:root{--font-sans: "Plus Jakarta Sans", "Inter", -apple-system, BlinkMacSystemFont, sans-serif;--font-mono: "Fira Code", monospace;--bg-primary: #0b0f19;--bg-secondary: #111827;--bg-card: rgba(17, 24, 39, .75);--bg-card-hover: rgba(31, 41, 55, .85);--bg-glass: rgba(255, 255, 255, .03);--border-subtle: rgba(255, 255, 255, .08);--border-accent: rgba(99, 102, 241, .3);--primary: #6366f1;--primary-hover: #4f46e5;--primary-glow: rgba(99, 102, 241, .25);--secondary: #8b5cf6;--accent-cyan: #06b6d4;--success: #10b981;--success-bg: rgba(16, 185, 129, .12);--warning: #f59e0b;--warning-bg: rgba(245, 158, 11, .12);--danger: #ef4444;--danger-bg: rgba(239, 68, 68, .12);--text-main: #f9fafb;--text-muted: #9ca3af;--text-dim: #6b7280;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 16px;--radius-xl: 24px;--transition-fast: .15s ease;--transition-normal: .25s cubic-bezier(.4, 0, .2, 1);--shadow-card: 0 10px 30px -10px rgba(0, 0, 0, .5), 0 0 0 1px var(--border-subtle);--shadow-glow: 0 0 30px -5px var(--primary-glow)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-sans);background-color:var(--bg-primary);color:var(--text-main);line-height:1.6;min-height:100vh;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background-image:radial-gradient(at 10% 15%,rgba(99,102,241,.12) 0px,transparent 40%),radial-gradient(at 90% 85%,rgba(139,92,246,.1) 0px,transparent 40%);background-attachment:fixed}h1,h2,h3,h4,h5,h6{color:var(--text-main);font-weight:700;letter-spacing:-.025em;line-height:1.25}h1{font-size:2.25rem}h2{font-size:1.75rem}h3{font-size:1.35rem}h4{font-size:1.15rem}a{color:inherit;text-decoration:none}.container{width:100%;max-width:1240px;margin:0 auto;padding:0 1.5rem}.page-container{padding:2.5rem 0 4rem;min-height:calc(100vh - 140px)}.page-header{margin-bottom:2rem;display:flex;justify-content:space-between;align-items:flex-start;flex-wrap:wrap;gap:1rem}.page-title{font-size:2rem;font-weight:800;background:linear-gradient(135deg,#fff 30%,#9ca3af);-webkit-background-clip:text;-webkit-text-fill-color:transparent}.page-subtitle{color:var(--text-muted);font-size:1rem;margin-top:.35rem}.card{background:var(--bg-card);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);padding:1.5rem;box-shadow:var(--shadow-card);transition:transform var(--transition-normal),border-color var(--transition-normal),box-shadow var(--transition-normal)}.card:hover{border-color:var(--border-accent);box-shadow:var(--shadow-card),var(--shadow-glow)}.card-clickable{cursor:pointer}.card-clickable:hover{transform:translateY(-3px)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;font-family:var(--font-sans);font-weight:600;font-size:.925rem;padding:.65rem 1.25rem;border-radius:var(--radius-md);border:1px solid transparent;cursor:pointer;transition:all var(--transition-fast);white-space:nowrap}.btn:focus-visible{outline:2px solid var(--primary);outline-offset:2px}.btn-primary{background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff;box-shadow:0 4px 15px var(--primary-glow)}.btn-primary:hover:not(:disabled){opacity:.95;transform:translateY(-1px);box-shadow:0 6px 20px #6366f166}.btn-secondary{background:#ffffff0d;border:1px solid var(--border-subtle);color:var(--text-main)}.btn-secondary:hover:not(:disabled){background:#ffffff1a;border-color:#fff3}.btn-danger{background:var(--danger-bg);border:1px solid rgba(239,68,68,.3);color:#fca5a5}.btn-danger:hover:not(:disabled){background:#ef444440;color:#fff}.btn-sm{padding:.4rem .85rem;font-size:.825rem;border-radius:var(--radius-sm)}.btn:disabled{opacity:.5;cursor:not-allowed}.badge{display:inline-flex;align-items:center;gap:.35rem;padding:.25rem .75rem;border-radius:9999px;font-size:.75rem;font-weight:700;text-transform:uppercase;letter-spacing:.05em}.badge-published,.badge-completed,.badge-active{background:var(--success-bg);color:#34d399;border:1px solid rgba(16,185,129,.3)}.badge-draft{background:var(--warning-bg);color:#fbbf24;border:1px solid