.study-mode-container{display:flex;flex-direction:column;gap:2rem;max-width:800px;margin:0 auto;padding:1rem;min-height:calc(100vh - 200px);justify-content:center}.study-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:.5rem}.study-progress-text{font-weight:600;color:var(--text-secondary);font-size:.95rem}.progress-bar-container{height:8px;background:var(--bg-tertiary);border-radius:4px;overflow:hidden;margin-bottom:1rem;border:1px solid var(--border-color)}.progress-bar-fill{height:100%;background:linear-gradient(90deg,var(--accent-primary) 0%,var(--accent-hover) 100%);transition:width .3s cubic-bezier(.4,0,.2,1)}.study-card-perspective{perspective:1500px;width:100%;aspect-ratio:16 / 9;min-height:350px;cursor:pointer}.study-card-inner{position:relative;width:100%;height:100%;text-align:center;transition:transform .6s cubic-bezier(.4,0,.2,1);transform-style:preserve-3d}.study-card-perspective.flipped 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h3{font-size:1.1rem;font-weight:600;margin-bottom:1.25rem;color:var(--text-primary)}.export-buttons{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:1.5rem}.btn-export{position:relative;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1rem;padding:2rem 1.5rem;border-radius:var(--radius-lg);border:2px solid transparent;color:#fff;font-weight:600;font-size:1rem;cursor:pointer;transition:all .3s ease;overflow:hidden;box-shadow:var(--shadow-md)}.btn-export:before{content:"";position:absolute;top:0;left:0;right:0;bottom:0;background:linear-gradient(135deg,transparent 0%,rgba(255,255,255,.1) 100%);opacity:0;transition:opacity .3s ease}.btn-export:hover:before{opacity:1}.btn-export:hover{transform:translateY(-4px);box-shadow:0 12px 24px #0003;border-color:#fff3}.btn-export:disabled{opacity:.5;cursor:not-allowed;transform:none}.btn-export:disabled:hover{transform:none;box-shadow:var(--shadow-md)}.btn-export svg{width:48px;height:48px;stroke-width:1.5;filter:drop-shadow(0 2px 4px 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.option-label{background:var(--success);color:#fff}.answer-badge{margin-left:auto;font-size:.75rem;background:var(--success);color:#fff;padding:.15rem .5rem;border-radius:1rem}.start-quiz-btn{background:var(--accent-primary);color:#fff;border:none;padding:.5rem 1rem;border-radius:var(--radius-md);font-weight:500;cursor:pointer;transition:background .2s}.start-quiz-btn:hover{background:var(--accent-hover)}.quiz-game{max-width:600px;margin:0 auto}.quiz-progress{display:flex;flex-direction:column;gap:.5rem;margin-bottom:1.5rem;color:var(--text-secondary);font-size:.9rem}.progress-bar{height:6px;background:var(--bg-secondary);border-radius:3px;overflow:hidden}.progress-fill{height:100%;background:var(--accent-primary);transition:width .3s ease}.quiz-card{background:var(--bg-primary);padding:2.5rem;border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);border:1px solid var(--border-color);margin-bottom:1.5rem}.quiz-question{font-size:1.25rem;margin-bottom:2rem;color:var(--text-primary);line-height:1.4}.quiz-options{display:grid;gap:1rem}.quiz-option{display:flex;justify-content:space-between;align-items:center;padding:1rem 1.25rem;background:var(--bg-secondary);border:2px solid transparent;border-radius:var(--radius-md);cursor:pointer;text-align:left;transition:all .2s;color:var(--text-primary)}.quiz-option:hover:not(:disabled){background:var(--bg-tertiary);transform:translateY(-1px)}.quiz-option.selected{border-color:var(--accent-primary);background:var(--accent-light)}.quiz-option.correct{border-color:var(--success);background:#22c55e1a}.quiz-option.wrong{border-color:var(--error);background:#ef44441a}.option-content{display:flex;align-items:center;gap:1rem}.quiz-footer{margin-top:2rem;display:flex;justify-content:flex-end}.submit-btn,.next-btn{background:var(--accent-primary);color:#fff;border:none;padding:.75rem 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0;text-align:left;background:var(--bg-tertiary);border-radius:var(--radius-md);overflow:hidden}.error-details summary{padding:1rem;cursor:pointer;font-weight:500;color:var(--text-secondary);-webkit-user-select:none;user-select:none}.error-details summary:hover{background:var(--bg-primary)}.error-stack{padding:1rem;margin:0;font-size:.85rem;color:var(--error);overflow-x:auto;white-space:pre-wrap;word-wrap:break-word;max-height:300px;overflow-y:auto}.error-actions{display:flex;gap:1rem;justify-content:center;flex-wrap:wrap}.dashboard-tabs{display:flex;gap:2rem;border-bottom:1px