:root{--bg: #f9f9f9;--fg: #1a1a1a;--accent: #007aff;--accent-hover: #006ee6;--border-color: #e0e0e0;--shadow-color: rgba(0, 0, 0, .05);--user-msg-bg: #e7f5ff;--ai-msg-bg: #ffffff;--error: #f44336;--success: #4caf50;--warning: #ff9800;--warning-hover: #e65100;--spacing-xs: .25rem;--spacing-sm: .5rem;--spacing-md: 1rem;--spacing-lg: 1.5rem;--spacing-xl: 2rem;--border-radius-sm: .25rem;--border-radius-md: .75rem;--border-radius-lg: 1.5rem}[data-theme=dark]{--bg: #0d1117;--fg: #c9d1d9;--accent: #58a6ff;--accent-hover: #3e92ff;--border-color: #30363d;--shadow-color: rgba(0, 0, 0, .4);--user-msg-bg: #1f6feb;--ai-msg-bg: #161b22}@keyframes fade-in{0%{opacity:0}to{opacity:1}}@keyframes slide-up{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}*{box-sizing:border-box;margin:0;padding:0}html,body{height:100%;font-family:Roboto,Segoe UI,sans-serif;font-size:16px;line-height:1.5;background-color:var(--bg);color:var(--fg)}h1,h2,h3,h4,h5,h6{margin-bottom:.5em;font-weight:500;line-height:1.2}p{margin-bottom:1rem}.text-center{text-align:center}.mt-1{margin-top:var(--spacing-sm)}.mt-2{margin-top:var(--spacing-md)}.mt-3{margin-top:var(--spacing-lg)}.mb-1{margin-bottom:var(--spacing-sm)}.mb-2{margin-bottom:var(--spacing-md)}.mb-3{margin-bottom:var(--spacing-lg)}