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var(--border);background:var(--card);position:relative;font-family:STKaiti,KaiTi,serif;font-size:22px;color:var(--text)}.prog-char.practiced{border-color:var(--vermillion);background:var(--vermillion-light);color:var(--vermillion)}.prog-char-count{position:absolute;bottom:1px;right:3px;font-family:sans-serif;font-size:8px;color:var(--text-3)}.reset-row{text-align:center;padding:20px 0}.reset-btn{background:none;border:none;color:var(--text-3);font-size:13px;cursor:pointer;text-decoration:underline;font-family:inherit}:root{--primary: #c41e3a;--primary-dark: #8b0000;--primary-light: #ff6b6b;--secondary: #ffd700;--accent: #228b22;--background: #f8f9fa;--surface: #ffffff;--text-primary: #1a1a2e;--text-secondary: #4a5568;--text-muted: #718096;--border: #e2e8f0;--success: #10b981;--warning: #f59e0b;--error: #ef4444;--info: #3b82f6;--spacing-xs: .25rem;--spacing-sm: .5rem;--spacing-md: 1rem;--spacing-lg: 1.5rem;--spacing-xl: 2rem;--spacing-2xl: 3rem;--radius-sm: .25rem;--radius-md: 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var(--spacing-sm);border-radius:var(--radius-full);font-size:.75rem;font-weight:500}.badge-success{background:#10b9811a;color:var(--success)}.badge-warning{background:#f59e0b1a;color:var(--warning)}.badge-error{background:#ef44441a;color:var(--error)}.badge-info{background:#3b82f61a;color:var(--info)}.badge-primary{background:#c41e3a1a;color:var(--primary)}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000}.modal{background:var(--surface);border-radius:var(--radius-lg);width:90%;max-width:500px;max-height:90vh;overflow-y:auto;box-shadow:var(--shadow-lg)}.modal-header{padding:var(--spacing-lg);border-bottom:1px solid var(--border);display:flex;justify-content:space-between;align-items:center}.modal-body{padding:var(--spacing-lg)}.modal-footer{padding:var(--spacing-lg);border-top:1px solid var(--border);display:flex;justify-content:flex-end;gap:var(--spacing-sm)}.login-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--primary-dark) 0%,var(--primary) 100%)}.login-container{background:var(--surface);padding:var(--spacing-2xl);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);width:100%;max-width:420px}.login-header{text-align:center;margin-bottom:var(--spacing-xl)}.login-header h1{font-size:1.75rem;margin-bottom:var(--spacing-sm);color:var(--primary)}.login-header p{color:var(--text-muted)}.language-selector{display:flex;justify-content:center;gap:var(--spacing-sm);margin-bottom:var(--spacing-xl)}.language-btn{padding:var(--spacing-sm) var(--spacing-md);border:1px solid var(--border);background:transparent;border-radius:var(--radius-md);cursor:pointer;transition:all 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var(--info)}.chat-container{display:flex;flex-direction:column;height:500px}.chat-messages{flex:1;overflow-y:auto;padding:var(--spacing-md);background:var(--background);border-radius:var(--radius-md)}.chat-message{max-width:80%;padding:var(--spacing-md);border-radius:var(--radius-md);margin-bottom:var(--spacing-sm)}.chat-message.user{background:var(--primary);color:#fff;margin-left:auto}.chat-message.assistant{background:var(--surface);border:1px solid var(--border)}.chat-input-area{display:flex;gap:var(--spacing-sm);padding-top:var(--spacing-md)}.chat-input-area input{flex:1}.qr-code-container{display:flex;flex-direction:column;align-items:center;padding:var(--spacing-xl)}.qr-code-container svg{border:8px solid white;box-shadow:var(--shadow-md)}@media (max-width: 768px){.sidebar{width:100%;position:relative;height:auto}.main-content{margin-left:0}.stats-grid{grid-template-columns:1fr}.app-layout{flex-direction:column}}.tabs{display:flex;border-bottom:1px solid var(--border);margin-bottom:var(--spacing-lg)}.tab{padding:var(--spacing-md) var(--spacing-lg);border:none;background:none;cursor:pointer;font-weight:500;color:var(--text-muted);border-bottom:2px solid transparent;transition:all .2s}.tab:hover{color:var(--text-primary)}.tab.active{color:var(--primary);border-bottom-color:var(--primary)}.progress-bar{height:8px;background:var(--border);border-radius:var(--radius-full);overflow:hidden}.progress-fill{height:100%;background:var(--primary);transition:width .3s ease}.user-header{display:flex;align-items:center;gap:var(--spacing-md);padding:var(--spacing-md);background:#ffffff0d;border-radius:var(--radius-md);margin-top:auto}.user-avatar{width:40px;height:40px;border-radius:50%;background:var(--secondary);display:flex;align-items:center;justify-content:center;font-weight:600;color:var(--primary-dark)}.user-info h4{font-size:.875rem}.user-info 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