:root{--bg-color: #F3F4F6;--surface-color: #FFFFFF;--primary-color: #4F46E5;--primary-light: #818CF8;--text-primary: #111827;--text-secondary: #6B7280;--border-color: #E5E7EB;--color-danger: #EF4444;--color-warning: #F59E0B;--color-success: #10B981;--shadow-sm: 0 1px 2px 0 rgba(0,0,0,.05);--shadow-md: 0 4px 6px -1px rgba(0,0,0,.1);--shadow-lg: 0 10px 15px -3px rgba(0,0,0,.1);--radius-md: .75rem;--radius-lg: 1rem}*{box-sizing:border-box;margin:0;padding:0}body{font-family:system-ui,sans-serif;background:var(--bg-color);color:var(--text-primary);line-height:1.5}.app-container{max-width:800px;margin:0 auto;padding:1rem;min-height:100vh;display:flex;flex-direction:column}.app-header{display:flex;justify-content:space-between;align-items:center;padding:1rem 0;margin-bottom:1rem}.header-left{display:flex;align-items:center;gap:.75rem}.logo-icon{background:linear-gradient(135deg,var(--primary-color),var(--primary-light));color:#fff;padding:.5rem;border-radius:.5rem}.cloud-status{display:flex;align-items:center;gap:.25rem;font-size:.75rem;background:var(--surface-color);padding:.25rem .5rem;border-radius:1rem;box-shadow:var(--shadow-sm)}.text-warning{color:var(--color-warning)}.text-success{color:var(--color-success)}.app-nav{display:flex;gap:.5rem;background:var(--surface-color);padding:.5rem;border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);margin-bottom:1.5rem;overflow-x:auto}.nav-btn{flex:1;min-width:80px;display:flex;align-items:center;justify-content:center;gap:.5rem;padding:.75rem;border:none;background:transparent;color:var(--text-secondary);font-weight:600;border-radius:var(--radius-md);cursor:pointer;transition:.2s}.nav-btn.active{background:var(--primary-color);color:#fff;box-shadow:var(--shadow-md)}.app-main{flex:1}.filters-bar{display:flex;gap:1rem;margin-bottom:1.5rem;flex-wrap:wrap}.search-box{flex:1;min-width:200px;display:flex;align-items:center;gap:.5rem;background:var(--surface-color);padding:.5rem 1rem;border-radius:var(--radius-md);box-shadow:var(--shadow-sm)}.search-box input{border:none;outline:none;width:100%}.filter-select{padding:.5rem 1rem;border:none;border-radius:var(--radius-md);background:var(--surface-color);box-shadow:var(--shadow-sm);outline:none;cursor:pointer}.cards-grid{display:flex;flex-direction:column;gap:1rem}.mistake-card{background:var(--surface-color);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);overflow:hidden;transition:.3s}.mistake-card.expanded{box-shadow:var(--shadow-lg)}.card-header{display:flex;justify-content:space-between;padding:1rem 1.25rem .5rem}.badge{padding:.25rem .75rem;border-radius:1rem;font-size:.75rem;font-weight:600;background:#eef2ff;color:var(--primary-color)}.card-actions{display:flex;gap:.5rem}.icon-btn{background:transparent;border:none;color:var(--text-secondary);cursor:pointer;padding:.25rem;border-radius:.25rem}.icon-btn:hover{background:var(--bg-color);color:var(--text-primary)}.card-content{padding:.5rem 1.25rem 1rem;font-size:1.1rem;font-weight:500;white-space:pre-wrap}.card-details{padding:0 1.25rem 1rem;border-top:1px dashed var(--border-color);margin-top:.5rem;background:#f9fafb}.detail-section{margin-top:1rem}.detail-section h4{font-size:.85rem;color:var(--text-secondary);margin-bottom:.25rem}.analysis-text{font-size:.95rem;color:#4b5563;white-space:pre-wrap;border-left:3px solid var(--primary-light);padding-left:.75rem}.card-footer{display:flex;justify-content:space-between;padding:.75rem 1.25rem;border-top:1px solid var(--border-color)}.mastery-controls{display:flex;align-items:center;gap:.5rem}.mastery-dot{width:16px;height:16px;border-radius:50%;border:2px solid;cursor:pointer;background:transparent}.mastery-dot[data-level=未掌握]{border-color:var(--color-danger)}.mastery-dot[data-level=未掌握].active{background:var(--color-danger)}.mastery-dot[data-level=复习中]{border-color:var(--color-warning)}.mastery-dot[data-level=复习中].active{background:var(--color-warning)}.mastery-dot[data-level=已掌握]{border-color:var(--color-success)}.mastery-dot[data-level=已掌握].active{background:var(--color-success)}.mastery-label{font-size:.85rem;font-weight:600;margin-left:.5rem}.mastery-label[data-level=未掌握]{color:var(--color-danger)}.mastery-label[data-level=复习中]{color:var(--color-warning)}.mastery-label[data-level=已掌握]{color:var(--color-success)}.expand-btn{background:transparent;border:none;cursor:pointer;color:var(--text-secondary)}.review-container{display:flex;flex-direction:column;align-items:center;padding:2rem 