto}.lesson-picker-button{padding:0 .68rem;font-size:.64rem}.catalog-grid{grid-template-columns:1fr}.lesson-card{min-height:128px}}
@media(max-width:640px){.top-actions{gap:.32rem}.lesson-picker-button{min-height:38px;padding:0 .58rem;font-size:.58rem;letter-spacing:.06em}.lesson-catalog{width:calc(100% - 1rem);max-height:calc(100svh - 1rem);border-radius:22px}.catalog-shell{padding:1rem}.lesson-card{min-height:112px;padding:.9rem}.lesson-card-icon{width:42px;height:42px}.catalog-header h2{font-size:1.45rem}}
@media(max-width:420px){.lesson-picker-button{font-size:0;width:40px;height:40px;padding:0;border-radius:50%}.lesson-picker-button::before{content:'≡';font-size:1.05rem}.lesson-card-copy strong{font-size:.94rem}.lesson-card-copy em{font-size:.62rem}}
@media(max-width:640px){
  .topbar{grid-template-columns:auto minmax(0,1fr) auto;min-height:76px;align-items:center}
  .lesson-identity{min-width:0;overflow:hidden}
  .lesson-identity h1{white-space:normal;overflow-wrap:anywhere;word-break:normal;line-height:1.08;max-width:100%}
  #contrastButton{display:none!important}
  #motionButton{display:inline-grid!important;place-items:center}
}
@media(max-width:420px){
  .topbar{gap:.42rem;padding-inline:.45rem}
  .brand-logo{width:48px;height:48px}
  .lesson-identity h1{font-size:.78rem}
  .eyebrow{font-size:.48rem;letter-spacing:.08em}
  .icon-button{width:36px;height:36px}
}