rgba(245,158,11,.3)}.badge-archived,.badge-dropped{background:#9ca3af1a;color:#9ca3af;border:1px solid rgba(156,163,175,.2)}.badge-admin{background:#6366f126;color:#a5b4fc;border:1px solid var(--border-accent)}.badge-student{background:#06b6d426;color:#67e8f9;border:1px solid rgba(6,182,212,.3)}.form-group{margin-bottom:1.25rem;display:flex;flex-direction:column;gap:.4rem}.form-label{font-size:.875rem;font-weight:600;color:var(--text-muted)}.form-input,.form-select,.form-textarea{width:100%;background:#11182799;border:1px solid var(--border-subtle);border-radius:var(--radius-md);padding:.75rem 1rem;color:var(--text-main);font-family:var(--font-sans);font-size:.95rem;transition:border-color var(--transition-fast),box-shadow var(--transition-fast)}.form-input:focus,.form-select:focus,.form-textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-glow)}.form-textarea{resize:vertical;min-height:120px}.table-wrapper{overflow-x:auto;border-radius:var(--radius-lg);border:1px solid var(--border-subtle);background:var(--bg-card)}.table{width:100%;border-collapse:collapse;text-align:left;font-size:.9rem}.table th{padding:1rem 1.25rem;background:#ffffff05;color:var(--text-muted);font-weight:600;border-bottom:1px solid var(--border-subtle);white-space:nowrap}.table td{padding:1rem 1.25rem;border-bottom:1px solid var(--border-subtle);color:var(--text-main);vertical-align:middle}.table tr:last-child td{border-bottom:none}.table tr:hover td{background:#ffffff05}.progress-container{width:100%;background:#ffffff14;border-radius:9999px;height:8px;overflow:hidden;position:relative}.progress-bar{height:100%;border-radius:9999px;background:linear-gradient(90deg,var(--primary),var(--accent-cyan));transition:width .4s ease-out}.progress-bar-completed{background:linear-gradient(90deg,#10b981,#059669)}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#000000bf;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);display:flex;align-items:center;justify-content:center;z-index:1000;padding:1.5rem;animation:fadeIn .15s ease-out}.modal-content{background:var(--bg-secondary);border:1px solid var(--border-subtle);border-radius:var(--radius-xl);max-width:540px;width:100%;padding:2rem;box-shadow:0 25px 50px -12px #000000b3;animation:scaleUp .2s cubic-bezier(.16,1,.3,1)}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes scaleUp{0%{opacity:0;transform:scale(.96)}to{opacity:1;transform:scale(1)}}.alert{padding:1rem 1.25rem;border-radius:var(--radius-md);margin-bottom:1.5rem;display:flex;align-items:center;gap:.75rem;font-size:.925rem}.alert-error{background:var(--danger-bg);border:1px solid rgba(239,68,68,.3);color:#fca5a5}.alert-success{background:var(--success-bg);border:1px solid rgba(16,185,129,.3);color:#6ee7b7}.alert-info{background:#6366f11f;border:1px solid var(--border-accent);color:#c7d2fe}.empty-state{text-align:center;padding:4rem 2rem;background:var(--bg-card);border:1px dashed var(--border-subtle);border-radius:var(--radius-xl)}.empty-icon{font-size:3rem;margin-bottom:1rem;color:var(--text-dim)}.empty-title{font-size:1.25rem;font-weight:700;margin-bottom:.5rem}.empty-desc{color:var(--text-muted);max-width:400px;margin:0 auto 1.5rem}.skeleton{background:linear-gradient(90deg,#ffffff08 25%,#ffffff14,#ffffff08 75%);background-size:200% 100%;animation:shimmer 1.5s infinite;border-radius:var(--radius-sm)}@keyframes shimmer{0%{background-position:200% 0}to{background-position:-200% 0}}@media(max-width:992px){.course-player-grid{grid-template-columns:1fr!important}.course-player-grid aside{position:static!important;max-height:none!important}}.youtube-player-wrapper iframe{transition:opacity .25s ease}.auth-screen-container{min-height:calc(100vh - 150px);display:flex;align-items:center;justify-content:center;padding:1.75rem 1.5rem 2.5rem;width:100%}.auth-matte-card{width:100%;max-width:580px;background:#111827f0;backdrop-filter:blur(24px);-webkit-backdrop-filter:blur(24px);border:1px solid