:root{--bg:#f6f7fb;--ink:#1e1f3b;--mute:#6b6f8d;--card:#fff;--line:#e6e8f3;--brand:#6C5CE7;--shadow:0 10px 30px rgba(60,50,140,.1)}@media(prefers-color-scheme:dark){:root{--bg:#0f1020;--ink:#f1f2ff;--mute:#a4a8c9;--card:#1a1b34;--line:#2a2c4d;--shadow:0 10px 30px rgba(0,0,0,.4)}}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:ui-rounded,Nunito,Segoe UI,system-ui,sans-serif;background:var(--bg);color:var(--ink);line-height:1.55;min-height:100vh}a{color:inherit;text-decoration:none}.blobs i{position:fixed;z-index:-1;border-radius:50%;filter:blur(90px);opacity:.35}.blobs i:nth-child(1){width:380px;height:380px;background:#6c5ce7;top:-100px;left:-80px}.blobs i:nth-child(2){width:320px;height:320px;background:#00cec9;top:30%;right:-100px}.blobs i:nth-child(3){width:300px;height:300px;background:#fd79a8;bottom:-80px;left:30%}.nav{position:sticky;top:0;z-index:10;display:flex;justify-content:space-between;align-items:center;padding:12px 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i{aspect-ratio:1;background:#a8e6ff;border-radius:6px;display:grid;place-items:center;font-style:normal;font-size:1.5rem}.dpad{display:flex;gap:8px;justify-content:center;flex-wrap:wrap}.dpad button{padding:10px 16px;border-radius:12px;border:2px solid var(--line);background:var(--card);color:var(--ink);font:inherit;font-weight:800;cursor:pointer}.volc{position:relative;height:190px;text-align:center}.mtn{font-size:8rem;line-height:1;padding-top:40px}#lv{position:absolute;left:50%;top:50px}.lava{position:absolute;width:12px;height:12px;border-radius:50%;background:#ff7a18;box-shadow:0 0 8px #ff3d00;animation:lava 1.4s ease-out forwards}@keyframes 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span{position:absolute;bottom:0;font-size:1.8rem;animation:rise 1.8s ease-out forwards}.sky{position:relative;height:170px;border-radius:18px;overflow:hidden;transition:background .4s}.orb2{position:absolute;font-size:2.6rem;transform:translate(-50%,-50%);transition:.2s}.ground{position:absolute;bottom:0;left:0;right:0;height:42px;background:#27ae60;text-align:center;font-size:1.8rem}.more{display:block;margin:22px auto 0}.lesson h1{margin:2px 0;font-size:clamp(1.5rem,4vw,2.1rem);line-height:1.2;letter-spacing:0}.lesson .quiz{box-shadow:none;margin:20px 0 0;padding:20px;max-width:none;border-radius:20px}.quiz-page{max-width:720px;margin:20px auto}.quiz-page h1{font-size:clamp(1.8rem,5vw,2.4rem);margin:0 0 6px}[hidden]{display:none!important}.card{color:inherit}.peek{margin:0 0 44px}.peek-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}.peek-head h2{margin:0;font-size:1.5rem}.sl-btns{display:flex;gap:8px}.sl-btns 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summary::-webkit-details-marker{display:none}.mgroup summary:hover,.mgroup[open] summary{background:var(--card);box-shadow:var(--shadow)}.mdrop{position:absolute;top:calc(100% + 6px);left:0;min-width:210px;background:var(--card);border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow);padding:8px;display:flex;flex-direction:column;z-index:20}.mdrop a{padding:8px 12px;border-radius:10px;font-weight:600;white-space:nowrap}.mdrop a:hover{background:var(--bg)}.foot p{margin:4px 0}.foot a{text-decoration:underline}.legal h3{margin:22px 0 4px}.legal p{margin:0}@media(max-width:760px){.menu{order:3;flex-basis:100%;justify-content:flex-start}.mdrop{position:fixed;left:16px;right:16px;top:auto;margin-top:6px}}