:root{--bg-primary: #0a0b10;--bg-secondary: #121420;--bg-tertiary: #1a1d30;--accent-primary: #3b82f6;--accent-secondary: #8b5cf6;--accent-gradient: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);--accent-glow: rgba(59, 130, 246, .15);--text-primary: #f3f4f6;--text-secondary: #9ca3af;--text-muted: #6b7280;--border-color: rgba(255, 255, 255, .08);--border-hover: rgba(255, 255, 255, .15);--success: #10b981;--success-glow: rgba(16, 185, 129, .15);--error: #ef4444;--error-glow: rgba(239, 68, 68, .15);--warning: #f59e0b;--shadow-sm: 0 2px 8px -1px rgba(0, 0, 0, .2);--shadow-md: 0 4px 20px -2px rgba(0, 0, 0, .3);--shadow-lg: 0 10px 30px -5px rgba(0, 0, 0, .4);--font-sans: "Inter", system-ui, -apple-system, sans-serif;--font-display: "Outfit", sans-serif;--radius-sm: 8px;--radius-md: 14px;--radius-lg: 20px;--radius-round: 50%;--transition-fast: .15s ease;--transition-normal: .3s cubic-bezier(.4, 0, .2, 1);--transition-slow: .5s cubic-bezier(.4, 0, .2, 1)}*{box-sizing:border-box;margin:0;padding:0;scrollbar-width:thin;scrollbar-color:var(--border-hover) transparent}body{font-family:var(--font-sans);background-color:var(--bg-primary);color:var(--text-primary);line-height:1.5;overflow-x:hidden;-webkit-font-smoothing:antialiased}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--border-hover)}h1,h2,h3,h4,h5,h6{font-family:var(--font-display);font-weight:600;letter-spacing:-.02em}h1{font-size:2.2rem;background:linear-gradient(to right,#fff,#9ca3af);-webkit-background-clip:text;-webkit-text-fill-color:transparent}p{color:var(--text-secondary)}button{font-family:var(--font-sans);cursor:pointer;border:none;background:none;outline:none;transition:all var(--transition-fast)}input,textarea,select{font-family:var(--font-sans);outline:none;transition:all var(--transition-fast)}.bg-glows{position:fixed;top:0;left:0;width:100vw;height:100vh;z-index:-1;pointer-events:none;overflow:hidden}.glow-1{position:absolute;top:-10%;right:-10%;width:50vw;height:50vw;border-radius:var(--radius-round);background:radial-gradient(circle,rgba(59,130,246,.08) 0%,transparent 70%);filter:blur(80px)}.glow-2{position:absolute;bottom:-10%;left:-10%;width:60vw;height:60vw;border-radius:var(--radius-round);background:radial-gradient(circle,rgba(139,92,246,.06) 0%,transparent 70%);filter:blur(100px)}.app-container{display:flex;min-height:100vh;background-color:var(--bg-primary)}.sidebar{width:280px;background-color:var(--bg-secondary);border-right:1px solid var(--border-color);display:flex;flex-direction:column;padding:24px;flex-shrink:0}@media (max-width: 768px){.sidebar{display:none}}.sidebar-logo{display:flex;align-items:center;gap:12px;margin-bottom:32px}.logo-icon{width:38px;height:38px;border-radius:var(--radius-md);background:var(--accent-gradient);display:flex;align-items:center;justify-content:center;color:#fff;box-shadow:0 4px 15px #3b82f64d}.logo-text{font-family:var(--font-display);font-size:1.25rem;font-weight:800;background:var(--accent-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent}.sidebar-section{margin-bottom:24px}.sidebar-section-title{font-size:.75rem;text-transform:uppercase;color:var(--text-muted);letter-spacing:.1em;margin-bottom:12px;padding-left:8px}.sidebar-menu{list-style:none}.sidebar-item{display:flex;align-items:center;gap:12px;padding:10px 14px;color:var(--text-secondary);border-radius:var(--radius-sm);text-decoration:none;font-size:.95rem;margin-bottom:4px;cursor:pointer;transition:all var(--transition-fast)}.sidebar-item:hover,.sidebar-item.active{color:var(--text-primary);background-color:#ffffff0d}.sidebar-item.active{background:var(--accent-gradient);color:#fff;box-shadow:0 4px 12px #3b82f626}.sidebar-user{margin-top:auto;display:flex;align-items:center;gap:12px;padding-top:16px;border-top:1px solid var(--border-color)}.user-avatar{width:40px;height:40px;border-radius:var(--radius-round);background-color:var(--bg-tertiary);border:2px solid