:root{--bg: #12121a;--panel: #1c1c28;--text: #ececf1;--muted: #8b8b9e;--accent: #5b8cff;--bubble-me: #2b4c8c;--bubble-them: #26263a;color-scheme:dark}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,sans-serif;background:var(--bg);color:var(--text)}.app-shell{max-width:720px;margin:0 auto;min-height:100dvh;display:flex;flex-direction:column}button{font:inherit}input,textarea{font:inherit;background:var(--panel);color:var(--text);border:1px solid #333;border-radius:8px;padding:10px}