:root{--bg-primary: #0f172a;--bg-secondary: #1e293b;--bg-glass: rgba(30, 41, 59, .7);--text-primary: #f8fafc;--text-secondary: #94a3b8;--accent-primary: #3b82f6;--accent-glow: rgba(59, 130, 246, .5);--accent-gold: #fbbf24;--border-glass: rgba(255, 255, 255, .1);--spacing-xs: .25rem;--spacing-sm: .5rem;--spacing-md: 1rem;--spacing-lg: 1.5rem;--spacing-xl: 3rem;--font-sans: "Inter", system-ui, Avenir, Helvetica, Arial, sans-serif;--transition-fast: .2s ease;--transition-medium: .4s ease}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-sans);background-color:var(--bg-primary);color:var(--text-primary);line-height:1.6;overflow-x:hidden;min-height:100vh}.glass-panel{background:var(--bg-glass);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1px solid var(--border-glass);border-radius:12px;box-shadow:0 4px 6px -1px #0000001a,0 2px 4px -1px #0000000f}.glass-button{background:#3b82f633;border:1px solid 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var(--border-glass);background:var(--bg-glass);z-index:10}.logo-area{margin-bottom:var(--spacing-xl);padding:var(--spacing-sm)}.logo-area h2{background:linear-gradient(135deg,#fff,var(--text-secondary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;font-weight:800;letter-spacing:-.5px}.nav-menu{display:flex;flex-direction:column;gap:var(--spacing-sm);flex:1}.nav-item{display:flex;align-items:center;gap:var(--spacing-md);padding:var(--spacing-md);border-radius:8px;color:var(--text-secondary);transition:all var(--transition-fast);cursor:pointer;background:transparent;border:none;font-size:1rem;font-weight:500;width:100%;text-align:left}.nav-item:hover{background:#ffffff0d;color:var(--text-primary)}.nav-item.active{background:#3b82f626;color:var(--accent-primary);border-left:3px solid var(--accent-primary)}.upload-section{margin-top:auto;padding-top:var(--spacing-md);border-top:1px solid 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#0000000f;border-radius:4px}.react-pdf__Page__textContent{border-radius:4px}mark{background-color:var(--accent-gold);color:#000;border-radius:2px;padding:0 2px}.chat-panel{display:flex;flex-direction:column;height:100%;max-width:400px;background-color:var(--bg-glass)}.chat-header{padding:var(--spacing-md);border-bottom:1px solid 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bounce{0%,80%,to{transform:scale(0)}40%{transform:scale(1)}}.quiz-panel{display:flex;flex-direction:column;height:100%;max-width:400px;background-color:var(--bg-glass)}.quiz-header{padding:var(--spacing-md);border-bottom:1px solid var(--border-glass);display:flex;justify-content:space-between;align-items:center;color:var(--text-primary);font-weight:600}.icon-gold{color:var(--accent-gold)}.score-badge{background:#3b82f633;color:var(--accent-primary);padding:4px 8px;border-radius:4px;font-size:.8rem}.questions-list{flex:1;padding:var(--spacing-md);overflow-y:auto;display:flex;flex-direction:column;gap:var(--spacing-lg)}.question-card{background:var(--bg-secondary);padding:var(--spacing-md);border-radius:8px;border:1px solid var(--border-glass)}.question-card.correct{border-color:#10b981}.question-card.incorrect{border-color:#ef4444}.question-text{font-weight:500;margin-bottom:var(--spacing-sm)}.options-grid{display:grid;grid-template-columns:1fr;gap:var(--spacing-sm)}.option-button{background:#ffffff0d;border:1px solid var(--border-glass);color:var(--text-secondary);padding:8px 12px;text-align:left;border-radius:6px;cursor:pointer;transition:all .2s;display:flex;justify-content:space-between;align-items:center}.option-button:hover:not(:disabled){background:#ffffff1a;color:var(--text-primary)}.option-button.selected{border-color:var(--accent-primary);background:#3b82f61a;color:var(--text-primary)}.option-button.correct-answer{background:#10b98133;border-color:#10b981;color:#10b981}.option-button.wrong-answer{background:#ef444433;border-color:#ef4444;color:#ef4444}.icon-faded{opacity:.3;color:var(--text-secondary)}.quiz-footer{padding:var(--spacing-md);border-top:1px solid var(--border-glass);display:flex;justify-content:flex-end}.summary-panel{position:absolute;top:60px;right:var(--spacing-md);bottom:var(--spacing-md);width:400px;max-width:90vw;background-color:var(--bg-glass);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border:1px solid var(--border-glass);border-radius:12px;box-shadow:0 4px 6px #0000001a;display:flex;flex-direction:column;z-index:50;transition:transform var(--transition-medium)}.panel-header{display:flex;align-items:center;justify-content:space-between;padding:var(--spacing-md);border-bottom:1px solid var(--border-glass)}.panel-title{display:flex;align-items:center;gap:var(--spacing-sm);font-weight:600;color:var(--text-primary)}.icon-glow{color:var(--accent-gold);filter:drop-shadow(0 0 5px var(--accent-gold))}.panel-content{flex:1;padding:var(--spacing-md);overflow-y:auto;color:var(--text-secondary);font-size:.95rem}.loading-state,.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;gap:var(--spacing-md);text-align:center}.spinner{width:40px;height:40px;border:4px solid rgba(255,255,255,.1);border-top-color:var(--accent-primary);border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.summary-text p{margin-bottom:var(--spacing-sm);line-height:1.6}.panel-footer{padding:var(--spacing-md);border-top:1px solid var(--border-glass);display:flex;justify-content:flex-end;gap:var(--spacing-sm)}