:root{--bg-primary:#0a0b10;--bg-sidebar:#12141d;--bg-chat:#161824;--bg-input:#1f2233;--border-color:rgba(255,255,255,0.08);--accent-purple:#7c3aed;--accent-blue:#3b82f6;--text-main:#f3f4f6;--text-muted:#9ca3af}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-primary);color:var(--text-main);font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;height:100vh;overflow:hidden}.chat-container{display:flex;height:100vh;width:100vw}.sidebar{width:320px;background:var(--bg-sidebar);border-right:1px solid var(--border-color);display:flex;flex-direction:column}.chat-main{flex:1 1;display:flex;flex-direction:column;background:var(--bg-chat)}.message-bubble{max-width:65%;padding:12px 16px;border-radius:16px;font-size:14px;line-height:1.5;margin-bottom:8px}.message-mine{background:linear-gradient(135deg,#7c3aed,#4c1d95);color:white;align-self:flex-end;border-bottom-right-radius:4px}.message-other{background:var(--bg-input);color:var(--text-main);align-self:flex-start;border-bottom-left-radius:4px}