:root[data-theme=light]{--bg-primary: #f8fafc;--bg-secondary: #ffffff;--bg-tertiary: #f9fafb;--bg-gradient-start: #5eead4;--bg-gradient-end: #3b82f6;--text-primary: #1f2937;--text-secondary: #6b7280;--text-tertiary: #374151;--text-white: #ffffff;--border-primary: #e5e7eb;--border-secondary: #f3f4f6;--border-hover: #3b82f6;--card-bg: #ffffff;--card-shadow: rgba(0, 0, 0, .05);--card-shadow-hover: rgba(0, 0, 0, .1);--btn-primary-bg: #0ea5e9;--btn-primary-hover: #0284c7;--btn-secondary-bg: #ffffff;--overlay-bg: rgba(255, 255, 255, .1);--backdrop-blur: blur(10px);--welcome-circle-bg: rgba(255, 255, 255, .15);--welcome-badge-bg: rgba(255, 255, 255, .25)}:root[data-theme=dark]{--bg-primary: #0a0118;--bg-secondary: #1a0b2e;--bg-tertiary: #2d1b4e;--bg-gradient-start: #6366f1;--bg-gradient-end: #a855f7;--text-primary: #f0f0ff;--text-secondary: #c4b5fd;--text-tertiary: #e0d4ff;--text-white: #ffffff;--border-primary: #3730a3;--border-secondary: #4c1d95;--border-hover: #8b5cf6;--card-bg: #1a0b2e;--card-shadow: rgba(99, 102, 241, .15);--card-shadow-hover: rgba(168, 85, 247, .25);--btn-primary-bg: #8b5cf6;--btn-primary-hover: #7c3aed;--btn-secondary-bg: #2d1b4e;--overlay-bg: rgba(139, 92, 246, .1);--backdrop-blur: blur(10px);--welcome-circle-bg: rgba(99, 102, 241, .15);--welcome-badge-bg: rgba(139, 92, 246, .2);--accent-purple: #a855f7;--accent-indigo: #6366f1;--accent-cyan: #06b6d4}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;overflow-x:hidden;background:var(--bg-primary);transition:background-color .3s ease}.app-container{max-width:100%;width:100%;margin:0 auto;min-height:100vh}.welcome-page{min-height:100vh;background:linear-gradient(135deg,var(--bg-gradient-start) 0%,var(--bg-gradient-end) 100%);position:relative;overflow:hidden;display:flex;align-items:center;justify-content:center;padding:2rem;width:100%;transition:background .3s ease}[data-theme=dark] .welcome-page:after{content:"";position:absolute;top:0;left:0;right:0;bottom:0;background-image:radial-gradient(circle at 20% 30%,rgba(168,85,247,.15) 0%,transparent 50%),radial-gradient(circle at 80% 70%,rgba(99,102,241,.15) 0%,transparent 50%),radial-gradient(circle at 40% 80%,rgba(6,182,212,.1) 0%,transparent 50%);pointer-events:none}.welcome-page:before{content:"";position:absolute;top:50%;right:5%;transform:translateY(-50%);width:700px;height:700px;background:var(--overlay-bg);border-radius:50%;z-index:0}.welcome-container{position:relative;z-index:10;max-width:1200px;width:100%;display:grid;grid-template-columns:1fr 1fr;gap:4rem;align-items:center}.welcome-left{display:flex;flex-direction:column;gap:2rem}.welcome-title{font-size:4.5rem;font-weight:900;color:var(--text-white);line-height:1.1;text-shadow:0 4px 20px rgba(0,0,0,.1);margin-top:2.5rem}[data-theme=dark] .title-gradient{background:linear-gradient(90deg,#fff,#e0d4ff,#c4b5fd);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;text-shadow:0 0 40px rgba(168,85,247,.3)}.title-gradient{background:linear-gradient(90deg,#fff,#e0f2fe);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.welcome-subtitle{font-size:1.25rem;color:#fffffff2;line-height:1.6;font-family:Georgia,Times New Roman,serif;font-style:italic;font-weight:400}.features-grid{display:grid;grid-template-columns:1fr 1fr;gap:1rem;margin-top:1rem}.feature-box{display:flex;align-items:center;gap:.75rem;color:var(--text-white);font-weight:500;font-size:.95rem;padding:.75rem 