:root{--bg:#0b0e1a;--bg2:#111527;--card:#171c33;--card2:#1e2442;--border:#2a3154;--text:#eef1ff;--muted:#9aa3c7;--accent:#8b5cf6;--pink:#ec4899;--cyan:#06b6d4;--green:#22c55e;--orange:#f59e0b;--red:#ef4444;--radius:18px;--font:"Nunito","SF Pro Rounded",ui-rounded,-apple-system,"Segoe UI",system-ui,sans-serif;--mono:"SF Mono",ui-monospace,"Cascadia Code",Menlo,Consolas,monospace}*{box-sizing:border-box}html,body{background:var(--bg);color:var(--text);font-family:var(--font);margin:0;padding:0;font-size:16px;line-height:1.55}#root{min-height:100vh}body{background:radial-gradient(1000px 500px at 85% -10%,#8b5cf629,transparent 60%),radial-gradient(800px 400px at -10% 30%,#06b6d41a,transparent 60%),var(--bg);background-attachment:fixed}a{color:inherit;text-decoration:none}button{font-family:var(--font)}.container{max-width:980px;margin:0 auto;padding:0 20px 80px}.header{position:sticky;z-index:20;backdrop-filter:blur(14px);border-bottom:1px solid var(--border);background:#0b0e1acc;top:0}.header-inner{display:flex;align-items: center;gap:16px;max-width:980px;margin:0 auto;padding:12px 20px}.logo{letter-spacing:-.5px;background:linear-gradient(90deg,var(--accent),var(--pink),var(--orange));color:#0000;white-space:nowrap;-webkit-background-clip:text;background-clip:text;font-size:22px;font-weight:900}.header-stats{display:flex;align-items: center;gap:10px;margin-left:auto}.chip{display:inline-flex;background:var(--card);border:1px solid var(--border);white-space:nowrap;border-radius:999px;align-items: center;gap:6px;padding:6px 12px;font-size:14px;font-weight:800}.chip.xp{color:var(--orange)}.chip.streak{color:var(--red)}.chip.streak.cold{filter:grayscale(1);opacity:.6}.avatar-btn{border:2px solid var(--accent);background:var(--card2);color:var(--text);cursor:pointer;border-radius:50%;width:38px;height:38px;font-size:15px;font-weight:900}.menu{position:absolute;background:var(--card2);border:1px solid var(--border);overflow:hidden;border-radius:14px;min-width:200px;top:58px;right:20px;box-shadow:0 16px 40px #00000080}.menu button,.menu a{display:block;color:var(--text);text-align:left;cursor:pointer;background:0 0;border:none;width:100%;padding:12px 16px;font-size:15px;font-weight:700}.menu button:hover,.menu a:hover{background:var(--card)}.levelbar{display:flex;flex-direction:column;gap:4px;min-width:130px}.levelbar .label{color:var(--muted);display:flex;justify-content:space-between;gap:8px;font-size:12px;font-weight:800}.bar{background:var(--card);overflow:hidden;border-radius:99px;height:8px}.bar>div{background:linear-gradient(90deg,var(--accent),var(--pink));border-radius:99px;height:100%;transition:width .6s cubic-bezier(.22,1,.36,1)}.hero{text-align:center;padding:42px 0 26px}.hero h1{letter-spacing:-1px;margin:0 0 6px;font-size:34px;font-weight:900}.hero p{color:var(--muted);margin:0;font-weight:600}.course-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px;margin-top:24px}.course-card{position:relative;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);display:flex;overflow:hidden;flex-direction:column;gap:10px;padding:18px;transition:transform .15s,border-color .15s}.course-card:hover{border-color:var(--cc,var(--accent));transform:translateY(-3px)}.course-card:before{content:"";position:absolute;background:var(--cc,var(--accent));height:4px;inset:0 0 auto}.course-card .top{display:flex;align-items: center;gap:12px}.course-emoji{display:grid;background:color-mix(in srgb,var(--cc,var(--accent))18%,transparent);border-radius:16px;place-items: center;width:52px;height:52px;font-size:28px}.course-card h3{margin:0;font-size:17px;font-weight:900;line-height:1.25}.course-card .num{color:var(--muted);font-size:12px;font-weight:800}.course-card p.desc{color:var(--muted);display:-webkit-box;-webkit-line-clamp:2;overflow:hidden;-webkit-box-orient:vertical;margin:0;font-size:13.5px;font-weight:600}.course-card .meta{display:flex;color:var(--muted);align-items: center;gap:10px;font-size:12.5px;font-weight:800}.course-card .done-badge{color:var(--green)}.course-head{display:flex;align-items: center;gap:18px;padding:34px 0 10px}.course-head .course-emoji{width:72px;height:72px;font-size:40px}.course-head h1{letter-spacing:-.5px;margin:0;font-size:28px;font-weight:900}.course-head p{color:var(--muted);margin:4px 0 