:root{--primary:#00ffcc;--primary-light:#66fff5;--primary-dark:#008080;--secondary:#00b7ff;--accent:#ff00cc;--background-dark:#050914;--glass-base:rgba(255, 255, 255, 0.05);--glass-dark-base:rgba(5, 9, 20, 0.85);--border-light:rgba(255, 255, 255, 0.2);--shadow-strength:rgba(0, 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, 0.3);--neon-glow-accent:0 0 12px var(--accent),0 0 30px rgba(255, 0, 204, 0.7);--text-main:#e0f0ff;--text-highlight:#ffffff;--code-bg:rgba(10, 15, 30, 0.9);--code-border:var(--primary-dark);--metallic-sheen:linear-gradient(45deg, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0.3), rgba(255, 255, 255, 0.1))}*{margin:0;padding:0;box-sizing:border-box;transition:.3s cubic-bezier(.4, 0, .2, 1);scrollbar-color:var(--primary) transparent;scrollbar-width:thin}body{font-family:Rajdhani,'Segoe UI',sans-serif;height:100vh;overflow:hidden;display:flex;flex-direction:column;background:var(--background-dark);position:relative;color:var(--text-main)}body::before{content:'';position:absolute;top:0;left:0;width:100%;height:100%;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 fill-rule="evenodd" 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),var(--metallic-sheen);z-index:10;position:relative;animation:1s cubic-bezier(.22,1,.36,1) headerFooterEntry}@keyframes headerFooterEntry{from{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}.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 rgba(0,255,204,.6);border-radius:0 0 30px 30px;border-top:none;display:flex;align-items:center;justify-content:center;gap:15px;background:linear-gradient(145deg,var(--glass-dark-base),rgba(5,9,20,.9))}.top-header i{transition:transform .4s cubic-bezier(.68, -.55, .265, 1.55);color:var(--primary);filter:drop-shadow(0 0 5px var(--primary-light))}.top-header:hover i{transform:rotate(20deg) scale(1.3);filter:drop-shadow(0 0 10px var(--primary-light))}.main{flex:1;display:flex;overflow:hidden;padding:1.5rem;gap:1.5rem;position:relative;z-index:5}.editor,.preview,.sidebar{padding:25px;display:flex;flex-direction:column;overflow:hidden;border-radius:25px;border:1px solid var(--border-light);box-shadow:0 10px 40px var(--shadow-strength),var(--metallic-sheen);backdrop-filter:blur(35px) saturate(1.8);position:relative;transform:perspective(1000px) rotateX(0) rotateY(0);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;border:1px solid rgba(0,0,0,.1)}@keyframes panelSlideIn{from{opacity:0;transform:translateY(50px) scale(.9)}to{opacity:1;transform:translateY(0) scale(1)}}.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)}#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;-webkit-text-fill-color:transparent;text-shadow:0 0 10px rgba(0,255,204,.4);margin-bottom:20px;position:relative;transition:transform .3s}#lessonTitle:hover{transform:scale(1.05) translateY(-5px)}#lessonContent{flex:1;overflow-y:auto;line-height:1.8;font-size:1.1rem;font-weight:400;padding-right:15px;color:var(--text-main);min-height:250px}#lessonContent h2,#lessonContent h3{font-family:Orbitron,sans-serif;color:var(--primary-light);font-weight:800;margin-bottom:15px;text-shadow:0 0 6px rgba(0,255,204,.3)}#lessonContent ul{list-style:none;padding-left:0}#lessonContent li{padding-left:2.5em;position:relative;margin-bottom:.8em}#lessonContent li::before{content:'✦';color:var(--accent);position:absolute;left:.5em;font-size:1.3rem;filter:drop-shadow(0 0 6px var(--accent))}#lessonContent table{width:100%;border-collapse:collapse;background:var(--code-bg);border-radius:15px;margin:15px 0;box-shadow:inset 0 0 15px rgba(0,0,0,.6),0 6px 30px var(--shadow-strength)}#lessonContent td,#lessonContent th{padding:10px;border:1px solid var(--border-light);color:var(--text-main);font-family:'Fira Code',monospace;font-size:.95rem}#lessonContent th{background:var(--primary-dark);color:var(--text-highlight)}.editor h3,.preview-title{font-family:Orbitron,sans-serif;font-size:1.8rem;font-weight:900;margin-bottom:15px;text-shadow:0 0 10px var(--shadow-strength)}.editor h3{color:var(--secondary)}.preview-title{color:#222;text-align:center}.editor-area{flex:1;background:var(--code-bg);color:var(--text-main);font-family:'Fira Code',monospace;font-size:15px;padding:20px;margin-top:20px;white-space:pre-wrap;overflow-y:auto;border-radius:15px;border:1px solid var(--border-light);box-shadow:inset 0 0 15px rgba(0,0,0,.5),0 6px 30px var(--shadow-strength);resize:vertical;min-height:180px;line-height:1.5}.editor-area:focus{outline:0;border-color:var(--accent);box-shadow:inset 0 0 15px rgba(0,0,0,.6),var(--neon-glow-accent)}.preview-body{flex:1;overflow:auto;position:relative;min-height:180px}.preview-body pre{width:100%;height:100%;margin:0;padding:10px;border-radius:15px;background:#fff;color:#222;font-family:'Fira