var(--accent-primary);display:flex;align-items:center;justify-content:center;font-weight:700;color:var(--text-primary)}.user-info{flex-grow:1;min-width:0}.user-name{font-size:.9rem;font-weight:600;color:var(--text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.user-email{font-size:.75rem;color:var(--text-muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.logout-btn{color:var(--text-muted);padding:6px;border-radius:var(--radius-sm)}.logout-btn:hover{color:var(--error);background-color:#ef44441a}.main-content{flex-grow:1;padding:40px;max-width:1200px;margin:0 auto;width:100%;display:flex;flex-direction:column;overflow-y:auto}@media (max-width: 768px){.main-content{padding:20px}}.auth-wrapper{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px}.auth-card{width:100%;max-width:420px;background:#121420bf;-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);border:1px solid var(--border-color);padding:40px;border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);display:flex;flex-direction:column;gap:24px}.auth-header{text-align:center}.auth-title{font-size:1.8rem;margin-top:12px;margin-bottom:8px}.form-group{display:flex;flex-direction:column;gap:8px;margin-bottom:16px}.form-label{font-size:.85rem;font-weight:500;color:var(--text-secondary);text-align:left}.form-input{background:var(--bg-tertiary);border:1px solid var(--border-color);padding:12px 16px;border-radius:var(--radius-sm);color:var(--text-primary);font-size:.95rem}.form-input:focus{border-color:var(--accent-primary);box-shadow:0 0 0 3px #3b82f626}.primary-btn{background:var(--accent-gradient);color:#fff;font-weight:600;padding:12px 24px;border-radius:var(--radius-sm);box-shadow:0 4px 15px #3b82f633;display:flex;align-items:center;justify-content:center;gap:8px}.primary-btn:hover{transform:translateY(-2px);box-shadow:0 6px 20px #3b82f64d}.primary-btn:active{transform:translateY(0)}.primary-btn:disabled{opacity:.5;transform:none;cursor:not-allowed;box-shadow:none}.secondary-btn{background:var(--bg-tertiary);border:1px solid var(--border-color);color:var(--text-primary);font-weight:500;padding:12px 24px;border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;gap:8px}.secondary-btn:hover{background-color:var(--bg-secondary);border-color:var(--border-hover)}.google-btn{background-color:#fff;color:#1f2937;font-weight:600;padding:12px 24px;border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;gap:12px}.google-btn:hover{background-color:#f9fafb}.card-glass{background:#121420a6;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:32px;box-shadow:var(--shadow-md)}.dashboard-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px;margin-top:24px}.community-card{background:#121420a6;border:1px solid var(--border-color);border-radius:var(--radius-md);padding:24px;cursor:pointer;position:relative;overflow:hidden;transition:all var(--transition-normal);display:flex;flex-direction:column;gap:12px}.community-card:before{content:"";position:absolute;top:0;left:0;width:100%;height:4px;background:var(--accent-gradient);opacity:0;transition:opacity var(--transition-normal)}.community-card:hover{transform:translateY(-5px);border-color:var(--border-hover);box-shadow:var(--shadow-lg),0 0 15px #3b82f61a}.community-card:hover:before{opacity:1}.community-title{font-family:var(--font-display);font-size:1.2rem;font-weight:600;color:var(--text-primary)}.community-desc{font-size:.85rem;color:var(--text-secondary);line-height:1.4;height:3.6em;overflow:hidden;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical}.community-meta{margin-top:auto;display:flex;align-items:center;justify-content:space-between;font-size:.8rem;color:var(--text-muted)}.community-code-badge{background-color:var(--bg-tertiary);padding:4px 10px;border-radius:20px;font-weight:700;letter-spacing:.05em;color:var(--accent-primary);border:1px dashed rgba(59,130,246,.3)}.modal-overlay{position:fixed;top:0;left:0;width:100vw;height:100vh;background-color:#050508bf;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);z-index:1000;display:flex;align-items:center;justify-content:center;padding:20px;animation:fadeIn var(--transition-fast) forwards}.modal-content{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:32px;max-width:500px;width:100%;box-shadow:var(--shadow-lg);position:relative;display:flex;flex-direction:column;gap:20px;animation:slideUp