:root{--bg-color: #f8fafc;--bg-card: #ffffff;--bg-input: #f1f5f9;--text-main: #0f172a;--text-muted: #64748b;--border-color: #f1f5f9;--accent-color: #2563eb;--accent-light: #eff6ff;--bubble-mine: #2563eb;--bubble-other: #ffffff;--bubble-text-mine: #ffffff;--bubble-text-other: #0f172a;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .1), 0 2px 4px -1px rgba(0, 0, 0, .06)}[data-theme=dark]{--bg-color: #121212;--bg-card: #1e1e1e;--bg-input: #2d2d2d;--text-main: #e0e0e0;--text-muted: #94a3b8;--border-color: #334155;--accent-color: #3b82f6;--accent-light: #1e293b;--bubble-mine: #3b82f6;--bubble-other: #2d2d2d;--bubble-text-mine: #ffffff;--bubble-text-other: #e0e0e0;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .3);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .4), 0 2px 4px -1px rgba(0, 0, 0, .2)}*{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background-color:var(--bg-color);color:var(--text-main);transition:background-color .3s ease,color .3s ease;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}img{max-width:100%;height:auto}[data-theme=dark] img{border:1px solid var(--border-color)}