1rem;background:#ffffff26;-webkit-backdrop-filter:var(--backdrop-blur);backdrop-filter:var(--backdrop-blur);border-radius:12px;border:1px solid rgba(255,255,255,.3);transition:all .3s ease}[data-theme=dark] .feature-box:hover{background:#8b5cf640;border-color:#a855f780;box-shadow:0 8px 16px #a855f733;transform:translateY(-2px)}.feature-box:hover{background:#ffffff26;transform:translateY(-2px)}.feature-icon{width:40px;height:40px;background:#fff3;-webkit-backdrop-filter:var(--backdrop-blur);backdrop-filter:var(--backdrop-blur);border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:1.25rem;flex-shrink:0}.btn-continuer{background:linear-gradient(135deg,#fff,#f0f0ff);color:#5b21b6;padding:1.25rem 3rem;border-radius:12px;font-weight:800;font-size:1.125rem;border:none;cursor:pointer;box-shadow:0 10px 30px #0003;transition:all .3s ease;align-self:center;-webkit-tap-highlight-color:transparent;touch-action:manipulation}[data-theme=dark] .btn-continuer{box-shadow:0 10px 30px #8b5cf666}[data-theme=dark] .btn-continuer:hover{transform:translateY(-3px);box-shadow:0 15px 40px #a855f780;background:var(--btn-primary-hover)}.btn-continuer:hover{transform:translateY(-3px);box-shadow:0 15px 40px #0000004d;background:var(--btn-primary-hover)}.welcome-right{position:relative;display:flex;align-items:center;justify-content:center}.character-circle{position:relative;width:550px;height:550px;background:#5e72e459;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border-radius:50%;border:3px solid rgba(59,130,246,.5);display:flex;align-items:center;justify-content:center;animation:float 6s ease-in-out infinite;box-shadow:0 15px 50px #3b82f64d,inset 0 0 80px #3b82f626}[data-theme=dark] .character-circle{background:#6366f126;border:2px solid rgba(168,85,247,.3);box-shadow:0 0 60px #a855f733,inset 0 0 60px #6366f11a}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-20px)}}.character-img{width:400px;height:auto;filter:drop-shadow(0 20px 40px rgba(0,0,0,.3));position:relative;z-index:2}[data-theme=dark] .character-img{filter:drop-shadow(0 20px 60px rgba(139,92,246,.4))}.floating-badge{position:absolute;background:#ffffff4d;-webkit-backdrop-filter:var(--backdrop-blur);backdrop-filter:var(--backdrop-blur);border:2px solid rgba(255,255,255,.5);border-radius:15px;padding:.875rem 1.5rem;color:var(--text-white);font-weight:600;font-size:.875rem;box-shadow:0 8px 20px #00000026;white-space:nowrap}[data-theme=dark] .floating-badge{background:#8b5cf633;border:2px solid rgba(168,85,247,.4);box-shadow:0 8px 24px #8b5cf64d}.badge-1{top:15%;left:-5%;animation:float-1 5s ease-in-out infinite}.badge-2{top:20%;right:-8%;animation:float-2 6s ease-in-out infinite}.badge-3{bottom:15%;right:-8%;animation:float-3 7s ease-in-out infinite}@keyframes float-1{0%,to{transform:translateY(0) rotate(-2deg)}50%{transform:translateY(-15px) rotate(2deg)}}@keyframes float-2{0%,to{transform:translateY(0) rotate(2deg)}50%{transform:translateY(-20px) rotate(-2deg)}}@keyframes float-3{0%,to{transform:translateY(0) rotate(-3deg)}50%{transform:translateY(-18px) rotate(3deg)}}.app-header{background:linear-gradient(135deg,var(--bg-gradient-start) 0%,var(--bg-gradient-end) 100%);padding:1.5rem 2rem;box-shadow:0 4px 20px #0000001a;position:sticky;top:0;z-index:100;width:100%;transition:background .3s ease}[data-theme=dark] .app-header{box-shadow:0 4px 20px #8b5cf64d,0 0 40px #6366f11a}.header-content{max-width:100%;width:100%;margin:0 