var(--transition-normal) forwards}.modal-close{position:absolute;top:20px;right:20px;color:var(--text-muted)}.modal-close:hover{color:var(--text-primary)}.view-header{margin-bottom:32px;display:flex;align-items:center;justify-content:space-between;gap:20px}@media (max-width: 640px){.view-header{flex-direction:column;align-items:flex-start}}.breadcrumbs{display:flex;align-items:center;gap:8px;font-size:.85rem;color:var(--text-muted);margin-bottom:12px}.breadcrumb-link{color:var(--text-muted);text-decoration:none;cursor:pointer}.breadcrumb-link:hover{color:var(--text-primary)}.upload-dropzone{border:2px dashed rgba(255,255,255,.15);border-radius:var(--radius-md);padding:40px;text-align:center;background-color:#ffffff03;display:flex;flex-direction:column;align-items:center;gap:16px;cursor:pointer;transition:all var(--transition-normal)}.upload-dropzone:hover,.upload-dropzone.active{border-color:var(--accent-primary);background-color:#3b82f608}.upload-icon-wrapper{width:64px;height:64px;border-radius:var(--radius-round);background-color:var(--bg-tertiary);display:flex;align-items:center;justify-content:center;color:var(--accent-primary);margin-bottom:8px}.quiz-wrapper{max-width:800px;margin:0 auto;width:100%}.quiz-progress-bar{width:100%;height:6px;background-color:var(--bg-tertiary);border-radius:3px;margin-bottom:24px;overflow:hidden}.quiz-progress-fill{height:100%;background:var(--accent-gradient);transition:width .3s cubic-bezier(.4,0,.2,1)}.question-card{background-color:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:40px;margin-bottom:24px;box-shadow:var(--shadow-md);display:flex;flex-direction:column;gap:24px}@media (max-width: 640px){.question-card{padding:24px}}.question-text{font-family:var(--font-display);font-size:1.4rem;line-height:1.4;color:var(--text-primary)}.options-list{display:flex;flex-direction:column;gap:14px}.option-btn{background-color:var(--bg-tertiary);border:1px solid var(--border-color);border-radius:var(--radius-md);padding:16px 20px;display:flex;align-items:center;gap:16px;color:var(--text-primary);text-align:left;font-size:1rem;transition:all var(--transition-fast);position:relative;width:100%}.option-btn:hover:not(:disabled){background-color:#ffffff0d;border-color:var(--border-hover);transform:translate(4px)}.option-letter{width:28px;height:28px;border-radius:var(--radius-round);background-color:#ffffff14;display:flex;align-items:center;justify-content:center;font-weight:600;font-size:.9rem;color:var(--text-secondary);flex-shrink:0}.option-btn:hover .option-letter{background-color:var(--accent-primary);color:#fff}.option-btn.correct{background-color:var(--success-glow);border-color:var(--success);color:#a7f3d0}.option-btn.correct .option-letter{background-color:var(--success);color:#fff}.option-btn.incorrect{background-color:var(--error-glow);border-color:var(--error);color:#fca5a5}.option-btn.incorrect .option-letter{background-color:var(--error);color:#fff}.explanation-box{background-color:#3b82f60f;border-left:4px solid var(--accent-primary);padding:20px;border-radius:0 var(--radius-md) var(--radius-md) 0;animation:slideDown var(--transition-normal) forwards}.explanation-title{font-size:.9rem;text-transform:uppercase;color:var(--accent-primary);font-weight:700;margin-bottom:6px}.explanation-text{font-size:.95rem;line-height:1.5;color:var(--text-primary)}.preview-header-bar{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px}.preview-grid{display:flex;flex-direction:column;gap:20px}.preview-question-card{background-color:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-md);padding:24px;position:relative}.preview-badge-correct{background-color:var(--success);color:#fff;padding:2px 8px;border-radius:4px;font-size:.75rem;font-weight:700;display:inline-block;margin-bottom:12px}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{transform:translateY(20px);opacity:0}to{transform:translateY(0);opacity:1}}@keyframes slideDown{0%{height:0;opacity:0;transform:translateY(-10px)}to{height:auto;opacity:1;transform:translateY(0)}}.status-badge{padding:4px 10px;border-radius:20px;font-size:.75rem;font-weight:700}.status-badge.primary{background-color:#3b82f626;color:var(--accent-primary)}.status-badge.success{background-color:#10b98126;color:var(--success)}