:root{color-scheme:light dark;font-family:system-ui,-apple-system,sans-serif;line-height:1.5}body{margin:0;padding:0;background:#fafafa;color:#222}.container{max-width:900px;margin:0 auto;padding:24px}.card{background:#fff;border:1px solid #e5e5e5;border-radius:8px;padding:16px;margin-bottom:12px}.btn{background:#1f6feb;color:#fff;border:none;border-radius:6px;padding:8px 14px;cursor:pointer}.btn:disabled{opacity:.5;cursor:not-allowed}.message{border-left:3px solid #ddd;padding:8px 12px;margin:8px 0;background:#fff;border-radius:4px}.message.user{border-color:#1f6feb}.message.moderator{border-color:#9b59b6}.message.specialist{border-color:#27ae60}input,select,textarea{width:100%;padding:8px;border:1px solid #ccc;border-radius:4px;box-sizing:border-box;margin-bottom:8px}