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0}.calendar-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:2px}.calendar-day{aspect-ratio:1;display:flex;flex-direction:column;align-items:center;justify-content:center;border-radius:var(--radius-sm);font-size:.7rem;min-width:28px;min-height:28px;background:var(--bg-tertiary);color:var(--text-secondary);position:relative}.calendar-day.empty{background:transparent}.calendar-day.before-first{background:var(--bg-tertiary);opacity:.3}.calendar-day.future{opacity:.4}.calendar-day.active{background:var(--gradient-dreampop);color:var(--deep-space);font-weight:600}.day-number{font-size:.7rem;line-height:1}.day-count{font-size:.55rem;line-height:1;margin-top:1px;opacity:.9}@media (max-width:900px){.sidebar{width:280px;min-width:280px}.header-top{flex-direction:column;align-items:flex-start;gap:12px}}@media (max-width:700px){.app{flex-direction:column}.sidebar{width:100%;min-width:100%;max-height:40vh}.chat-messages{padding:20px}.message{max-width:90%}}.tool-header{display:flex;align-items:center;gap:10px;padding:12px 16px;background:var(--gradient-dreampop);border-radius:var(--radius-md) var(--radius-md) 0 0;font-weight:600}.tool-icon{font-size:1.25rem}.tool-title{flex:1;font-size:.95rem;color:var(--deep-space)}.tool-quiz{margin-top:12px;background:var(--bg-secondary);border-radius:var(--radius-md);border:1px solid var(--border);overflow:hidden}.quiz-questions{padding:16px;display:flex;flex-direction:column;gap:20px}.quiz-question{padding:16px;background:var(--bg-tertiary);border-radius:var(--radius-sm)}.question-number{font-size:.7rem;text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted);margin-bottom:6px}.question-text{font-weight:500;margin-bottom:12px;color:var(--text-primary)}.question-options{display:flex;flex-direction:column;gap:8px;margin-bottom:12px}.question-option{display:flex;align-items:center;gap:10px;padding:10px 14px;background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius-sm);transition:all .2s ease}.question-option.correct{background:rgba(34,197,94,.1);border-color:var(--success)}.option-letter{width:24px;height:24px;display:flex;align-items:center;justify-content:center;background:var(--bg-tertiary);border-radius:50%;font-size:.75rem;font-weight:600;color:var(--text-secondary)}.question-option.correct .option-letter{background:var(--success);color:#fff}.option-text{flex:1;font-size:.9rem;color:var(--text-secondary)}.correct-badge{color:var(--success);font-weight:600}.reveal-answer-btn{padding:8px 14px;background:var(--bg-secondary);border:1px solid var(--border-strong);border-radius:var(--radius-sm);font-family:var(--font-sans);font-size:.8rem;color:var(--text-secondary);cursor:pointer;transition:all .2s ease}.reveal-answer-btn:hover{background:var(--bg-hover);border-color:var(--periwinkle);color:var(--text-primary)}.tool-flashcards{margin-top:12px;background:var(--bg-secondary);border-radius:var(--radius-md);border:1px solid var(--border);overflow:hidden}.card-counter{font-size:.8rem;font-weight:500;padding:4px 10px;background:rgba(0,0,0,.1);border-radius:12px;color:var(--deep-space)}.flashcard{margin:16px;height:200px;perspective:1000px;cursor:pointer}.flashcard-inner{width:100%;height:100%;position:relative;transition:transform .6s;transform-style:preserve-3d}.flashcard.flipped .flashcard-inner{transform:rotateY(180deg)}.flashcard-back,.flashcard-front{position:absolute;width:100%;height:100%;backface-visibility:hidden;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:24px;border-radius:var(--radius-md);text-align:center}.flashcard-front{background:linear-gradient(135deg,rgba(162,210,255,.3),rgba(199,185,255,.2));border:1px solid var(--light-blue)}.flashcard-back{background:linear-gradient(135deg,rgba(199,185,255,.3),rgba(162,210,255,.2));border:1px solid var(--periwinkle);transform:rotateY(180deg)}.flashcard-label{font-size:.7rem;text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted);margin-bottom:12px}.flashcard-content{font-size:1.1rem;font-weight:500;color:var(--text-primary);flex:1;display:flex;align-items:center;line-height:1.5}.flashcard-hint{font-size:.7rem;color:var(--text-muted);margin-top:12px}.flashcard-nav{display:flex;justify-content:center;gap:12px;padding:0 16px 16px}.flashcard-btn{padding:8px 20px;background:var(--bg-tertiary);border:1px solid var(--border);border-radius:var(--radius-sm);font-family:var(--font-sans);font-size:.85rem;color:var(--text-secondary);cursor:pointer;transition:all .2s ease}.flashcard-btn:hover:not(:disabled){background:var(--bg-hover);border-color:var(--periwinkle);color:var(--text-primary)}.flashcard-btn:disabled{opacity:.4;cursor:not-allowed}.tool-revision{margin-top:12px;background:var(--bg-secondary);border-radius:var(--radius-md);border:1px solid var(--border);overflow:hidden}.revision-content{padding:16px 20px;font-size:.9rem;line-height:1.7;color:var(--text-primary)}.revision-content h2,.revision-content h3,.revision-content h4{margin:16px 0 8px;font-weight:600;color:var(--text-primary)}.revision-content h2{font-size:1.2rem}.revision-content h3{font-size:1.05rem}.revision-content h4{font-size:.95rem}.revision-content ol,.revision-content ul{margin:8px 0;padding-left:20px}.revision-content li{margin:4px 0}.revision-content code{font-family:var(--font-mono);background:var(--bg-tertiary);padding:2px 6px;border-radius:4px;font-size:.85em}.revision-content pre{margin:12px 0;padding:14px;background:var(--bg-tertiary);border-radius:var(--radius-sm);overflow-x:auto}.tool-podcast{margin-top:12px;background:var(--bg-secondary);border-radius:var(--radius-md);border:1px solid var(--border);overflow:hidden}.podcast-duration{font-size:.8rem;font-weight:500;padding:4px 10px;background:rgba(0,0,0,.1);border-radius:12px;color:var(--deep-space)}.podcast-audio{width:calc(100% - 32px);margin:16px;height:40px}.podcast-script-toggle{display:block;width:calc(100% - 32px);margin:0 16px 16px;padding:10px 14px;background:var(--bg-tertiary);border:1px solid var(--border);border-radius:var(--radius-sm);font-family:var(--font-sans);font-size:.85rem;color:var(--text-secondary);cursor:pointer;transition:all .2s ease;text-align:center}.podcast-script-toggle:hover{background:var(--bg-hover);border-color:var(--periwinkle);color:var(--text-primary)}.podcast-script{margin:0 16px 16px;padding:16px;background:var(--bg-tertiary);border-radius:var(--radius-sm);max-height:400px;overflow-y:auto}.script-segment{margin-bottom:12px;padding-bottom:12px;border-bottom:1px solid var(--border)}.script-segment:last-child{margin-bottom:0;padding-bottom:0;border-bottom:none}.script-speaker{font-weight:600;color:var(--tropical-indigo);margin-right:8px}.script-text{color:var(--text-secondary);line-height:1.6}