:root{--bg-dark: #0a0e17;--bg-card: rgba(20, 25, 35, .7);--neon-cyan: #00f0ff;--neon-purple: #bd00ff;--pastel-mint: #b9fbc0;--pastel-pink: #ffcbf2;--pastel-blue: #a0c4ff;--pastel-yellow: #fde4cf;--text-main: #ffffff;--text-muted: #9ca3af;--text-dark: #0a0e17;--glass-border: rgba(255, 255, 255, .1);--glass-highlight: rgba(255, 255, 255, .05);--radius-lg: 24px;--radius-md: 16px;--radius-sm: 8px;--font-main: "Outfit", sans-serif;--touch-target-min: 44px}*{box-sizing:border-box}body{margin:0;background-color:var(--bg-dark);color:var(--text-main);font-family:var(--font-main);min-height:100vh;overflow-x:hidden;line-height:1.6;background-image:radial-gradient(circle at 15% 50%,rgba(0,240,255,.08),transparent 25%),radial-gradient(circle at 85% 30%,rgba(189,0,255,.08),transparent 25%)}#app{max-width:1200px;margin:0 auto;padding:2rem;min-height:100vh;display:flex;flex-direction:column}@media(max-width:768px){#app{padding:1rem}}.btn-primary{background:var(--neon-cyan);color:var(--bg-dark);border:none;padding:1rem 2rem;min-height:var(--touch-target-min);font-family:var(--font-main);font-weight:700;font-size:1.1rem;border-radius:var(--radius-md);cursor:pointer;transition:all .3s ease;box-shadow:0 0 15px #00f0ff4d;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:.5rem;-webkit-tap-highlight-color:transparent;user-select:none;-webkit-user-select:none}.btn-primary:hover{background:#fff;box-shadow:0 0 25px #00f0ff99;transform:translateY(-2px)}.btn-primary:active{transform:translateY(0);opacity:.8}@media(max-width:768px){.btn-primary{font-size:1rem;padding:.9rem 1.5rem}}.glass-panel{background:var(--bg-card);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1px solid var(--glass-border);border-radius:var(--radius-lg);box-shadow:0 8px 32px #0003}.text-gradient{background:linear-gradient(135deg,var(--neon-cyan),var(--pastel-blue));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}@media(hover:none)and (pointer:coarse){.btn-primary:hover{background:var(--neon-cyan);box-shadow:0 0 15px #00f0ff4d;transform:none}}html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes fadeOut{0%{opacity:1}to{opacity:0}}@keyframes slideUp{0%{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}@keyframes slideIn{0%{opacity:0;transform:translate(30px)}to{opacity:1;transform:translate(0)}}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-10px)}}@supports (padding: max(0px)){body{padding-left:max(0px,env(safe-area-inset-left));padding-right:max(0px,env(safe-area-inset-right))}}input,textarea,select{font-size:16px}@media(max-width:768px){input,textarea,select{font-size:16px}}.course-library{width:100%;animation:fadeIn .4s ease}.library-header{margin-bottom:3rem}.header-content{margin-bottom:2rem}.library-title{font-size:3rem;font-weight:800;margin:0 0 .5rem;background:linear-gradient(135deg,var(--neon-cyan),var(--pastel-blue));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.library-subtitle{font-size:1.25rem;color:var(--text-muted);margin:0;line-height:1.5}.library-controls{display:flex;flex-direction:column;gap:1.5rem}.search-box{position:relative;max-width:500px}.search-icon{position:absolute;left:1rem;top:50%;transform:translateY(-50%);color:var(--text-muted);pointer-events:none}.search-input{width:100%;padding:1rem 1rem 1rem 3rem;background:var(--bg-card);border:2px solid var(--glass-border);border-radius:var(--radius-md);color:var(--text-main);font-family:var(--font-main);font-size:1rem;transition:all .3s ease;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.search-input:focus{outline:none;border-color:var(--neon-cyan);box-shadow:0 0 20px #00f0ff33}.search-input::placeholder{color:var(--text-muted)}.filter-tabs{display:flex;gap:1rem;flex-wrap:wrap}.filter-tab{padding:.75rem 1.5rem;background:var(--bg-card);border:2px solid var(--glass-border);border-radius:var(--radius-md);color:var(--text-muted);font-family:var(--font-main);font-size:.95rem;font-weight:600;cursor:pointer;transition:all .3s ease;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.filter-tab:hover{border-color:var(--neon-cyan);color:var(--text-main)}.filter-tab.active{background:var(--neon-cyan);border-color:var(--neon-cyan);color:var(--bg-dark);box-shadow:0 0 15px #00f0ff4d}.courses-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:2rem;margin-top:2rem}.course-card{background:var(--bg-card);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border:2px solid var(--glass-border);border-radius:var(--radius-lg);padding:2rem;cursor:pointer;transition:all .3s ease;display:flex;flex-direction:column;gap:1rem;animation:slideUp .4s ease}.course-card:hover{border-color:var(--neon-cyan);transform:translateY(-8px);box-shadow:0 12px 40px #00f0ff33}.course-card-header{display:flex;justify-content:space-between;align-items:flex-start}.course-icon{font-size:2.5rem;line-height:1}.course-difficulty{padding:.5rem 