*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--color-bg: #f0f2f5;--color-surface: #ffffff;--color-primary: #4f46e5;--color-primary-light: #818cf8;--color-primary-dark: #3730a3;--color-text: #1e293b;--color-text-secondary: #64748b;--color-border: #e2e8f0;--color-user-bubble: #4f46e5;--color-user-text: #ffffff;--color-tutor-bubble: #ffffff;--color-tutor-text: #1e293b;--color-score-gain: #16a34a;--color-score-loss: #dc2626;--color-error: #fef2f2;--color-error-text: #991b1b;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .07), 0 2px 4px -2px rgba(0, 0, 0, .05);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .08), 0 4px 6px -4px rgba(0, 0, 0, .05);--radius-sm: 8px;--radius-md: 12px;--radius-lg: 20px;--radius-full: 9999px}html,body,#root{height:100%}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe 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ease}.send-button:hover:not(:disabled){background:var(--color-primary-dark);transform:scale(1.05)}.send-button:active:not(:disabled){transform:scale(.95)}.send-button:disabled{opacity:.4;cursor:not-allowed}@media(max-width:600px){.header-content{padding:12px 16px}.header-title h1{font-size:1.1rem}.score-display{padding:6px 14px;min-width:100px}.score-value{font-size:1.25rem}.message-bubble{max-width:85%}.app-main{padding:0 8px 8px}}