auto;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:1rem}.header-right{display:flex;align-items:center;gap:1rem}.logo{font-size:1.5rem;font-weight:900;color:var(--text-white);display:flex;align-items:center;gap:.5rem}.logo-icon{font-size:2rem}.nav-breadcrumb{display:none!important}.home-button{background:#fff3;border:2px solid rgba(255,255,255,.3);color:var(--text-white);padding:.75rem 1.5rem;border-radius:12px;display:inline-flex;align-items:center;gap:.5rem;cursor:pointer;font-weight:600;font-size:.95rem;transition:all .3s ease;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);-webkit-tap-highlight-color:transparent;touch-action:manipulation}[data-theme=dark] .home-button{background:#ffffff26;border:2px solid rgba(255,255,255,.25)}[data-theme=dark] .home-button:hover{background:#ffffff40;border-color:#fff6;transform:scale(1.05)}.home-button:hover{background:#ffffff4d;border-color:#ffffff80;transform:scale(1.05)}.home-button:active{transform:scale(.95)}.theme-toggle{background:#fff3;border:1px solid rgba(255,255,255,.3);color:var(--text-white);width:44px;height:44px;border-radius:12px;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all .3s ease;-webkit-backdrop-filter:var(--backdrop-blur);backdrop-filter:var(--backdrop-blur);flex-shrink:0}[data-theme=dark] .theme-toggle{border:1px solid rgba(168,85,247,.4);box-shadow:0 4px 12px #8b5cf64d}[data-theme=dark] .theme-toggle:hover{background:#a855f74d;border-color:#a855f799;box-shadow:0 6px 16px #a855f780;transform:scale(1.05)}.theme-toggle:hover{background:#ffffff4d;transform:scale(1.05)}.theme-toggle:active{transform:scale(.95)}.page-container{min-height:100vh;background:var(--bg-primary);padding:2rem;width:100%;max-width:100%;transition:background-color .3s ease}.page-content{max-width:1400px;margin:0 auto;width:100%}.page-header{margin-bottom:2.5rem}.back-button{background:linear-gradient(135deg,#3b82f6,#2563eb);border:none;color:#fff;padding:.875rem 1.75rem;border-radius:50px;display:inline-flex;align-items:center;gap:.625rem;cursor:pointer;font-weight:700;font-size:.95rem;transition:all .3s cubic-bezier(.4,0,.2,1);box-shadow:0 4px 12px #3b82f64d;position:fixed;top:8.5rem;right:3rem;z-index:1000;overflow:hidden;-webkit-tap-highlight-color:transparent;touch-action:manipulation}.back-button:before{content:"";position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,.3),transparent);transition:left .5s ease}.back-button:hover:before{left:100%}.back-button svg{transition:transform .3s ease}.back-button:hover svg{transform:translate(-5px)}[data-theme=dark] .back-button{background:#ffffff26;border:2px solid rgba(255,255,255,.25);box-shadow:0 4px 12px #0003}[data-theme=dark] .back-button:hover{background:#ffffff40;border-color:#fff6;transform:scale(1.05);box-shadow:0 6px 16px #0000004d}.back-button:hover{background:#ffffff4d;border-color:#ffffff80;transform:scale(1.05);box-shadow:0 6px 16px #00000026}.back-button:active{transform:scale(.95);box-shadow:0 2px 8px #0003}.page-header-with-back{display:block;margin-bottom:2.5rem}.page-header-with-back .page-header{margin-bottom:0}.page-title{font-size:2.75rem;font-weight:900;color:var(--text-primary);margin-bottom:.75rem;transition:color .3s ease}[data-theme=dark] .page-title{background:linear-gradient(135deg,#f0f0ff,#c4b5fd);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;text-shadow:0 0 40px rgba(168,85,247,.3)}.page-subtitle{font-size:1.25rem;color:var(--text-secondary);font-weight:500;transition:color .3s