:root{--bg:#f6f7fb;--paper:#fff;--ink:#172033;--muted:#697188;--line:#dfe3ed;--purple:#6d5dfc;--yellow:#ffd166;--mint:#44c7a1;--pink:#ff6f91;--code:#151a2d}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.6 Nunito,sans-serif}button,input{font:inherit}button{cursor:pointer}header{height:72px;position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--paper) 92%,transparent);backdrop-filter:blur(14px);border-bottom:1px solid var(--line);display:flex;align-items:center;padding:0 28px;gap:28px}.brand{display:flex;align-items:center;gap:11px;color:var(--ink);text-decoration:none;font-weight:900;min-width:215px}.brand b,footer>b{width:39px;height:39px;border-radius:12px;background:var(--purple);color:#fff;display:grid;place-items:center;font:700 14px "DM Mono";transform:rotate(-3deg);box-shadow:4px 4px 0 var(--yellow)}.meter{display:flex;align-items:center;gap:12px;margin-left:auto;font-size:.8rem;font-weight:800;color:var(--muted)}.meter i{width:140px;height:8px;background:var(--line);border-radius:9px;overflow:hidden}.meter u{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--mint),var(--purple));transition:.3s}.theme{border:1px solid var(--line);background:var(--paper);color:var(--ink);border-radius:12px;width:41px;height:41px}.layout{display:grid;grid-template-columns:270px 1fr;max-width:1500px;margin:auto}aside{position:sticky;top:72px;height:calc(100vh - 72px);border-right:1px solid var(--line);padding:24px 18px;overflow:auto}.search{height:44px;border:1px solid var(--line);border-radius:12px;background:var(--paper);display:flex;align-items:center;padding:0 12px;gap:8px}.search input{border:0;outline:0;background:transparent;color:var(--ink);width:100%}.group{font-size:.7rem;letter-spacing:.12em;font-weight:900;color:var(--muted);margin:24px 10px 8px}.nav{width:100%;display:flex;gap:10px;border:0;background:transparent;color:var(--muted);padding:9px 10px;border-radius:9px;text-align:left;font-size:.85rem;font-weight:700}.nav:hover{color:var(--purple);background:#6d5dfc17}.nav span{font:500 .7rem "DM Mono"}.note{display:flex;gap:9px;background:#ffd16638;border:1px solid var(--yellow);padding:12px;border-radius:14px;margin-top:24px;transform:rotate(1deg);font-size:.77rem;line-height:1.4}main{min-width:0}.hero{min-height:660px;padding:72px clamp(30px,7vw,110px);position:relative;overflow:hidden}.hero:after{content:"{}";position:absolute;right:2%;top:5%;font:900 18rem "DM Mono";color:#6d5dfc10;z-index:-1;transform:rotate(8deg)}small{color:var(--purple);font-size:.75rem;letter-spacing:.14em;font-weight:900}.hero h1{font-size:clamp(2.8rem,6vw,5.5rem);line-height:.98;letter-spacing:-.055em;margin:16px 0 25px}.hero h1 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90px;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.card{background:var(--paper);border:1px solid var(--line);border-radius:18px;padding:24px;scroll-margin-top:95px;transition:.2s}.card:hover{transform:translateY(-3px);box-shadow:0 16px 40px #272a461a}.cardtop{display:flex;align-items:center;gap:12px}.icon{width:44px;height:44px;border-radius:13px;display:grid;place-items:center;background:color-mix(in srgb,var(--accent) 18%,transparent);font-size:1.25rem}.num{font:500 .7rem "DM Mono";color:var(--muted)}.card h3{font-size:1.25rem;margin:0}.check{margin-left:auto;border:1px solid var(--line);background:var(--bg);width:34px;height:34px;border-radius:50%;color:transparent;font-weight:900}.check.done{background:var(--mint);color:#082e23}.explain{color:var(--muted);min-height:72px}.analogy{background:color-mix(in srgb,var(--accent) 9%,var(--bg));border-left:3px solid var(--accent);padding:10px 12px;border-radius:0 9px 9px 0;font-size:.83rem}.minicode{position:relative;background:var(--code);border-radius:11px;color:#e8edff;padding:15px 48px 15px 15px;font:400 .76rem/1.65 "DM Mono";white-space:pre-wrap;overflow:auto;min-height:72px}.copy{position:absolute;right:8px;top:8px;border:0;background:#2a314d;color:#cbd3f4;border-radius:7px;padding:5px 8px;font-size:.68rem}.empty{text-align:center;padding:40px 20px 90px}.quiz{margin:0 clamp(30px,7vw,110px) 85px;border-radius:24px;background:linear-gradient(135deg,#201b4f,#352a83);color:#fff;padding:48px;display:grid;grid-template-columns:1fr 1.25fr;gap:50px;position:relative;overflow:hidden}.quiz small{color:var(--yellow)}.quiz p{color:#c9c4ed}.monster{font:900 6rem "DM Mono";color:var(--yellow);position:absolute;bottom:-18px}.monster 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@media(max-width:1000px){.layout{grid-template-columns:1fr}aside{position:static;height:auto;border:0;border-bottom:1px solid var(--line);padding:15px 22px}aside nav,.note{display:none}#symbolGrid{grid-template-columns:repeat(3,1fr)}.lessons{grid-template-columns:1fr}.quiz{grid-template-columns:1fr}.monster{display:none}}@media(max-width:650px){header{padding:0 16px}.brand{min-width:0}.brand span{display:none}.meter i{width:70px}.hero{padding:45px 22px;min-height:auto}.hero h1{font-size:2.8rem}.actions{flex-direction:column}.symbols,.tools{padding:45px 22px}#symbolGrid{grid-template-columns:repeat(2,1fr)}.tools{align-items:flex-start;gap:22px;flex-direction:column}.lessons{padding:0 22px 65px}.quiz{margin:0 16px 55px;padding:28px 20px}footer{padding:24px 22px}.meter>span{display:none}}