0}.flashcard-scene{width:100%;max-width:500px;height:350px;perspective:1000px;cursor:pointer}.flashcard{width:100%;height:100%;position:relative;transform-style:preserve-3d}.flashcard-face{position:absolute;width:100%;height:100%;backface-visibility:hidden;background:var(--surface-color);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);padding:2rem;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center}.flashcard-face.back{transform:rotateY(180deg);overflow-y:auto;align-items:flex-start;text-align:left}.review-actions{display:flex;gap:1rem;margin-top:2rem;width:100%;max-width:500px}.review-actions button{flex:1;padding:.75rem;border:none;border-radius:var(--radius-md);color:#fff;font-weight:600;cursor:pointer;display:flex;justify-content:center;gap:.5rem}.btn-danger{background:var(--color-danger)}.btn-warning{background:var(--color-warning)}.btn-success{background:var(--color-success)}.stats-container{background:var(--surface-color);padding:2rem;border-radius:var(--radius-lg);text-align:center}.stats-summary{display:flex;justify-content:center;gap:3rem;margin-top:2rem}.stat-num{font-size:3rem;font-weight:800;color:var(--primary-color);display:block}.calc-module{display:flex;gap:1rem;max-width:600px;margin:0 auto;background:var(--surface-color);padding:1rem;border-radius:var(--radius-lg);box-shadow:var(--shadow-lg)}.calc-history-panel{flex:1;border-right:1px solid var(--border-color);padding-right:1rem;max-height:400px;overflow-y:auto}.history-item{font-size:.85rem;color:var(--text-secondary);padding:.5rem 0;border-bottom:1px dashed var(--border-color)}.calc-body{flex:2;display:flex;flex-direction:column;gap:1rem}.calc-display{background:#1e293b;color:#10b981;font-family:monospace;font-size:2rem;padding:1rem;border-radius:var(--radius-md);text-align:right;overflow:hidden;text-shadow:0 0 10px rgba(16,185,129,.5)}.calc-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:.5rem}.calc-btn{padding:1rem;font-size:1.25rem;border:none;border-radius:var(--radius-md);background:var(--bg-color);cursor:pointer;font-weight:600;transition:.1s}.calc-btn:active{transform:scale(.95)}.calc-btn.zero{grid-column:span 2}.calc-btn.op{background:var(--primary-light);color:#fff}.game-module{background:linear-gradient(to bottom,#0f172a,#1e293b);border-radius:var(--radius-lg);padding:2rem;color:#fff;min-height:500px;position:relative;overflow:hidden;box-shadow:0 10px 30px #00000080}.game-header .hud{display:flex;justify-content:space-between;font-weight:700;font-family:monospace;font-size:1.2rem;text-shadow:0 0 5px var(--primary-light)}.game-center{display:flex;flex-direction:column;align-items:center;justify-content:center;height:400px;gap:1rem}.game-arena{display:flex;flex-direction:column;height:400px;justify-content:space-between}.game-entities{flex:1;display:flex;flex-direction:column;justify-content:space-between;align-items:center;padding:2rem 0}.enemies-row{display:flex;gap:2rem;width:100%;justify-content:center}.entity{position:relative;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:transform .2s}.entity:hover{transform:scale(1.1)}.entity img{width:60px;height:60px;object-fit:contain;position:absolute;z-index:2;filter:drop-shadow(0 0 10px rgba(255,255,255,.3))}.entity svg{position:absolute;z-index:1;opacity:.5}.game-controls{display:flex;justify-content:center;gap:1rem}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;z-index:100;padding:1rem}.modal-content{background:var(--surface-color);width:100%;max-width:500px;border-radius:var(--radius-lg);padding:1.5rem;box-shadow:var(--shadow-lg)}.form-group{margin-bottom:1rem}.form-group label{display:block;font-size:.85rem;font-weight:600;margin-bottom:.25rem}.form-group input,.form-group select,.form-group textarea{width:100%;padding:.75rem;border:1px solid var(--border-color);border-radius:var(--radius-md);outline:none}.ai-assist-box{margin-bottom:1rem}.ai-btn{background:var(--primary-color);color:#fff;border:none;padding:.5rem 1rem;border-radius:var(--radius-md);font-weight:600;cursor:pointer;display:inline-flex;align-items:center;gap:.5rem}.ai-btn:disabled{opacity:.7}.modal-actions{display:flex;justify-content:flex-end;gap:1rem;margin-top:2rem}.primary-btn{background:var(--primary-color);color:#fff;border:none;padding:.5rem 1rem;border-radius:var(--radius-md);font-weight:600;cursor:pointer;display:flex;align-items:center;gap:.5rem}.primary-btn.huge{font-size:1.25rem;padding:1rem 2rem}.btn-secondary{background:#fff;border:1px solid var(--border-color);padding:.5rem 1rem;border-radius:var(--radius-md);cursor:pointer}.spin{animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}