:root{--primary:#4f46e5;--primary-light:#eef2ff;--success:#10b981;--danger:#ef4444;--warning:#f59e0b;--gray-50:#f8fafc;--gray-100:#f1f5f9;--gray-200:#e2e8f0;--gray-400:#94a3b8;--gray-600:#475569;--gray-800:#1e293b;--radius:16px;--radius-sm:10px;--shadow:0 1px 3px #00000014, 0 1px 2px #0000000f;--shadow-lg:0 10px 25px #00000014}*{box-sizing:border-box;margin:0;padding:0}html,body,#root{background:var(--gray-50);height:100%;color:var(--gray-800);-webkit-font-smoothing:antialiased;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;font-size:16px}button{cursor:pointer;font-family:inherit;font-size:inherit;-webkit-tap-highlight-color:transparent;background:0 0;border:none}input,textarea{border:2px solid var(--gray-200);border-radius:var(--radius-sm);outline:none;width:100%;padding:12px 16px;font-family:inherit;font-size:16px;transition:border-color .2s}input:focus,textarea:focus{border-color:var(--primary)}.btn-primary{background:var(--primary);color:#fff;border-radius:var(--radius);width:100%;box-shadow:var(--shadow);padding:14px 28px;font-size:17px;font-weight:600;transition:transform .1s,box-shadow .2s}.btn-primary:active{transform:scale(.97)}.btn-primary:disabled{opacity:.5;transform:none}.btn-outline{color:var(--primary);border-radius:var(--radius);border:2px solid var(--gray-200);background:#fff;width:100%;padding:14px 28px;font-size:17px;font-weight:600;transition:border-color .2s}.btn-outline:active{border-color:var(--primary);background:var(--primary-light)}.btn-link{color:var(--gray-400);text-align:center;width:100%;padding:12px;font-size:15px}.btn-back{padding:8px 12px;font-size:24px;line-height:1}.btn-sm{width:auto;padding:8px 16px;font-size:14px}.profile-picker{flex-direction:column;justify-content:center;align-items:center;gap:24px;min-height:100%;padding:40px 24px;display:flex}.picker-header{text-align:center}.picker-emoji{margin-bottom:12px;font-size:64px;display:block}.picker-header h1{color:var(--gray-800);font-size:28px;font-weight:700}.picker-subtitle{color:var(--gray-400);margin-top:4px;font-size:17px}.student-list{flex-direction:column;gap:10px;width:100%;max-width:400px;display:flex}.student-card{border-radius:var(--radius);box-shadow:var(--shadow);text-align:left;background:#fff;align-items:center;gap:14px;width:100%;padding:18px 20px;transition:transform .1s;display:flex}.student-card:active{transform:scale(.98)}.student-avatar{font-size:36px}.student-info{flex-direction:column;flex:1;display:flex}.student-name{font-size:18px;font-weight:600}.student-grade{color:var(--gray-400);font-size:14px}.student-arrow{color:var(--gray-400);font-size:20px}.new-student-form{flex-direction:column;gap:14px;width:100%;max-width:400px;display:flex}.grade-picker{flex-wrap:wrap;gap:8px;display:flex}.grade-btn{border-radius:var(--radius-sm);border:2px solid var(--gray-200);flex:1;min-width:50px;padding:10px;font-size:15px;font-weight:600;transition:all .15s}.grade-btn.active{border-color:var(--primary);background:var(--primary-light);color:var(--primary)}.chat-container{flex-direction:column;height:100%;display:flex}.chat-header{border-bottom:1px solid var(--gray-200);z-index:10;background:#fff;align-items:center;gap:12px;padding:12px 16px;display:flex;position:sticky;top:0}.chat-student-info{flex-direction:column;flex:1;display:flex}.chat-student-name{font-size:16px;font-weight:600}.chat-student-grade{color:var(--gray-400);font-size:13px}.chat-actions{gap:8px;display:flex}.chat-actions button{padding:6px;font-size:24px}.chat-messages{flex-direction:column;flex:1;gap:16px;padding:16px;display:flex;overflow-y:auto}.chat-welcome{text-align:center;flex-direction:column;align-items:center;gap:16px;padding:40px 20px;display:flex}.welcome-emoji{font-size:48px}.chat-welcome p{color:var(--gray-600);max-width:300px;font-size:18px}.quick-actions{flex-wrap:wrap;justify-content:center;gap:8px;display:flex}.quick-actions button{border:2px solid var(--gray-200);background:#fff;border-radius:20px;padding:10px 18px;font-size:15px;font-weight:500;transition:all .15s}.quick-actions button:active{border-color:var(--primary);background:var(--primary-light)}.message{flex-direction:column;gap:4px;max-width:85%;display:flex}.message.student{align-self:flex-end}.message.agent{align-self:flex-start}.message-sender{color:var(--gray-400);padding:0 