*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;transition:background-color .3s ease,color .3s ease}#root{min-height:100vh;background-color:var(--bg-primary, #f5f5f5);color:var(--text-primary, #333);transition:background-color .3s ease,color .3s ease}:root{--bg-primary: #F7F8FA;--bg-secondary: #FFFFFF;--bg-tertiary: #F1F2F6;--text-primary: #1C1C1E;--text-secondary: #6A6A6A;--text-tertiary: #8E8E93;--border-color: #E5E5EA;--shadow: rgba(0, 0, 0, .1);--accent: #FE6B35;--accent-hover: #FF7F52;--accent-pressed: #E45520;--accent-secondary: #2F80ED;--accent-secondary-hover: #1677FF;--lesson-card-bg: #FFFFFF;--lesson-card-border: #E5E5EA;--lesson-number-bg: #FEE4D8;--current-lesson-bg: #EDF4FF;--current-lesson-border: #2F80ED;--button-secondary-bg: #E5E5EA;--button-secondary-text: #1C1C1E;--passed-accent: #d4a574;--passed-accent-hover: #c49564}[data-theme=dark]{--bg-primary: #1D1E22;--bg-secondary: #2A2B2F;--bg-tertiary: #232427;--text-primary: #F2F2F7;--text-secondary: #A9A9AE;--text-tertiary: #8E8E93;--border-color: #3A3B3F;--shadow: rgba(0, 0, 0, .3);--accent: #FE6B35;--accent-hover: #FF7F52;--accent-pressed: #E45520;--accent-secondary: #2F80ED;--accent-secondary-hover: #1677FF;--lesson-card-bg: #2A2B2F;--lesson-card-border: #3A3B3F;--lesson-number-bg: #3B2B23;--current-lesson-bg: #273045;--current-lesson-border: #2F80ED;--button-secondary-bg: #3A3B3F;--button-secondary-text: #F2F2F7;--passed-accent: #b8865b;--passed-accent-hover: #a07852}@keyframes rotate{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.refresh-icon{animation:rotate 2s linear infinite}