0;font-weight:600}.lesson-list{display:flex;flex-direction:column;gap:12px;margin-top:20px}.lesson-row{display:flex;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);align-items: center;gap:14px;padding:16px 18px;transition:border-color .15s,transform .15s}.lesson-row:hover{border-color:var(--cc,var(--accent));transform:translate(4px)}.lesson-row .state{display:grid;background:var(--card2);border:2px solid var(--border);border-radius:50%;flex:none;place-items: center;width:42px;height:42px;font-weight:900}.lesson-row .state.done{background:color-mix(in srgb,var(--green)25%,transparent);border-color:var(--green)}.lesson-row .state.next{border-color:var(--cc,var(--accent));box-shadow:0 0 14px color-mix(in srgb,var(--cc,var(--accent))55%,transparent)}.lesson-row h3{margin:0;font-size:16px;font-weight:800}.lesson-row .sub{color:var(--muted);font-size:12.5px;font-weight:700}.lesson-row .go{color:var(--cc,var(--accent));white-space:nowrap;margin-left:auto;font-weight:900}.player-top{display:flex;align-items: center;gap:14px;padding:16px 0}.player-top .close{color:var(--muted);cursor:pointer;background:0 0;border:none;font-size:22px}.player-top .bar{flex:1;height:12px}.player-top .step-count{color:var(--muted);white-space:nowrap;font-size:13px;font-weight:800}.step-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);animation:pop-in .25s cubic-bezier(.22,1,.36,1);margin-top:8px;padding:26px}@keyframes pop-in{0%{opacity:0;transform:translateY(10px)scale(.99)}to{opacity:1;transform:none}}.md p{margin:0 0 12px}.md p:last-child{margin-bottom:0}.md code,.step-card code{font-family:var(--mono);background:var(--bg2);border:1px solid var(--border);color:#a5f3fc;border-radius:6px;padding:1px 6px;font-size:.92em}.md pre.md-code{background:var(--bg2);border:1px solid var(--border);overflow-x:auto;border-radius:12px;margin:0 0 12px;padding:14px 16px}.md pre.md-code code{color:#c9d4ff;background:0 0;border:none;padding:0}.step-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px}.btn{cursor:pointer;color:#fff;background:var(--card2);border:none;border-radius:14px;padding:13px 22px;transition:transform .1s,filter .15s;font-size:15px;font-weight:900}.btn:active{transform:scale(.97)}.btn:disabled{opacity:.45;cursor:not-allowed}.btn.primary{background:linear-gradient(90deg,var(--accent),var(--pink));box-shadow:0 6px 20px #8b5cf659}.btn.green{background:linear-gradient(90deg,#16a34a,var(--green));box-shadow:0 6px 20px #22c55e4d}.btn.ghost{border:2px solid var(--border);color:var(--muted);background:0 0}.btn.ghost:hover{color:var(--text);border-color:var(--muted)}.options{display:flex;flex-direction:column;gap:10px;margin-top:16px}.option{text-align:left;background:var(--card2);border:2px solid var(--border);color:var(--text);cursor:pointer;font-size:15px;font-weight:700;font-family:var(--font);border-radius:14px;padding:14px 16px;transition:border-color .12s,background .12s}.option:hover:not(:disabled){border-color:var(--accent)}.option.selected{border-color:var(--accent);background:color-mix(in srgb,var(--accent)14%,var(--card2))}.option.correct{border-color:var(--green);background:color-mix(in srgb,var(--green)16%,var(--card2))}.option.wrong{border-color:var(--red);background:color-mix(in srgb,var(--red)14%,var(--card2));animation:shake .35s}.option code{font-family:var(--mono)}@keyframes shake{20%{transform:translate(-5px)}50%{transform:translate(5px)}80%{transform:translate(-3px)}}.gap-code{font-family:var(--mono);background:var(--bg2);border:1px solid var(--border);white-space:pre-wrap;border-radius:12px;margin-top:14px;padding:16px;font-size:15px}.gap-slot{display:inline-block;border-bottom:3px dashed var(--accent);text-align:center;color:var(--accent);min-width:70px;font-weight:800}.gap-slot.filled{border-bottom-style:solid}.chips{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}.chip-option{font-family:var(--mono);border:2px solid var(--border);background:var(--card2);color:var(--text);cursor:pointer;border-radius:12px;padding:10px 16px;font-size:14px;font-weight:700}.chip-option:hover:not(:disabled){border-color:var(--accent)}.chip-option.correct{border-color:var(--green);background:color-mix(in srgb,var(--green)16%,var(--card2))}.chip-option.wrong{border-color:var(--red);animation:shake .35s}.feedback{animation:pop-in .2s ease;border-radius:14px;margin-top:16px;padding:14px 16px;font-size:14.5px;font-weight:700}.feedback.good{background:color-mix(in srgb,var(--green)14%,transparent);border:1px solid var(--green)}.feedback.bad{background:color-mix(in srgb,var(--red)12%,transparent);border:1px solid var(--red)}.feedback.hint{background:color-mix(in srgb,var(--orange)12%,transparent);border:1px solid var(--orange)}.editor-wrap{border:1px solid var(--border);overflow:hidden;border-radius:14px;margin-top:16px}.editor-wrap .cm-editor{font-size:14.5px}.editor-wrap .cm-editor.cm-focused{outline:none}.editor-wrap .cm-scroller{font-family:var(--mono);line-height:1.6}.console{border:1px solid var(--border);font-family:var(--mono);white-space:pre-wrap;overflow-y:auto;background:#05070d;border-radius:14px;min-height:52px;max-height:260px;margin-top:12px;padding:14px 16px;font-size:14px}.console .label{color:var(--muted);font-size:11px;font-weight:800;font-family:var(--font);text-transform:uppercase;letter-spacing:1px;display:block;margin-bottom:6px}.console .err{color:#fca5a5}.console .err-help{color:var(--orange);font-family:var(--font);display:block;margin-top:8px;font-weight:700}.console .empty{color:var(--muted);font-style:italic}.check-list{display:flex;flex-direction:column;gap:6px;margin-top:12px}.check-item{display:flex;align-items:baseline;gap:8px;font-size:14px;font-weight:700}.check-item.ok{color:var(--green)}.check-item.fail{color:var(--red)}.finish{text-align:center;animation:pop-in .35s ease;padding:60px 20px}.finish .big{font-size:72px}.finish h2{margin:10px 0 6px;font-size:30px;font-weight:900}.finish p{color:var(--muted);margin:0 0 24px;font-weight:700}.finish .xp-gain{display:inline-block;color:var(--orange);background:color-mix(in srgb,var(--orange)14%,transparent);border:1px solid var(--orange);border-radius:999px;margin-bottom:26px;padding:10px 24px;font-size:22px;font-weight:900}.start-wrap{display:grid;place-items: center;min-height:100vh;padding:24px}.start-card{background:var(--card);border:1px solid var(--border);text-align:center;border-radius:24px;width:100%;max-width:420px;padding:34px}.start-card .mega{font-size:56px}.start-card h1{letter-spacing:-1px;background:linear-gradient(90deg,var(--accent),var(--pink),var(--orange));color:#0000;-webkit-background-clip:text;background-clip:text;margin:6px 0 4px;font-size:34px;font-weight:900}.start-card .tagline{color:var(--muted);margin:0 0 24px;font-weight:700}.start-card form{display:flex;flex-direction:column;gap:12px}.input{background:var(--bg2);border:2px solid var(--border);color:var(--text);font-size:15px;font-weight:700;font-family:var(--font);outline:none;border-radius:14px;padding:13px 16px}.input:focus{border-color:var(--accent)}.start-card .swap{color:var(--muted);margin-top:16px;font-size:14px;font-weight:700}.start-card .swap button{color:var(--accent);cursor:pointer;background:0 0;border:none;font-size:14px;font-weight:900}.form-error{color:#fca5a5;margin:0;font-size:14px;font-weight:700}.lb-list{display:flex;flex-direction:column;gap:10px;margin-top:20px}.lb-row{display:flex;background:var(--card);border:1px solid var(--border);border-radius:14px;align-items: center;gap:14px;padding:13px 18px;font-weight:800}.lb-row .platz{color:var(--muted);width:36px;font-size:18px;font-weight:900}.lb-row.top1 .platz,.lb-row.top2 .platz,.lb-row.top3 .platz{font-size:22px}.lb-row .xp{color:var(--orange);margin-left:auto}.lb-row.me{border-color:var(--accent);background:color-mix(in srgb,var(--accent)10%,var(--card))}.toast{position:fixed;background:var(--card2);border:1px solid var(--accent);z-index:50;animation:toast-in .3s cubic-bezier(.22,1,.36,1);border-radius:999px;padding:12px 24px;font-weight:900;bottom:26px;left:50%;transform:translate(-50%);box-shadow:0 12px 40px #00000080}@keyframes toast-in{0%{opacity:0;transform:translate(-50%,20px)}to{opacity:1;transform:translate(-50%)}}.loading-screen{display:grid;color:var(--muted);place-items: center;min-height:60vh;font-weight:800}.spin{display:inline-block;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.py-boot{display:flex;color:var(--muted);align-items: center;gap:8px;margin-top:10px;font-size:13px;font-weight:700}@media (max-width:640px){.levelbar{display:none}.hero h1{font-size:26px}.step-card{padding:18px}}