4px;font-size:12px;font-weight:500}.message.student .message-sender{text-align:right}.message-bubble{border-radius:var(--radius);white-space:pre-wrap;padding:14px 18px;font-size:16px;line-height:1.5}.message.student .message-bubble{background:var(--primary);color:#fff;border-bottom-right-radius:4px}.message.agent .message-bubble{border:1px solid var(--gray-200);box-shadow:var(--shadow);background:#fff;border-bottom-left-radius:4px}.message-bubble.typing{color:var(--gray-400);padding:10px 20px;font-style:italic}.chat-input{border-top:1px solid var(--gray-200);background:#fff;gap:10px;padding:12px 16px;display:flex;position:sticky;bottom:0}.chat-input input{flex:1}.chat-input button{background:var(--primary);color:#fff;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:44px;height:44px;font-size:22px;transition:transform .1s;display:flex}.chat-input button:active{transform:scale(.9)}.chat-input button:disabled{opacity:.4}.camera-container{background:#000;flex-direction:column;height:100%;display:flex}.camera-header{color:#fff;background:#000c;align-items:center;gap:12px;padding:12px 16px;display:flex}.camera-header button{color:#fff;font-size:18px}.camera-header h3{font-size:18px}.camera-error{background:var(--danger);color:#fff;text-align:center;padding:12px 16px;font-size:14px}.camera-view{flex:1;justify-content:center;align-items:center;display:flex;overflow:hidden}.camera-feed,.camera-preview{object-fit:contain;width:100%;height:100%}.camera-placeholder{text-align:center;color:#fff;cursor:pointer;padding:40px}.camera-placeholder span{margin-bottom:16px;font-size:64px;display:block}.camera-placeholder p{margin-bottom:4px;font-size:18px}.camera-hint{color:var(--gray-400);font-size:14px!important}.camera-controls{background:#000c;justify-content:center;gap:12px;padding:20px;display:flex}.btn-capture{background:#fff3;border:4px solid #fff;border-radius:50%;width:72px;height:72px;font-size:0}.btn-capture:active{background:#fff6}.upload-label{cursor:pointer;text-align:center;display:inline-block}.canvas-page{flex-direction:column;height:100%;display:flex}.canvas-header{border-bottom:1px solid var(--gray-200);background:#fff;align-items:center;gap:12px;padding:12px 16px;display:flex}.canvas-header button,.canvas-header h3{font-size:18px}.canvas-container{background:#fff;flex-direction:column;flex:1;display:flex}.canvas-toolbar{border-bottom:1px solid var(--gray-200);flex-wrap:wrap;align-items:center;gap:12px;padding:10px 16px;display:flex}.color-picker{gap:6px;display:flex}.color-swatch{border:3px solid #0000;border-radius:50%;width:28px;height:28px;transition:transform .15s}.color-swatch.active{border-color:var(--gray-800);transform:scale(1.2)}.size-picker{gap:6px;display:flex}.size-btn{border:2px solid var(--gray-200);background:#fff;border-radius:50%;justify-content:center;align-items:center;width:36px;height:36px;display:flex}.size-btn span{background:var(--gray-800);border-radius:50%;display:block}.size-btn.active{border-color:var(--primary)}.drawing-canvas{touch-action:none;background:#fff;flex:1;width:100%}.dictation-container{flex-direction:column;height:100%;display:flex}.dictation-header{border-bottom:1px solid var(--gray-200);background:#fff;align-items:center;gap:12px;padding:12px 16px;display:flex}.dictation-header button,.dictation-header h3{font-size:18px}.dictation-input,.dictation-review,.dictation-quiz,.dictation-results{flex-direction:column;flex:1;gap:20px;padding:24px;display:flex;overflow-y:auto}.dictation-input p{color:var(--gray-600);font-size:16px}.dictation-input textarea{resize:none;flex:1;min-height:200px;font-size:18px;line-height:1.6}.review-hint{color:var(--gray-400);text-align:center;font-size:15px}.word-list{flex-direction:column;gap:8px;display:flex}.word-item{border-radius:var(--radius-sm);box-shadow:var(--shadow);background:#fff;align-items:center;gap:12px;padding:14px 16px;display:flex}.word-item.error{border-left:4px solid var(--danger);background:#fef2f2}.word-item.boss{border-left:4px solid