rgba(255,255,255,.1);border-radius:20px;padding:2.5rem;box-shadow:0 24px 60px -15px #000000bf,0 0 0 1px #ffffff0d;transition:border-color var(--transition-normal),box-shadow var(--transition-normal)}.auth-matte-card:hover{border-color:#6366f159;box-shadow:0 28px 70px -15px #000000d9,0 0 40px -10px #6366f126}.auth-matte-header{text-align:center;margin-bottom:1.75rem}.auth-matte-badge{display:inline-flex;align-items:center;gap:.5rem;padding:.4rem 1rem;background:#6366f11f;border:1px solid rgba(99,102,241,.25);border-radius:9999px;font-size:.825rem;font-weight:600;color:#a5b4fc;margin-bottom:1.25rem;letter-spacing:.02em}.auth-matte-dot{width:7px;height:7px;border-radius:50%;background:#10b981;box-shadow:0 0 8px #10b981}.auth-matte-title{font-size:2.15rem;font-weight:800;color:#fff;letter-spacing:-.03em;margin-bottom:.65rem;line-height:1.2}.auth-matte-subtitle{color:var(--text-muted);font-size:1rem;line-height:1.5;max-width:460px;margin:0 auto}.auth-field-group{margin-bottom:1.5rem;display:flex;flex-direction:column;gap:.5rem}.auth-field-label{font-size:.925rem;font-weight:600;color:#e5e7eb;display:flex;justify-content:space-between;align-items:center}.auth-input-wrapper{position:relative;display:flex;align-items:center;width:100%}.auth-input-icon{position:absolute;left:1.15rem;color:#6b7280;pointer-events:none;display:flex;align-items:center;justify-content:center;transition:color var(--transition-fast)}.auth-input-wrapper:focus-within .auth-input-icon{color:var(--primary)}.auth-matte-input{width:100%;height:52px;padding:0 1.25rem 0 3.25rem;background:#0f172ad9;border:1px solid rgba(255,255,255,.12);border-radius:12px;color:#f9fafb;font-family:var(--font-sans);font-size:1rem;transition:all var(--transition-fast)}.auth-matte-input::placeholder{color:#6b7280;font-size:.95rem}.auth-matte-input:focus{outline:none;background:#0f172afa;border-color:var(--primary);box-shadow:0 0 0 3px #6366f140}.auth-password-toggle{position:absolute;right:1rem;background:transparent;border:none;color:#9ca3af;cursor:pointer;padding:6px;display:flex;align-items:center;justify-content:center;border-radius:6px;transition:color var(--transition-fast),background var(--transition-fast)}.auth-password-toggle:hover{color:#fff;background:#ffffff14}.btn-matte-primary{width:100%;height:52px;border-radius:12px;background:linear-gradient(135deg,#4f46e5,#7c3aed);color:#fff;font-family:var(--font-sans);font-size:1.05rem;font-weight:700;border:1px solid rgba(255,255,255,.15);cursor:pointer;display:flex;align-items:center;justify-content:center;gap:.65rem;box-shadow:0 6px 20px -2px #4f46e566;transition:all var(--transition-fast)}.btn-matte-primary:hover:not(:disabled){opacity:.96;transform:translateY(-2px);box-shadow:0 10px 25px -2px #4f46e58c}.btn-matte-primary:disabled{opacity:.6;cursor:not-allowed;transform:none}.auth-demo-section{margin-top:1.75rem;padding-top:1.35rem;border-top:1px solid rgba(255,255,255,.08);text-align:center}.auth-demo-label{font-size:.775rem;font-weight:700;color:#9ca3af;text-transform:uppercase;letter-spacing:.08em;display:block;margin-bottom:.75rem}.auth-demo-chips{display:flex;gap:.65rem;justify-content:center;flex-wrap:wrap}.auth-demo-chip{background:#ffffff0a;border:1px solid rgba(255,255,255,.08);color:#d1d5db;padding:.45rem .85rem;border-radius:8px;font-size:.825rem;font-weight:600;cursor:pointer;display:inline-flex;align-items:center;gap:.45rem;transition:all var(--transition-fast)}.auth-demo-chip:hover{background:#6366f126;border-color:#6366f159;color:#fff;transform:translateY(-1px)}.auth-trust-footer{margin-top:1.5rem;display:flex;justify-content:center;gap:1.5rem;color:#6b7280;font-size:.8rem;flex-wrap:wrap}.auth-trust-item{display:inline-flex;align-items:center;gap:.35rem}@media(max-width:640px){.auth-matte-card{padding:2rem 1.5rem;border-radius:16px}.auth-matte-title{font-size:1.75rem}.auth-demo-chips{flex-direction:column}.auth-demo-chip{width:100%;justify-content:center}}