ease}.grid-container{display:grid;gap:1.5rem;width:100%}.grid-2{grid-template-columns:repeat(auto-fill,minmax(min(100%,350px),1fr))}.grid-3{grid-template-columns:repeat(auto-fill,minmax(min(100%,300px),1fr))}.card{background:var(--card-bg);border-radius:16px;padding:1.75rem;box-shadow:0 4px 12px var(--card-shadow);border:2px solid transparent;cursor:pointer;transition:all .3s cubic-bezier(.4,0,.2,1);position:relative;overflow:hidden}.card:before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:linear-gradient(90deg,var(--bg-gradient-start) 0%,var(--bg-gradient-end) 100%);transform:scaleX(0);transition:transform .3s ease}[data-theme=dark] .card{border:2px solid rgba(99,102,241,.2)}[data-theme=dark] .card-hover:hover{transform:translateY(-8px);box-shadow:0 16px 32px #a855f74d;border-color:#8b5cf6}.card-hover:hover{transform:translateY(-8px);box-shadow:0 16px 32px var(--card-shadow-hover);border-color:var(--border-hover)}.card-hover:hover:before{transform:scaleX(1)}.card-header{display:flex;align-items:flex-start;gap:1.25rem;margin-bottom:.5rem}.card-icon{width:64px;height:64px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:2rem;flex-shrink:0;font-weight:700;box-shadow:0 4px 12px #0000001a}[data-theme=dark] .card-icon-green{background:linear-gradient(135deg,#065f46,#059669);color:#86efac;box-shadow:0 4px 12px #10b9814d}[data-theme=dark] .card-icon-blue{background:linear-gradient(135deg,#1e3a8a,#3b82f6);color:#93c5fd;box-shadow:0 4px 12px #3b82f64d}[data-theme=dark] .card-icon-orange{background:linear-gradient(135deg,#9a3412,#ea580c);color:#fdba74;box-shadow:0 4px 12px #ea580c4d}[data-theme=dark] .card-icon-purple{background:linear-gradient(135deg,#6b21a8,#a855f7);color:#e9d5ff;box-shadow:0 4px 12px #a855f766}[data-theme=dark] .card-icon-pink{background:linear-gradient(135deg,#9f1239,#ec4899);color:#fbcfe8;box-shadow:0 4px 12px #ec48994d}.card-icon-green{background:linear-gradient(135deg,#d1fae5,#86efac);color:#059669}.card-icon-blue{background:linear-gradient(135deg,#dbeafe,#93c5fd);color:#2563eb}.card-icon-orange{background:linear-gradient(135deg,#fed7aa,#fdba74);color:#ea580c}.card-icon-purple{background:linear-gradient(135deg,#f3e8ff,#d8b4fe);color:#9333ea}.card-icon-pink{background:linear-gradient(135deg,#fce7f3,#f9a8d4);color:#db2777}.card-content{flex:1}.card-title{font-size:1.375rem;font-weight:700;color:var(--text-primary);margin-bottom:.5rem;line-height:1.3;transition:color .3s ease}.card-description{font-size:.95rem;color:var(--text-secondary);line-height:1.6;transition:color .3s ease}.card-badge{display:inline-block;background:linear-gradient(135deg,var(--bg-tertiary) 0%,var(--border-secondary) 100%);color:var(--text-tertiary);padding:.375rem .875rem;border-radius:50px;font-size:.8rem;font-weight:600;margin-top:.75rem;transition:all .3s ease}[data-theme=dark] .card-badge{background:linear-gradient(135deg,#8b5cf633,#a855f726);color:#c4b5fd;border:1px solid rgba(139,92,246,.3)}.card-arrow{position:absolute;right:1.75rem;top:50%;transform:translateY(-50%);font-size:1.5rem;color:#3b82f6;opacity:0;transition:all .3s ease}[data-theme=dark] .card-arrow{color:#a855f7}.card-hover:hover .card-arrow{opacity:1;transform:translateY(-50%) translate(5px)}.content-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,340px),1fr));gap:1.5rem;width:100%}.content-card{background:var(--card-bg);border-radius:16px;padding:1.5rem;box-shadow:0 4px 12px var(--card-shadow);border:2px