:root{--primary:#00ffcc;--primary-light:#66fff5;--primary-dark:#008080;--secondary:#00b7ff;--accent:#ff00cc;--background-dark:#050914;--glass-base:rgba(255,255,255,.05);--glass-dark-base:rgba(5,9,20,.85);--border-light:rgba(255,255,255,.2);--shadow-strength:rgba(0,0,0,.8);--neon-glow-primary:0 0 15px var(--primary-light),0 0 40px var(--primary),0 0 80px rgba(0,255,204,.3);--neon-glow-accent:0 0 12px var(--accent),0 0 30px rgba(255,0,204,.7);--text-main:#e0f0ff;--code-bg:rgba(10,15,30,.9)}*{margin:0;padding:0;box-sizing:border-box;transition:.3s cubic-bezier(.4,0,.2,1)}body{font-family:Rajdhani,sans-serif;height:100vh;overflow:hidden;display:flex;flex-direction:column;background:var(--background-dark);color:var(--text-main);position:relative}body::before{content:'';position:absolute;inset:0;background:url('data:image/svg+xml,%3Csvg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 20 20"%3E%3Cg fill="%23ffffff" fill-opacity="0.05"%3E%3Cpath d="M0 0h10v10H0V0zm10 10h10v10H10V10z"/%3E%3C/g%3E%3C/svg%3E'),url('data:image/svg+xml,%3Csvg xmlns="http://www.w3.org/2000/svg" width="100" height="100"%3E%3Crect width="100" height="2" fill="%23ffffff" fill-opacity="0.03"/%3E%3C/svg%3E');background-blend-mode:overlay;opacity:.7;z-index:1}.footer,.top-header{padding:1rem 2rem;background:var(--glass-dark-base);backdrop-filter:blur(35px) saturate(1.8);border:1px solid var(--border-light);box-shadow:0 10px 40px var(--shadow-strength);z-index:10;position:relative}.footer:hover,.top-header:hover{box-shadow:0 15px 60px var(--shadow-strength),var(--neon-glow-primary);border-color:var(--primary-light)}.top-header{font-family:Orbitron,sans-serif;font-size:1.5rem;font-weight:800;letter-spacing:3px;text-shadow:0 0 12px rgb(0 255 204 / .6);border-radius:0 0 30px 30px;display:flex;align-items:center;justify-content:center;gap:15px;background:linear-gradient(145deg,var(--glass-dark-base),rgb(5 9 20 / .9))}.top-header i{transition:transform .4s cubic-bezier(.68,-.55,.265,1.55);color:var(--primary)}.top-header:hover i{transform:rotate(360deg) scale(1.4)}.main{flex:1;display:flex;padding:1.5rem;gap:1.5rem;overflow:hidden;position:relative;z-index:5}.editor,.preview,.sidebar{padding:25px;display:flex;flex-direction:column;border-radius:25px;border:1px solid var(--border-light);box-shadow:0 10px 40px var(--shadow-strength);backdrop-filter:blur(35px) saturate(1.8);animation:.8s cubic-bezier(.22,1,.36,1) forwards panelSlideIn;opacity:0;background:var(--glass-base)}.sidebar{animation-delay:.1s;width:40%}.editor{animation-delay:.2s;width:30%;background:var(--glass-dark-base)}.preview{animation-delay:.3s;width:30%;background:#fff}.editor:hover,.preview:hover,.sidebar:hover{transform:perspective(1200px) rotateX(1deg) rotateY(1deg) translateY(-10px) scale(1.02);box-shadow:0 20px 70px var(--shadow-strength),var(--neon-glow-primary);border-color:var(--primary-light)}@keyframes panelSlideIn{from{opacity:0;transform:translateY(50px) scale(.9)}to{opacity:1;transform:none}}#lessonTitle{font-family:Orbitron,sans-serif;font-size:2.5rem;font-weight:900;background:linear-gradient(45deg,var(--primary-light),var(--accent));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:#fff0;text-shadow:0 0 10px rgb(0 255 204 / .4);margin-bottom:20px}#lessonContent{flex:1;overflow-y:auto;line-height:1.8;font-size:1.1rem;padding-right:15px;color:var(--text-main)}#lessonContent pre{background:var(--code-bg);padding:1.5em;border-radius:15px;border-left:6px solid var(--primary);margin:20px 0;color:#c0d8ff;font-family:'Fira Code',monospace;box-shadow:inset 0 0 15px rgb(0 0 0 / .6)}.editor h3,.preview-title{font-family:Orbitron,sans-serif;font-size:1.8rem;font-weight:900;margin-bottom:15px}.editor h3{color:var(--secondary);text-shadow:0 0 10px var(--shadow-strength)}.preview-title{color:#222;text-align:center}#codeEditor,#editorArea,.CodeMirror,div[contenteditable].editor-area,pre[contenteditable],textarea.editor-area{flex:1;margin-top:20px;background:var(--code-bg);color:var(--text-main);font-family:'Fira Code',monospace;font-size:15px;padding:20px;border-radius:15px;border:1px solid var(--border-light);box-shadow:inset 0 0 15px rgb(0 0 0 / .5),0 6px 30px var(--shadow-strength);line-height:1.5;outline:0;overflow:auto;white-space:pre;min-height:200px}#codeEditor:focus,#editorArea:focus,.CodeMirror-focused,div[contenteditable].editor-area:focus,pre[contenteditable]:focus,textarea.editor-area:focus{border-color:var(--accent);box-shadow:inset 0 0 15px rgb(0 0 0 / .6),var(--neon-glow-accent)}.CodeMirror{background:var(--code-bg)!important;color:var(--text-main)!important;height:auto!important}.CodeMirror-cursor{border-color:var(--primary)!important}.CodeMirror-selected{background:rgb(255 0 204 / .2)!important}.CodeMirror-gutters{background:rgb(0 0 0 / .3);border-right:1px solid var(--border-light)}.CodeMirror-linenumber{color:#00ffcc88!important}.editor-controls{display:flex;gap:15px;margin-top:20px}.editor button{flex:1;padding:14px;font-size:1rem;font-weight:700;border:none;border-radius:15px;color:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:12px;background:linear-gradient(45deg,var(--secondary),var(--accent));box-shadow:0 5px 20px rgb(0 0 0 / .7);min-height:50px}.editor button:hover{transform:scale(1.08);box-shadow:var(--neon-glow-accent),0 8px 35px rgb(0 0 0 / .8)}.preview-body{flex:1;position:relative;overflow:hidden;background:#fff;border-radius:15px;box-shadow:0 6px 30px var(--shadow-strength);padding:15px}#outputArea,#outputFrame{width:100%;height:100%;border:none;background:#fff;color:#222;font-family:'Fira Code',monospace;font-size:15px;white-space:pre-wrap;word-wrap:break-word;overflow:auto}.loader{display:none;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:60px;height:60px;border:6px solid;border-left-color:var(--primary);border-radius:50%;animation:.5s linear infinite spin}@keyframes spin{to{transform:translate(-50%,-50%) rotate(360deg)}}.error-message{display:none;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);background:linear-gradient(45deg,#f33,#c0c);color:#fff;padding:20px 35px;border-radius:15px;font-weight:700;box-shadow:0 0 40px rgb(0 0 0 / .9);z-index:200}.footer{padding:.8rem 1.5rem;display:flex;justify-content:space-between;align-items:center;gap:1.5rem;border-radius:30px 30px 0 0;flex-wrap:wrap}#pageInfo{font-family:Orbitron,sans-serif;color:#fff;font-weight:700;font-size:1.1rem;min-width:120px;text-align:center}.progress-bar{position:absolute;bottom:0;left:0;height:8px;background:linear-gradient(90deg,var(--primary),var(--accent));border-radius:0 0 0 30px;box-shadow:var(--neon-glow-primary);width:0}.footer button{padding:12px 20px;font-size:.95rem;font-weight:700;border:none;border-radius:15px;color:#fff;cursor:pointer;display:inline-flex;align-items:center;gap:10px;background:linear-gradient(45deg,var(--secondary),var(--accent));box-shadow:0 5px 20px rgb(0 0 0 / .7);flex:1;max-width:140px}.footer button:hover:not(:disabled){transform:scale(1.08);box-shadow:var(--neon-glow-accent),0 8px 35px rgb(0 0 0 / .8)}.footer button:disabled{background:rgb(15 15 30 / .7);color:rgb(255 255 255 / .3);cursor:not-allowed}::-webkit-scrollbar{width:10px}::-webkit-scrollbar-track{background:var(--glass-dark-base)}::-webkit-scrollbar-thumb{background:linear-gradient(var(--primary),var(--accent));border-radius:8px;border:3px solid}[data-tooltip]::before{content:attr(data-tooltip);position:absolute;top:-65px;left:50%;transform:translateX(-50%) scale(.5);background:linear-gradient(135deg,rgb(5 9 20 / .95),rgb(10 20 40 / .98));color:var(--primary-light);padding:12px 20px;border-radius:15px;font-size:14px;opacity:0;transition:.3s;z-index:20;border:1px solid var(--primary-dark);pointer-events:none;white-space:nowrap}[data-tooltip]:hover::before{opacity:1;transform:translateX(-50%) scale(1)}@media (max-width:768px){.top-header{display:none}.main{flex-direction:row;padding:.8rem;gap:.8rem;overflow-x:auto;scroll-snap-type:x mandatory}.editor,.preview,.sidebar{min-width:85vw;width:85vw;flex:0 0 85vw;height:auto;padding:20px;border-radius:30px;box-shadow:0 15px 50px var(--shadow-strength),var(--neon-glow-primary);scroll-snap-align:center;animation-delay:0s!important}.sidebar{background:linear-gradient(135deg,rgb(5 9 20 / .9),rgb(10 20 40 / .8))}#lessonTitle{font-size:2.2rem;text-align:center}.editor h3,.preview-title{font-size:1.6rem;text-align:center}.editor-controls{gap:12px}.editor button{padding:12px;font-size:.95rem}.footer{padding:1rem;flex-direction:row;justify-content:center;gap:1rem}#pageInfo{display:none}.footer button{padding:12px 18px;font-size:.95rem;flex:none;min-width:120px}.footer button:last-child{background:linear-gradient(45deg,var(--primary),var(--accent));font-size:1.1rem;padding:14px 24px}}@media (max-width:480px){.main{padding:.5rem;gap:.5rem}.editor,.preview,.sidebar{min-width:92vw;width:92vw;flex:0 0 92vw;padding:15px}#lessonTitle{font-size:1.9rem}.editor h3,.preview-title{font-size:1.4rem}#codeEditor,#editorArea,.CodeMirror{font-size:14px;padding:15px}.footer button{padding:10px 14px;font-size:.9rem}}