Code',monospace;font-size:15px;box-shadow:0 6px 30px var(--shadow-strength);overflow-x:auto;white-space:nowrap}.preview-body pre table{width:100%;border-collapse:collapse;background:#fff}.preview-body pre td,.preview-body pre th{padding:10px;border:1px solid #ccc;color:#222;font-family:'Fira Code',monospace;font-size:15px;text-align:left}.preview-body pre th{background:#f0f0f0;text-transform:uppercase}.preview-body pre:focus{outline:0;border:2px solid var(--primary);box-shadow:var(--neon-glow-primary)}.editor button,.footer button{position:relative;overflow:hidden;padding:12px 28px;font-size:1rem;font-weight:700;border:none;border-radius:15px;color:var(--text-highlight);cursor:pointer;display:inline-flex;align-items:center;justify-content:center;gap:12px;text-shadow:1px 1px 6px var(--shadow-strength);box-shadow:0 5px 20px rgba(0,0,0,.7);background:linear-gradient(45deg,var(--secondary),var(--accent));animation:.6s ease-out backwards buttonPopIn;animation-delay:var(--button-delay, 0s)}.editor button{margin-top:20px;margin-right:10px}.editor-controls{display:flex;justify-content:flex-start;gap:10px}.editor button:hover,.footer button:not(:disabled):hover{transform:scale(1.08);box-shadow:var(--neon-glow-accent),0 8px 35px rgba(0,0,0,.8)}.editor button:active,.footer button:active{transform:scale(.95) translateY(2px);box-shadow:inset 0 3px 12px rgba(0,0,0,.6)}.footer button{background:linear-gradient(45deg,#15203a,var(--background-dark));border:1px solid var(--border-light)}.footer button:disabled{background:rgba(15,15,30,.7);color:rgba(255,255,255,.3);cursor:not-allowed;box-shadow:inset 0 2px 6px rgba(0,0,0,.5)}button:focus-visible{outline:3px solid var(--primary-light);outline-offset:6px}.footer{padding:.8rem 1.5rem;display:flex;justify-content:space-between;align-items:center;gap:2rem;border-radius:30px 30px 0 0;border-bottom:none}#pageInfo{font-family:Orbitron,sans-serif;color:var(--text-highlight);font-weight:700;text-shadow:0 0 10px rgba(0,0,0,.8);font-size:1.1rem}.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),inset 0 0 10px rgba(255,255,255,.2);background-image:var(--metallic-sheen)}.loader{display:none;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:60px;height:60px;border:6px solid rgba(0,0,0,.3);border-left-color:var(--primary);border-radius:50%;animation:.5s linear infinite spin;z-index:100;box-shadow:0 0 15px var(--primary-light)}@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:var(--text-highlight);padding:20px 35px;border-radius:15px;font-weight:700;box-shadow:0 0 40px rgba(255,0,0,.9),0 0 15px rgba(255,255,255,.3) inset;border:1px solid rgba(255,255,255,.6);animation:.5s cubic-bezier(.22,1,.36,1) forwards fadeInPop;z-index:200}::-webkit-scrollbar{width:12px}::-webkit-scrollbar-track{background:var(--glass-dark-base);border-radius:10px}::-webkit-scrollbar-thumb{background:linear-gradient(180deg,var(--primary),var(--accent));border-radius:8px;border:3px solid rgba(0,0,0,.6);box-shadow:0 0 8px rgba(0,255,204,.4) inset}::-webkit-scrollbar-thumb:hover{background:linear-gradient(180deg,var(--primary-light),var(--accent))}[data-tooltip]{position:relative}[data-tooltip]::before{content:attr(data-tooltip);position:absolute;top:-65px;left:50%;transform:translateX(-50%) scale(.5);background:linear-gradient(135deg,rgba(5,9,20,.95),rgba(10,20,40,.98));color:var(--primary-light);padding:12px 20px;border-radius:15px;font-size:14px;font-weight:600;opacity:0;pointer-events:none;transition:opacity .3s cubic-bezier(.25, .8, .25, 1),transform .3s cubic-bezier(.25, .8, .25, 1);z-index:20;white-space:nowrap;border:1px solid var(--primary-dark);box-shadow:0 0 20px rgba(0,183,255,.5)}[data-tooltip]:focus::before,[data-tooltip]:hover::before{opacity:1;transform:translateX(-50%) scale(1)}@keyframes fadeInPop{from{opacity:0;transform:translate(-50%,-50%) scale(.6)}to{opacity:1;transform:translate(-50%,-50%) scale(1)}}#lessonContent h2,#lessonContent h3,#lessonContent p,#lessonContent table,#lessonContent ul{opacity:0;transform:translateY(20px);animation:.5s cubic-bezier(.22,1,.36,1) forwards contentFadeUp;animation-delay:var(--delay)}@keyframes contentFadeUp{to{opacity:1;transform:translateY(0)}}.main>div.active-lesson-highlight{border-color:var(--primary-light);box-shadow:0 0 50px var(--primary-light),0 0 30px var(--secondary)}@keyframes buttonPopIn{0%{opacity:0;transform:translateY(20px) scale(.85)}100%{opacity:1;transform:translateY(0) scale(1)}}@media (prefers-reduced-motion:reduce){*,::after,::before{animation-duration:10ms!important;animation-iteration-count:1!important;transition-duration:10ms!important}}@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}.editor-area{font-size:14px;padding:15px}.footer button{padding:10px 14px;font-size:.9rem}}