:root{font-family:Inter,system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color-scheme:light dark;color:#ffffffde;background-color:#f5f5f5;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;--text-color: #213547;--text-muted: #666;--text-dark: #333;--subtitle-color: #666;--white: #fff;--background: #f5f5f5;--card-background: #fff;--input-bg: #fff;--code-bg: #fff;--modal-bg: #fff;--border-color: #e0e0e0;--border-light: #ddd;--border-dark: #ccc;--primary-color: #646cff;--primary-hover: #535bf2;--button-disabled: #ccc;--error-color: #f44336;--error-hover: #d32f2f;--secondary-error: #dc3545;--secondary-error-hover: #c82333;--radius-sm: 16px;--radius-md: 20px;--radius-lg: 24px;--radius-xl: 30px;--radius-full: 9999px;--success-color: #28a745;--success-bg: #d4edda;--success-border: #c3e6cb;--success-text: #155724;--error-bg: #f8d7da;--error-border: #f5c6cb;--error-text: #721c24}*{box-sizing:border-box}body{margin:0;padding:0;min-height:100vh}h1,h2,h3,h4,h5,h6{color:#213547}@media(prefers-color-scheme:dark){:root{color:#ffffffde;background-color:#242424;--text-color: #ffffff;--text-muted: #aaaaaa;--text-dark: #eeeeee;--subtitle-color: #aaaaaa;--white: #fff;--background: #242424;--card-background: #2a2a2a;--input-bg: #333;--code-bg: #1a1a1a;--modal-bg: #2a2a2a;--border-color: #404040;--border-light: #505050;--border-dark: #555;--primary-color: #646cff;--primary-hover: #747bff;--button-disabled: #555;--error-color: #ff5252;--error-hover: #ff6e6e;--secondary-error: #ff5252;--secondary-error-hover: #ff6e6e;--success-color: #66bb6a;--success-bg: #1e4620;--success-border: #2d5a2e;--success-text: #7fc57f;--error-bg: #4a1f1f;--error-border: #6b2929;--error-text: #ff9999}h1,h2,h3,h4,h5,h6{color:#fff}.card{background:#2a2a2a!important}.card h2{color:#fff!important}.card p,.card ul,.card ul li{color:#ccc!important}.subtitle{color:#aaa!important}}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.app-container{min-height:100vh;display:flex;flex-direction:column;align-items:center;padding:2rem}.app-header{text-align:center;margin-bottom:3rem}.app-header h1{font-size:3rem;margin-bottom:.5rem;background:linear-gradient(135deg,#667eea,#764ba2);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.subtitle{font-size:1.2rem;color:var(--subtitle-color, #666);margin:0}.app-main{flex:1;width:100%;max-width:800px}.card{background:var(--card-background, white);border-radius:var(--radius-lg);padding:2rem;box-shadow:0 4px 6px #0000001a;margin-bottom:2rem}.card h2{margin-top:0;color:var(--text-dark, #333)}.card p{color:var(--text-muted, #666);line-height:1.6}.card ul{color:var(--text-muted, #666);line-height:1.8}.card ul li{margin-bottom:.5rem}.app-footer{margin-top:2rem;text-align:center;color:var(--text-muted, #999);font-size:.9rem}@media(max-width:768px){.app-container{padding:1rem}.app-header h1{font-size:2rem}.subtitle{font-size:1rem}.card{padding:1.5rem}}