1rem;border-radius:var(--radius-sm);font-size:.75rem;font-weight:700;text-transform:uppercase;letter-spacing:.5px}.course-title{font-size:1.5rem;font-weight:700;margin:0;color:var(--text-main);line-height:1.3}.course-description{color:var(--text-muted);margin:0;line-height:1.6;flex-grow:1}.course-meta{display:flex;gap:1.5rem;padding-top:1rem;border-top:1px solid var(--glass-border)}.meta-item{display:flex;align-items:center;gap:.5rem;color:var(--text-muted);font-size:.9rem}.meta-item svg{color:var(--neon-cyan)}.course-start-button{width:100%;padding:1rem;background:var(--neon-cyan);color:var(--bg-dark);border:none;border-radius:var(--radius-md);font-family:var(--font-main);font-weight:700;font-size:1rem;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:.5rem;transition:all .3s ease}.course-start-button:hover{background:#fff;box-shadow:0 0 20px #00f0ff66}.loading-spinner{grid-column:1 / -1;text-align:center;padding:4rem 2rem;color:var(--text-muted);font-size:1.1rem}.error-message,.empty-state{grid-column:1 / -1;text-align:center;padding:4rem 2rem;display:flex;flex-direction:column;align-items:center;gap:1rem}.error-message svg,.empty-state svg{color:var(--neon-cyan);opacity:.5}.error-message h3,.empty-state h3{font-size:1.5rem;margin:0;color:var(--text-main)}.error-message p,.empty-state p{color:var(--text-muted);margin:0;max-width:400px}.retry-button{margin-top:1rem;padding:.75rem 1.5rem;background:var(--neon-cyan);color:var(--bg-dark);border:none;border-radius:var(--radius-md);font-family:var(--font-main);font-weight:600;cursor:pointer;transition:all .3s ease}.retry-button:hover{background:#fff;box-shadow:0 0 15px #00f0ff4d}@media(max-width:768px){.library-title{font-size:2rem}.library-subtitle{font-size:1rem}.courses-grid{grid-template-columns:1fr;gap:1.5rem}.filter-tabs{gap:.5rem}.filter-tab{font-size:.85rem;padding:.6rem 1rem}.course-card{padding:1.5rem}.course-title{font-size:1.25rem}}@media(max-width:480px){.search-box{max-width:100%}.filter-tabs{display:grid;grid-template-columns:repeat(2,1fr)}.filter-tab{text-align:center}}@media(min-width:768px)and (max-width:1024px){#app{max-width:100%;padding:1.5rem}.lesson-view{font-size:.95rem}.glass-panel{padding:1.25rem}.lesson-view button{font-size:.85rem;padding:.4rem .8rem}.course-outline-view>div[style*=grid-template-columns]{grid-template-columns:1fr!important}}@media(max-width:768px){.lesson-view{height:auto!important;min-height:100vh}.lesson-view>div[style*="justify-content: space-between"]{flex-direction:column;align-items:stretch!important;gap:1rem}.lesson-view>div[style*="justify-content: space-between"]>div:last-child{width:100%;justify-content:center}.lesson-view>div[style*="justify-content: space-between"]>div:nth-child(2){order:-1;text-align:center}.lesson-view button{min-width:auto;flex:1}.glass-panel[style*=max-height],.steps-container{max-height:none!important}#lesson-content-wrapper{flex-direction:column!important;gap:1rem!important}#scratch-workspace{min-height:400px!important;padding:1.5rem!important}#scratch-workspace h3{font-size:1.3rem!important}#scratch-workspace p{font-size:.9rem!important}#scratch-workspace>div[style*=grid-template-columns]{grid-template-columns:1fr!important;gap:.75rem!important;margin-top:1.5rem!important}.course-outline-view h1{font-size:2rem!important}.course-outline-view p[style*="font-size: 1.2rem"]{font-size:1rem!important}.course-outline-view>div[style*="justify-content: center"]{flex-direction:column!important;align-items:stretch!important}button[id=back-btn]{position:relative!important;top:auto!important;left:auto!important;margin-bottom:1rem}.course-outline-view button[id=share-btn]{width:100%}}@media(max-width:480px){#app{padding:.75rem}.btn-primary{font-size:1rem;padding:.75rem 1.5rem}.btn-secondary{font-size:.85rem;padding:.5rem .75rem}.lesson-view h1,.course-outline-view h1{font-size:1.5rem!important}.step-item h4{font-size:1rem!important}.lesson-view>div[style*="gap: 0.5rem"]{gap:.5rem!important}#scratch-workspace>div[style*="font-size: 5rem"]{font-size:3rem!important}#scratch-workspace>div[style*="background: rgba(185, 251, 192, 0.08)"]{padding:.75rem!important;margin:0 auto 1.5rem!important}}@media(max-width:896px)and (orientation:landscape){#app{padding:1rem 2rem}.lesson-view{height:auto!important}.glass-panel[style*="overflow-y: auto"]{max-height:60vh!important}#scratch-workspace{min-height:250px!important;padding:1rem!important}#scratch-workspace>div[style*="font-size: 5rem"]{font-size:3rem!important;margin-bottom:1rem!important}}@media print{body{background:#fff;color:#000}#app{max-width:100%;padding:0}.glass-panel{background:#fff;border:1px solid #ccc;box-shadow:none}button,.btn-primary,.btn-secondary,#scratch-workspace{display:none!important}.steps-container{page-break-inside:avoid}.step-item{page-break-inside:avoid;border-left:3px solid #000;padding-left:1rem;margin-bottom:1rem}}@keyframes slideUp{0%{transform:translate(-50%,100px);opacity:0}to{transform:translate(-50%);opacity:1}}