var(--warning);background:#fffbeb}.word-index{color:var(--gray-400);min-width:24px;font-size:14px;font-weight:600}.word-text{flex:1;font-size:18px;font-weight:500}.btn-speak{padding:6px;font-size:24px}.boss-badge{background:var(--warning);color:#fff;border-radius:10px;padding:2px 8px;font-size:12px;font-weight:600}.quiz-progress{text-align:center;color:var(--gray-400);font-size:14px}.progress-bar{background:var(--gray-200);border-radius:3px;height:6px;margin-top:8px;overflow:hidden}.progress-fill{background:var(--primary);border-radius:3px;height:100%;transition:width .3s}.quiz-speaker{text-align:center;padding:20px}.btn-speak-large{background:var(--primary-light);border-radius:50%;margin-bottom:12px;padding:20px;font-size:64px;transition:transform .1s}.btn-speak-large:active{transform:scale(.9)}.quiz-speaker p{color:var(--gray-600);font-size:17px}.quiz-input{text-align:center;padding:16px;font-size:20px}.dictation-results h4{text-align:center;color:var(--success);font-size:22px}.error-section h5{color:var(--danger);margin-bottom:12px;font-size:17px}.result-hint{color:var(--gray-400);text-align:center;margin-top:12px;font-size:14px}.result-actions{flex-direction:column;gap:10px;display:flex}.google-login{flex-direction:column;justify-content:center;align-items:center;gap:20px;min-height:100%;padding:40px 24px;display:flex}.login-header{text-align:center}.login-emoji{margin-bottom:12px;font-size:56px;display:block}.login-header h2{font-size:24px;font-weight:700}.login-header p{color:var(--gray-400);margin-top:4px;font-size:16px}.login-error{color:var(--danger);font-size:14px}.mock-login-notice{flex-direction:column;align-items:center;gap:16px;max-width:340px;display:flex}.login-hint{color:var(--gray-400);text-align:center;font-size:13px;line-height:1.5}.mock-login-notice code{background:var(--gray-100);border-radius:4px;padding:2px 6px;font-size:12px}.parent-dashboard{flex-direction:column;min-height:100%;display:flex}.dashboard-header{border-bottom:1px solid var(--gray-200);z-index:10;background:#fff;justify-content:space-between;align-items:center;padding:16px 20px;display:flex;position:sticky;top:0}.dashboard-user{align-items:center;gap:12px;display:flex}.user-avatar,.user-avatar-placeholder{background:var(--gray-100);border-radius:50%;justify-content:center;align-items:center;width:40px;height:40px;font-size:22px;display:flex}.dashboard-user h2{font-size:17px;font-weight:600}.user-email{color:var(--gray-400);font-size:13px}.dashboard-content{flex:1;padding:20px;overflow-y:auto}.dashboard-section-title{margin-bottom:16px;font-size:18px;font-weight:600}.dashboard-empty{text-align:center;padding:48px 20px}.empty-emoji{margin-bottom:12px;font-size:48px;display:block}.empty-hint{color:var(--gray-400);margin-top:8px;font-size:14px}.dashboard-children{flex-direction:column;gap:16px;display:flex}.child-report-card{border-radius:var(--radius);box-shadow:var(--shadow);background:#fff;padding:20px}.child-header{align-items:center;gap:12px;margin-bottom:16px;display:flex}.child-avatar{font-size:32px}.child-grade{color:var(--gray-400);font-size:13px}.child-stats{border-bottom:1px solid var(--gray-100);gap:24px;margin-bottom:12px;padding:12px 0;display:flex}.stat-item{flex-direction:column;display:flex}.stat-label{color:var(--gray-400);font-size:12px}.stat-value{font-size:18px;font-weight:600}.child-section{align-items:center;gap:10px;padding:8px 0;display:flex}.section-icon{font-size:18px}.section-text{color:var(--gray-400);font-size:14px}.picker-actions{flex-direction:column;gap:12px;width:100%;max-width:400px;display:flex}.btn-parent{color:var(--gray-600);border-radius:var(--radius);border:2px solid var(--gray-200);background:0 0;width:100%;padding:14px 28px;font-size:17px;font-weight:600;transition:all .15s}.btn-parent:active{border-color:var(--primary);background:var(--primary-light)}@media (width>=768px){.chat-messages{padding:24px 32px}.message{max-width:70%}.profile-picker{padding:60px 40px}.quick-actions button{padding:12px 24px;font-size:16px}.dictation-input,.dictation-review,.dictation-quiz,.dictation-results{padding:32px 40px}}@supports (padding-top:env(safe-area-inset-top)){.chat-header,.camera-header,.dictation-header,.canvas-header{padding-top:calc(12px + env(safe-area-inset-top))}.chat-input{padding-bottom:calc(12px + env(safe-area-inset-bottom))}}