solid var(--border-primary);transition:all .3s ease;display:flex;flex-direction:column;gap:1rem}[data-theme=dark] .content-card{border:2px solid rgba(99,102,241,.2)}[data-theme=dark] .content-card:hover{border-color:#8b5cf6;box-shadow:0 12px 28px #a855f740;transform:translateY(-4px)}.content-card:hover{border-color:var(--border-hover);box-shadow:0 12px 28px #3b82f626;transform:translateY(-4px)}.content-card-header{display:flex;gap:1rem;align-items:flex-start}.content-card-icon{width:48px;height:48px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:1.5rem;flex-shrink:0;box-shadow:0 4px 12px #0000001a}[data-theme=dark] .content-card-icon-green{background:linear-gradient(135deg,#065f46,#059669);box-shadow:0 4px 12px #10b9814d}[data-theme=dark] .content-card-icon-blue{background:linear-gradient(135deg,#1e3a8a,#3b82f6);box-shadow:0 4px 12px #3b82f64d}[data-theme=dark] .content-card-icon-orange{background:linear-gradient(135deg,#9a3412,#ea580c);box-shadow:0 4px 12px #ea580c4d}[data-theme=dark] .content-card-icon-purple{background:linear-gradient(135deg,#6b21a8,#a855f7);box-shadow:0 4px 12px #a855f766}[data-theme=dark] .content-card-icon-pink{background:linear-gradient(135deg,#9f1239,#ec4899);box-shadow:0 4px 12px #ec48994d}.content-card-icon-green{background:linear-gradient(135deg,#d1fae5,#86efac)}.content-card-icon-blue{background:linear-gradient(135deg,#dbeafe,#93c5fd)}.content-card-icon-orange{background:linear-gradient(135deg,#fed7aa,#fdba74)}.content-card-icon-purple{background:linear-gradient(135deg,#f3e8ff,#d8b4fe)}.content-card-icon-pink{background:linear-gradient(135deg,#fce7f3,#f9a8d4)}.content-card-body{flex:1;min-width:0}.content-card-title{font-size:1.0625rem;font-weight:700;color:var(--text-primary);margin-bottom:.5rem;line-height:1.4;word-wrap:break-word;transition:color .3s ease}.content-card-description{font-size:.875rem;color:var(--text-secondary);line-height:1.5;margin-bottom:.75rem;word-wrap:break-word;transition:color .3s ease}.content-card-badge{display:inline-flex;align-items:center;gap:.375rem;background:linear-gradient(135deg,#dbeafe,#bfdbfe);color:#1e40af;padding:.375rem .75rem;border-radius:50px;font-size:.75rem;font-weight:600}[data-theme=dark] .content-card-badge{background:linear-gradient(135deg,#6366f14d,#8b5cf633);color:#c4b5fd;border:1px solid rgba(139,92,246,.3)}.content-card-actions{display:flex;gap:.75rem;padding-top:.75rem;border-top:1px solid var(--border-secondary)}.btn-view{background:#1e40af;color:var(--text-white);padding:.75rem 1.25rem;border-radius:10px;font-weight:700;font-size:.875rem;border:none;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;gap:.5rem;transition:all .3s ease;box-shadow:0 2px 8px #8b5cf640;flex:1;text-decoration:none;white-space:nowrap;min-height:44px}[data-theme=dark] .btn-view{background:linear-gradient(135deg,#6b21a8,#7c3aed);box-shadow:0 4px 12px #7c3aed66}[data-theme=dark] .btn-view:hover{background:linear-gradient(135deg,#7c3aed,#8b5cf6);transform:translateY(-2px);box-shadow:0 6px 16px #8b5cf680}.btn-view:hover{background:#1e3a8a;transform:translateY(-2px);box-shadow:0 6px 16px #8b5cf659}.btn-download-small{background:#3b82f6;color:var(--text-white);padding:.75rem 1.25rem;border-radius:10px;font-weight:700;font-size:.875rem;border:none;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;gap:.5rem;transition:all .3s ease;text-decoration:none;box-shadow:0 2px 8px #3b82f640;flex:1;white-space:nowrap;min-height:44px}[data-theme=dark] .btn-download-small{background:linear-gradient(135deg,#0891b2,#06b6d4);box-shadow:0 4px 12px #06b6d466}[data-theme=dark] .btn-download-small:hover{background:linear-gradient(135deg,#06b6d4,#22d3ee);transform:translateY(-2px);box-shadow:0 6px 16px #22d3ee80}.btn-download-small:hover{background:#2563eb;transform:translateY(-2px);box-shadow:0 6px 16px #3b82f659}.btn-secondary{background:var(--btn-secondary-bg);color:var(--text-tertiary);padding:1.125rem 2.25rem;border-radius:12px;font-weight:700;font-size:1.0625rem;border:2px solid var(--border-primary);cursor:pointer;display:inline-flex;align-items:center;gap:.75rem;transition:all .3s ease}[data-theme=dark] .btn-secondary:hover{border-color:#8b5cf6;color:#c4b5fd;background:var(--bg-tertiary);box-shadow:0 4px 12px #8b5cf64d}.btn-secondary:hover{border-color:var(--border-hover);color:#3b82f6;background:var(--bg-tertiary)}.button-group{display:flex;gap:1rem;margin-top:2rem;flex-wrap:wrap}.loading-container{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:5rem 2rem;text-align:center}.loading-spinner{margin-bottom:1.5rem}.spinner{width:60px;height:60px;border:4px solid var(--border-primary);border-top:4px solid #3b82f6;border-radius:50%;animation:spin 1s linear infinite}[data-theme=dark] .spinner{border:4px solid rgba(99,102,241,.2);border-top:4px solid #a855f7}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.loading-text{color:var(--text-secondary);font-size:1.125rem;font-weight:500;transition:color .3s ease}.empty-state{text-align:center;padding:5rem 2rem;color:var(--text-secondary);background:var(--card-bg);border-radius:16px;border:2px dashed var(--border-primary);transition:all .3s ease}.empty-icon{font-size:5rem;margin-bottom:1.5rem;opacity:.4}.empty-title{font-size:1.75rem;font-weight:700;color:var(--text-tertiary);margin-bottom:.75rem;transition:color .3s ease}.empty-description{font-size:1.0625rem;color:var(--text-secondary);transition:color .3s ease}.course-detail{background:var(--card-bg);border-radius:16px;padding:2rem;box-shadow:0 4px 12px var(--card-shadow);transition:all .3s ease}[data-theme=dark] .course-detail{border:2px solid rgba(99,102,241,.2)}.course-header{margin-bottom:2rem;border-bottom:2px solid var(--border-secondary);padding-bottom:1.5rem}.course-title{font-size:2rem;font-weight:800;color:var(--text-primary);margin-bottom:1rem;transition:color .3s ease}.course-meta{display:flex;gap:1.5rem;flex-wrap:wrap;margin-bottom:1rem}.course-meta-item{display:flex;align-items:center;gap:.5rem;color:var(--text-secondary);font-size:.95rem;transition:color .3s ease}.course-description-text{color:var(--text-secondary);line-height:1.6;transition:color .3s ease}.course-body{margin-bottom:2rem}.video-container{position:relative;width:100%;padding-bottom:56.25%;margin-bottom:2rem}.video-wrapper{position:absolute;top:0;left:0;width:100%;height:100%;border-radius:12px;overflow:hidden}.video-wrapper iframe{width:100%;height:100%}.html-content{color:var(--text-primary);line-height:1.8;transition:color .3s ease}.course-placeholder{text-align:center;padding:3rem 2rem;background:var(--bg-tertiary);border-radius:12px;transition:background-color .3s ease}.course-placeholder-icon{font-size:4rem;margin-bottom:1rem;opacity:.5}.course-placeholder h2{font-size:1.5rem;color:var(--text-primary);margin-bottom:.75rem;transition:color .3s ease}.course-placeholder 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