solid var(--border-color);margin-bottom:2rem;padding-bottom:0}.tab-btn{background:none;border:none;padding:1rem .5rem;font-size:1rem;font-weight:500;color:var(--text-secondary);cursor:pointer;position:relative;transition:all .2s ease}.tab-btn:after{content:"";position:absolute;bottom:-1px;left:0;width:100%;height:2px;background:var(--accent-primary);transform:scaleX(0);transition:transform .2s 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#8b5cf666}.toast-container{position:fixed;top:1rem;right:1rem;z-index:9999;display:flex;flex-direction:column;gap:.75rem;max-width:400px;pointer-events:none}.toast{display:flex;align-items:center;gap:.75rem;padding:1rem 1.25rem;background:var(--bg-primary);border:1px solid var(--border-color);border-radius:var(--radius-md);box-shadow:var(--shadow-lg);pointer-events:auto;animation:slideIn .3s ease;min-width:300px}@keyframes slideIn{0%{transform:translate(400px);opacity:0}to{transform:translate(0);opacity:1}}.toast-icon{flex-shrink:0;display:flex;align-items:center;justify-content:center}.toast-success .toast-icon{color:var(--success)}.toast-error .toast-icon{color:var(--error)}.toast-info .toast-icon{color:var(--accent-primary)}.toast-message{flex:1;font-size:.95rem;color:var(--text-primary);line-height:1.4}.toast-close{flex-shrink:0;background:transparent;border:none;color:var(--text-secondary);cursor:pointer;padding:.25rem;border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;transition:all .2s ease}.toast-close:hover{background:var(--bg-secondary);color:var(--text-primary)}.confirm-inline{position:absolute;top:0;left:0;right:0;bottom:0;display:flex;align-items:center;justify-content:space-between;gap:.5rem;padding:0 .75rem;background:var(--bg-tertiary);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);z-index:10;animation:slideInRight .2s ease}@keyframes slideInRight{0%{transform:translate(10px);opacity:0}to{transform:translate(0);opacity:1}}@keyframes expandIn{0%{opacity:0;transform:scale(.95)}to{opacity:1;transform:scale(1)}}.confirm-inline.danger .confirm-text{color:var(--error)}.confirm-text{font-size:.8rem;font-weight:600;color:var(--text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:100px}.confirm-actions{display:flex;gap:.5rem}.btn-confirm-cancel,.btn-confirm-yes{display:flex;align-items:center;justify-content:center;width:28px;height:28px;border-radius:6px;cursor:pointer;transition:all .2s ease;border:none;padding:0}.btn-confirm-cancel{background:var(--bg-primary);color:var(--text-secondary);border:1px solid var(--border-color)!important}.btn-confirm-cancel:hover{background:var(--bg-secondary)}.btn-confirm-yes:hover{filter:brightness(1.1)}.btn-confirm-cancel:hover{background:var(--bg-tertiary);color:var(--text-primary)}.btn-confirm-yes{background:var(--error);color:#fff}.btn-confirm-yes:hover{background:#dc2626;transform:translateY(-1px);box-shadow:0 2px 8px #ef44444d}.inline-prompt{display:flex;flex-direction:column;gap:.75rem;padding:1rem;background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-md);animation:expandIn .2s ease}.inline-prompt-input-wrapper{display:flex;flex-direction:column;gap:.5rem}.inline-prompt-input{padding:.75rem 1rem;border:1px solid var(--border-color);border-radius:var(--radius-md);font-size:.95rem;background:var(--bg-primary);color:var(--text-primary);transition:all .2s ease;font-family:inherit}.inline-prompt-input:focus{outline:none;border-color:var(--accent-primary);box-shadow:0 0 0 2px var(--accent-light)}.inline-prompt-error{font-size:.85rem;color:var(--error)}.inline-prompt-actions{display:flex;gap:.5rem;justify-content:flex-end}.btn-prompt-cancel,.btn-prompt-submit{display:flex;align-items:center;gap:.35rem;padding:.5rem .75rem;border-radius:var(--radius-sm);font-size:.85rem;font-weight:500;cursor:pointer;transition:all .2s ease;border:none}.btn-prompt-cancel{background:var(--bg-primary);color:var(--text-secondary);border:1px solid var(--border-color)}.btn-prompt-cancel:hover{background:var(--bg-tertiary);color:var(--text-primary)}.btn-prompt-submit{background:var(--accent-primary);color:#fff}.btn-prompt-submit:hover{background:var(--accent-hover);transform:translateY(-1px);box-shadow:0 2px 8px #6366f14d}@media(max-width:768px){.toast-container{left:1rem;right:1rem;max-width:none}.toast{min-width:auto}}